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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/basictypes.h"
// COURGETTE_HISTOGRAM_TARGETS prints out a histogram of how frequently
// different target addresses are referenced. Purely for debugging.
namespace courgette {
typedef uint32 RVA;
// A Label is a symbolic reference to an address. Unlike a conventional
// assembly language, we always know the address. The address will later be
// stored in a table and the Label will be replaced with the index into the
// table.
// TODO(huangs): Make this a struct, and remove "_" from member names.
class Label {
enum : int { kNoIndex = -1 };
explicit Label(RVA rva) : rva_(rva) {}
bool operator==(const Label& other) const {
return rva_ == other.rva_ && index_ == other.index_ &&
count_ == other.count_;
RVA rva_ = 0; // Address referred to by the label.
int index_ = kNoIndex; // Index of address in address table.
int32 count_ = 0;
// These helper functions avoid the need for casts in the main code.
inline uint16 ReadU16(const uint8* address, size_t offset) {
return *reinterpret_cast<const uint16*>(address + offset);
inline uint32 ReadU32(const uint8* address, size_t offset) {
return *reinterpret_cast<const uint32*>(address + offset);
inline uint64 ReadU64(const uint8* address, size_t offset) {
return *reinterpret_cast<const uint64*>(address + offset);
inline uint16 Read16LittleEndian(const void* address) {
return *reinterpret_cast<const uint16*>(address);
inline uint32 Read32LittleEndian(const void* address) {
return *reinterpret_cast<const uint32*>(address);
inline uint64 Read64LittleEndian(const void* address) {
return *reinterpret_cast<const uint64*>(address);
} // namespace courgette