pkg/sourcemap_testing/lib/src/stacktrace_helper.dart - sdk.git - Git at Google

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 import 'dart:async';
 import 'dart:io';
 import 'dart:convert' show jsonDecode;

 import 'package:_fe_analyzer_shared/src/testing/annotated_code_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:source_maps/source_maps.dart';
 import 'package:source_maps/src/utils.dart';
 import 'package:source_span/source_span.dart';
 import 'package:dart2js_tools/src/dart2js_mapping.dart';

 const String INPUT_FILE_NAME = 'input.dart';

 class Test {
   final String code;
   final Map<String, Expectations> expectationMap;

   Test(this.code, this.expectationMap);
 }

 class Expectations {
   final List<StackTraceLine> expectedLines;
   final List<StackTraceLine> unexpectedLines;

   Expectations(this.expectedLines, this.unexpectedLines);
 }

 /// Convert the annotated [code] to a [Test] object using [configs] to split
 /// the annotations by prefix.
 Test processTestCode(String code, Iterable<String> configs) {
   AnnotatedCode annotatedCode =
       new AnnotatedCode.fromText(code, commentStart, commentEnd);

   Map<String, Expectations> expectationMap = <String, Expectations>{};

   splitByPrefixes(annotatedCode, configs)
       .forEach((String config, AnnotatedCode annotatedCode) {
     Map<int, StackTraceLine> stackTraceMap = <int, StackTraceLine>{};
     List<StackTraceLine> unexpectedLines = <StackTraceLine>[];

     for (Annotation annotation in annotatedCode.annotations) {
       String text = annotation.text;
       int colonIndex = text.indexOf(':');
       String indexText = text.substring(0, colonIndex);
       String methodName = text.substring(colonIndex + 1);
       StackTraceLine stackTraceLine = new StackTraceLine(
           methodName, INPUT_FILE_NAME, annotation.lineNo, annotation.columnNo);
       if (indexText == '') {
         unexpectedLines.add(stackTraceLine);
       } else {
         int stackTraceIndex = int.parse(indexText);
         assert(!stackTraceMap.containsKey(stackTraceIndex));
         stackTraceMap[stackTraceIndex] = stackTraceLine;
       }
     }

     List<StackTraceLine> expectedLines = <StackTraceLine>[];
     for (int stackTraceIndex
         in (stackTraceMap.keys.toList()..sort()).reversed) {
       expectedLines.add(stackTraceMap[stackTraceIndex]);
     }
     expectationMap[config] = new Expectations(expectedLines, unexpectedLines);
   });

   return new Test(annotatedCode.sourceCode, expectationMap);
 }

 /// Compile function used in [testStackTrace]. [input] is the name of the input
 /// Dart file and [output] is the name of the generated JavaScript file. The
 /// function returns `true` if the compilation succeeded.
 typedef Future<bool> CompileFunc(String input, String output);

 List<String> emptyPreamble(input, output) => const <String>[];
 String identityConverter(String name) => name;

 /// Tests the stack trace of [test] using the expectations for [config].
 ///
 /// The [compile] function is called to compile the Dart code in [test] to
 /// JavaScript.
 ///
 /// The [jsPreambles] contains the path of additional JavaScript files needed
 /// to run the generated JavaScript file.
 ///
 /// The [beforeExceptions] lines are allowed before the intended stack trace.
 /// The [afterExceptions] lines are allowed after the intended stack trace.
 ///
 /// If [printJs] is `true`, the generated JavaScript code is print to the
 /// console. If [writeJs] is `true` the generated JavaScript code and the
 /// generated source map are saved in the current working directory (as 'out.js'
 /// and 'out.js.map', respectively).
 ///
 /// If forcedTmpDir is given that directory is used as the out directory and
 /// will not be cleaned up. Note that if *not* giving a temporary directory and
 /// the test fails the directory will not be cleaned up.
 Future testStackTrace(Test test, String config, CompileFunc compile,
     {bool printJs: false,
     bool writeJs: false,
     bool verbose: false,
     List<String> Function(String input, String output) jsPreambles:
         emptyPreamble,
     List<LineException> beforeExceptions: const <LineException>[],
     List<LineException> afterExceptions: const <LineException>[],
     bool useJsMethodNamesOnAbsence: false,
     String Function(String name) jsNameConverter: identityConverter,
     Directory forcedTmpDir: null,
     int stackTraceLimit: 10,
     expandDart2jsInliningData: false}) async {
   Expect.isTrue(test.expectationMap.keys.contains(config),
       "No expectations found for '$config' in ${test.expectationMap.keys}");

