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function. This is crude but effective git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2505 91177308-0d34-0410-b5e6-96231b3b80d8
330 lines
12 KiB
C++
330 lines
12 KiB
C++
//===- llvm/Pass.h - Base class for XForm Passes -----------------*- C++ -*--=//
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//
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// This file defines a base class that indicates that a specified class is a
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// transformation pass implementation.
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//
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// Pass's are designed this way so that it is possible to run passes in a cache
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// and organizationally optimal order without having to specify it at the front
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// end. This allows arbitrary passes to be strung together and have them
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// executed as effeciently as possible.
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//
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// Passes should extend one of the classes below, depending on the guarantees
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// that it can make about what will be modified as it is run. For example, most
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// global optimizations should derive from FunctionPass, because they do not add
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// or delete functions, they operate on the internals of the function.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PASS_H
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#define LLVM_PASS_H
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#include <vector>
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#include <map>
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class Value;
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class BasicBlock;
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class Function;
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class Module;
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class AnalysisUsage;
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class AnalysisID;
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template<class UnitType> class PassManagerT;
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struct AnalysisResolver;
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//===----------------------------------------------------------------------===//
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// Pass interface - Implemented by all 'passes'. Subclass this if you are an
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// interprocedural optimization or you do not fit into any of the more
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// constrained passes described below.
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//
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class Pass {
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friend class AnalysisResolver;
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AnalysisResolver *Resolver; // AnalysisResolver this pass is owned by...
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public:
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inline Pass(AnalysisResolver *AR = 0) : Resolver(AR) {}
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inline virtual ~Pass() {} // Destructor is virtual so we can be subclassed
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// getPassName - Return a nice clean name for a pass. This should be
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// overloaded by the pass, but if it is not, C++ RTTI will be consulted to get
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// a SOMEWHAT intelligable name for the pass.
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//
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virtual const char *getPassName() const;
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// run - Run this pass, returning true if a modification was made to the
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// module argument. This should be implemented by all concrete subclasses.
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//
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virtual bool run(Module *M) = 0;
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// getAnalysisUsage - This function should be overriden by passes that need
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// analysis information to do their job. If a pass specifies that it uses a
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// particular analysis result to this function, it can then use the
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// getAnalysis<AnalysisType>() function, below.
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//
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virtual void getAnalysisUsage(AnalysisUsage &Info) const {
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// By default, no analysis results are used, all are invalidated.
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}
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// releaseMemory() - This member can be implemented by a pass if it wants to
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// be able to release its memory when it is no longer needed. The default
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// behavior of passes is to hold onto memory for the entire duration of their
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// lifetime (which is the entire compile time). For pipelined passes, this
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// is not a big deal because that memory gets recycled every time the pass is
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// invoked on another program unit. For IP passes, it is more important to
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// free memory when it is unused.
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//
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// Optionally implement this function to release pass memory when it is no
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// longer used.
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//
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virtual void releaseMemory() {}
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// dumpPassStructure - Implement the -debug-passes=PassStructure option
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virtual void dumpPassStructure(unsigned Offset = 0);
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protected:
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// getAnalysis<AnalysisType>() - This function is used by subclasses to get to
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// the analysis information that they claim to use by overriding the
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// getAnalysisUsage function.
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//
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template<typename AnalysisType>
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AnalysisType &getAnalysis(AnalysisID AID = AnalysisType::ID) {
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assert(Resolver && "Pass not resident in a PassManager object!");
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return *(AnalysisType*)Resolver->getAnalysis(AID);
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}
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// getAnalysisToUpdate<AnalysisType>() - This function is used by subclasses
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// to get to the analysis information that might be around that needs to be
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// updated. This is different than getAnalysis in that it can fail (ie the
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// analysis results haven't been computed), so should only be used if you
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// provide the capability to update an analysis that exists.
