Mercurial > hg > truffle
diff src/cpu/x86/vm/icBuffer_x86.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/x86/vm/icBuffer_x86.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,66 @@ +/* + * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#include "incls/_precompiled.incl" +#include "incls/_icBuffer_x86.cpp.incl" + +int InlineCacheBuffer::ic_stub_code_size() { + return NativeMovConstReg::instruction_size + + NativeJump::instruction_size + + 1; + // so that code_end can be set in CodeBuffer + // 64bit 16 = 5 + 10 bytes + 1 byte + // 32bit 11 = 10 bytes + 1 byte +} + + + +void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, 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 oop, we do not need reloc info + // because + // (1) the oop is old (i.e., doesn't matter for scavenges) + // (2) these ICStubs are removed *before* a GC happens, so the roots disappear + assert(cached_oop == NULL || cached_oop->is_perm(), "must be perm oop"); + masm->lea(rax, OopAddress((address) cached_oop)); + 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 + NativeJump* jump = nativeJump_at(move->next_instruction_address()); + return jump->jump_destination(); +} + + +oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) { + // creation also verifies the object + NativeMovConstReg* move = nativeMovConstReg_at(code_begin); + // Verifies the jump + NativeJump* jump = nativeJump_at(move->next_instruction_address()); + return (oop)move->data(); +}