Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler"

pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart

-// 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.
-
-library dart2js.ir_tracer;
-
-import 'dart:async' show EventSink;
-
-import 'cps_ir_nodes.dart' as cps_ir hide Function;
-import '../tracer.dart';
-
-/**
- * If true, show LetCont expressions in output.
- */
-const bool IR_TRACE_LET_CONT = false;
-
-class IRTracer extends TracerUtil implements cps_ir.Visitor {
-  EventSink<String> output;
-
-  IRTracer(this.output);
-
-  visit(cps_ir.Node node) => node.accept(this);
-
-  void traceGraph(String name, cps_ir.FunctionDefinition graph) {
-    tag("cfg", () {
-      printProperty("name", name);
-      visitFunctionDefinition(graph);
-    });
-  }
-
-  // Temporary field used during tree walk
-  Names names;
-
-  visitFunctionDefinition(cps_ir.FunctionDefinition f) {
-    names = new Names();
-    BlockCollector builder = new BlockCollector(names);
-    builder.visit(f);
-
-    printNode(builder.entry);
-    for (Block block in builder.cont2block.values) {
-      printNode(block);
-    }
-    names = null;
-  }
-
-  int countUses(cps_ir.Definition definition) {
-    int count = 0;
-    cps_ir.Reference ref = definition.firstRef;
-    while (ref != null) {
-      ++count;
-      ref = ref.next;
-    }
-    return count;
-  }
-
-  printNode(Block block) {
-    tag("block", () {
-      printProperty("name", block.name);
-      printProperty("from_bci", -1);
-      printProperty("to_bci", -1);
-      printProperty("predecessors", block.pred.map((n) => n.name));
-      printProperty("successors", block.succ.map((n) => n.name));
-      printEmptyProperty("xhandlers");
-      printEmptyProperty("flags");
-      tag("states", () {
-        tag("locals", () {
-          printProperty("size", 0);
-          printProperty("method", "None");
-        });
-      });
-      tag("HIR", () {
-        for (cps_ir.Parameter param in block.parameters) {
-          String name = names.name(param);
-          printStmt(name, "Parameter $name [useCount=${countUses(param)}]");
-        }
-        visit(block.body);
-      });
-    });
-  }
-
-  void printStmt(String resultVar, String contents) {
-    int bci = 0;
-    int uses = 0;
-    addIndent();
-    add("$bci $uses $resultVar $contents <|@\n");
-  }
-
-  visitLetPrim(cps_ir.LetPrim node) {
-    String id = names.name(node.primitive);
-    printStmt(id, "LetPrim $id = ${formatPrimitive(node.primitive)}");
-    visit(node.body);
-  }
-
-  visitLetCont(cps_ir.LetCont node) {
-    if (IR_TRACE_LET_CONT) {
-      String dummy = names.name(node);
-      String id = names.name(node.continuation);
-      printStmt(dummy, "LetCont $id = <$id>");
-    }
-    visit(node.body);
-  }
-
-  visitInvokeStatic(cps_ir.InvokeStatic node) {
-    String dummy = names.name(node);
-    String callName = node.selector.name;
-    String args = node.arguments.map(formatReference).join(', ');
-    String kont = formatReference(node.continuation);
-    printStmt(dummy, "InvokeStatic $callName ($args) $kont");
-  }
-
-  visitInvokeMethod(cps_ir.InvokeMethod node) {
-    String dummy = names.name(node);
-    String receiver = formatReference(node.receiver);
-    String callName = node.selector.name;
-    String args = node.arguments.map(formatReference).join(', ');
-    String kont = formatReference(node.continuation);
-    printStmt(dummy,
-        "InvokeMethod $receiver $callName ($args) $kont");
-  }
-
-  visitInvokeSuperMethod(cps_ir.InvokeSuperMethod node) {
-    String dummy = names.name(node);
-    String callName = node.selector.name;
-    String args = node.arguments.map(formatReference).join(', ');
-    String kont = formatReference(node.continuation);
-    printStmt(dummy,
-        "InvokeSuperMethod $callName ($args) $kont");
-  }
-
-  visitInvokeConstructor(cps_ir.InvokeConstructor node) {
-    String dummy = names.name(node);
-    String callName;
-    if (node.target.name.isEmpty) {
-      callName = '${node.type}';
-    } else {
-      callName = '${node.type}.${node.target.name}';