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//
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template<typename AnalysisType>
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AnalysisType *getAnalysisToUpdate(AnalysisID AID = AnalysisType::ID) {
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assert(Resolver && "Pass not resident in a PassManager object!");
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return (AnalysisType*)Resolver->getAnalysisToUpdate(AID);
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}
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private:
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friend class PassManagerT<Module>;
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friend class PassManagerT<Function>;
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friend class PassManagerT<BasicBlock>;
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virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU);
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};
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//===----------------------------------------------------------------------===//
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// FunctionPass class - This class is used to implement most global
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// optimizations. Optimizations should subclass this class if they meet the
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// following constraints:
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//
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// 1. Optimizations are organized globally, ie a function at a time
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// 2. Optimizing a function does not cause the addition or removal of any
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// functions in the module
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//
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struct FunctionPass : public Pass {
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// doInitialization - Virtual method overridden by subclasses to do
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// any neccesary per-module initialization.
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//
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virtual bool doInitialization(Module *M) { return false; }
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// runOnFunction - Virtual method overriden by subclasses to do the
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// per-function processing of the pass.
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//
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virtual bool runOnFunction(Function *F) = 0;
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// doFinalization - Virtual method overriden by subclasses to do any post
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// processing needed after all passes have run.
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//
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virtual bool doFinalization(Module *M) { return false; }
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// run - On a module, we run this pass by initializing, ronOnFunction'ing once
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// for every function in the module, then by finalizing.
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//
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virtual bool run(Module *M);
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// run - On a function, we simply initialize, run the function, then finalize.
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//
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bool run(Function *F);
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private:
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friend class PassManagerT<Module>;
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friend class PassManagerT<Function>;
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friend class PassManagerT<BasicBlock>;
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virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU);
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virtual void addToPassManager(PassManagerT<Function> *PM, AnalysisUsage &AU);
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};
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//===----------------------------------------------------------------------===//
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// BasicBlockPass class - This class is used to implement most local
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// optimizations. Optimizations should subclass this class if they
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// meet the following constraints:
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// 1. Optimizations are local, operating on either a basic block or
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// instruction at a time.
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// 2. Optimizations do not modify the CFG of the contained function, or any
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// other basic block in the function.
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// 3. Optimizations conform to all of the contstraints of FunctionPass's.
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//
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struct BasicBlockPass : public FunctionPass {
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// runOnBasicBlock - Virtual method overriden by subclasses to do the
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// per-basicblock processing of the pass.
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//
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virtual bool runOnBasicBlock(BasicBlock *M) = 0;
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// To run this pass on a function, we simply call runOnBasicBlock once for
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// each function.
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//
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virtual bool runOnFunction(Function *F);
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// To run directly on the basic block, we initialize, runOnBasicBlock, then
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// finalize.
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//
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bool run(BasicBlock *BB);
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private:
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friend class PassManagerT<Function>;
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friend class PassManagerT<BasicBlock>;
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virtual void addToPassManager(PassManagerT<Function> *PM, AnalysisUsage &AU);
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virtual void addToPassManager(PassManagerT<BasicBlock> *PM,AnalysisUsage &AU);
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};
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// CreatePass - Helper template to invoke the constructor for the AnalysisID
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// class. Note that this should be a template internal to AnalysisID, but
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// GCC 2.95.3 crashes if we do that, doh.
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//
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template<class AnalysisType>
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static Pass *CreatePass(AnalysisID ID) { return new AnalysisType(ID); }
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//===----------------------------------------------------------------------===//
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// AnalysisID - This class is used to uniquely identify an analysis pass that
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// is referenced by a transformation.
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//
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class AnalysisID {
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static unsigned NextID; // Next ID # to deal out...
