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

courgette/encoded_program.h

 // 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.
 
 #ifndef COURGETTE_ENCODED_PROGRAM_H_
 #define COURGETTE_ENCODED_PROGRAM_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "courgette/courgette.h"
 #include "courgette/image_utils.h"
+#include "courgette/instruction_utils.h"
 #include "courgette/memory_allocator.h"
 #include "courgette/types_elf.h"
 
 namespace courgette {
 
 // Stream indexes.
 const int kStreamMisc = 0;
 const int kStreamOps = 1;
 const int kStreamBytes = 2;
 const int kStreamAbs32Indexes = 3;
@@ skipping 46 matching lines @@
   CheckBool WriteTo(SinkStreamSet* streams) WARN_UNUSED_RESULT;
 
   // Using an EncodedProgram to generate a byte stream:
   //
   // (4) Deserializes a fresh EncodedProgram from a set of streams.
   bool ReadFrom(SourceStreamSet* streams);
 
   // (5) Assembles the 'binary assembly language' into final file.
   CheckBool AssembleTo(SinkStream* buffer) WARN_UNUSED_RESULT;
 
+  // Calls |gen| to extract all instructions, which are then encoded and stored.
+  CheckBool GenerateInstructions(ExecutableType exe_type,
+                                 const InstructionGenerator& gen);
+
  private:
   // Binary assembly language operations.
   // These are part of the patch format. Reusing an existing value will
   // break backwards compatibility.
   enum OP {
     ORIGIN = 0,  // ORIGIN <rva> - set address for subsequent assembly.
     COPY = 1,    // COPY <count> <bytes> - copy bytes to output.
     COPY1 = 2,   // COPY1 <byte> - same as COPY 1 <byte>.
     REL32 = 3,   // REL32 <index> - emit rel32 encoded reference to address at
                  // address table offset <index>
@@ skipping 60 matching lines @@
 };
 
 // Deserializes program from a stream set to |*output|. Returns C_OK if
 // successful, otherwise assigns |*output| to null and returns an error status.
 Status ReadEncodedProgram(SourceStreamSet* source,
                           std::unique_ptr<EncodedProgram>* output);
 
 }  // namespace courgette
 
 #endif  // COURGETTE_ENCODED_PROGRAM_H_