Rename fletch -> dartino

pkg/fletchc/lib/back_trace.dart

-// Copyright (c) 2015, the Dartino 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.md file.
-
-part of fletch.debug_state;
-
-class BackTraceFrame {
-  final FletchFunction function;
-  final int bytecodePointer;
-  final IncrementalCompiler compiler;
-  final DebugState debugState;
-
-  BackTraceFrame(this.function, this.bytecodePointer, this.compiler,
-                 this.debugState);
-
-  bool get inPlatformLibrary => function.element.library.isPlatformLibrary;
-
-  bool get isInternal => function.isInternal || inPlatformLibrary;
-
-  String invokeString(Bytecode bytecode) {
-    if (bytecode is InvokeMethod) {
-      String name =
-          compiler.lookupFunctionNameBySelector(bytecode.uint32Argument0);
-      return ' ($name)';
-    }
-    return '';
-  }
-
-  bool get isVisible => debugState.showInternalFrames || !isInternal;
-
-  DebugInfo get debugInfo => debugState.getDebugInfo(function);
-
-  String list(SessionState state, {int contextLines: 5}) {
-    return debugInfo.sourceListStringFor(
-        bytecodePointer - 1, state, contextLines: contextLines);
-  }
-
-  String disasm() {
-    StringBuffer buffer = new StringBuffer();
-    var bytecodes = function.bytecodes;
-    var offset = 0;
-    for (var bytecode in bytecodes) offset += bytecode.size;
-    int offsetLength = '$offset'.length;
-    offset = 0;
-    for (var i = 0; i  < bytecodes.length; i++) {
-      var source = debugInfo.astStringFor(offset);
-      var current = bytecodes[i];
-      var byteNumberString = '$offset:'.padLeft(offsetLength);
-      var invokeInfo = invokeString(current);
-      var bytecodeString = '$byteNumberString $current$invokeInfo';
-      var sourceString = '// $source';
-      var printString = bytecodeString.padRight(30) + sourceString;
-      offset += current.size;
-      var marker = (offset == bytecodePointer) ? '* ' : '  ';
-      buffer.writeln("$marker$printString");
-    }
-    return buffer.toString();
-  }
-
-  String shortString([int namePadding = 0]) {
-    String name = compiler.lookupFunctionName(function);
-    String astString = debugInfo.astStringFor(bytecodePointer - 1);
-    astString = (astString != null) ? '@$astString' : '';
-
-    String paddedName = name.padRight(namePadding);
-    String spaces = '';
-    if (astString.isNotEmpty) {
-      int missingSpaces = 4 - (paddedName.length % 4);
-      spaces = ' ' * missingSpaces;
-    }
-
-    return '$paddedName$spaces$astString';
-  }
-
-  SourceLocation sourceLocation() {
-    return debugInfo.sourceLocationFor(bytecodePointer - 1);
-  }
-
-  ScopeInfo scopeInfo() {
-    return debugInfo.scopeInfoFor(bytecodePointer - 1);
-  }
-
-  bool isSameSourceLocation(int offset,
-                            SourceLocation current) {
-    SourceLocation location = debugInfo.sourceLocationFor(offset);
-    // Treat locations for which we have no source information as the same
-    // as the previous location.
-    if (location == null || location.node == null) return true;
-    return location.isSameSourceLevelLocationAs(current);
-  }
-
-  int stepBytecodePointer(SourceLocation current) {
-    var bytecodes = function.bytecodes;
-    // Zip forward to the current bytecode. The bytecode pointer in the stack
-    // frame is the return address which is one bytecode after the current one.
-    var offset = 0;
-    var i = 0;
-    for (; i < bytecodes.length; i++) {
-      var currentSize = bytecodes[i].size;
-      if (offset + currentSize == bytecodePointer) break;
-      offset += currentSize;
-    }
-    // Move forward while we know step should not stop.
