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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COURGETTE_INSTRUCTION_UTILS_H_
#define COURGETTE_INSTRUCTION_UTILS_H_
#include <stdint.h>
#include "base/functional/callback.h"
#include "courgette/image_utils.h"
#include "courgette/memory_allocator.h"
namespace courgette {
// An interface to receive emitted instructions parsed from an executable.
class InstructionReceptor {
public:
InstructionReceptor() = default;
InstructionReceptor(const InstructionReceptor&) = delete;
InstructionReceptor& operator=(const InstructionReceptor&) = delete;
virtual ~InstructionReceptor() = default;
// Generates an entire base relocation table.
virtual CheckBool EmitPeRelocs() = 0;
// Generates an ELF style relocation table for X86.
virtual CheckBool EmitElfRelocation() = 0;
// Following instruction will be assembled at address 'rva'.
virtual CheckBool EmitOrigin(RVA rva) = 0;
// Generates a single byte of data or machine instruction.
virtual CheckBool EmitSingleByte(uint8_t byte) = 0;
// Generates multiple bytes of data or machine instructions.
virtual CheckBool EmitMultipleBytes(const uint8_t* bytes, size_t len) = 0;
// Generates a 4-byte relative reference to address of 'label'.
virtual CheckBool EmitRel32(Label* label) = 0;
// Generates a 4-byte absolute reference to address of 'label'.
virtual CheckBool EmitAbs32(Label* label) = 0;
// Generates an 8-byte absolute reference to address of 'label'.
virtual CheckBool EmitAbs64(Label* label) = 0;
};
// A rerunable callback that emit instructions to a provided receptor. Returns
// true on success, and false otherwise.
using InstructionGenerator =
base::RepeatingCallback<CheckBool(InstructionReceptor*)>;
// A counter that increments via .push_back(), so it can be passed via template
// to substitute std::vector<T>, to count elements instead of storing them.
template <typename T>
class CountingVector {
public:
CountingVector() {}
void push_back(const T& /* unused */) { ++size_; }
size_t size() const { return size_; }
private:
size_t size_ = 0;
};
} // namespace courgette
#endif // COURGETTE_INSTRUCTION_UTILS_H_
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