[wasm] Fix location for error in asm.js ToNumber conversion

test/mjsunit/wasm/asm-wasm-exception-in-tonumber.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.
+
+// Flags: --validate-asm
+
+var filename = '(?:[^ ]+/)?test/mjsunit/wasm/asm-wasm-exception-in-tonumber.js';
+filename = filename.replace(/\//g, '[/\\\\]');
+
+function verifyStack(frames, expected) {
+  assertTrue(frames.length >= expected.length, 'too few frames');
+  print('frames on detailed stack (' + frames.length + '):');
+  frames.forEach((fr, i) => print('[' + i + '] ' + fr));
+  expected.forEach(function(exp, i) {
+    assertEquals(
+        exp[0], frames[i].getFunctionName(), '[' + i + '].getFunctionName()');
+    assertEquals(
+        exp[1], frames[i].getLineNumber(), '[' + i + '].getLineNumber()');
+    assertEquals(
+        exp[2], frames[i].getColumnNumber(), '[' + i + '].getColumnNumber()');
+    assertContains(
+        ':' + exp[1] + ':' + exp[2], frames[i].toString(),
+        '[' + i + '].toString()');
+  });
+}
+
+function verifyPreformattedStack(e, expected_lines) {
+  print('preformatted stack: ' + e.stack);
+  var lines = e.stack.split('\n');
+  assertTrue(lines.length >= expected_lines.length, 'too few lines');
+  for (var i = 0; i < expected_lines.length; ++i) {
+    assertMatches(expected_lines[i], lines[i], 'line ' + i);
+  }
+}
+
+function sym(return_sym) {
+  if (return_sym) return Symbol();
+  throw Error("user-thrown");
+}
+
+function generateAsmJs(stdlib, foreign) {
+  'use asm';
+  var sym = foreign.sym;
+  function callSym(i) {
+    i=i|0;
+    return sym(i|0) | 0;
+  }
+  return callSym;
+}
+
+function testHelper(use_asm_js, check_detailed, expected, input) {
+  if (check_detailed) {
+    Error.prepareStackTrace = (error, frames) => frames;
+  } else {
+    delete Error.prepareStackTrace;
+  }
+
+  var fn_code = '(' + generateAsmJs.toString() + ')({}, {sym: sym})';
+  if (!use_asm_js) fn_code = fn_code.replace('use asm', '');
+  //print('executing:\n' + fn_code);
+  var asm_js_fn = eval(fn_code);
+  try {
+    asm_js_fn(input);
+  } catch (e) {
+    if (check_detailed) {
+      verifyStack(e.stack, expected);
+    } else {
+      verifyPreformattedStack(e, expected);
+    }
+  }
+}
+
+function testAll(expected_stack, expected_frames, input) {
+  for (use_asm_js = 0; use_asm_js <= 1; ++use_asm_js) {
+    for (test_detailed = 0; test_detailed <= 1; ++test_detailed) {
+      print('\nConfig: asm ' + use_asm_js + '; detailed ' + test_detailed);
+      testHelper(
+          use_asm_js, test_detailed,
+          test_detailed ? expected_frames : expected_stack, input);
+    }
+  }
+}
+
+(function testStackForThrowAtCall() {
+  var expected_stack = [
+    '^Error: user-thrown$',
+    '^ *at sym \\(' + filename + ':41:9\\)$',

[bradnelson, 2016/12/07 19:19:06]

Might be worth being less picky about the row to be less brittle?

[Clemens Hammacher, 2016/12/08 10:50:23]

Yep, removed all line number information.

+    '^ *at callSym \\(.*<anonymous>:6:12\\)$',
+  ];
+  var expected_frames = [
+      //  function   line  pos
+      [      "sym",    41,   9],
+      [  "callSym",     6,  12],
+  ];
+
+  testAll(expected_stack, expected_frames, 0);
+})();
+
+(function testStackForThrowAtConversion() {
+  var expected_stack = [
+    '^TypeError: Cannot convert a Symbol value to a number$',
+    '^ *at callSym \\(.*<anonymous>:6:21\\)$',
+  ];
+  var expected_frames = [
+      //  function   line  pos
+      [  "callSym",     6,  21],
+  ];
+
+  testAll(expected_stack, expected_frames, 1);
+})();