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code / edge / openjdk / jdk8u111-b14 / . / hotspot / src / share / vm / classfile / classFileParser.cpp
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/*
* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "classfile/classFileParser.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderData.hpp"
#include "classfile/classLoaderData.inline.hpp"
#include "classfile/defaultMethods.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#if INCLUDE_CDS
#include "classfile/systemDictionaryShared.hpp"
#endif
#include "classfile/verificationType.hpp"
#include "classfile/verifier.hpp"
#include "classfile/vmSymbols.hpp"
#include "memory/allocation.hpp"
#include "memory/gcLocker.hpp"
#include "memory/metadataFactory.hpp"
#include "memory/oopFactory.hpp"
#include "memory/referenceType.hpp"
#include "memory/universe.inline.hpp"
#include "oops/constantPool.hpp"
#include "oops/fieldStreams.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/instanceMirrorKlass.hpp"
#include "oops/klass.inline.hpp"
#include "oops/klassVtable.hpp"
#include "oops/method.hpp"
#include "oops/symbol.hpp"
#include "prims/jvm.h"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/perfData.hpp"
#include "runtime/reflection.hpp"
#include "runtime/signature.hpp"
#include "runtime/timer.hpp"
#include "services/classLoadingService.hpp"
#include "services/threadService.hpp"
#include "utilities/array.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/ostream.hpp"
// We generally try to create the oops directly when parsing, rather than
// allocating temporary data structures and copying the bytes twice. A
// temporary area is only needed when parsing utf8 entries in the constant
// pool and when parsing line number tables.
// We add assert in debug mode when class format is not checked.
#define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
#define JAVA_MIN_SUPPORTED_VERSION 45
#define JAVA_MAX_SUPPORTED_VERSION 52
#define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
// Used for two backward compatibility reasons:
// - to check for new additions to the class file format in JDK1.5
// - to check for bug fixes in the format checker in JDK1.5
#define JAVA_1_5_VERSION 49
// Used for backward compatibility reasons:
// - to check for javac bug fixes that happened after 1.5
// - also used as the max version when running in jdk6
#define JAVA_6_VERSION 50
// Used for backward compatibility reasons:
// - to check NameAndType_info signatures more aggressively
#define JAVA_7_VERSION 51
// Extension method support.
#define JAVA_8_VERSION 52
void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
// Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
// this function (_current can be allocated in a register, with scalar
// replacement of aggregates). The _current pointer is copied back to
// stream() when this function returns. DON'T call another method within
// this method that uses stream().
ClassFileStream* cfs0 = stream();
ClassFileStream cfs1 = *cfs0;
ClassFileStream* cfs = &cfs1;
#ifdef ASSERT
assert(cfs->allocated_on_stack(),"should be local");
u1* old_current = cfs0->current();
#endif
Handle class_loader(THREAD, _loader_data->class_loader());
// Used for batching symbol allocations.
const char* names[SymbolTable::symbol_alloc_batch_size];
int lengths[SymbolTable::symbol_alloc_batch_size];
int indices[SymbolTable::symbol_alloc_batch_size];
unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
int names_count = 0;
// parsing Index 0 is unused
for (int index = 1; index < length; index++) {
// Each of the following case guarantees one more byte in the stream
// for the following tag or the access_flags following constant pool,
// so we don't need bounds-check for reading tag.
u1 tag = cfs->get_u1_fast();
switch (tag) {
case JVM_CONSTANT_Class :
{
cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
u2 name_index = cfs->get_u2_fast();
_cp->klass_index_at_put(index, name_index);
}
break;
case JVM_CONSTANT_Fieldref :
{
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
u2 class_index = cfs->get_u2_fast();
u2 name_and_type_index = cfs->get_u2_fast();
_cp->field_at_put(index, class_index, name_and_type_index);
}
break;
case JVM_CONSTANT_Methodref :
{
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
u2 class_index = cfs->get_u2_fast();
u2 name_and_type_index = cfs->get_u2_fast();
_cp->method_at_put(index, class_index, name_and_type_index);
}
break;
case JVM_CONSTANT_InterfaceMethodref :
{
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
u2 class_index = cfs->get_u2_fast();
u2 name_and_type_index = cfs->get_u2_fast();
_cp->interface_method_at_put(index, class_index, name_and_type_index);
}
break;
case JVM_CONSTANT_String :
{
cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
u2 string_index = cfs->get_u2_fast();
_cp->string_index_at_put(index, string_index);
}
break;
case JVM_CONSTANT_MethodHandle :
case JVM_CONSTANT_MethodType :
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, CHECK);
}
if (!EnableInvokeDynamic) {
classfile_parse_error(
"This JVM does not support constant tag %u in class file %s",
tag, CHECK);
}
if (tag == JVM_CONSTANT_MethodHandle) {
cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
u1 ref_kind = cfs->get_u1_fast();
u2 method_index = cfs->get_u2_fast();
_cp->method_handle_index_at_put(index, ref_kind, method_index);
} else if (tag == JVM_CONSTANT_MethodType) {
cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
u2 signature_index = cfs->get_u2_fast();
_cp->method_type_index_at_put(index, signature_index);
} else {
ShouldNotReachHere();
}
break;
case JVM_CONSTANT_InvokeDynamic :
{
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, CHECK);
}
if (!EnableInvokeDynamic) {
classfile_parse_error(
"This JVM does not support constant tag %u in class file %s",
tag, CHECK);
}
cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
u2 bootstrap_specifier_index = cfs->get_u2_fast();
u2 name_and_type_index = cfs->get_u2_fast();
if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
_max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
_cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
}
break;
case JVM_CONSTANT_Integer :
{
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
u4 bytes = cfs->get_u4_fast();
_cp->int_at_put(index, (jint) bytes);
}
break;
case JVM_CONSTANT_Float :
{
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
u4 bytes = cfs->get_u4_fast();
_cp->float_at_put(index, *(jfloat*)&bytes);
}
break;
case JVM_CONSTANT_Long :
// A mangled type might cause you to overrun allocated memory
guarantee_property(index+1 < length,
"Invalid constant pool entry %u in class file %s",
index, CHECK);
{
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
u8 bytes = cfs->get_u8_fast();
_cp->long_at_put(index, bytes);
}
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
case JVM_CONSTANT_Double :
// A mangled type might cause you to overrun allocated memory
guarantee_property(index+1 < length,
"Invalid constant pool entry %u in class file %s",
index, CHECK);
{
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
u8 bytes = cfs->get_u8_fast();
_cp->double_at_put(index, *(jdouble*)&bytes);
}
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
case JVM_CONSTANT_NameAndType :
{
cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
u2 name_index = cfs->get_u2_fast();
u2 signature_index = cfs->get_u2_fast();
_cp->name_and_type_at_put(index, name_index, signature_index);
}
break;
case JVM_CONSTANT_Utf8 :
{
cfs->guarantee_more(2, CHECK); // utf8_length
u2 utf8_length = cfs->get_u2_fast();
u1* utf8_buffer = cfs->get_u1_buffer();
assert(utf8_buffer != NULL, "null utf8 buffer");
// Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
cfs->skip_u1_fast(utf8_length);
// Before storing the symbol, make sure it's legal
if (_need_verify) {
verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
}
if (EnableInvokeDynamic && has_cp_patch_at(index)) {
Handle patch = clear_cp_patch_at(index);
guarantee_property(java_lang_String::is_instance(patch()),
"Illegal utf8 patch at %d in class file %s",
index, CHECK);
char* str = java_lang_String::as_utf8_string(patch());
// (could use java_lang_String::as_symbol instead, but might as well batch them)
utf8_buffer = (u1*) str;
utf8_length = (int) strlen(str);
}
unsigned int hash;
Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
if (result == NULL) {
names[names_count] = (char*)utf8_buffer;
lengths[names_count] = utf8_length;
indices[names_count] = index;
hashValues[names_count++] = hash;
if (names_count == SymbolTable::symbol_alloc_batch_size) {
SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
names_count = 0;
}
} else {
_cp->symbol_at_put(index, result);
}
}
break;
default:
classfile_parse_error(
"Unknown constant tag %u in class file %s", tag, CHECK);
break;
}
}
// Allocate the remaining symbols
if (names_count > 0) {
SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
}
// Copy _current pointer of local copy back to stream().
#ifdef ASSERT
assert(cfs0->current() == old_current, "non-exclusive use of stream()");
#endif
cfs0->set_current(cfs1.current());
}
bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
return cp->symbol_at(index);
else
return NULL;
}
constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
ClassFileStream* cfs = stream();
constantPoolHandle nullHandle;
cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
u2 length = cfs->get_u2_fast();
guarantee_property(
length >= 1, "Illegal constant pool size %u in class file %s",
length, CHECK_(nullHandle));
ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
CHECK_(nullHandle));
_cp = constant_pool; // save in case of errors
constantPoolHandle cp (THREAD, constant_pool);
// parsing constant pool entries
parse_constant_pool_entries(length, CHECK_(nullHandle));
int index = 1; // declared outside of loops for portability
// first verification pass - validate cross references and fixup class and string constants
for (index = 1; index < length; index++) { // Index 0 is unused
jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_Class :
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
case JVM_CONSTANT_Fieldref :
// fall through
case JVM_CONSTANT_Methodref :
// fall through
case JVM_CONSTANT_InterfaceMethodref : {
if (!_need_verify) break;
int klass_ref_index = cp->klass_ref_index_at(index);
int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
check_property(valid_klass_reference_at(klass_ref_index),
"Invalid constant pool index %u in class file %s",
klass_ref_index,
CHECK_(nullHandle));
check_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index,
CHECK_(nullHandle));
break;
}
case JVM_CONSTANT_String :
ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
break;
case JVM_CONSTANT_Integer :
break;
case JVM_CONSTANT_Float :
break;
case JVM_CONSTANT_Long :
case JVM_CONSTANT_Double :
index++;
check_property(
(index < length && cp->tag_at(index).is_invalid()),
"Improper constant pool long/double index %u in class file %s",
index, CHECK_(nullHandle));
break;
case JVM_CONSTANT_NameAndType : {
if (!_need_verify) break;
int name_ref_index = cp->name_ref_index_at(index);
int signature_ref_index = cp->signature_ref_index_at(index);
check_property(valid_symbol_at(name_ref_index),
"Invalid constant pool index %u in class file %s",
name_ref_index, CHECK_(nullHandle));
check_property(valid_symbol_at(signature_ref_index),
"Invalid constant pool index %u in class file %s",
signature_ref_index, CHECK_(nullHandle));
break;
}
case JVM_CONSTANT_Utf8 :
break;
case JVM_CONSTANT_UnresolvedClass : // fall-through
case JVM_CONSTANT_UnresolvedClassInError:
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
case JVM_CONSTANT_ClassIndex :
{
int class_index = cp->klass_index_at(index);
check_property(valid_symbol_at(class_index),
"Invalid constant pool index %u in class file %s",
class_index, CHECK_(nullHandle));
cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
}
break;
case JVM_CONSTANT_StringIndex :
{
int string_index = cp->string_index_at(index);
check_property(valid_symbol_at(string_index),
"Invalid constant pool index %u in class file %s",
string_index, CHECK_(nullHandle));
Symbol* sym = cp->symbol_at(string_index);
cp->unresolved_string_at_put(index, sym);
}
break;
case JVM_CONSTANT_MethodHandle :
{
int ref_index = cp->method_handle_index_at(index);
check_property(
valid_cp_range(ref_index, length) &&
EnableInvokeDynamic,
"Invalid constant pool index %u in class file %s",
ref_index, CHECK_(nullHandle));
constantTag tag = cp->tag_at(ref_index);
int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_getField:
case JVM_REF_getStatic:
case JVM_REF_putField:
case JVM_REF_putStatic:
check_property(
tag.is_field(),
"Invalid constant pool index %u in class file %s (not a field)",
ref_index, CHECK_(nullHandle));
break;
case JVM_REF_invokeVirtual:
case JVM_REF_newInvokeSpecial:
check_property(
tag.is_method(),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK_(nullHandle));
break;
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial:
check_property(tag.is_method() ||
((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK_(nullHandle));
break;
case JVM_REF_invokeInterface:
check_property(
tag.is_interface_method(),
"Invalid constant pool index %u in class file %s (not an interface method)",
ref_index, CHECK_(nullHandle));
break;
default:
classfile_parse_error(
"Bad method handle kind at constant pool index %u in class file %s",
index, CHECK_(nullHandle));
}
// Keep the ref_index unchanged. It will be indirected at link-time.
}
break;
case JVM_CONSTANT_MethodType :
{
int ref_index = cp->method_type_index_at(index);
check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
"Invalid constant pool index %u in class file %s",
ref_index, CHECK_(nullHandle));
}
break;
case JVM_CONSTANT_InvokeDynamic :
{
int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
check_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index,
CHECK_(nullHandle));
// bootstrap specifier index must be checked later, when BootstrapMethods attr is available
break;
}
default:
fatal(err_msg("bad constant pool tag value %u",
cp->tag_at(index).value()));
ShouldNotReachHere();
break;
} // end of switch
} // end of for
if (_cp_patches != NULL) {
// need to treat this_class specially...
assert(EnableInvokeDynamic, "");
int this_class_index;
{
cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
u1* mark = cfs->current();
u2 flags = cfs->get_u2_fast();
this_class_index = cfs->get_u2_fast();
cfs->set_current(mark); // revert to mark
}
for (index = 1; index < length; index++) { // Index 0 is unused
if (has_cp_patch_at(index)) {
guarantee_property(index != this_class_index,
"Illegal constant pool patch to self at %d in class file %s",
index, CHECK_(nullHandle));
patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
}
}
}
if (!_need_verify) {
return cp;
}
// second verification pass - checks the strings are of the right format.
// but not yet to the other entries
for (index = 1; index < length; index++) {
jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_UnresolvedClass: {
Symbol* class_name = cp->unresolved_klass_at(index);
// check the name, even if _cp_patches will overwrite it
verify_legal_class_name(class_name, CHECK_(nullHandle));
break;
}
case JVM_CONSTANT_NameAndType: {
if (_need_verify && _major_version >= JAVA_7_VERSION) {
int sig_index = cp->signature_ref_index_at(index);
int name_index = cp->name_ref_index_at(index);
Symbol* name = cp->symbol_at(name_index);
Symbol* sig = cp->symbol_at(sig_index);
if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
verify_legal_method_signature(name, sig, CHECK_(nullHandle));
} else {
verify_legal_field_signature(name, sig, CHECK_(nullHandle));
}
}
break;
}
case JVM_CONSTANT_InvokeDynamic:
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref: {
int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
// already verified to be utf8
int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
// already verified to be utf8
int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
Symbol* name = cp->symbol_at(name_ref_index);
Symbol* signature = cp->symbol_at(signature_ref_index);
if (tag == JVM_CONSTANT_Fieldref) {
verify_legal_field_name(name, CHECK_(nullHandle));
if (_need_verify && _major_version >= JAVA_7_VERSION) {
// Signature is verified above, when iterating NameAndType_info.
// Need only to be sure it's the right type.
if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
throwIllegalSignature(
"Field", name, signature, CHECK_(nullHandle));
}
} else {
verify_legal_field_signature(name, signature, CHECK_(nullHandle));
}
} else {
verify_legal_method_name(name, CHECK_(nullHandle));
if (_need_verify && _major_version >= JAVA_7_VERSION) {
// Signature is verified above, when iterating NameAndType_info.
// Need only to be sure it's the right type.
if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
throwIllegalSignature(
"Method", name, signature, CHECK_(nullHandle));
}
} else {
verify_legal_method_signature(name, signature, CHECK_(nullHandle));
}
if (tag == JVM_CONSTANT_Methodref) {
// 4509014: If a class method name begins with '<', it must be "<init>".
assert(name != NULL, "method name in constant pool is null");
unsigned int name_len = name->utf8_length();
assert(name_len > 0, "bad method name"); // already verified as legal name
if (name->byte_at(0) == '<') {
if (name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, CHECK_(nullHandle));
}
}
}
}
break;
}
case JVM_CONSTANT_MethodHandle: {
int ref_index = cp->method_handle_index_at(index);
int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_invokeVirtual:
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial:
case JVM_REF_newInvokeSpecial:
{
int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
Symbol* name = cp->symbol_at(name_ref_index);
if (ref_kind == JVM_REF_newInvokeSpecial) {
if (name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad constructor name at constant pool index %u in class file %s",
name_ref_index, CHECK_(nullHandle));
}
} else {
if (name == vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, CHECK_(nullHandle));
}
}
}
break;
// Other ref_kinds are already fully checked in previous pass.
}
break;
}
case JVM_CONSTANT_MethodType: {
Symbol* no_name = vmSymbols::type_name(); // place holder
Symbol* signature = cp->method_type_signature_at(index);
verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
break;
}
case JVM_CONSTANT_Utf8: {
assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
}
} // end of switch
} // end of for
return cp;
}
void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
assert(EnableInvokeDynamic, "");
BasicType patch_type = T_VOID;
switch (cp->tag_at(index).value()) {
case JVM_CONSTANT_UnresolvedClass :
// Patching a class means pre-resolving it.
