PATCH (not to be comitted): Support for printing instruction statistics

runtime/vm/snapshot.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
 #include "vm/heap.h"
 #include "vm/lockers.h"
 #include "vm/longjump.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot_ids.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 #include "vm/timeline.h"
 #include "vm/version.h"
+#include "vm/code_statistics.h"
 
 // We currently only expect the Dart mutator to read snapshots.
 #define ASSERT_NO_SAFEPOINT_SCOPE()                                            \
   isolate()->AssertCurrentThreadIsMutator();                                   \
   ASSERT(thread()->no_safepoint_scope_depth() != 0)
 
 namespace dart {
 
 static const int kNumInitialReferences = 64;
 
@@ skipping 668 matching lines @@
 
 int32_t InstructionsWriter::GetObjectOffsetFor(RawObject* raw_object) {
   intptr_t heap_size = raw_object->Size();
   intptr_t offset = next_object_offset_;
   next_object_offset_ += heap_size;
   objects_.Add(ObjectData(raw_object));
   return offset;
 }
 
 
+void InstructionsWriter::DumpCombinedCodeStatistics() const {
+  CombinedCodeStatistics instruction_stats;
+  intptr_t count = instructions_.length();
+  intptr_t missing_count = 0;
+  for (intptr_t i = 0; i < count; i++) {
+    const Code &code = *instructions_[i].code_;
+    CodeStatistics* stats = code.stats();
+    if (stats != NULL) {
+      stats->AppendTo(&instruction_stats);
+    } else {
+      missing_count++;
+    }
+  }
+  instruction_stats.DumpStatistics();
+  if (missing_count > 0) {
+    fprintf(stderr, "--------------------\n");
+    fprintf(
+        stderr,
+        "Missed statistics for %" Pd " out of %" Pd " functions\n",
+        missing_count, count);
+    fprintf(stderr, "--------------------\n");
+  }
+
+  fprintf(stderr, "--------------------\n");
+  fprintf(stderr, "Emitted %" Pd " functions\n", count);
+  fprintf(stderr, "--------------------\n");
+}
+
+
 static void EnsureIdentifier(char* label) {
   for (char c = *label; c != '\0'; c = *++label) {
     if (((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')) ||
         ((c >= '0') && (c <= '9'))) {
       continue;
     }
     *label = '_';
   }
 }
 
@@ skipping 1235 matching lines @@
   if (setjmp(*jump.Set()) == 0) {
     NoSafepointScope no_safepoint;
     WriteObject(obj.raw());
   } else {
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart