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// Copyright (c) 2011 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.
// This is the transformation and adjustment for all executables.
// The executable type is determined by ParseDetectedExecutable function.
#ifndef COURGETTE_WIN32_X86_GENERATOR_H_
#define COURGETTE_WIN32_X86_GENERATOR_H_
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "courgette/assembly_program.h"
#include "courgette/ensemble.h"
namespace courgette {
class PatchGeneratorX86_32 : public TransformationPatchGenerator {
public:
PatchGeneratorX86_32(Element* old_element,
Element* new_element,
PatcherX86_32* patcher,
ExecutableType kind)
: TransformationPatchGenerator(old_element, new_element, patcher),
kind_(kind) {
}
virtual ExecutableType Kind() { return kind_; }
Status WriteInitialParameters(SinkStream* parameter_stream) {
if (!parameter_stream->WriteSizeVarint32(
old_element_->offset_in_ensemble()) ||
!parameter_stream->WriteSizeVarint32(old_element_->region().length())) {
return C_STREAM_ERROR;
}
return C_OK;
// TODO(sra): Initialize |patcher_| with these parameters.
}
Status PredictTransformParameters(SinkStreamSet* prediction) {
return TransformationPatchGenerator::PredictTransformParameters(prediction);
}
Status CorrectedTransformParameters(SinkStreamSet* parameters) {
// No code needed to write an 'empty' parameter set.
return C_OK;
}
// The format of a transformed_element is a serialized EncodedProgram. We
// first disassemble the original old and new Elements into AssemblyPrograms.
// Then we adjust the new AssemblyProgram to make it as much like the old one
// as possible, before converting the AssemblyPrograms to EncodedPrograms and
// serializing them.
Status Transform(SourceStreamSet* corrected_parameters,
SinkStreamSet* old_transformed_element,
SinkStreamSet* new_transformed_element) {
// Don't expect any corrected parameters.
if (!corrected_parameters->Empty())
return C_GENERAL_ERROR;
// Generate old version of program using |corrected_parameters|.
// TODO(sra): refactor to use same code from patcher_.
AssemblyProgram* old_program = NULL;
Status old_parse_status =
ParseDetectedExecutable(old_element_->region().start(),
old_element_->region().length(),
&old_program);
if (old_parse_status != C_OK) {
LOG(ERROR) << "Cannot parse an executable " << old_element_->Name();
return old_parse_status;
}
AssemblyProgram* new_program = NULL;
Status new_parse_status =
ParseDetectedExecutable(new_element_->region().start(),
new_element_->region().length(),
&new_program);
if (new_parse_status != C_OK) {
DeleteAssemblyProgram(old_program);
LOG(ERROR) << "Cannot parse an executable " << new_element_->Name();
return new_parse_status;
}
// Trim labels below a certain threshold
Status trim_old_status = TrimLabels(old_program);
if (trim_old_status != C_OK) {
DeleteAssemblyProgram(old_program);
return trim_old_status;
}
Status trim_new_status = TrimLabels(new_program);
if (trim_new_status != C_OK) {
DeleteAssemblyProgram(new_program);
return trim_new_status;
}
EncodedProgram* old_encoded = NULL;
Status old_encode_status = Encode(old_program, &old_encoded);
if (old_encode_status != C_OK) {
DeleteAssemblyProgram(old_program);
return old_encode_status;
}
Status old_write_status =
WriteEncodedProgram(old_encoded, old_transformed_element);
DeleteEncodedProgram(old_encoded);
if (old_write_status != C_OK) {
DeleteAssemblyProgram(old_program);
return old_write_status;
}
Status adjust_status = Adjust(*old_program, new_program);
DeleteAssemblyProgram(old_program);
if (adjust_status != C_OK) {
DeleteAssemblyProgram(new_program);
return adjust_status;
}
EncodedProgram* new_encoded = NULL;
Status new_encode_status = Encode(new_program, &new_encoded);
DeleteAssemblyProgram(new_program);
if (new_encode_status != C_OK)
return new_encode_status;
Status new_write_status =
WriteEncodedProgram(new_encoded, new_transformed_element);
DeleteEncodedProgram(new_encoded);
if (new_write_status != C_OK)
return new_write_status;
return C_OK;
}
Status Reform(SourceStreamSet* transformed_element,
SinkStream* reformed_element) {
return TransformationPatchGenerator::Reform(transformed_element,
reformed_element);
}
private:
virtual ~PatchGeneratorX86_32() { }
ExecutableType kind_;
DISALLOW_COPY_AND_ASSIGN(PatchGeneratorX86_32);
};
} // namespace courgette
#endif // COURGETTE_WIN32_X86_GENERATOR_H_
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