[wasm] Translate locations to positions properly

src/wasm/wasm-objects.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/wasm/wasm-objects.h"
 #include "src/wasm/wasm-module.h"
 
 #define TRACE(...)                                      \
   do {                                                  \
     if (FLAG_trace_wasm_instances) PrintF(__VA_ARGS__); \
@@ skipping 359 matching lines @@
     uint32_t func_index) {
   DCHECK_GT(module()->functions.size(), func_index);
   WasmFunction& function = module()->functions[func_index];
   SeqOneByteString* bytes = ptr_to_module_bytes();
   DCHECK_GE(static_cast<size_t>(bytes->length()), function.name_offset);
   DCHECK_GE(static_cast<size_t>(bytes->length() - function.name_offset),
             function.name_length);
   return Vector<const uint8_t>(bytes->GetCharsAddress() + function.name_offset,
                                function.name_length);
 }
+
+int WasmCompiledModule::GetFunctionOffset(uint32_t func_index) const {
+  std::vector<WasmFunction>& functions = module()->functions;
+  if (static_cast<uint32_t>(func_index) >= functions.size()) return -1;
+  DCHECK_GE(static_cast<uint32_t>(kMaxInt),
+            functions[func_index].code_start_offset);
+  return static_cast<int>(functions[func_index].code_start_offset);
+}