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| 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef COURGETTE_ENCODED_PROGRAM_H_ | |
| 6 #define COURGETTE_ENCODED_PROGRAM_H_ | |
| 7 | |
| 8 #include <vector> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "third_party/courgette/image_info.h" | |
| 12 | |
| 13 namespace courgette { | |
| 14 | |
| 15 class SinkStream; | |
| 16 class SinkStreamSet; | |
| 17 class SourceStreamSet; | |
| 18 | |
| 19 // An EncodedProgram is a set of tables that contain a simple 'binary assembly | |
| 20 // language' that can be assembled to produce a sequence of bytes, for example, | |
| 21 // a Windows 32-bit executable. | |
| 22 // | |
| 23 class EncodedProgram { | |
| 24 public: | |
| 25 EncodedProgram(); | |
| 26 ~EncodedProgram(); | |
| 27 | |
| 28 // Generating an EncodedProgram: | |
| 29 // | |
| 30 // (1) The image base can be specified at any time. | |
| 31 void set_image_base(uint64 base) { image_base_ = base; } | |
| 32 | |
| 33 // (2) Address tables and indexes defined first. | |
| 34 void DefineRel32Label(int index, RVA address); | |
| 35 void DefineAbs32Label(int index, RVA address); | |
| 36 void EndLabels(); | |
| 37 | |
| 38 // (3) Add instructions in the order needed to generate bytes of file. | |
| 39 void AddOrigin(RVA rva); | |
| 40 void AddCopy(int count, const void* bytes); | |
| 41 void AddRel32(int label_index); | |
| 42 void AddAbs32(int label_index); | |
| 43 void AddMakeRelocs(); | |
| 44 | |
| 45 // (3) Serialize binary assembly language tables to a set of streams. | |
| 46 void WriteTo(SinkStreamSet *streams); | |
| 47 | |
| 48 // Using an EncodedProgram to generate a byte stream: | |
| 49 // | |
| 50 // (4) Deserializes a fresh EncodedProgram from a set of streams. | |
| 51 bool ReadFrom(SourceStreamSet *streams); | |
| 52 | |
| 53 // (5) Assembles the 'binary assembly language' into final file. | |
| 54 bool AssembleTo(SinkStream *buffer); | |
| 55 | |
| 56 private: | |
| 57 enum OP; // Binary assembly language operations. | |
| 58 | |
| 59 void DebuggingSummary(); | |
| 60 void GenerateBaseRelocations(SinkStream *buffer); | |
| 61 void DefineLabelCommon(std::vector<RVA>*, int, RVA); | |
| 62 void FinishLabelsCommon(std::vector<RVA>* addresses); | |
| 63 | |
| 64 // Binary assembly language tables. | |
| 65 uint64 image_base_; | |
| 66 std::vector<RVA> rel32_rva_; | |
| 67 std::vector<RVA> abs32_rva_; | |
| 68 std::vector<OP> ops_; | |
| 69 std::vector<RVA> origins_; | |
| 70 std::vector<int> copy_counts_; | |
| 71 std::vector<uint8> copy_bytes_; | |
| 72 std::vector<uint32> rel32_ix_; | |
| 73 std::vector<uint32> abs32_ix_; | |
| 74 | |
| 75 // Table of the addresses containing abs32 relocations; computed during | |
| 76 // assembly, used to generate base relocation table. | |
| 77 std::vector<uint32> abs32_relocs_; | |
| 78 | |
| 79 DISALLOW_COPY_AND_ASSIGN(EncodedProgram); | |
| 80 }; | |
| 81 | |
| 82 } // namespace courgette | |
| 83 #endif // COURGETTE_ENCODED_FORMAT_H_ | |
| 84 | |
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