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// Copyright (c) 1994-2006 Sun Microsystems Inc.
// All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// - Redistribution in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the
// distribution.
//
// - Neither the name of Sun Microsystems or the names of contributors may
// be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
// The original source code covered by the above license above has been modified
// significantly by Google Inc.
// Copyright 2012 the V8 project authors. All rights reserved.
#include "src/v8.h"
#if V8_TARGET_ARCH_X87
#include "src/base/bits.h"
#include "src/base/cpu.h"
#include "src/disassembler.h"
#include "src/macro-assembler.h"
namespace v8 {
namespace internal {
// -----------------------------------------------------------------------------
// Implementation of CpuFeatures
void CpuFeatures::ProbeImpl(bool cross_compile) {
base::CPU cpu;
// Only use statically determined features for cross compile (snapshot).
if (cross_compile) return;
}
void CpuFeatures::PrintTarget() { }
void CpuFeatures::PrintFeatures() { }
// -----------------------------------------------------------------------------
// Implementation of Displacement
void Displacement::init(Label* L, Type type) {
DCHECK(!L->is_bound());
int next = 0;
if (L->is_linked()) {
next = L->pos();
DCHECK(next > 0); // Displacements must be at positions > 0
}
// Ensure that we _never_ overflow the next field.
DCHECK(NextField::is_valid(Assembler::kMaximalBufferSize));
data_ = NextField::encode(next) | TypeField::encode(type);
}
// -----------------------------------------------------------------------------
// Implementation of RelocInfo
const int RelocInfo::kApplyMask =
RelocInfo::kCodeTargetMask | 1 << RelocInfo::RUNTIME_ENTRY |
1 << RelocInfo::JS_RETURN | 1 << RelocInfo::INTERNAL_REFERENCE |
1 << RelocInfo::DEBUG_BREAK_SLOT | 1 << RelocInfo::CODE_AGE_SEQUENCE;
bool RelocInfo::IsCodedSpecially() {
// The deserializer needs to know whether a pointer is specially coded. Being
// specially coded on IA32 means that it is a relative address, as used by
// branch instructions. These are also the ones that need changing when a
// code object moves.
return (1 << rmode_) & kApplyMask;
}
bool RelocInfo::IsInConstantPool() {
return false;
}
// Patch the code at the current PC with a call to the target address.
// Additional guard int3 instructions can be added if required.
void RelocInfo::PatchCodeWithCall(Address target, int guard_bytes) {
// Call instruction takes up 5 bytes and int3 takes up one byte.
static const int kCallCodeSize = 5;
int code_size = kCallCodeSize + guard_bytes;
// Create a code patcher.
CodePatcher patcher(pc_, code_size);
// Add a label for checking the size of the code used for returning.
#ifdef DEBUG
Label check_codesize;
patcher.masm()->bind(&check_codesize);
#endif
// Patch the code.
patcher.masm()->call(target, RelocInfo::NONE32);
// Check that the size of the code generated is as expected.
DCHECK_EQ(kCallCodeSize,
patcher.masm()->SizeOfCodeGeneratedSince(&check_codesize));
// Add the requested number of int3 instructions after the call.
DCHECK_GE(guard_bytes, 0);
for (int i = 0; i < guard_bytes; i++) {
patcher.masm()->int3();
}
}
// -----------------------------------------------------------------------------
// Implementation of Operand
Operand::Operand(Register base, int32_t disp, RelocInfo::Mode rmode) {
// [base + disp/r]
if (disp == 0 && RelocInfo::IsNone(rmode) && !base.is(ebp)) {
// [base]
set_modrm(0, base);
if (base.is(esp)) set_sib(times_1, esp, base);
} else if (is_int8(disp) && RelocInfo::IsNone(rmode)) {
// [base + disp8]
set_modrm(1, base);
if (base.is(esp)) set_sib(times_1, esp, base);
set_disp8(disp);
} else {
// [base + disp/r]
set_modrm(2, base);
if (base.is(esp)) set_sib(times_1, esp, base);
set_dispr(disp, rmode);
}
}
Operand::Operand(Register base,
Register index,
ScaleFactor scale,
int32_t disp,
RelocInfo::Mode rmode) {
DCHECK(!index.is(esp)); // illegal addressing mode
// [base + index*scale + disp/r]
if (disp == 0 && RelocInfo::IsNone(rmode) && !base.is(ebp)) {
// [base + index*scale]
set_modrm(0, esp);
set_sib(scale, index, base);
} else if (is_int8(disp) && RelocInfo::IsNone(rmode)) {
// [base + index*scale + disp8]
set_modrm(1, esp);
set_sib(scale, index, base);
set_disp8(disp);
} else {
// [base + index*scale + disp/r]
set_modrm(2, esp);
set_sib(scale, index, base);
set_dispr(disp, rmode);
}
}
Operand::Operand(Register index,
ScaleFactor scale,
int32_t disp,
RelocInfo::Mode rmode) {
DCHECK(!index.is(esp)); // illegal addressing mode
// [index*scale + disp/r]
set_modrm(0, esp);
set_sib(scale, index, ebp);
set_dispr(disp, rmode);
}
bool Operand::is_reg(Register reg) const {
return ((buf_[0] & 0xF8) == 0xC0) // addressing mode is register only.
&& ((buf_[0] & 0x07) == reg.code()); // register codes match.
}
bool Operand::is_reg_only() const {
return (buf_[0] & 0xF8) == 0xC0; // Addressing mode is register only.
}
Register Operand::reg() const {
DCHECK(is_reg_only());
return Register::from_code(buf_[0] & 0x07);
}
// -----------------------------------------------------------------------------
// Implementation of Assembler.