-    }
-    String args = node.arguments.map(formatReference).join(', ');
-    String kont = formatReference(node.continuation);
-    printStmt(dummy, "InvokeConstructor $callName ($args) $kont");
-  }
-
-  visitConcatenateStrings(cps_ir.ConcatenateStrings node) {
-    String dummy = names.name(node);
-    String args = node.arguments.map(formatReference).join(', ');
-    String kont = formatReference(node.continuation);
-    printStmt(dummy, "ConcatenateStrings ($args) $kont");
-  }
-
-  visitLiteralList(cps_ir.LiteralList node) {
-    String dummy = names.name(node);
-    String values = node.values.map(formatReference).join(', ');
-    printStmt(dummy, "LiteralList ($values)");
-  }
-
-  visitLiteralMap(cps_ir.LiteralMap node) {
-    String dummy = names.name(node);
-    List<String> entries = new List<String>();
-    for (cps_ir.LiteralMapEntry entry in node.entries) {
-      String key = formatReference(entry.key);
-      String value = formatReference(entry.value);
-      entries.add("$key: $value");
-    }
-    printStmt(dummy, "LiteralMap (${entries.join(', ')})");
-  }
-
-  visitTypeOperator(cps_ir.TypeOperator node) {
-    String dummy = names.name(node);
-    String operator = node.isTypeTest ? 'is' : 'as';
-    List<String> entries = new List<String>();
-    String receiver = formatReference(node.receiver);
-    printStmt(dummy, "TypeOperator ($operator $receiver ${node.type})");
-  }
-
-  visitInvokeContinuation(cps_ir.InvokeContinuation node) {
-    String dummy = names.name(node);
-    String kont = formatReference(node.continuation);
-    String args = node.arguments.map(formatReference).join(', ');
-    printStmt(dummy, "InvokeContinuation $kont ($args)");
-  }
-
-  visitBranch(cps_ir.Branch node) {
-    String dummy = names.name(node);
-    String condition = visit(node.condition);
-    String trueCont = formatReference(node.trueContinuation);
-    String falseCont = formatReference(node.falseContinuation);
-    printStmt(dummy, "Branch $condition ($trueCont, $falseCont)");
-  }
-
-  visitSetClosureVariable(cps_ir.SetClosureVariable node) {
-    String dummy = names.name(node);
-    String variable = node.variable.name;
-    String value = formatReference(node.value);
-    printStmt(dummy, 'SetClosureVariable $variable = $value');
-    visit(node.body);
-  }
-
-  visitDeclareFunction(cps_ir.DeclareFunction node) {
-    String dummy = names.name(node);
-    String variable = node.variable.name;
-    printStmt(dummy, 'DeclareFunction $variable');
-    visit(node.body);
-  }
-
-  String formatReference(cps_ir.Reference ref) {
-    cps_ir.Definition target = ref.definition;
-    if (target is cps_ir.Continuation && target.isReturnContinuation) {
-      return "return"; // Do not generate a name for the return continuation
-    } else {
-      return names.name(ref.definition);
-    }
-  }
-
-  String formatPrimitive(cps_ir.Primitive p) => visit(p);
-
-  visitConstant(cps_ir.Constant node) {
-    return "Constant ${node.expression.value}";
-  }
-
-  visitParameter(cps_ir.Parameter node) {
-    return "Parameter ${names.name(node)}";
-  }
-
-  visitContinuation(cps_ir.Continuation node) {
-    return "Continuation ${names.name(node)}";
-  }
-
-  visitIsTrue(cps_ir.IsTrue node) {
-    return "IsTrue(${names.name(node.value.definition)})";
-  }
-
-  visitThis(cps_ir.This node) {
-    return "This";
-  }
-
-  visitReifyTypeVar(cps_ir.ReifyTypeVar node) {
-    return "ReifyTypeVar ${node.typeVariable.name}";
-  }
-
-  visitCreateFunction(cps_ir.CreateFunction node) {
-    return "CreateFunction ${node.definition.element.name}";
-  }
-
-  visitGetClosureVariable(cps_ir.GetClosureVariable node) {
-    String variable = node.variable.name;
-    return 'GetClosureVariable $variable';
-  }
-
-
-  visitCondition(cps_ir.Condition c) {}
-  visitExpression(cps_ir.Expression e) {}
-  visitPrimitive(cps_ir.Primitive p) {}
-  visitDefinition(cps_ir.Definition d) {}
-  visitNode(cps_ir.Node n) {}
-}
-
-/**
- * Invents (and remembers) names for Continuations, Parameters, etc.