-    while (!bytecodes[i].isBranching &&
-           isSameSourceLocation(offset, current)) {
-      offset += bytecodes[i++].size;
-    }
-    return offset <= bytecodePointer ? -1 : offset;
-  }
-
-  int get functionId => function.functionId;
-}
-
-class BackTrace {
-  final List<BackTraceFrame> frames;
-  final DebugState debugState;
-
-  List<int> visibleFrameMapping;
-  int framesToGo;
-  int maxNameLength = 0;
-
-  BackTrace(int framesToGo, this.debugState)
-      : this.framesToGo = framesToGo,
-        frames = new List(framesToGo);
-
-  int get length => frames.length;
-
-  int get visibleFrames {
-    ensureVisibleFrameMap();
-    return visibleFrameMapping.length;
-  }
-
-  void addFrame(IncrementalCompiler compiler, BackTraceFrame frame) {
-    frames[--framesToGo] = frame;
-    String name = compiler.lookupFunctionName(frame.function);
-    var nameLength = name == null ? 0 : name.length;
-    if (nameLength > maxNameLength) maxNameLength = nameLength;
-  }
-
-  String format([int frame]) {
-    int currentFrame = frame != null ? frame : debugState.currentFrame;
-    StringBuffer buffer = new StringBuffer();
-    assert(framesToGo == 0);
-    int frameNumber = 0;
-    int frameNumberLength = '$frameNumber'.length;
-    for (var i = 0; i < frames.length; i++) {
-      if (!frames[i].isVisible) continue;
-      var marker = currentFrame == frameNumber ? '* ' : '  ';
-      var line = frames[i].shortString(maxNameLength);
-      String frameNumberString = '${frameNumber++}: '.padLeft(frameNumberLength);
-      buffer.writeln('$marker$frameNumberString$line');
-    }
-    return buffer.toString();
-  }
-
-  void ensureVisibleFrameMap() {
-    if (visibleFrameMapping == null) {
-      visibleFrameMapping = [];
-      for (int i = 0; i < frames.length; i++) {
-        if (frames[i].isVisible) visibleFrameMapping.add(i);
-      }
-    }
-  }
-
-  // Map user visible frame numbers to actual frame numbers.
-  int actualFrameNumber(int visibleFrameNumber) {
-    ensureVisibleFrameMap();
-    return (visibleFrameNumber < visibleFrameMapping.length)
-        ? visibleFrameMapping[visibleFrameNumber]
-        : -1;
-  }
-
-  BackTraceFrame visibleFrame(int frame) {
-    int frameNumber = actualFrameNumber(frame);
-    if (frameNumber == -1) return null;
-    return frames[frameNumber];
-  }
-
-  void visibilityChanged() {
-    visibleFrameMapping = null;
-  }
-
-  String list(SessionState state, [int frame]) {
-    if (frame == null) frame = debugState.currentFrame;
-    BackTraceFrame visibleStackFrame = visibleFrame(frame);
-    if (visibleStackFrame == null) return null;
-    return visibleStackFrame.list(state);
-  }
-
-  String disasm([int frame]) {
-    if (frame == null) frame = debugState.currentFrame;
-    BackTraceFrame visibleStackFrame = visibleFrame(frame);
-    if (visibleStackFrame == null) return null;
-    return visibleStackFrame.disasm();
-  }
-
-  SourceLocation sourceLocation() {
-    return frames[0].sourceLocation();
-  }
-
-  ScopeInfo scopeInfo(int frame) {
-    BackTraceFrame visibleStackFrame = visibleFrame(frame);
-    if (visibleStackFrame == null) return null;
-    return visibleStackFrame.scopeInfo();
-  }
-
-  ScopeInfo get scopeInfoForCurrentFrame => scopeInfo(debugState.currentFrame);
-
-  int stepBytecodePointer(SourceLocation location) {
-    return frames[0].stepBytecodePointer(location);
-  }
-}