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8245e5bde1
Shrinkify LLVM's footprint by removing the analyze tool and moving its functionality into the opt tool. THis eliminates one of the largest tools from LLVM and doesn't make opt much bigger because it already included most of the analysis passes. To get the old analyze functionality pass the -analyze option to opt. Note that the integeration here is dead simple. The "main" of analyze was just copied to opt and invoked if the -analyze option was given. There may be opportunities for further integration such as removing the distinction between transform passes and analysis passes. To use the analysis functionality, if you previously did this: analyze $FNAME -domset -disable-verify you would now do this: opt -analyze $FNAME -domset -disable-verify Pretty simple. llvm-svn: 29762
106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
//===- PrintSCC.cpp - Enumerate SCCs in some key graphs -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides passes to print out SCCs in a CFG or a CallGraph.
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// Normally, you would not use these passes; instead, you would use the
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// scc_iterator directly to enumerate SCCs and process them in some way. These
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// passes serve three purposes:
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//
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// (1) As a reference for how to use the scc_iterator.
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// (2) To print out the SCCs for a CFG or a CallGraph:
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// analyze -cfgscc to print the SCCs in each CFG of a module.
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// analyze -cfgscc -stats to print the #SCCs and the maximum SCC size.
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// analyze -cfgscc -debug > /dev/null to watch the algorithm in action.
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//
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// and similarly:
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// analyze -callscc [-stats] [-debug] to print SCCs in the CallGraph
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//
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// (3) To test the scc_iterator.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Pass.h"
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#include "llvm/Module.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/ADT/SCCIterator.h"
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#include <iostream>
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using namespace llvm;
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namespace {
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struct CFGSCC : public FunctionPass {
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bool runOnFunction(Function& func);
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void print(std::ostream &O, 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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struct CallGraphSCC : public ModulePass {
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// run - Print out SCCs in the call graph for the specified module.
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bool runOnModule(Module &M);
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void print(std::ostream &O, const Module* = 0) const { }
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// getAnalysisUsage - This pass requires the CallGraph.
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<CallGraph>();
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}
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};
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RegisterAnalysis<CFGSCC>
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Y("cfgscc", "Print SCCs of each function CFG");
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RegisterAnalysis<CallGraphSCC>
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Z("callscc", "Print SCCs of the Call Graph");
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}
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bool CFGSCC::runOnFunction(Function &F) {
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unsigned sccNum = 0;
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std::cout << "SCCs for Function " << F.getName() << " in PostOrder:";
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for (scc_iterator<Function*> SCCI = scc_begin(&F),
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E = scc_end(&F); SCCI != E; ++SCCI) {
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std::vector<BasicBlock*> &nextSCC = *SCCI;
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std::cout << "\nSCC #" << ++sccNum << " : ";
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for (std::vector<BasicBlock*>::const_iterator I = nextSCC.begin(),
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E = nextSCC.end(); I != E; ++I)
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std::cout << (*I)->getName() << ", ";
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if (nextSCC.size() == 1 && SCCI.hasLoop())
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std::cout << " (Has self-loop).";
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}
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std::cout << "\n";
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return true;
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}
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// run - Print out SCCs in the call graph for the specified module.
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bool CallGraphSCC::runOnModule(Module &M) {
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CallGraphNode* rootNode = getAnalysis<CallGraph>().getRoot();
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unsigned sccNum = 0;
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std::cout << "SCCs for the program in PostOrder:";
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for (scc_iterator<CallGraphNode*> SCCI = scc_begin(rootNode),
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E = scc_end(rootNode); SCCI != E; ++SCCI) {
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const std::vector<CallGraphNode*> &nextSCC = *SCCI;
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std::cout << "\nSCC #" << ++sccNum << " : ";
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for (std::vector<CallGraphNode*>::const_iterator I = nextSCC.begin(),
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E = nextSCC.end(); I != E; ++I)
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std::cout << ((*I)->getFunction() ? (*I)->getFunction()->getName()
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: std::string("Indirect CallGraph node")) << ", ";
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if (nextSCC.size() == 1 && SCCI.hasLoop())
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std::cout << " (Has self-loop).";
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}
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std::cout << "\n";
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return true;
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}
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