v8/src/x64/assembler-x64-inl.h

// Copyright 2009 the V8 project authors. All rights reserved.
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// 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.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//       from this software without specific prior written permission.
//
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#ifndef V8_X64_ASSEMBLER_X64_INL_H_
#define V8_X64_ASSEMBLER_X64_INL_H_

#include "cpu.h"

namespace v8 { namespace internal {

Condition NegateCondition(Condition cc) {
  return static_cast<Condition>(cc ^ 1);
}


// The modes possibly affected by apply must be in kApplyMask.
void RelocInfo::apply(int delta) {
  if (rmode_ == RUNTIME_ENTRY || IsCodeTarget(rmode_)) {
    intptr_t* p = reinterpret_cast<intptr_t*>(pc_);
    *p -= delta;  // relocate entry
  } else if (rmode_ == JS_RETURN && IsCallInstruction()) {
    // Special handling of js_return when a break point is set (call
    // instruction has been inserted).
    intptr_t* p = reinterpret_cast<intptr_t*>(pc_ + 1);
    *p -= delta;  // relocate entry
  } else if (IsInternalReference(rmode_)) {
    // absolute code pointer inside code object moves with the code object.
    intptr_t* p = reinterpret_cast<intptr_t*>(pc_);
    *p += delta;  // relocate entry
  }
}


Address RelocInfo::target_address() {
  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
  return Assembler::target_address_at(pc_);
}


Address RelocInfo::target_address_address() {
  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
  return reinterpret_cast<Address>(pc_);
}


void RelocInfo::set_target_address(Address target) {
  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
  Assembler::set_target_address_at(pc_, target);
}


void Assembler::set_target_address_at(byte* location, byte* value) {
  UNIMPLEMENTED();
}


byte* Assembler::target_address_at(byte* location) {
  UNIMPLEMENTED();
  return NULL;
}


Object* RelocInfo::target_object() {
  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
  return *reinterpret_cast<Object**>(pc_);
}


Object** RelocInfo::target_object_address() {
  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
  return reinterpret_cast<Object**>(pc_);
}


Address* RelocInfo::target_reference_address() {
  ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
  return reinterpret_cast<Address*>(pc_);
}


void RelocInfo::set_target_object(Object* target) {
  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
  *reinterpret_cast<Object**>(pc_) = target;
}


bool RelocInfo::IsCallInstruction() {
  UNIMPLEMENTED();  // IA32 code below.
  return *pc_ == 0xE8;
}


Address RelocInfo::call_address() {
  UNIMPLEMENTED();  // IA32 code below.
  ASSERT(IsCallInstruction());
  return Assembler::target_address_at(pc_ + 1);
}


void RelocInfo::set_call_address(Address target) {
  UNIMPLEMENTED();  // IA32 code below.
  ASSERT(IsCallInstruction());
  Assembler::set_target_address_at(pc_ + 1, target);
}


Object* RelocInfo::call_object() {
  UNIMPLEMENTED();  // IA32 code below.
  ASSERT(IsCallInstruction());
  return *call_object_address();
}


void RelocInfo::set_call_object(Object* target) {
  UNIMPLEMENTED();  // IA32 code below.
  ASSERT(IsCallInstruction());
  *call_object_address() = target;
}


Object** RelocInfo::call_object_address() {
  UNIMPLEMENTED();  // IA32 code below.
  ASSERT(IsCallInstruction());
  return reinterpret_cast<Object**>(pc_ + 1);
}


void Operand::set_modrm(int mod, Register rm) {
  ASSERT((mod & -4) == 0);
  buf_[0] = mod << 6 | (rm.code() & 0x7);
  // Set REX.B to the high bit of rm.code().
  rex_ |= (rm.code() >> 3);
  len_ = 1;
}


void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
  ASSERT(len_ == 1);
  ASSERT((scale & -4) == 0);
  // Use SIB with no index register only for base rsp or r12.
  ASSERT(!index.is(rsp) || base.is(rsp) || base.is(r12));
  buf_[1] = scale << 6 | (index.code() & 0x7) << 3 | (base.code() & 0x7);
  rex_ |= (index.code() >> 3) << 1 | base.code() >> 3;
  len_ = 2;
}


void Operand::set_disp32(int32_t disp) {
  ASSERT(len_ == 1 || len_ == 2);
  int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
  *p = disp;
  len_ += sizeof(int32_t);
}


void Operand::set_dispr(intptr_t disp, RelocInfo::Mode rmode) {
  // This cannot be used in 64-bit mode.  A 64-bit displacement
  // cannot be encoded, so relocatable 64-bit values must be
  // loaded as immediates.
  UNIMPLEMENTED();
}


Operand::Operand(Register reg) {
  // reg
  set_modrm(3, reg);
}

} }  // namespace v8::internal

#endif  // V8_X64_ASSEMBLER_X64_INL_H_