[wasm] Enforce limits for maximums for many WebAssembly binary entities.

src/wasm/wasm-limits.h

 // Copyright 2016 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_WASM_LIMITS_H_
 #define V8_WASM_WASM_LIMITS_H_
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
-const size_t kV8MaxWasmSignatures = 10000000;
-const size_t kV8MaxWasmFunctions = 10000000;
+const size_t kV8MaxWasmTypes = 1000000;

[ahaas, 2016/12/14 12:44:14]

Can you add a comment that these number are just picked arbitrarily (are they?)?

[titzer, 2016/12/14 17:19:54]

Done.

+const size_t kV8MaxWasmFunctions = 1000000;
+const size_t kV8MaxWasmImports = 100000;
+const size_t kV8MaxWasmGlobals = 1000000;
+const size_t kV8MaxWasmDataSegments = 100000;
 const size_t kV8MaxWasmMemoryPages = 16384;  // = 1 GiB
 const size_t kV8MaxWasmStringSize = 256;
 const size_t kV8MaxWasmModuleSize = 1024 * 1024 * 1024;  // = 1 GiB
 const size_t kV8MaxWasmFunctionSize = 128 * 1024;
 const size_t kV8MaxWasmFunctionLocals = 50000;
+const size_t kV8MaxWasmFunctionParamCount = 1000;
+const size_t kV8MaxWasmFunctionMultiReturnCount = 1000;
+const size_t kV8MaxWasmFunctionReturnCount = 1;
 const size_t kV8MaxWasmTableSize = 16 * 1024 * 1024;
 
 const size_t kSpecMaxWasmMemoryPages = 65536;
 
 const uint64_t kWasmMaxHeapOffset =
     static_cast<uint64_t>(
         std::numeric_limits<uint32_t>::max())  // maximum base value
     + std::numeric_limits<uint32_t>::max();    // maximum index value
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_WASM_LIMITS_H_