Implement /proc/self/maps/ parsing code.

base/debug/proc_maps.h

+// Copyright (c) 2013 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 BASE_DEBUG_PROC_MAPS_H_
+#define BASE_DEBUG_PROC_MAPS_H_
+
+#include <string>
+#include <vector>
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+
+namespace base {
+namespace debug {
+
+#if defined(OS_LINUX) || defined(OS_ANDROID)
+
+// Describes a region of mapped memory and the path of the file mapped.
+// start:  Starting address of memory range.
+// end:    Ending address of memory range.
+// offset: The starting offset of the file that is mapped into memory.
+// path:   The path of the object file that is mapped into memory.
+struct MappedMemoryRegion {
+  uintptr_t start;
+  uintptr_t end;
+  size_t offset;
+  FilePath path;

[satorux1, 2013/07/01 03:59:56]

maybe add the permission bits? that info would be useful.

[scherkus (not reviewing), 2013/07/01 21:59:45]

Done. I'll make my stack trace code check for r+x bits.

+};
+
+// Reads the data from /proc/self/maps. Returns an empty string if unable to
+// do so.
+BASE_EXPORT std::string ReadProcMaps();
+
+// Parses /proc/<pid>/maps input data and stores in |regions|. Invalid input
+// data is skipped i.e., if |input| contains no valid data, then |regions|
+// will be empty.
+//
+// NOTE: Parsed path names aren't guaranteed to point at valid files. For
+// example, "[heap]" and "[stack]" are used to represent the location of the
+// process' heap and stack, respectively.
+BASE_EXPORT void ParseProcMaps(const std::string& input,

[satorux1, 2013/07/01 03:59:56]

Maybe return a boolean to report an error?

[scherkus (not reviewing), 2013/07/01 21:59:45]

Done, but made this function an all-or-nothing function (i.e., all of input must
be valid, whereas before it was more friendly to potentially garbage input --
personally I like stricter APIs)

+                               std::vector<MappedMemoryRegion>* regions);
+#endif
+
+}  // namespace debug
+}  // namespace base
+
+#endif  // BASE_DEBUG_PROC_MAPS_H_