// Emit a single byte. Must always be inlined.
#define EMIT(x) \
*pc_++ = (x)
#ifdef GENERATED_CODE_COVERAGE
static void InitCoverageLog();
#endif
Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
: AssemblerBase(isolate, buffer, buffer_size),
positions_recorder_(this) {
// Clear the buffer in debug mode unless it was provided by the
// caller in which case we can't be sure it's okay to overwrite
// existing code in it; see CodePatcher::CodePatcher(...).
#ifdef DEBUG
if (own_buffer_) {
memset(buffer_, 0xCC, buffer_size_); // int3
}
#endif
reloc_info_writer.Reposition(buffer_ + buffer_size_, pc_);
#ifdef GENERATED_CODE_COVERAGE
InitCoverageLog();
#endif
}
void Assembler::GetCode(CodeDesc* desc) {
// Finalize code (at this point overflow() may be true, but the gap ensures
// that we are still not overlapping instructions and relocation info).
reloc_info_writer.Finish();
DCHECK(pc_ <= reloc_info_writer.pos()); // No overlap.
// Set up code descriptor.
desc->buffer = buffer_;
desc->buffer_size = buffer_size_;
desc->instr_size = pc_offset();
desc->reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos();
desc->origin = this;
}
void Assembler::Align(int m) {
DCHECK(base::bits::IsPowerOfTwo32(m));
int mask = m - 1;
int addr = pc_offset();
Nop((m - (addr & mask)) & mask);
}
bool Assembler::IsNop(Address addr) {
Address a = addr;
while (*a == 0x66) a++;
if (*a == 0x90) return true;
if (a[0] == 0xf && a[1] == 0x1f) return true;
return false;
}
void Assembler::Nop(int bytes) {
EnsureSpace ensure_space(this);
// Older CPUs that do not support SSE2 may not support multibyte NOP
// instructions.
for (; bytes > 0; bytes--) {
EMIT(0x90);
}
return;
}
void Assembler::CodeTargetAlign() {
Align(16); // Preferred alignment of jump targets on ia32.
}
void Assembler::cpuid() {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xA2);
}
void Assembler::pushad() {
EnsureSpace ensure_space(this);
EMIT(0x60);
}
void Assembler::popad() {
EnsureSpace ensure_space(this);
EMIT(0x61);
}
void Assembler::pushfd() {
EnsureSpace ensure_space(this);
EMIT(0x9C);
}
void Assembler::popfd() {
EnsureSpace ensure_space(this);
EMIT(0x9D);
}
void Assembler::push(const Immediate& x) {
EnsureSpace ensure_space(this);
if (x.is_int8()) {
EMIT(0x6a);
EMIT(x.x_);
} else {
EMIT(0x68);
emit(x);
}
}
void Assembler::push_imm32(int32_t imm32) {
EnsureSpace ensure_space(this);
EMIT(0x68);
emit(imm32);
}
void Assembler::push(Register src) {
EnsureSpace ensure_space(this);
EMIT(0x50 | src.code());
}
void Assembler::push(const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0xFF);
emit_operand(esi, src);
}
void Assembler::pop(Register dst) {
DCHECK(reloc_info_writer.last_pc() != NULL);
EnsureSpace ensure_space(this);
EMIT(0x58 | dst.code());
}
void Assembler::pop(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0x8F);
emit_operand(eax, dst);
}
void Assembler::enter(const Immediate& size) {
EnsureSpace ensure_space(this);
EMIT(0xC8);
emit_w(size);
EMIT(0);
}
void Assembler::leave() {
EnsureSpace ensure_space(this);
EMIT(0xC9);
}
void Assembler::mov_b(Register dst, const Operand& src) {
CHECK(dst.is_byte_register());
EnsureSpace ensure_space(this);
EMIT(0x8A);
emit_operand(dst, src);
}
void Assembler::mov_b(const Operand& dst, int8_t imm8) {
EnsureSpace ensure_space(this);
EMIT(0xC6);
emit_operand(eax, dst);
EMIT(imm8);
}
void Assembler::mov_b(const Operand& dst, Register src) {
CHECK(src.is_byte_register());
EnsureSpace ensure_space(this);
EMIT(0x88);
emit_operand(src, dst);
}
void Assembler::mov_w(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x66);
EMIT(0x8B);
emit_operand(dst, src);
}
void Assembler::mov_w(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x66);
EMIT(0x89);
emit_operand(src, dst);
}
void Assembler::mov_w(const Operand& dst, int16_t imm16) {
EnsureSpace ensure_space(this);
EMIT(0x66);
EMIT(0xC7);
emit_operand(eax, dst);
EMIT(static_cast<int8_t>(imm16 & 0xff));
EMIT(static_cast<int8_t>(imm16 >> 8));
}
void Assembler::mov(Register dst, int32_t imm32) {
EnsureSpace ensure_space(this);
EMIT(0xB8 | dst.code());
emit(imm32);
}
void Assembler::mov(Register dst, const Immediate& x) {
EnsureSpace ensure_space(this);
EMIT(0xB8 | dst.code());
emit(x);
}
void Assembler::mov(Register dst, Handle<Object> handle) {
EnsureSpace ensure_space(this);
EMIT(0xB8 | dst.code());
emit(handle);
}
void Assembler::mov(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x8B);
emit_operand(dst, src);
}
void Assembler::mov(Register dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x89);
EMIT(0xC0 | src.code() << 3 | dst.code());
}
void Assembler::mov(const Operand& dst, const Immediate& x) {
EnsureSpace ensure_space(this);
EMIT(0xC7);
emit_operand(eax, dst);
emit(x);
}
void Assembler::mov(const Operand& dst, Handle<Object> handle) {
EnsureSpace ensure_space(this);
EMIT(0xC7);
emit_operand(eax, dst);
emit(handle);
}
void Assembler::mov(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x89);
emit_operand(src, dst);
}
void Assembler::movsx_b(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xBE);
emit_operand(dst, src);
}
void Assembler::movsx_w(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xBF);
emit_operand(dst, src);
}
void Assembler::movzx_b(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xB6);
emit_operand(dst, src);
}
void Assembler::movzx_w(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xB7);
emit_operand(dst, src);
}
void Assembler::cld() {
EnsureSpace ensure_space(this);
EMIT(0xFC);
}
void Assembler::rep_movs() {
EnsureSpace ensure_space(this);
EMIT(0xF3);
EMIT(0xA5);
}
void Assembler::rep_stos() {
EnsureSpace ensure_space(this);
EMIT(0xF3);
EMIT(0xAB);
}
void Assembler::stos() {
EnsureSpace ensure_space(this);
EMIT(0xAB);
}
void Assembler::xchg(Register dst, Register src) {
EnsureSpace ensure_space(this);
if (src.is(eax) || dst.is(eax)) { // Single-byte encoding.
