pkg/compiler/lib/src/helpers/trace.dart - sdk.git - Git at Google

 // Copyright (c) 2014, 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.

 part of dart2js.helpers;

 /// Function signature for [trace].
 typedef void Trace(String message,
                    {bool condition(String stackTrace),
                     int limit,
                     bool throwOnPrint});

 /**
  * Helper method for printing stack traces for debugging.
  *
  * [message] is printed as the header of the stack trace.
  *
  * If [condition] is provided, the stack trace is only printed if [condition]
  * returns [:true:] on the stack trace text. This can be used to filter the
  * printed stack traces based on their content. For instance only print stack
  * traces that contain specific paths.
  *
  * If [limit] is provided, the stack trace is limited to [limit] entries.
  *
  * If [throwOnPrint] is `true`, [message] will be thrown after the stack trace
  * has been printed. Together with [condition] this can be used to discover
  * unknown call-sites in tests by filtering known call-sites and throwning
  * otherwise.
  */
 Trace get trace {
   enableDebugMode();
   return _trace;
 }

 void _trace(String message, {bool condition(String stackTrace), int limit,
                              bool throwOnPrint: false}) {
   try {
     throw '';
   } catch (e, s) {
     String stackTrace;
     try {
       stackTrace = prettifyStackTrace(
           s, rangeStart: 1, rangeEnd: limit, filePrefix: stackTraceFilePrefix);
     } catch (e) {
       print(e);
       stackTrace = '$s';
     }
     if (condition != null) {
       if (!condition(stackTrace)) return;
     }
     print('$message\n$stackTrace');
     if (throwOnPrint) throw message;
   }
 }

 /// Creates a function to use as an `condition` argument in [trace] that filters
 /// stack traces that contains any of the [exceptions].
 traceExceptions(List<String> exceptions) {
   return (String stackTrace) => !exceptions.any(stackTrace.contains);
 }

 /// Function signature of [traceAndReport].
 typedef void TraceAndReport(Compiler compiler, Spannable node, String message,
                             {bool condition(String stackTrace), int limit,
                              bool throwOnPrint});

 /// Calls [reportHere] and [trace] with the same message.
 TraceAndReport get traceAndReport {
   enableDebugMode();
   return _traceAndReport;
 }

 /// Calls [reportHere] and [trace] with the same message.
 TraceAndReport get reportAndTrace => traceAndReport;

 /// Implementation of [traceAndReport].
 void _traceAndReport(Compiler compiler, Spannable node, String message,
                      {bool condition(String stackTrace), int limit,
                       bool throwOnPrint: false}) {

   trace(message, limit: limit, throwOnPrint: throwOnPrint,
         condition: (String stackTrace) {
     bool result = condition != null ? condition(stackTrace) : true;
     if (result) {
       reportHere(compiler, node, message);
     }
     return result;
   });
 }

 /// Returns the [StackTraceLines] for the current call stack.
 ///
 /// Use [offset] to discard the first [offset] calls of the call stack. Defaults
 /// to `1`, that is, discard the call to [stackTrace] itself. Use [limit] to
 /// limit the length of the stack trace lines.
 StackTraceLines stackTrace({int offset: 1,
                             int limit: null}) {
   int rangeStart = offset;
   int rangeEnd = limit == null ? null : rangeStart + limit;
   try {
     throw '';
   } catch (_, stackTrace) {
     return new StackTraceLines.fromTrace(stackTrace,
         rangeStart: offset, rangeEnd: rangeEnd,
         filePrefix: stackTraceFilePrefix);
   }
   return null;
 }

 /// A stack trace as a sequence of [StackTraceLine]s.
 class StackTraceLines {
   final List<StackTraceLine> lines;
   final int maxFileLength;
   final int maxLineNoLength;
   final int maxColumnNoLength;

   factory StackTraceLines.fromTrace(StackTrace s,
                                     {int rangeStart,
                                      int rangeEnd,
                                      String filePrefix,
                                      String lambda: r'?'}) {
     final RegExp indexPattern = new RegExp(r'#\d+\s*');
     int index = -1;
     int maxFileLength = 0;
     int maxLineNoLength = 0;
     int maxColumnNoLength = 0;

