lib/cfg.js - compiler-explorer - Rivoreo Source Code Repositories

 // Copyright (c) 2012-2018, Najjar Chedy
 //
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 //     * Redistributions of source code must retain the above copyright notice,
 //       this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above copyright
 //       notice, this list of conditions and the following disclaimer in the
 //       documentation and/or other materials provided with the distribution.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.
 var _ = require('underscore-node'),
     logger = require('./logger').logger;

 var InstructionType_jmp = 0;
 var InstructionType_conditionalJmpInst = 1;
 var InstructionType_notRetInst = 2;
 var InstructionType_retInst = 3;

 var isFunctionName = function (x) {
     return x.text.trim().indexOf('.') !== 0 &&
         !x.text.includes(' for ');// deal with typeinfo name for, typeinfo for, vtable for
 };

 // this mess is intended to be ported to another file.
 function separateCodeFromData(asmArr) {

     var jmpLabelRegex = /\.L{1}\d+:/;

     var isCode = function (x) {
         return x && x.text && (x.source !== null || jmpLabelRegex.test(x.text) ||
             isFunctionName(x));
     };

     return _.chain(asmArr)
         .map(_.clone)
         .filter(isCode)
         .value();
 }

 var gccX86 = {
     filterData: separateCodeFromData,
     isFunctionEnd: function (x) {
         return ((x[0] !== ' ') && (x[0] !== '.') &&
             (x.indexOf(':') !== -1));
     },

     isBasicBlockEnd: function (inst, prevInst) {
         return inst[0] === '.' || prevInst.includes(' ret');
     },

     getInstructionType: function (inst) {
         if (inst.includes('jmp')) return InstructionType_jmp;
         else if (inst.trim()[0] === 'j') return InstructionType_conditionalJmpInst;
         else if (!inst.includes(' ret')) return InstructionType_notRetInst;
         else return InstructionType_retInst;
     },

     extractNodeName: function (inst) {
         var name = inst.match(/\.L{1}\d+/);
         return name + ':';
     },

     isJmpInstruction: function (x) {
         var trimed = x.trim();
         return ( trimed[0] === 'j');
     }
 };

 function separateCodeFromData_(asmArr) {

     var jmpLabelRegex = /\.LBB\d+_\d+:/;

     var isCode = function (x) {
         return x && x.text && (x.source !== null || jmpLabelRegex.test(x.text) ||
             isFunctionName(x));
     };

     var removeComments = function (x) {
         var pos = x.text.indexOf('#');
         if (pos !== -1)
             x.text = x.text.substring(0, pos - 1);
         return x;
     };

     return _.chain(asmArr)
         .map(_.clone)
         .filter(isCode)
         .map(removeComments)
         .value();
 }

 var clangX86 = {
     filterData: separateCodeFromData_,
     isFunctionEnd: function (x) {
         return ((x[0] !== ' ') && (x[0] !== '.') &&
             (x.indexOf(':') !== -1));
     },

     isBasicBlockEnd: function (inst, prevInst) {
         return inst[0] === '.' || prevInst.includes(' ret');
     },

     getInstructionType: function (inst) {
         if (inst.includes('jmp')) return InstructionType_jmp;
         else if (inst.trim()[0] === 'j') return InstructionType_conditionalJmpInst;
         else if (!inst.includes(' ret')) return InstructionType_notRetInst;
         else return InstructionType_retInst;
     },

     extractNodeName: function (inst) {
         var name = inst.match(/\.LBB\d+_\d+/);
         return name + ':';
     },

     isJmpInstruction: function (x) {
         var trimed = x.trim();
         return ( trimed[0] === 'j');
     }
 };

 function ControlFlowGraph(compiler) {
     if (compiler.includes('clang'))
         this.rules = clangX86;
     else
         this.rules = gccX86;
 }

