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- // Copyright (c) 2012 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 "courgette/encoded_program.h"
- #include <stddef.h>
- #include <stdint.h>
- #include <memory>
- #include <vector>
- #include "courgette/image_utils.h"
- #include "courgette/label_manager.h"
- #include "courgette/streams.h"
- #include "testing/gtest/include/gtest/gtest.h"
- namespace courgette {
- namespace {
- // Helper class to instantiate RVAToLabel while managing allocation.
- class TestLabelManager : public LabelManager {
- public:
- void RawAddLabel(int index, RVA rva) {
- labels_.push_back(Label(rva, index)); // Don't care about |count_|.
- }
- };
- // Creates a simple new program with given addresses. The orders of elements
- // in |abs32_specs| and |rel32_specs| are important.
- std::unique_ptr<EncodedProgram> CreateTestProgram(
- const TestLabelManager& abs32_label_manager,
- const TestLabelManager& rel32_label_manager) {
- std::unique_ptr<EncodedProgram> program(new EncodedProgram());
- uint32_t base = 0x00900000;
- program->set_image_base(base);
- EXPECT_TRUE(program->ImportLabels(abs32_label_manager, rel32_label_manager));
- EXPECT_TRUE(program->AddOrigin(0)); // Start at base.
- // Add instructions. Since we're using TestLabelManager, Labels are sorted in
- // the order they're added via Add().
- for (const Label& label : abs32_label_manager.Labels())
- EXPECT_TRUE(program->AddAbs32(label.index_));
- for (const Label& label : rel32_label_manager.Labels())
- EXPECT_TRUE(program->AddRel32(label.index_));
- return program;
- }
- bool CompareSink(const uint8_t expected[],
- size_t num_expected,
- SinkStream* ss) {
- size_t n = ss->Length();
- if (num_expected != n)
- return false;
- const uint8_t* buffer = ss->Buffer();
- return memcmp(&expected[0], buffer, n) == 0;
- }
- } // namespace
- // Create a simple program with a few addresses and references and
- // check that the bits produced are as expected.
- TEST(EncodedProgramTest, Test) {
- // ABS32 index 7 <-- base + 4.
- TestLabelManager abs32_label_manager;
- abs32_label_manager.RawAddLabel(7, 4);
- // REL32 index 5 <-- base + 0.
- TestLabelManager rel32_label_manager;
- rel32_label_manager.RawAddLabel(5, 0);
- std::unique_ptr<EncodedProgram> program(
- CreateTestProgram(abs32_label_manager, rel32_label_manager));
- // Serialize and deserialize.
- SinkStreamSet sinks;
- EXPECT_TRUE(program->WriteTo(&sinks));
- program.reset();
- SinkStream sink;
- bool can_collect = sinks.CopyTo(&sink);
- EXPECT_TRUE(can_collect);
- const void* buffer = sink.Buffer();
- size_t length = sink.Length();
- SourceStreamSet sources;
- bool can_get_source_streams = sources.Init(buffer, length);
- EXPECT_TRUE(can_get_source_streams);
- std::unique_ptr<EncodedProgram> encoded2(new EncodedProgram());
- bool can_read = encoded2->ReadFrom(&sources);
- EXPECT_TRUE(can_read);
- // Finally, try to assemble.
- SinkStream assembled;
- bool can_assemble = encoded2->AssembleTo(&assembled);
- EXPECT_TRUE(can_assemble);
- encoded2.reset();
- const uint8_t golden[] = {
- 0x04, 0x00, 0x90,
- 0x00, // ABS32 to base + 4
- 0xF8, 0xFF, 0xFF,
- 0xFF // REL32 from next line to base + 2
- };
- EXPECT_TRUE(CompareSink(golden, std::size(golden), &assembled));
- }
- // A larger test with multiple addresses. We encode the program and check the
- // contents of the address streams.
- TEST(EncodedProgramTest, TestWriteAddress) {
- // Absolute addresses by index: [_, _, _, 2, _, 23, _, 11].
- TestLabelManager abs32_label_manager;
- abs32_label_manager.RawAddLabel(7, 11);
- abs32_label_manager.RawAddLabel(3, 2);
- abs32_label_manager.RawAddLabel(5, 23);
- // Relative addresses by index: [16, 7, _, 32].
- TestLabelManager rel32_label_manager;
- rel32_label_manager.RawAddLabel(0, 16);
- rel32_label_manager.RawAddLabel(3, 32);
- rel32_label_manager.RawAddLabel(1, 7);
- std::unique_ptr<EncodedProgram> program(
- CreateTestProgram(abs32_label_manager, rel32_label_manager));
- SinkStreamSet sinks;
- EXPECT_TRUE(program->WriteTo(&sinks));
- program.reset();
- // Check indexes and addresses in sinks.
- const uint8_t golden_abs32_indexes[] = {
- 0x03, 0x07, 0x03, 0x05 // 3 indexes: [7, 3, 5].
- };
- EXPECT_TRUE(CompareSink(golden_abs32_indexes, std::size(golden_abs32_indexes),
- sinks.stream(kStreamAbs32Indexes)));
- const uint8_t golden_rel32_indexes[] = {
- 0x03, 0x00, 0x03, 0x01 // 3 indexes: [0, 3, 1].
- };
- EXPECT_TRUE(CompareSink(golden_rel32_indexes, std::size(golden_rel32_indexes),
- sinks.stream(kStreamRel32Indexes)));
- // Addresses: [_, _, _, 2, _, 23, _, 11].
- // Padded: [0, 0, 0, 2, 2, 23, 23, 11].
- // Delta: [0, 0, 0, 2, 0, 21, 0, -12].
- // Hex: [0, 0, 0, 0x02, 0, 0x15, 0, 0xFFFFFFF4].
- // Complement neg: [0, 0, 0, 0x02, 0, 0x15, 0, (0x0B)].
- // Varint32 Signed: [0, 0, 0, 0x04, 0, 0x2A, 0, 0x17].
- const uint8_t golden_abs32_addresses[] = {
- 0x08, // 8 address deltas.
- 0x00, 0x00, 0x00, 0x04, 0x00, 0x2A, 0x00, 0x17,
- };
- EXPECT_TRUE(CompareSink(golden_abs32_addresses,
- std::size(golden_abs32_addresses),
- sinks.stream(kStreamAbs32Addresses)));
- // Addresses: [16, 7, _, 32].
- // Padded: [16, 7, 7, 32].
- // Delta: [16, -9, 0, 25].
- // Hex: [0x10, 0xFFFFFFF7, 0, 0x19].
- // Complement Neg: [0x10, (0x08), 0, 0x19].
- // Varint32 Signed: [0x20, 0x11, 0, 0x32].
- const uint8_t golden_rel32_addresses[] = {
- 0x04, // 4 address deltas.
- 0x20, 0x11, 0x00, 0x32,
- };
- EXPECT_TRUE(CompareSink(golden_rel32_addresses,
- std::size(golden_rel32_addresses),
- sinks.stream(kStreamRel32Addresses)));
- }
- } // namespace courgette
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