1 // Copyright 2011 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 #include "courgette/assembly_program.h"
9 #include "courgette/encoded_program.h"
10 #include "courgette/instruction_utils.h"
16 // An instruction receptor that adds each received abs32/rel32 Label* to the
17 // matching VECTOR member variable. Template VECTOR allows code reuse for
18 // counting (CountingVector) and storage (std::vector).
19 template <template <typename T, typename... Args> class CONTAINER>
20 class LabelReceptor : public InstructionReceptor {
22 using VECTOR = CONTAINER<Label*>;
24 LabelReceptor() = default;
26 LabelReceptor(const LabelReceptor&) = delete;
27 LabelReceptor& operator=(const LabelReceptor&) = delete;
29 ~LabelReceptor() override = default;
31 VECTOR* mutable_abs32_vector() { return &abs32_vector_; }
32 VECTOR* mutable_rel32_vector() { return &rel32_vector_; }
34 // InstructionReceptor:
35 CheckBool EmitPeRelocs() override { return true; }
36 CheckBool EmitElfRelocation() override { return true; }
37 CheckBool EmitOrigin(RVA rva) override { return true; }
38 CheckBool EmitSingleByte(uint8_t byte) override { return true; }
39 CheckBool EmitMultipleBytes(const uint8_t* bytes, size_t len) override {
42 CheckBool EmitRel32(Label* label) override {
43 rel32_vector_.push_back(label);
46 CheckBool EmitAbs32(Label* label) override {
47 abs32_vector_.push_back(label);
50 CheckBool EmitAbs64(Label* label) override {
51 abs32_vector_.push_back(label);
62 AssemblyProgram::AssemblyProgram(ExecutableType kind, uint64_t image_base)
63 : kind_(kind), image_base_(image_base) {}
65 AssemblyProgram::~AssemblyProgram() = default;
67 void AssemblyProgram::PrecomputeLabels(RvaVisitor* abs32_visitor,
68 RvaVisitor* rel32_visitor) {
69 abs32_label_manager_.Read(abs32_visitor);
70 rel32_label_manager_.Read(rel32_visitor);
73 void AssemblyProgram::UnassignIndexes() {
74 abs32_label_manager_.UnassignIndexes();
75 rel32_label_manager_.UnassignIndexes();
78 void AssemblyProgram::DefaultAssignIndexes() {
79 abs32_label_manager_.DefaultAssignIndexes();
80 rel32_label_manager_.DefaultAssignIndexes();
83 void AssemblyProgram::AssignRemainingIndexes() {
84 abs32_label_manager_.AssignRemainingIndexes();
85 rel32_label_manager_.AssignRemainingIndexes();
88 Label* AssemblyProgram::FindAbs32Label(RVA rva) {
89 return abs32_label_manager_.Find(rva);
92 Label* AssemblyProgram::FindRel32Label(RVA rva) {
93 return rel32_label_manager_.Find(rva);
96 CheckBool AssemblyProgram::AnnotateLabels(const InstructionGenerator& gen) {
97 // Pass 1: Compute required space.
98 LabelReceptor<CountingVector> count_receptor;
99 if (!gen.Run(&count_receptor))
102 // Pass 2: Reserve and store annotations.
103 LabelReceptor<std::vector> annotate_receptor;
104 annotate_receptor.mutable_abs32_vector()->reserve(
105 count_receptor.mutable_abs32_vector()->size());
106 annotate_receptor.mutable_rel32_vector()->reserve(
107 count_receptor.mutable_rel32_vector()->size());
108 if (!gen.Run(&annotate_receptor))
111 // Move results to |abs32_label_annotations_| and |re32_label_annotations_|.
112 abs32_label_annotations_.swap(*annotate_receptor.mutable_abs32_vector());
113 rel32_label_annotations_.swap(*annotate_receptor.mutable_rel32_vector());
117 bool AssemblyProgram::PrepareEncodedProgram(EncodedProgram* encoded) const {
118 encoded->set_image_base(image_base_);
119 return encoded->ImportLabels(abs32_label_manager_, rel32_label_manager_);
122 } // namespace courgette