 ControlFlowGraph.prototype.splitToFunctions = function (asmArr, isEnd) {
     if (asmArr.length === 0) return [];
     var result = [];
     var first = 1;
     var last = asmArr.length;
     var fnRange = {start: 0, end: null};
     while (first !== last) {
         if (isEnd(asmArr[first].text)) {
             fnRange.end = first;
             result.push(_.clone(fnRange));
             fnRange.start = first;
         }
         ++first;
     }

     fnRange.end = last;
     result.push(_.clone(fnRange));
     return result;
 };

 ControlFlowGraph.prototype.splitToBasicBlocks = function (asmArr, range, isEnd, isJmp) {
     var first = range.start;
     var last = range.end;
     if (first === last) return [];
     var functionName = asmArr[first].text;
     ++first;

     var rangeBb = {nameId: functionName.substr(0, 50), start: first, end: null, actionPos: []};
     var result = [];

     var newRangeWith = function (oldRange, nameId, start) {
         return {nameId: nameId, start: start, actionPos: [], end: oldRange.end};
     };

     while (first < last) {
         var inst = asmArr[first].text;
         if (isEnd(inst, asmArr[first - 1] ? asmArr[first - 1].text : '')) {
             rangeBb.end = first;
             result.push(_.clone(rangeBb));
             //inst is expected to be .L*: where * in 1,2,...
             rangeBb = newRangeWith(rangeBb, inst, first + 1);
         }
         else if (isJmp(inst)) {
             rangeBb.actionPos.push(first);
         }
         ++first;
     }

     rangeBb.end = last;
     result.push(_.clone(rangeBb));
     return result;
 };

 ControlFlowGraph.prototype.splitToCanonicalBasicBlock = function (basicBlock) {
     var actionPos = basicBlock.actionPos;
     var actPosSz = actionPos.length;
     if (actionPos[actPosSz - 1] + 1 === basicBlock.end) {
         --actPosSz;
     }

     if (actPosSz === 0)
         return [{
             nameId: basicBlock.nameId,
             start: basicBlock.start,
             end: basicBlock.end
         }];
     else if (actPosSz === 1)
         return [
             {nameId: basicBlock.nameId, start: basicBlock.start, end: actionPos[0] + 1},
             {nameId: basicBlock.nameId + '@' + (actionPos[0] + 1), start: actionPos[0] + 1, end: basicBlock.end}
         ];
     else {
         var first = 0;
         var last = actPosSz;
         var blockName = basicBlock.nameId;
         var tmp = {nameId: blockName, start: basicBlock.start, end: actionPos[first] + 1};
         var result = [];
         result.push(_.clone(tmp));
         while (first !== last - 1) {
             tmp.nameId = blockName + '@' + (actionPos[first] + 1);
             tmp.start = actionPos[first] + 1;
             ++first;
             tmp.end = actionPos[first] + 1;
             result.push(_.clone(tmp));
         }

         tmp = {nameId: blockName + '@' + (actionPos[first] + 1), start: actionPos[first] + 1, end: basicBlock.end};
         result.push(_.clone(tmp));

         return result;

     }

 };

 ControlFlowGraph.prototype.concatInstructions = function (asmArr, first, last) {
     return _.chain(asmArr.slice(first, last))
         .map(function (x) {
             return x.text.substr(0, 50);
         })
         .value()
         .join('\n');
 };

 ControlFlowGraph.prototype.makeNodes = function (asmArr, arrOfCanonicalBasicBlock) {
     var node = {};
     var nodes = [];

     _.each(arrOfCanonicalBasicBlock, _.bind(function (elm) {
         logger.debug('node name:');
         logger.debug(elm.nameId);
         node.id = elm.nameId;
         node.label = elm.nameId + ((elm.nameId.indexOf(':') !== -1) ? '' : ':') + '\n' +
             this.concatInstructions(asmArr, elm.start, elm.end);
         node.color = '#99ccff';
         node.shape = 'box';
         nodes.push(_.clone(node));
     }, this));
     return nodes;
 };

