[wasm] Improve output of PrintAstForDebugging.

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 206 matching lines @@
 typedef Result<Tree*> TreeResult;
 
 std::ostream& operator<<(std::ostream& os, const Tree& tree);
 
 TreeResult VerifyWasmCode(base::AccountingAllocator* allocator,
                           FunctionBody& body);
 TreeResult BuildTFGraph(base::AccountingAllocator* allocator,
                         TFBuilder* builder, FunctionBody& body);
 void PrintAst(base::AccountingAllocator* allocator, FunctionBody& body);
 
+// A simplified form of AST printing, e.g. from a debugger.
+void PrintAstForDebugging(const byte* start, const byte* end);
+
 inline TreeResult VerifyWasmCode(base::AccountingAllocator* allocator,
                                  ModuleEnv* module, FunctionSig* sig,
                                  const byte* start, const byte* end) {
   FunctionBody body = {module, sig, nullptr, start, end};
   return VerifyWasmCode(allocator, body);
 }
 
 inline TreeResult BuildTFGraph(base::AccountingAllocator* allocator,
                                TFBuilder* builder, ModuleEnv* module,
                                FunctionSig* sig, const byte* start,
@@ skipping 25 matching lines @@
 int OpcodeLength(const byte* pc, const byte* end);
 
 // Computes the arity (number of sub-nodes) of the opcode at the given address.
 int OpcodeArity(const byte* pc, const byte* end);
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_AST_DECODER_H_