// The name in the constant pool is ignored.
if (java_lang_Class::is_instance(patch())) {
guarantee_property(!java_lang_Class::is_primitive(patch()),
"Illegal class patch at %d in class file %s",
index, CHECK);
cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
} else {
guarantee_property(java_lang_String::is_instance(patch()),
"Illegal class patch at %d in class file %s",
index, CHECK);
Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
cp->unresolved_klass_at_put(index, name);
}
break;
case JVM_CONSTANT_String :
// skip this patch and don't clear it. Needs the oop array for resolved
// references to be created first.
return;
case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim;
case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim;
case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim;
case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim;
patch_prim:
{
jvalue value;
BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
guarantee_property(value_type == patch_type,
"Illegal primitive patch at %d in class file %s",
index, CHECK);
switch (value_type) {
case T_INT: cp->int_at_put(index, value.i); break;
case T_FLOAT: cp->float_at_put(index, value.f); break;
case T_LONG: cp->long_at_put(index, value.j); break;
case T_DOUBLE: cp->double_at_put(index, value.d); break;
default: assert(false, "");
}
}
break;
default:
// %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
guarantee_property(!has_cp_patch_at(index),
"Illegal unexpected patch at %d in class file %s",
index, CHECK);
return;
}
// On fall-through, mark the patch as used.
clear_cp_patch_at(index);
}
class NameSigHash: public ResourceObj {
public:
Symbol* _name; // name
Symbol* _sig; // signature
NameSigHash* _next; // Next entry in hash table
};
#define HASH_ROW_SIZE 256
unsigned int hash(Symbol* name, Symbol* sig) {
unsigned int raw_hash = 0;
raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
}
void initialize_hashtable(NameSigHash** table) {
memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
}
// Return false if the name/sig combination is found in table.
// Return true if no duplicate is found. And name/sig is added as a new entry in table.
// The old format checker uses heap sort to find duplicates.
// NOTE: caller should guarantee that GC doesn't happen during the life cycle
// of table since we don't expect Symbol*'s to move.
bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
assert(name != NULL, "name in constant pool is NULL");
// First lookup for duplicates
int index = hash(name, sig);
NameSigHash* entry = table[index];
while (entry != NULL) {
if (entry->_name == name && entry->_sig == sig) {
return false;
}
entry = entry->_next;
}
// No duplicate is found, allocate a new entry and fill it.
entry = new NameSigHash();
entry->_name = name;
entry->_sig = sig;
// Insert into hash table
entry->_next = table[index];
table[index] = entry;
return true;
}
Array<Klass*>* ClassFileParser::parse_interfaces(int length,
Handle protection_domain,
Symbol* class_name,
bool* has_default_methods,
TRAPS) {
if (length == 0) {
_local_interfaces = Universe::the_empty_klass_array();
} else {
ClassFileStream* cfs = stream();
assert(length > 0, "only called for length>0");
_local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
int index;
for (index = 0; index < length; index++) {
u2 interface_index = cfs->get_u2(CHECK_NULL);
KlassHandle interf;
check_property(
valid_klass_reference_at(interface_index),
"Interface name has bad constant pool index %u in class file %s",
interface_index, CHECK_NULL);
if (_cp->tag_at(interface_index).is_klass()) {
interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
} else {
Symbol* unresolved_klass = _cp->klass_name_at(interface_index);
// Don't need to check legal name because it's checked when parsing constant pool.
// But need to make sure it's not an array type.
guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
"Bad interface name in class file %s", CHECK_NULL);
Handle class_loader(THREAD, _loader_data->class_loader());
// Call resolve_super so classcircularity is checked
Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
unresolved_klass, class_loader, protection_domain,
false, CHECK_NULL);
interf = KlassHandle(THREAD, k);
}
if (!interf()->is_interface()) {
THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
}
if (InstanceKlass::cast(interf())->has_default_methods()) {
*has_default_methods = true;
}
_local_interfaces->at_put(index, interf());
}
if (!_need_verify || length <= 1) {
return _local_interfaces;
}
// Check if there's any duplicates in interfaces
ResourceMark rm(THREAD);
NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, NameSigHash*, HASH_ROW_SIZE);
initialize_hashtable(interface_names);
bool dup = false;
{
debug_only(No_Safepoint_Verifier nsv;)
for (index = 0; index < length; index++) {
Klass* k = _local_interfaces->at(index);
Symbol* name = InstanceKlass::cast(k)->name();
// If no duplicates, add (name, NULL) in hashtable interface_names.
if (!put_after_lookup(name, NULL, interface_names)) {
dup = true;
break;
}
}
}
if (dup) {
classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
}
}
return _local_interfaces;
}
void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
// Make sure the constant pool entry is of a type appropriate to this field
guarantee_property(
(constantvalue_index > 0 &&
constantvalue_index < _cp->length()),
"Bad initial value index %u in ConstantValue attribute in class file %s",
constantvalue_index, CHECK);
constantTag value_type = _cp->tag_at(constantvalue_index);
switch ( _cp->basic_type_for_signature_at(signature_index) ) {
case T_LONG:
guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
break;
case T_FLOAT:
guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
break;
case T_DOUBLE:
guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
break;
case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
break;
case T_OBJECT:
guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
&& value_type.is_string()),
"Bad string initial value in class file %s", CHECK);
break;
default:
classfile_parse_error(
"Unable to set initial value %u in class file %s",
constantvalue_index, CHECK);
}
}
// Parse attributes for a field.
void ClassFileParser::parse_field_attributes(u2 attributes_count,
bool is_static, u2 signature_index,
u2* constantvalue_index_addr,
bool* is_synthetic_addr,
u2* generic_signature_index_addr,
ClassFileParser::FieldAnnotationCollector* parsed_annotations,
TRAPS) {
ClassFileStream* cfs = stream();
assert(attributes_count > 0, "length should be greater than 0");
u2 constantvalue_index = 0;
u2 generic_signature_index = 0;
bool is_synthetic = false;
u1* runtime_visible_annotations = NULL;
int runtime_visible_annotations_length = 0;
u1* runtime_invisible_annotations = NULL;
int runtime_invisible_annotations_length = 0;
u1* runtime_visible_type_annotations = NULL;
int runtime_visible_type_annotations_length = 0;
u1* runtime_invisible_type_annotations = NULL;
int runtime_invisible_type_annotations_length = 0;
bool runtime_invisible_type_annotations_exists = false;
while (attributes_count--) {
cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
u2 attribute_name_index = cfs->get_u2_fast();
u4 attribute_length = cfs->get_u4_fast();
check_property(valid_symbol_at(attribute_name_index),
"Invalid field attribute index %u in class file %s",
attribute_name_index,
CHECK);
Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
// ignore if non-static
if (constantvalue_index != 0) {
classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
}
check_property(
attribute_length == 2,
"Invalid ConstantValue field attribute length %u in class file %s",
attribute_length, CHECK);
constantvalue_index = cfs->get_u2(CHECK);
if (_need_verify) {
verify_constantvalue(constantvalue_index, signature_index, CHECK);
}
} else if (attribute_name == vmSymbols::tag_synthetic()) {
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic field attribute length %u in class file %s",
attribute_length, CHECK);
}
is_synthetic = true;
} else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated field attribute length %u in class file %s",
attribute_length, CHECK);
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (attribute_name == vmSymbols::tag_signature()) {
if (attribute_length != 2) {
classfile_parse_error(
"Wrong size %u for field's Signature attribute in class file %s",
attribute_length, CHECK);
}
generic_signature_index = parse_generic_signature_attribute(CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
parsed_annotations,
CHECK);
cfs->skip_u1(runtime_visible_annotations_length, CHECK);
} else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
runtime_invisible_annotations_length = attribute_length;
runtime_invisible_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_annotations != NULL, "null invisible annotations");
cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
}
runtime_visible_type_annotations_length = attribute_length;
runtime_visible_type_annotations = cfs->get_u1_buffer();
assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
} else {
runtime_invisible_type_annotations_exists = true;
}
if (PreserveAllAnnotations) {
runtime_invisible_type_annotations_length = attribute_length;
runtime_invisible_type_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
}
cfs->skip_u1(attribute_length, CHECK);
} else {
cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
}
} else {
cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
}
}
*constantvalue_index_addr = constantvalue_index;
*is_synthetic_addr = is_synthetic;
*generic_signature_index_addr = generic_signature_index;
AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
CHECK);
parsed_annotations->set_field_annotations(a);
a = assemble_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
CHECK);
parsed_annotations->set_field_type_annotations(a);
return;
}
// Field allocation types. Used for computing field offsets.
enum FieldAllocationType {
STATIC_OOP, // Oops
STATIC_BYTE, // Boolean, Byte, char
STATIC_SHORT, // shorts
STATIC_WORD, // ints
STATIC_DOUBLE, // aligned long or double
NONSTATIC_OOP,
NONSTATIC_BYTE,
NONSTATIC_SHORT,
NONSTATIC_WORD,
NONSTATIC_DOUBLE,
MAX_FIELD_ALLOCATION_TYPE,
BAD_ALLOCATION_TYPE = -1
};
static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
BAD_ALLOCATION_TYPE, // 0
BAD_ALLOCATION_TYPE, // 1
BAD_ALLOCATION_TYPE, // 2
BAD_ALLOCATION_TYPE, // 3
NONSTATIC_BYTE , // T_BOOLEAN = 4,
NONSTATIC_SHORT, // T_CHAR = 5,
NONSTATIC_WORD, // T_FLOAT = 6,
NONSTATIC_DOUBLE, // T_DOUBLE = 7,
NONSTATIC_BYTE, // T_BYTE = 8,
NONSTATIC_SHORT, // T_SHORT = 9,
NONSTATIC_WORD, // T_INT = 10,
NONSTATIC_DOUBLE, // T_LONG = 11,
NONSTATIC_OOP, // T_OBJECT = 12,
NONSTATIC_OOP, // T_ARRAY = 13,
BAD_ALLOCATION_TYPE, // T_VOID = 14,
BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
BAD_ALLOCATION_TYPE, // T_METADATA = 17,
BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
BAD_ALLOCATION_TYPE, // 0
BAD_ALLOCATION_TYPE, // 1
BAD_ALLOCATION_TYPE, // 2
BAD_ALLOCATION_TYPE, // 3
STATIC_BYTE , // T_BOOLEAN = 4,
STATIC_SHORT, // T_CHAR = 5,
STATIC_WORD, // T_FLOAT = 6,
STATIC_DOUBLE, // T_DOUBLE = 7,
STATIC_BYTE, // T_BYTE = 8,
STATIC_SHORT, // T_SHORT = 9,
STATIC_WORD, // T_INT = 10,
STATIC_DOUBLE, // T_LONG = 11,
STATIC_OOP, // T_OBJECT = 12,
STATIC_OOP, // T_ARRAY = 13,
BAD_ALLOCATION_TYPE, // T_VOID = 14,
BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
BAD_ALLOCATION_TYPE, // T_METADATA = 17,
BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
};
static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
assert(result != BAD_ALLOCATION_TYPE, "bad type");
return result;
}
class FieldAllocationCount: public ResourceObj {
public:
u2 count[MAX_FIELD_ALLOCATION_TYPE];
FieldAllocationCount() {
for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
count[i] = 0;
}
}
FieldAllocationType update(bool is_static, BasicType type) {
FieldAllocationType atype = basic_type_to_atype(is_static, type);
// Make sure there is no overflow with injected fields.
assert(count[atype] < 0xFFFF, "More than 65535 fields");
count[atype]++;
return atype;
}
};
Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
bool is_interface,
FieldAllocationCount *fac,
u2* java_fields_count_ptr, TRAPS) {
ClassFileStream* cfs = stream();
cfs->guarantee_more(2, CHECK_NULL); // length
u2 length = cfs->get_u2_fast();
*java_fields_count_ptr = length;
int num_injected = 0;
InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
int total_fields = length + num_injected;
// The field array starts with tuples of shorts
// [access, name index, sig index, initial value index, byte offset].
// A generic signature slot only exists for field with generic
// signature attribute. And the access flag is set with
// JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
// signature slots are at the end of the field array and after all
// other fields data.
//
// f1: [access, name index, sig index, initial value index, low_offset, high_offset]
// f2: [access, name index, sig index, initial value index, low_offset, high_offset]
// ...
// fn: [access, name index, sig index, initial value index, low_offset, high_offset]
// [generic signature index]
// [generic signature index]
// ...
//
// Allocate a temporary resource array for field data. For each field,
// a slot is reserved in the temporary array for the generic signature
// index. After parsing all fields, the data are copied to a permanent
// array and any unused slots will be discarded.
ResourceMark rm(THREAD);
u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
// The generic signature slots start after all other fields' data.
int generic_signature_slot = total_fields * FieldInfo::field_slots;
int num_generic_signature = 0;
for (int n = 0; n < length; n++) {
cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count
AccessFlags access_flags;
jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
access_flags.set_flags(flags);
u2 name_index = cfs->get_u2_fast();
int cp_size = _cp->length();
check_property(valid_symbol_at(name_index),
"Invalid constant pool index %u for field name in class file %s",
name_index,
CHECK_NULL);
Symbol* name = _cp->symbol_at(name_index);
verify_legal_field_name(name, CHECK_NULL);
u2 signature_index = cfs->get_u2_fast();
check_property(valid_symbol_at(signature_index),
"Invalid constant pool index %u for field signature in class file %s",
signature_index, CHECK_NULL);
Symbol* sig = _cp->symbol_at(signature_index);
verify_legal_field_signature(name, sig, CHECK_NULL);
u2 constantvalue_index = 0;
bool is_synthetic = false;
u2 generic_signature_index = 0;
bool is_static = access_flags.is_static();
FieldAnnotationCollector parsed_annotations(_loader_data);
u2 attributes_count = cfs->get_u2_fast();
if (attributes_count > 0) {
parse_field_attributes(attributes_count, is_static, signature_index,
&constantvalue_index, &is_synthetic,
&generic_signature_index, &parsed_annotations,
CHECK_NULL);
if (parsed_annotations.field_annotations() != NULL) {
if (_fields_annotations == NULL) {
_fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
_loader_data, length, NULL,
CHECK_NULL);
}
_fields_annotations->at_put(n, parsed_annotations.field_annotations());
parsed_annotations.set_field_annotations(NULL);
}
if (parsed_annotations.field_type_annotations() != NULL) {
if (_fields_type_annotations == NULL) {
_fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
_loader_data, length, NULL,
CHECK_NULL);
}
_fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
parsed_annotations.set_field_type_annotations(NULL);
}
if (is_synthetic) {
access_flags.set_is_synthetic();
}
if (generic_signature_index != 0) {
access_flags.set_field_has_generic_signature();
fa[generic_signature_slot] = generic_signature_index;
generic_signature_slot ++;
num_generic_signature ++;
}
}
FieldInfo* field = FieldInfo::from_field_array(fa, n);
field->initialize(access_flags.as_short(),
name_index,
signature_index,
constantvalue_index);
BasicType type = _cp->basic_type_for_signature_at(signature_index);
// Remember how many oops we encountered and compute allocation type
FieldAllocationType atype = fac->update(is_static, type);
field->set_allocation_type(atype);
// After field is initialized with type, we can augment it with aux info
if (parsed_annotations.has_any_annotations())
parsed_annotations.apply_to(field);
}
int index = length;
if (num_injected != 0) {
for (int n = 0; n < num_injected; n++) {
// Check for duplicates
if (injected[n].may_be_java) {
Symbol* name = injected[n].name();
Symbol* signature = injected[n].signature();
bool duplicate = false;
for (int i = 0; i < length; i++) {
FieldInfo* f = FieldInfo::from_field_array(fa, i);
if (name == _cp->symbol_at(f->name_index()) &&
signature == _cp->symbol_at(f->signature_index())) {
// Symbol is desclared in Java so skip this one
duplicate = true;
break;
}
}
if (duplicate) {
// These will be removed from the field array at the end
continue;
}
}
// Injected field
FieldInfo* field = FieldInfo::from_field_array(fa, index);
field->initialize(JVM_ACC_FIELD_INTERNAL,
injected[n].name_index,
injected[n].signature_index,
0);
BasicType type = FieldType::basic_type(injected[n].signature());
// Remember how many oops we encountered and compute allocation type
FieldAllocationType atype = fac->update(false, type);
field->set_allocation_type(atype);
index++;
}
}
// Now copy the fields' data from the temporary resource array.
// Sometimes injected fields already exist in the Java source so
// the fields array could be too long. In that case the
// fields array is trimed. Also unused slots that were reserved
// for generic signature indexes are discarded.
