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+// -*- mode: C++ -*-
+
+// 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
+// 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: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
+
+// Mock classes for writing stackwalker tests, shared amongst architectures.
+
+#ifndef PROCESSOR_STACKWALKER_UNITTEST_UTILS_H_
+#define PROCESSOR_STACKWALKER_UNITTEST_UTILS_H_
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string>
+#include <vector>
+
+#include "common/using_std_string.h"
+#include "google_breakpad/common/breakpad_types.h"
+#include "google_breakpad/processor/code_module.h"
+#include "google_breakpad/processor/code_modules.h"
+#include "google_breakpad/processor/memory_region.h"
+#include "google_breakpad/processor/symbol_supplier.h"
+#include "google_breakpad/processor/system_info.h"
+#include "processor/linked_ptr.h"
+
+class MockMemoryRegion: public google_breakpad::MemoryRegion {
+ public:
+  MockMemoryRegion(): base_address_(0) { }
+
+  // Set this region's address and contents. If we have placed an
+  // instance of this class in a test fixture class, individual tests
+  // can use this to provide the region's contents.
+  void Init(uint64_t base_address, const string &contents) {
+    base_address_ = base_address;
+    contents_ = contents;
+  }
+
+  uint64_t GetBase() const { return base_address_; }
+  uint32_t GetSize() const { return contents_.size(); }
+
+  bool GetMemoryAtAddress(uint64_t address, uint8_t  *value) const {
+    return GetMemoryLittleEndian(address, value);
+  }
+  bool GetMemoryAtAddress(uint64_t address, uint16_t *value) const {
+    return GetMemoryLittleEndian(address, value);
+  }
+  bool GetMemoryAtAddress(uint64_t address, uint32_t *value) const {
+    return GetMemoryLittleEndian(address, value);
+  }
+  bool GetMemoryAtAddress(uint64_t address, uint64_t *value) const {
+    return GetMemoryLittleEndian(address, value);
+  }
+  void Print() const {
+    assert(false);
+  }
+
+ private:
+  // Fetch a little-endian value from ADDRESS in contents_ whose size
+  // is BYTES, and store it in *VALUE. Return true on success.
+  template<typename ValueType>
+  bool GetMemoryLittleEndian(uint64_t address, ValueType *value) const {
+    if (address < base_address_ ||
+        address - base_address_ + sizeof(ValueType) > contents_.size())
+      return false;
+    ValueType v = 0;
+    int start = address - base_address_;
+    // The loop condition is odd, but it's correct for size_t.
+    for (size_t i = sizeof(ValueType) - 1; i < sizeof(ValueType); i--)
+      v = (v << 8) | static_cast<unsigned char>(contents_[start + i]);
+    *value = v;
+    return true;
+  }
+
+  uint64_t base_address_;
+  string contents_;
+};
+
+class MockCodeModule: public google_breakpad::CodeModule {
+ public:
+  MockCodeModule(uint64_t base_address, uint64_t size,
+                 const string &code_file, const string &version)
+      : base_address_(base_address), size_(size), code_file_(code_file) { }
+
+  uint64_t base_address()       const { return base_address_; }
+  uint64_t size()               const { return size_; }
+  string code_file()        const { return code_file_; }
+  string code_identifier()  const { return code_file_; }
+  string debug_file()       const { return code_file_; }
+  string debug_identifier() const { return code_file_; }
+  string version()          const { return version_; }
+  google_breakpad::CodeModule *Copy() const {
+    abort(); // Tests won't use this.
+  }
+  virtual bool is_unloaded() const { return false; }
+  virtual uint64_t shrink_down_delta() const { return 0; }
+  virtual void SetShrinkDownDelta(uint64_t shrink_down_delta) {}
+
+ private:
+  uint64_t base_address_;
+  uint64_t size_;
+  string code_file_;
+  string version_;
+};
+
+class MockCodeModules: public google_breakpad::CodeModules {
+ public:
+  typedef google_breakpad::CodeModule CodeModule;
+  typedef google_breakpad::CodeModules CodeModules;
+
+  void Add(const MockCodeModule *module) {
+    modules_.push_back(module);
+  }
+
+  unsigned int module_count() const { return modules_.size(); }
+
+  const CodeModule *GetModuleForAddress(uint64_t address) const {
+    for (ModuleVector::const_iterator i = modules_.begin();
+         i != modules_.end(); i++) {
+      const MockCodeModule *module = *i;
+      if (module->base_address() <= address &&
+          address - module->base_address() < module->size())
+        return module;
+    }
+    return NULL;
+  };
+
+  const CodeModule *GetMainModule() const { return modules_[0]; }
+
+  const CodeModule *GetModuleAtSequence(unsigned int sequence) const {
+    return modules_.at(sequence);
+  }
+
+  const CodeModule *GetModuleAtIndex(unsigned int index) const {
+    return modules_.at(index);
+  }
+
+  CodeModules *Copy() const { abort(); }  // Tests won't use this
+
+  virtual std::vector<google_breakpad::linked_ptr<const CodeModule> >
+  GetShrunkRangeModules() const {
+    return std::vector<google_breakpad::linked_ptr<const CodeModule> >();
+  }
+
+ private:
+  typedef std::vector<const MockCodeModule *> ModuleVector;
+  ModuleVector modules_;
+};
+
+class MockSymbolSupplier: public google_breakpad::SymbolSupplier {
+ public:
+  typedef google_breakpad::CodeModule CodeModule;
+  typedef google_breakpad::SystemInfo SystemInfo;
+  MOCK_METHOD3(GetSymbolFile, SymbolResult(const CodeModule *module,
+                                           const SystemInfo *system_info,
+                                           string *symbol_file));
+  MOCK_METHOD4(GetSymbolFile, SymbolResult(const CodeModule *module,
+                                           const SystemInfo *system_info,
+                                           string *symbol_file,
+                                           string *symbol_data));
+  MOCK_METHOD5(GetCStringSymbolData, SymbolResult(const CodeModule *module,
+                                                  const SystemInfo *system_info,
+                                                  string *symbol_file,
+                                                  char **symbol_data,
+                                                  size_t *symbol_data_size));
+  MOCK_METHOD1(FreeSymbolData, void(const CodeModule *module));
+
+  // Copies the passed string contents into a newly allocated buffer.
+  // The newly allocated buffer will be freed during destruction.
+  char* CopySymbolDataAndOwnTheCopy(const string &info,
+                                    size_t *symbol_data_size) {
+    *symbol_data_size = info.size() + 1;
+    char *symbol_data = new char[*symbol_data_size];
+    memcpy(symbol_data, info.c_str(), info.size());
+    symbol_data[info.size()] = '\0';
+    symbol_data_to_free_.push_back(symbol_data);
+    return symbol_data;
+  }
+
+  virtual ~MockSymbolSupplier() {
+    for (SymbolDataVector::const_iterator i = symbol_data_to_free_.begin();
+         i != symbol_data_to_free_.end(); i++) {
+      char* symbol_data = *i;
+      delete [] symbol_data;
+    }
+  }
+
+ private:
+  // List of symbol data to be freed upon destruction
+  typedef std::vector<char*> SymbolDataVector;
+  SymbolDataVector symbol_data_to_free_;
+};
+
+#endif // PROCESSOR_STACKWALKER_UNITTEST_UTILS_H_