[wasm] Extra LEB utilities to leb-helper.h

src/wasm/ast-decoder.cc

 // 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.
 
 #include "src/signature.h"
 
 #include "src/bit-vector.h"
 #include "src/flags.h"
 #include "src/handles.h"
 #include "src/zone-containers.h"
@@ skipping 1656 matching lines @@
   PrintF("%s", WasmOpcodes::OpcodeName(tree.opcode()));
   if (tree.count > 0) os << "(";
   for (uint32_t i = 0; i < tree.count; i++) {
     if (i > 0) os << ", ";
     os << *tree.children[i];
   }
   if (tree.count > 0) os << ")";
   return os;
 }
 
-
-ReadUnsignedLEB128ErrorCode ReadUnsignedLEB128Operand(const byte* pc,
-                                                      const byte* limit,
-                                                      int* length,
-                                                      uint32_t* result) {
-  Decoder decoder(pc, limit);
-  *result = decoder.checked_read_u32v(pc, 0, length);
-  if (decoder.ok()) return kNoError;
-  return (limit - pc) > 1 ? kInvalidLEB128 : kMissingLEB128;
-}
-
 int OpcodeLength(const byte* pc, const byte* end) {
   WasmDecoder decoder(nullptr, nullptr, pc, end);
   return decoder.OpcodeLength(pc);
 }
 
 int OpcodeArity(ModuleEnv* module, FunctionSig* sig, const byte* pc,
                 const byte* end) {
   WasmDecoder decoder(module, sig, pc, end);
   return decoder.OpcodeArity(pc);
 }
@@ skipping 89 matching lines @@
 BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals,
                                            const byte* start, const byte* end) {
   FunctionBody body = {nullptr, nullptr, nullptr, start, end};
   SR_WasmDecoder decoder(zone, nullptr, body);
   return decoder.AnalyzeLoopAssignmentForTesting(start, num_locals);
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8