Add support for Linux memory mapping stream and remove ELF header usage

src/google_breakpad/processor/minidump.h

 // Copyright (c) 2010 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
@@ skipping 70 matching lines @@
 
 #ifndef _WIN32
 #include <unistd.h>
 #endif
 
 #include <iostream>
 #include <map>
 #include <string>
 #include <vector>
 
+#include "common/basictypes.h"
 #include "common/using_std_string.h"
 #include "google_breakpad/processor/code_module.h"
 #include "google_breakpad/processor/code_modules.h"
 #include "google_breakpad/processor/dump_context.h"
 #include "google_breakpad/processor/dump_object.h"
 #include "google_breakpad/processor/memory_region.h"
+#include "google_breakpad/processor/proc_maps_linux.h"
 
 
 namespace google_breakpad {
 
 
 using std::map;
 using std::vector;
 
 
 class Minidump;
@@ skipping 694 matching lines @@
   // Return true if the memory protection allows writing.
   bool IsWritable() const;
 
   // Print a human-readable representation of the object to stdout.
   void Print();
 
  private:
   // These objects are managed by MinidumpMemoryInfoList.
   friend class MinidumpMemoryInfoList;
 
-  explicit MinidumpMemoryInfo(Minidump* minidump);
+  explicit MinidumpMemoryInfo(Minidump* minidump_);
 
   // This works like MinidumpStream::Read, but is driven by
   // MinidumpMemoryInfoList.  No size checking is done, because
   // MinidumpMemoryInfoList handles that directly.
   bool Read();
 
   MDRawMemoryInfo memory_info_;
 };
 
 // MinidumpMemoryInfoList contains a list of information about
@@ skipping 12 matching lines @@
   // Print a human-readable representation of the object to stdout.
   void Print();
 
  private:
   friend class Minidump;
 
   typedef vector<MinidumpMemoryInfo> MinidumpMemoryInfos;
 
   static const uint32_t kStreamType = MD_MEMORY_INFO_LIST_STREAM;
 
-  explicit MinidumpMemoryInfoList(Minidump* minidump);
+  explicit MinidumpMemoryInfoList(Minidump* minidump_);
 
   bool Read(uint32_t expected_size);
 
   // Access to memory info using addresses as the key.
   RangeMap<uint64_t, unsigned int> *range_map_;
 
   MinidumpMemoryInfos* infos_;
   uint32_t info_count_;
 };
 
