161 lines
4.7 KiB
C++
161 lines
4.7 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/Analysis/CFGPrinter.h"
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#include "llvm/Pass.h"
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using namespace llvm;
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namespace {
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struct 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(raw_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 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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F.viewCFGOnly();
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return false;
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}
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void print(raw_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 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.getNameStr() + ".dot";
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errs() << "Writing '" << Filename << "'...";
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std::string ErrorInfo;
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raw_fd_ostream File(Filename.c_str(), ErrorInfo);
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if (ErrorInfo.empty())
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WriteGraph(File, (const Function*)&F);
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else
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errs() << " error opening file for writing!";
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errs() << "\n";
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return false;
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}
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void print(raw_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 CFGOnlyPrinter : public FunctionPass {
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static char ID; // Pass identification, replacement for typeid
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CFGOnlyPrinter() : FunctionPass(&ID) {}
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explicit CFGOnlyPrinter(void *pid) : FunctionPass(pid) {}
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virtual bool runOnFunction(Function &F) {
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std::string Filename = "cfg." + F.getNameStr() + ".dot";
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errs() << "Writing '" << Filename << "'...";
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std::string ErrorInfo;
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raw_fd_ostream File(Filename.c_str(), ErrorInfo);
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if (ErrorInfo.empty())
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WriteGraph(File, (const Function*)&F, true);
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else
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errs() << " error opening file for writing!";
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errs() << "\n";
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return false;
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}
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void print(raw_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" + getNameStr());
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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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ViewGraph(this, "cfg" + getNameStr(), true);
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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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