[wasm] Add stack checks to loops.

src/wasm/wasm-module.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_MODULE_H_
 #define V8_WASM_MODULE_H_
 
 #include <memory>
 
 #include "src/api.h"
@@ skipping 32 matching lines @@
   kMemorySectionCode = 5,    // Memory attributes
   kGlobalSectionCode = 6,    // Global declarations
   kExportSectionCode = 7,    // Exports
   kStartSectionCode = 8,     // Start function declaration
   kElementSectionCode = 9,   // Elements section
   kCodeSectionCode = 10,     // Function code
   kDataSectionCode = 11,     // Data segments
   kNameSectionCode = 12,     // Name section (encoded as a string)
 };
 
+// Internal constants for the layout of the module object.
+enum WasmInstanceObjectFields {

[titzer, 2016/10/11 18:48:54]

Not sure why these internal fields need to be exposed now.

[ahaas, 2016/10/12 18:03:58]

I do not expose them anymore. Instead I make GetInstanceMemory in wasm-module.h
accessible. =

+  kWasmCompiledModule = 0,
+  kWasmModuleFunctionTable,
+  kWasmModuleCodeTable,
+  kWasmMemObject,
+  kWasmMemArrayBuffer,
+  kWasmGlobalsArrayBuffer,
+  kWasmDebugInfo,
+  kWasmModuleInternalFieldCount
+};
+
 inline bool IsValidSectionCode(uint8_t byte) {
   return kTypeSectionCode <= byte && byte <= kDataSectionCode;
 }
 
 const char* SectionName(WasmSectionCode code);
 
 class WasmDebugInfo;
 
 // Constants for fixed-size elements within a module.
 static const uint32_t kMaxReturnCount = 1;
@@ skipping 483 matching lines @@
                             int instance_count);
 void ValidateModuleState(Isolate* isolate, Handle<JSObject> module_obj);
 void ValidateOrphanedInstance(Isolate* isolate, Handle<JSObject> instance);
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_