CSE2410 Fall 2014 Bounce

// 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 2006-2008 the V8 project authors. All rights reserved.

// A light-weight IA32 Assembler.

#ifndef V8_ASSEMBLER_IA32_INL_H_

#define V8_ASSEMBLER_IA32_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_)) {

    int32_t* p = reinterpret_cast<int32_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).

    int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);

    *p -= delta;  // relocate entry

  } else if (IsInternalReference(rmode_)) {

    // absolute code pointer inside code object moves with the code object.

    int32_t* p = reinterpret_cast<int32_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);

}

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_);

}

void RelocInfo::set_target_object(Object* target) {

  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);

  *reinterpret_cast<Object**>(pc_) = target;

}

Address* RelocInfo::target_reference_address() {

  ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE);

  return reinterpret_cast<Address*>(pc_);

}

Address RelocInfo::call_address() {

  ASSERT(IsCallInstruction());

  return Assembler::target_address_at(pc_ + 1);

}

void RelocInfo::set_call_address(Address target) {

  ASSERT(IsCallInstruction());

  Assembler::set_target_address_at(pc_ + 1, target);

}

Object* RelocInfo::call_object() {

  ASSERT(IsCallInstruction());

  return *call_object_address();

}

Object** RelocInfo::call_object_address() {

  ASSERT(IsCallInstruction());

  return reinterpret_cast<Object**>(pc_ + 1);

}

void RelocInfo::set_call_object(Object* target) {

  ASSERT(IsCallInstruction());

  *call_object_address() = target;

}

bool RelocInfo::IsCallInstruction() {

  return *pc_ == 0xE8;

}

Immediate::Immediate(int x)  {

  x_ = x;

  rmode_ = RelocInfo::NONE;

}

Immediate::Immediate(const ExternalReference& ext) {

  x_ = reinterpret_cast<int32_t>(ext.address());

  rmode_ = RelocInfo::EXTERNAL_REFERENCE;

}

Immediate::Immediate(const char* s) {

  x_ = reinterpret_cast<int32_t>(s);

  rmode_ = RelocInfo::EMBEDDED_STRING;

}

Immediate::Immediate(Label *internal_offset) {

  x_ = reinterpret_cast<int32_t>(internal_offset);

  rmode_ = RelocInfo::INTERNAL_REFERENCE;

}

Immediate::Immediate(Handle<Object> handle) {

  // Verify all Objects referred by code are NOT in new space.

  Object* obj = *handle;

  ASSERT(!Heap::InNewSpace(obj));

  if (obj->IsHeapObject()) {

    x_ = reinterpret_cast<intptr_t>(handle.location());

    rmode_ = RelocInfo::EMBEDDED_OBJECT;

  } else {

    // no relocation needed

    x_ =  reinterpret_cast<intptr_t>(obj);

    rmode_ = RelocInfo::NONE;

  }

}

Immediate::Immediate(Smi* value) {

  x_ = reinterpret_cast<intptr_t>(value);

  rmode_ = RelocInfo::NONE;

}

void Assembler::emit(uint32_t x) {

  *reinterpret_cast<uint32_t*>(pc_) = x;

  pc_ += sizeof(uint32_t);

}

void Assembler::emit(Handle<Object> handle) {

  // Verify all Objects referred by code are NOT in new space.

  Object* obj = *handle;

  ASSERT(!Heap::InNewSpace(obj));

  if (obj->IsHeapObject()) {

    emit(reinterpret_cast<intptr_t>(handle.location()),

         RelocInfo::EMBEDDED_OBJECT);

  } else {

    // no relocation needed

    emit(reinterpret_cast<intptr_t>(obj));

  }

}

void Assembler::emit(uint32_t x, RelocInfo::Mode rmode) {

  if (rmode != RelocInfo::NONE) RecordRelocInfo(rmode);

  emit(x);

}

void Assembler::emit(const Immediate& x) {

  if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {

    Label* label = reinterpret_cast<Label*>(x.x_);

    emit_code_relative_offset(label);

    return;

  }

  if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_);

  emit(x.x_);

}

void Assembler::emit_code_relative_offset(Label* label) {

  if (label->is_bound()) {

    int32_t pos;

    pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;

    emit(pos);

  } else {

    emit_disp(label, Displacement::CODE_RELATIVE);

  }

}

void Assembler::emit_w(const Immediate& x) {

  ASSERT(x.rmode_ == RelocInfo::NONE);

  uint16_t value = static_cast<uint16_t>(x.x_);

  reinterpret_cast<uint16_t*>(pc_)[0] = value;

  pc_ += sizeof(uint16_t);

}

Address Assembler::target_address_at(Address pc) {

  return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc);

}

void Assembler::set_target_address_at(Address pc, Address target) {

  int32_t* p = reinterpret_cast<int32_t*>(pc);

  *p = target - (pc + sizeof(int32_t));

  CPU::FlushICache(p, sizeof(int32_t));

}

Displacement Assembler::disp_at(Label* L) {

  return Displacement(long_at(L->pos()));

}

void Assembler::disp_at_put(Label* L, Displacement disp) {

  long_at_put(L->pos(), disp.data());

}

void Assembler::emit_disp(Label* L, Displacement::Type type) {

  Displacement disp(L, type);

  L->link_to(pc_offset());

  emit(static_cast<int>(disp.data()));

}

void Operand::set_modrm(int mod, Register rm) {

  ASSERT((mod & -4) == 0);

  buf_[0] = mod << 6 | rm.code();

  len_ = 1;

}

void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {

  ASSERT(len_ == 1 || len_ == 2);

  int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);

  *p = disp;

  len_ += sizeof(int32_t);

  rmode_ = rmode;

}

Operand::Operand(Register reg) {

  // reg

  set_modrm(3, reg);

}

Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {

  // [disp/r]

  set_modrm(0, ebp);

  set_dispr(disp, rmode);

}

} }  // namespace v8::internal

#endif  // V8_ASSEMBLER_IA32_INL_H_