EMIT(0x90 | (src.is(eax) ? dst.code() : src.code()));
} else {
EMIT(0x87);
EMIT(0xC0 | src.code() << 3 | dst.code());
}
}
void Assembler::xchg(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x87);
emit_operand(dst, src);
}
void Assembler::adc(Register dst, int32_t imm32) {
EnsureSpace ensure_space(this);
emit_arith(2, Operand(dst), Immediate(imm32));
}
void Assembler::adc(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x13);
emit_operand(dst, src);
}
void Assembler::add(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x03);
emit_operand(dst, src);
}
void Assembler::add(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x01);
emit_operand(src, dst);
}
void Assembler::add(const Operand& dst, const Immediate& x) {
DCHECK(reloc_info_writer.last_pc() != NULL);
EnsureSpace ensure_space(this);
emit_arith(0, dst, x);
}
void Assembler::and_(Register dst, int32_t imm32) {
and_(dst, Immediate(imm32));
}
void Assembler::and_(Register dst, const Immediate& x) {
EnsureSpace ensure_space(this);
emit_arith(4, Operand(dst), x);
}
void Assembler::and_(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x23);
emit_operand(dst, src);
}
void Assembler::and_(const Operand& dst, const Immediate& x) {
EnsureSpace ensure_space(this);
emit_arith(4, dst, x);
}
void Assembler::and_(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x21);
emit_operand(src, dst);
}
void Assembler::cmpb(const Operand& op, int8_t imm8) {
EnsureSpace ensure_space(this);
if (op.is_reg(eax)) {
EMIT(0x3C);
} else {
EMIT(0x80);
emit_operand(edi, op); // edi == 7
}
EMIT(imm8);
}
void Assembler::cmpb(const Operand& op, Register reg) {
CHECK(reg.is_byte_register());
EnsureSpace ensure_space(this);
EMIT(0x38);
emit_operand(reg, op);
}
void Assembler::cmpb(Register reg, const Operand& op) {
CHECK(reg.is_byte_register());
EnsureSpace ensure_space(this);
EMIT(0x3A);
emit_operand(reg, op);
}
void Assembler::cmpw(const Operand& op, Immediate imm16) {
DCHECK(imm16.is_int16());
EnsureSpace ensure_space(this);
EMIT(0x66);
EMIT(0x81);
emit_operand(edi, op);
emit_w(imm16);
}
void Assembler::cmp(Register reg, int32_t imm32) {
EnsureSpace ensure_space(this);
emit_arith(7, Operand(reg), Immediate(imm32));
}
void Assembler::cmp(Register reg, Handle<Object> handle) {
EnsureSpace ensure_space(this);
emit_arith(7, Operand(reg), Immediate(handle));
}
void Assembler::cmp(Register reg, const Operand& op) {
EnsureSpace ensure_space(this);
EMIT(0x3B);
emit_operand(reg, op);
}
void Assembler::cmp(const Operand& op, const Immediate& imm) {
EnsureSpace ensure_space(this);
emit_arith(7, op, imm);
}
void Assembler::cmp(const Operand& op, Handle<Object> handle) {
EnsureSpace ensure_space(this);
emit_arith(7, op, Immediate(handle));
}
void Assembler::cmpb_al(const Operand& op) {
EnsureSpace ensure_space(this);
EMIT(0x38); // CMP r/m8, r8
emit_operand(eax, op); // eax has same code as register al.
}
void Assembler::cmpw_ax(const Operand& op) {
EnsureSpace ensure_space(this);
EMIT(0x66);
EMIT(0x39); // CMP r/m16, r16
emit_operand(eax, op); // eax has same code as register ax.
