Support object files larger than 2**32.

Reviewed at https://breakpad.appspot.com/7834002/#ps340001


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1453 4c0a9323-5329-0410-9bdc-e9ce6186880e

6 files changed, 187 insertions, 38 deletions

diff --git a/src/common/common.gyp b/src/common/common.gyp
index f01ede57..6ccd21a2 100644
--- a/src/common/common.gyp
+++ b/src/common/common.gyp
@@ -141,6 +141,7 @@
         'mac/scoped_task_suspend-inl.h',
         'mac/string_utilities.cc',
         'mac/string_utilities.h',
+        'mac/super_fat_arch.h',
         'md5.cc',
         'md5.h',
         'memory.h',
diff --git a/src/common/mac/dump_syms.h b/src/common/mac/dump_syms.h
index 34e83976..babed701 100644
--- a/src/common/mac/dump_syms.h
+++ b/src/common/mac/dump_syms.h
@@ -46,6 +46,7 @@
 
 #include "common/byte_cursor.h"
 #include "common/mac/macho_reader.h"
+#include "common/mac/super_fat_arch.h"
 #include "common/module.h"
 #include "common/symbol_data.h"
 
@@ -59,6 +60,7 @@ class DumpSymbols {
         input_pathname_(),
         object_filename_(),
         contents_(),
+        object_files_(),
         selected_object_file_(),
         selected_object_name_() { }
   ~DumpSymbols() {
@@ -98,14 +100,14 @@ class DumpSymbols {
   // architecture matches that of this dumper program.
   bool SetArchitecture(const std::string &arch_name);
 
-  // Return a pointer to an array of 'struct fat_arch' structures,
-  // describing the object files contained in this dumper's file. Set
-  // *|count| to the number of elements in the array. The returned array is
-  // owned by this DumpSymbols instance.
+  // Return a pointer to an array of SuperFatArch structures describing the
+  // object files contained in this dumper's file. Set *|count| to the number
+  // of elements in the array. The returned array is owned by this DumpSymbols
+  // instance.
   //
   // If there are no available architectures, this function
   // may return NULL.
-  const struct fat_arch *AvailableArchitectures(size_t *count) {
+  const SuperFatArch* AvailableArchitectures(size_t *count) {
     *count = object_files_.size();
     if (object_files_.size() > 0)
       return &object_files_[0];
@@ -127,6 +129,11 @@ class DumpSymbols {
   class DumperLineToModule;
   class LoadCommandDumper;
 
+  // This method behaves similarly to NXFindBestFatArch, but it supports
+  // SuperFatArch.
+  SuperFatArch* FindBestMatchForArchitecture(
+      cpu_type_t cpu_type, cpu_subtype_t cpu_subtype);
+
   // Return an identifier string for the file this DumpSymbols is dumping.
   std::string Identifier();
 
@@ -167,15 +174,15 @@ class DumpSymbols {
   // The complete contents of object_filename_, mapped into memory.
   NSData *contents_;
 
-  // A vector of fat_arch structures describing the object files
+  // A vector of SuperFatArch structures describing the object files
   // object_filename_ contains. If object_filename_ refers to a fat binary,
   // this may have more than one element; if it refers to a Mach-O file, this
   // has exactly one element.
-  vector<struct fat_arch> object_files_;
+  vector<SuperFatArch> object_files_;
 
   // The object file in object_files_ selected to dump, or NULL if
   // SetArchitecture hasn't been called yet.
-  const struct fat_arch *selected_object_file_;
+  const SuperFatArch *selected_object_file_;
 
   // A string that identifies the selected object file, for use in error
   // messages.  This is usually object_filename_, but if that refers to a
diff --git a/src/common/mac/dump_syms.mm b/src/common/mac/dump_syms.mm
index f2420f17..58cf4c20 100644
--- a/src/common/mac/dump_syms.mm
+++ b/src/common/mac/dump_syms.mm
@@ -35,6 +35,7 @@
 
 #include "common/mac/dump_syms.h"
 
+#include <assert.h>
 #include <Foundation/Foundation.h>
 #include <mach-o/arch.h>
 #include <mach-o/fat.h>
@@ -170,7 +171,7 @@ bool DumpSymbols::Read(NSString *filename) {
 