Array<u2>* fields = MetadataFactory::new_array<u2>(
_loader_data, index * FieldInfo::field_slots + num_generic_signature,
CHECK_NULL);
_fields = fields; // save in case of error
{
int i = 0;
for (; i < index * FieldInfo::field_slots; i++) {
fields->at_put(i, fa[i]);
}
for (int j = total_fields * FieldInfo::field_slots;
j < generic_signature_slot; j++) {
fields->at_put(i++, fa[j]);
}
assert(i == fields->length(), "");
}
if (_need_verify && length > 1) {
// Check duplicated fields
ResourceMark rm(THREAD);
NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, NameSigHash*, HASH_ROW_SIZE);
initialize_hashtable(names_and_sigs);
bool dup = false;
{
debug_only(No_Safepoint_Verifier nsv;)
for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
Symbol* name = fs.name();
Symbol* sig = fs.signature();
// If no duplicates, add name/signature in hashtable names_and_sigs.
if (!put_after_lookup(name, sig, names_and_sigs)) {
dup = true;
break;
}
}
}
if (dup) {
classfile_parse_error("Duplicate field name&signature in class file %s",
CHECK_NULL);
}
}
return fields;
}
static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
while (length-- > 0) {
*dest++ = Bytes::get_Java_u2((u1*) (src++));
}
}
u2* ClassFileParser::parse_exception_table(u4 code_length,
u4 exception_table_length,
TRAPS) {
ClassFileStream* cfs = stream();
u2* exception_table_start = cfs->get_u2_buffer();
assert(exception_table_start != NULL, "null exception table");
cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
// Will check legal target after parsing code array in verifier.
if (_need_verify) {
for (unsigned int i = 0; i < exception_table_length; i++) {
u2 start_pc = cfs->get_u2_fast();
u2 end_pc = cfs->get_u2_fast();
u2 handler_pc = cfs->get_u2_fast();
u2 catch_type_index = cfs->get_u2_fast();
guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
"Illegal exception table range in class file %s",
CHECK_NULL);
guarantee_property(handler_pc < code_length,
"Illegal exception table handler in class file %s",
CHECK_NULL);
if (catch_type_index != 0) {
guarantee_property(valid_klass_reference_at(catch_type_index),
"Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
}
}
} else {
cfs->skip_u2_fast(exception_table_length * 4);
}
return exception_table_start;
}
void ClassFileParser::parse_linenumber_table(
u4 code_attribute_length, u4 code_length,
CompressedLineNumberWriteStream** write_stream, TRAPS) {
ClassFileStream* cfs = stream();
unsigned int num_entries = cfs->get_u2(CHECK);
// Each entry is a u2 start_pc, and a u2 line_number
unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
// Verify line number attribute and table length
check_property(
code_attribute_length == sizeof(u2) + length_in_bytes,
"LineNumberTable attribute has wrong length in class file %s", CHECK);
cfs->guarantee_more(length_in_bytes, CHECK);
if ((*write_stream) == NULL) {
if (length_in_bytes > fixed_buffer_size) {
(*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
} else {
(*write_stream) = new CompressedLineNumberWriteStream(
linenumbertable_buffer, fixed_buffer_size);
}
}
while (num_entries-- > 0) {
u2 bci = cfs->get_u2_fast(); // start_pc
u2 line = cfs->get_u2_fast(); // line_number
guarantee_property(bci < code_length,
"Invalid pc in LineNumberTable in class file %s", CHECK);
(*write_stream)->write_pair(bci, line);
}
}
// Class file LocalVariableTable elements.
class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
public:
u2 start_bci;
u2 length;
u2 name_cp_index;
u2 descriptor_cp_index;
u2 slot;
};
class LVT_Hash: public CHeapObj<mtClass> {
public:
LocalVariableTableElement *_elem; // element
LVT_Hash* _next; // Next entry in hash table
};
unsigned int hash(LocalVariableTableElement *elem) {
unsigned int raw_hash = elem->start_bci;
raw_hash = elem->length + raw_hash * 37;
raw_hash = elem->name_cp_index + raw_hash * 37;
raw_hash = elem->slot + raw_hash * 37;
return raw_hash % HASH_ROW_SIZE;
}
void initialize_hashtable(LVT_Hash** table) {
for (int i = 0; i < HASH_ROW_SIZE; i++) {
table[i] = NULL;
}
}
void clear_hashtable(LVT_Hash** table) {
for (int i = 0; i < HASH_ROW_SIZE; i++) {
LVT_Hash* current = table[i];
LVT_Hash* next;
while (current != NULL) {
next = current->_next;
current->_next = NULL;
delete(current);
current = next;
}
table[i] = NULL;
}
}
LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
LVT_Hash* entry = table[index];
/*
* 3-tuple start_bci/length/slot has to be unique key,
* so the following comparison seems to be redundant:
* && elem->name_cp_index == entry->_elem->name_cp_index
*/
while (entry != NULL) {
if (elem->start_bci == entry->_elem->start_bci
&& elem->length == entry->_elem->length
&& elem->name_cp_index == entry->_elem->name_cp_index
&& elem->slot == entry->_elem->slot
) {
return entry;
}
entry = entry->_next;
}
return NULL;
}
// Return false if the local variable is found in table.
// Return true if no duplicate is found.
// And local variable is added as a new entry in table.
bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
// First lookup for duplicates
int index = hash(elem);
LVT_Hash* entry = LVT_lookup(elem, index, table);
if (entry != NULL) {
return false;
}
// No duplicate is found, allocate a new entry and fill it.
if ((entry = new LVT_Hash()) == NULL) {
return false;
}
entry->_elem = elem;
// Insert into hash table
entry->_next = table[index];
table[index] = entry;
return true;
}
void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
lvt->length = Bytes::get_Java_u2((u1*) &src->length);
lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
lvt->signature_cp_index = 0;
lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
}
// Function is used to parse both attributes:
// LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
u2* ClassFileParser::parse_localvariable_table(u4 code_length,
u2 max_locals,
u4 code_attribute_length,
u2* localvariable_table_length,
bool isLVTT,
TRAPS) {
ClassFileStream* cfs = stream();
const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
*localvariable_table_length = cfs->get_u2(CHECK_NULL);
unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
// Verify local variable table attribute has right length
if (_need_verify) {
guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
"%s has wrong length in class file %s", tbl_name, CHECK_NULL);
}
u2* localvariable_table_start = cfs->get_u2_buffer();
assert(localvariable_table_start != NULL, "null local variable table");
if (!_need_verify) {
cfs->skip_u2_fast(size);
} else {
cfs->guarantee_more(size * 2, CHECK_NULL);
for(int i = 0; i < (*localvariable_table_length); i++) {
u2 start_pc = cfs->get_u2_fast();
u2 length = cfs->get_u2_fast();
u2 name_index = cfs->get_u2_fast();
u2 descriptor_index = cfs->get_u2_fast();
u2 index = cfs->get_u2_fast();
// Assign to a u4 to avoid overflow
u4 end_pc = (u4)start_pc + (u4)length;
if (start_pc >= code_length) {
classfile_parse_error(
"Invalid start_pc %u in %s in class file %s",
start_pc, tbl_name, CHECK_NULL);
}
if (end_pc > code_length) {
classfile_parse_error(
"Invalid length %u in %s in class file %s",
length, tbl_name, CHECK_NULL);
}
int cp_size = _cp->length();
guarantee_property(valid_symbol_at(name_index),
"Name index %u in %s has bad constant type in class file %s",
name_index, tbl_name, CHECK_NULL);
guarantee_property(valid_symbol_at(descriptor_index),
"Signature index %u in %s has bad constant type in class file %s",
descriptor_index, tbl_name, CHECK_NULL);
Symbol* name = _cp->symbol_at(name_index);
Symbol* sig = _cp->symbol_at(descriptor_index);
verify_legal_field_name(name, CHECK_NULL);
u2 extra_slot = 0;
if (!isLVTT) {
verify_legal_field_signature(name, sig, CHECK_NULL);
// 4894874: check special cases for double and long local variables
if (sig == vmSymbols::type_signature(T_DOUBLE) ||
sig == vmSymbols::type_signature(T_LONG)) {
extra_slot = 1;
}
}
guarantee_property((index + extra_slot) < max_locals,
"Invalid index %u in %s in class file %s",
index, tbl_name, CHECK_NULL);
}
}
return localvariable_table_start;
}
void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
u1* u1_array, u2* u2_array, TRAPS) {
ClassFileStream* cfs = stream();
u2 index = 0; // index in the array with long/double occupying two slots
u4 i1 = *u1_index;
u4 i2 = *u2_index + 1;
for(int i = 0; i < array_length; i++) {
u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
index++;
if (tag == ITEM_Long || tag == ITEM_Double) {
index++;
} else if (tag == ITEM_Object) {
u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
guarantee_property(valid_klass_reference_at(class_index),
"Bad class index %u in StackMap in class file %s",
class_index, CHECK);
} else if (tag == ITEM_Uninitialized) {
u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
guarantee_property(
offset < code_length,
"Bad uninitialized type offset %u in StackMap in class file %s",
offset, CHECK);
} else {
guarantee_property(
tag <= (u1)ITEM_Uninitialized,
"Unknown variable type %u in StackMap in class file %s",
tag, CHECK);
}
}
u2_array[*u2_index] = index;
*u1_index = i1;
*u2_index = i2;
}
u1* ClassFileParser::parse_stackmap_table(
u4 code_attribute_length, TRAPS) {
if (code_attribute_length == 0)
return NULL;
ClassFileStream* cfs = stream();
u1* stackmap_table_start = cfs->get_u1_buffer();
assert(stackmap_table_start != NULL, "null stackmap table");
// check code_attribute_length first
stream()->skip_u1(code_attribute_length, CHECK_NULL);
if (!_need_verify && !DumpSharedSpaces) {
return NULL;
}
return stackmap_table_start;
}
u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
u4 method_attribute_length,
TRAPS) {
ClassFileStream* cfs = stream();
cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
*checked_exceptions_length = cfs->get_u2_fast();
unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
u2* checked_exceptions_start = cfs->get_u2_buffer();
assert(checked_exceptions_start != NULL, "null checked exceptions");
if (!_need_verify) {
cfs->skip_u2_fast(size);
} else {
// Verify each value in the checked exception table
u2 checked_exception;
u2 len = *checked_exceptions_length;
cfs->guarantee_more(2 * len, CHECK_NULL);
for (int i = 0; i < len; i++) {
checked_exception = cfs->get_u2_fast();
check_property(
valid_klass_reference_at(checked_exception),
"Exception name has bad type at constant pool %u in class file %s",
checked_exception, CHECK_NULL);
}
}
// check exceptions attribute length
if (_need_verify) {
guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
sizeof(u2) * size),
"Exceptions attribute has wrong length in class file %s", CHECK_NULL);
}
return checked_exceptions_start;
}
void ClassFileParser::throwIllegalSignature(
const char* type, Symbol* name, Symbol* sig, TRAPS) {
ResourceMark rm(THREAD);
Exceptions::fthrow(THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"%s \"%s\" in class %s has illegal signature \"%s\"", type,
name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
}
// Skip an annotation. Return >=limit if there is any problem.
int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
// annotation := atype:u2 do(nmem:u2) {member:u2 value}
// value := switch (tag:u1) { ... }
index += 2; // skip atype
if ((index += 2) >= limit) return limit; // read nmem
int nmem = Bytes::get_Java_u2(buffer+index-2);
while (--nmem >= 0 && index < limit) {
index += 2; // skip member
index = skip_annotation_value(buffer, limit, index);
}
return index;
}
// Skip an annotation value. Return >=limit if there is any problem.
int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
// value := switch (tag:u1) {
// case B, C, I, S, Z, D, F, J, c: con:u2;
// case e: e_class:u2 e_name:u2;
// case s: s_con:u2;
// case [: do(nval:u2) {value};
// case @: annotation;
// case s: s_con:u2;
// }
if ((index += 1) >= limit) return limit; // read tag
u1 tag = buffer[index-1];
switch (tag) {
case 'B': case 'C': case 'I': case 'S': case 'Z':
case 'D': case 'F': case 'J': case 'c': case 's':
index += 2; // skip con or s_con
break;
case 'e':
index += 4; // skip e_class, e_name
break;
case '[':
{
if ((index += 2) >= limit) return limit; // read nval
int nval = Bytes::get_Java_u2(buffer+index-2);
while (--nval >= 0 && index < limit) {
index = skip_annotation_value(buffer, limit, index);
}
}
break;
case '@':
index = skip_annotation(buffer, limit, index);
break;
default:
assert(false, "annotation tag");
return limit; // bad tag byte
}
return index;
}
// Sift through annotations, looking for those significant to the VM:
void ClassFileParser::parse_annotations(u1* buffer, int limit,
ClassFileParser::AnnotationCollector* coll,
TRAPS) {
// annotations := do(nann:u2) {annotation}
int index = 0;
if ((index += 2) >= limit) return; // read nann
int nann = Bytes::get_Java_u2(buffer+index-2);
enum { // initial annotation layout
atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
count_off = 2, // u2 such as 1 (one value)
member_off = 4, // utf8 such as 'value'
tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
e_tag_val = 'e',
e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
e_size = 11, // end of 'e' annotation
c_tag_val = 'c', // payload is type
c_con_off = 7, // utf8 payload, such as 'I'
c_size = 9, // end of 'c' annotation
s_tag_val = 's', // payload is String
s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
s_size = 9,
min_size = 6 // smallest possible size (zero members)
};
while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
int index0 = index;
index = skip_annotation(buffer, limit, index);
u1* abase = buffer + index0;
int atype = Bytes::get_Java_u2(abase + atype_off);
int count = Bytes::get_Java_u2(abase + count_off);
Symbol* aname = check_symbol_at(_cp, atype);
if (aname == NULL) break; // invalid annotation name
Symbol* member = NULL;
if (count >= 1) {
int member_index = Bytes::get_Java_u2(abase + member_off);
member = check_symbol_at(_cp, member_index);
if (member == NULL) break; // invalid member name
}
// Here is where parsing particular annotations will take place.
AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
if (id == AnnotationCollector::_unknown) continue;
coll->set_annotation(id);
if (id == AnnotationCollector::_sun_misc_Contended) {
// @Contended can optionally specify the contention group.
//
// Contended group defines the equivalence class over the fields:
// the fields within the same contended group are not treated distinct.
// The only exception is default group, which does not incur the
// equivalence. Naturally, contention group for classes is meaningless.
//
// While the contention group is specified as String, annotation
// values are already interned, and we might as well use the constant
// pool index as the group tag.
//
u2 group_index = 0; // default contended group
if (count == 1
&& s_size == (index - index0) // match size
&& s_tag_val == *(abase + tag_off)
&& member == vmSymbols::value_name()) {
group_index = Bytes::get_Java_u2(abase + s_con_off);
if (_cp->symbol_at(group_index)->utf8_length() == 0) {
group_index = 0; // default contended group
}
}
coll->set_contended_group(group_index);
}
}
}
ClassFileParser::AnnotationCollector::ID
ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
Symbol* name) {
vmSymbols::SID sid = vmSymbols::find_sid(name);
// Privileged code can use all annotations. Other code silently drops some.
const bool privileged = loader_data->is_the_null_class_loader_data() ||
loader_data->is_ext_class_loader_data() ||
loader_data->is_anonymous();
switch (sid) {
case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_CallerSensitive;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_ForceInline;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_DontInline;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_InjectedProfile;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_LambdaForm_Compiled;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_LambdaForm_Hidden;
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
if (_location != _in_field) break; // only allow for fields
if (!privileged) break; // only allow in privileged code
return _field_Stable;
case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes
if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges
return _sun_misc_Contended;
default: break;
}
return AnnotationCollector::_unknown;
}
void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
if (is_contended())
f->set_contended_group(contended_group());
if (is_stable())
f->set_stable(true);
}
ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
// If there's an error deallocate metadata for field annotations
MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
}
void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
if (has_annotation(_method_CallerSensitive))
m->set_caller_sensitive(true);
if (has_annotation(_method_ForceInline))
m->set_force_inline(true);
if (has_annotation(_method_DontInline))
m->set_dont_inline(true);
if (has_annotation(_method_InjectedProfile))
m->set_has_injected_profile(true);
if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
if (has_annotation(_method_LambdaForm_Hidden))
m->set_hidden(true);
}
void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
k->set_is_contended(is_contended());
}
#define MAX_ARGS_SIZE 255
#define MAX_CODE_SIZE 65535
#define INITIAL_MAX_LVT_NUMBER 256
/* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
*
* Rules for LVT's and LVTT's are:
* - There can be any number of LVT's and LVTT's.
* - If there are n LVT's, it is the same as if there was just
* one LVT containing all the entries from the n LVT's.
* - There may be no more than one LVT entry per local variable.
* Two LVT entries are 'equal' if these fields are the same:
* start_pc, length, name, slot
* - There may be no more than one LVTT entry per each LVT entry.
* Each LVTT entry has to match some LVT entry.
* - HotSpot internal LVT keeps natural ordering of class file LVT entries.
*/
void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
int lvt_cnt,
u2* localvariable_table_length,
u2** localvariable_table_start,
int lvtt_cnt,
u2* localvariable_type_table_length,
u2** localvariable_type_table_start,
TRAPS) {
LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
initialize_hashtable(lvt_Hash);
// To fill LocalVariableTable in
Classfile_LVT_Element* cf_lvt;
LocalVariableTableElement* lvt = cm->localvariable_table_start();
for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
copy_lvt_element(&cf_lvt[idx], lvt);
// If no duplicates, add LVT elem in hashtable lvt_Hash.
if (LVT_put_after_lookup(lvt, lvt_Hash) == false
&& _need_verify
&& _major_version >= JAVA_1_5_VERSION) {
clear_hashtable(lvt_Hash);
classfile_parse_error("Duplicated LocalVariableTable attribute "
"entry for '%s' in class file %s",
_cp->symbol_at(lvt->name_cp_index)->as_utf8(),
CHECK);
}
}
}
// To merge LocalVariableTable and LocalVariableTypeTable
Classfile_LVT_Element* cf_lvtt;
LocalVariableTableElement lvtt_elem;
for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
int index = hash(&lvtt_elem);
LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
if (entry == NULL) {
if (_need_verify) {
clear_hashtable(lvt_Hash);
classfile_parse_error("LVTT entry for '%s' in class file %s "
"does not match any LVT entry",
_cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
CHECK);
}
} else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
clear_hashtable(lvt_Hash);
classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
"entry for '%s' in class file %s",
_cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
CHECK);
} else {
// to add generic signatures into LocalVariableTable
entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
}
}
}
clear_hashtable(lvt_Hash);
}
void ClassFileParser::copy_method_annotations(ConstMethod* cm,
u1* runtime_visible_annotations,
int runtime_visible_annotations_length,
u1* runtime_invisible_annotations,
int runtime_invisible_annotations_length,
u1* runtime_visible_parameter_annotations,
int runtime_visible_parameter_annotations_length,
u1* runtime_invisible_parameter_annotations,
int runtime_invisible_parameter_annotations_length,
u1* runtime_visible_type_annotations,
int runtime_visible_type_annotations_length,
u1* runtime_invisible_type_annotations,
int runtime_invisible_type_annotations_length,
u1* annotation_default,
int annotation_default_length,
TRAPS) {
AnnotationArray* a;
if (runtime_visible_annotations_length +
runtime_invisible_annotations_length > 0) {
a = assemble_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
CHECK);
cm->set_method_annotations(a);
}
if (runtime_visible_parameter_annotations_length +
runtime_invisible_parameter_annotations_length > 0) {
a = assemble_annotations(runtime_visible_parameter_annotations,
runtime_visible_parameter_annotations_length,
runtime_invisible_parameter_annotations,
runtime_invisible_parameter_annotations_length,
CHECK);
cm->set_parameter_annotations(a);
}
if (annotation_default_length > 0) {
a = assemble_annotations(annotation_default,
annotation_default_length,
NULL,
0,
CHECK);
cm->set_default_annotations(a);
}
if (runtime_visible_type_annotations_length +
runtime_invisible_type_annotations_length > 0) {
a = assemble_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
CHECK);
cm->set_type_annotations(a);
}
}
// Note: the parse_method below is big and clunky because all parsing of the code and exceptions
// attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
// Method* to save footprint, so we only know the size of the resulting Method* when the
// entire method attribute is parsed.