     String stackTrace = '$s';
     List<StackTraceLine> lines = <StackTraceLine>[];
     // Parse each line in the stack trace. The supported line formats from the
     // Dart VM are:
     //    #n     <method-name> (<uri>:<line-no>:<column-no>)
     //    #n     <method-name> (<uri>:<line-no>)
     //    #n     <method-name> (<uri>)
     // in which '<anonymous closure>' is the name used for an (unnamed) function
     // expression. The last case is used for async bodies.
     for (String line in stackTrace.split('\n')) {
       try {
         index++;
         if (rangeStart != null && index < rangeStart) continue;
         if (rangeEnd != null && index > rangeEnd) break;
         if (line.isEmpty) continue;

         // Strip index.
         line = line.replaceFirst(indexPattern, '');

         int leftParenPos = line.indexOf('(');
         int rightParenPos = line.indexOf(')', leftParenPos);
         int lastColon = line.lastIndexOf(':', rightParenPos);
         int nextToLastColon = line.lastIndexOf(':', lastColon-1);

         String lineNo;
         String columnNo;
         if (nextToLastColon != -1) {
           lineNo = line.substring(nextToLastColon+1, lastColon);
           columnNo = line.substring(lastColon+1, rightParenPos);
           try {
             int.parse(columnNo);
             try {
               int.parse(lineNo);
             } on FormatException {
               // Only line number.
               lineNo = columnNo;
               columnNo = '';
               nextToLastColon = lastColon;
             }
           } on FormatException {
             // No column number nor line number.
             lineNo = '';
             columnNo = '';
             nextToLastColon = rightParenPos;
           }
         } else {
           lineNo = line.substring(lastColon+1, rightParenPos);
           columnNo = '';
           try {
             int.parse(lineNo);
             nextToLastColon = lastColon;
           } on FormatException {
             // No column number nor line number.
             lineNo = columnNo;
             columnNo = '';
             nextToLastColon = rightParenPos;
           }
         }

         if (lineNo.length > maxLineNoLength) {
           maxLineNoLength = lineNo.length;
         }
         if (columnNo.length > maxColumnNoLength) {
           maxColumnNoLength = columnNo.length;
         }

         String file = line.substring(leftParenPos+1, nextToLastColon);
         if (filePrefix != null && file.startsWith(filePrefix)) {
           file = file.substring(filePrefix.length);
         }
         if (file.length > maxFileLength) {
           maxFileLength = file.length;
         }
         String method = line.substring(0, leftParenPos-1);
         if (lambda != null) {
           method = method.replaceAll('<anonymous closure>', lambda);
         }
         lines.add(new StackTraceLine(index, file, lineNo, columnNo, method));
       } catch (e) {
         throw 'Error prettifying "$line": $e';
       }
     }
     return new StackTraceLines.fromLines(
         lines, maxFileLength, maxLineNoLength, maxColumnNoLength);
   }

   StackTraceLines.fromLines(this.lines,
                             this.maxFileLength,
                             this.maxLineNoLength,
                             this.maxColumnNoLength);

   StackTraceLines subtrace(int offset) {
     return new StackTraceLines.fromLines(
         lines.sublist(offset),
         maxFileLength,
         maxLineNoLength,
         maxColumnNoLength);
   }

   String prettify({bool showColumnNo: false,
                    bool showDots: true}) {
     StringBuffer sb = new StringBuffer();
     bool dots = true;
     for (StackTraceLine line in lines) {
       sb.write('  ');
       line.printOn(sb,
         fileLength: maxFileLength,
         padding: showDots && dots ? ' .' : ' ',
         lineNoLength: maxLineNoLength,
         showColumnNo: showColumnNo,
         columnNoLength: maxColumnNoLength);

       dots = !dots;
     }
     return sb.toString();
   }

   String toString() {
     return prettify();
   }
 }

 /// A parsed line from a stack trace.
 class StackTraceLine {
   final int index;
   final String file;
   final String lineNo;
   final String columnNo;
   final String method;