- * The names must match the conventions used by IR Hydra, e.g.
- * Continuations and Functions must have names of form B### since they
- * are visualized as basic blocks.
- */
-class Names {
-  final Map<Object, String> names = {};
-  final Map<String, int> counters = {
-    'r': 0,
-    'B': 0,
-    'v': 0,
-    'x': 0
-  };
-
-  String prefix(x) {
-    if (x is cps_ir.Parameter) return 'r';
-    if (x is cps_ir.Continuation || x is cps_ir.FunctionDefinition) return 'B';
-    if (x is cps_ir.Primitive) return 'v';
-    return 'x';
-  }
-
-  String name(x) {
-    String nam = names[x];
-    if (nam == null) {
-      String pref = prefix(x);
-      int id = counters[pref]++;
-      nam = names[x] = '${pref}${id}';
-    }
-    return nam;
-  }
-}
-
-/**
- * A vertex in the graph visualization, used in place of basic blocks.
- */
-class Block {
-  String name;
-  final List<cps_ir.Parameter> parameters;
-  final cps_ir.Expression body;
-  final List<Block> succ = <Block>[];
-  final List<Block> pred = <Block>[];
-
-  Block(this.name, this.parameters, this.body);
-
-  void addEdgeTo(Block successor) {
-    succ.add(successor);
-    successor.pred.add(this);
-  }
-}
-
-class BlockCollector extends cps_ir.Visitor {
-  Block entry;
-  final Map<cps_ir.Continuation, Block> cont2block =
-      <cps_ir.Continuation, Block>{};
-  Block current_block;
-
-  Names names;
-  BlockCollector(this.names);
-
-  Block getBlock(cps_ir.Continuation c) {
-    Block block = cont2block[c];
-    if (block == null) {
-      block = new Block(names.name(c), c.parameters, c.body);
-      cont2block[c] = block;
-    }
-    return block;
-  }
-
-  visitFunctionDefinition(cps_ir.FunctionDefinition f) {
-    entry = current_block = new Block(names.name(f), [], f.body);
-    visit(f.body);
-  }
-
-  visitLetPrim(cps_ir.LetPrim exp) {
-    visit(exp.body);
-  }
-
-  visitLetCont(cps_ir.LetCont exp) {
-    visit(exp.continuation);
-    visit(exp.body);
-  }
-
-  void addEdgeToContinuation(cps_ir.Reference continuation) {
-    cps_ir.Definition target = continuation.definition;
-    if (target is cps_ir.Continuation && !target.isReturnContinuation) {
-      current_block.addEdgeTo(getBlock(target));
-    }
-  }
-
-  visitInvokeStatic(cps_ir.InvokeStatic exp) {
-    addEdgeToContinuation(exp.continuation);
-  }
-
-  visitInvokeMethod(cps_ir.InvokeMethod exp) {
-    addEdgeToContinuation(exp.continuation);
-  }
-
-  visitInvokeConstructor(cps_ir.InvokeConstructor exp) {
-    addEdgeToContinuation(exp.continuation);
-  }
-
-  visitConcatenateStrings(cps_ir.ConcatenateStrings exp) {
-    addEdgeToContinuation(exp.continuation);
-  }
-
-  visitInvokeContinuation(cps_ir.InvokeContinuation exp) {
-    addEdgeToContinuation(exp.continuation);
-  }
-
-  visitSetClosureVariable(cps_ir.SetClosureVariable exp) {
-    visit(exp.body);
-  }
-
-  visitDeclareFunction(cps_ir.DeclareFunction exp) {
-    visit(exp.body);
-  }
-
-  visitBranch(cps_ir.Branch exp) {
-    cps_ir.Continuation trueTarget = exp.trueContinuation.definition;
-    if (!trueTarget.isReturnContinuation) {
-      current_block.addEdgeTo(getBlock(trueTarget));
-    }
-    cps_ir.Continuation falseTarget = exp.falseContinuation.definition;
-    if (!falseTarget.isReturnContinuation) {
-      current_block.addEdgeTo(getBlock(falseTarget));
-    }
-  }
-
-  visitContinuation(cps_ir.Continuation c) {
-    var old_node = current_block;
-    current_block = getBlock(c);
-    visit(c.body);
-    current_block = old_node;
-  }
-}