 ControlFlowGraph.prototype.makeEdges = function (asmArr, arrOfCanonicalBasicBlock, instructionType, extractNodeNameFromInstruction) {
     var edge = {};
     var edges = [];

     var setEdge = function (edge, sourceNode, targetNode, color) {
         edge.from = sourceNode;
         edge.to = targetNode;
         edge.arrows = 'to';
         edge.color = color;
     };
     var isBasicBlockEnd = this.rules.isBasicBlockEnd;

     var hasName = function (asmArr, cbb) {
         var asm = asmArr[cbb.end];
         return asm ? isBasicBlockEnd(asm.text, '') : false;
     };

     var generateName = function (name, suffix) {
         var pos = name.indexOf('@');
         if (pos === -1)
             return name + '@' + suffix;

         return name.substring(0, pos + 1) + suffix;
     };

     // note: x.end-1 possible value: jmp .L*, {jne,je,jg,...} .L*, ret/rep ret, call and any other instruction that doesn't change control flow

     _.each(arrOfCanonicalBasicBlock, function (x) {
         var targetNode;
         var lastInst = asmArr[x.end - 1].text;
         switch (instructionType(lastInst)) {
             case InstructionType_jmp: {

                 //we have to deal only with jmp destination, jmp instruction are always taken.
                 //edge from jump inst
                 logger.debug('jmp');
                 targetNode = extractNodeNameFromInstruction(lastInst);
                 setEdge(edge, x.nameId, targetNode, 'blue');

                 edges.push(_.clone(edge));
                 logger.debug(edge);
             }
                 break;
             case InstructionType_conditionalJmpInst: {
                 logger.debug('condit jmp');
                 //deal with : branch taken, branch not taken
                 targetNode = extractNodeNameFromInstruction(lastInst);
                 setEdge(edge, x.nameId, targetNode, 'green');
                 edges.push(_.clone(edge));
                 logger.debug(edge);

                 targetNode = hasName(asmArr, x) ? asmArr[x.end].text : generateName(x.nameId, x.end);
                 setEdge(edge, x.nameId, targetNode, 'red');
                 edges.push(_.clone(edge));

                 logger.debug(edge);
             }
                 break;
             case InstructionType_notRetInst: {
                 //precondition: lastInst is not last instruction in asmArr (but it is in canonical basic block)
                 //note : asmArr[x.end] expected to be .L*:(name of a basic block)
                 //       this .L*: has to be exactly after the last instruction in the current canocial basic block
                 if (asmArr[x.end]) {
                     targetNode = asmArr[x.end].text;
                     setEdge(edge, x.nameId, targetNode, 'grey');
                     edges.push(_.clone(edge));
                     logger.debug('not ret inst');
                     logger.debug(edge);
                 } else {
                     logger.debug(x);
                 }
             }
                 break;
             case InstructionType_retInst:
                 logger.debug('expect ret instruction or it\'s variants(rep ret): ' + lastInst);
                 break;
         }
     });
     logger.debug(edges);
     return edges;
 };


 ControlFlowGraph.prototype.generateCfgStructure = function (asmArr) {
     var code = this.rules.filterData(asmArr);
     var funcs = this.splitToFunctions(code, this.rules.isFunctionEnd);
     if (!funcs.length) {
         return funcs;
     }
     var result = {};
     _.each(funcs, _.bind(function (rng) {
         var basicBlocks = this.splitToBasicBlocks(code, rng, this.rules.isBasicBlockEnd,
             this.rules.isJmpInstruction);
         var arrOfCanonicalBasicBlock = [];
         _.each(basicBlocks, _.bind(function (elm) {
             var tmp = this.splitToCanonicalBasicBlock(elm);
             arrOfCanonicalBasicBlock = arrOfCanonicalBasicBlock.concat(tmp);
         }, this));

         result[code[rng.start].text] = {
             nodes: this.makeNodes(code, arrOfCanonicalBasicBlock),
             edges: this.makeEdges(code, arrOfCanonicalBasicBlock,
                 this.rules.getInstructionType,
                 this.rules.extractNodeName)
         };
     }, this));

     return result;
 };