   Directory tmpDir =
       forcedTmpDir ?? await Directory.systemTemp.createTemp('stacktrace-test');
   String input = '${tmpDir.path}/$INPUT_FILE_NAME';
   new File(input).writeAsStringSync(test.code);
   String output = '${tmpDir.path}/out.js';

   Expect.isTrue(await compile(input, output),
       "Unsuccessful compilation of test:\n${test.code}");
   File sourceMapFile = new File('$output.map');
   Expect.isTrue(
       sourceMapFile.existsSync(), "Source map not generated for $input");
   String sourceMapText = sourceMapFile.readAsStringSync();
   SingleMapping sourceMap = parse(sourceMapText);
   String jsOutput = new File(output).readAsStringSync();

   if (printJs) {
     print('JavaScript output:');
     print(jsOutput);
   }
   if (writeJs) {
     new File('out.js').writeAsStringSync(jsOutput);
     new File('out.js.map').writeAsStringSync(sourceMapText);
   }
   print("Running d8 $output");
   List<String> d8Arguments = <String>[];
   d8Arguments.add('--stack-trace-limit');
   d8Arguments.add('$stackTraceLimit');
   d8Arguments.addAll(jsPreambles(input, output));
   d8Arguments.add(output);
   ProcessResult runResult = Process.runSync(d8executable, d8Arguments);
   String out = '${runResult.stderr}\n${runResult.stdout}';
   if (verbose) {
     print('d8 output:');
     print(out);
   }
   List<String> lines = out.split(new RegExp(r'(\r|\n|\r\n)'));
   List<StackTraceLine> jsStackTrace = <StackTraceLine>[];
   for (String line in lines) {
     if (line.startsWith('    at ')) {
       StackTraceLine stackTraceLine = new StackTraceLine.fromText(line);
       if (stackTraceLine.lineNo != null && stackTraceLine.columnNo != null) {
         jsStackTrace.add(stackTraceLine);
       }
     }
   }

   List<StackTraceLine> dartStackTrace = <StackTraceLine>[];
   for (StackTraceLine line in jsStackTrace) {
     TargetEntry targetEntry = _findColumn(
         line.lineNo - 1, line.columnNo - 1, _findLine(sourceMap, line));
     if (targetEntry == null || targetEntry.sourceUrlId == null) {
       dartStackTrace.add(line);
     } else {
       String fileName;
       if (targetEntry.sourceUrlId != null) {
         fileName = sourceMap.urls[targetEntry.sourceUrlId];
       }
       int targetLine = targetEntry.sourceLine + 1;
       int targetColumn = targetEntry.sourceColumn + 1;

       if (expandDart2jsInliningData) {
         SourceFile file = new SourceFile.fromString(jsOutput);
         int offset = file.getOffset(line.lineNo - 1, line.columnNo - 1);
         Map<int, List<FrameEntry>> frames =
             _loadInlinedFrameData(sourceMap, sourceMapText);
         List<int> indices = frames.keys.toList()..sort();
         int key = binarySearch(indices, (i) => i > offset) - 1;
         int depth = 0;
         outer:
         while (key >= 0) {
           for (var frame in frames[indices[key]].reversed) {
             if (frame.isEmpty) break outer;
             if (frame.isPush) {
               if (depth <= 0) {
                 dartStackTrace.add(new StackTraceLine(
                     frame.inlinedMethodName + "(inlined)",
                     fileName,
                     targetLine,
                     targetColumn,
                     isMapped: true));
                 fileName = frame.callUri;
                 targetLine = frame.callLine + 1;
                 targetColumn = frame.callColumn + 1;
               } else {
                 depth--;
               }
             }
             if (frame.isPop) {
               depth++;
             }
           }
           key--;
         }
         targetEntry = findEnclosingFunction(jsOutput, file, offset, sourceMap);
       }

       String methodName;
       if (targetEntry.sourceNameId != null) {
         methodName = sourceMap.names[targetEntry.sourceNameId];
       } else if (useJsMethodNamesOnAbsence) {
         methodName = jsNameConverter(line.methodName);
       }

       dartStackTrace.add(new StackTraceLine(
           methodName, fileName, targetLine, targetColumn,
           isMapped: true));
     }
   }

