-//===-- llvm/Support/PasaMangerBuilder.h - Build Standard Pass --*- C++ -*-===//
+//===-- llvm/Support/PassManagerBuilder.h - Build Standard Pass -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
/// Builder.populateFunctionPassManager(FPM);
/// Builder.populateModulePassManager(MPM);
///
+/// In addition to setting up the basic passes, PassManagerBuilder allows
+/// frontends to vend a plugin API, where plugins are allowed to add extensions
+/// to the default pass manager. They do this by specifying where in the pass
+/// pipeline they want to be added, along with a callback function that adds
+/// the pass(es). For example, a plugin that wanted to add a loop optimization
+/// could do something like this:
+///
+/// static void addMyLoopPass(const PMBuilder &Builder, PassManagerBase &PM) {
+/// if (Builder.getOptLevel() > 2 && Builder.getOptSizeLevel() == 0)
+/// PM.add(createMyAwesomePass());
+/// }
+/// ...
+/// Builder.addExtension(PassManagerBuilder::EP_LoopOptimizerEnd,
+/// addMyLoopPass);
+/// ...
class PassManagerBuilder {
- unsigned OptLevel; // 0 = -O0, 1 = -O1, 2 = -O2, 3 = -O3
- unsigned SizeLevel; // 0 = none, 1 = -Os, 2 = -Oz
- TargetLibraryInfo *TLI;
- Pass *InlinerPass;
+public:
+
+ /// Extensions are passed the builder itself (so they can see how it is
+ /// configured) as well as the pass manager to add stuff to.
+ typedef void (*ExtensionFn)(const PassManagerBuilder &Builder,
+ PassManagerBase &PM);
+ enum ExtensionPointTy {
+ /// EP_EarlyAsPossible - This extension point allows adding passes before
+ /// any other transformations, allowing them to see the code as it is coming
+ /// out of the frontend.
+ EP_EarlyAsPossible,
+
+ /// EP_LoopOptimizerEnd - This extension point allows adding loop passes to
+ /// the end of the loop optimizer.
+ EP_LoopOptimizerEnd
+ };
+
+ /// The Optimization Level - Specify the basic optimization level.
+ /// 0 = -O0, 1 = -O1, 2 = -O2, 3 = -O3
+ unsigned OptLevel;
+
+ /// SizeLevel - How much we're optimizing for size.
+ /// 0 = none, 1 = -Os, 2 = -Oz
+ unsigned SizeLevel;
+
+ /// LibraryInfo - Specifies information about the runtime library for the
+ /// optimizer. If this is non-null, it is added to both the function and
+ /// per-module pass pipeline.
+ TargetLibraryInfo *LibraryInfo;
+
+ /// Inliner - Specifies the inliner to use. If this is non-null, it is
+ /// added to the per-module passes.
+ Pass *Inliner;
bool DisableSimplifyLibCalls;
bool DisableUnitAtATime;
bool DisableUnrollLoops;
+
+private:
+ /// ExtensionList - This is list of all of the extensions that are registered.
+ std::vector<std::pair<ExtensionPointTy, ExtensionFn> > Extensions;
+
public:
PassManagerBuilder() {
OptLevel = 2;
SizeLevel = 0;
- TLI = 0;
- InlinerPass = 0;
+ LibraryInfo = 0;
+ Inliner = 0;
DisableSimplifyLibCalls = false;
DisableUnitAtATime = false;
DisableUnrollLoops = false;
}
~PassManagerBuilder() {
- delete TLI;
- delete InlinerPass;
+ delete LibraryInfo;
+ delete Inliner;
}
- /// setOptimizationLevel - Specify the basic optimization level -O0 ... -O3.
- void setOptimizationLevel(unsigned L) { OptLevel = L; }
-
- /// setSizeLevel - Specify the size optimization level: none, -Os, -Oz.
- void setSizeLevel(unsigned L) { SizeLevel = L; }
-
- /// setLibraryInfo - Set information about the runtime library for the
- /// optimizer. If this is specified, it is added to both the function and
- /// per-module pass pipeline.
- void setLibraryInfo(TargetLibraryInfo *LI) { TLI = LI; }
-
- /// setInliner - Specify the inliner to use. If this is specified, it is
- /// added to the per-module passes.
- void setInliner(Pass *P) { InlinerPass = P; }
-
-
- void disableSimplifyLibCalls() { DisableSimplifyLibCalls = true; }
- void disableUnitAtATime() { DisableUnitAtATime = true; }
- void disableUnrollLoops() { DisableUnrollLoops = true; }
+ void addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
+ Extensions.push_back(std::make_pair(Ty, Fn));
+ }
private:
- void addInitialAliasAnalysisPasses(PassManagerBase &PM) {
+ void addExtensionsToPM(ExtensionPointTy ETy, PassManagerBase &PM) const {
+ for (unsigned i = 0, e = Extensions.size(); i != e; ++i)
+ if (Extensions[i].first == ETy)
+ Extensions[i].second(*this, PM);
+ }
+
+ void addInitialAliasAnalysisPasses(PassManagerBase &PM) const {
// Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that
// BasicAliasAnalysis wins if they disagree. This is intended to help
// support "obvious" type-punning idioms.
