Added a switch to dump minidump modules in minidump_stackwalk.

In order to figure out what symbols we need associated to a minidump,
it is useful to be able to dump all the modules the minidump contains.

A=dyen@chromium.org
Original Review: https://codereview.chromium.org/1651593002/
BUG=563716
R=dyen@chromium.org

Review URL: https://codereview.chromium.org/1650713002 .

src/processor/minidump_stackwalk.cc

@@ -71,7 +71,8 @@ using google_breakpad::scoped_ptr;
 bool PrintMinidumpProcess(const string &minidump_file,
                           const std::vector<string> &symbol_paths,
                           bool machine_readable,
-                          bool output_stack_contents) {
+                          bool output_stack_contents,
+                          bool output_modules_only) {
   scoped_ptr<SimpleSymbolSupplier> symbol_supplier;
   if (!symbol_paths.empty()) {
     // TODO(mmentovai): check existence of symbol_path if specified?
@@ -94,7 +95,9 @@ bool PrintMinidumpProcess(const string &minidump_file,
     return false;
   }
 
-  if (machine_readable) {
+  if (output_modules_only) {
+    PrintProcessModules(process_state);
+  } else if (machine_readable) {
     PrintProcessStateMachineReadable(process_state);
   } else {
     PrintProcessState(process_state, output_stack_contents, &resolver);
@@ -104,9 +107,10 @@ bool PrintMinidumpProcess(const string &minidump_file,
 }
 
 void usage(const char *program_name) {
-  fprintf(stderr, "usage: %s [-m|-s] <minidump-file> [symbol-path ...]\n"
+  fprintf(stderr, "usage: %s [-m|-s|-b] <minidump-file> [symbol-path ...]\n"
           "    -m : Output in machine-readable format\n"
-          "    -s : Output stack contents\n",
+          "    -s : Output stack contents\n"
+          "    -b : Output contained full module paths\n",
           program_name);
 }
 
@@ -123,6 +127,7 @@ int main(int argc, char **argv) {
   const char *minidump_file;
   bool machine_readable = false;
   bool output_stack_contents = false;
+  bool output_modules_only = false;
   int symbol_path_arg;
 
   if (strcmp(argv[1], "-m") == 0) {
@@ -143,6 +148,15 @@ int main(int argc, char **argv) {
     output_stack_contents = true;
     minidump_file = argv[2];
     symbol_path_arg = 3;
+  } else if (strcmp(argv[1], "-b") == 0) {
+    if (argc < 3) {
+      usage(argv[0]);
+      return 1;
+    }
+
+    output_modules_only = true;
+    minidump_file = argv[2];
+    symbol_path_arg = 3;
   } else {
     minidump_file = argv[1];
     symbol_path_arg = 2;
@@ -158,5 +172,6 @@ int main(int argc, char **argv) {
   return PrintMinidumpProcess(minidump_file,
                               symbol_paths,
                               machine_readable,
-                              output_stack_contents) ? 0 : 1;
+                              output_stack_contents,
+                              output_modules_only) ? 0 : 1;
 }

src/processor/stackwalk_common.cc

@@ -926,4 +926,13 @@ void PrintProcessStateMachineReadable(const ProcessState& process_state) {
   }
 }
 
+void PrintProcessModules(const ProcessState& process_state) {
+  const CodeModules* modules = process_state.modules();
+  const unsigned int module_count = modules->module_count();
+  for (unsigned int i = 0; i < module_count; ++i) {
+    const CodeModule* module = modules->GetModuleAtSequence(i);
+    printf("%s\n", module->code_file().c_str());
+  }
+}
+
 }  // namespace google_breakpad

src/processor/stackwalk_common.h

@@ -43,6 +43,7 @@ void PrintProcessStateMachineReadable(const ProcessState& process_state);
 void PrintProcessState(const ProcessState& process_state,
                        bool output_stack_contents,
                        SourceLineResolverInterface* resolver);
+void PrintProcessModules(const ProcessState& process_state);
 
 }  // namespace google_breakpad