   Expectations expectations = test.expectationMap[config];

   int expectedIndex = 0;
   List<StackTraceLine> unexpectedLines = <StackTraceLine>[];
   List<StackTraceLine> unexpectedBeforeLines = <StackTraceLine>[];
   List<StackTraceLine> unexpectedAfterLines = <StackTraceLine>[];
   for (StackTraceLine line in dartStackTrace) {
     bool found = false;
     if (expectedIndex < expectations.expectedLines.length) {
       StackTraceLine expectedLine = expectations.expectedLines[expectedIndex];
       if (line.methodName == expectedLine.methodName &&
           line.lineNo == expectedLine.lineNo &&
           line.columnNo == expectedLine.columnNo) {
         found = true;
         expectedIndex++;
       }
     }
     for (StackTraceLine unexpectedLine in expectations.unexpectedLines) {
       if (line.methodName == unexpectedLine.methodName &&
           line.lineNo == unexpectedLine.lineNo &&
           line.columnNo == unexpectedLine.columnNo) {
         unexpectedLines.add(line);
       }
     }
     if (line.isMapped && !found) {
       List<LineException> exceptions =
           expectedIndex == 0 ? beforeExceptions : afterExceptions;
       for (LineException exception in exceptions) {
         String fileName = exception.fileName;
         if (line.methodName == exception.methodName &&
             line.fileName.endsWith(fileName)) {
           found = true;
         }
       }
       if (!found) {
         if (expectedIndex == 0) {
           unexpectedBeforeLines.add(line);
         } else {
           unexpectedAfterLines.add(line);
         }
       }
     }
   }
   if (verbose) {
     print('JavaScript stacktrace:');
     print(jsStackTrace.join('\n'));
     print('\nDart stacktrace:');
     print(dartStackTrace.join('\n'));
   }
   Expect.equals(
       expectedIndex,
       expectations.expectedLines.length,
       "Missing stack trace lines for test:\n${test.code}\n"
       "Actual:\n${dartStackTrace.join('\n')}\n\n"
       "Expected:\n${expectations.expectedLines.join('\n')}\n");
   Expect.isTrue(
       unexpectedLines.isEmpty,
       "Unexpected stack trace lines for test:\n${test.code}\n"
       "Actual:\n${dartStackTrace.join('\n')}\n\n"
       "Unexpected:\n${expectations.unexpectedLines.join('\n')}\n");
   Expect.isTrue(
       unexpectedBeforeLines.isEmpty && unexpectedAfterLines.isEmpty,
       "Unexpected stack trace lines:\n${test.code}\n"
       "Actual:\n${dartStackTrace.join('\n')}\n\n"
       "Unexpected before:\n${unexpectedBeforeLines.join('\n')}\n\n"
       "Unexpected after:\n${unexpectedAfterLines.join('\n')}\n");

   if (forcedTmpDir == null) {
     print("Deleting '${tmpDir.path}'.");
     tmpDir.deleteSync(recursive: true);
   }
 }

 class StackTraceLine {
   String methodName;
   String fileName;
   int lineNo;
   int columnNo;
   bool isMapped;

   StackTraceLine(this.methodName, this.fileName, this.lineNo, this.columnNo,
       {this.isMapped: false});

   /// Creates a [StackTraceLine] by parsing a d8 stack trace line [text]. The
   /// expected formats are
   ///
   ///     at <methodName>(<fileName>:<lineNo>:<columnNo>)
   ///     at <methodName>(<fileName>:<lineNo>)
   ///     at <methodName>(<fileName>)
   ///     at <fileName>:<lineNo>:<columnNo>
   ///     at <fileName>:<lineNo>
   ///     at <fileName>
   ///
   factory StackTraceLine.fromText(String text) {
     text = text.trim();
     assert(text.startsWith('at '));
     text = text.substring('at '.length);
     String methodName;
     if (text.endsWith(')')) {
       int nameEnd = text.indexOf(' (');
       methodName = text.substring(0, nameEnd);
       text = text.substring(nameEnd + 2, text.length - 1);
     }
     int lineNo;
     int columnNo;
     String fileName;
     int lastColon = text.lastIndexOf(':');
     if (lastColon != -1) {
       int lastValue = int.tryParse(text.substring(lastColon + 1));
       if (lastValue != null) {
         int secondToLastColon = text.lastIndexOf(':', lastColon - 1);
         if (secondToLastColon != -1) {
           int secondToLastValue =
               int.tryParse(text.substring(secondToLastColon + 1, lastColon));
           if (secondToLastValue != null) {
             lineNo = secondToLastValue;
             columnNo = lastValue;
             fileName = text.substring(0, secondToLastColon);
           } else {
             lineNo = lastValue;
             fileName = text.substring(0, lastColon);
           }
         } else {
           lineNo = lastValue;
           fileName = text.substring(0, lastColon);
         }
       } else {
         fileName = text;
       }
     } else {
       fileName = text;
     }
     return new StackTraceLine(methodName, fileName, lineNo, columnNo);
   }

