Further refactoring, move ImageInfo into Disassembler/DisassemblerWin32X86.

This means that all PE specific knowledge is now contained in a single class
which leaves us in pretty good shape for supporting ELF 32.

There are still widespread assumptions about being 32 bit, but those can be
addressed at a much later date.

BUG=None
TEST=Unittests


Review URL: http://codereview.chromium.org/8166013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107260 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 105 insertions, 5 deletions

diff --git a/courgette/disassembler_win32_x86.h b/courgette/disassembler_win32_x86.h
index fe00b6d..733222f 100644
--- a/courgette/disassembler_win32_x86.h
+++ b/courgette/disassembler_win32_x86.h
@@ -7,8 +7,8 @@
 
 #include "base/basictypes.h"
 #include "courgette/disassembler.h"
-#include "courgette/image_info.h"
 #include "courgette/memory_allocator.h"
+#include "courgette/types_win_pe.h"
 
 namespace courgette {
 
@@ -16,13 +16,44 @@ class AssemblyProgram;
 
 class DisassemblerWin32X86 : public Disassembler {
  public:
-  explicit DisassemblerWin32X86(PEInfo* pe_info);
+  explicit DisassemblerWin32X86(const void* start, size_t length);
+
+  virtual ExecutableType kind() { return WIN32_X86; }
+
+  // Returns 'true' if the buffer appears to point to a Windows 32 bit
+  // executable, 'false' otherwise.  If ParseHeader() succeeds, other member
+  // functions may be called.
+  virtual bool ParseHeader();
 
   virtual bool Disassemble(AssemblyProgram* target);
 
- protected:
-  PEInfo& pe_info() { return *pe_info_; }
+  //
+  // Exposed for test purposes
+  //
+
+  bool has_text_section() const { return has_text_section_; }
+  uint32 size_of_code() const { return size_of_code_; }
+  bool is_32bit() const { return !is_PE32_plus_; }
+
+  // Returns 'true' if the base relocation table can be parsed.
+  // Output is a vector of the RVAs corresponding to locations within executable
+  // that are listed in the base relocation table.
+  bool ParseRelocs(std::vector<RVA> *addresses);
+
+  // Returns Section containing the relative virtual address, or NULL if none.
+  const Section* RVAToSection(RVA rva) const;
+
+  static const int kNoOffset = -1;
+  // Returns kNoOffset if there is no file offset corresponding to 'rva'.
+  int RVAToFileOffset(RVA rva) const;
 
+  // Returns same as FileOffsetToPointer(RVAToFileOffset(rva)) except that NULL
+  // is returned if there is no file offset corresponding to 'rva'.
+  const uint8* RVAToPointer(RVA rva) const;
+
+  static std::string SectionName(const Section* section);
+
+ protected:
   CheckBool ParseFile(AssemblyProgram* target) WARN_UNUSED_RESULT;
   bool ParseAbs32Relocs();
   void ParseRel32RelocsFromSections();
@@ -38,17 +69,86 @@ class DisassemblerWin32X86 : public Disassembler {
   void HistogramTargets(const char* kind, const std::map<RVA, int>& map);
 #endif
 
-  PEInfo* pe_info_;
+  // Most addresses are represented as 32-bit RVAs.  The one address we can't
+  // do this with is the image base address.  'image_base' is valid only for
+  // 32-bit executables. 'image_base_64' is valid for 32- and 64-bit executable.
+  uint32 image_base() const { return static_cast<uint32>(image_base_); }
+
+  const ImageDataDirectory& base_relocation_table() const {
+    return base_relocation_table_;
+  }
+
+  bool IsValidRVA(RVA rva) const { return rva < size_of_image_; }
+
+  // Returns description of the RVA, e.g. ".text+0x1243".  For debugging only.
+  std::string DescribeRVA(RVA rva) const;
+
+  // Finds the first section at file_offset or above.  Does not return sections
+  // that have no raw bytes in the file.
+  const Section* FindNextSection(uint32 file_offset) const;
+
+  // There are 2 'coordinate systems' for reasoning about executables.
+  //   FileOffset - the the offset within a single .EXE or .DLL *file*.
+  //   RVA - relative virtual address (offset within *loaded image*)
+  // FileOffsetToRVA and RVAToFileOffset convert between these representations.
+
+  RVA FileOffsetToRVA(uint32 offset) const;
+
+
+ private:
+
+  bool ReadDataDirectory(int index, ImageDataDirectory* dir);
+
   bool incomplete_disassembly_;  // 'true' if can leave out 'uninteresting' bits
 
   std::vector<RVA> abs32_locations_;
   std::vector<RVA> rel32_locations_;
 
+  //
+  // Fields that are always valid.
+  //
+
+  //
+  // Information that is valid after successful ParseHeader.
+  //
+  bool is_PE32_plus_;   // PE32_plus is for 64 bit executables.
+
+  // Location and size of IMAGE_OPTIONAL_HEADER in the buffer.
+  const uint8 *optional_header_;
+  uint16 size_of_optional_header_;
+  uint16 offset_of_data_directories_;
+
+  uint16 machine_type_;
+  uint16 number_of_sections_;
+  const Section *sections_;
+  bool has_text_section_;
+
+  uint32 size_of_code_;
+  uint32 size_of_initialized_data_;
+  uint32 size_of_uninitialized_data_;
+  RVA base_of_code_;
+  RVA base_of_data_;
+
+  uint64 image_base_;  // range limited to 32 bits for 32 bit executable
+  uint32 size_of_image_;
+  int number_of_data_directories_;
+
+  ImageDataDirectory export_table_;
+  ImageDataDirectory import_table_;
+  ImageDataDirectory resource_table_;
+  ImageDataDirectory exception_table_;
+  ImageDataDirectory base_relocation_table_;
+  ImageDataDirectory bound_import_table_;
+  ImageDataDirectory import_address_table_;
+  ImageDataDirectory delay_import_descriptor_;
+  ImageDataDirectory clr_runtime_header_;
+
 #if COURGETTE_HISTOGRAM_TARGETS
   std::map<RVA, int> abs32_target_rvas_;
   std::map<RVA, int> rel32_target_rvas_;
 #endif
 
+
   DISALLOW_COPY_AND_ASSIGN(DisassemblerWin32X86);
 };