Vendor import of llvm trunk r132879:

http://llvm.org/svn/llvm-project/llvm/trunk@132879

1 files changed, 322 insertions, 0 deletions

diff --git a/include/llvm/Support/PassManagerBuilder.h b/include/llvm/Support/PassManagerBuilder.h
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+//===-- llvm/Support/PassManagerBuilder.h - Build Standard Pass -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the PassManagerBuilder class, which is used to set up a
+// "standard" optimization sequence suitable for languages like C and C++.
+//
+// These are implemented as inline functions so that we do not have to worry
+// about link issues.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_PASSMANAGERBUILDER_H
+#define LLVM_SUPPORT_PASSMANAGERBUILDER_H
+
+#include "llvm/PassManager.h"
+#include "llvm/DefaultPasses.h"
+#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Target/TargetLibraryInfo.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Transforms/IPO.h"
+
+namespace llvm {
+  
+/// PassManagerBuilder - This class is used to set up a standard optimization
+/// sequence for languages like C and C++, allowing some APIs to customize the
+/// pass sequence in various ways. A simple example of using it would be:
+///
+///  PassManagerBuilder Builder;
+///  Builder.OptLevel = 2;
+///  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 {
+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;
+    LibraryInfo = 0;
+    Inliner = 0;
+    DisableSimplifyLibCalls = false;
+    DisableUnitAtATime = false;
+    DisableUnrollLoops = false;
+  }
+  
+  ~PassManagerBuilder() {
+    delete LibraryInfo;
+    delete Inliner;
+  }
+  
+  void addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
+    Extensions.push_back(std::make_pair(Ty, Fn));
+  }
+  
+private:
+  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.
+    PM.add(createTypeBasedAliasAnalysisPass());
+    PM.add(createBasicAliasAnalysisPass());
+  }
+public:
+  
+  /// populateFunctionPassManager - This fills in the function pass manager,
+  /// 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) {
+    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());
+    FPM.add(createScalarReplAggregatesPass());
+    FPM.add(createEarlyCSEPass());
+  }
+  
+  /// populateModulePassManager - This sets up the primary pass manager.
+  void populateModulePassManager(PassManagerBase &MPM) {
+    // If all optimizations are disabled, just run the always-inline pass.
+    if (OptLevel == 0) {
+      if (Inliner) {
+        MPM.add(Inliner);
+        Inliner = 0;
+      }
+      return;
+    }
+      
+    // Add LibraryInfo if we have some.
+    if (LibraryInfo) MPM.add(new TargetLibraryInfo(*LibraryInfo));
+
+    addInitialAliasAnalysisPasses(MPM);
+    
+    if (!DisableUnitAtATime) {
+      MPM.add(createGlobalOptimizerPass());     // Optimize out global vars
+      
+      MPM.add(createIPSCCPPass());              // IP SCCP
+      MPM.add(createDeadArgEliminationPass());  // Dead argument elimination
+      
+      MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
+      MPM.add(createCFGSimplificationPass());   // Clean up after IPCP & DAE
+    }
+    
+    // Start of CallGraph SCC passes.
+    if (!DisableUnitAtATime)
+      MPM.add(createPruneEHPass());             // Remove dead EH info
+    if (Inliner) {
+      MPM.add(Inliner);
+      Inliner = 0;
+    }
+    if (!DisableUnitAtATime)
+      MPM.add(createFunctionAttrsPass());       // Set readonly/readnone attrs
+    if (OptLevel > 2)
+      MPM.add(createArgumentPromotionPass());   // Scalarize uninlined fn args
+    
+    // Start of function pass.
+    // Break up aggregate allocas, using SSAUpdater.
+    MPM.add(createScalarReplAggregatesPass(-1, false));
+    MPM.add(createEarlyCSEPass());              // Catch trivial redundancies
+    if (!DisableSimplifyLibCalls)
+      MPM.add(createSimplifyLibCallsPass());    // Library Call Optimizations
+    MPM.add(createJumpThreadingPass());         // Thread jumps.
+    MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
+    MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
+    MPM.add(createInstructionCombiningPass());  // Combine silly seq's
+    
+    MPM.add(createTailCallEliminationPass());   // Eliminate tail calls
+    MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
+    MPM.add(createReassociatePass());           // Reassociate expressions
+    MPM.add(createLoopRotatePass());            // Rotate Loop
+    MPM.add(createLICMPass());                  // Hoist loop invariants
+    MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
+    MPM.add(createInstructionCombiningPass());  
+    MPM.add(createIndVarSimplifyPass());        // Canonicalize indvars
+    MPM.add(createLoopIdiomPass());             // Recognize idioms like memset.
+    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(createSCCPPass());                  // Constant prop with SCCP
+    
+    // Run instcombine after redundancy elimination to exploit opportunities
+    // opened up by them.
+    MPM.add(createInstructionCombiningPass());
+    MPM.add(createJumpThreadingPass());         // Thread jumps
+    MPM.add(createCorrelatedValuePropagationPass());
+    MPM.add(createDeadStoreEliminationPass());  // Delete dead stores
+    MPM.add(createAggressiveDCEPass());         // Delete dead instructions
+    MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
+    MPM.add(createInstructionCombiningPass());  // Clean up after everything.
+    
+    if (!DisableUnitAtATime) {
+      MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
+      MPM.add(createDeadTypeEliminationPass()); // Eliminate dead types
+      
+      // GlobalOpt already deletes dead functions and globals, at -O3 try a
+      // late pass of GlobalDCE.  It is capable of deleting dead cycles.
+      if (OptLevel > 2)
+        MPM.add(createGlobalDCEPass());         // Remove dead fns and globals.
+      
+      if (OptLevel > 1)
+        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());
+  }
+};
+
+  
+} // end namespace llvm
+#endif