   StackTraceLine(this.index, this.file, this.lineNo,
                   this.columnNo, this.method);

   void printOn(StringBuffer sb,
                {String padding: ' ',
                 int fileLength,
                 int lineNoLength,
                 int columnNoLength,
                 bool showColumnNo: false}) {
     String fileText = '${file} ';
     if (fileLength != null) {
       fileText = pad(fileText, fileLength, dots: padding);
     }
     String lineNoText = lineNo;
     if (lineNoLength != null) {
       lineNoText = pad(lineNoText, lineNoLength, padLeft: true);
     }
     String columnNoText = showColumnNo ? '': columnNo;
     if (columnNoLength != null) {
         columnNoText = ':${pad(columnNoText, columnNoLength)}';
     }
     sb.write('$fileText $lineNoText$columnNoText $method\n');
   }

   int get hashCode {
     return 13 * index +
            17 * file.hashCode +
            19 * lineNo.hashCode +
            23 * columnNo.hashCode +
            29 * method.hashCode;
   }

   bool operator ==(other) {
     if (identical(this, other)) return true;
     if (other is! StackTraceLine) return false;
     return index == other.index &&
            file == other.file &&
            lineNo == other.lineNo &&
            columnNo == other.columnNo &&
            method == other.method;
   }

   String toString() => "$method @ $file [$lineNo:$columnNo]";
 }

 // TODO(johnniwinther): Use this format for --throw-on-error.
 /**
  * Converts the normal VM stack trace into a more compact and readable format.
  *
  * The output format is [: <file> . . . <lineNo>:<columnNo> <method> :] where
  * [: <file> :] is file name, [: <lineNo> :] is the line number,
  * [: <columnNo> :] is the column number, and [: <method> :] is the method name.
  *
  * If [rangeStart] and/or [rangeEnd] are provided, only the lines within the
  * range are included.
  * If [showColumnNo] is [:false:], the [: :<columnNo> :] part is omitted.
  * If [showDots] is [:true:], the space between [: <file> :] and [: <lineNo> :]
  * is padded with dots on every other line.
  * If [filePrefix] is provided, then for  every file name thats starts with
  * [filePrefix] only the remainder is printed.
  * If [lambda] is non-null, anonymous closures are printed as [lambda].
  */
 String prettifyStackTrace(StackTrace stackTrace,
                           {int rangeStart,
                            int rangeEnd,
                            bool showColumnNo: false,
                            bool showDots: true,
                            String filePrefix,
                            String lambda: r'?'}) {
   return new StackTraceLines.fromTrace(stackTrace,
       rangeStart: rangeStart, rangeEnd: rangeEnd,
       filePrefix: filePrefix, lambda: lambda)
     .prettify(showColumnNo: showColumnNo, showDots: showDots);
 }

 /**
  * Pads (or truncates) [text] to the [intendedLength].
  *
  * If [padLeft] is [:true:] the text is padding inserted to the left of [text].
  * A repetition of the [dots] text is used for padding.
  */
 String pad(String text, int intendedLength,
            {bool padLeft: false, String dots: ' '}) {
   if (text.length == intendedLength) return text;
   if (text.length > intendedLength) return text.substring(0, intendedLength);
   if (dots == null || dots.isEmpty) dots = ' ';
   int dotsLength = dots.length;
   StringBuffer sb = new StringBuffer();
   if (!padLeft) {
     sb.write(text);
   }
   for (int index = text.length ; index < intendedLength ; index ++) {
     int dotsIndex = index % dotsLength;
     sb.write(dots.substring(dotsIndex, dotsIndex + 1));
   }
   if (padLeft) {
     sb.write(text);
   }
   return sb.toString();
 }
	// Copyright (c) 2014, 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.