}
void Assembler::dec_b(Register dst) {
CHECK(dst.is_byte_register());
EnsureSpace ensure_space(this);
EMIT(0xFE);
EMIT(0xC8 | dst.code());
}
void Assembler::dec_b(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xFE);
emit_operand(ecx, dst);
}
void Assembler::dec(Register dst) {
EnsureSpace ensure_space(this);
EMIT(0x48 | dst.code());
}
void Assembler::dec(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xFF);
emit_operand(ecx, dst);
}
void Assembler::cdq() {
EnsureSpace ensure_space(this);
EMIT(0x99);
}
void Assembler::idiv(const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
emit_operand(edi, src);
}
void Assembler::div(const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
emit_operand(esi, src);
}
void Assembler::imul(Register reg) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
EMIT(0xE8 | reg.code());
}
void Assembler::imul(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xAF);
emit_operand(dst, src);
}
void Assembler::imul(Register dst, Register src, int32_t imm32) {
imul(dst, Operand(src), imm32);
}
void Assembler::imul(Register dst, const Operand& src, int32_t imm32) {
EnsureSpace ensure_space(this);
if (is_int8(imm32)) {
EMIT(0x6B);
emit_operand(dst, src);
EMIT(imm32);
} else {
EMIT(0x69);
emit_operand(dst, src);
emit(imm32);
}
}
void Assembler::inc(Register dst) {
EnsureSpace ensure_space(this);
EMIT(0x40 | dst.code());
}
void Assembler::inc(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xFF);
emit_operand(eax, dst);
}
void Assembler::lea(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x8D);
emit_operand(dst, src);
}
void Assembler::mul(Register src) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
EMIT(0xE0 | src.code());
}
void Assembler::neg(Register dst) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
EMIT(0xD8 | dst.code());
}
void Assembler::neg(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
emit_operand(ebx, dst);
}
void Assembler::not_(Register dst) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
EMIT(0xD0 | dst.code());
}
void Assembler::not_(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xF7);
emit_operand(edx, dst);
}
void Assembler::or_(Register dst, int32_t imm32) {
EnsureSpace ensure_space(this);
emit_arith(1, Operand(dst), Immediate(imm32));
}
void Assembler::or_(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0B);
emit_operand(dst, src);
}
void Assembler::or_(const Operand& dst, const Immediate& x) {
EnsureSpace ensure_space(this);
emit_arith(1, dst, x);
}
void Assembler::or_(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x09);
emit_operand(src, dst);
}
void Assembler::rcl(Register dst, uint8_t imm8) {
EnsureSpace ensure_space(this);
DCHECK(is_uint5(imm8)); // illegal shift count
if (imm8 == 1) {
EMIT(0xD1);
EMIT(0xD0 | dst.code());
} else {
EMIT(0xC1);
EMIT(0xD0 | dst.code());
EMIT(imm8);
}
}
void Assembler::rcr(Register dst, uint8_t imm8) {
EnsureSpace ensure_space(this);
DCHECK(is_uint5(imm8)); // illegal shift count
if (imm8 == 1) {
EMIT(0xD1);
EMIT(0xD8 | dst.code());
} else {
EMIT(0xC1);
EMIT(0xD8 | dst.code());
EMIT(imm8);
}
}
void Assembler::ror(const Operand& dst, uint8_t imm8) {
EnsureSpace ensure_space(this);
DCHECK(is_uint5(imm8)); // illegal shift count
if (imm8 == 1) {
EMIT(0xD1);
emit_operand(ecx, dst);
} else {
EMIT(0xC1);
emit_operand(ecx, dst);
EMIT(imm8);
}
}
void Assembler::ror_cl(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xD3);
emit_operand(ecx, dst);
}
void Assembler::sar(const Operand& dst, uint8_t imm8) {
EnsureSpace ensure_space(this);
DCHECK(is_uint5(imm8)); // illegal shift count
if (imm8 == 1) {
EMIT(0xD1);
emit_operand(edi, dst);
} else {
EMIT(0xC1);
emit_operand(edi, dst);
EMIT(imm8);
}
}
void Assembler::sar_cl(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xD3);
emit_operand(edi, dst);
}
void Assembler::sbb(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x1B);
emit_operand(dst, src);
}
void Assembler::shld(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xA5);
emit_operand(dst, src);
}
void Assembler::shl(const Operand& dst, uint8_t imm8) {
EnsureSpace ensure_space(this);
DCHECK(is_uint5(imm8)); // illegal shift count
if (imm8 == 1) {
EMIT(0xD1);
emit_operand(esp, dst);
} else {
EMIT(0xC1);
emit_operand(esp, dst);
EMIT(imm8);
}
}
void Assembler::shl_cl(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xD3);
emit_operand(esp, dst);
}
void Assembler::shrd(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xAD);
emit_operand(dst, src);
}
void Assembler::shr(const Operand& dst, uint8_t imm8) {
EnsureSpace ensure_space(this);
DCHECK(is_uint5(imm8)); // illegal shift count
if (imm8 == 1) {
EMIT(0xD1);
emit_operand(ebp, dst);
} else {
EMIT(0xC1);
emit_operand(ebp, dst);
EMIT(imm8);
}
}
void Assembler::shr_cl(const Operand& dst) {
EnsureSpace ensure_space(this);
EMIT(0xD3);
emit_operand(ebp, dst);
}
void Assembler::sub(const Operand& dst, const Immediate& x) {
EnsureSpace ensure_space(this);
emit_arith(5, dst, x);
}
void Assembler::sub(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x2B);
emit_operand(dst, src);
}
void Assembler::sub(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x29);
emit_operand(src, dst);
}
void Assembler::test(Register reg, const Immediate& imm) {
if (RelocInfo::IsNone(imm.rmode_) && is_uint8(imm.x_)) {
test_b(reg, imm.x_);
return;
}
EnsureSpace ensure_space(this);
// This is not using emit_arith because test doesn't support
// sign-extension of 8-bit operands.
