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//===- CFGPrinter.cpp - DOT printer for the control flow graph ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a '-dot-cfg' analysis pass, which emits the
// cfg.<fnname>.dot file for each function in the program, with a graph of the
// CFG for that function.
//
// The other main feature of this file is that it implements the
// Function::viewCFG method, which is useful for debugging passes which operate
// on the CFG.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/CFGPrinter.h"
#include "llvm/Pass.h"
using namespace llvm;
namespace {
struct CFGViewer : public FunctionPass {
static char ID; // Pass identifcation, replacement for typeid
CFGViewer() : FunctionPass(ID) {
initializeCFGOnlyViewerPass(*PassRegistry::getPassRegistry());
}
virtual bool runOnFunction(Function &F) {
F.viewCFG();
return false;
}
void print(raw_ostream &OS, const Module* = 0) const {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
}
char CFGViewer::ID = 0;
INITIALIZE_PASS(CFGViewer, "view-cfg", "View CFG of function", false, true)
namespace {
struct CFGOnlyViewer : public FunctionPass {
static char ID; // Pass identifcation, replacement for typeid
CFGOnlyViewer() : FunctionPass(ID) {
initializeCFGOnlyViewerPass(*PassRegistry::getPassRegistry());
}
virtual bool runOnFunction(Function &F) {
F.viewCFGOnly();
return false;
}
void print(raw_ostream &OS, const Module* = 0) const {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
}
char CFGOnlyViewer::ID = 0;
INITIALIZE_PASS(CFGOnlyViewer, "view-cfg-only",
"View CFG of function (with no function bodies)", false, true)
namespace {
struct CFGPrinter : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
CFGPrinter() : FunctionPass(ID) {
initializeCFGPrinterPass(*PassRegistry::getPassRegistry());
}
virtual bool runOnFunction(Function &F) {
std::string Filename = "cfg." + F.getName().str() + ".dot";
errs() << "Writing '" << Filename << "'...";
std::string ErrorInfo;
raw_fd_ostream File(Filename.c_str(), ErrorInfo);
if (ErrorInfo.empty())
WriteGraph(File, (const Function*)&F);
else
errs() << " error opening file for writing!";
errs() << "\n";
return false;
}
void print(raw_ostream &OS, const Module* = 0) const {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
}
char CFGPrinter::ID = 0;
INITIALIZE_PASS(CFGPrinter, "dot-cfg", "Print CFG of function to 'dot' file",
false, true)
namespace {
struct CFGOnlyPrinter : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
CFGOnlyPrinter() : FunctionPass(ID) {
initializeCFGOnlyPrinterPass(*PassRegistry::getPassRegistry());
}
virtual bool runOnFunction(Function &F) {
std::string Filename = "cfg." + F.getName().str() + ".dot";
errs() << "Writing '" << Filename << "'...";
std::string ErrorInfo;
raw_fd_ostream File(Filename.c_str(), ErrorInfo);
if (ErrorInfo.empty())
WriteGraph(File, (const Function*)&F, true);
else
errs() << " error opening file for writing!";
errs() << "\n";
return false;
}
void print(raw_ostream &OS, const Module* = 0) const {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
}
char CFGOnlyPrinter::ID = 0;
INITIALIZE_PASS(CFGOnlyPrinter, "dot-cfg-only",
"Print CFG of function to 'dot' file (with no function bodies)",
false, true)
/// viewCFG - This function is meant for use from the debugger. You can just
/// say 'call F->viewCFG()' and a ghostview window should pop up from the
/// program, displaying the CFG of the current function. This depends on there
/// being a 'dot' and 'gv' program in your path.
///
void Function::viewCFG() const {
ViewGraph(this, "cfg" + getName());
}
/// viewCFGOnly - This function is meant for use from the debugger. It works
/// just like viewCFG, but it does not include the contents of basic blocks
/// into the nodes, just the label. If you are only interested in the CFG t
/// his can make the graph smaller.
///
void Function::viewCFGOnly() const {
ViewGraph(this, "cfg" + getName(), true);
}
FunctionPass *llvm::createCFGPrinterPass () {
return new CFGPrinter();
}
FunctionPass *llvm::createCFGOnlyPrinterPass () {
return new CFGOnlyPrinter();
}
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