	part of dart2js.helpers;

	/// Function signature for [trace].
	typedef void Trace(String message,
	{bool condition(String stackTrace),
	int limit,
	bool throwOnPrint});

	/**
	* Helper method for printing stack traces for debugging.
	*
	* [message] is printed as the header of the stack trace.
	*
	* If [condition] is provided, the stack trace is only printed if [condition]
	* returns [:true:] on the stack trace text. This can be used to filter the
	* printed stack traces based on their content. For instance only print stack
	* traces that contain specific paths.
	*
	* If [limit] is provided, the stack trace is limited to [limit] entries.
	*
	* If [throwOnPrint] is `true`, [message] will be thrown after the stack trace
	* has been printed. Together with [condition] this can be used to discover
	* unknown call-sites in tests by filtering known call-sites and throwning
	* otherwise.
	*/
	Trace get trace {
	enableDebugMode();
	return _trace;
	}

	void _trace(String message, {bool condition(String stackTrace), int limit,
	bool throwOnPrint: false}) {
	try {
	throw '';
	} catch (e, s) {
	String stackTrace;
	try {
	stackTrace = prettifyStackTrace(
	s, rangeStart: 1, rangeEnd: limit, filePrefix: stackTraceFilePrefix);
	} catch (e) {
	print(e);
	stackTrace = '$s';
	}
	if (condition != null) {
	if (!condition(stackTrace)) return;
	}
	print('$message\n$stackTrace');
	if (throwOnPrint) throw message;
	}
	}

	/// Creates a function to use as an `condition` argument in [trace] that filters
	/// stack traces that contains any of the [exceptions].
	traceExceptions(List<String> exceptions) {
	return (String stackTrace) => !exceptions.any(stackTrace.contains);
	}

	/// Function signature of [traceAndReport].
	typedef void TraceAndReport(Compiler compiler, Spannable node, String message,
	{bool condition(String stackTrace), int limit,
	bool throwOnPrint});

	/// Calls [reportHere] and [trace] with the same message.
	TraceAndReport get traceAndReport {
	enableDebugMode();
	return _traceAndReport;
	}

	/// Calls [reportHere] and [trace] with the same message.
	TraceAndReport get reportAndTrace => traceAndReport;

	/// Implementation of [traceAndReport].
	void _traceAndReport(Compiler compiler, Spannable node, String message,
	{bool condition(String stackTrace), int limit,
	bool throwOnPrint: false}) {

	trace(message, limit: limit, throwOnPrint: throwOnPrint,
	condition: (String stackTrace) {
	bool result = condition != null ? condition(stackTrace) : true;
	if (result) {
	reportHere(compiler, node, message);
	}
	return result;
	});
	}

	/// Returns the [StackTraceLines] for the current call stack.
	///
	/// Use [offset] to discard the first [offset] calls of the call stack. Defaults
	/// to `1`, that is, discard the call to [stackTrace] itself. Use [limit] to
	/// limit the length of the stack trace lines.
	StackTraceLines stackTrace({int offset: 1,
	int limit: null}) {
	int rangeStart = offset;
	int rangeEnd = limit == null ? null : rangeStart + limit;
	try {
	throw '';
	} catch (_, stackTrace) {
	return new StackTraceLines.fromTrace(stackTrace,
	rangeStart: offset, rangeEnd: rangeEnd,
	filePrefix: stackTraceFilePrefix);
	}
	return null;
	}

	/// A stack trace as a sequence of [StackTraceLine]s.
	class StackTraceLines {
	final List<StackTraceLine> lines;
	final int maxFileLength;
	final int maxLineNoLength;
	final int maxColumnNoLength;

	factory StackTraceLines.fromTrace(StackTrace s,
	{int rangeStart,
	int rangeEnd,
	String filePrefix,
	String lambda: r'?'}) {
	final RegExp indexPattern = new RegExp(r'#\d+\s*');
	int index = -1;
	int maxFileLength = 0;
	int maxLineNoLength = 0;
	int maxColumnNoLength = 0;