if (reg.is(eax)) {
EMIT(0xA9);
} else {
EMIT(0xF7);
EMIT(0xC0 | reg.code());
}
emit(imm);
}
void Assembler::test(Register reg, const Operand& op) {
EnsureSpace ensure_space(this);
EMIT(0x85);
emit_operand(reg, op);
}
void Assembler::test_b(Register reg, const Operand& op) {
CHECK(reg.is_byte_register());
EnsureSpace ensure_space(this);
EMIT(0x84);
emit_operand(reg, op);
}
void Assembler::test(const Operand& op, const Immediate& imm) {
if (op.is_reg_only()) {
test(op.reg(), imm);
return;
}
if (RelocInfo::IsNone(imm.rmode_) && is_uint8(imm.x_)) {
return test_b(op, imm.x_);
}
EnsureSpace ensure_space(this);
EMIT(0xF7);
emit_operand(eax, op);
emit(imm);
}
void Assembler::test_b(Register reg, uint8_t imm8) {
EnsureSpace ensure_space(this);
// Only use test against byte for registers that have a byte
// variant: eax, ebx, ecx, and edx.
if (reg.is(eax)) {
EMIT(0xA8);
EMIT(imm8);
} else if (reg.is_byte_register()) {
emit_arith_b(0xF6, 0xC0, reg, imm8);
} else {
EMIT(0xF7);
EMIT(0xC0 | reg.code());
emit(imm8);
}
}
void Assembler::test_b(const Operand& op, uint8_t imm8) {
if (op.is_reg_only()) {
test_b(op.reg(), imm8);
return;
}
EnsureSpace ensure_space(this);
EMIT(0xF6);
emit_operand(eax, op);
EMIT(imm8);
}
void Assembler::xor_(Register dst, int32_t imm32) {
EnsureSpace ensure_space(this);
emit_arith(6, Operand(dst), Immediate(imm32));
}
void Assembler::xor_(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x33);
emit_operand(dst, src);
}
void Assembler::xor_(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x31);
emit_operand(src, dst);
}
void Assembler::xor_(const Operand& dst, const Immediate& x) {
EnsureSpace ensure_space(this);
emit_arith(6, dst, x);
}
void Assembler::bt(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xA3);
emit_operand(src, dst);
}
void Assembler::bts(const Operand& dst, Register src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xAB);
emit_operand(src, dst);
}
void Assembler::bsr(Register dst, const Operand& src) {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0xBD);
emit_operand(dst, src);
}
void Assembler::hlt() {
EnsureSpace ensure_space(this);
EMIT(0xF4);
}
void Assembler::int3() {
EnsureSpace ensure_space(this);
EMIT(0xCC);
}
void Assembler::nop() {
EnsureSpace ensure_space(this);
EMIT(0x90);
}
void Assembler::ret(int imm16) {
EnsureSpace ensure_space(this);
DCHECK(is_uint16(imm16));
if (imm16 == 0) {
EMIT(0xC3);
} else {
EMIT(0xC2);
EMIT(imm16 & 0xFF);
EMIT((imm16 >> 8) & 0xFF);
}
}
void Assembler::ud2() {
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0x0B);
}
// Labels refer to positions in the (to be) generated code.
// There are bound, linked, and unused labels.
//
// Bound labels refer to known positions in the already
// generated code. pos() is the position the label refers to.
//
// Linked labels refer to unknown positions in the code
// to be generated; pos() is the position of the 32bit
// Displacement of the last instruction using the label.
void Assembler::print(Label* L) {
if (L->is_unused()) {
PrintF("unused label\n");
} else if (L->is_bound()) {
PrintF("bound label to %d\n", L->pos());
} else if (L->is_linked()) {
Label l = *L;
PrintF("unbound label");
while (l.is_linked()) {
Displacement disp = disp_at(&l);
PrintF("@ %d ", l.pos());
disp.print();
PrintF("\n");
disp.next(&l);
}
} else {
PrintF("label in inconsistent state (pos = %d)\n", L->pos_);
}
}
void Assembler::bind_to(Label* L, int pos) {
EnsureSpace ensure_space(this);
DCHECK(0 <= pos && pos <= pc_offset()); // must have a valid binding position
while (L->is_linked()) {
Displacement disp = disp_at(L);
int fixup_pos = L->pos();
if (disp.type() == Displacement::CODE_ABSOLUTE) {
long_at_put(fixup_pos, reinterpret_cast<int>(buffer_ + pos));
internal_reference_positions_.push_back(fixup_pos);
} else if (disp.type() == Displacement::CODE_RELATIVE) {
// Relative to Code* heap object pointer.
long_at_put(fixup_pos, pos + Code::kHeaderSize - kHeapObjectTag);
} else {
if (disp.type() == Displacement::UNCONDITIONAL_JUMP) {
DCHECK(byte_at(fixup_pos - 1) == 0xE9); // jmp expected
}
// Relative address, relative to point after address.
int imm32 = pos - (fixup_pos + sizeof(int32_t));
long_at_put(fixup_pos, imm32);
}
disp.next(L);
}
while (L->is_near_linked()) {
int fixup_pos = L->near_link_pos();
int offset_to_next =
static_cast<int>(*reinterpret_cast<int8_t*>(addr_at(fixup_pos)));
DCHECK(offset_to_next <= 0);
// Relative address, relative to point after address.
int disp = pos - fixup_pos - sizeof(int8_t);
CHECK(0 <= disp && disp <= 127);
set_byte_at(fixup_pos, disp);
if (offset_to_next < 0) {
L->link_to(fixup_pos + offset_to_next, Label::kNear);
} else {
L->UnuseNear();
}
}
L->bind_to(pos);
}
void Assembler::bind(Label* L) {
EnsureSpace ensure_space(this);
DCHECK(!L->is_bound()); // label can only be bound once
bind_to(L, pc_offset());
}
void Assembler::call(Label* L) {
positions_recorder()->WriteRecordedPositions();
EnsureSpace ensure_space(this);
if (L->is_bound()) {
const int long_size = 5;
int offs = L->pos() - pc_offset();
DCHECK(offs <= 0);
// 1110 1000 #32-bit disp.