/// which is expected to be run on each function immediately as it is
/// generated. The idea is to reduce the size of the IR in memory.
void populateFunctionPassManager(FunctionPassManager &FPM) {
- if (OptLevel == 0) return;
-
- // Add TLI if we have some.
- if (TLI) FPM.add(new TargetLibraryInfo(*TLI));
+ addExtensionsToPM(EP_EarlyAsPossible, FPM);
+ // Add LibraryInfo if we have some.
+ if (LibraryInfo) FPM.add(new TargetLibraryInfo(*LibraryInfo));
+
+ if (OptLevel == 0) return;
+
addInitialAliasAnalysisPasses(FPM);
FPM.add(createCFGSimplificationPass());
void populateModulePassManager(PassManagerBase &MPM) {
// If all optimizations are disabled, just run the always-inline pass.
if (OptLevel == 0) {
- if (InlinerPass) {
- MPM.add(InlinerPass);
- InlinerPass = 0;
+ if (Inliner) {
+ MPM.add(Inliner);
+ Inliner = 0;
}
return;
}
- // Add TLI if we have some.
- if (TLI) MPM.add(new TargetLibraryInfo(*TLI));
+ // Add LibraryInfo if we have some.
+ if (LibraryInfo) MPM.add(new TargetLibraryInfo(*LibraryInfo));
addInitialAliasAnalysisPasses(MPM);
// Start of CallGraph SCC passes.
if (!DisableUnitAtATime)
MPM.add(createPruneEHPass()); // Remove dead EH info
- if (InlinerPass) {
- MPM.add(InlinerPass);
- InlinerPass = 0;
+ if (Inliner) {
+ MPM.add(Inliner);
+ Inliner = 0;
}
if (!DisableUnitAtATime)
MPM.add(createFunctionAttrsPass()); // Set readonly/readnone attrs
MPM.add(createLoopDeletionPass()); // Delete dead loops
if (!DisableUnrollLoops)
MPM.add(createLoopUnrollPass()); // Unroll small loops
+ addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
+
if (OptLevel > 1)
MPM.add(createGVNPass()); // Remove redundancies
MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
MPM.add(createConstantMergePass()); // Merge dup global constants
}
}
+
+ void populateLTOPassManager(PassManagerBase &PM, bool Internalize,
+ bool RunInliner) {
+ // Provide AliasAnalysis services for optimizations.
+ addInitialAliasAnalysisPasses(PM);
+
+ // Now that composite has been compiled, scan through the module, looking
+ // for a main function. If main is defined, mark all other functions
+ // internal.
+ if (Internalize)
+ PM.add(createInternalizePass(true));
+
+ // Propagate constants at call sites into the functions they call. This
+ // opens opportunities for globalopt (and inlining) by substituting function
+ // pointers passed as arguments to direct uses of functions.
+ PM.add(createIPSCCPPass());
+
+ // Now that we internalized some globals, see if we can hack on them!
+ PM.add(createGlobalOptimizerPass());
+
+ // Linking modules together can lead to duplicated global constants, only
+ // keep one copy of each constant.
+ PM.add(createConstantMergePass());
+
+ // Remove unused arguments from functions.
+ PM.add(createDeadArgEliminationPass());
+
+ // Reduce the code after globalopt and ipsccp. Both can open up significant
+ // simplification opportunities, and both can propagate functions through
+ // function pointers. When this happens, we often have to resolve varargs
+ // calls, etc, so let instcombine do this.
+ PM.add(createInstructionCombiningPass());
+
+ // Inline small functions
+ if (RunInliner)
+ PM.add(createFunctionInliningPass());
+
+ PM.add(createPruneEHPass()); // Remove dead EH info.
+
+ // Optimize globals again if we ran the inliner.
+ if (RunInliner)
+ PM.add(createGlobalOptimizerPass());
+ PM.add(createGlobalDCEPass()); // Remove dead functions.
+
+ // If we didn't decide to inline a function, check to see if we can
+ // transform it to pass arguments by value instead of by reference.
+ PM.add(createArgumentPromotionPass());
+
+ // The IPO passes may leave cruft around. Clean up after them.
+ PM.add(createInstructionCombiningPass());
+ PM.add(createJumpThreadingPass());
+ // Break up allocas
+ PM.add(createScalarReplAggregatesPass());
+
+ // Run a few AA driven optimizations here and now, to cleanup the code.
+ PM.add(createFunctionAttrsPass()); // Add nocapture.
+ PM.add(createGlobalsModRefPass()); // IP alias analysis.
+
+ PM.add(createLICMPass()); // Hoist loop invariants.
+ PM.add(createGVNPass()); // Remove redundancies.
+ PM.add(createMemCpyOptPass()); // Remove dead memcpys.
+ // Nuke dead stores.
+ PM.add(createDeadStoreEliminationPass());
+
+ // Cleanup and simplify the code after the scalar optimizations.
+ PM.add(createInstructionCombiningPass());
+
+ PM.add(createJumpThreadingPass());
+
+ // Delete basic blocks, which optimization passes may have killed.
+ PM.add(createCFGSimplificationPass());
+
+ // Now that we have optimized the program, discard unreachable functions.
+ PM.add(createGlobalDCEPass());
+ }
};
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