#include "llvm/Analysis/LoopPass.h"
#include "llvm/IR/IRPrintingPasses.h"
+#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Timer.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
+#define DEBUG_TYPE "loop-pass-manager"
+
namespace {
/// PrintLoopPass - Print a Function corresponding to a Loop.
PrintLoopPass(const std::string &B, raw_ostream &o)
: LoopPass(ID), Banner(B), Out(o) {}
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
}
- bool runOnLoop(Loop *L, LPPassManager &) {
+ bool runOnLoop(Loop *L, LPPassManager &) override {
Out << Banner;
for (Loop::block_iterator b = L->block_begin(), be = L->block_end();
b != be;
++b) {
- (*b)->print(Out);
+ if (*b)
+ (*b)->print(Out);
+ else
+ Out << "Printing <null> block";
}
return false;
}
LPPassManager::LPPassManager()
: FunctionPass(ID), PMDataManager() {
skipThisLoop = false;
- redoThisLoop = false;
- LI = NULL;
- CurrentLoop = NULL;
+ LI = nullptr;
+ CurrentLoop = nullptr;
}
/// Delete loop from the loop queue and loop hierarchy (LoopInfo).
LI->updateUnloop(L);
+ // Notify passes that the loop is being deleted.
+ deleteSimpleAnalysisLoop(L);
+
// If L is current loop then skip rest of the passes and let
// runOnFunction remove L from LQ. Otherwise, remove L from LQ now
// and continue applying other passes on CurrentLoop.
}
// Inset loop into loop nest (LoopInfo) and loop queue (LQ).
-void LPPassManager::insertLoop(Loop *L, Loop *ParentLoop) {
-
- assert (CurrentLoop != L && "Cannot insert CurrentLoop");
+Loop &LPPassManager::addLoop(Loop *ParentLoop) {
+ // Create a new loop. LI will take ownership.
+ Loop *L = new Loop();
- // Insert into loop nest
- if (ParentLoop)
- ParentLoop->addChildLoop(L);
- else
+ // Insert into the loop nest and the loop queue.
+ if (!ParentLoop) {
+ // This is the top level loop.
LI->addTopLevelLoop(L);
-
- insertLoopIntoQueue(L);
-}
-
-void LPPassManager::insertLoopIntoQueue(Loop *L) {
- // Insert L into loop queue
- if (L == CurrentLoop)
- redoLoop(L);
- else if (!L->getParentLoop())
- // This is top level loop.
LQ.push_front(L);
- else {
- // Insert L after the parent loop.
- for (std::deque<Loop *>::iterator I = LQ.begin(),
- E = LQ.end(); I != E; ++I) {
- if (*I == L->getParentLoop()) {
- // deque does not support insert after.
- ++I;
- LQ.insert(I, 1, L);
- break;
- }
- }
+ return *L;
}
-}
-// Reoptimize this loop. LPPassManager will re-insert this loop into the
-// queue. This allows LoopPass to change loop nest for the loop. This
-// utility may send LPPassManager into infinite loops so use caution.
-void LPPassManager::redoLoop(Loop *L) {
- assert (CurrentLoop == L && "Can redo only CurrentLoop");
- redoThisLoop = true;
+ ParentLoop->addChildLoop(L);
+ // Insert L into the loop queue after the parent loop.
+ for (auto I = LQ.begin(), E = LQ.end(); I != E; ++I) {
+ if (*I == L->getParentLoop()) {
+ // deque does not support insert after.
+ ++I;
+ LQ.insert(I, 1, L);
+ break;
+ }
+ }
+ return *L;
}
/// cloneBasicBlockSimpleAnalysis - Invoke cloneBasicBlockAnalysis hook for
}
}
+/// Invoke deleteAnalysisLoop hook for all passes.
+void LPPassManager::deleteSimpleAnalysisLoop(Loop *L) {
+ for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
+ LoopPass *LP = getContainedPass(Index);
+ LP->deleteAnalysisLoop(L);
+ }
+}
+
// Recurse through all subloops and all loops into LQ.
static void addLoopIntoQueue(Loop *L, std::deque<Loop *> &LQ) {
void LPPassManager::getAnalysisUsage(AnalysisUsage &Info) const {
// LPPassManager needs LoopInfo. In the long term LoopInfo class will
// become part of LPPassManager.
- Info.addRequired<LoopInfo>();
+ Info.addRequired<LoopInfoWrapperPass>();
Info.setPreservesAll();
}
/// run - Execute all of the passes scheduled for execution. Keep track of
/// whether any of the passes modifies the function, and if so, return true.
bool LPPassManager::runOnFunction(Function &F) {
- LI = &getAnalysis<LoopInfo>();
+ auto &LIWP = getAnalysis<LoopInfoWrapperPass>();
+ LI = &LIWP.getLoopInfo();
bool Changed = false;
// Collect inherited analysis from Module level pass manager.
CurrentLoop = LQ.back();
skipThisLoop = false;
- redoThisLoop = false;
// Run all passes on the current Loop.
for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
// loop in the function every time. That level of checking can be
// enabled with the -verify-loop-info option.
{
- TimeRegion PassTimer(getPassTimer(LI));
+ TimeRegion PassTimer(getPassTimer(&LIWP));
CurrentLoop->verifyLoop();
}
// Then call the regular verifyAnalysis functions.
verifyPreservedAnalysis(P);
+
+ F.getContext().yield();
}
removeNotPreservedAnalysis(P);
// Pop the loop from queue after running all passes.
LQ.pop_back();
-
- if (redoThisLoop)
- LQ.push_back(CurrentLoop);
}
// Finalization
projects / oota-llvm.git / blobdiff