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unsigned ID; // Unique ID for this analysis
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Pass *(*Constructor)(AnalysisID); // Constructor to return the Analysis
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AnalysisID(); // Disable default ctor
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AnalysisID(unsigned id, Pass *(*Ct)(AnalysisID)) : ID(id), Constructor(Ct) {}
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public:
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// create - the only way to define a new AnalysisID. This static method is
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// supposed to be used to define the class static AnalysisID's that are
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// provided by analysis passes. In the implementation (.cpp) file for the
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// class, there should be a line that looks like this (using CallGraph as an
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// example):
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//
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// AnalysisID CallGraph::ID(AnalysisID::create<CallGraph>());
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//
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template<class AnalysisType>
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static AnalysisID create() {
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return AnalysisID(NextID++, CreatePass<AnalysisType>);
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}
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// Special Copy Constructor - This is how analysis passes declare that they
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// only depend on the CFG of the function they are working on, so they are not
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// invalidated by other passes that do not modify the CFG. This should be
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// used like this:
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// AnalysisID DominatorSet::ID(AnalysisID::create<DominatorSet>(), true);
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//
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AnalysisID(const AnalysisID &AID, bool DependsOnlyOnCFG = false);
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inline Pass *createPass() const { return Constructor(*this); }
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inline bool operator==(const AnalysisID &A) const {
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return A.ID == ID;
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}
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inline bool operator!=(const AnalysisID &A) const {
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return A.ID != ID;
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}
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inline bool operator<(const AnalysisID &A) const {
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return ID < A.ID;
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}
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};
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//===----------------------------------------------------------------------===//
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// AnalysisUsage - Represent the analysis usage information of a pass. This
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// tracks analyses that the pass REQUIRES (must available when the pass runs),
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// and analyses that the pass PRESERVES (the pass does not invalidate the
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// results of these analyses). This information is provided by a pass to the
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// Pass infrastructure through the getAnalysisUsage virtual function.
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//
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class AnalysisUsage {
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// Sets of analyses required and preserved by a pass
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std::vector<AnalysisID> Required, Preserved, Provided;
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bool PreservesAll;
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public:
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AnalysisUsage() : PreservesAll(false) {}
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// addRequires - Add the specified ID to the required set of the usage info
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// for a pass.
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//
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AnalysisUsage &addRequired(AnalysisID ID) {
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Required.push_back(ID);
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return *this;
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}
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// addPreserves - Add the specified ID to the set of analyses preserved by
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// this pass
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//
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AnalysisUsage &addPreserved(AnalysisID ID) {
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Preserved.push_back(ID);
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return *this;
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}
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void addProvided(AnalysisID ID) {
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Provided.push_back(ID);
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}
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// PreservesAll - Set by analyses that do not transform their input at all
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void setPreservesAll() { PreservesAll = true; }
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bool preservesAll() const { return PreservesAll; }
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// preservesCFG - This function should be called to by the pass, iff they do
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// not:
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//
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// 1. Add or remove basic blocks from the function
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// 2. Modify terminator instructions in any way.
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//
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// This function annotates the AnalysisUsage info object to say that analyses
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// that only depend on the CFG are preserved by this pass.
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//
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void preservesCFG();
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const std::vector<AnalysisID> &getRequiredSet() const { return Required; }
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const std::vector<AnalysisID> &getPreservedSet() const { return Preserved; }
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const std::vector<AnalysisID> &getProvidedSet() const { return Provided; }
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};
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//===----------------------------------------------------------------------===//
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// AnalysisResolver - Simple interface implemented by PassManagers objects that
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// is used to pull analysis information out of them.
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//
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struct AnalysisResolver {
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virtual Pass *getAnalysisOrNullUp(AnalysisID ID) const = 0;
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virtual Pass *getAnalysisOrNullDown(AnalysisID ID) const = 0;
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Pass *getAnalysis(AnalysisID ID) {
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Pass *Result = getAnalysisOrNullUp(ID);
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assert(Result && "Pass has an incorrect analysis uses set!");
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return Result;
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}
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// getAnalysisToUpdate - Return an analysis result or null if it doesn't exist
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Pass *getAnalysisToUpdate(AnalysisID ID) {
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Pass *Result = getAnalysisOrNullUp(ID);
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return Result;
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}
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virtual unsigned getDepth() const = 0;
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virtual void markPassUsed(AnalysisID P, Pass *User) = 0;
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void startPass(Pass *P) {}
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void endPass(Pass *P) {}
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protected:
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void setAnalysisResolver(Pass *P, AnalysisResolver *AR);
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};
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#endif
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