//
// The promoted_flags parameter is used to pass relevant access_flags
// from the method back up to the containing klass. These flag values
// are added to klass's access_flags.
methodHandle ClassFileParser::parse_method(bool is_interface,
AccessFlags *promoted_flags,
TRAPS) {
ClassFileStream* cfs = stream();
methodHandle nullHandle;
ResourceMark rm(THREAD);
// Parse fixed parts
cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
int flags = cfs->get_u2_fast();
u2 name_index = cfs->get_u2_fast();
int cp_size = _cp->length();
check_property(
valid_symbol_at(name_index),
"Illegal constant pool index %u for method name in class file %s",
name_index, CHECK_(nullHandle));
Symbol* name = _cp->symbol_at(name_index);
verify_legal_method_name(name, CHECK_(nullHandle));
u2 signature_index = cfs->get_u2_fast();
guarantee_property(
valid_symbol_at(signature_index),
"Illegal constant pool index %u for method signature in class file %s",
signature_index, CHECK_(nullHandle));
Symbol* signature = _cp->symbol_at(signature_index);
AccessFlags access_flags;
if (name == vmSymbols::class_initializer_name()) {
// We ignore the other access flags for a valid class initializer.
// (JVM Spec 2nd ed., chapter 4.6)
if (_major_version < 51) { // backward compatibility
flags = JVM_ACC_STATIC;
} else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
}
} else {
verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
}
int args_size = -1; // only used when _need_verify is true
if (_need_verify) {
args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
verify_legal_method_signature(name, signature, CHECK_(nullHandle));
if (args_size > MAX_ARGS_SIZE) {
classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
}
}
access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
// Default values for code and exceptions attribute elements
u2 max_stack = 0;
u2 max_locals = 0;
u4 code_length = 0;
u1* code_start = 0;
u2 exception_table_length = 0;
u2* exception_table_start = NULL;
Array<int>* exception_handlers = Universe::the_empty_int_array();
u2 checked_exceptions_length = 0;
u2* checked_exceptions_start = NULL;
CompressedLineNumberWriteStream* linenumber_table = NULL;
int linenumber_table_length = 0;
int total_lvt_length = 0;
u2 lvt_cnt = 0;
u2 lvtt_cnt = 0;
bool lvt_allocated = false;
u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
u2* localvariable_table_length;
u2** localvariable_table_start;
u2* localvariable_type_table_length;
u2** localvariable_type_table_start;
u2 method_parameters_length = 0;
u1* method_parameters_data = NULL;
bool method_parameters_seen = false;
bool parsed_code_attribute = false;
bool parsed_checked_exceptions_attribute = false;
bool parsed_stackmap_attribute = false;
// stackmap attribute - JDK1.5
u1* stackmap_data = NULL;
int stackmap_data_length = 0;
u2 generic_signature_index = 0;
MethodAnnotationCollector parsed_annotations;
u1* runtime_visible_annotations = NULL;
int runtime_visible_annotations_length = 0;
u1* runtime_invisible_annotations = NULL;
int runtime_invisible_annotations_length = 0;
u1* runtime_visible_parameter_annotations = NULL;
int runtime_visible_parameter_annotations_length = 0;
u1* runtime_invisible_parameter_annotations = NULL;
int runtime_invisible_parameter_annotations_length = 0;
u1* runtime_visible_type_annotations = NULL;
int runtime_visible_type_annotations_length = 0;
u1* runtime_invisible_type_annotations = NULL;
int runtime_invisible_type_annotations_length = 0;
bool runtime_invisible_type_annotations_exists = false;
u1* annotation_default = NULL;
int annotation_default_length = 0;
// Parse code and exceptions attribute
u2 method_attributes_count = cfs->get_u2_fast();
while (method_attributes_count--) {
cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length
u2 method_attribute_name_index = cfs->get_u2_fast();
u4 method_attribute_length = cfs->get_u4_fast();
check_property(
valid_symbol_at(method_attribute_name_index),
"Invalid method attribute name index %u in class file %s",
method_attribute_name_index, CHECK_(nullHandle));
Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
if (method_attribute_name == vmSymbols::tag_code()) {
// Parse Code attribute
if (_need_verify) {
guarantee_property(
!access_flags.is_native() && !access_flags.is_abstract(),
"Code attribute in native or abstract methods in class file %s",
CHECK_(nullHandle));
}
if (parsed_code_attribute) {
classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
}
parsed_code_attribute = true;
// Stack size, locals size, and code size
if (_major_version == 45 && _minor_version <= 2) {
cfs->guarantee_more(4, CHECK_(nullHandle));
max_stack = cfs->get_u1_fast();
max_locals = cfs->get_u1_fast();
code_length = cfs->get_u2_fast();
} else {
cfs->guarantee_more(8, CHECK_(nullHandle));
max_stack = cfs->get_u2_fast();
max_locals = cfs->get_u2_fast();
code_length = cfs->get_u4_fast();
}
if (_need_verify) {
guarantee_property(args_size <= max_locals,
"Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
"Invalid method Code length %u in class file %s",
code_length, CHECK_(nullHandle));
}
// Code pointer
code_start = cfs->get_u1_buffer();
assert(code_start != NULL, "null code start");
cfs->guarantee_more(code_length, CHECK_(nullHandle));
cfs->skip_u1_fast(code_length);
// Exception handler table
cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length
exception_table_length = cfs->get_u2_fast();
if (exception_table_length > 0) {
exception_table_start =
parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
}
// Parse additional attributes in code attribute
cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count
u2 code_attributes_count = cfs->get_u2_fast();
unsigned int calculated_attribute_length = 0;
if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
calculated_attribute_length =
sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
} else {
// max_stack, locals and length are smaller in pre-version 45.2 classes
calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
}
calculated_attribute_length +=
code_length +
sizeof(exception_table_length) +
sizeof(code_attributes_count) +
exception_table_length *
( sizeof(u2) + // start_pc
sizeof(u2) + // end_pc
sizeof(u2) + // handler_pc
sizeof(u2) ); // catch_type_index
while (code_attributes_count--) {
cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length
u2 code_attribute_name_index = cfs->get_u2_fast();
u4 code_attribute_length = cfs->get_u4_fast();
calculated_attribute_length += code_attribute_length +
sizeof(code_attribute_name_index) +
sizeof(code_attribute_length);
check_property(valid_symbol_at(code_attribute_name_index),
"Invalid code attribute name index %u in class file %s",
code_attribute_name_index,
CHECK_(nullHandle));
if (LoadLineNumberTables &&
_cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
// Parse and compress line number table
parse_linenumber_table(code_attribute_length, code_length,
&linenumber_table, CHECK_(nullHandle));
} else if (LoadLocalVariableTables &&
_cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
// Parse local variable table
if (!lvt_allocated) {
localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
lvt_allocated = true;
}
if (lvt_cnt == max_lvt_cnt) {
max_lvt_cnt <<= 1;
localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
}
localvariable_table_start[lvt_cnt] =
parse_localvariable_table(code_length,
max_locals,
code_attribute_length,
&localvariable_table_length[lvt_cnt],
false, // is not LVTT
CHECK_(nullHandle));
total_lvt_length += localvariable_table_length[lvt_cnt];
lvt_cnt++;
} else if (LoadLocalVariableTypeTables &&
_major_version >= JAVA_1_5_VERSION &&
_cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
if (!lvt_allocated) {
localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
lvt_allocated = true;
}
// Parse local variable type table
if (lvtt_cnt == max_lvtt_cnt) {
max_lvtt_cnt <<= 1;
localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
}
localvariable_type_table_start[lvtt_cnt] =
parse_localvariable_table(code_length,
max_locals,
code_attribute_length,
&localvariable_type_table_length[lvtt_cnt],
true, // is LVTT
CHECK_(nullHandle));
lvtt_cnt++;
} else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
_cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
// Stack map is only needed by the new verifier in JDK1.5.
if (parsed_stackmap_attribute) {
classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
}
stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
stackmap_data_length = code_attribute_length;
parsed_stackmap_attribute = true;
} else {
// Skip unknown attributes
cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
}
}
// check method attribute length
if (_need_verify) {
guarantee_property(method_attribute_length == calculated_attribute_length,
"Code segment has wrong length in class file %s", CHECK_(nullHandle));
}
} else if (method_attribute_name == vmSymbols::tag_exceptions()) {
// Parse Exceptions attribute
if (parsed_checked_exceptions_attribute) {
classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
}
parsed_checked_exceptions_attribute = true;
checked_exceptions_start =
parse_checked_exceptions(&checked_exceptions_length,
method_attribute_length,
CHECK_(nullHandle));
} else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
// reject multiple method parameters
if (method_parameters_seen) {
classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
}
method_parameters_seen = true;
method_parameters_length = cfs->get_u1_fast();
if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
classfile_parse_error(
"Invalid MethodParameters method attribute length %u in class file",
method_attribute_length, CHECK_(nullHandle));
}
method_parameters_data = cfs->get_u1_buffer();
cfs->skip_u2_fast(method_parameters_length);
cfs->skip_u2_fast(method_parameters_length);
// ignore this attribute if it cannot be reflected
if (!SystemDictionary::Parameter_klass_loaded())
method_parameters_length = 0;
} else if (method_attribute_name == vmSymbols::tag_synthetic()) {
if (method_attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic method attribute length %u in class file %s",
method_attribute_length, CHECK_(nullHandle));
}
// Should we check that there hasn't already been a synthetic attribute?
access_flags.set_is_synthetic();
} else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
if (method_attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated method attribute length %u in class file %s",
method_attribute_length, CHECK_(nullHandle));
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (method_attribute_name == vmSymbols::tag_signature()) {
if (method_attribute_length != 2) {
classfile_parse_error(
"Invalid Signature attribute length %u in class file %s",
method_attribute_length, CHECK_(nullHandle));
}
generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
runtime_visible_annotations_length = method_attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(runtime_visible_annotations,
runtime_visible_annotations_length, &parsed_annotations,
CHECK_(nullHandle));
cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
} else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
runtime_invisible_annotations_length = method_attribute_length;
runtime_invisible_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_annotations != NULL, "null invisible annotations");
cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
runtime_visible_parameter_annotations_length = method_attribute_length;
runtime_visible_parameter_annotations = cfs->get_u1_buffer();
assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
} else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
runtime_invisible_parameter_annotations_length = method_attribute_length;
runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
} else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
annotation_default_length = method_attribute_length;
annotation_default = cfs->get_u1_buffer();
assert(annotation_default != NULL, "null annotation default");
cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
CHECK_(nullHandle));
}
runtime_visible_type_annotations_length = method_attribute_length;
runtime_visible_type_annotations = cfs->get_u1_buffer();
assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
// No need for the VM to parse Type annotations
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
} else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
CHECK_(nullHandle));
} else {
runtime_invisible_type_annotations_exists = true;
}
if (PreserveAllAnnotations) {
runtime_invisible_type_annotations_length = method_attribute_length;
runtime_invisible_type_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
}
cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
} else {
// Skip unknown attributes
cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
}
} else {
// Skip unknown attributes
cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
}
}
if (linenumber_table != NULL) {
linenumber_table->write_terminator();
linenumber_table_length = linenumber_table->position();
}
// Make sure there's at least one Code attribute in non-native/non-abstract method
if (_need_verify) {
guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
"Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
}
// All sizing information for a Method* is finally available, now create it
InlineTableSizes sizes(
total_lvt_length,
linenumber_table_length,
exception_table_length,
checked_exceptions_length,
method_parameters_length,
generic_signature_index,
runtime_visible_annotations_length +
runtime_invisible_annotations_length,
runtime_visible_parameter_annotations_length +
runtime_invisible_parameter_annotations_length,
runtime_visible_type_annotations_length +
runtime_invisible_type_annotations_length,
annotation_default_length,
0);
Method* m = Method::allocate(
_loader_data, code_length, access_flags, &sizes,
ConstMethod::NORMAL, CHECK_(nullHandle));
ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
// Fill in information from fixed part (access_flags already set)
m->set_constants(_cp);
m->set_name_index(name_index);
m->set_signature_index(signature_index);
ResultTypeFinder rtf(_cp->symbol_at(signature_index));
m->constMethod()->set_result_type(rtf.type());
if (args_size >= 0) {
m->set_size_of_parameters(args_size);
} else {
m->compute_size_of_parameters(THREAD);
}
#ifdef ASSERT
if (args_size >= 0) {
m->compute_size_of_parameters(THREAD);
assert(args_size == m->size_of_parameters(), "");
}
#endif
// Fill in code attribute information
m->set_max_stack(max_stack);
m->set_max_locals(max_locals);
if (stackmap_data != NULL) {
m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
stackmap_data_length, CHECK_NULL);
}
// Copy byte codes
m->set_code(code_start);
// Copy line number table
if (linenumber_table != NULL) {
memcpy(m->compressed_linenumber_table(),
linenumber_table->buffer(), linenumber_table_length);
}
// Copy exception table
if (exception_table_length > 0) {
int size =
exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
copy_u2_with_conversion((u2*) m->exception_table_start(),
exception_table_start, size);
}
// Copy method parameters
if (method_parameters_length > 0) {
MethodParametersElement* elem = m->constMethod()->method_parameters_start();
for (int i = 0; i < method_parameters_length; i++) {
elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
method_parameters_data += 2;
elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
method_parameters_data += 2;
}
}
// Copy checked exceptions
if (checked_exceptions_length > 0) {
int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
}
// Copy class file LVT's/LVTT's into the HotSpot internal LVT.
if (total_lvt_length > 0) {
promoted_flags->set_has_localvariable_table();
copy_localvariable_table(m->constMethod(), lvt_cnt,
localvariable_table_length,
localvariable_table_start,
lvtt_cnt,
localvariable_type_table_length,
localvariable_type_table_start, CHECK_NULL);
}
if (parsed_annotations.has_any_annotations())
parsed_annotations.apply_to(m);
// Copy annotations
copy_method_annotations(m->constMethod(),
runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
runtime_visible_parameter_annotations,
runtime_visible_parameter_annotations_length,
runtime_invisible_parameter_annotations,
runtime_invisible_parameter_annotations_length,
runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
annotation_default,
annotation_default_length,
CHECK_NULL);
if (name == vmSymbols::finalize_method_name() &&
signature == vmSymbols::void_method_signature()) {
if (m->is_empty_method()) {
_has_empty_finalizer = true;
} else {
_has_finalizer = true;
}
}
if (name == vmSymbols::object_initializer_name() &&
signature == vmSymbols::void_method_signature() &&
m->is_vanilla_constructor()) {
_has_vanilla_constructor = true;
}
NOT_PRODUCT(m->verify());
return m;
}
// The promoted_flags parameter is used to pass relevant access_flags
// from the methods back up to the containing klass. These flag values
// are added to klass's access_flags.
Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
AccessFlags* promoted_flags,
bool* has_final_method,
bool* declares_default_methods,
TRAPS) {
ClassFileStream* cfs = stream();
cfs->guarantee_more(2, CHECK_NULL); // length
u2 length = cfs->get_u2_fast();
if (length == 0) {
_methods = Universe::the_empty_method_array();
} else {
_methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
HandleMark hm(THREAD);
for (int index = 0; index < length; index++) {
methodHandle method = parse_method(is_interface,
promoted_flags,
CHECK_NULL);
if (method->is_final()) {
*has_final_method = true;
}
// declares_default_methods: declares concrete instance methods, any access flags
// used for interface initialization, and default method inheritance analysis
if (is_interface && !(*declares_default_methods)
&& !method->is_abstract() && !method->is_static()) {
*declares_default_methods = true;
}
_methods->at_put(index, method());
}
if (_need_verify && length > 1) {
// Check duplicated methods
ResourceMark rm(THREAD);
NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, NameSigHash*, HASH_ROW_SIZE);
initialize_hashtable(names_and_sigs);
bool dup = false;
{
debug_only(No_Safepoint_Verifier nsv;)
for (int i = 0; i < length; i++) {
Method* m = _methods->at(i);
// If no duplicates, add name/signature in hashtable names_and_sigs.
if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
dup = true;
break;
}
}
}
if (dup) {
classfile_parse_error("Duplicate method name&signature in class file %s",
CHECK_NULL);
}
}
}
return _methods;
}
intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
int length = methods->length();
// If JVMTI original method ordering or sharing is enabled we have to
// remember the original class file ordering.
// We temporarily use the vtable_index field in the Method* to store the
// class file index, so we can read in after calling qsort.
// Put the method ordering in the shared archive.
if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
for (int index = 0; index < length; index++) {
Method* m = methods->at(index);
assert(!m->valid_vtable_index(), "vtable index should not be set");
m->set_vtable_index(index);
}
}
// Sort method array by ascending method name (for faster lookups & vtable construction)
// Note that the ordering is not alphabetical, see Symbol::fast_compare
Method::sort_methods(methods);
intArray* method_ordering = NULL;
// If JVMTI original method ordering or sharing is enabled construct int
// array remembering the original ordering
if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
method_ordering = new intArray(length);
for (int index = 0; index < length; index++) {
Method* m = methods->at(index);
int old_index = m->vtable_index();
assert(old_index >= 0 && old_index < length, "invalid method index");
method_ordering->at_put(index, old_index);
m->set_vtable_index(Method::invalid_vtable_index);
}
}
return method_ordering;
}
// Parse generic_signature attribute for methods and fields
u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
ClassFileStream* cfs = stream();
cfs->guarantee_more(2, CHECK_0); // generic_signature_index
u2 generic_signature_index = cfs->get_u2_fast();
check_property(
valid_symbol_at(generic_signature_index),
"Invalid Signature attribute at constant pool index %u in class file %s",
generic_signature_index, CHECK_0);
return generic_signature_index;
}
void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
ClassFileStream* cfs = stream();
cfs->guarantee_more(2, CHECK); // sourcefile_index
u2 sourcefile_index = cfs->get_u2_fast();
check_property(
valid_symbol_at(sourcefile_index),
"Invalid SourceFile attribute at constant pool index %u in class file %s",
sourcefile_index, CHECK);
set_class_sourcefile_index(sourcefile_index);
}
void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
ClassFileStream* cfs = stream();
u1* sde_buffer = cfs->get_u1_buffer();
assert(sde_buffer != NULL, "null sde buffer");
// Don't bother storing it if there is no way to retrieve it
if (JvmtiExport::can_get_source_debug_extension()) {
assert((length+1) > length, "Overflow checking");
u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
for (int i = 0; i < length; i++) {
sde[i] = sde_buffer[i];
}
sde[length] = '\0';
set_class_sde_buffer((char*)sde, length);
}
// Got utf8 string, set stream position forward
cfs->skip_u1(length, CHECK);
}
// Inner classes can be static, private or protected (classic VM does this)
#define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
// Return number of classes in the inner classes attribute table
u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
bool parsed_enclosingmethod_attribute,
u2 enclosing_method_class_index,
u2 enclosing_method_method_index,
TRAPS) {
ClassFileStream* cfs = stream();
u1* current_mark = cfs->current();
u2 length = 0;
if (inner_classes_attribute_start != NULL) {
cfs->set_current(inner_classes_attribute_start);
cfs->guarantee_more(2, CHECK_0); // length
length = cfs->get_u2_fast();
}
// 4-tuples of shorts of inner classes data and 2 shorts of enclosing
// method data:
// [inner_class_info_index,
// outer_class_info_index,
// inner_name_index,
// inner_class_access_flags,
// ...
// enclosing_method_class_index,
// enclosing_method_method_index]
int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
_inner_classes = inner_classes;
int index = 0;
int cp_size = _cp->length();
cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
for (int n = 0; n < length; n++) {
// Inner class index
u2 inner_class_info_index = cfs->get_u2_fast();
check_property(
inner_class_info_index == 0 ||
valid_klass_reference_at(inner_class_info_index),
"inner_class_info_index %u has bad constant type in class file %s",
inner_class_info_index, CHECK_0);
// Outer class index
u2 outer_class_info_index = cfs->get_u2_fast();
check_property(
outer_class_info_index == 0 ||
valid_klass_reference_at(outer_class_info_index),
"outer_class_info_index %u has bad constant type in class file %s",
outer_class_info_index, CHECK_0);
// Inner class name
u2 inner_name_index = cfs->get_u2_fast();
check_property(
inner_name_index == 0 || valid_symbol_at(inner_name_index),
"inner_name_index %u has bad constant type in class file %s",
inner_name_index, CHECK_0);
if (_need_verify) {
guarantee_property(inner_class_info_index != outer_class_info_index,
"Class is both outer and inner class in class file %s", CHECK_0);
}
// Access flags
AccessFlags inner_access_flags;
jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
// Set abstract bit for old class files for backward compatibility
flags |= JVM_ACC_ABSTRACT;
}
verify_legal_class_modifiers(flags, CHECK_0);
inner_access_flags.set_flags(flags);
inner_classes->at_put(index++, inner_class_info_index);
inner_classes->at_put(index++, outer_class_info_index);
inner_classes->at_put(index++, inner_name_index);
inner_classes->at_put(index++, inner_access_flags.as_short());
}
// 4347400: make sure there's no duplicate entry in the classes array
if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
for(int i = 0; i < length * 4; i += 4) {
for(int j = i + 4; j < length * 4; j += 4) {
guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
inner_classes->at(i+1) != inner_classes->at(j+1) ||
inner_classes->at(i+2) != inner_classes->at(j+2) ||
inner_classes->at(i+3) != inner_classes->at(j+3)),
"Duplicate entry in InnerClasses in class file %s",
CHECK_0);
}
}
}
// Set EnclosingMethod class and method indexes.
if (parsed_enclosingmethod_attribute) {
inner_classes->at_put(index++, enclosing_method_class_index);
inner_classes->at_put(index++, enclosing_method_method_index);
}
assert(index == size, "wrong size");
// Restore buffer's current position.
cfs->set_current(current_mark);
return length;
}
void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
set_class_synthetic_flag(true);
}
void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
ClassFileStream* cfs = stream();
u2 signature_index = cfs->get_u2(CHECK);
check_property(
valid_symbol_at(signature_index),
"Invalid constant pool index %u in Signature attribute in class file %s",
signature_index, CHECK);
set_class_generic_signature_index(signature_index);
}
void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
ClassFileStream* cfs = stream();
u1* current_start = cfs->current();
guarantee_property(attribute_byte_length >= sizeof(u2),
"Invalid BootstrapMethods attribute length %u in class file %s",
attribute_byte_length,
CHECK);
cfs->guarantee_more(attribute_byte_length, CHECK);
int attribute_array_length = cfs->get_u2_fast();
guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
"Short length on BootstrapMethods in class file %s",
CHECK);
// The attribute contains a counted array of counted tuples of shorts,
// represending bootstrap specifiers:
// length*{bootstrap_method_index, argument_count*{argument_index}}
int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
// operand_count = number of shorts in attr, except for leading length
// The attribute is copied into a short[] array.
// The array begins with a series of short[2] pairs, one for each tuple.
int index_size = (attribute_array_length * 2);
Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
// Eagerly assign operands so they will be deallocated with the constant
// pool if there is an error.
_cp->set_operands(operands);
int operand_fill_index = index_size;
int cp_size = _cp->length();
for (int n = 0; n < attribute_array_length; n++) {
// Store a 32-bit offset into the header of the operand array.
ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
// Read a bootstrap specifier.
cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
u2 bootstrap_method_index = cfs->get_u2_fast();
u2 argument_count = cfs->get_u2_fast();
check_property(
valid_cp_range(bootstrap_method_index, cp_size) &&
_cp->tag_at(bootstrap_method_index).is_method_handle(),
"bootstrap_method_index %u has bad constant type in class file %s",
bootstrap_method_index,
CHECK);
guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
"Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
CHECK);
operands->at_put(operand_fill_index++, bootstrap_method_index);
operands->at_put(operand_fill_index++, argument_count);
cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
for (int j = 0; j < argument_count; j++) {
u2 argument_index = cfs->get_u2_fast();
check_property(
valid_cp_range(argument_index, cp_size) &&
_cp->tag_at(argument_index).is_loadable_constant(),
"argument_index %u has bad constant type in class file %s",
argument_index,
CHECK);
operands->at_put(operand_fill_index++, argument_index);
}
}
assert(operand_fill_index == operands->length(), "exact fill");
u1* current_end = cfs->current();
guarantee_property(current_end == current_start + attribute_byte_length,
"Bad length on BootstrapMethods in class file %s",
CHECK);
}
void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
TRAPS) {
ClassFileStream* cfs = stream();
// Set inner classes attribute to default sentinel
_inner_classes = Universe::the_empty_short_array();
cfs->guarantee_more(2, CHECK); // attributes_count
u2 attributes_count = cfs->get_u2_fast();
bool parsed_sourcefile_attribute = false;
bool parsed_innerclasses_attribute = false;
bool parsed_enclosingmethod_attribute = false;
bool parsed_bootstrap_methods_attribute = false;
u1* runtime_visible_annotations = NULL;
int runtime_visible_annotations_length = 0;
u1* runtime_invisible_annotations = NULL;
int runtime_invisible_annotations_length = 0;
u1* runtime_visible_type_annotations = NULL;
int runtime_visible_type_annotations_length = 0;
u1* runtime_invisible_type_annotations = NULL;
int runtime_invisible_type_annotations_length = 0;
bool runtime_invisible_type_annotations_exists = false;
u1* inner_classes_attribute_start = NULL;
u4 inner_classes_attribute_length = 0;
u2 enclosing_method_class_index = 0;
u2 enclosing_method_method_index = 0;
// Iterate over attributes
while (attributes_count--) {
cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
u2 attribute_name_index = cfs->get_u2_fast();
u4 attribute_length = cfs->get_u4_fast();
check_property(
valid_symbol_at(attribute_name_index),
"Attribute name has bad constant pool index %u in class file %s",
attribute_name_index, CHECK);
Symbol* tag = _cp->symbol_at(attribute_name_index);
if (tag == vmSymbols::tag_source_file()) {
// Check for SourceFile tag
if (_need_verify) {
guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
}
if (parsed_sourcefile_attribute) {
classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
} else {
parsed_sourcefile_attribute = true;
}
parse_classfile_sourcefile_attribute(CHECK);
} else if (tag == vmSymbols::tag_source_debug_extension()) {
// Check for SourceDebugExtension tag
parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
} else if (tag == vmSymbols::tag_inner_classes()) {
// Check for InnerClasses tag
if (parsed_innerclasses_attribute) {
classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
} else {
parsed_innerclasses_attribute = true;
}
inner_classes_attribute_start = cfs->get_u1_buffer();
inner_classes_attribute_length = attribute_length;
cfs->skip_u1(inner_classes_attribute_length, CHECK);
} else if (tag == vmSymbols::tag_synthetic()) {
// Check for Synthetic tag
// Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic classfile attribute length %u in class file %s",
attribute_length, CHECK);
}
parse_classfile_synthetic_attribute(CHECK);
} else if (tag == vmSymbols::tag_deprecated()) {
// Check for Deprecatd tag - 4276120
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated classfile attribute length %u in class file %s",
attribute_length, CHECK);
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (tag == vmSymbols::tag_signature()) {
if (attribute_length != 2) {
classfile_parse_error(
"Wrong Signature attribute length %u in class file %s",
attribute_length, CHECK);
}
parse_classfile_signature_attribute(CHECK);
} else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
parsed_annotations,
CHECK);
cfs->skip_u1(runtime_visible_annotations_length, CHECK);
} else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
runtime_invisible_annotations_length = attribute_length;
runtime_invisible_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_annotations != NULL, "null invisible annotations");
cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
} else if (tag == vmSymbols::tag_enclosing_method()) {
if (parsed_enclosingmethod_attribute) {
classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
} else {
parsed_enclosingmethod_attribute = true;
}
cfs->guarantee_more(4, CHECK); // class_index, method_index
enclosing_method_class_index = cfs->get_u2_fast();
enclosing_method_method_index = cfs->get_u2_fast();
if (enclosing_method_class_index == 0) {
classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
}
// Validate the constant pool indices and types
check_property(valid_klass_reference_at(enclosing_method_class_index),
"Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
if (enclosing_method_method_index != 0 &&
(!_cp->is_within_bounds(enclosing_method_method_index) ||
!_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
}
} else if (tag == vmSymbols::tag_bootstrap_methods() &&
_major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
if (parsed_bootstrap_methods_attribute)
classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
parsed_bootstrap_methods_attribute = true;
parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
} else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
}
runtime_visible_type_annotations_length = attribute_length;
runtime_visible_type_annotations = cfs->get_u1_buffer();
assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
// No need for the VM to parse Type annotations
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
} else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
} else {
runtime_invisible_type_annotations_exists = true;
}
if (PreserveAllAnnotations) {
runtime_invisible_type_annotations_length = attribute_length;
runtime_invisible_type_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
}
cfs->skip_u1(attribute_length, CHECK);
} else {
// Unknown attribute
cfs->skip_u1(attribute_length, CHECK);
}
} else {
// Unknown attribute
cfs->skip_u1(attribute_length, CHECK);
}
}
_annotations = assemble_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
CHECK);
_type_annotations = assemble_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
CHECK);
if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
u2 num_of_classes = parse_classfile_inner_classes_attribute(
inner_classes_attribute_start,
parsed_innerclasses_attribute,
enclosing_method_class_index,
enclosing_method_method_index,
CHECK);
if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
guarantee_property(
inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
"Wrong InnerClasses attribute length in class file %s", CHECK);
}
}
if (_max_bootstrap_specifier_index >= 0) {
guarantee_property(parsed_bootstrap_methods_attribute,
"Missing BootstrapMethods attribute in class file %s", CHECK);
}
}
void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
if (_synthetic_flag)
k->set_is_synthetic();
if (_sourcefile_index != 0) {
k->set_source_file_name_index(_sourcefile_index);
}
if (_generic_signature_index != 0) {
k->set_generic_signature_index(_generic_signature_index);
}
if (_sde_buffer != NULL) {
k->set_source_debug_extension(_sde_buffer, _sde_length);
}
}
// Create the Annotations object that will
// hold the annotations array for the Klass.
void ClassFileParser::create_combined_annotations(TRAPS) {
if (_annotations == NULL &&
_type_annotations == NULL &&
_fields_annotations == NULL &&
_fields_type_annotations == NULL) {
// Don't create the Annotations object unnecessarily.
return;
}
Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
annotations->set_class_annotations(_annotations);
annotations->set_class_type_annotations(_type_annotations);
annotations->set_fields_annotations(_fields_annotations);
annotations->set_fields_type_annotations(_fields_type_annotations);
// This is the Annotations object that will be
// assigned to InstanceKlass being constructed.
_combined_annotations = annotations;
// The annotations arrays below has been transfered the
// _combined_annotations so these fields can now be cleared.
_annotations = NULL;
_type_annotations = NULL;
_fields_annotations = NULL;
_fields_type_annotations = NULL;
}
// Transfer ownership of metadata allocated to the InstanceKlass.
void ClassFileParser::apply_parsed_class_metadata(
instanceKlassHandle this_klass,
int java_fields_count, TRAPS) {
_cp->set_pool_holder(this_klass());
this_klass->set_constants(_cp);
this_klass->set_fields(_fields, java_fields_count);
this_klass->set_methods(_methods);
this_klass->set_inner_classes(_inner_classes);
this_klass->set_local_interfaces(_local_interfaces);
this_klass->set_transitive_interfaces(_transitive_interfaces);
this_klass->set_annotations(_combined_annotations);
// Clear out these fields so they don't get deallocated by the destructor
clear_class_metadata();
}
AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
int runtime_visible_annotations_length,
u1* runtime_invisible_annotations,
int runtime_invisible_annotations_length, TRAPS) {
AnnotationArray* annotations = NULL;
if (runtime_visible_annotations != NULL ||
runtime_invisible_annotations != NULL) {
annotations = MetadataFactory::new_array<u1>(_loader_data,
runtime_visible_annotations_length +
runtime_invisible_annotations_length,
CHECK_(annotations));
if (runtime_visible_annotations != NULL) {
for (int i = 0; i < runtime_visible_annotations_length; i++) {
annotations->at_put(i, runtime_visible_annotations[i]);
}
}
if (runtime_invisible_annotations != NULL) {
for (int i = 0; i < runtime_invisible_annotations_length; i++) {
int append = runtime_visible_annotations_length+i;
annotations->at_put(append, runtime_invisible_annotations[i]);
}
}
}
return annotations;
}
instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
TRAPS) {
instanceKlassHandle super_klass;
if (super_class_index == 0) {
check_property(_class_name == vmSymbols::java_lang_Object(),
"Invalid superclass index %u in class file %s",
super_class_index,
CHECK_NULL);
} else {
check_property(valid_klass_reference_at(super_class_index),
"Invalid superclass index %u in class file %s",
super_class_index,
CHECK_NULL);
// The class name should be legal because it is checked when parsing constant pool.
// However, make sure it is not an array type.
bool is_array = false;
if (_cp->tag_at(super_class_index).is_klass()) {
super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
if (_need_verify)
is_array = super_klass->oop_is_array();
} else if (_need_verify) {
is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
}
if (_need_verify) {
guarantee_property(!is_array,
"Bad superclass name in class file %s", CHECK_NULL);
}
}
return super_klass;
}
// Values needed for oopmap and InstanceKlass creation
class FieldLayoutInfo : public StackObj {
public:
int* nonstatic_oop_offsets;
unsigned int* nonstatic_oop_counts;
unsigned int nonstatic_oop_map_count;
unsigned int total_oop_map_count;
int instance_size;
int nonstatic_field_size;
int static_field_size;
bool has_nonstatic_fields;
};
// Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
void ClassFileParser::layout_fields(Handle class_loader,
FieldAllocationCount* fac,
ClassAnnotationCollector* parsed_annotations,
FieldLayoutInfo* info,
TRAPS) {
// Field size and offset computation
int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
int next_static_oop_offset = 0;
int next_static_double_offset = 0;
int next_static_word_offset = 0;
int next_static_short_offset = 0;
int next_static_byte_offset = 0;
int next_nonstatic_oop_offset = 0;
int next_nonstatic_double_offset = 0;
int next_nonstatic_word_offset = 0;
int next_nonstatic_short_offset = 0;
int next_nonstatic_byte_offset = 0;
int first_nonstatic_oop_offset = 0;
int next_nonstatic_field_offset = 0;
int next_nonstatic_padded_offset = 0;
// Count the contended fields by type.
//
// We ignore static fields, because @Contended is not supported for them.
