-//===- llvm/Pass.h - Base class for XForm Passes -----------------*- C++ -*--=//
+//===- llvm/Pass.h - Base class for Passes ----------------------*- C++ -*-===//
+//
+// 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 a base class that indicates that a specified class is a
// transformation pass implementation.
#include <map>
#include <iosfwd>
#include <typeinfo>
+#include <cassert>
+
+namespace llvm {
+
class Value;
-class BasicBlock;
+struct BasicBlock;
class Function;
class Module;
class AnalysisUsage;
class PassInfo;
+class ImmutablePass;
template<class UnitType> class PassManagerT;
struct AnalysisResolver;
friend class AnalysisResolver;
AnalysisResolver *Resolver; // AnalysisResolver this pass is owned by...
const PassInfo *PassInfoCache;
+
+ // AnalysisImpls - This keeps track of which passes implement the interfaces
+ // that are required by the current pass (to implement getAnalysis()).
+ //
+ std::vector<std::pair<const PassInfo*, Pass*> > AnalysisImpls;
+
void operator=(const Pass&); // DO NOT IMPLEMENT
Pass(const Pass &); // DO NOT IMPLEMENT
public:
/// implemented in terms of the name that is registered by one of the
/// Registration templates, but can be overloaded directly, and if nothing
/// else is available, C++ RTTI will be consulted to get a SOMEWHAT
- /// intelligable name for the pass.
+ /// intelligible name for the pass.
///
virtual const char *getPassName() const;
/// print - Print out the internal state of the pass. This is called by
/// Analyze to print out the contents of an analysis. Otherwise it is not
- /// neccesary to implement this method. Beware that the module pointer MAY be
+ /// necessary to implement this method. Beware that the module pointer MAY be
/// null. This automatically forwards to a virtual function that does not
/// provide the Module* in case the analysis doesn't need it it can just be
/// ignored.
// or null if it is not known.
static const PassInfo *lookupPassInfo(const std::type_info &TI);
-protected:
+ /// getAnalysisToUpdate<AnalysisType>() - This function is used by subclasses
+ /// to get to the analysis information that might be around that needs to be
+ /// updated. This is different than getAnalysis in that it can fail (ie the
+ /// analysis results haven't been computed), so should only be used if you
+ /// provide the capability to update an analysis that exists. This method is
+ /// often used by transformation APIs to update analysis results for a pass
+ /// automatically as the transform is performed.
+ ///
+ template<typename AnalysisType>
+ AnalysisType *getAnalysisToUpdate() const; // Defined in PassAnalysisSupport.h
+
+ /// mustPreserveAnalysisID - This method serves the same function as
+ /// getAnalysisToUpdate, but works if you just have an AnalysisID. This
+ /// obviously cannot give you a properly typed instance of the class if you
+ /// don't have the class name available (use getAnalysisToUpdate if you do),
+ /// but it can tell you if you need to preserve the pass at least.
+ ///
+ bool mustPreserveAnalysisID(const PassInfo *AnalysisID) const;
/// getAnalysis<AnalysisType>() - This function is used by subclasses to get
/// to the analysis information that they claim to use by overriding the
/// getAnalysisUsage function.
///
template<typename AnalysisType>
- AnalysisType &getAnalysis() {
+ AnalysisType &getAnalysis() const {
assert(Resolver && "Pass has not been inserted into a PassManager object!");
const PassInfo *PI = getClassPassInfo<AnalysisType>();
+ return getAnalysisID<AnalysisType>(PI);
+ }
+
+ template<typename AnalysisType>
+ AnalysisType &getAnalysisID(const PassInfo *PI) const {
+ assert(Resolver && "Pass has not been inserted into a PassManager object!");
assert(PI && "getAnalysis for unregistered pass!");
+ // PI *must* appear in AnalysisImpls. Because the number of passes used
+ // should be a small number, we just do a linear search over a (dense)
+ // vector.
+ Pass *ResultPass = 0;
+ for (unsigned i = 0; ; ++i) {
+ assert(i != AnalysisImpls.size() &&
+ "getAnalysis*() called on an analysis that was not "
+ "'required' by pass!");
+ if (AnalysisImpls[i].first == PI) {
+ ResultPass = AnalysisImpls[i].second;
+ break;
+ }
+ }
+
// Because the AnalysisType may not be a subclass of pass (for
// AnalysisGroups), we must use dynamic_cast here to potentially adjust the
// return pointer (because the class may multiply inherit, once from pass,
// once from AnalysisType).