   // Get our own copy of fat_reader's object file list.
   size_t object_files_count;
-  const struct fat_arch *object_files =
+  const SuperFatArch *object_files =
     fat_reader.object_files(&object_files_count);
   if (object_files_count == 0) {
     fprintf(stderr, "Fat binary file contains *no* architectures: %s\n",
@@ -179,7 +180,7 @@ bool DumpSymbols::Read(NSString *filename) {
   }
   object_files_.resize(object_files_count);
   memcpy(&object_files_[0], object_files,
-         sizeof(struct fat_arch) * object_files_count);
+         sizeof(SuperFatArch) * object_files_count);
 
   return true;
 }
@@ -187,9 +188,8 @@ bool DumpSymbols::Read(NSString *filename) {
 bool DumpSymbols::SetArchitecture(cpu_type_t cpu_type,
                                   cpu_subtype_t cpu_subtype) {
   // Find the best match for the architecture the user requested.
-  const struct fat_arch *best_match
-    = NXFindBestFatArch(cpu_type, cpu_subtype, &object_files_[0],
-                        static_cast<uint32_t>(object_files_.size()));
+  const SuperFatArch *best_match = FindBestMatchForArchitecture(
+      cpu_type, cpu_subtype);
   if (!best_match) return false;
 
   // Record the selected object file.
@@ -207,6 +207,56 @@ bool DumpSymbols::SetArchitecture(const std::string &arch_name) {
   return arch_set;
 }
 
+SuperFatArch* DumpSymbols::FindBestMatchForArchitecture(
+    cpu_type_t cpu_type, cpu_subtype_t cpu_subtype) {
+  // Check if all the object files can be converted to struct fat_arch.
+  bool can_convert_to_fat_arch = true;
+  vector<struct fat_arch> fat_arch_vector;
+  for (vector<SuperFatArch>::const_iterator it = object_files_.begin();
+       it != object_files_.end();
+       ++it) {
+    struct fat_arch arch;
+    bool success = it->ConvertToFatArch(&arch);
+    if (!success) {
+      can_convert_to_fat_arch = false;
+      break;
+    }
+    fat_arch_vector.push_back(arch);
+  }
+
+  // If all the object files can be converted to struct fat_arch, use
+  // NXFindBestFatArch.
+  if (can_convert_to_fat_arch) {
+    const struct fat_arch *best_match
+      = NXFindBestFatArch(cpu_type, cpu_subtype, &fat_arch_vector[0],
+                          static_cast<uint32_t>(fat_arch_vector.size()));
+
+    for (size_t i = 0; i < fat_arch_vector.size(); ++i) {
+      if (best_match == &fat_arch_vector[i])
+        return &object_files_[i];
+    }
+    assert(best_match == NULL);
+    return NULL;
+  }
+
+  // Check for an exact match with cpu_type and cpu_subtype.
+  for (vector<SuperFatArch>::iterator it = object_files_.begin();
+       it != object_files_.end();
+       ++it) {
+    if (it->cputype == cpu_type && it->cpusubtype == cpu_subtype)
+      return &*it;
+  }
+
+  // No exact match found.
+  // TODO(erikchen): If it becomes necessary, we can copy the implementation of
+  // NXFindBestFatArch, located at
+  // http://web.mit.edu/darwin/src/modules/cctools/libmacho/arch.c.
+  fprintf(stderr, "Failed to find an exact match for an object file with cpu "
+      "type: %d and cpu subtype: %d. Furthermore, at least one object file is "
+      "larger than 2**32.\n", cpu_type, cpu_subtype);
+  return NULL;
+}
+
 string DumpSymbols::Identifier() {
   FileID file_id([object_filename_ fileSystemRepresentation]);
   unsigned char identifier_bytes[16];
diff --git a/src/common/mac/macho_reader.cc b/src/common/mac/macho_reader.cc
index 84b595a3..9fcb58e3 100644
--- a/src/common/mac/macho_reader.cc
+++ b/src/common/mac/macho_reader.cc
@@ -101,22 +101,26 @@ bool FatReader::Read(const uint8_t *buffer, size_t size) {
       // Read the list of object files.
       object_files_.resize(object_files_count);
       for (size_t i = 0; i < object_files_count; i++) {
-        struct fat_arch *objfile = &object_files_[i];
+        struct fat_arch objfile;
 