 module.exports.ControlFlowGraph = ControlFlowGraph;
	// Copyright (c) 2012-2018, Najjar Chedy
	//
	// All rights reserved.
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//
	// * Redistributions of source code must retain the above copyright notice,
	// this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above copyright
	// notice, this list of conditions and the following disclaimer in the
	// documentation and/or other materials provided with the distribution.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	// POSSIBILITY OF SUCH DAMAGE.
	var _ = require('underscore-node'),
	logger = require('./logger').logger;

	var InstructionType_jmp = 0;
	var InstructionType_conditionalJmpInst = 1;
	var InstructionType_notRetInst = 2;
	var InstructionType_retInst = 3;

	var isFunctionName = function (x) {
	return x.text.trim().indexOf('.') !== 0 &&
	!x.text.includes(' for ');// deal with typeinfo name for, typeinfo for, vtable for
	};

	// this mess is intended to be ported to another file.
	function separateCodeFromData(asmArr) {

	var jmpLabelRegex = /\.L{1}\d+:/;

	var isCode = function (x) {
	return x && x.text && (x.source !== null \|\| jmpLabelRegex.test(x.text) \|\|
	isFunctionName(x));
	};

	return _.chain(asmArr)
	.map(_.clone)
	.filter(isCode)
	.value();
	}

	var gccX86 = {
	filterData: separateCodeFromData,
	isFunctionEnd: function (x) {
	return ((x[0] !== ' ') && (x[0] !== '.') &&
	(x.indexOf(':') !== -1));
	},

	isBasicBlockEnd: function (inst, prevInst) {
	return inst[0] === '.' \|\| prevInst.includes(' ret');
	},

	getInstructionType: function (inst) {
	if (inst.includes('jmp')) return InstructionType_jmp;
	else if (inst.trim()[0] === 'j') return InstructionType_conditionalJmpInst;
	else if (!inst.includes(' ret')) return InstructionType_notRetInst;
	else return InstructionType_retInst;
	},

	extractNodeName: function (inst) {
	var name = inst.match(/\.L{1}\d+/);
	return name + ':';
	},

	isJmpInstruction: function (x) {
	var trimed = x.trim();
	return ( trimed[0] === 'j');
	}
	};

	function separateCodeFromData_(asmArr) {

	var jmpLabelRegex = /\.LBB\d+_\d+:/;

	var isCode = function (x) {
	return x && x.text && (x.source !== null \|\| jmpLabelRegex.test(x.text) \|\|
	isFunctionName(x));
	};

	var removeComments = function (x) {
	var pos = x.text.indexOf('#');
	if (pos !== -1)
	x.text = x.text.substring(0, pos - 1);
	return x;
	};

	return _.chain(asmArr)
	.map(_.clone)
	.filter(isCode)
	.map(removeComments)
	.value();
	}

	var clangX86 = {
	filterData: separateCodeFromData_,
	isFunctionEnd: function (x) {
	return ((x[0] !== ' ') && (x[0] !== '.') &&
	(x.indexOf(':') !== -1));
	},

	isBasicBlockEnd: function (inst, prevInst) {
	return inst[0] === '.' \|\| prevInst.includes(' ret');
	},

	getInstructionType: function (inst) {
	if (inst.includes('jmp')) return InstructionType_jmp;
	else if (inst.trim()[0] === 'j') return InstructionType_conditionalJmpInst;
	else if (!inst.includes(' ret')) return InstructionType_notRetInst;
	else return InstructionType_retInst;
	},

	extractNodeName: function (inst) {
	var name = inst.match(/\.LBB\d+_\d+/);
	return name + ':';
	},

	isJmpInstruction: function (x) {
	var trimed = x.trim();
	return ( trimed[0] === 'j');
	}
	};

	function ControlFlowGraph(compiler) {
	if (compiler.includes('clang'))
	this.rules = clangX86;
	else
	this.rules = gccX86;
	}

