Implement a heap profiler for the Dart managed heap.

runtime/vm/unicode.cc

 // Copyright (c) 2011, 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/unicode.h"
 
 #include "vm/allocation.h"
 #include "vm/globals.h"
 #include "vm/object.h"
 
@@ skipping 109 matching lines @@
 intptr_t Utf8::Length(const String& str) {
   intptr_t length = 0;
   for (intptr_t i = 0; i < str.Length(); ++i) {
     int32_t ch = str.CharAt(i);
     length += Utf8::Length(ch);
   }
   return length;
 }
 
 
-void Utf8::Encode(int32_t ch, char* dst) {
+intptr_t Utf8::Encode(int32_t ch, char* dst) {
   static const int kMask = ~(1 << 6);
   if (ch <= kMaxOneByteChar) {
     dst[0] = ch;
-  } else if (ch <= kMaxTwoByteChar) {
+    return 1;
+  }
+  if (ch <= kMaxTwoByteChar) {
     dst[0] = 0xC0 | (ch >> 6);
     dst[1] = 0x80 | (ch & kMask);
-  } else if (ch <= kMaxThreeByteChar) {
+    return 2;
+  }
+  if (ch <= kMaxThreeByteChar) {
     dst[0] = 0xE0 | (ch >> 12);
     dst[1] = 0x80 | ((ch >> 6) & kMask);
     dst[2] = 0x80 | (ch & kMask);
-  } else {
-    ASSERT(ch <= kMaxFourByteChar);
-    dst[0] = 0xF0 | (ch >> 18);
-    dst[1] = 0x80 | ((ch >> 12) & kMask);
-    dst[2] = 0x80 | ((ch >> 6) & kMask);
-    dst[3] = 0x80 | (ch & kMask);
+    return 3;
   }
+  ASSERT(ch <= kMaxFourByteChar);
+  dst[0] = 0xF0 | (ch >> 18);
+  dst[1] = 0x80 | ((ch >> 12) & kMask);
+  dst[2] = 0x80 | ((ch >> 6) & kMask);
+  dst[3] = 0x80 | (ch & kMask);
+  return 4;
 }
 
 
 intptr_t Utf8::Encode(const String& src, char* dst, intptr_t len) {
   intptr_t pos = 0;
   for (intptr_t i = 0; i < src.Length(); ++i) {
     intptr_t ch = src.CharAt(i);
     intptr_t num_bytes = Utf8::Length(ch);
     if (pos + num_bytes > len) {
       break;
@@ skipping 64 matching lines @@
 bool Utf8::Decode(const char* src, uint16_t* dst, intptr_t len) {
   return DecodeImpl(src, dst, len);
 }
 
 
 bool Utf8::Decode(const char* src, uint32_t* dst, intptr_t len) {
   return DecodeImpl(src, dst, len);
 }
 
 }  // namespace dart