| /* |
| * Copyright (c) 1997, 2014, 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 "asm/macroAssembler.inline.hpp" |
| #include "code/compiledIC.hpp" |
| #include "code/icBuffer.hpp" |
| #include "code/nmethod.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/safepoint.hpp" |
| |
| // Release the CompiledICHolder* associated with this call site is there is one. |
| void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { |
| // This call site might have become stale so inspect it carefully. |
| NativeCall* call = nativeCall_at(call_site->addr()); |
| if (is_icholder_entry(call->destination())) { |
| NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); |
| InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); |
| } |
| } |
| |
| bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { |
| // This call site might have become stale so inspect it carefully. |
| NativeCall* call = nativeCall_at(call_site->addr()); |
| return is_icholder_entry(call->destination()); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| #define __ _masm. |
| address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) { |
| // Stub is fixed up when the corresponding call is converted from |
| // calling compiled code to calling interpreted code. |
| // movq rbx, 0 |
| // jmp -5 # to self |
| |
| address mark = cbuf.insts_mark(); // Get mark within main instrs section. |
| |
| // Note that the code buffer's insts_mark is always relative to insts. |
| // That's why we must use the macroassembler to generate a stub. |
| MacroAssembler _masm(&cbuf); |
| |
| address base = __ start_a_stub(to_interp_stub_size()); |
| if (base == NULL) { |
| return NULL; // CodeBuffer::expand failed. |
| } |
| // Static stub relocation stores the instruction address of the call. |
| __ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand); |
| // Static stub relocation also tags the Method* in the code-stream. |
| __ mov_metadata(rbx, (Metadata*) NULL); // Method is zapped till fixup time. |
| // This is recognized as unresolved by relocs/nativeinst/ic code. |
| __ jump(RuntimeAddress(__ pc())); |
| |
| // Update current stubs pointer and restore insts_end. |
| __ end_a_stub(); |
| return base; |
| } |
| #undef __ |
| |
| int CompiledStaticCall::to_interp_stub_size() { |
| return NOT_LP64(10) // movl; jmp |
| LP64_ONLY(15); // movq (1+1+8); jmp (1+4) |
| } |
| |
| // Relocation entries for call stub, compiled java to interpreter. |
| int CompiledStaticCall::reloc_to_interp_stub() { |
| return 4; // 3 in emit_to_interp_stub + 1 in emit_call |
| } |
| |
| void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { |
| address stub = find_stub(); |
| guarantee(stub != NULL, "stub not found"); |
| |
| if (TraceICs) { |
| ResourceMark rm; |
| tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", |
| p2i(instruction_address()), |
| callee->name_and_sig_as_C_string()); |
| } |
| |
| // Creation also verifies the object. |
| NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); |
| NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
| |
| assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), |
| "a) MT-unsafe modification of inline cache"); |
| assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, |
| "b) MT-unsafe modification of inline cache"); |
| |
| // Update stub. |
| method_holder->set_data((intptr_t)callee()); |
| jump->set_jump_destination(entry); |
| |
| // Update jump to call. |
| set_destination_mt_safe(stub); |
| } |
| |
| void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { |
| assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
| // Reset stub. |
| address stub = static_stub->addr(); |
| assert(stub != NULL, "stub not found"); |
| // Creation also verifies the object. |
| NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); |
| NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
| method_holder->set_data(0); |
| jump->set_jump_destination((address)-1); |
| } |
| |
| //----------------------------------------------------------------------------- |
| // Non-product mode code |
| #ifndef PRODUCT |
| |
| void CompiledStaticCall::verify() { |
| // Verify call. |
| NativeCall::verify(); |
| if (os::is_MP()) { |
| verify_alignment(); |
| } |
| |
| // Verify stub. |
| address stub = find_stub(); |
| assert(stub != NULL, "no stub found for static call"); |
| // Creation also verifies the object. |
| NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); |
| NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
| |
| // Verify state. |
| assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); |
| } |
| |
| #endif // !PRODUCT |