Module API (#32). r=waylonis, bryner

- Introduces a standard API for dealing with modules.  MinidumpModule
   is now a concrete implementation of this API.  Code may interact with
   single modules using the CodeModule interface, and collections of
   modules using its container, the CodeModules interface.
 - CodeModule is used directly by SymbolSupplier implementations and
   SourceLineResolver.  Reliance on the specific implementation in
   MinidumpModule has been eliminated.
 - Module lists are now added to ProcessState objects.  Module references
   in each stack frame are now pointers to objects in these module lists.
 - The sample minidump_stackwalk tool prints the module list after printing
   all threads' stacks.

http://groups.google.com/group/airbag-dev/browse_frm/thread/a9c0550edde54cf8


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@74 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/basic_code_modules.cc

@@ -0,0 +1,112 @@
+// Copyright (c) 2006, 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.
+
+// basic_code_modules.cc: Contains all of the CodeModule objects that
+// were loaded into a single process.
+//
+// See basic_code_modules.h for documentation.
+//
+// Author: Mark Mentovai
+
+#include <cassert>
+
+#include "processor/basic_code_modules.h"
+#include "google_airbag/processor/code_module.h"
+#include "processor/linked_ptr.h"
+#include "processor/range_map-inl.h"
+
+namespace google_airbag {
+
+BasicCodeModules::BasicCodeModules(const CodeModules *that)
+    : main_address_(0),
+      map_(new RangeMap<u_int64_t, linked_ptr<const CodeModule> >()) {
+  assert(that);
+
+  const CodeModule *main_module = that->GetMainModule();
+  if (main_module)
+    main_address_ = main_module->base_address();
+
+  unsigned int count = that->module_count();
+  for (unsigned int module_sequence = 0;
+       module_sequence < count;
+       ++module_sequence) {
+    // Make a copy of the module and insert it into the map.  Use
+    // GetModuleAtIndex because ordering is unimportant when slurping the
+    // entire list, and GetModuleAtIndex may be faster than
+    // GetModuleAtSequence.
+    const CodeModule *module = that->GetModuleAtIndex(module_sequence)->Copy();
+    map_->StoreRange(module->base_address(), module->size(),
+                     linked_ptr<const CodeModule>(module));
+  }
+}
+
+BasicCodeModules::~BasicCodeModules() {
+  delete map_;
+}
+
+unsigned int BasicCodeModules::module_count() const {
+  return map_->GetCount();
+}
+
+const CodeModule* BasicCodeModules::GetModuleForAddress(
+    u_int64_t address) const {
+  linked_ptr<const CodeModule> module;
+  if (!map_->RetrieveRange(address, &module, NULL, NULL))
+    return NULL;
+
+  return module.get();
+}
+
+const CodeModule* BasicCodeModules::GetMainModule() const {
+  return GetModuleForAddress(main_address_);
+}
+
+const CodeModule* BasicCodeModules::GetModuleAtSequence(
+    unsigned int sequence) const {
+  linked_ptr<const CodeModule> module;
+  if (!map_->RetrieveRangeAtIndex(sequence, &module, NULL, NULL))
+    return NULL;
+
+  return module.get();
+}
+
+const CodeModule* BasicCodeModules::GetModuleAtIndex(
+    unsigned int index) const {
+  // This class stores everything in a RangeMap, without any more-efficient
+  // way to walk the list of CodeModule objects.  Implement GetModuleAtIndex
+  // using GetModuleAtSequence, which meets all of the requirements, and
+  // in addition, guarantees ordering.
+  return GetModuleAtSequence(index);
+}
+
+const CodeModules* BasicCodeModules::Copy() const {
+  return new BasicCodeModules(this);
+}
+
+}  // namespace google_airbag