EMIT(0xE8);
emit(offs - long_size);
} else {
// 1110 1000 #32-bit disp.
EMIT(0xE8);
emit_disp(L, Displacement::OTHER);
}
}
void Assembler::call(byte* entry, RelocInfo::Mode rmode) {
positions_recorder()->WriteRecordedPositions();
EnsureSpace ensure_space(this);
DCHECK(!RelocInfo::IsCodeTarget(rmode));
EMIT(0xE8);
if (RelocInfo::IsRuntimeEntry(rmode)) {
emit(reinterpret_cast<uint32_t>(entry), rmode);
} else {
emit(entry - (pc_ + sizeof(int32_t)), rmode);
}
}
int Assembler::CallSize(const Operand& adr) {
// Call size is 1 (opcode) + adr.len_ (operand).
return 1 + adr.len_;
}
void Assembler::call(const Operand& adr) {
positions_recorder()->WriteRecordedPositions();
EnsureSpace ensure_space(this);
EMIT(0xFF);
emit_operand(edx, adr);
}
int Assembler::CallSize(Handle<Code> code, RelocInfo::Mode rmode) {
return 1 /* EMIT */ + sizeof(uint32_t) /* emit */;
}
void Assembler::call(Handle<Code> code,
RelocInfo::Mode rmode,
TypeFeedbackId ast_id) {
positions_recorder()->WriteRecordedPositions();
EnsureSpace ensure_space(this);
DCHECK(RelocInfo::IsCodeTarget(rmode)
|| rmode == RelocInfo::CODE_AGE_SEQUENCE);
EMIT(0xE8);
emit(code, rmode, ast_id);
}
void Assembler::jmp(Label* L, Label::Distance distance) {
EnsureSpace ensure_space(this);
if (L->is_bound()) {
const int short_size = 2;
const int long_size = 5;
int offs = L->pos() - pc_offset();
DCHECK(offs <= 0);
if (is_int8(offs - short_size)) {
// 1110 1011 #8-bit disp.
EMIT(0xEB);
EMIT((offs - short_size) & 0xFF);
} else {
// 1110 1001 #32-bit disp.
EMIT(0xE9);
emit(offs - long_size);
}
} else if (distance == Label::kNear) {
EMIT(0xEB);
emit_near_disp(L);
} else {
// 1110 1001 #32-bit disp.
EMIT(0xE9);
emit_disp(L, Displacement::UNCONDITIONAL_JUMP);
}
}
void Assembler::jmp(byte* entry, RelocInfo::Mode rmode) {
EnsureSpace ensure_space(this);
DCHECK(!RelocInfo::IsCodeTarget(rmode));
EMIT(0xE9);
if (RelocInfo::IsRuntimeEntry(rmode)) {
emit(reinterpret_cast<uint32_t>(entry), rmode);
} else {
emit(entry - (pc_ + sizeof(int32_t)), rmode);
}
}
void Assembler::jmp(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xFF);
emit_operand(esp, adr);
}
void Assembler::jmp(Handle<Code> code, RelocInfo::Mode rmode) {
EnsureSpace ensure_space(this);
DCHECK(RelocInfo::IsCodeTarget(rmode));
EMIT(0xE9);
emit(code, rmode);
}
void Assembler::j(Condition cc, Label* L, Label::Distance distance) {
EnsureSpace ensure_space(this);
DCHECK(0 <= cc && static_cast<int>(cc) < 16);
if (L->is_bound()) {
const int short_size = 2;
const int long_size = 6;
int offs = L->pos() - pc_offset();
DCHECK(offs <= 0);
if (is_int8(offs - short_size)) {
// 0111 tttn #8-bit disp
EMIT(0x70 | cc);
EMIT((offs - short_size) & 0xFF);
} else {
// 0000 1111 1000 tttn #32-bit disp
EMIT(0x0F);
EMIT(0x80 | cc);
emit(offs - long_size);
}
} else if (distance == Label::kNear) {
EMIT(0x70 | cc);
emit_near_disp(L);
} else {
// 0000 1111 1000 tttn #32-bit disp
// Note: could eliminate cond. jumps to this jump if condition
// is the same however, seems to be rather unlikely case.
EMIT(0x0F);
EMIT(0x80 | cc);
emit_disp(L, Displacement::OTHER);
}
}
void Assembler::j(Condition cc, byte* entry, RelocInfo::Mode rmode) {
EnsureSpace ensure_space(this);
DCHECK((0 <= cc) && (static_cast<int>(cc) < 16));
// 0000 1111 1000 tttn #32-bit disp.
EMIT(0x0F);
EMIT(0x80 | cc);
if (RelocInfo::IsRuntimeEntry(rmode)) {
emit(reinterpret_cast<uint32_t>(entry), rmode);
} else {
emit(entry - (pc_ + sizeof(int32_t)), rmode);
}
}
void Assembler::j(Condition cc, Handle<Code> code) {
EnsureSpace ensure_space(this);
// 0000 1111 1000 tttn #32-bit disp
EMIT(0x0F);
EMIT(0x80 | cc);
emit(code, RelocInfo::CODE_TARGET);
}
// FPU instructions.
