1 files changed, 77 insertions, 0 deletions
diff --git a/ninja/src/depfile_parser_perftest.cc b/ninja/src/depfile_parser_perftest.cc
new file mode 100644
index 00000000000..b21522168df
--- /dev/null
+++ b/ninja/src/depfile_parser_perftest.cc
@@ -0,0 +1,77 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "depfile_parser.h"
+#include "util.h"
+#include "metrics.h"
+
+int main(int argc, char* argv[]) {
+  if (argc < 2) {
+    printf("usage: %s <file1> <file2...>\n", argv[0]);
+    return 1;
+  }
+
+  vector<float> times;
+  for (int i = 1; i < argc; ++i) {
+    const char* filename = argv[i];
+
+    for (int limit = 1 << 10; limit < (1<<20); limit *= 2) {
+      int64_t start = GetTimeMillis();
+      for (int rep = 0; rep < limit; ++rep) {
+        string buf;
+        string err;
+        if (ReadFile(filename, &buf, &err) < 0) {
+          printf("%s: %s\n", filename, err.c_str());
+          return 1;
+        }
+
+        DepfileParser parser;
+        if (!parser.Parse(&buf, &err)) {
+          printf("%s: %s\n", filename, err.c_str());
+          return 1;
+        }
+      }
+      int64_t end = GetTimeMillis();
+
+      if (end - start > 100) {
+        int delta = (int)(end - start);
+        float time = delta*1000 / (float)limit;
+        printf("%s: %.1fus\n", filename, time);
+        times.push_back(time);
+        break;
+      }
+    }
+  }
+
+  if (!times.empty()) {
+    float min = times[0];
+    float max = times[0];
+    float total = 0;
+    for (size_t i = 0; i < times.size(); ++i) {
+      total += times[i];
+      if (times[i] < min)
+        min = times[i];
+      else if (times[i] > max)
+        max = times[i];
+    }
+
+    printf("min %.1fus  max %.1fus  avg %.1fus\n",
+           min, max, total / times.size());
+  }
+
+  return 0;
+}