   String toString() {
     StringBuffer sb = new StringBuffer();
     sb.write('  at ');
     if (methodName != null) {
       sb.write(methodName);
       sb.write(' (');
       sb.write(fileName ?? '?');
       sb.write(':');
       sb.write(lineNo);
       sb.write(':');
       sb.write(columnNo);
       sb.write(')');
     } else {
       sb.write(fileName ?? '?');
       sb.write(':');
       sb.write(lineNo);
       sb.write(':');
       sb.write(columnNo);
     }
     return sb.toString();
   }
 }

 /// Returns [TargetLineEntry] which includes the location in the target [line]
 /// number. In particular, the resulting entry is the last entry whose line
 /// number is lower or equal to [line].
 ///
 /// Copied from [SingleMapping._findLine].
 TargetLineEntry _findLine(SingleMapping sourceMap, StackTraceLine stLine) {
   String filename = stLine.fileName
       .substring(stLine.fileName.lastIndexOf(new RegExp("[\\\/]")) + 1);
   if (sourceMap.targetUrl != filename) return null;
   return _findLineInternal(sourceMap, stLine.lineNo - 1);
 }

 TargetLineEntry _findLineInternal(SingleMapping sourceMap, int line) {
   int index = binarySearch(sourceMap.lines, (e) => e.line > line);
   return (index <= 0) ? null : sourceMap.lines[index - 1];
 }

 /// Returns [TargetEntry] which includes the location denoted by
 /// [line], [column]. If [lineEntry] corresponds to [line], then this will be
 /// the last entry whose column is lower or equal than [column]. If
 /// [lineEntry] corresponds to a line prior to [line], then the result will be
 /// the very last entry on that line.
 ///
 /// Copied from [SingleMapping._findColumn].
 TargetEntry _findColumn(int line, int column, TargetLineEntry lineEntry) {
   if (lineEntry == null || lineEntry.entries.length == 0) return null;
   if (lineEntry.line != line) return lineEntry.entries.last;
   var entries = lineEntry.entries;
   int index = binarySearch(entries, (e) => e.column > column);
   return (index <= 0) ? null : entries[index - 1];
 }

 /// Returns the path of the d8 executable.
 String get d8executable {
   if (Platform.isWindows) {
     return 'third_party/d8/windows/d8.exe';
   } else if (Platform.isLinux) {
     return 'third_party/d8/linux/d8';
   } else if (Platform.isMacOS) {
     return 'third_party/d8/macos/d8';
   }
   throw new UnsupportedError('Unsupported platform.');
 }

 /// A line allowed in the mapped stack trace.
 class LineException {
   final String methodName;
   final String fileName;

   const LineException(this.methodName, this.fileName);
 }

 /// Search backwards in [sources] for a function declaration that includes the
 /// [start] offset.
 TargetEntry findEnclosingFunction(
     String sources, SourceFile file, int start, SingleMapping mapping) {
   if (sources == null) return null;
   var index = start;
   while (true) {
     index = nextDeclarationCandidate(sources, index);
     if (index < 0) return null;
     var line = file.getLine(index);
     var lineEntry = _findLineInternal(mapping, line);
     var result = _findColumn(line, file.getColumn(index), lineEntry);
     if (result?.column == file.getColumn(index)) return result;
     index--;
   }
 }

 /// Returns the index of a candidate location of a enclosing function
 /// declaration. We try to find the beginning of a `function` keyword or the
 /// `(` of an ES6 method definition, but the search contains some false
 /// positives. To rule out false positives, [findEnclosingFunction]
 /// validates that the returned location contains a source-map entry, searching
 /// for another candidate if not.
 int nextDeclarationCandidate(String sources, int start) {
   var indexForFunctionKeyword = sources.lastIndexOf('function', start);
   // We attempt to identify potential method definitions by looking for any '('
   // that precedes a '{'. This method will fail if 1) Dart2JS starts emitting
   // functions with initializers or 2) sourcemap boundaries appear at '(' for
   // non-method-definition constructs.
   var indexForMethodDefinition = sources.lastIndexOf('{', start);
   if (indexForFunctionKeyword > indexForMethodDefinition ||
       indexForFunctionKeyword < 0) {
     return indexForFunctionKeyword;
   }
   indexForMethodDefinition = sources.lastIndexOf('(', indexForMethodDefinition);
   return indexForFunctionKeyword > indexForMethodDefinition
       ? indexForFunctionKeyword
       : indexForMethodDefinition;
 }

