Safe heap pass (#1145)

Adds --safe-heap which instruments the code to check heap loads and stores for validity (null pointer derefs, within range of valid sbrk memory, and alignment). Used in SAFE_HEAP in emscripten.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/ast/import-utils.h b/src/ast/import-utils.h
new file mode 100644
index 000000000..d12c23182
--- /dev/null
+++ b/src/ast/import-utils.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017 WebAssembly Community Group participants
+ *
+ * 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.
+ */
+
+#ifndef wasm_ast_import_h
+#define wasm_ast_import_h
+
+#include "literal.h"
+#include "wasm.h"
+
+namespace wasm {
+
+namespace ImportUtils {
+  // find an import by the module.base that is being imported.
+  // return the internal name
+  inline Name getImport(Module& wasm, Name module, Name base) {
+    for (auto& import : wasm.imports) {
+      if (import->module == module && import->base == base) {
+        return import->name;
+      }
+    }
+    return Name();
+  }
+};
+
+} // namespace wasm
+
+#endif // wasm_ast_import_h
+