	ControlFlowGraph.prototype.splitToFunctions = function (asmArr, isEnd) {
	if (asmArr.length === 0) return [];
	var result = [];
	var first = 1;
	var last = asmArr.length;
	var fnRange = {start: 0, end: null};
	while (first !== last) {
	if (isEnd(asmArr[first].text)) {
	fnRange.end = first;
	result.push(_.clone(fnRange));
	fnRange.start = first;
	}
	++first;
	}

	fnRange.end = last;
	result.push(_.clone(fnRange));
	return result;
	};

	ControlFlowGraph.prototype.splitToBasicBlocks = function (asmArr, range, isEnd, isJmp) {
	var first = range.start;
	var last = range.end;
	if (first === last) return [];
	var functionName = asmArr[first].text;
	++first;

	var rangeBb = {nameId: functionName.substr(0, 50), start: first, end: null, actionPos: []};
	var result = [];

	var newRangeWith = function (oldRange, nameId, start) {
	return {nameId: nameId, start: start, actionPos: [], end: oldRange.end};
	};

	while (first < last) {
	var inst = asmArr[first].text;
	if (isEnd(inst, asmArr[first - 1] ? asmArr[first - 1].text : '')) {
	rangeBb.end = first;
	result.push(_.clone(rangeBb));
	//inst is expected to be .L: where in 1,2,...
	rangeBb = newRangeWith(rangeBb, inst, first + 1);
	}
	else if (isJmp(inst)) {
	rangeBb.actionPos.push(first);
	}
	++first;
	}

	rangeBb.end = last;
	result.push(_.clone(rangeBb));
	return result;
	};

	ControlFlowGraph.prototype.splitToCanonicalBasicBlock = function (basicBlock) {
	var actionPos = basicBlock.actionPos;
	var actPosSz = actionPos.length;
	if (actionPos[actPosSz - 1] + 1 === basicBlock.end) {
	--actPosSz;
	}

	if (actPosSz === 0)
	return [{
	nameId: basicBlock.nameId,
	start: basicBlock.start,
	end: basicBlock.end
	}];
	else if (actPosSz === 1)
	return [
	{nameId: basicBlock.nameId, start: basicBlock.start, end: actionPos[0] + 1},
	{nameId: basicBlock.nameId + '@' + (actionPos[0] + 1), start: actionPos[0] + 1, end: basicBlock.end}
	];
	else {
	var first = 0;
	var last = actPosSz;
	var blockName = basicBlock.nameId;
	var tmp = {nameId: blockName, start: basicBlock.start, end: actionPos[first] + 1};
	var result = [];
	result.push(_.clone(tmp));
	while (first !== last - 1) {
	tmp.nameId = blockName + '@' + (actionPos[first] + 1);
	tmp.start = actionPos[first] + 1;
	++first;
	tmp.end = actionPos[first] + 1;
	result.push(_.clone(tmp));
	}

	tmp = {nameId: blockName + '@' + (actionPos[first] + 1), start: actionPos[first] + 1, end: basicBlock.end};
	result.push(_.clone(tmp));

	return result;

	}

	};

	ControlFlowGraph.prototype.concatInstructions = function (asmArr, first, last) {
	return _.chain(asmArr.slice(first, last))
	.map(function (x) {
	return x.text.substr(0, 50);
	})
	.value()
	.join('\n');
	};

	ControlFlowGraph.prototype.makeNodes = function (asmArr, arrOfCanonicalBasicBlock) {
	var node = {};
	var nodes = [];

	_.each(arrOfCanonicalBasicBlock, _.bind(function (elm) {
	logger.debug('node name:');
	logger.debug(elm.nameId);
	node.id = elm.nameId;
	node.label = elm.nameId + ((elm.nameId.indexOf(':') !== -1) ? '' : ':') + '\n' +
	this.concatInstructions(asmArr, elm.start, elm.end);
	node.color = '#99ccff';
	node.shape = 'box';
	nodes.push(_.clone(node));
	}, this));
	return nodes;
	};

