[wasm] Identify wasm functions with index into the function tables.

src/compiler/wasm-compiler.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/compiler/wasm-compiler.h"
 
 #include <memory>
 
 #include "src/isolate-inl.h"
 
@@ skipping 3993 matching lines @@
     OFStream os(stdout);
     PrintWasmText(module_env_->module_env.module, module_env_->wire_bytes,
                   function_->func_index, os, nullptr);
   }
   if (FLAG_trace_wasm_decode_time) {
     *decode_ms = decode_timer.Elapsed().InMillisecondsF();
   }
   return source_position_table;
 }
 
+char* WasmCompilationUnit::GetTaggedFunctionName(
+    const wasm::WasmFunction* function) {
+  snprintf(function_name_, sizeof(function_name_), "wasm#%d",
+           function->func_index);
+  return function_name_;
+}
+
 WasmCompilationUnit::WasmCompilationUnit(wasm::ErrorThrower* thrower,
                                          Isolate* isolate,
                                          wasm::ModuleBytesEnv* module_env,
                                          const wasm::WasmFunction* function,
                                          uint32_t index)
     : thrower_(thrower),
       isolate_(isolate),
       module_env_(module_env),
       function_(&module_env->module_env.module->functions[index]),
       graph_zone_(new Zone(isolate->allocator(), ZONE_NAME)),
       jsgraph_(new (graph_zone()) JSGraph(
           isolate, new (graph_zone()) Graph(graph_zone()),
           new (graph_zone()) CommonOperatorBuilder(graph_zone()), nullptr,
           nullptr, new (graph_zone()) MachineOperatorBuilder(
                        graph_zone(), MachineType::PointerRepresentation(),
                        InstructionSelector::SupportedMachineOperatorFlags(),
                        InstructionSelector::AlignmentRequirements()))),
       compilation_zone_(isolate->allocator(), ZONE_NAME),
       info_(function->name_length != 0
                 ? module_env->wire_bytes.GetNameOrNull(function)
-                : ArrayVector("wasm"),
+                : CStrVector(GetTaggedFunctionName(function)),
             isolate, &compilation_zone_,
             Code::ComputeFlags(Code::WASM_FUNCTION)),
       job_(),
       index_(index),
       ok_(true),
       protected_instructions_(&compilation_zone_) {
   // Create and cache this node in the main thread.
   jsgraph_->CEntryStubConstant(1);
 }
 
@@ skipping 93 matching lines @@
                             function_->code_start_offset),
            compile_ms);
   }
 
   return code;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8