Check in LLVM r95781.
diff --git a/lib/Analysis/CFGPrinter.cpp b/lib/Analysis/CFGPrinter.cpp
new file mode 100644
index 0000000..e06704b
--- /dev/null
+++ b/lib/Analysis/CFGPrinter.cpp
@@ -0,0 +1,160 @@
+//===- 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) {}
+
+ 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;
+static RegisterPass<CFGViewer>
+V0("view-cfg", "View CFG of function", false, true);
+
+namespace {
+ struct CFGOnlyViewer : public FunctionPass {
+ static char ID; // Pass identifcation, replacement for typeid
+ CFGOnlyViewer() : FunctionPass(&ID) {}
+
+ 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;
+static RegisterPass<CFGOnlyViewer>
+V1("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) {}
+ explicit CFGPrinter(void *pid) : FunctionPass(pid) {}
+
+ virtual bool runOnFunction(Function &F) {
+ std::string Filename = "cfg." + F.getNameStr() + ".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;
+static RegisterPass<CFGPrinter>
+P1("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) {}
+ explicit CFGOnlyPrinter(void *pid) : FunctionPass(pid) {}
+ virtual bool runOnFunction(Function &F) {
+ std::string Filename = "cfg." + F.getNameStr() + ".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;
+static RegisterPass<CFGOnlyPrinter>
+P2("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" + getNameStr());
+}
+
+/// 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" + getNameStr(), true);
+}
+
+FunctionPass *llvm::createCFGPrinterPass () {
+ return new CFGPrinter();
+}
+
+FunctionPass *llvm::createCFGOnlyPrinterPass () {
+ return new CFGOnlyPrinter();
+}
+