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llvm-mirror/tools/analyze/AnalysisWrappers.cpp
2004-07-04 12:20:55 +00:00

87 lines
3.0 KiB
C++

//===- AnalysisWrappers.cpp - Wrappers around non-pass analyses -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines pass wrappers around LLVM analyses that don't make sense to
// be passes. It provides a nice standard pass interface to these classes so
// that they can be printed out by analyze.
//
// These classes are separated out of analyze.cpp so that it is more clear which
// code is the integral part of the analyze tool, and which part of the code is
// just making it so more passes are available.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/InstForest.h"
#include "llvm/Support/CallSite.h"
#include <iostream>
using namespace llvm;
namespace {
struct InstForestHelper : public FunctionPass {
Function *F;
virtual bool runOnFunction(Function &Func) { F = &Func; return false; }
void print(std::ostream &OS) const {
std::cout << InstForest<char>(F);
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
RegisterAnalysis<InstForestHelper> P1("instforest", "InstForest Printer");
}
namespace {
/// ExternalFunctionsPassedConstants - This pass prints out call sites to
/// external functions that are called with constant arguments. This can be
/// useful when looking for standard library functions we should constant fold
/// or handle in alias analyses.
struct ExternalFunctionsPassedConstants : public Pass {
virtual bool run(Module &M) {
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->isExternal()) {
bool PrintedFn = false;
for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
UI != E; ++UI)
if (Instruction *User = dyn_cast<Instruction>(*UI)) {
CallSite CS = CallSite::get(User);
if (CS.getInstruction()) {
for (CallSite::arg_iterator AI = CS.arg_begin(),
E = CS.arg_end(); AI != E; ++AI)
if (isa<Constant>(*AI) || isa<GlobalValue>(*AI)) {
if (!PrintedFn) {
std::cerr << "Function '" << I->getName() << "':\n";
PrintedFn = true;
}
std::cerr << *User;
break;
}
}
}
}
return false;
}
void print(std::ostream &OS) const {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
RegisterAnalysis<ExternalFunctionsPassedConstants>
P2("externalfnconstants", "Print external fn callsites passed constants");
}