Implement fromEnvironment on bool, int and String

runtime/platform/hashmap.h

 // 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.
 
 #ifndef PLATFORM_HASHMAP_H_
 #define PLATFORM_HASHMAP_H_
 
 #include "platform/globals.h"
 
 namespace dart {
 
 class HashMap {
  public:
   typedef bool (*MatchFun) (void* key1, void* key2);
 
   static bool SamePointerValue(void* key1, void* key2) {
     return key1 == key2;
   }
 
+  static uint32_t StringHash(char* key) {
+    uint32_t hash_ = 0;
+    if (key == NULL) return hash_;
+    int len = strlen(key);
+    for (int i = 0; i < len; i++) {
+      hash_ += key[i];
+      hash_ += hash_ << 10;
+      hash_ ^= hash_ >> 6;
+    }
+    hash_ += hash_ << 3;
+    hash_ ^= hash_ >> 11;
+    hash_ += hash_ << 15;
+    return hash_ == 0 ? 1 : hash_;
+  }
+
+  static bool SameStringValue(void* key1, void* key2) {
+    return strcmp(reinterpret_cast<char*>(key1),
+                  reinterpret_cast<char*>(key2)) == 0;
+  }
+
+
   // initial_capacity is the size of the initial hash map;
   // it must be a power of 2 (and thus must not be 0).
   HashMap(MatchFun match, uint32_t initial_capacity);
 
   ~HashMap();
 
   // HashMap entries are (key, value, hash) triplets.
   // Some clients may not need to use the value slot
   // (e.g. implementers of sets, where the key is the value).
   struct Entry {
@@ skipping 41 matching lines @@
   Entry* Probe(void* key, uint32_t hash);
   void Initialize(uint32_t capacity);
   void Resize();
 
   friend class IntSet;  // From hashmap_test.cc
 };
 
 }  // namespace dart
 
 #endif  // PLATFORM_HASHMAP_H_