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

courgette/disassembler.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_DISASSEMBLER_H_
 #define COURGETTE_DISASSEMBLER_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"
 
 namespace courgette {
 
 class AssemblyProgram;
+class EncodedProgram;
 
 class Disassembler : public AddressTranslator {
  public:
   // Visitor/adaptor to translate RVA to target RVA for abs32.
   class RvaVisitor_Abs32 : public VectorRvaVisitor<RVA> {
    public:
     RvaVisitor_Abs32(const std::vector<RVA>& rva_locations,
                      const AddressTranslator& translator);
     ~RvaVisitor_Abs32() override { }
 
@@ skipping 53 matching lines @@
   // because we may remove rel32 Labels along the way. As a result the matching
   // rel32 addresses become unused. Removing them saves space.
   virtual void RemoveUnusedRel32Locations(AssemblyProgram* program) = 0;
 
   // Extracts structural data from the main image. Returns true if the image
   // appears to be a valid executable of the expected type, or false otherwise.
   // This needs to be called before Disassemble().
   virtual bool ParseHeader() = 0;
 
   // Extracts and stores references from the main image. Returns a new
-  // AssemblyProgram initialized using data parsed from the main image and
-  // |annotate_labels|, or null on failure.
-  std::unique_ptr<AssemblyProgram> Disassemble(bool annotate_labels);
+  // AssemblyProgram with initialized Labels, or null on failure.
+  std::unique_ptr<AssemblyProgram> CreateProgram(bool annotate);
+
+  // Goes through the entire program (with the help of |program|), computes all
+  // instructions, and stores them into |encoded|.
+  Status DisassembleAndEncode(AssemblyProgram* program,
+                              EncodedProgram* encoded);
 
   // ok() may always be called but returns true only after ParseHeader()
   // succeeds.
   bool ok() const { return failure_reason_ == nullptr; }
 
   // Returns the length of the image. May reduce after ParseHeader().
   size_t length() const { return length_; }
   const uint8_t* start() const { return start_; }
   const uint8_t* end() const { return end_; }
 
@@ skipping 31 matching lines @@
   size_t length_;         // In current memory.
   const uint8_t* start_;  // In current memory, base for 'file offsets'.
   const uint8_t* end_;    // In current memory.
 
   DISALLOW_COPY_AND_ASSIGN(Disassembler);
 };
 
 }  // namespace courgette
 
 #endif  // COURGETTE_DISASSEMBLER_H_