issue 170 - Report assertion type in minidump_stackwalk output. r=mark at http://breakpad.appspot.com/45001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@433 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/minidump.cc

@@ -243,6 +243,15 @@ static string* UTF16ToUTF8(const vector<u_int16_t>& in,
   return out.release();
 }
 
+// Return the smaller of the number of code units in the UTF-16 string,
+// not including the terminating null word, or maxlen.
+static size_t UTF16codeunits(const u_int16_t *string, size_t maxlen) {
+  size_t count = 0;
+  while (count < maxlen && string[count] != 0)
+    count++;
+  return count;
+}
+
 
 //
 // MinidumpObject
@@ -2768,6 +2777,109 @@ void MinidumpException::Print() {
   }
 }
 
+//
+// MinidumpAssertion
+//
+
+
+MinidumpAssertion::MinidumpAssertion(Minidump* minidump)
+    : MinidumpStream(minidump),
+      assertion_(),
+      expression_(),
+      function_(),
+      file_() {
+}
+
+
+MinidumpAssertion::~MinidumpAssertion() {
+}
+
+
+bool MinidumpAssertion::Read(u_int32_t expected_size) {
+  // Invalidate cached data.
+  valid_ = false;
+
+  if (expected_size != sizeof(assertion_)) {
+    BPLOG(ERROR) << "MinidumpAssertion size mismatch, " << expected_size <<
+                    " != " << sizeof(assertion_);
+    return false;
+  }
+
+  if (!minidump_->ReadBytes(&assertion_, sizeof(assertion_))) {
+    BPLOG(ERROR) << "MinidumpAssertion cannot read assertion";
+    return false;
+  }
+
+  // Each of {expression, function, file} is a UTF-16 string,
+  // we'll convert them to UTF-8 for ease of use.
+  // expression
+  // Since we don't have an explicit byte length for each string,
+  // we use UTF16codeunits to calculate word length, then derive byte
+  // length from that.
+  u_int32_t word_length = UTF16codeunits(assertion_.expression,
+                                         sizeof(assertion_.expression));
+  if (word_length > 0) {
+    u_int32_t byte_length = word_length * 2;
+    vector<u_int16_t> expression_utf16(word_length);
+    memcpy(&expression_utf16[0], &assertion_.expression[0], byte_length);
+
+    scoped_ptr<string> new_expression(UTF16ToUTF8(expression_utf16,
+                                                  minidump_->swap()));
+    expression_ = *new_expression;
+  }
+  
+  // assertion
+  word_length = UTF16codeunits(assertion_.function,
+                               sizeof(assertion_.function));
+  if (word_length) {
+    u_int32_t byte_length = word_length * 2;
+    vector<u_int16_t> function_utf16(word_length);
+    memcpy(&function_utf16[0], &assertion_.function[0], byte_length);
+    scoped_ptr<string> new_function(UTF16ToUTF8(function_utf16,
+                                                minidump_->swap()));
+    function_ = *new_function;
+  }
+
+  // file
+  word_length = UTF16codeunits(assertion_.file,
+                               sizeof(assertion_.file));
+  if (word_length > 0) {
+    u_int32_t byte_length = word_length * 2;
+    vector<u_int16_t> file_utf16(word_length);
+    memcpy(&file_utf16[0], &assertion_.file[0], byte_length);
+    scoped_ptr<string> new_file(UTF16ToUTF8(file_utf16,
+                                            minidump_->swap()));
+    file_ = *new_file;
+  }
+
+  if (minidump_->swap()) {
+    Swap(&assertion_.line);
+    Swap(&assertion_.type);
+  }
+
+  valid_ = true;
+  return true;
+}
+
+void MinidumpAssertion::Print() {
+  if (!valid_) {
+    BPLOG(ERROR) << "MinidumpAssertion cannot print invalid data";
+    return;
+  }
+
+  printf("MDAssertion\n");
+  printf("  expression                                 = %s\n",
+         expression_.c_str());
+  printf("  function                                   = %s\n",
+         function_.c_str());
+  printf("  file                                       = %s\n",
+         file_.c_str());
+  printf("  line                                       = %u\n",
+         assertion_.line);
+  printf("  type                                       = %u\n",
+         assertion_.type);
+  printf("\n");
+}
 
 //
 // MinidumpSystemInfo
@@ -3415,6 +3527,11 @@ MinidumpException* Minidump::GetException() {
   return GetStream(&exception);
 }
 
+MinidumpAssertion* Minidump::GetAssertion() {
+  MinidumpAssertion* assertion;
+  return GetStream(&assertion);
+}
+
 
 MinidumpSystemInfo* Minidump::GetSystemInfo() {
   MinidumpSystemInfo* system_info;