 Map<int, List<FrameEntry>> _loadInlinedFrameData(
     SingleMapping mapping, String sourceMapText) {
   var json = jsonDecode(sourceMapText);
   return Dart2jsMapping(mapping, json).frames;
 }
	// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	import 'dart:async';
	import 'dart:io';
	import 'dart:convert' show jsonDecode;

	import 'package:_fe_analyzer_shared/src/testing/annotated_code_helper.dart';
	import 'package:expect/expect.dart';
	import 'package:source_maps/source_maps.dart';
	import 'package:source_maps/src/utils.dart';
	import 'package:source_span/source_span.dart';
	import 'package:dart2js_tools/src/dart2js_mapping.dart';

	const String INPUT_FILE_NAME = 'input.dart';

	class Test {
	final String code;
	final Map<String, Expectations> expectationMap;

	Test(this.code, this.expectationMap);
	}

	class Expectations {
	final List<StackTraceLine> expectedLines;
	final List<StackTraceLine> unexpectedLines;

	Expectations(this.expectedLines, this.unexpectedLines);
	}

	/// Convert the annotated [code] to a [Test] object using [configs] to split
	/// the annotations by prefix.
	Test processTestCode(String code, Iterable<String> configs) {
	AnnotatedCode annotatedCode =
	new AnnotatedCode.fromText(code, commentStart, commentEnd);

	Map<String, Expectations> expectationMap = <String, Expectations>{};

	splitByPrefixes(annotatedCode, configs)
	.forEach((String config, AnnotatedCode annotatedCode) {
	Map<int, StackTraceLine> stackTraceMap = <int, StackTraceLine>{};
	List<StackTraceLine> unexpectedLines = <StackTraceLine>[];

	for (Annotation annotation in annotatedCode.annotations) {
	String text = annotation.text;
	int colonIndex = text.indexOf(':');
	String indexText = text.substring(0, colonIndex);
	String methodName = text.substring(colonIndex + 1);
	StackTraceLine stackTraceLine = new StackTraceLine(
	methodName, INPUT_FILE_NAME, annotation.lineNo, annotation.columnNo);
	if (indexText == '') {
	unexpectedLines.add(stackTraceLine);
	} else {
	int stackTraceIndex = int.parse(indexText);
	assert(!stackTraceMap.containsKey(stackTraceIndex));
	stackTraceMap[stackTraceIndex] = stackTraceLine;
	}
	}

	List<StackTraceLine> expectedLines = <StackTraceLine>[];
	for (int stackTraceIndex
	in (stackTraceMap.keys.toList()..sort()).reversed) {
	expectedLines.add(stackTraceMap[stackTraceIndex]);
	}
	expectationMap[config] = new Expectations(expectedLines, unexpectedLines);
	});

	return new Test(annotatedCode.sourceCode, expectationMap);
	}

	/// Compile function used in [testStackTrace]. [input] is the name of the input
	/// Dart file and [output] is the name of the generated JavaScript file. The
	/// function returns `true` if the compilation succeeded.
	typedef Future<bool> CompileFunc(String input, String output);

	List<String> emptyPreamble(input, output) => const <String>[];
	String identityConverter(String name) => name;

	/// Tests the stack trace of [test] using the expectations for [config].
	///
	/// The [compile] function is called to compile the Dart code in [test] to
	/// JavaScript.
	///
	/// The [jsPreambles] contains the path of additional JavaScript files needed
	/// to run the generated JavaScript file.
	///
	/// The [beforeExceptions] lines are allowed before the intended stack trace.
	/// The [afterExceptions] lines are allowed after the intended stack trace.
	///
	/// If [printJs] is `true`, the generated JavaScript code is print to the
	/// console. If [writeJs] is `true` the generated JavaScript code and the
	/// generated source map are saved in the current working directory (as 'out.js'
	/// and 'out.js.map', respectively).
	///
	/// If forcedTmpDir is given that directory is used as the out directory and
	/// will not be cleaned up. Note that if not giving a temporary directory and
	/// the test fails the directory will not be cleaned up.
	Future testStackTrace(Test test, String config, CompileFunc compile,
	{bool printJs: false,
	bool writeJs: false,
	bool verbose: false,
	List<String> Function(String input, String output) jsPreambles:
	emptyPreamble,
	List<LineException> beforeExceptions: const <LineException>[],
	List<LineException> afterExceptions: const <LineException>[],
	bool useJsMethodNamesOnAbsence: false,
	String Function(String name) jsNameConverter: identityConverter,
	Directory forcedTmpDir: null,
	int stackTraceLimit: 10,
	expandDart2jsInliningData: false}) async {
	Expect.isTrue(test.expectationMap.keys.contains(config),
	"No expectations found for '$config' in ${test.expectationMap.keys}");