// The layout code below will also ignore the static fields.
int nonstatic_contended_count = 0;
FieldAllocationCount fac_contended;
for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
if (fs.is_contended()) {
fac_contended.count[atype]++;
if (!fs.access_flags().is_static()) {
nonstatic_contended_count++;
}
}
}
// Calculate the starting byte offsets
next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
next_static_double_offset = next_static_oop_offset +
((fac->count[STATIC_OOP]) * heapOopSize);
if ( fac->count[STATIC_DOUBLE] &&
(Universe::field_type_should_be_aligned(T_DOUBLE) ||
Universe::field_type_should_be_aligned(T_LONG)) ) {
next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
}
next_static_word_offset = next_static_double_offset +
((fac->count[STATIC_DOUBLE]) * BytesPerLong);
next_static_short_offset = next_static_word_offset +
((fac->count[STATIC_WORD]) * BytesPerInt);
next_static_byte_offset = next_static_short_offset +
((fac->count[STATIC_SHORT]) * BytesPerShort);
int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
nonstatic_field_size * heapOopSize;
next_nonstatic_field_offset = nonstatic_fields_start;
bool is_contended_class = parsed_annotations->is_contended();
// Class is contended, pad before all the fields
if (is_contended_class) {
next_nonstatic_field_offset += ContendedPaddingWidth;
}
// Compute the non-contended fields count.
// The packing code below relies on these counts to determine if some field
// can be squeezed into the alignment gap. Contended fields are obviously
// exempt from that.
unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
// Total non-static fields count, including every contended field
unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
fac->count[NONSTATIC_OOP];
bool super_has_nonstatic_fields =
(_super_klass() != NULL && _super_klass->has_nonstatic_fields());
bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
// Prepare list of oops for oop map generation.
//
// "offset" and "count" lists are describing the set of contiguous oop
// regions. offset[i] is the start of the i-th region, which then has
// count[i] oops following. Before we know how many regions are required,
// we pessimistically allocate the maps to fit all the oops into the
// distinct regions.
//
// TODO: We add +1 to always allocate non-zero resource arrays; we need
// to figure out if we still need to do this.
int* nonstatic_oop_offsets;
unsigned int* nonstatic_oop_counts;
unsigned int nonstatic_oop_map_count = 0;
unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, int, max_nonstatic_oop_maps);
nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, unsigned int, max_nonstatic_oop_maps);
first_nonstatic_oop_offset = 0; // will be set for first oop field
bool compact_fields = CompactFields;
int allocation_style = FieldsAllocationStyle;
if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
assert(false, "0 <= FieldsAllocationStyle <= 2");
allocation_style = 1; // Optimistic
}
// The next classes have predefined hard-coded fields offsets
// (see in JavaClasses::compute_hard_coded_offsets()).
// Use default fields allocation order for them.
if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
(_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
_class_name == vmSymbols::java_lang_Class() ||
_class_name == vmSymbols::java_lang_ClassLoader() ||
_class_name == vmSymbols::java_lang_ref_Reference() ||
_class_name == vmSymbols::java_lang_ref_SoftReference() ||
_class_name == vmSymbols::java_lang_StackTraceElement() ||
_class_name == vmSymbols::java_lang_String() ||
_class_name == vmSymbols::java_lang_Throwable() ||
_class_name == vmSymbols::java_lang_Boolean() ||
_class_name == vmSymbols::java_lang_Character() ||
_class_name == vmSymbols::java_lang_Float() ||
_class_name == vmSymbols::java_lang_Double() ||
_class_name == vmSymbols::java_lang_Byte() ||
_class_name == vmSymbols::java_lang_Short() ||
_class_name == vmSymbols::java_lang_Integer() ||
_class_name == vmSymbols::java_lang_Long())) {
allocation_style = 0; // Allocate oops first
compact_fields = false; // Don't compact fields
}
// Rearrange fields for a given allocation style
if( allocation_style == 0 ) {
// Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
next_nonstatic_oop_offset = next_nonstatic_field_offset;
next_nonstatic_double_offset = next_nonstatic_oop_offset +
(nonstatic_oop_count * heapOopSize);
} else if( allocation_style == 1 ) {
// Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
next_nonstatic_double_offset = next_nonstatic_field_offset;
} else if( allocation_style == 2 ) {
// Fields allocation: oops fields in super and sub classes are together.
if( nonstatic_field_size > 0 && _super_klass() != NULL &&
_super_klass->nonstatic_oop_map_size() > 0 ) {
unsigned int map_count = _super_klass->nonstatic_oop_map_count();
OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
OopMapBlock* last_map = first_map + map_count - 1;
int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
if (next_offset == next_nonstatic_field_offset) {
allocation_style = 0; // allocate oops first
next_nonstatic_oop_offset = next_nonstatic_field_offset;
next_nonstatic_double_offset = next_nonstatic_oop_offset +
(nonstatic_oop_count * heapOopSize);
}
}
if( allocation_style == 2 ) {
allocation_style = 1; // allocate oops last
next_nonstatic_double_offset = next_nonstatic_field_offset;
}
} else {
ShouldNotReachHere();
}
int nonstatic_oop_space_count = 0;
int nonstatic_word_space_count = 0;
int nonstatic_short_space_count = 0;
int nonstatic_byte_space_count = 0;
int nonstatic_oop_space_offset = 0;
int nonstatic_word_space_offset = 0;
int nonstatic_short_space_offset = 0;
int nonstatic_byte_space_offset = 0;
// Try to squeeze some of the fields into the gaps due to
// long/double alignment.
if( nonstatic_double_count > 0 ) {
int offset = next_nonstatic_double_offset;
next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
if( compact_fields && offset != next_nonstatic_double_offset ) {
// Allocate available fields into the gap before double field.
int length = next_nonstatic_double_offset - offset;
assert(length == BytesPerInt, "");
nonstatic_word_space_offset = offset;
if( nonstatic_word_count > 0 ) {
nonstatic_word_count -= 1;
nonstatic_word_space_count = 1; // Only one will fit
length -= BytesPerInt;
offset += BytesPerInt;
}
nonstatic_short_space_offset = offset;
while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
nonstatic_short_count -= 1;
nonstatic_short_space_count += 1;
length -= BytesPerShort;
offset += BytesPerShort;
}
nonstatic_byte_space_offset = offset;
while( length > 0 && nonstatic_byte_count > 0 ) {
nonstatic_byte_count -= 1;
nonstatic_byte_space_count += 1;
length -= 1;
}
// Allocate oop field in the gap if there are no other fields for that.
nonstatic_oop_space_offset = offset;
if( length >= heapOopSize && nonstatic_oop_count > 0 &&
allocation_style != 0 ) { // when oop fields not first
nonstatic_oop_count -= 1;
nonstatic_oop_space_count = 1; // Only one will fit
length -= heapOopSize;
offset += heapOopSize;
}
}
}
next_nonstatic_word_offset = next_nonstatic_double_offset +
(nonstatic_double_count * BytesPerLong);
next_nonstatic_short_offset = next_nonstatic_word_offset +
(nonstatic_word_count * BytesPerInt);
next_nonstatic_byte_offset = next_nonstatic_short_offset +
(nonstatic_short_count * BytesPerShort);
next_nonstatic_padded_offset = next_nonstatic_byte_offset +
nonstatic_byte_count;
// let oops jump before padding with this allocation style
if( allocation_style == 1 ) {
next_nonstatic_oop_offset = next_nonstatic_padded_offset;
if( nonstatic_oop_count > 0 ) {
next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
}
next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
}
// Iterate over fields again and compute correct offsets.
// The field allocation type was temporarily stored in the offset slot.
// oop fields are located before non-oop fields (static and non-static).
for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
// contended instance fields are handled below
if (fs.is_contended() && !fs.access_flags().is_static()) continue;
int real_offset = 0;
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
// pack the rest of the fields
switch (atype) {
case STATIC_OOP:
real_offset = next_static_oop_offset;
next_static_oop_offset += heapOopSize;
break;
case STATIC_BYTE:
real_offset = next_static_byte_offset;
next_static_byte_offset += 1;
break;
case STATIC_SHORT:
real_offset = next_static_short_offset;
next_static_short_offset += BytesPerShort;
break;
case STATIC_WORD:
real_offset = next_static_word_offset;
next_static_word_offset += BytesPerInt;
break;
case STATIC_DOUBLE:
real_offset = next_static_double_offset;
next_static_double_offset += BytesPerLong;
break;
case NONSTATIC_OOP:
if( nonstatic_oop_space_count > 0 ) {
real_offset = nonstatic_oop_space_offset;
nonstatic_oop_space_offset += heapOopSize;
nonstatic_oop_space_count -= 1;
} else {
real_offset = next_nonstatic_oop_offset;
next_nonstatic_oop_offset += heapOopSize;
}
// Update oop maps
if( nonstatic_oop_map_count > 0 &&
nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
real_offset -
int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
heapOopSize ) {
// Extend current oop map
assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
} else {
// Create new oop map
assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
nonstatic_oop_map_count += 1;
if( first_nonstatic_oop_offset == 0 ) { // Undefined
first_nonstatic_oop_offset = real_offset;
}
}
break;
case NONSTATIC_BYTE:
if( nonstatic_byte_space_count > 0 ) {
real_offset = nonstatic_byte_space_offset;
nonstatic_byte_space_offset += 1;
nonstatic_byte_space_count -= 1;
} else {
real_offset = next_nonstatic_byte_offset;
next_nonstatic_byte_offset += 1;
}
break;
case NONSTATIC_SHORT:
if( nonstatic_short_space_count > 0 ) {
real_offset = nonstatic_short_space_offset;
nonstatic_short_space_offset += BytesPerShort;
nonstatic_short_space_count -= 1;
} else {
real_offset = next_nonstatic_short_offset;
next_nonstatic_short_offset += BytesPerShort;
}
break;
case NONSTATIC_WORD:
if( nonstatic_word_space_count > 0 ) {
real_offset = nonstatic_word_space_offset;
nonstatic_word_space_offset += BytesPerInt;
nonstatic_word_space_count -= 1;
} else {
real_offset = next_nonstatic_word_offset;
next_nonstatic_word_offset += BytesPerInt;
}
break;
case NONSTATIC_DOUBLE:
real_offset = next_nonstatic_double_offset;
next_nonstatic_double_offset += BytesPerLong;
break;
default:
ShouldNotReachHere();
}
fs.set_offset(real_offset);
}
// Handle the contended cases.
//
// Each contended field should not intersect the cache line with another contended field.
// In the absence of alignment information, we end up with pessimistically separating
// the fields with full-width padding.
//
// Additionally, this should not break alignment for the fields, so we round the alignment up
// for each field.
if (nonstatic_contended_count > 0) {
// if there is at least one contended field, we need to have pre-padding for them
next_nonstatic_padded_offset += ContendedPaddingWidth;
// collect all contended groups
BitMap bm(_cp->size());
for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
if (fs.is_contended()) {
bm.set_bit(fs.contended_group());
}
}
int current_group = -1;
while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
// skip non-contended fields and fields from different group
if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
// handle statics below
if (fs.access_flags().is_static()) continue;
int real_offset = 0;
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
switch (atype) {
case NONSTATIC_BYTE:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += 1;
break;
case NONSTATIC_SHORT:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerShort;
break;
case NONSTATIC_WORD:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerInt;
break;
case NONSTATIC_DOUBLE:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerLong;
break;
case NONSTATIC_OOP:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += heapOopSize;
// Create new oop map
assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
nonstatic_oop_map_count += 1;
if( first_nonstatic_oop_offset == 0 ) { // Undefined
first_nonstatic_oop_offset = real_offset;
}
break;
default:
ShouldNotReachHere();
}
if (fs.contended_group() == 0) {
// Contended group defines the equivalence class over the fields:
// the fields within the same contended group are not inter-padded.
// The only exception is default group, which does not incur the
// equivalence, and so requires intra-padding.
next_nonstatic_padded_offset += ContendedPaddingWidth;
}
fs.set_offset(real_offset);
} // for
// Start laying out the next group.
// Note that this will effectively pad the last group in the back;
// this is expected to alleviate memory contention effects for
// subclass fields and/or adjacent object.
// If this was the default group, the padding is already in place.
if (current_group != 0) {
next_nonstatic_padded_offset += ContendedPaddingWidth;
}
}
// handle static fields
}
// Entire class is contended, pad in the back.
// This helps to alleviate memory contention effects for subclass fields
// and/or adjacent object.
if (is_contended_class) {
next_nonstatic_padded_offset += ContendedPaddingWidth;
}
int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
int static_field_size = (static_fields_end -
InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
nonstatic_field_size = nonstatic_field_size +
(nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
int instance_size = align_object_size(instance_end / wordSize);
assert(instance_size == align_object_size(align_size_up(
(instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
wordSize) / wordSize), "consistent layout helper value");
// Invariant: nonstatic_field end/start should only change if there are
// nonstatic fields in the class, or if the class is contended. We compare
// against the non-aligned value, so that end alignment will not fail the
// assert without actually having the fields.
assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
is_contended_class ||
(nonstatic_fields_count > 0), "double-check nonstatic start/end");
// Number of non-static oop map blocks allocated at end of klass.
const unsigned int total_oop_map_count =
compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
first_nonstatic_oop_offset);
#ifndef PRODUCT
if (PrintFieldLayout) {
print_field_layout(_class_name,
_fields,
_cp,
instance_size,
nonstatic_fields_start,
nonstatic_fields_end,
static_fields_end);
}
#endif
// Pass back information needed for InstanceKlass creation
info->nonstatic_oop_offsets = nonstatic_oop_offsets;
info->nonstatic_oop_counts = nonstatic_oop_counts;
info->nonstatic_oop_map_count = nonstatic_oop_map_count;
info->total_oop_map_count = total_oop_map_count;
info->instance_size = instance_size;
info->static_field_size = static_field_size;
info->nonstatic_field_size = nonstatic_field_size;
info->has_nonstatic_fields = has_nonstatic_fields;
}
instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
ClassLoaderData* loader_data,
Handle protection_domain,
KlassHandle host_klass,
GrowableArray<Handle>* cp_patches,
TempNewSymbol& parsed_name,
bool verify,
TRAPS) {
// When a retransformable agent is attached, JVMTI caches the
// class bytes that existed before the first retransformation.
// If RedefineClasses() was used before the retransformable
// agent attached, then the cached class bytes may not be the
// original class bytes.
JvmtiCachedClassFileData *cached_class_file = NULL;
Handle class_loader(THREAD, loader_data->class_loader());
bool has_default_methods = false;
bool declares_default_methods = false;
ResourceMark rm(THREAD);
ClassFileStream* cfs = stream();
// Timing
assert(THREAD->is_Java_thread(), "must be a JavaThread");
JavaThread* jt = (JavaThread*) THREAD;
PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
ClassLoader::perf_class_parse_selftime(),
NULL,
jt->get_thread_stat()->perf_recursion_counts_addr(),
jt->get_thread_stat()->perf_timers_addr(),
PerfClassTraceTime::PARSE_CLASS);
init_parsed_class_attributes(loader_data);
if (JvmtiExport::should_post_class_file_load_hook()) {
// Get the cached class file bytes (if any) from the class that
// is being redefined or retransformed. We use jvmti_thread_state()
// instead of JvmtiThreadState::state_for(jt) so we don't allocate
// a JvmtiThreadState any earlier than necessary. This will help
// avoid the bug described by 7126851.
JvmtiThreadState *state = jt->jvmti_thread_state();
if (state != NULL) {
KlassHandle *h_class_being_redefined =
state->get_class_being_redefined();
if (h_class_being_redefined != NULL) {
instanceKlassHandle ikh_class_being_redefined =
instanceKlassHandle(THREAD, (*h_class_being_redefined)());
cached_class_file = ikh_class_being_redefined->get_cached_class_file();
}
}
unsigned char* ptr = cfs->buffer();
unsigned char* end_ptr = cfs->buffer() + cfs->length();
JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
&ptr, &end_ptr, &cached_class_file);
if (ptr != cfs->buffer()) {
// JVMTI agent has modified class file data.
// Set new class file stream using JVMTI agent modified
// class file data.
cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
set_stream(cfs);
}
}
_host_klass = host_klass;
_cp_patches = cp_patches;
instanceKlassHandle nullHandle;
// Figure out whether we can skip format checking (matching classic VM behavior)
if (DumpSharedSpaces) {
// verify == true means it's a 'remote' class (i.e., non-boot class)
// Verification decision is based on BytecodeVerificationRemote flag
// for those classes.
_need_verify = (verify) ? BytecodeVerificationRemote :
BytecodeVerificationLocal;
} else {
_need_verify = Verifier::should_verify_for(class_loader(), verify);
}
// Set the verify flag in stream
cfs->set_verify(_need_verify);
// Save the class file name for easier error message printing.
