assembler-ia32.cc.svn-base

Google浏览器V8内核代码

  EMIT(0xDF);
  emit_operand(edi, adr);
}


void Assembler::fabs() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xD9);
  EMIT(0xE1);
}


void Assembler::fchs() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xD9);
  EMIT(0xE0);
}


void Assembler::fadd(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDC, 0xC0, i);
}


void Assembler::fsub(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDC, 0xE8, i);
}


void Assembler::fisub_s(const Operand& adr) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xDA);
  emit_operand(esp, adr);
}


void Assembler::fmul(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDC, 0xC8, i);
}


void Assembler::fdiv(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDC, 0xF8, i);
}


void Assembler::faddp(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDE, 0xC0, i);
}


void Assembler::fsubp(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDE, 0xE8, i);
}


void Assembler::fsubrp(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDE, 0xE0, i);
}


void Assembler::fmulp(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDE, 0xC8, i);
}


void Assembler::fdivp(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDE, 0xF8, i);
}


void Assembler::fprem() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xD9);
  EMIT(0xF8);
}


void Assembler::fprem1() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xD9);
  EMIT(0xF5);
}


void Assembler::fxch(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xD9, 0xC8, i);
}


void Assembler::fincstp() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xD9);
  EMIT(0xF7);
}


void Assembler::ffree(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDD, 0xC0, i);
}


void Assembler::ftst() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xD9);
  EMIT(0xE4);
}


void Assembler::fucomp(int i) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  emit_farith(0xDD, 0xE8, i);
}


void Assembler::fucompp() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xDA);
  EMIT(0xE9);
}


void Assembler::fcompp() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xDE);
  EMIT(0xD9);
}


void Assembler::fnstsw_ax() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xdF);
  EMIT(0xE0);
}


void Assembler::fwait() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0x9B);
}


void Assembler::frndint() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xD9);
  EMIT(0xFC);
}


void Assembler::sahf() {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0x9E);
}


void Assembler::cvttss2si(Register dst, const Operand& src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF3);
  EMIT(0x0F);
  EMIT(0x2C);
  emit_operand(dst, src);
}


void Assembler::cvttsd2si(Register dst, const Operand& src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);
  EMIT(0x0F);
  EMIT(0x2C);
  emit_operand(dst, src);
}


void Assembler::cvtsi2sd(XMMRegister dst, const Operand& src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);
  EMIT(0x0F);
  EMIT(0x2A);
  emit_sse_operand(dst, src);
}


void Assembler::addsd(XMMRegister dst, XMMRegister src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);
  EMIT(0x0F);
  EMIT(0x58);
  emit_sse_operand(dst, src);
}


void Assembler::mulsd(XMMRegister dst, XMMRegister src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);
  EMIT(0x0F);
  EMIT(0x59);
  emit_sse_operand(dst, src);
}


void Assembler::subsd(XMMRegister dst, XMMRegister src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);
  EMIT(0x0F);
  EMIT(0x5C);
  emit_sse_operand(dst, src);
}


void Assembler::divsd(XMMRegister dst, XMMRegister src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);
  EMIT(0x0F);
  EMIT(0x5E);
  emit_sse_operand(dst, src);
}


void Assembler::movdbl(XMMRegister dst, const Operand& src) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  movsd(dst, src);
}


void Assembler::movdbl(const Operand& dst, XMMRegister src) {
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  movsd(dst, src);
}


void Assembler::movsd(const Operand& dst, XMMRegister src ) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);  // double
  EMIT(0x0F);
  EMIT(0x11);  // store
  emit_sse_operand(src, dst);
}


void Assembler::movsd(XMMRegister dst, const Operand& src) {
  ASSERT(CpuFeatures::IsEnabled(CpuFeatures::SSE2));
  EnsureSpace ensure_space(this);
  last_pc_ = pc_;
  EMIT(0xF2);  // double
  EMIT(0x0F);
  EMIT(0x10);  // load
  emit_sse_operand(dst, src);
}


void Assembler::emit_sse_operand(XMMRegister reg, const Operand& adr) {
  Register ireg = { reg.code() };
  emit_operand(ireg, adr);
}


void Assembler::emit_sse_operand(XMMRegister dst, XMMRegister src) {
  EMIT(0xC0 | dst.code() << 3 | src.code());
}


void Assembler::Print() {
  Disassembler::Decode(stdout, buffer_, pc_);
}


void Assembler::RecordJSReturn() {
  WriteRecordedPositions();
  EnsureSpace ensure_space(this);
  RecordRelocInfo(RelocInfo::JS_RETURN);
}


void Assembler::RecordComment(const char* msg) {
  if (FLAG_debug_code) {
    EnsureSpace ensure_space(this);
    RecordRelocInfo(RelocInfo::COMMENT, reinterpret_cast<intptr_t>(msg));
  }
}


void Assembler::RecordPosition(int pos) {
  if (pos == RelocInfo::kNoPosition) return;
  ASSERT(pos >= 0);
  last_position_ = pos;
}


