[Courgette] Reduce AssemblyProgram to reduce Courgette-apply RAM floor and disk churn.

courgette/encoded_program_fuzz_unittest.cc

 // 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.
 
 // Fuzz testing for EncodedProgram serialized format and assembly.
 //
 // We would like some assurance that if an EncodedProgram is malformed we will
 // not crash.  The EncodedProgram could be malformed either due to malicious
 // attack to due to an error in patch generation.
 //
@@ skipping 28 matching lines @@
 // Loads an executable and does fuzz testing in the serialized format.
 void DecodeFuzzTest::FuzzExe(const char* file_name) const {
   std::string file1 = FileContents(file_name);
 
   const uint8_t* original_data = reinterpret_cast<const uint8_t*>(file1.data());
   size_t original_length = file1.length();
   courgette::CourgetteFlow flow;
 
   courgette::RegionBuffer original_buffer(
       courgette::Region(original_data, original_length));
-  flow.ReadAssemblyProgramFromBuffer(flow.ONLY, original_buffer, false);
+  flow.ReadDisassemblerFromBuffer(flow.ONLY, original_buffer);
+  EXPECT_EQ(courgette::C_OK, flow.status());
+  EXPECT_TRUE(nullptr != flow.data(flow.ONLY)->disassembler.get());
+
+  flow.CreateAssemblyProgramFromDisassembler(flow.ONLY, false);
   EXPECT_EQ(courgette::C_OK, flow.status());
   EXPECT_TRUE(nullptr != flow.data(flow.ONLY)->program.get());
 
-  flow.CreateEncodedProgramFromAssemblyProgram(flow.ONLY);
+  flow.CreateEncodedProgramFromDisassemblerAndAssemblyProgram(flow.ONLY);
   EXPECT_EQ(courgette::C_OK, flow.status());
   EXPECT_TRUE(nullptr != flow.data(flow.ONLY)->encoded.get());
 
   flow.DestroyAssemblyProgram(flow.ONLY);
   EXPECT_EQ(courgette::C_OK, flow.status());
   EXPECT_TRUE(nullptr == flow.data(flow.ONLY)->program.get());
 
+  flow.DestroyDisassembler(flow.ONLY);
+  EXPECT_EQ(courgette::C_OK, flow.status());
+  EXPECT_TRUE(nullptr == flow.data(flow.ONLY)->disassembler.get());
+
   flow.WriteSinkStreamSetFromEncodedProgram(flow.ONLY);
   EXPECT_EQ(courgette::C_OK, flow.status());
 
   flow.DestroyEncodedProgram(flow.ONLY);
   EXPECT_EQ(courgette::C_OK, flow.status());
   EXPECT_TRUE(nullptr == flow.data(flow.ONLY)->encoded.get());
 
   courgette::SinkStream sink;
   flow.WriteSinkStreamFromSinkStreamSet(flow.ONLY, &sink);
   EXPECT_EQ(courgette::C_OK, flow.status());
@@ skipping 129 matching lines @@
 }
 
 TEST_F(DecodeFuzzTest, All) {
   FuzzExe("setup1.exe");
   FuzzExe("elf-32-1.exe");
 }
 
 int main(int argc, char** argv) {
   return base::TestSuite(argc, argv).Run();
 }