+// MinidumpLinuxMaps wraps information about a single mapped memory region
+// from /proc/self/maps.
+class MinidumpLinuxMaps : public MinidumpObject {
+ public:
+  // The memory address of the base of the mapped region.
+  uint64_t GetBase() const { return valid_ ? region_.start : 0; }
+  // The size of the mapped region.
+  uint64_t GetSize() const { return valid_ ? region_.end - region_.start : 0; }
+
+  // The permissions of the mapped region.
+  bool IsReadable() const {
+    return valid_ ? region_.permissions & MappedMemoryRegion::READ : false;
+  }
+  bool IsWriteable() const {
+    return valid_ ? region_.permissions & MappedMemoryRegion::WRITE : false;
+  }
+  bool IsExecutable() const {
+    return valid_ ? region_.permissions & MappedMemoryRegion::EXECUTE : false;
+  }
+  bool IsPrivate() const {
+    return valid_ ? region_.permissions & MappedMemoryRegion::PRIVATE : false;
+  }
+
+  // The offset of the mapped region.
+  uint64_t GetOffset() const { return valid_ ? region_.offset : 0; }
+
+  // The major device number.
+  uint8_t GetMajorDevice() const { return valid_ ? region_.major_device : 0; }
+  // The minor device number.
+  uint8_t GetMinorDevice() const { return valid_ ? region_.minor_device : 0; }
+
+  // The inode of the mapped region.
+  uint64_t GetInode() const { return valid_ ? region_.inode : 0; }
+
+  // The pathname of the mapped region.
+  const string GetPathname() const { return valid_ ? region_.path : ""; }
+
+  // Print the contents of this mapping.
+  void Print();
+
+ private:
+  // These objects are managed by MinidumpLinuxMapsList.
+  friend class MinidumpLinuxMapsList;
+
+  // This caller owns the pointer.
+  explicit MinidumpLinuxMaps(Minidump *minidump);
+
+  // Read data about a single mapping from /proc/self/maps and load the data
+  // into this object. The input vector is in the same format as a line from
+  // /proc/self/maps.
+
+  // The memory region struct that this class wraps.
+  MappedMemoryRegion region_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpLinuxMaps);
+};
+
+// MinidumpLinuxMapsList corresponds to the Linux-exclusive MD_LINUX_MAPS
+// stream, which contains the contents of /prod/self/maps, which contains
+// the mapped memory regions and their access permissions.
+class MinidumpLinuxMapsList : public MinidumpStream {
+ public:
+  virtual ~MinidumpLinuxMapsList();
+
+  // Get mapping at the given memory address. The caller owns the pointer.
+  const MinidumpLinuxMaps *GetLinuxMapsForAddress(uint64_t address) const;
+  // Get mapping at the given index. The caller owns the pointer.
+  const MinidumpLinuxMaps *GetLinuxMapsAtIndex(unsigned int index) const;
+
+  // Print the contents of /proc/self/maps to stdout.
+  void Print();
+
+ private:
+  friend class Minidump;
+
+  typedef vector<MinidumpLinuxMaps *> MinidumpLinuxMappings;
+
+  static const uint32_t kStreamType = MD_LINUX_MAPS;
+
+  // The caller owns the pointer.
+  explicit MinidumpLinuxMapsList(Minidump *minidump);
+
+  // Read and load the contents of the process mapping data.
+  // The stream should have data in the form of /proc/self/maps.
+  // This method returns whether the stream was read successfully.
+  bool Read(uint32_t expected_size);
+
+  // The list of individual mappings.
+  MinidumpLinuxMappings *maps_;
+  // The number of mappings.
+  uint32_t maps_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpLinuxMapsList);
+};
 
 // Minidump is the user's interface to a minidump file.  It wraps MDRawHeader
 // and provides access to the minidump's top-level stream directory.
 class Minidump {
  public:
   // path is the pathname of a file containing the minidump.
   explicit Minidump(const string& path);
   // input is an istream wrapping minidump data. Minidump holds a
   // weak pointer to input, and the caller must ensure that the stream
   // is valid as long as the Minidump object is.
@@ skipping 40 matching lines @@
   virtual MinidumpThreadList* GetThreadList();
   virtual MinidumpModuleList* GetModuleList();
   virtual MinidumpMemoryList* GetMemoryList();
   virtual MinidumpException* GetException();
   virtual MinidumpAssertion* GetAssertion();
   virtual MinidumpSystemInfo* GetSystemInfo();
   virtual MinidumpMiscInfo* GetMiscInfo();
   virtual MinidumpBreakpadInfo* GetBreakpadInfo();
   virtual MinidumpMemoryInfoList* GetMemoryInfoList();
 
+  // The next method also calls GetStream, but is exclusive for Linux dumps.
+  virtual MinidumpLinuxMapsList *GetLinuxMapsList();
+
   // The next set of methods are provided for users who wish to access
   // data in minidump files directly, while leveraging the rest of
   // this class and related classes to handle the basic minidump
   // structure and known stream types.
 
   unsigned int GetDirectoryEntryCount() const {
     return valid_ ? header_.stream_count : 0;
   }
   const MDRawDirectory* GetDirectoryEntryAtIndex(unsigned int index) const;
 
@@ skipping 96 matching lines @@
   // construction or after a failed Read(); true following a successful
   // Read().
   bool                      valid_;
 };
 
 
 }  // namespace google_breakpad
 
 
 #endif  // GOOGLE_BREAKPAD_PROCESSOR_MINIDUMP_H__