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-callgraph => print-callgraph -callscc => print-callgraph-sccs -cfgscc => print-cfg-sccs -externalfnconstants => print-externalfnconstants -print => print-function -print-alias-sets (no change) -print-callgraph => dot-callgraph -print-cfg => dot-cfg -print-cfg-only => dot-cfg-only -print-dom-info (no change) -printm => print-module -printusedtypes => print-used-types git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56487 91177308-0d34-0410-b5e6-96231b3b80d8
222 lines
6.5 KiB
C++
222 lines
6.5 KiB
C++
//===- CFGPrinter.cpp - DOT printer for the control flow graph ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a '-dot-cfg' analysis pass, which emits the
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// cfg.<fnname>.dot file for each function in the program, with a graph of the
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// CFG for that function.
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//
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// The other main feature of this file is that it implements the
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// Function::viewCFG method, which is useful for debugging passes which operate
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// on the CFG.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/Pass.h"
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#include "llvm/Analysis/CFGPrinter.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Config/config.h"
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#include <iosfwd>
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#include <sstream>
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#include <fstream>
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using namespace llvm;
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/// CFGOnly flag - This is used to control whether or not the CFG graph printer
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/// prints out the contents of basic blocks or not. This is acceptable because
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/// this code is only really used for debugging purposes.
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///
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static bool CFGOnly = false;
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namespace llvm {
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template<>
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struct DOTGraphTraits<const Function*> : public DefaultDOTGraphTraits {
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static std::string getGraphName(const Function *F) {
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return "CFG for '" + F->getName() + "' function";
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}
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static std::string getNodeLabel(const BasicBlock *Node,
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const Function *Graph) {
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if (CFGOnly && !Node->getName().empty())
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return Node->getName() + ":";
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std::ostringstream Out;
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if (CFGOnly) {
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WriteAsOperand(Out, Node, false);
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return Out.str();
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}
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if (Node->getName().empty()) {
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WriteAsOperand(Out, Node, false);
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Out << ":";
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}
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Out << *Node;
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std::string OutStr = Out.str();
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if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
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// Process string output to make it nicer...
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for (unsigned i = 0; i != OutStr.length(); ++i)
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if (OutStr[i] == '\n') { // Left justify
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OutStr[i] = '\\';
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OutStr.insert(OutStr.begin()+i+1, 'l');
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} else if (OutStr[i] == ';') { // Delete comments!
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unsigned Idx = OutStr.find('\n', i+1); // Find end of line
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OutStr.erase(OutStr.begin()+i, OutStr.begin()+Idx);
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--i;
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}
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return OutStr;
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}
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static std::string getEdgeSourceLabel(const BasicBlock *Node,
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succ_const_iterator I) {
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// Label source of conditional branches with "T" or "F"
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if (const BranchInst *BI = dyn_cast<BranchInst>(Node->getTerminator()))
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if (BI->isConditional())
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return (I == succ_begin(Node)) ? "T" : "F";
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return "";
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}
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};
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}
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namespace {
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struct VISIBILITY_HIDDEN CFGViewer : public FunctionPass {
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static char ID; // Pass identifcation, replacement for typeid
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CFGViewer() : FunctionPass(&ID) {}
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virtual bool runOnFunction(Function &F) {
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F.viewCFG();
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return false;
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}
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void print(std::ostream &OS, const Module* = 0) const {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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};
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}
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char CFGViewer::ID = 0;
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static RegisterPass<CFGViewer>
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V0("view-cfg", "View CFG of function", false, true);
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namespace {
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struct VISIBILITY_HIDDEN CFGOnlyViewer : public FunctionPass {
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static char ID; // Pass identifcation, replacement for typeid
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CFGOnlyViewer() : FunctionPass(&ID) {}
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virtual bool runOnFunction(Function &F) {
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CFGOnly = true;
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F.viewCFG();
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CFGOnly = false;
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return false;
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}
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void print(std::ostream &OS, const Module* = 0) const {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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};
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}
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char CFGOnlyViewer::ID = 0;
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static RegisterPass<CFGOnlyViewer>
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V1("view-cfg-only",
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"View CFG of function (with no function bodies)", false, true);
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namespace {
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struct VISIBILITY_HIDDEN CFGPrinter : public FunctionPass {
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static char ID; // Pass identification, replacement for typeid
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CFGPrinter() : FunctionPass(&ID) {}
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explicit CFGPrinter(void *pid) : FunctionPass(pid) {}
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virtual bool runOnFunction(Function &F) {
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std::string Filename = "cfg." + F.getName() + ".dot";
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cerr << "Writing '" << Filename << "'...";
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std::ofstream File(Filename.c_str());
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if (File.good())
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WriteGraph(File, (const Function*)&F);
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else
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cerr << " error opening file for writing!";
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cerr << "\n";
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return false;
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}
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void print(std::ostream &OS, const Module* = 0) const {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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};
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}
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char CFGPrinter::ID = 0;
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static RegisterPass<CFGPrinter>
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P1("dot-cfg", "Print CFG of function to 'dot' file", false, true);
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namespace {
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struct VISIBILITY_HIDDEN CFGOnlyPrinter : public CFGPrinter {
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static char ID; // Pass identification, replacement for typeid
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CFGOnlyPrinter() : CFGPrinter(&ID) {}
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virtual bool runOnFunction(Function &F) {
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bool OldCFGOnly = CFGOnly;
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CFGOnly = true;
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CFGPrinter::runOnFunction(F);
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CFGOnly = OldCFGOnly;
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return false;
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}
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void print(std::ostream &OS, const Module* = 0) const {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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};
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}
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char CFGOnlyPrinter::ID = 0;
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static RegisterPass<CFGOnlyPrinter>
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P2("dot-cfg-only",
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"Print CFG of function to 'dot' file (with no function bodies)", false, true);
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/// viewCFG - This function is meant for use from the debugger. You can just
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/// say 'call F->viewCFG()' and a ghostview window should pop up from the
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/// program, displaying the CFG of the current function. This depends on there
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/// being a 'dot' and 'gv' program in your path.
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///
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void Function::viewCFG() const {
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ViewGraph(this, "cfg" + getName());
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}
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/// viewCFGOnly - This function is meant for use from the debugger. It works
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/// just like viewCFG, but it does not include the contents of basic blocks
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/// into the nodes, just the label. If you are only interested in the CFG t
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/// his can make the graph smaller.
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///
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void Function::viewCFGOnly() const {
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CFGOnly = true;
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viewCFG();
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CFGOnly = false;
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}
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FunctionPass *llvm::createCFGPrinterPass () {
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return new CFGPrinter();
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}
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FunctionPass *llvm::createCFGOnlyPrinterPass () {
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return new CFGOnlyPrinter();
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}
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