         // Read this object file entry, byte-swapping as appropriate.
-        cursor >> objfile->cputype
-               >> objfile->cpusubtype
-               >> objfile->offset
-               >> objfile->size
-               >> objfile->align;
+        cursor >> objfile.cputype
+               >> objfile.cpusubtype
+               >> objfile.offset
+               >> objfile.size
+               >> objfile.align;
+
+        SuperFatArch super_fat_arch(objfile);
+        object_files_[i] = super_fat_arch;
+
         if (!cursor) {
           reporter_->TooShort();
           return false;
         }
         // Does the file actually have the bytes this entry refers to?
         size_t fat_size = buffer_.Size();
-        if (objfile->offset > fat_size ||
-            objfile->size > fat_size - objfile->offset) {
+        if (objfile.offset > fat_size ||
+            objfile.size > fat_size - objfile.offset) {
           reporter_->MisplacedObjectFile();
           return false;
         }
@@ -139,16 +143,14 @@ bool FatReader::Read(const uint8_t *buffer, size_t size) {
       }
 
       object_files_[0].offset = 0;
-      object_files_[0].size = static_cast<uint32_t>(buffer_.Size());
+      object_files_[0].size = static_cast<uint64_t>(buffer_.Size());
       // This alignment is correct for 32 and 64-bit x86 and ppc.
       // See get_align in the lipo source for other architectures:
       // http://www.opensource.apple.com/source/cctools/cctools-773/misc/lipo.c
       object_files_[0].align = 12;  // 2^12 == 4096
-      
       return true;
     }
   }
-  
   reporter_->BadHeader();
   return false;
 }
@@ -315,7 +317,7 @@ bool Reader::WalkLoadCommands(Reader::LoadCommandHandler *handler) const {
     // remainder of the load command series.
     ByteBuffer command(list_cursor.here(), list_cursor.Available());
     ByteCursor cursor(&command, big_endian_);
-    
+
     // Read the command type and size --- fields common to all commands.
     uint32_t type, size;
     if (!(cursor >> type)) {
@@ -400,7 +402,7 @@ bool Reader::WalkLoadCommands(Reader::LoadCommandHandler *handler) const {
           return false;
         break;
       }
-      
+
       default: {
         if (!handler->UnknownCommand(type, command))
           return false;
@@ -419,7 +421,7 @@ class Reader::SegmentFinder : public LoadCommandHandler {
  public:
   // Create a load command handler that looks for a segment named NAME,
   // and sets SEGMENT to describe it if found.
-  SegmentFinder(const string &name, Segment *segment) 
+  SegmentFinder(const string &name, Segment *segment)
       : name_(name), segment_(segment), found_() { }
 
   // Return true if the traversal found the segment, false otherwise.
@@ -482,7 +484,7 @@ bool Reader::WalkSegmentSections(const Segment &segment,
     if ((section.flags & SECTION_TYPE) == S_ZEROFILL) {
       // Zero-fill sections have a size, but no contents.
       section.contents.start = section.contents.end = NULL;
-    } else if (segment.contents.start == NULL && 
+    } else if (segment.contents.start == NULL &&
                segment.contents.end == NULL) {
       // Mach-O files in .dSYM bundles have the contents of the loaded
       // segments removed, and their file offsets and file sizes zeroed
diff --git a/src/common/mac/macho_reader.h b/src/common/mac/macho_reader.h
index 75376482..30db742d 100644
--- a/src/common/mac/macho_reader.h
+++ b/src/common/mac/macho_reader.h
@@ -47,6 +47,7 @@
 #include <vector>
 
 #include "common/byte_cursor.h"
+#include "common/mac/super_fat_arch.h"
 
 namespace google_breakpad {
 namespace mach_o {
@@ -93,7 +94,7 @@ class FatReader {
     // complete header, or the header implies that contents are present
     // beyond the actual end of the file.
     virtual void TooShort();
-  
+
    private:
     // The filename to which the reader should attribute problems.
     string filename_;
@@ -101,7 +102,7 @@ class FatReader {
 
   // Create a fat binary file reader that uses |reporter| to report problems.
   explicit FatReader(Reporter *reporter) : reporter_(reporter) { }
-  
+
   // Read the |size| bytes at |buffer| as a fat binary file. On success,
   // return true; on failure, report the problem to reporter_ and return
   // false.
@@ -111,13 +112,13 @@ class FatReader {
   // single object file is the Mach-O file.
   bool Read(const uint8_t *buffer, size_t size);
 