_class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor
// Magic value
u4 magic = cfs->get_u4_fast();
guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
"Incompatible magic value %u in class file %s",
magic, CHECK_(nullHandle));
// Version numbers
u2 minor_version = cfs->get_u2_fast();
u2 major_version = cfs->get_u2_fast();
if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
ResourceMark rm;
warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
major_version, minor_version, name->as_C_string());
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"Unsupported major.minor version for dump time %u.%u",
major_version,
minor_version);
}
// Check version numbers - we check this even with verifier off
if (!is_supported_version(major_version, minor_version)) {
if (name == NULL) {
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"Unsupported class file version %u.%u, "
"this version of the Java Runtime only recognizes class file versions up to %u.%u",
major_version,
minor_version,
JAVA_MAX_SUPPORTED_VERSION,
JAVA_MAX_SUPPORTED_MINOR_VERSION);
} else {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
"this version of the Java Runtime only recognizes class file versions up to %u.%u",
name->as_C_string(),
major_version,
minor_version,
JAVA_MAX_SUPPORTED_VERSION,
JAVA_MAX_SUPPORTED_MINOR_VERSION);
}
return nullHandle;
}
_major_version = major_version;
_minor_version = minor_version;
// Check if verification needs to be relaxed for this class file
// Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
_relax_verify = Verifier::relax_verify_for(class_loader());
// Constant pool
constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
int cp_size = cp->length();
cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len
// Access flags
AccessFlags access_flags;
jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
// Set abstract bit for old class files for backward compatibility
flags |= JVM_ACC_ABSTRACT;
}
verify_legal_class_modifiers(flags, CHECK_(nullHandle));
access_flags.set_flags(flags);
// This class and superclass
u2 this_class_index = cfs->get_u2_fast();
check_property(
valid_cp_range(this_class_index, cp_size) &&
cp->tag_at(this_class_index).is_unresolved_klass(),
"Invalid this class index %u in constant pool in class file %s",
this_class_index, CHECK_(nullHandle));
Symbol* class_name = cp->unresolved_klass_at(this_class_index);
assert(class_name != NULL, "class_name can't be null");
// It's important to set parsed_name *before* resolving the super class.
// (it's used for cleanup by the caller if parsing fails)
parsed_name = class_name;
// parsed_name is returned and can be used if there's an error, so add to
// its reference count. Caller will decrement the refcount.
parsed_name->increment_refcount();
// Update _class_name which could be null previously to be class_name
_class_name = class_name;
// Don't need to check whether this class name is legal or not.
// It has been checked when constant pool is parsed.
// However, make sure it is not an array type.
if (_need_verify) {
guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
"Bad class name in class file %s",
CHECK_(nullHandle));
}
Klass* preserve_this_klass; // for storing result across HandleMark
// release all handles when parsing is done
{ HandleMark hm(THREAD);
// Checks if name in class file matches requested name
if (name != NULL && class_name != name) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_NoClassDefFoundError(),
"%s (wrong name: %s)",
name->as_C_string(),
class_name->as_C_string()
);
return nullHandle;
}
if (TraceClassLoadingPreorder) {
tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
tty->print_cr("]");
}
#if INCLUDE_CDS
if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
// Only dump the classes that can be stored into CDS archive
if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
if (name != NULL) {
ResourceMark rm(THREAD);
classlist_file->print_cr("%s", name->as_C_string());
classlist_file->flush();
}
}
}
#endif
u2 super_class_index = cfs->get_u2_fast();
instanceKlassHandle super_klass = parse_super_class(super_class_index,
CHECK_NULL);
// Interfaces
u2 itfs_len = cfs->get_u2_fast();
Array<Klass*>* local_interfaces =
parse_interfaces(itfs_len, protection_domain, _class_name,
&has_default_methods, CHECK_(nullHandle));
u2 java_fields_count = 0;
// Fields (offsets are filled in later)
FieldAllocationCount fac;
Array<u2>* fields = parse_fields(class_name,
access_flags.is_interface(),
&fac, &java_fields_count,
CHECK_(nullHandle));
// Methods
bool has_final_method = false;
AccessFlags promoted_flags;
promoted_flags.set_flags(0);
Array<Method*>* methods = parse_methods(access_flags.is_interface(),
&promoted_flags,
&has_final_method,
&declares_default_methods,
CHECK_(nullHandle));
if (declares_default_methods) {
has_default_methods = true;
}
// Additional attributes
ClassAnnotationCollector parsed_annotations;
parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
// Finalize the Annotations metadata object,
// now that all annotation arrays have been created.
create_combined_annotations(CHECK_(nullHandle));
// Make sure this is the end of class file stream
guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
if (_class_name == vmSymbols::java_lang_Object()) {
check_property(_local_interfaces == Universe::the_empty_klass_array(),
"java.lang.Object cannot implement an interface in class file %s",
CHECK_(nullHandle));
}
// We check super class after class file is parsed and format is checked
if (super_class_index > 0 && super_klass.is_null()) {
Symbol* sk = cp->klass_name_at(super_class_index);
if (access_flags.is_interface()) {
// Before attempting to resolve the superclass, check for class format
// errors not checked yet.
guarantee_property(sk == vmSymbols::java_lang_Object(),
"Interfaces must have java.lang.Object as superclass in class file %s",
CHECK_(nullHandle));
}
Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
class_loader,
protection_domain,
true,
CHECK_(nullHandle));
KlassHandle kh (THREAD, k);
super_klass = instanceKlassHandle(THREAD, kh());
}
if (super_klass.not_null()) {
if (super_klass->has_default_methods()) {
has_default_methods = true;
}
if (super_klass->is_interface()) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IncompatibleClassChangeError(),
"class %s has interface %s as super class",
class_name->as_klass_external_name(),
super_klass->external_name()
);
return nullHandle;
}
// Make sure super class is not final
if (super_klass->is_final()) {
THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
}
}
// save super klass for error handling.
_super_klass = super_klass;
// Compute the transitive list of all unique interfaces implemented by this class
_transitive_interfaces =
compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
// sort methods
intArray* method_ordering = sort_methods(methods);
// promote flags from parse_methods() to the klass' flags
access_flags.add_promoted_flags(promoted_flags.as_int());
// Size of Java vtable (in words)
int vtable_size = 0;
int itable_size = 0;
int num_miranda_methods = 0;
GrowableArray<Method*> all_mirandas(20);
klassVtable::compute_vtable_size_and_num_mirandas(
&vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
access_flags, class_loader, class_name, local_interfaces,
CHECK_(nullHandle));
// Size of Java itable (in words)
itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
FieldLayoutInfo info;
layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
int total_oop_map_size2 =
InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
// Compute reference type
ReferenceType rt;
if (super_klass() == NULL) {
rt = REF_NONE;
} else {
rt = super_klass->reference_type();
}
// We can now create the basic Klass* for this klass
_klass = InstanceKlass::allocate_instance_klass(loader_data,
vtable_size,
itable_size,
info.static_field_size,
total_oop_map_size2,
rt,
access_flags,
name,
super_klass(),
!host_klass.is_null(),
CHECK_(nullHandle));
instanceKlassHandle this_klass (THREAD, _klass);
assert(this_klass->static_field_size() == info.static_field_size, "sanity");
assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
"sanity");
// Fill in information already parsed
this_klass->set_should_verify_class(verify);
jint lh = Klass::instance_layout_helper(info.instance_size, false);
this_klass->set_layout_helper(lh);
assert(this_klass->oop_is_instance(), "layout is correct");
assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
// Not yet: supers are done below to support the new subtype-checking fields
//this_klass->set_super(super_klass());
this_klass->set_class_loader_data(loader_data);
this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
if (has_final_method) {
this_klass->set_has_final_method();
}
this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
// The InstanceKlass::_methods_jmethod_ids cache
// is managed on the assumption that the initial cache
// size is equal to the number of methods in the class. If
// that changes, then InstanceKlass::idnum_can_increment()
// has to be changed accordingly.
this_klass->set_initial_method_idnum(methods->length());
this_klass->set_name(cp->klass_name_at(this_class_index));
if (is_anonymous()) // I am well known to myself
cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
this_klass->set_minor_version(minor_version);
this_klass->set_major_version(major_version);
this_klass->set_has_default_methods(has_default_methods);
this_klass->set_declares_default_methods(declares_default_methods);
if (!host_klass.is_null()) {
assert (this_klass->is_anonymous(), "should be the same");
this_klass->set_host_klass(host_klass());
}
// Set up Method*::intrinsic_id as soon as we know the names of methods.
// (We used to do this lazily, but now we query it in Rewriter,
// which is eagerly done for every method, so we might as well do it now,
// when everything is fresh in memory.)
if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
for (int j = 0; j < methods->length(); j++) {
methods->at(j)->init_intrinsic_id();
}
}
if (cached_class_file != NULL) {
// JVMTI: we have an InstanceKlass now, tell it about the cached bytes
this_klass->set_cached_class_file(cached_class_file);
}
// Fill in field values obtained by parse_classfile_attributes
if (parsed_annotations.has_any_annotations())
parsed_annotations.apply_to(this_klass);
apply_parsed_class_attributes(this_klass);
// Miranda methods
if ((num_miranda_methods > 0) ||
// if this class introduced new miranda methods or
(super_klass.not_null() && (super_klass->has_miranda_methods()))
// super class exists and this class inherited miranda methods
) {
this_klass->set_has_miranda_methods(); // then set a flag
}
// Fill in information needed to compute superclasses.
this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
// Initialize itable offset tables
klassItable::setup_itable_offset_table(this_klass);
// Compute transitive closure of interfaces this class implements
// Do final class setup
fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
// Fill in has_finalizer, has_vanilla_constructor, and layout_helper
set_precomputed_flags(this_klass);
// reinitialize modifiers, using the InnerClasses attribute
int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
this_klass->set_modifier_flags(computed_modifiers);
// check if this class can access its super class
check_super_class_access(this_klass, CHECK_(nullHandle));
// check if this class can access its superinterfaces
check_super_interface_access(this_klass, CHECK_(nullHandle));
// check if this class overrides any final method
check_final_method_override(this_klass, CHECK_(nullHandle));
// check that if this class is an interface then it doesn't have static methods
if (this_klass->is_interface()) {
/* An interface in a JAVA 8 classfile can be static */
if (_major_version < JAVA_8_VERSION) {
check_illegal_static_method(this_klass, CHECK_(nullHandle));
}
}
// Allocate mirror and initialize static fields
java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
CHECK_(nullHandle));
// Generate any default methods - default methods are interface methods
// that have a default implementation. This is new with Lambda project.
if (has_default_methods ) {
DefaultMethods::generate_default_methods(
this_klass(), &all_mirandas, CHECK_(nullHandle));
}
// Update the loader_data graph.
record_defined_class_dependencies(this_klass, CHECK_NULL);
ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
false /* not shared class */);
if (TraceClassLoading) {
ResourceMark rm;
// print in a single call to reduce interleaving of output
if (cfs->source() != NULL) {
tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
cfs->source());
} else if (class_loader.is_null()) {
Klass* caller =
THREAD->is_Java_thread()
? ((JavaThread*)THREAD)->security_get_caller_class(1)
: NULL;
// caller can be NULL, for example, during a JVMTI VM_Init hook
if (caller != NULL) {
tty->print("[Loaded %s by instance of %s]\n",
this_klass->external_name(),
InstanceKlass::cast(caller)->external_name());
} else {
tty->print("[Loaded %s]\n", this_klass->external_name());
}
} else {
tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
InstanceKlass::cast(class_loader->klass())->external_name());
}
}
if (TraceClassResolution) {
ResourceMark rm;
// print out the superclass.
const char * from = this_klass()->external_name();
if (this_klass->java_super() != NULL) {
tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
}
// print out each of the interface classes referred to by this class.
Array<Klass*>* local_interfaces = this_klass->local_interfaces();
if (local_interfaces != NULL) {
int length = local_interfaces->length();
for (int i = 0; i < length; i++) {
Klass* k = local_interfaces->at(i);
InstanceKlass* to_class = InstanceKlass::cast(k);
const char * to = to_class->external_name();
tty->print("RESOLVE %s %s (interface)\n", from, to);
}
}
}
// preserve result across HandleMark
preserve_this_klass = this_klass();
}
// Create new handle outside HandleMark (might be needed for
// Extended Class Redefinition)
instanceKlassHandle this_klass (THREAD, preserve_this_klass);
debug_only(this_klass->verify();)
// Clear class if no error has occurred so destructor doesn't deallocate it
_klass = NULL;
return this_klass;
}
// Destructor to clean up if there's an error
ClassFileParser::~ClassFileParser() {
MetadataFactory::free_metadata(_loader_data, _cp);
MetadataFactory::free_array<u2>(_loader_data, _fields);
// Free methods
InstanceKlass::deallocate_methods(_loader_data, _methods);
// beware of the Universe::empty_blah_array!!
if (_inner_classes != Universe::the_empty_short_array()) {
MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
}
// Free interfaces
InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
_local_interfaces, _transitive_interfaces);
if (_combined_annotations != NULL) {
// After all annotations arrays have been created, they are installed into the
// Annotations object that will be assigned to the InstanceKlass being created.
// Deallocate the Annotations object and the installed annotations arrays.
_combined_annotations->deallocate_contents(_loader_data);
// If the _combined_annotations pointer is non-NULL,
// then the other annotations fields should have been cleared.
assert(_annotations == NULL, "Should have been cleared");
assert(_type_annotations == NULL, "Should have been cleared");
assert(_fields_annotations == NULL, "Should have been cleared");
assert(_fields_type_annotations == NULL, "Should have been cleared");
} else {
// If the annotations arrays were not installed into the Annotations object,
// then they have to be deallocated explicitly.
MetadataFactory::free_array<u1>(_loader_data, _annotations);
MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
Annotations::free_contents(_loader_data, _fields_annotations);
Annotations::free_contents(_loader_data, _fields_type_annotations);
}
clear_class_metadata();
// deallocate the klass if already created. Don't directly deallocate, but add
// to the deallocate list so that the klass is removed from the CLD::_klasses list
// at a safepoint.
if (_klass != NULL) {
_loader_data->add_to_deallocate_list(_klass);
}
_klass = NULL;
}
void ClassFileParser::print_field_layout(Symbol* name,
Array<u2>* fields,
constantPoolHandle cp,
int instance_size,
int instance_fields_start,
int instance_fields_end,
int static_fields_end) {
tty->print("%s: field layout\n", name->as_klass_external_name());
tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
if (!fs.access_flags().is_static()) {
tty->print(" @%3d \"%s\" %s\n",
fs.offset(),
fs.name()->as_klass_external_name(),
fs.signature()->as_klass_external_name());
}
}
tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
if (fs.access_flags().is_static()) {
tty->print(" @%3d \"%s\" %s\n",
fs.offset(),
fs.name()->as_klass_external_name(),
fs.signature()->as_klass_external_name());
}
}
tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
tty->print("\n");
}
unsigned int
ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
unsigned int nonstatic_oop_map_count,
int first_nonstatic_oop_offset) {
unsigned int map_count =
super.is_null() ? 0 : super->nonstatic_oop_map_count();
if (nonstatic_oop_map_count > 0) {
// We have oops to add to map
if (map_count == 0) {
map_count = nonstatic_oop_map_count;
} else {
// Check whether we should add a new map block or whether the last one can
// be extended
OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
OopMapBlock* const last_map = first_map + map_count - 1;
int next_offset = last_map->offset() + last_map->count() * heapOopSize;
if (next_offset == first_nonstatic_oop_offset) {
// There is no gap bettwen superklass's last oop field and first
// local oop field, merge maps.
nonstatic_oop_map_count -= 1;
} else {
// Superklass didn't end with a oop field, add extra maps
assert(next_offset < first_nonstatic_oop_offset, "just checking");
}
map_count += nonstatic_oop_map_count;
}
}
return map_count;
}
void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
unsigned int nonstatic_oop_map_count,
int* nonstatic_oop_offsets,
unsigned int* nonstatic_oop_counts) {
OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
const InstanceKlass* const super = k->superklass();
const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
if (super_count > 0) {
// Copy maps from superklass
OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
for (unsigned int i = 0; i < super_count; ++i) {
*this_oop_map++ = *super_oop_map++;
}
}
if (nonstatic_oop_map_count > 0) {
if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
// The counts differ because there is no gap between superklass's last oop
// field and the first local oop field. Extend the last oop map copied
// from the superklass instead of creating new one.
nonstatic_oop_map_count--;
nonstatic_oop_offsets++;
this_oop_map--;
this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
this_oop_map++;
}
// Add new map blocks, fill them
while (nonstatic_oop_map_count-- > 0) {
this_oop_map->set_offset(*nonstatic_oop_offsets++);
this_oop_map->set_count(*nonstatic_oop_counts++);
this_oop_map++;
}
assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
this_oop_map, "sanity");
}
}
void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
Klass* super = k->super();
// Check if this klass has an empty finalize method (i.e. one with return bytecode only),
// in which case we don't have to register objects as finalizable
if (!_has_empty_finalizer) {
if (_has_finalizer ||
(super != NULL && super->has_finalizer())) {
k->set_has_finalizer();
}
}
#ifdef ASSERT
bool f = false;
Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
vmSymbols::void_method_signature());
if (m != NULL && !m->is_empty_method()) {
f = true;
}
// Spec doesn't prevent agent from redefinition of empty finalizer.
// Despite the fact that it's generally bad idea and redefined finalizer
// will not work as expected we shouldn't abort vm in this case
if (!k->has_redefined_this_or_super()) {
assert(f == k->has_finalizer(), "inconsistent has_finalizer");
}
#endif
// Check if this klass supports the java.lang.Cloneable interface
if (SystemDictionary::Cloneable_klass_loaded()) {
if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
k->set_is_cloneable();
}
}
// Check if this klass has a vanilla default constructor
if (super == NULL) {
// java.lang.Object has empty default constructor
k->set_has_vanilla_constructor();
} else {
if (super->has_vanilla_constructor() &&
_has_vanilla_constructor) {
k->set_has_vanilla_constructor();
}
#ifdef ASSERT
bool v = false;
if (super->has_vanilla_constructor()) {
Method* constructor = k->find_method(vmSymbols::object_initializer_name(
), vmSymbols::void_method_signature());
if (constructor != NULL && constructor->is_vanilla_constructor()) {
v = true;
}
}
assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
#endif
}
// If it cannot be fast-path allocated, set a bit in the layout helper.
