icBuffer_x86.cpp revision 1472
609N/A/*
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609N/A *
609N/A * This code is free software; you can redistribute it and/or modify it
609N/A * under the terms of the GNU General Public License version 2 only, as
609N/A * published by the Free Software Foundation.
609N/A *
609N/A * This code is distributed in the hope that it will be useful, but WITHOUT
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609N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
609N/A * version 2 for more details (a copy is included in the LICENSE file that
609N/A * accompanied this code).
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609N/A * You should have received a copy of the GNU General Public License version
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609N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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609N/A */
609N/A
609N/A#include "incls/_precompiled.incl"
609N/A#include "incls/_icBuffer_x86.cpp.incl"
609N/A
609N/Aint InlineCacheBuffer::ic_stub_code_size() {
609N/A return NativeMovConstReg::instruction_size +
609N/A NativeJump::instruction_size +
609N/A 1;
609N/A // so that code_end can be set in CodeBuffer
609N/A // 64bit 16 = 5 + 10 bytes + 1 byte
609N/A // 32bit 11 = 10 bytes + 1 byte
609N/A}
609N/A
609N/A
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();
}