	String stackTrace = '$s';
	List<StackTraceLine> lines = <StackTraceLine>[];
	// Parse each line in the stack trace. The supported line formats from the
	// Dart VM are:
	// #n <method-name> (<uri>:<line-no>:<column-no>)
	// #n <method-name> (<uri>:<line-no>)
	// #n <method-name> (<uri>)
	// in which '<anonymous closure>' is the name used for an (unnamed) function
	// expression. The last case is used for async bodies.
	for (String line in stackTrace.split('\n')) {
	try {
	index++;
	if (rangeStart != null && index < rangeStart) continue;
	if (rangeEnd != null && index > rangeEnd) break;
	if (line.isEmpty) continue;

	// Strip index.
	line = line.replaceFirst(indexPattern, '');

	int leftParenPos = line.indexOf('(');
	int rightParenPos = line.indexOf(')', leftParenPos);
	int lastColon = line.lastIndexOf(':', rightParenPos);
	int nextToLastColon = line.lastIndexOf(':', lastColon-1);

	String lineNo;
	String columnNo;
	if (nextToLastColon != -1) {
	lineNo = line.substring(nextToLastColon+1, lastColon);
	columnNo = line.substring(lastColon+1, rightParenPos);
	try {
	int.parse(columnNo);
	try {
	int.parse(lineNo);
	} on FormatException {
	// Only line number.
	lineNo = columnNo;
	columnNo = '';
	nextToLastColon = lastColon;
	}
	} on FormatException {
	// No column number nor line number.
	lineNo = '';
	columnNo = '';
	nextToLastColon = rightParenPos;
	}
	} else {
	lineNo = line.substring(lastColon+1, rightParenPos);
	columnNo = '';
	try {
	int.parse(lineNo);
	nextToLastColon = lastColon;
	} on FormatException {
	// No column number nor line number.
	lineNo = columnNo;
	columnNo = '';
	nextToLastColon = rightParenPos;
	}
	}

	if (lineNo.length > maxLineNoLength) {
	maxLineNoLength = lineNo.length;
	}
	if (columnNo.length > maxColumnNoLength) {
	maxColumnNoLength = columnNo.length;
	}

	String file = line.substring(leftParenPos+1, nextToLastColon);
	if (filePrefix != null && file.startsWith(filePrefix)) {
	file = file.substring(filePrefix.length);
	}
	if (file.length > maxFileLength) {
	maxFileLength = file.length;
	}
	String method = line.substring(0, leftParenPos-1);
	if (lambda != null) {
	method = method.replaceAll('<anonymous closure>', lambda);
	}
	lines.add(new StackTraceLine(index, file, lineNo, columnNo, method));
	} catch (e) {
	throw 'Error prettifying "$line": $e';
	}
	}
	return new StackTraceLines.fromLines(
	lines, maxFileLength, maxLineNoLength, maxColumnNoLength);
	}

	StackTraceLines.fromLines(this.lines,
	this.maxFileLength,
	this.maxLineNoLength,
	this.maxColumnNoLength);

	StackTraceLines subtrace(int offset) {
	return new StackTraceLines.fromLines(
	lines.sublist(offset),
	maxFileLength,
	maxLineNoLength,
	maxColumnNoLength);
	}

	String prettify({bool showColumnNo: false,
	bool showDots: true}) {
	StringBuffer sb = new StringBuffer();
	bool dots = true;
	for (StackTraceLine line in lines) {
	sb.write(' ');
	line.printOn(sb,
	fileLength: maxFileLength,
	padding: showDots && dots ? ' .' : ' ',
	lineNoLength: maxLineNoLength,
	showColumnNo: showColumnNo,
	columnNoLength: maxColumnNoLength);

	dots = !dots;
	}
	return sb.toString();
	}

	String toString() {
	return prettify();
	}
	}

	/// A parsed line from a stack trace.
	class StackTraceLine {
	final int index;
	final String file;
	final String lineNo;
	final String columnNo;
	final String method;