// See documentation of InstanceKlass::can_be_fastpath_allocated().
assert(k->size_helper() > 0, "layout_helper is initialized");
if ((!RegisterFinalizersAtInit && k->has_finalizer())
|| k->is_abstract() || k->is_interface()
|| (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
|| k->size_helper() >= FastAllocateSizeLimit) {
// Forbid fast-path allocation.
jint lh = Klass::instance_layout_helper(k->size_helper(), true);
k->set_layout_helper(lh);
}
}
// Attach super classes and interface classes to class loader data
void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
if (defining_loader_data->is_the_null_class_loader_data()) {
// Dependencies to null class loader data are implicit.
return;
} else {
// add super class dependency
Klass* super = defined_klass->super();
if (super != NULL) {
defining_loader_data->record_dependency(super, CHECK);
}
// add super interface dependencies
Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
if (local_interfaces != NULL) {
int length = local_interfaces->length();
for (int i = 0; i < length; i++) {
defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
}
}
}
}
// utility methods for appending an array with check for duplicates
void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
// iterate over new interfaces
for (int i = 0; i < ifs->length(); i++) {
Klass* e = ifs->at(i);
assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
// add new interface
result->append_if_missing(e);
}
}
Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
instanceKlassHandle super,
Array<Klass*>* local_ifs, TRAPS) {
// Compute maximum size for transitive interfaces
int max_transitive_size = 0;
int super_size = 0;
// Add superclass transitive interfaces size
if (super.not_null()) {
super_size = super->transitive_interfaces()->length();
max_transitive_size += super_size;
}
// Add local interfaces' super interfaces
int local_size = local_ifs->length();
for (int i = 0; i < local_size; i++) {
Klass* l = local_ifs->at(i);
max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
}
// Finally add local interfaces
max_transitive_size += local_size;
// Construct array
if (max_transitive_size == 0) {
// no interfaces, use canonicalized array
return Universe::the_empty_klass_array();
} else if (max_transitive_size == super_size) {
// no new local interfaces added, share superklass' transitive interface array
return super->transitive_interfaces();
} else if (max_transitive_size == local_size) {
// only local interfaces added, share local interface array
return local_ifs;
} else {
ResourceMark rm;
GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
// Copy down from superclass
if (super.not_null()) {
append_interfaces(result, super->transitive_interfaces());
}
// Copy down from local interfaces' superinterfaces
for (int i = 0; i < local_ifs->length(); i++) {
Klass* l = local_ifs->at(i);
append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
}
// Finally add local interfaces
append_interfaces(result, local_ifs);
// length will be less than the max_transitive_size if duplicates were removed
int length = result->length();
assert(length <= max_transitive_size, "just checking");
Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
for (int i = 0; i < length; i++) {
Klass* e = result->at(i);
assert(e != NULL, "just checking");
new_result->at_put(i, e);
}
return new_result;
}
}
void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
Klass* super = this_klass->super();
if ((super != NULL) &&
(!Reflection::verify_class_access(this_klass(), super, false))) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"class %s cannot access its superclass %s",
this_klass->external_name(),
InstanceKlass::cast(super)->external_name()
);
return;
}
}
void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
Array<Klass*>* local_interfaces = this_klass->local_interfaces();
int lng = local_interfaces->length();
for (int i = lng - 1; i >= 0; i--) {
Klass* k = local_interfaces->at(i);
assert (k != NULL && k->is_interface(), "invalid interface");
if (!Reflection::verify_class_access(this_klass(), k, false)) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"class %s cannot access its superinterface %s",
this_klass->external_name(),
InstanceKlass::cast(k)->external_name()
);
return;
}
}
}
void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
Array<Method*>* methods = this_klass->methods();
int num_methods = methods->length();
// go thru each method and check if it overrides a final method
for (int index = 0; index < num_methods; index++) {
Method* m = methods->at(index);
// skip private, static, and <init> methods
if ((!m->is_private() && !m->is_static()) &&
(m->name() != vmSymbols::object_initializer_name())) {
Symbol* name = m->name();
Symbol* signature = m->signature();
Klass* k = this_klass->super();
Method* super_m = NULL;
while (k != NULL) {
// skip supers that don't have final methods.
if (k->has_final_method()) {
// lookup a matching method in the super class hierarchy
super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
if (super_m == NULL) {
break; // didn't find any match; get out
}
if (super_m->is_final() && !super_m->is_static() &&
// matching method in super is final, and not static
(Reflection::verify_field_access(this_klass(),
super_m->method_holder(),
super_m->method_holder(),
super_m->access_flags(), false))
// this class can access super final method and therefore override
) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_VerifyError(),
"class %s overrides final method %s.%s",
this_klass->external_name(),
name->as_C_string(),
signature->as_C_string()
);
return;
}
// continue to look from super_m's holder's super.
k = super_m->method_holder()->super();
continue;
}
k = k->super();
}
}
}
}
// assumes that this_klass is an interface
void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
assert(this_klass->is_interface(), "not an interface");
Array<Method*>* methods = this_klass->methods();
int num_methods = methods->length();
for (int index = 0; index < num_methods; index++) {
Method* m = methods->at(index);
// if m is static and not the init method, throw a verify error
if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_VerifyError(),
"Illegal static method %s in interface %s",
m->name()->as_C_string(),
this_klass->external_name()
);
return;
}
}
}
// utility methods for format checking
void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
if (!_need_verify) { return; }
const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_super = (flags & JVM_ACC_SUPER) != 0;
const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
if ((is_abstract && is_final) ||
(is_interface && !is_abstract) ||
(is_interface && major_gte_15 && (is_super || is_enum)) ||
(!is_interface && major_gte_15 && is_annotation)) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal class modifiers in class %s: 0x%X",
_class_name->as_C_string(), flags
);
return;
}
}
bool ClassFileParser::has_illegal_visibility(jint flags) {
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
return ((is_public && is_protected) ||
(is_public && is_private) ||
(is_protected && is_private));
}
bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
u2 max_version =
JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
(JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
(major <= max_version) &&
((major != max_version) ||
(minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
}
void ClassFileParser::verify_legal_field_modifiers(
jint flags, bool is_interface, TRAPS) {
if (!_need_verify) { return; }
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
const bool is_static = (flags & JVM_ACC_STATIC) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
bool is_illegal = false;
if (is_interface) {
if (!is_public || !is_static || !is_final || is_private ||
is_protected || is_volatile || is_transient ||
(major_gte_15 && is_enum)) {
is_illegal = true;
}
} else { // not interface
if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
is_illegal = true;
}
}
if (is_illegal) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal field modifiers in class %s: 0x%X",
_class_name->as_C_string(), flags);
return;
}
}
void ClassFileParser::verify_legal_method_modifiers(
jint flags, bool is_interface, Symbol* name, TRAPS) {
if (!_need_verify) { return; }
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
const bool is_static = (flags & JVM_ACC_STATIC) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
const bool is_initializer = (name == vmSymbols::object_initializer_name());
bool is_illegal = false;
if (is_interface) {
if (major_gte_8) {
// Class file version is JAVA_8_VERSION or later Methods of
// interfaces may set any of the flags except ACC_PROTECTED,
// ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
// have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
(is_native || is_protected || is_final || is_synchronized) ||
// If a specific method of a class or interface has its
// ACC_ABSTRACT flag set, it must not have any of its
// ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
// ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
// check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
// those flags are illegal irrespective of ACC_ABSTRACT being set or not.
(is_abstract && (is_private || is_static || is_strict))) {
is_illegal = true;
}
} else if (major_gte_15) {
// Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
if (!is_public || is_static || is_final || is_synchronized ||
is_native || !is_abstract || is_strict) {
is_illegal = true;
}
} else {
// Class file version is pre-JAVA_1_5_VERSION
if (!is_public || is_static || is_final || is_native || !is_abstract) {
is_illegal = true;
}
}
} else { // not interface
if (is_initializer) {
if (is_static || is_final || is_synchronized || is_native ||
is_abstract || (major_gte_15 && is_bridge)) {
is_illegal = true;
}
} else { // not initializer
if (is_abstract) {
if ((is_final || is_native || is_private || is_static ||
(major_gte_15 && (is_synchronized || is_strict)))) {
is_illegal = true;
}
}
if (has_illegal_visibility(flags)) {
is_illegal = true;
}
}
}
if (is_illegal) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Method %s in class %s has illegal modifiers: 0x%X",
name->as_C_string(), _class_name->as_C_string(), flags);
return;
}
}
void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
assert(_need_verify, "only called when _need_verify is true");
int i = 0;
int count = length >> 2;
for (int k=0; k<count; k++) {
unsigned char b0 = buffer[i];
unsigned char b1 = buffer[i+1];
unsigned char b2 = buffer[i+2];
unsigned char b3 = buffer[i+3];
// For an unsigned char v,
// (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
// (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
unsigned char res = b0 | b0 - 1 |
b1 | b1 - 1 |
b2 | b2 - 1 |
b3 | b3 - 1;
if (res >= 128) break;
i += 4;
}
for(; i < length; i++) {
unsigned short c;
// no embedded zeros
guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
if(buffer[i] < 128) {
continue;
}
if ((i + 5) < length) { // see if it's legal supplementary character
if (UTF8::is_supplementary_character(&buffer[i])) {
c = UTF8::get_supplementary_character(&buffer[i]);
i += 5;
continue;
}
}
switch (buffer[i] >> 4) {
default: break;
case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
case 0xC: case 0xD: // 110xxxxx 10xxxxxx
c = (buffer[i] & 0x1F) << 6;
i++;
if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
c += buffer[i] & 0x3F;
if (_major_version <= 47 || c == 0 || c >= 0x80) {
// for classes with major > 47, c must a null or a character in its shortest form
break;
}
}
classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
c = (buffer[i] & 0xF) << 12;
i += 2;
if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
if (_major_version <= 47 || c >= 0x800) {
// for classes with major > 47, c must be in its shortest form
break;
}
}
classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
} // end of switch
} // end of for
}
// Checks if name is a legal class name.
void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
if (!_need_verify || _relax_verify) { return; }
char buf[fixed_buffer_size];
char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
char* p;
if (bytes[0] == JVM_SIGNATURE_ARRAY) {
p = skip_over_field_signature(bytes, false, length, CHECK);
legal = (p != NULL) && ((p - bytes) == (int)length);
} else if (_major_version < JAVA_1_5_VERSION) {
if (bytes[0] != '<') {
p = skip_over_field_name(bytes, true, length);
legal = (p != NULL) && ((p - bytes) == (int)length);
}
} else {
// 4900761: relax the constraints based on JSR202 spec
// Class names may be drawn from the entire Unicode character set.
// Identifiers between '/' must be unqualified names.
// The utf8 string has been verified when parsing cpool entries.
legal = verify_unqualified_name(bytes, length, LegalClass);
}
}
if (!legal) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal class name \"%s\" in class file %s", bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if name is a legal field name.
void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
if (!_need_verify || _relax_verify) { return; }
char buf[fixed_buffer_size];
char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
if (_major_version < JAVA_1_5_VERSION) {
if (bytes[0] != '<') {
char* p = skip_over_field_name(bytes, false, length);
legal = (p != NULL) && ((p - bytes) == (int)length);
}
} else {
// 4881221: relax the constraints based on JSR202 spec
legal = verify_unqualified_name(bytes, length, LegalField);
}
}
if (!legal) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal field name \"%s\" in class %s", bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if name is a legal method name.
void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
if (!_need_verify || _relax_verify) { return; }
assert(name != NULL, "method name is null");
char buf[fixed_buffer_size];
char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
if (bytes[0] == '<') {
if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
legal = true;
}
} else if (_major_version < JAVA_1_5_VERSION) {
char* p;
p = skip_over_field_name(bytes, false, length);
legal = (p != NULL) && ((p - bytes) == (int)length);
} else {
// 4881221: relax the constraints based on JSR202 spec
legal = verify_unqualified_name(bytes, length, LegalMethod);
}
}
if (!legal) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal method name \"%s\" in class %s", bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if signature is a legal field signature.
void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
if (!_need_verify) { return; }
char buf[fixed_buffer_size];
char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = signature->utf8_length();
char* p = skip_over_field_signature(bytes, false, length, CHECK);
if (p == NULL || (p - bytes) != (int)length) {
throwIllegalSignature("Field", name, signature, CHECK);
}
}
// Checks if signature is a legal method signature.
// Returns number of parameters
int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
if (!_need_verify) {
// make sure caller's args_size will be less than 0 even for non-static
// method so it will be recomputed in compute_size_of_parameters().
return -2;
}
unsigned int args_size = 0;
char buf[fixed_buffer_size];
char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = signature->utf8_length();
char* nextp;
// The first character must be a '('
if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
length--;
// Skip over legal field signatures
nextp = skip_over_field_signature(p, false, length, CHECK_0);
while ((length > 0) && (nextp != NULL)) {
args_size++;
if (p[0] == 'J' || p[0] == 'D') {
args_size++;
}
length -= nextp - p;
p = nextp;
nextp = skip_over_field_signature(p, false, length, CHECK_0);
}
// The first non-signature thing better be a ')'
if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
length--;
if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
// All internal methods must return void
if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
return args_size;
}
} else {
// Now we better just have a return value
nextp = skip_over_field_signature(p, true, length, CHECK_0);
if (nextp && ((int)length == (nextp - p))) {
return args_size;
}
}
}
}
// Report error
throwIllegalSignature("Method", name, signature, CHECK_0);
return 0;
}
// Unqualified names may not contain the characters '.', ';', '[', or '/'.
// Method names also may not contain the characters '<' or '>', unless <init>
// or <clinit>. Note that method names may not be <init> or <clinit> in this
// method. Because these names have been checked as special cases before
// calling this method in verify_legal_method_name.
bool ClassFileParser::verify_unqualified_name(
char* name, unsigned int length, int type) {
jchar ch;
for (char* p = name; p != name + length; ) {
ch = *p;
if (ch < 128) {
p++;
if (ch == '.' || ch == ';' || ch == '[' ) {
return false; // do not permit '.', ';', or '['
}
if (type != LegalClass && ch == '/') {
return false; // do not permit '/' unless it's class name
}
if (type == LegalMethod && (ch == '<' || ch == '>')) {
return false; // do not permit '<' or '>' in method names
}
} else {
char* tmp_p = UTF8::next(p, &ch);
p = tmp_p;
}
}
return true;
}
// Take pointer to a string. Skip over the longest part of the string that could
// be taken as a fieldname. Allow '/' if slash_ok is true.
// Return a pointer to just past the fieldname.
// Return NULL if no fieldname at all was found, or in the case of slash_ok
// being true, we saw consecutive slashes (meaning we were looking for a
// qualified path but found something that was badly-formed).
char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
char* p;
jchar ch;
jboolean last_is_slash = false;
jboolean not_first_ch = false;
for (p = name; p != name + length; not_first_ch = true) {
char* old_p = p;
ch = *p;
if (ch < 128) {
p++;
// quick check for ascii
if ((ch >= 'a' && ch <= 'z') ||
(ch >= 'A' && ch <= 'Z') ||
(ch == '_' || ch == '$') ||
(not_first_ch && ch >= '0' && ch <= '9')) {
last_is_slash = false;
continue;
}
if (slash_ok && ch == '/') {
if (last_is_slash) {
return NULL; // Don't permit consecutive slashes
}
last_is_slash = true;
continue;
}
} else {
jint unicode_ch;
char* tmp_p = UTF8::next_character(p, &unicode_ch);
p = tmp_p;
last_is_slash = false;
// Check if ch is Java identifier start or is Java identifier part
// 4672820: call java.lang.Character methods directly without generating separate tables.
EXCEPTION_MARK;
instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
// return value
JavaValue result(T_BOOLEAN);
// Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
JavaCallArguments args;
args.push_int(unicode_ch);
// public static boolean isJavaIdentifierStart(char ch);
JavaCalls::call_static(&result,
klass,
vmSymbols::isJavaIdentifierStart_name(),
vmSymbols::int_bool_signature(),
&args,
THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return 0;
}
if (result.get_jboolean()) {
continue;
}
if (not_first_ch) {
// public static boolean isJavaIdentifierPart(char ch);
JavaCalls::call_static(&result,
klass,
vmSymbols::isJavaIdentifierPart_name(),
vmSymbols::int_bool_signature(),
&args,
THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return 0;
}
if (result.get_jboolean()) {
continue;
}
}
}
return (not_first_ch) ? old_p : NULL;
}
return (not_first_ch) ? p : NULL;
}
// Take pointer to a string. Skip over the longest part of the string that could
// be taken as a field signature. Allow "void" if void_ok.
// Return a pointer to just past the signature.
// Return NULL if no legal signature is found.
char* ClassFileParser::skip_over_field_signature(char* signature,
bool void_ok,
unsigned int length,
TRAPS) {
unsigned int array_dim = 0;
while (length > 0) {
switch (signature[0]) {
case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
case JVM_SIGNATURE_BOOLEAN:
case JVM_SIGNATURE_BYTE:
case JVM_SIGNATURE_CHAR:
case JVM_SIGNATURE_SHORT:
case JVM_SIGNATURE_INT:
case JVM_SIGNATURE_FLOAT:
case JVM_SIGNATURE_LONG:
case JVM_SIGNATURE_DOUBLE:
return signature + 1;
case JVM_SIGNATURE_CLASS: {
if (_major_version < JAVA_1_5_VERSION) {
// Skip over the class name if one is there
char* p = skip_over_field_name(signature + 1, true, --length);
// The next character better be a semicolon
if (p && (p - signature) > 1 && p[0] == ';') {
return p + 1;
}
} else {
// 4900761: For class version > 48, any unicode is allowed in class name.
length--;
signature++;
while (length > 0 && signature[0] != ';') {
if (signature[0] == '.') {
classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
}
length--;
signature++;
}
if (signature[0] == ';') { return signature + 1; }
}
return NULL;
}
case JVM_SIGNATURE_ARRAY:
array_dim++;
if (array_dim > 255) {
// 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
}
// The rest of what's there better be a legal signature
signature++;
length--;
void_ok = false;
break;
default:
return NULL;
}
}
return NULL;
}