| /* |
| * Copyright (c) 1997, 2015, 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.hpp" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "code/icBuffer.hpp" |
| #include "gc/shared/collectedHeap.inline.hpp" |
| #include "interpreter/bytecodes.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "nativeInst_x86.hpp" |
| #include "oops/oop.inline.hpp" |
| |
| int InlineCacheBuffer::ic_stub_code_size() { |
| // Worst case, if destination is not a near call: |
| // lea rax, lit1 |
| // lea scratch, lit2 |
| // jmp scratch |
| |
| // Best case |
| // lea rax, lit1 |
| // jmp lit2 |
| |
| int best = NativeMovConstReg::instruction_size + NativeJump::instruction_size; |
| int worst = 2 * NativeMovConstReg::instruction_size + 3; |
| return MAX2(best, worst); |
| } |
| |
| |
| |
| void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) { |
| ResourceMark rm; |
| CodeBuffer code(code_begin, ic_stub_code_size()); |
| MacroAssembler* masm = new MacroAssembler(&code); |
| // note: even though the code contains an embedded value, we do not need reloc info |
| // because |
| // (1) the value is old (i.e., doesn't matter for scavenges) |
| // (2) these ICStubs are removed *before* a GC happens, so the roots disappear |
| // assert(cached_value == NULL || cached_oop->is_perm(), "must be perm oop"); |
| masm->lea(rax, AddressLiteral((address) cached_value, relocInfo::metadata_type)); |
| masm->jump(ExternalAddress(entry_point)); |
| } |
| |
| |
| address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) { |
| NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object |
| address jmp = move->next_instruction_address(); |
| NativeInstruction* ni = nativeInstruction_at(jmp); |
| if (ni->is_jump()) { |
| NativeJump* jump = nativeJump_at(jmp); |
| return jump->jump_destination(); |
| } else { |
| assert(ni->is_far_jump(), "unexpected instruction"); |
| NativeFarJump* jump = nativeFarJump_at(jmp); |
| return jump->jump_destination(); |
| } |
| } |
| |
| |
| void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) { |
| // creation also verifies the object |
| NativeMovConstReg* move = nativeMovConstReg_at(code_begin); |
| // Verifies the jump |
| address jmp = move->next_instruction_address(); |
| NativeInstruction* ni = nativeInstruction_at(jmp); |
| if (ni->is_jump()) { |
| NativeJump* jump = nativeJump_at(jmp); |
| } else { |
| assert(ni->is_far_jump(), "unexpected instruction"); |
| NativeFarJump* jump = nativeFarJump_at(jmp); |
| } |
| void* o = (void*)move->data(); |
| return o; |
| } |