void Assembler::RecordStatementPosition(int pos) {
  if (pos == RelocInfo::kNoPosition) return;
  ASSERT(pos >= 0);
  last_statement_position_ = pos;
}


void Assembler::WriteRecordedPositions() {
  if (last_statement_position_ != RelocInfo::kNoPosition) {
    EnsureSpace ensure_space(this);
    RecordRelocInfo(RelocInfo::STATEMENT_POSITION, last_statement_position_);
  }
  if ((last_position_ != RelocInfo::kNoPosition) &&
      (last_position_ != last_statement_position_)) {
    EnsureSpace ensure_space(this);
    RecordRelocInfo(RelocInfo::POSITION, last_position_);
  }
  last_statement_position_ = RelocInfo::kNoPosition;
  last_position_ = RelocInfo::kNoPosition;
}


void Assembler::GrowBuffer() {
  ASSERT(overflow());  // should not call this otherwise
  if (!own_buffer_) FATAL("external code buffer is too small");

  // compute new buffer size
  CodeDesc desc;  // the new buffer
  if (buffer_size_ < 4*KB) {
    desc.buffer_size = 4*KB;
  } else {
    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 > Heap::OldGenerationSize())) {
    V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
  }

  // setup 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.
  if (kDebug) {
    memset(desc.buffer, 0xCC, desc.buffer_size);
  }

  // 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);

  // switch buffers
  if (spare_buffer_ == NULL && buffer_size_ == kMinimalBufferSize) {
    spare_buffer_ = buffer_;
  } else {
    DeleteArray(buffer_);
  }
  buffer_ = desc.buffer;
  buffer_size_ = desc.buffer_size;
  pc_ += pc_delta;
  if (last_pc_ != NULL) {
    last_pc_ += pc_delta;
  }
  reloc_info_writer.Reposition(reloc_info_writer.pos() + rc_delta,
                               reloc_info_writer.last_pc() + pc_delta);

  // relocate runtime entries
  for (RelocIterator it(desc); !it.done(); it.next()) {
    RelocInfo::Mode rmode = it.rinfo()->rmode();
    if (rmode == RelocInfo::RUNTIME_ENTRY) {
      int32_t* p = reinterpret_cast<int32_t*>(it.rinfo()->pc());
      *p -= pc_delta;  // relocate entry
    } else if (rmode == RelocInfo::INTERNAL_REFERENCE) {
      int32_t* p = reinterpret_cast<int32_t*>(it.rinfo()->pc());
      if (*p != 0) {  // 0 means uninitialized.
        *p += pc_delta;
      }
    }
  }

  ASSERT(!overflow());
}


void Assembler::emit_arith_b(int op1, int op2, Register dst, int imm8) {
  ASSERT(is_uint8(op1) && is_uint8(op2));  // wrong opcode
  ASSERT(is_uint8(imm8));
  ASSERT((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) {
  ASSERT((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) {
  adr.set_reg(reg);
  memmove(pc_, adr.buf_, adr.len_);
  pc_ += adr.len_;
  if (adr.len_ >= sizeof(int32_t) && adr.rmode_ != RelocInfo::NONE) {
    pc_ -= sizeof(int32_t);  // pc_ must be *at* disp32
    RecordRelocInfo(adr.rmode_);
    pc_ += sizeof(int32_t);
  }
}


void Assembler::emit_operand(const Operand& adr, Register reg) {
  adr.set_reg(reg);
  memmove(pc_, adr.buf_, adr.len_);
  pc_ += adr.len_;
  if (adr.len_ >= sizeof(int32_t) && adr.rmode_ != RelocInfo::NONE) {
    pc_ -= sizeof(int32_t);  // pc_ must be *at* disp32
    RecordRelocInfo(adr.rmode_);
    pc_ += sizeof(int32_t);
  }
}


void Assembler::emit_farith(int b1, int b2, int i) {
  ASSERT(is_uint8(b1) && is_uint8(b2));  // wrong opcode
  ASSERT(0 <= i &&  i < 8);  // illegal stack offset
  EMIT(b1);
  EMIT(b2 + i);
}


void Assembler::dd(uint32_t data, RelocInfo::Mode reloc_info) {
  EnsureSpace ensure_space(this);
  emit(data, reloc_info);
}


void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
  ASSERT(rmode != RelocInfo::NONE);
  // Don't record external references unless the heap will be serialized.
  if (rmode == RelocInfo::EXTERNAL_REFERENCE &&
      !Serializer::enabled() &&
      !FLAG_debug_code) {
    return;
  }
  RelocInfo rinfo(pc_, rmode, data);
  reloc_info_writer.Write(&rinfo);
}

void Assembler::WriteInternalReference(int position, const Label& bound_label) {
  ASSERT(bound_label.is_bound());
  ASSERT(0 <= position);
  ASSERT(position + static_cast<int>(sizeof(uint32_t)) <= pc_offset());
  ASSERT(long_at(position) == 0);  // only initialize once!

  uint32_t label_loc = reinterpret_cast<uint32_t>(addr_at(bound_label.pos()));
  long_at_put(position, label_loc);
}

} }  // namespace v8::internal