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//===- Pass.cpp - LLVM Pass Infrastructure Impementation ------------------===//
//
// This file implements the LLVM Pass infrastructure. It is primarily
// responsible with ensuring that passes are executed and batched together
// optimally.
//
//===----------------------------------------------------------------------===//
#include "llvm/Pass.h"
#include "Support/STLExtras.h"
#include <algorithm>
// Pass debugging information. Often it is useful to find out what pass is
// running when a crash occurs in a utility. When this library is compiled with
// debugging on, a command line option (--debug-pass) is enabled that causes the
// pass name to be printed before it executes.
//
#ifdef NDEBUG
// If not debugging, remove the option
inline static void PrintPassInformation(const char *, Pass *, Value *) { }
#else
#include "Support/CommandLine.h"
#include <typeinfo>
#include <iostream>
// The option is hidden from --help by default
static cl::Flag PassDebugEnabled("debug-pass",
"Print pass names as they are executed by the PassManager", cl::Hidden);
static void PrintPassInformation(const char *Action, Pass *P, Value *V) {
if (PassDebugEnabled)
std::cerr << Action << " Pass '" << typeid(*P).name() << "' on "
<< typeid(*V).name() << " '" << V->getName() << "'...\n";
}
#endif
PassManager::~PassManager() {
for_each(Passes.begin(), Passes.end(), deleter<Pass>);
}
class BasicBlockPassBatcher : public MethodPass {
typedef std::vector<BasicBlockPass*> SubPassesType;
SubPassesType SubPasses;
public:
~BasicBlockPassBatcher() {
for_each(SubPasses.begin(), SubPasses.end(), deleter<BasicBlockPass>);
}
void add(BasicBlockPass *P) { SubPasses.push_back(P); }
virtual bool doInitialization(Module *M) {
bool Changed = false;
for (SubPassesType::iterator I = SubPasses.begin(), E = SubPasses.end();
I != E; ++I) {
PrintPassInformation("Initializing", *I, M);
Changed |= (*I)->doInitialization(M);
}
return Changed;
}
virtual bool runOnMethod(Method *M) {
bool Changed = false;
for (Method::iterator MI = M->begin(), ME = M->end(); MI != ME; ++MI)
for (SubPassesType::iterator I = SubPasses.begin(), E = SubPasses.end();
I != E; ++I) {
PrintPassInformation("Executing", *I, *MI);
Changed |= (*I)->runOnBasicBlock(*MI);
}
return Changed;
}
virtual bool doFinalization(Module *M) {
bool Changed = false;
for (SubPassesType::iterator I = SubPasses.begin(), E = SubPasses.end();
I != E; ++I) {
PrintPassInformation("Finalizing", *I, M);
Changed |= (*I)->doFinalization(M);
}
return Changed;
}
};
class MethodPassBatcher : public Pass {
typedef std::vector<MethodPass*> SubPassesType;
SubPassesType SubPasses;
BasicBlockPassBatcher *BBPBatcher;
public:
inline MethodPassBatcher() : BBPBatcher(0) {}
inline ~MethodPassBatcher() {
for_each(SubPasses.begin(), SubPasses.end(), deleter<MethodPass>);
}
void add(BasicBlockPass *BBP) {
if (BBPBatcher == 0) {
BBPBatcher = new BasicBlockPassBatcher();
SubPasses.push_back(BBPBatcher);
}
BBPBatcher->add(BBP);
}
void add(MethodPass *P) {
if (BasicBlockPass *BBP = dynamic_cast<BasicBlockPass*>(P)) {
add(BBP);
} else {
BBPBatcher = 0; // Ensure that passes don't get accidentally reordered
SubPasses.push_back(P);
}
}
virtual bool run(Module *M) {
bool Changed = false;
for (SubPassesType::iterator I = SubPasses.begin(), E = SubPasses.end();
I != E; ++I) {
PrintPassInformation("Initializing", *I, M);
Changed |= (*I)->doInitialization(M);
}
for (Module::iterator MI = M->begin(), ME = M->end(); MI != ME; ++MI)
for (SubPassesType::iterator I = SubPasses.begin(), E = SubPasses.end();
I != E; ++I) {
PrintPassInformation("Executing", *I, M);
Changed |= (*I)->runOnMethod(*MI);
}
for (SubPassesType::iterator I = SubPasses.begin(), E = SubPasses.end();
I != E; ++I) {
PrintPassInformation("Finalizing", *I, M);
Changed |= (*I)->doFinalization(M);
}
return Changed;
}
};
// add(BasicBlockPass*) - If we know it's a BasicBlockPass, we don't have to do
// any checking...
//
void PassManager::add(BasicBlockPass *BBP) {
if (Batcher == 0) // If we don't have a batcher yet, make one now.
add((MethodPass*)BBP);
else
Batcher->add(BBP);
}
// add(MethodPass*) - MethodPass's must be batched together... make sure this
// happens now.
//
void PassManager::add(MethodPass *MP) {
if (Batcher == 0) { // If we don't have a batcher yet, make one now.
Batcher = new MethodPassBatcher();
Passes.push_back(Batcher);
}
Batcher->add(MP); // The Batcher will queue them passes up
}
// add - Add a pass to the PassManager, batching it up as appropriate...
void PassManager::add(Pass *P) {
if (MethodPass *MP = dynamic_cast<MethodPass*>(P)) {
add(MP); // Use the methodpass specific code to do the addition
} else {
Batcher = 0; // Ensure that passes don't get accidentally reordered
Passes.push_back(P);
}
}
bool PassManager::run(Module *M) {
bool MadeChanges = false;
// Run all of the pass initializers
for (unsigned i = 0, e = Passes.size(); i < e; ++i) {
PrintPassInformation("Executing", Passes[i], M);
MadeChanges |= Passes[i]->run(M);
}
return MadeChanges;
}
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