	Directory tmpDir =
	forcedTmpDir ?? await Directory.systemTemp.createTemp('stacktrace-test');
	String input = '${tmpDir.path}/$INPUT_FILE_NAME';
	new File(input).writeAsStringSync(test.code);
	String output = '${tmpDir.path}/out.js';

	Expect.isTrue(await compile(input, output),
	"Unsuccessful compilation of test:\n${test.code}");
	File sourceMapFile = new File('$output.map');
	Expect.isTrue(
	sourceMapFile.existsSync(), "Source map not generated for $input");
	String sourceMapText = sourceMapFile.readAsStringSync();
	SingleMapping sourceMap = parse(sourceMapText);
	String jsOutput = new File(output).readAsStringSync();

	if (printJs) {
	print('JavaScript output:');
	print(jsOutput);
	}
	if (writeJs) {
	new File('out.js').writeAsStringSync(jsOutput);
	new File('out.js.map').writeAsStringSync(sourceMapText);
	}
	print("Running d8 $output");
	List<String> d8Arguments = <String>[];
	d8Arguments.add('--stack-trace-limit');
	d8Arguments.add('$stackTraceLimit');
	d8Arguments.addAll(jsPreambles(input, output));
	d8Arguments.add(output);
	ProcessResult runResult = Process.runSync(d8executable, d8Arguments);
	String out = '${runResult.stderr}\n${runResult.stdout}';
	if (verbose) {
	print('d8 output:');
	print(out);
	}
	List<String> lines = out.split(new RegExp(r'(\r\|\n\|\r\n)'));
	List<StackTraceLine> jsStackTrace = <StackTraceLine>[];
	for (String line in lines) {
	if (line.startsWith(' at ')) {
	StackTraceLine stackTraceLine = new StackTraceLine.fromText(line);
	if (stackTraceLine.lineNo != null && stackTraceLine.columnNo != null) {
	jsStackTrace.add(stackTraceLine);
	}
	}
	}

	List<StackTraceLine> dartStackTrace = <StackTraceLine>[];
	for (StackTraceLine line in jsStackTrace) {
	TargetEntry targetEntry = _findColumn(
	line.lineNo - 1, line.columnNo - 1, _findLine(sourceMap, line));
	if (targetEntry == null \|\| targetEntry.sourceUrlId == null) {
	dartStackTrace.add(line);
	} else {
	String fileName;
	if (targetEntry.sourceUrlId != null) {
	fileName = sourceMap.urls[targetEntry.sourceUrlId];
	}
	int targetLine = targetEntry.sourceLine + 1;
	int targetColumn = targetEntry.sourceColumn + 1;

	if (expandDart2jsInliningData) {
	SourceFile file = new SourceFile.fromString(jsOutput);
	int offset = file.getOffset(line.lineNo - 1, line.columnNo - 1);
	Map<int, List<FrameEntry>> frames =
	_loadInlinedFrameData(sourceMap, sourceMapText);
	List<int> indices = frames.keys.toList()..sort();
	int key = binarySearch(indices, (i) => i > offset) - 1;
	int depth = 0;
	outer:
	while (key >= 0) {
	for (var frame in frames[indices[key]].reversed) {
	if (frame.isEmpty) break outer;
	if (frame.isPush) {
	if (depth <= 0) {
	dartStackTrace.add(new StackTraceLine(
	frame.inlinedMethodName + "(inlined)",
	fileName,
	targetLine,
	targetColumn,
	isMapped: true));
	fileName = frame.callUri;
	targetLine = frame.callLine + 1;
	targetColumn = frame.callColumn + 1;
	} else {
	depth--;
	}
	}
	if (frame.isPop) {
	depth++;
	}
	}
	key--;
	}
	targetEntry = findEnclosingFunction(jsOutput, file, offset, sourceMap);
	}

	String methodName;
	if (targetEntry.sourceNameId != null) {
	methodName = sourceMap.names[targetEntry.sourceNameId];
	} else if (useJsMethodNamesOnAbsence) {
	methodName = jsNameConverter(line.methodName);
	}

	dartStackTrace.add(new StackTraceLine(
	methodName, fileName, targetLine, targetColumn,
	isMapped: true));
	}
	}