	StackTraceLine(this.index, this.file, this.lineNo,
	this.columnNo, this.method);

	void printOn(StringBuffer sb,
	{String padding: ' ',
	int fileLength,
	int lineNoLength,
	int columnNoLength,
	bool showColumnNo: false}) {
	String fileText = '${file} ';
	if (fileLength != null) {
	fileText = pad(fileText, fileLength, dots: padding);
	}
	String lineNoText = lineNo;
	if (lineNoLength != null) {
	lineNoText = pad(lineNoText, lineNoLength, padLeft: true);
	}
	String columnNoText = showColumnNo ? '': columnNo;
	if (columnNoLength != null) {
	columnNoText = ':${pad(columnNoText, columnNoLength)}';
	}
	sb.write('$fileText $lineNoText$columnNoText $method\n');
	}

	int get hashCode {
	return 13 * index +
	17 * file.hashCode +
	19 * lineNo.hashCode +
	23 * columnNo.hashCode +
	29 * method.hashCode;
	}

	bool operator ==(other) {
	if (identical(this, other)) return true;
	if (other is! StackTraceLine) return false;
	return index == other.index &&
	file == other.file &&
	lineNo == other.lineNo &&
	columnNo == other.columnNo &&
	method == other.method;
	}

	String toString() => "$method @ $file [$lineNo:$columnNo]";
	}

	// TODO(johnniwinther): Use this format for --throw-on-error.
	/**
	* Converts the normal VM stack trace into a more compact and readable format.
	*
	* The output format is [: <file> . . . <lineNo>:<columnNo> <method> :] where
	* [: <file> :] is file name, [: <lineNo> :] is the line number,
	* [: <columnNo> :] is the column number, and [: <method> :] is the method name.
	*
	* If [rangeStart] and/or [rangeEnd] are provided, only the lines within the
	* range are included.
	* If [showColumnNo] is [:false:], the [: :<columnNo> :] part is omitted.
	* If [showDots] is [:true:], the space between [: <file> :] and [: <lineNo> :]
	* is padded with dots on every other line.
	* If [filePrefix] is provided, then for every file name thats starts with
	* [filePrefix] only the remainder is printed.
	* If [lambda] is non-null, anonymous closures are printed as [lambda].
	*/
	String prettifyStackTrace(StackTrace stackTrace,
	{int rangeStart,
	int rangeEnd,
	bool showColumnNo: false,
	bool showDots: true,
	String filePrefix,
	String lambda: r'?'}) {
	return new StackTraceLines.fromTrace(stackTrace,
	rangeStart: rangeStart, rangeEnd: rangeEnd,
	filePrefix: filePrefix, lambda: lambda)
	.prettify(showColumnNo: showColumnNo, showDots: showDots);
	}

	/**
	* Pads (or truncates) [text] to the [intendedLength].
	*
	* If [padLeft] is [:true:] the text is padding inserted to the left of [text].
	* A repetition of the [dots] text is used for padding.
	*/
	String pad(String text, int intendedLength,
	{bool padLeft: false, String dots: ' '}) {
	if (text.length == intendedLength) return text;
	if (text.length > intendedLength) return text.substring(0, intendedLength);
	if (dots == null \|\| dots.isEmpty) dots = ' ';
	int dotsLength = dots.length;
	StringBuffer sb = new StringBuffer();
	if (!padLeft) {
	sb.write(text);
	}
	for (int index = text.length ; index < intendedLength ; index ++) {
	int dotsIndex = index % dotsLength;
	sb.write(dots.substring(dotsIndex, dotsIndex + 1));
	}
	if (padLeft) {
	sb.write(text);
	}
	return sb.toString();
	}