[wasm] Also test structured stack trace

This extends the wasm test case which only checks the "simple"
string-variant of the stack trace.
It checks the return values of the getFunctionName, getLineNumber,
getFileName and toString methods.

R=machenbach@chromium.org, jfb@chromium.org, titzer@chromium.org

Review URL: https://codereview.chromium.org/1875153002

Cr-Commit-Position: refs/heads/master@{#35687}

test/mjsunit/mjsunit.js

@@ -114,6 +114,9 @@ var assertUnreachable;
 var assertOptimized;
 var assertUnoptimized;
 
+// Assert that a string contains another expected substring.
+var assertContains;
+
 
 (function () {  // Scope for utility functions.
 
@@ -416,6 +419,12 @@ var assertUnoptimized;
     throw new MjsUnitAssertionError(message);
   };
 
+  assertContains = function(sub, value, name_opt) {
+    if (value == null ? (sub != null) : value.indexOf(sub) == -1) {
+      fail("contains '" + String(sub) + "'", value, name_opt);
+    }
+  };
+
   var OptimizationStatusImpl = undefined;
 
   var OptimizationStatus = function(fun, sync_opt) {

test/mjsunit/mjsunit.status

@@ -283,9 +283,6 @@
   'harmony/unicode-regexp-ignore-case-noi18n': [FAIL, ['no_i18n == True', PASS]],
   # desugaring regexp property class relies on ICU.
   'harmony/regexp-property-*': [PASS, ['no_i18n == True', FAIL]],
-
-  # TODO(clemensh): Figure out why this test is failing on 'V8 Linux64 - custom snapshot - debug'
-  'wasm/stack': [PASS, FAIL],
 }],  # ALWAYS
 
 ['novfp3 == True', {

test/mjsunit/wasm/stack.js

@@ -2,39 +2,75 @@
 // 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");
 
-var expected = "Error\n" +
-    // The line numbers below will change as this test gains / loses lines..
-    "    at STACK (stack.js:24:11)\n" +     // --
-    "    at <WASM> (<anonymous>)\n" +       // TODO(jfb): wasm stack here.
-    "    at testStack (stack.js:38:18)\n" + // --
-    "    at stack.js:40:3";                 // --
-
 // The stack trace contains file path, only keep "stack.js".
 function stripPath(s) {
   return s.replace(/[^ (]*stack\.js/g, "stack.js");
 }
 
+function verifyStack(frames, expected) {
+  assertEquals(expected.length, frames.length, "number of frames mismatch");
+  expected.forEach(function(exp, i) {
+    assertEquals(exp[0], frames[i].getFunctionName(),
+        "["+i+"].getFunctionName()");
+    assertEquals(exp[1], frames[i].getLineNumber(),
+        "["+i+"].getLineNumber()");
+    assertContains(exp[2], frames[i].getFileName(),
+        "["+i+"].getFileName()");
+    assertContains(exp[3], frames[i].toString(),
+        "["+i+"].toString()");
+  });
+}
+
+
 var stack;
 function STACK() {
   var e = new Error();
   stack = e.stack;
 }
 
-(function testStack() {
-  var builder = new WasmModuleBuilder();
+var builder = new WasmModuleBuilder();
+
+builder.addImport("func", [kAstStmt]);
 
-  builder.addImport("func", [kAstStmt]);
+builder.addFunction("main", [kAstStmt])
+  .addBody([kExprCallImport, 0])
+  .exportAs("main");
 
-  builder.addFunction(undefined, [kAstStmt])
-    .addBody([kExprCallImport, 0])
-    .exportAs("main");
+var module = builder.instantiate({func: STACK});
 
-  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:33:11)\n" +           // --
+    "    at <WASM> (<anonymous>)\n" +             // TODO(jfb): wasm stack here.
+    "    at testSimpleStack (stack.js:55:18)\n" + // --
+    "    at stack.js:57:3";                       // --
+
+  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) {
+  return frames;
+};
+
+(function testStackFrames() {
   module.exports.main();
-  assertEquals(expected, stripPath(stack));
+
+  // TODO(clemensh): add a isWasm() method or similar, and test it
+  verifyStack(stack, [
+      //        function   line        file          toString
+      [          "STACK",    33, "stack.js", "stack.js:33:11"],
+      [         "<WASM>",  null,       null,         "<WASM>"],
+      ["testStackFrames",    66, "stack.js", "stack.js:66:18"],
+      [             null,    76, "stack.js",  "stack.js:76:3"]
+  ]);
 })();