| // Copyright 2016 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. |
| |
| #ifndef COURGETTE_INSTRUCTION_UTILS_H_ |
| #define COURGETTE_INSTRUCTION_UTILS_H_ |
| |
| #include <stdint.h> |
| |
| #include "base/callback.h" |
| #include "base/macros.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; |
| 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; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(InstructionReceptor); |
| }; |
| |
| // 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_ |