-  // Return an array of 'struct fat_arch' structures describing the
+  // Return an array of 'SuperFatArch' structures describing the
   // object files present in this fat binary file. Set |size| to the
   // number of elements in the array.
   //
-  // Assuming Read returned true, the entries are validated: it is
-  // safe to assume that the offsets and sizes in each 'struct
-  // fat_arch' refer to subranges of the bytes passed to Read.
+  // Assuming Read returned true, the entries are validated: it is safe to
+  // assume that the offsets and sizes in each SuperFatArch refer to subranges
+  // of the bytes passed to Read.
   //
   // If there are no object files in this fat binary, then this
   // function can return NULL.
@@ -129,7 +130,7 @@ class FatReader {
   // possible to use the result with OS X functions like NXFindBestFatArch,
   // so that the symbol dumper will behave consistently with other OS X
   // utilities that work with fat binaries.
-  const struct fat_arch *object_files(size_t *count) const { 
+  const SuperFatArch* object_files(size_t *count) const {
     *count = object_files_.size();
     if (object_files_.size() > 0)
       return &object_files_[0];
@@ -149,7 +150,7 @@ class FatReader {
 
   // The list of object files in this binary.
   // object_files_.size() == fat_header.nfat_arch
-  vector<struct fat_arch> object_files_;
+  vector<SuperFatArch> object_files_;
 };
 
 // A segment in a Mach-O file. All these fields have been byte-swapped as
@@ -177,7 +178,7 @@ struct Segment {
   // The maximum and initial VM protection of this segment's contents.
   uint32_t maxprot;
   uint32_t initprot;
-  
+
   // The number of sections in section_list.
   uint32_t nsects;
 
@@ -376,7 +377,7 @@ class Reader {
     return Read(buffer.start,
                 buffer.Size(),
                 expected_cpu_type,
-                expected_cpu_subtype); 
+                expected_cpu_subtype);
   }
 
   // Return this file's characteristics, as found in the Mach-O header.
diff --git a/src/common/mac/super_fat_arch.h b/src/common/mac/super_fat_arch.h
new file mode 100644
index 00000000..501c8652
--- /dev/null
+++ b/src/common/mac/super_fat_arch.h
@@ -0,0 +1,88 @@
+// Copyright (c) 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Original author: Erik Chen <erikchen@chromium.org>
+
+// super_fat_arch.h: A class to handle 64-bit object files. Has conversions to
+// and from struct fat_arch.
+
+#ifndef BREAKPAD_COMMON_MAC_SUPER_FAT_ARCH_H_
+#define BREAKPAD_COMMON_MAC_SUPER_FAT_ARCH_H_
+
+#include <limits>
+#include <mach-o/fat.h>
+#include <stdint.h>
+
+// Similar to struct fat_arch, except size-related parameters support
+// 64-bits.
+class SuperFatArch {
+ public:
+  uint32_t cputype;
+  uint32_t cpusubtype;
+  uint64_t offset;
+  uint64_t size;
+  uint64_t align;
+
+  SuperFatArch() :
+      cputype(0),
+      cpusubtype(0),
+      offset(0),
+      size(0),
+      align(0) {
+  }
+
+  explicit SuperFatArch(const struct fat_arch &arch) :
+      cputype(arch.cputype),
+      cpusubtype(arch.cpusubtype),
+      offset(arch.offset),
+      size(arch.size),
+      align(arch.align) {
+  }
+
+  // Returns false if the conversion cannot be made.
+  // If the conversion succeeds, the result is placed in |output_arch|.
+  bool ConvertToFatArch(struct fat_arch* output_arch) const {
+    if (offset > std::numeric_limits<uint32_t>::max())
+      return false;
+    if (size > std::numeric_limits<uint32_t>::max())
+      return false;
+    if (align > std::numeric_limits<uint32_t>::max())
+      return false;
+    struct fat_arch arch;
+    arch.cputype = cputype;
+    arch.cpusubtype = cpusubtype;
+    arch.offset = offset;
+    arch.size = size;
+    arch.align = align;
+    *output_arch = arch;
+    return true;
+  }
+};
+
+#endif  // BREAKPAD_COMMON_MAC_SUPER_FAT_ARCH_H_