[wasm] Differentiate unnamed and empty names

test/mjsunit/wasm/stack.js

 // Copyright 2016 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.
 
 // clang-format off
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
@@ skipping 10 matching lines @@
           "["+i+"].getFunctionName()");
     }
     assertEquals(exp[2], frames[i].getLineNumber(), "["+i+"].getLineNumber()");
     if (exp[0])
       assertEquals(exp[3], frames[i].getPosition(),
           "["+i+"].getPosition()");
     assertContains(exp[4], frames[i].getFileName(), "["+i+"].getFileName()");
     var toString;
     if (exp[0]) {
       var funName = exp[1] == "?" ? "" : exp[1];
-      toString = funName + " (<WASM>:" + exp[2] + ":" + exp[3] + ")";
+      toString = funName + " (<WASM>[" + exp[2] + "]+" + exp[3] + ")";
     } else {
       toString = exp[4] + ":" + exp[2] + ":";
     }
     assertContains(toString, frames[i].toString(), "["+i+"].toString()");
   });
 }
 
 
 var stack;
 function STACK() {
@@ skipping 23 matching lines @@
 builder.addFunction("call_mem_out_of_bounds", kSig_v_v)
   .addBody([kExprCallFunction, kArity0, mem_oob_func.index])
   .exportAs("call_mem_out_of_bounds");
 
 var module = builder.instantiate({func: STACK});
 
 (function testSimpleStack() {
   var expected_string = "Error\n" +
     // The line numbers below will change as this test gains / loses lines..
     "    at STACK (stack.js:42:11)\n" +           // --
-    "    at main (<WASM>:0:1)\n" +                // --
+    "    at main (<WASM>[0]+1)\n" +               // --
     "    at testSimpleStack (stack.js:79:18)\n" + // --
     "    at stack.js:81:3";                       // --
 
   module.exports.main();
   assertEquals(expected_string, stripPath(stack));
 })();
 
 // For the remaining tests, collect the Callsite objects instead of just a
 // string:
 Error.prepareStackTrace = function(error, frames) {
@@ skipping 35 matching lines @@
     assertContains("out of bounds", e.message);
     verifyStack(e.stack, [
         // isWasm                  function   line  pos        file
         [    true,                      "?",     2,   3,       null],
         [    true, "call_mem_out_of_bounds",     3,   1,       null],
         [   false, "testWasmMemOutOfBounds",   118,   0, "stack.js"],
         [   false,                     null,   130,   0, "stack.js"]
     ]);
   }
 })();