void Assembler::fld(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xD9, 0xC0, i);
}
void Assembler::fstp(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDD, 0xD8, i);
}
void Assembler::fld1() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xE8);
}
void Assembler::fldpi() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xEB);
}
void Assembler::fldz() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xEE);
}
void Assembler::fldln2() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xED);
}
void Assembler::fld_s(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xD9);
emit_operand(eax, adr);
}
void Assembler::fld_d(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDD);
emit_operand(eax, adr);
}
void Assembler::fstp_s(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xD9);
emit_operand(ebx, adr);
}
void Assembler::fst_s(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xD9);
emit_operand(edx, adr);
}
void Assembler::fldcw(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xD9);
emit_operand(ebp, adr);
}
void Assembler::fnstcw(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xD9);
emit_operand(edi, adr);
}
void Assembler::fstp_d(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDD);
emit_operand(ebx, adr);
}
void Assembler::fst_d(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDD);
emit_operand(edx, adr);
}
void Assembler::fild_s(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDB);
emit_operand(eax, adr);
}
void Assembler::fild_d(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDF);
emit_operand(ebp, adr);
}
void Assembler::fistp_s(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDB);
emit_operand(ebx, adr);
}
void Assembler::fisttp_s(const Operand& adr) {
DCHECK(IsEnabled(SSE3));
EnsureSpace ensure_space(this);
EMIT(0xDB);
emit_operand(ecx, adr);
}
void Assembler::fisttp_d(const Operand& adr) {
DCHECK(IsEnabled(SSE3));
EnsureSpace ensure_space(this);
EMIT(0xDD);
emit_operand(ecx, adr);
}
void Assembler::fist_s(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDB);
emit_operand(edx, adr);
}
void Assembler::fistp_d(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDF);
emit_operand(edi, adr);
}
void Assembler::fabs() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xE1);
}
void Assembler::fchs() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xE0);
}
void Assembler::fsqrt() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xFA);
}
void Assembler::fcos() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xFF);
}
void Assembler::fsin() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xFE);
}
void Assembler::fptan() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xF2);
}
void Assembler::fyl2x() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xF1);
}
void Assembler::f2xm1() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xF0);
}
void Assembler::fscale() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xFD);
}
void Assembler::fninit() {
EnsureSpace ensure_space(this);
EMIT(0xDB);
EMIT(0xE3);
}
void Assembler::fadd(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDC, 0xC0, i);
}
void Assembler::fadd_i(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xD8, 0xC0, i);
}
void Assembler::fadd_d(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDC);
emit_operand(eax, adr);
}
void Assembler::fsub(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDC, 0xE8, i);
}
void Assembler::fsub_i(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xD8, 0xE0, i);
}
void Assembler::fisub_s(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDA);
emit_operand(esp, adr);
}
void Assembler::fmul_i(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xD8, 0xC8, i);
}
void Assembler::fmul(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDC, 0xC8, i);
}
void Assembler::fdiv(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDC, 0xF8, i);
}
void Assembler::fdiv_i(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xD8, 0xF0, i);
}
void Assembler::faddp(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDE, 0xC0, i);
}
void Assembler::fsubp(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDE, 0xE8, i);
}
void Assembler::fsubrp(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDE, 0xE0, i);
}
void Assembler::fmulp(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDE, 0xC8, i);
}
void Assembler::fdivp(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDE, 0xF8, i);
}
void Assembler::fprem() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xF8);
}
void Assembler::fprem1() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xF5);
}
void Assembler::fxch(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xD9, 0xC8, i);
}
void Assembler::fincstp() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xF7);
}
void Assembler::ffree(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDD, 0xC0, i);
}
void Assembler::ftst() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xE4);
}
void Assembler::fxam() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xE5);
}
void Assembler::fucomp(int i) {
EnsureSpace ensure_space(this);
emit_farith(0xDD, 0xE8, i);
}
void Assembler::fucompp() {
EnsureSpace ensure_space(this);
EMIT(0xDA);
EMIT(0xE9);
}
void Assembler::fucomi(int i) {
EnsureSpace ensure_space(this);
EMIT(0xDB);
EMIT(0xE8 + i);
}
void Assembler::fucomip() {
EnsureSpace ensure_space(this);
EMIT(0xDF);
EMIT(0xE9);
}
void Assembler::fcompp() {
EnsureSpace ensure_space(this);
EMIT(0xDE);
EMIT(0xD9);
}
void Assembler::fnstsw_ax() {
EnsureSpace ensure_space(this);
EMIT(0xDF);
EMIT(0xE0);
}
void Assembler::fwait() {
EnsureSpace ensure_space(this);
EMIT(0x9B);
}
void Assembler::frndint() {
EnsureSpace ensure_space(this);
EMIT(0xD9);
EMIT(0xFC);
}
void Assembler::fnclex() {
EnsureSpace ensure_space(this);
EMIT(0xDB);
EMIT(0xE2);
}
void Assembler::fnsave(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDD);
emit_operand(esi, adr);
}
void Assembler::frstor(const Operand& adr) {
EnsureSpace ensure_space(this);
EMIT(0xDD);
emit_operand(esp, adr);
}
void Assembler::sahf() {
EnsureSpace ensure_space(this);
EMIT(0x9E);
}
void Assembler::setcc(Condition cc, Register reg) {
DCHECK(reg.is_byte_register());
EnsureSpace ensure_space(this);
EMIT(0x0F);
EMIT(0x90 | cc);
EMIT(0xC0 | reg.code());
}
void Assembler::GrowBuffer() {
DCHECK(buffer_overflow());
if (!own_buffer_) FATAL("external code buffer is too small");
// Compute new buffer size.
CodeDesc desc; // the new buffer
desc.buffer_size = 2 * buffer_size_;
// Some internal data structures overflow for very large buffers,
// they must ensure that kMaximalBufferSize is not too large.
if ((desc.buffer_size > kMaximalBufferSize) ||
(desc.buffer_size > isolate()->heap()->MaxOldGenerationSize())) {
V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
}
// Set up new buffer.
desc.buffer = NewArray<byte>(desc.buffer_size);
desc.instr_size = pc_offset();
desc.reloc_size = (buffer_ + buffer_size_) - (reloc_info_writer.pos());
// Clear the buffer in debug mode. Use 'int3' instructions to make
// sure to get into problems if we ever run uninitialized code.