	Expectations expectations = test.expectationMap[config];

	int expectedIndex = 0;
	List<StackTraceLine> unexpectedLines = <StackTraceLine>[];
	List<StackTraceLine> unexpectedBeforeLines = <StackTraceLine>[];
	List<StackTraceLine> unexpectedAfterLines = <StackTraceLine>[];
	for (StackTraceLine line in dartStackTrace) {
	bool found = false;
	if (expectedIndex < expectations.expectedLines.length) {
	StackTraceLine expectedLine = expectations.expectedLines[expectedIndex];
	if (line.methodName == expectedLine.methodName &&
	line.lineNo == expectedLine.lineNo &&
	line.columnNo == expectedLine.columnNo) {
	found = true;
	expectedIndex++;
	}
	}
	for (StackTraceLine unexpectedLine in expectations.unexpectedLines) {
	if (line.methodName == unexpectedLine.methodName &&
	line.lineNo == unexpectedLine.lineNo &&
	line.columnNo == unexpectedLine.columnNo) {
	unexpectedLines.add(line);
	}
	}
	if (line.isMapped && !found) {
	List<LineException> exceptions =
	expectedIndex == 0 ? beforeExceptions : afterExceptions;
	for (LineException exception in exceptions) {
	String fileName = exception.fileName;
	if (line.methodName == exception.methodName &&
	line.fileName.endsWith(fileName)) {
	found = true;
	}
	}
	if (!found) {
	if (expectedIndex == 0) {
	unexpectedBeforeLines.add(line);
	} else {
	unexpectedAfterLines.add(line);
	}
	}
	}
	}
	if (verbose) {
	print('JavaScript stacktrace:');
	print(jsStackTrace.join('\n'));
	print('\nDart stacktrace:');
	print(dartStackTrace.join('\n'));
	}
	Expect.equals(
	expectedIndex,
	expectations.expectedLines.length,
	"Missing stack trace lines for test:\n${test.code}\n"
	"Actual:\n${dartStackTrace.join('\n')}\n\n"
	"Expected:\n${expectations.expectedLines.join('\n')}\n");
	Expect.isTrue(
	unexpectedLines.isEmpty,
	"Unexpected stack trace lines for test:\n${test.code}\n"
	"Actual:\n${dartStackTrace.join('\n')}\n\n"
	"Unexpected:\n${expectations.unexpectedLines.join('\n')}\n");
	Expect.isTrue(
	unexpectedBeforeLines.isEmpty && unexpectedAfterLines.isEmpty,
	"Unexpected stack trace lines:\n${test.code}\n"
	"Actual:\n${dartStackTrace.join('\n')}\n\n"
	"Unexpected before:\n${unexpectedBeforeLines.join('\n')}\n\n"
	"Unexpected after:\n${unexpectedAfterLines.join('\n')}\n");

	if (forcedTmpDir == null) {
	print("Deleting '${tmpDir.path}'.");
	tmpDir.deleteSync(recursive: true);
	}
	}

	class StackTraceLine {
	String methodName;
	String fileName;
	int lineNo;
	int columnNo;
	bool isMapped;

	StackTraceLine(this.methodName, this.fileName, this.lineNo, this.columnNo,
	{this.isMapped: false});

	/// Creates a [StackTraceLine] by parsing a d8 stack trace line [text]. The
	/// expected formats are
	///
	/// at <methodName>(<fileName>:<lineNo>:<columnNo>)
	/// at <methodName>(<fileName>:<lineNo>)
	/// at <methodName>(<fileName>)
	/// at <fileName>:<lineNo>:<columnNo>
	/// at <fileName>:<lineNo>
	/// at <fileName>
	///
	factory StackTraceLine.fromText(String text) {
	text = text.trim();
	assert(text.startsWith('at '));
	text = text.substring('at '.length);
	String methodName;
	if (text.endsWith(')')) {
	int nameEnd = text.indexOf(' (');
	methodName = text.substring(0, nameEnd);
	text = text.substring(nameEnd + 2, text.length - 1);
	}
	int lineNo;
	int columnNo;
	String fileName;
	int lastColon = text.lastIndexOf(':');
	if (lastColon != -1) {
	int lastValue = int.tryParse(text.substring(lastColon + 1));
	if (lastValue != null) {
	int secondToLastColon = text.lastIndexOf(':', lastColon - 1);
	if (secondToLastColon != -1) {
	int secondToLastValue =
	int.tryParse(text.substring(secondToLastColon + 1, lastColon));
	if (secondToLastValue != null) {
	lineNo = secondToLastValue;
	columnNo = lastValue;
	fileName = text.substring(0, secondToLastColon);
	} else {
	lineNo = lastValue;
	fileName = text.substring(0, lastColon);
	}
	} else {
	lineNo = lastValue;
	fileName = text.substring(0, lastColon);
	}
	} else {
	fileName = text;
	}
	} else {
	fileName = text;
	}
	return new StackTraceLine(methodName, fileName, lineNo, columnNo);
	}