//
- AnalysisType *Result =
- dynamic_cast<AnalysisType*>(Resolver->getAnalysis(PI));
+ AnalysisType *Result = dynamic_cast<AnalysisType*>(ResultPass);
assert(Result && "Pass does not implement interface required!");
return *Result;
}
- template<typename AnalysisType>
- AnalysisType &getAnalysisID(const PassInfo *PI) {
- assert(Resolver && "Pass has not been inserted into a PassManager object!");
- assert(PI && "getAnalysis for unregistered pass!");
- return *(AnalysisType*)Resolver->getAnalysis(PI);
- }
-
- /// getAnalysisToUpdate<AnalysisType>() - This function is used by subclasses
- /// to get to the analysis information that might be around that needs to be
- /// updated. This is different than getAnalysis in that it can fail (ie the
- /// analysis results haven't been computed), so should only be used if you
- /// provide the capability to update an analysis that exists.
- ///
- template<typename AnalysisType>
- AnalysisType *getAnalysisToUpdate() {
- assert(Resolver && "Pass not resident in a PassManager object!");
- const PassInfo *PI = getClassPassInfo<AnalysisType>();
- if (PI == 0) return 0;
- return (AnalysisType*)Resolver->getAnalysisToUpdate(PI);
- }
-
-
private:
friend class PassManagerT<Module>;
friend class PassManagerT<Function>;
P.print(OS, 0); return OS;
}
+
+
+//===----------------------------------------------------------------------===//
+/// ImmutablePass class - This class is used to provide information that does
+/// not need to be run. This is useful for things like target information and
+/// "basic" versions of AnalysisGroups.
+///
+struct ImmutablePass : public Pass {
+ /// initializePass - This method may be overriden by immutable passes to allow
+ /// them to perform various initialization actions they require. This is
+ /// primarily because an ImmutablePass can "require" another ImmutablePass,
+ /// and if it does, the overloaded version of initializePass may get access to
+ /// these passes with getAnalysis<>.
+ ///
+ virtual void initializePass() {}
+
+ /// ImmutablePasses are never run.
+ ///
+ virtual bool run(Module &M) { return false; }
+
+private:
+ friend class PassManagerT<Module>;
+ virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU);
+};
+
+
//===----------------------------------------------------------------------===//
/// FunctionPass class - This class is used to implement most global
/// optimizations. Optimizations should subclass this class if they meet the
/// following constraints:
///
-/// 1. Optimizations are organized globally, ie a function at a time
+/// 1. Optimizations are organized globally, i.e., a function at a time
/// 2. Optimizing a function does not cause the addition or removal of any
/// functions in the module
///
struct FunctionPass : public Pass {
/// doInitialization - Virtual method overridden by subclasses to do
- /// any neccesary per-module initialization.
+ /// any necessary per-module initialization.
///
virtual bool doInitialization(Module &M) { return false; }
/// instruction at a time.
/// 2. Optimizations do not modify the CFG of the contained function, or any
/// other basic block in the function.
-/// 3. Optimizations conform to all of the contstraints of FunctionPass's.
+/// 3. Optimizations conform to all of the constraints of FunctionPass's.
///
struct BasicBlockPass : public FunctionPass {
+ /// doInitialization - Virtual method overridden by subclasses to do
+ /// any necessary per-module initialization.
+ ///
+ virtual bool doInitialization(Module &M) { return false; }
+
+ /// doInitialization - Virtual method overridden by BasicBlockPass subclasses
+ /// to do any necessary per-function initialization.
+ ///
+ virtual bool doInitialization(Function &F) { return false; }
+
/// runOnBasicBlock - Virtual method overriden by subclasses to do the
/// per-basicblock processing of the pass.
///
virtual bool runOnBasicBlock(BasicBlock &BB) = 0;
- /// To run this pass on a function, we simply call runOnBasicBlock once for
- /// each function.
+ /// doFinalization - Virtual method overriden by BasicBlockPass subclasses to
+ /// do any post processing needed after all passes have run.
///
- virtual bool runOnFunction(Function &F);
+ virtual bool doFinalization(Function &F) { return false; }
+
+ /// doFinalization - Virtual method overriden by subclasses to do any post
+ /// processing needed after all passes have run.
+ ///
+ virtual bool doFinalization(Module &M) { return false; }
+
+
+ // To run this pass on a function, we simply call runOnBasicBlock once for
+ // each function.
+ //
+ bool runOnFunction(Function &F);
/// To run directly on the basic block, we initialize, runOnBasicBlock, then
/// finalize.
virtual void addToPassManager(PassManagerT<BasicBlock> *PM,AnalysisUsage &AU);
};
+/// If the user specifies the -time-passes argument on an LLVM tool command line
+/// then the value of this boolean will be true, otherwise false.
+/// @brief This is the storage for the -time-passes option.
+extern bool TimePassesIsEnabled;
+
+} // End llvm namespace
+
// Include support files that contain important APIs commonly used by Passes,
-// but that we want to seperate out to make it easier to read the header files.
+// but that we want to separate out to make it easier to read the header files.
//
#include "llvm/PassSupport.h"
#include "llvm/PassAnalysisSupport.h"
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