#ifdef DEBUG
memset(desc.buffer, 0xCC, desc.buffer_size);
#endif
// Copy the data.
int pc_delta = desc.buffer - buffer_;
int rc_delta = (desc.buffer + desc.buffer_size) - (buffer_ + buffer_size_);
MemMove(desc.buffer, buffer_, desc.instr_size);
MemMove(rc_delta + reloc_info_writer.pos(), reloc_info_writer.pos(),
desc.reloc_size);
DeleteArray(buffer_);
buffer_ = desc.buffer;
buffer_size_ = desc.buffer_size;
pc_ += pc_delta;
reloc_info_writer.Reposition(reloc_info_writer.pos() + rc_delta,
reloc_info_writer.last_pc() + pc_delta);
// Relocate internal references.
for (auto pos : internal_reference_positions_) {
int32_t* p = reinterpret_cast<int32_t*>(buffer_ + pos);
*p += pc_delta;
}
DCHECK(!buffer_overflow());
}
void Assembler::emit_arith_b(int op1, int op2, Register dst, int imm8) {
DCHECK(is_uint8(op1) && is_uint8(op2)); // wrong opcode
DCHECK(is_uint8(imm8));
DCHECK((op1 & 0x01) == 0); // should be 8bit operation
EMIT(op1);
EMIT(op2 | dst.code());
EMIT(imm8);
}
void Assembler::emit_arith(int sel, Operand dst, const Immediate& x) {
DCHECK((0 <= sel) && (sel <= 7));
Register ireg = { sel };
if (x.is_int8()) {
EMIT(0x83); // using a sign-extended 8-bit immediate.
emit_operand(ireg, dst);
EMIT(x.x_ & 0xFF);
} else if (dst.is_reg(eax)) {
EMIT((sel << 3) | 0x05); // short form if the destination is eax.
emit(x);
} else {
EMIT(0x81); // using a literal 32-bit immediate.
emit_operand(ireg, dst);
emit(x);
}
}
void Assembler::emit_operand(Register reg, const Operand& adr) {
const unsigned length = adr.len_;
DCHECK(length > 0);
// Emit updated ModRM byte containing the given register.
pc_[0] = (adr.buf_[0] & ~0x38) | (reg.code() << 3);
// Emit the rest of the encoded operand.
for (unsigned i = 1; i < length; i++) pc_[i] = adr.buf_[i];
pc_ += length;
// Emit relocation information if necessary.
if (length >= sizeof(int32_t) && !RelocInfo::IsNone(adr.rmode_)) {
pc_ -= sizeof(int32_t); // pc_ must be *at* disp32
RecordRelocInfo(adr.rmode_);
if (adr.rmode_ == RelocInfo::INTERNAL_REFERENCE) { // Fixup for labels
emit_label(*reinterpret_cast<Label**>(pc_));
} else {
pc_ += sizeof(int32_t);
}
}
}
void Assembler::emit_label(Label* label) {
if (label->is_bound()) {
internal_reference_positions_.push_back(pc_offset());
emit(reinterpret_cast<uint32_t>(buffer_ + label->pos()));
} else {
emit_disp(label, Displacement::CODE_ABSOLUTE);
}
}
void Assembler::emit_farith(int b1, int b2, int i) {
DCHECK(is_uint8(b1) && is_uint8(b2)); // wrong opcode
DCHECK(0 <= i && i < 8); // illegal stack offset
EMIT(b1);
EMIT(b2 + i);
}
void Assembler::db(uint8_t data) {
EnsureSpace ensure_space(this);
EMIT(data);
}
void Assembler::dd(uint32_t data) {
EnsureSpace ensure_space(this);
emit(data);
}
void Assembler::dd(Label* label) {
EnsureSpace ensure_space(this);
RecordRelocInfo(RelocInfo::INTERNAL_REFERENCE);
emit_label(label);
}
void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
DCHECK(!RelocInfo::IsNone(rmode));
// Don't record external references unless the heap will be serialized.
if (rmode == RelocInfo::EXTERNAL_REFERENCE &&
!serializer_enabled() && !emit_debug_code()) {
return;
}
RelocInfo rinfo(pc_, rmode, data, NULL);
reloc_info_writer.Write(&rinfo);
}
Handle<ConstantPoolArray> Assembler::NewConstantPool(Isolate* isolate) {
// No out-of-line constant pool support.
DCHECK(!FLAG_enable_ool_constant_pool);
return isolate->factory()->empty_constant_pool_array();
}
void Assembler::PopulateConstantPool(ConstantPoolArray* constant_pool) {
// No out-of-line constant pool support.
DCHECK(!FLAG_enable_ool_constant_pool);
return;
}
#ifdef GENERATED_CODE_COVERAGE
static FILE* coverage_log = NULL;
static void InitCoverageLog() {
char* file_name = getenv("V8_GENERATED_CODE_COVERAGE_LOG");
if (file_name != NULL) {
coverage_log = fopen(file_name, "aw+");
}
}
void LogGeneratedCodeCoverage(const char* file_line) {
const char* return_address = (&file_line)[-1];
char* push_insn = const_cast<char*>(return_address - 12);
push_insn[0] = 0xeb; // Relative branch insn.
push_insn[1] = 13; // Skip over coverage insns.
if (coverage_log != NULL) {
fprintf(coverage_log, "%s\n", file_line);
fflush(coverage_log);
}
}
#endif
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_X87