	ControlFlowGraph.prototype.makeEdges = function (asmArr, arrOfCanonicalBasicBlock, instructionType, extractNodeNameFromInstruction) {
	var edge = {};
	var edges = [];

	var setEdge = function (edge, sourceNode, targetNode, color) {
	edge.from = sourceNode;
	edge.to = targetNode;
	edge.arrows = 'to';
	edge.color = color;
	};
	var isBasicBlockEnd = this.rules.isBasicBlockEnd;

	var hasName = function (asmArr, cbb) {
	var asm = asmArr[cbb.end];
	return asm ? isBasicBlockEnd(asm.text, '') : false;
	};

	var generateName = function (name, suffix) {
	var pos = name.indexOf('@');
	if (pos === -1)
	return name + '@' + suffix;

	return name.substring(0, pos + 1) + suffix;
	};

	// note: x.end-1 possible value: jmp .L, {jne,je,jg,...} .L, ret/rep ret, call and any other instruction that doesn't change control flow

	_.each(arrOfCanonicalBasicBlock, function (x) {
	var targetNode;
	var lastInst = asmArr[x.end - 1].text;
	switch (instructionType(lastInst)) {
	case InstructionType_jmp: {

	//we have to deal only with jmp destination, jmp instruction are always taken.
	//edge from jump inst
	logger.debug('jmp');
	targetNode = extractNodeNameFromInstruction(lastInst);
	setEdge(edge, x.nameId, targetNode, 'blue');

	edges.push(_.clone(edge));
	logger.debug(edge);
	}
	break;
	case InstructionType_conditionalJmpInst: {
	logger.debug('condit jmp');
	//deal with : branch taken, branch not taken
	targetNode = extractNodeNameFromInstruction(lastInst);
	setEdge(edge, x.nameId, targetNode, 'green');
	edges.push(_.clone(edge));
	logger.debug(edge);

	targetNode = hasName(asmArr, x) ? asmArr[x.end].text : generateName(x.nameId, x.end);
	setEdge(edge, x.nameId, targetNode, 'red');
	edges.push(_.clone(edge));

	logger.debug(edge);
	}
	break;
	case InstructionType_notRetInst: {
	//precondition: lastInst is not last instruction in asmArr (but it is in canonical basic block)
	//note : asmArr[x.end] expected to be .L*:(name of a basic block)
	// this .L*: has to be exactly after the last instruction in the current canocial basic block
	if (asmArr[x.end]) {
	targetNode = asmArr[x.end].text;
	setEdge(edge, x.nameId, targetNode, 'grey');
	edges.push(_.clone(edge));
	logger.debug('not ret inst');
	logger.debug(edge);
	} else {
	logger.debug(x);
	}
	}
	break;
	case InstructionType_retInst:
	logger.debug('expect ret instruction or it\'s variants(rep ret): ' + lastInst);
	break;
	}
	});
	logger.debug(edges);
	return edges;
	};


	ControlFlowGraph.prototype.generateCfgStructure = function (asmArr) {
	var code = this.rules.filterData(asmArr);
	var funcs = this.splitToFunctions(code, this.rules.isFunctionEnd);
	if (!funcs.length) {
	return funcs;
	}
	var result = {};
	_.each(funcs, _.bind(function (rng) {
	var basicBlocks = this.splitToBasicBlocks(code, rng, this.rules.isBasicBlockEnd,
	this.rules.isJmpInstruction);
	var arrOfCanonicalBasicBlock = [];
	_.each(basicBlocks, _.bind(function (elm) {
	var tmp = this.splitToCanonicalBasicBlock(elm);
	arrOfCanonicalBasicBlock = arrOfCanonicalBasicBlock.concat(tmp);
	}, this));

	result[code[rng.start].text] = {
	nodes: this.makeNodes(code, arrOfCanonicalBasicBlock),
	edges: this.makeEdges(code, arrOfCanonicalBasicBlock,
	this.rules.getInstructionType,
	this.rules.extractNodeName)
	};
	}, this));

	return result;
	};

	module.exports.ControlFlowGraph = ControlFlowGraph;