	String toString() {
	StringBuffer sb = new StringBuffer();
	sb.write(' at ');
	if (methodName != null) {
	sb.write(methodName);
	sb.write(' (');
	sb.write(fileName ?? '?');
	sb.write(':');
	sb.write(lineNo);
	sb.write(':');
	sb.write(columnNo);
	sb.write(')');
	} else {
	sb.write(fileName ?? '?');
	sb.write(':');
	sb.write(lineNo);
	sb.write(':');
	sb.write(columnNo);
	}
	return sb.toString();
	}
	}

	/// Returns [TargetLineEntry] which includes the location in the target [line]
	/// number. In particular, the resulting entry is the last entry whose line
	/// number is lower or equal to [line].
	///
	/// Copied from [SingleMapping._findLine].
	TargetLineEntry _findLine(SingleMapping sourceMap, StackTraceLine stLine) {
	String filename = stLine.fileName
	.substring(stLine.fileName.lastIndexOf(new RegExp("[\\\/]")) + 1);
	if (sourceMap.targetUrl != filename) return null;
	return _findLineInternal(sourceMap, stLine.lineNo - 1);
	}

	TargetLineEntry _findLineInternal(SingleMapping sourceMap, int line) {
	int index = binarySearch(sourceMap.lines, (e) => e.line > line);
	return (index <= 0) ? null : sourceMap.lines[index - 1];
	}

	/// Returns [TargetEntry] which includes the location denoted by
	/// [line], [column]. If [lineEntry] corresponds to [line], then this will be
	/// the last entry whose column is lower or equal than [column]. If
	/// [lineEntry] corresponds to a line prior to [line], then the result will be
	/// the very last entry on that line.
	///
	/// Copied from [SingleMapping._findColumn].
	TargetEntry _findColumn(int line, int column, TargetLineEntry lineEntry) {
	if (lineEntry == null \|\| lineEntry.entries.length == 0) return null;
	if (lineEntry.line != line) return lineEntry.entries.last;
	var entries = lineEntry.entries;
	int index = binarySearch(entries, (e) => e.column > column);
	return (index <= 0) ? null : entries[index - 1];
	}

	/// Returns the path of the d8 executable.
	String get d8executable {
	if (Platform.isWindows) {
	return 'third_party/d8/windows/d8.exe';
	} else if (Platform.isLinux) {
	return 'third_party/d8/linux/d8';
	} else if (Platform.isMacOS) {
	return 'third_party/d8/macos/d8';
	}
	throw new UnsupportedError('Unsupported platform.');
	}

	/// A line allowed in the mapped stack trace.
	class LineException {
	final String methodName;
	final String fileName;

	const LineException(this.methodName, this.fileName);
	}

	/// Search backwards in [sources] for a function declaration that includes the
	/// [start] offset.
	TargetEntry findEnclosingFunction(
	String sources, SourceFile file, int start, SingleMapping mapping) {
	if (sources == null) return null;
	var index = start;
	while (true) {
	index = nextDeclarationCandidate(sources, index);
	if (index < 0) return null;
	var line = file.getLine(index);
	var lineEntry = _findLineInternal(mapping, line);
	var result = _findColumn(line, file.getColumn(index), lineEntry);
	if (result?.column == file.getColumn(index)) return result;
	index--;
	}
	}

	/// Returns the index of a candidate location of a enclosing function
	/// declaration. We try to find the beginning of a `function` keyword or the
	/// `(` of an ES6 method definition, but the search contains some false
	/// positives. To rule out false positives, [findEnclosingFunction]
	/// validates that the returned location contains a source-map entry, searching
	/// for another candidate if not.
	int nextDeclarationCandidate(String sources, int start) {
	var indexForFunctionKeyword = sources.lastIndexOf('function', start);
	// We attempt to identify potential method definitions by looking for any '('
	// that precedes a '{'. This method will fail if 1) Dart2JS starts emitting
	// functions with initializers or 2) sourcemap boundaries appear at '(' for
	// non-method-definition constructs.
	var indexForMethodDefinition = sources.lastIndexOf('{', start);
	if (indexForFunctionKeyword > indexForMethodDefinition \|\|
	indexForFunctionKeyword < 0) {
	return indexForFunctionKeyword;
	}
	indexForMethodDefinition = sources.lastIndexOf('(', indexForMethodDefinition);
	return indexForFunctionKeyword > indexForMethodDefinition
	? indexForFunctionKeyword
	: indexForMethodDefinition;
	}

	Map<int, List<FrameEntry>> _loadInlinedFrameData(
	SingleMapping mapping, String sourceMapText) {
	var json = jsonDecode(sourceMapText);
	return Dart2jsMapping(mapping, json).frames;
	}