adjust for wasm-demo

src/wasm/ast-decoder.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_AST_DECODER_H_
 #define V8_WASM_AST_DECODER_H_
 
 #include "src/signature.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-opcodes.h"
@@ skipping 89 matching lines @@
     depth = decoder->checked_read_u8(pc, 1, "break depth");
     length = 1;
     target = nullptr;
   }
 };
 
 struct BlockCountOperand {
   uint32_t count;
   int length;
   inline BlockCountOperand(Decoder* decoder, const byte* pc) {
+    count = decoder->checked_read_u32(pc, 1, "block count");
+    length = 4;
+  }
+};
+
+struct LoopCountOperand {
+  uint32_t count;
+  int length;
+  inline LoopCountOperand(Decoder* decoder, const byte* pc) {
     count = decoder->checked_read_u8(pc, 1, "block count");
     length = 1;
   }
 };
 
 struct SignatureIndexOperand {
   uint32_t index;
   FunctionSig* sig;
   int length;
   inline SignatureIndexOperand(Decoder* decoder, const byte* pc) {
@@ skipping 144 matching lines @@
 // Computes the length of the opcode at the given address.
 int OpcodeLength(const byte* pc, const byte* end);
 
 // Computes the arity (number of sub-nodes) of the opcode at the given address.
 int OpcodeArity(FunctionEnv* env, const byte* pc, const byte* end);
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_AST_DECODER_H_