mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 03:29:40 +00:00
* Implement pass memory freeing after the pass is unused * Expose PassManager typedef in Pass.h instead of PassManager.h git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1617 91177308-0d34-0410-b5e6-96231b3b80d8
264 lines
9.9 KiB
C++
264 lines
9.9 KiB
C++
//===- llvm/Pass.h - Base class for XForm Passes -----------------*- C++ -*--=//
|
|
//
|
|
// This file defines a base class that indicates that a specified class is a
|
|
// transformation pass implementation.
|
|
//
|
|
// Pass's are designed this way so that it is possible to run passes in a cache
|
|
// and organizationally optimal order without having to specify it at the front
|
|
// end. This allows arbitrary passes to be strung together and have them
|
|
// executed as effeciently as possible.
|
|
//
|
|
// Passes should extend one of the classes below, depending on the guarantees
|
|
// that it can make about what will be modified as it is run. For example, most
|
|
// global optimizations should derive from MethodPass, because they do not add
|
|
// or delete methods, they operate on the internals of the method.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_PASS_H
|
|
#define LLVM_PASS_H
|
|
|
|
#include <vector>
|
|
#include <map>
|
|
class Value;
|
|
class BasicBlock;
|
|
class Method;
|
|
class Module;
|
|
class AnalysisID;
|
|
class Pass;
|
|
template<class UnitType> class PassManagerT;
|
|
struct AnalysisResolver;
|
|
|
|
// PassManager - Top level PassManagerT instantiation intended to be used.
|
|
// Implemented in PassManager.h
|
|
typedef PassManagerT<Module> PassManager;
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Pass interface - Implemented by all 'passes'. Subclass this if you are an
|
|
// interprocedural optimization or you do not fit into any of the more
|
|
// constrained passes described below.
|
|
//
|
|
class Pass {
|
|
friend class AnalysisResolver;
|
|
AnalysisResolver *Resolver; // AnalysisResolver this pass is owned by...
|
|
public:
|
|
typedef std::vector<AnalysisID> AnalysisSet;
|
|
|
|
inline Pass(AnalysisResolver *AR = 0) : Resolver(AR) {}
|
|
inline virtual ~Pass() {} // Destructor is virtual so we can be subclassed
|
|
|
|
|
|
// run - Run this pass, returning true if a modification was made to the
|
|
// module argument. This should be implemented by all concrete subclasses.
|
|
//
|
|
virtual bool run(Module *M) = 0;
|
|
|
|
// getAnalysisUsageInfo - This function should be overriden by passes that
|
|
// need analysis information to do their job. If a pass specifies that it
|
|
// uses a particular analysis result to this function, it can then use the
|
|
// getAnalysis<AnalysisType>() function, below.
|
|
//
|
|
// The Destroyed vector is used to communicate what analyses are invalidated
|
|
// by this pass. This is critical to specify so that the PassManager knows
|
|
// which analysis must be rerun after this pass has proceeded. Analysis are
|
|
// only invalidated if run() returns true.
|
|
//
|
|
// The Provided vector is used for passes that provide analysis information,
|
|
// these are the analysis passes themselves. All analysis passes should
|
|
// override this method to return themselves in the provided set.
|
|
//
|
|
virtual void getAnalysisUsageInfo(AnalysisSet &Required,
|
|
AnalysisSet &Destroyed,
|
|
AnalysisSet &Provided) {
|
|
// By default, no analysis results are used or destroyed.
|
|
}
|
|
|
|
// releaseMemory() - This member can be implemented by a pass if it wants to
|
|
// be able to release its memory when it is no longer needed. The default
|
|
// behavior of passes is to hold onto memory for the entire duration of their
|
|
// lifetime (which is the entire compile time). For pipelined passes, this
|
|
// is not a big deal because that memory gets recycled every time the pass is
|
|
// invoked on another program unit. For IP passes, it is more important to
|
|
// free memory when it is unused.
|
|
//
|
|
// Optionally implement this function to release pass memory when it is no
|
|
// longer used.
|
|
//
|
|
virtual void releaseMemory() {}
|
|
|
|
#ifndef NDEBUG
|
|
// dumpPassStructure - Implement the -debug-passes=PassStructure option
|
|
virtual void dumpPassStructure(unsigned Offset = 0);
|
|
#endif
|
|
|
|
protected:
|
|
// getAnalysis<AnalysisType>() - This function is used by subclasses to get to
|
|
// the analysis information that they claim to use by overriding the
|
|
// getAnalysisUsageInfo function.
|
|
//
|
|
template<typename AnalysisType>
|
|
AnalysisType &getAnalysis(AnalysisID AID = AnalysisType::ID) {
|
|
assert(Resolver && "Pass not resident in a PassManager object!");
|
|
return *(AnalysisType*)Resolver->getAnalysis(AID);
|
|
}
|
|
|
|
private:
|
|
friend class PassManagerT<Module>;
|
|
friend class PassManagerT<Method>;
|
|
friend class PassManagerT<BasicBlock>;
|
|
virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisSet &Req,
|
|
AnalysisSet &Destroyed, AnalysisSet &Provided);
|
|
};
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// MethodPass 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 method at a time
|
|
// 2. Optimizing a method does not cause the addition or removal of any methods
|
|
// in the module
|
|
//
|
|
struct MethodPass : public Pass {
|
|
// doInitialization - Virtual method overridden by subclasses to do
|
|
// any neccesary per-module initialization.
|
|
//
|
|
virtual bool doInitialization(Module *M) { return false; }
|
|
|
|
// runOnMethod - Virtual method overriden by subclasses to do the per-method
|
|
// processing of the pass.
|
|
//
|
|
virtual bool runOnMethod(Method *M) = 0;
|
|
|
|
// doFinalization - Virtual method overriden by subclasses to do any post
|
|
// processing needed after all passes have run.
|
|
//
|
|
virtual bool doFinalization(Module *M) { return false; }
|
|
|
|
// run - On a module, we run this pass by initializing, ronOnMethod'ing once
|
|
// for every method in the module, then by finalizing.
|
|
//
|
|
virtual bool run(Module *M);
|
|
|
|
// run - On a method, we simply initialize, run the method, then finalize.
|
|
//
|
|
bool run(Method *M);
|
|
|
|
private:
|
|
friend class PassManagerT<Module>;
|
|
friend class PassManagerT<Method>;
|
|
friend class PassManagerT<BasicBlock>;
|
|
virtual void addToPassManager(PassManagerT<Module> *PM, AnalysisSet &Req,
|
|
AnalysisSet &Dest, AnalysisSet &Prov);
|
|
virtual void addToPassManager(PassManagerT<Method> *PM,AnalysisSet &Req,
|
|
AnalysisSet &Dest, AnalysisSet &Prov);
|
|
};
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// BasicBlockPass class - This class is used to implement most local
|
|
// optimizations. Optimizations should subclass this class if they
|
|
// meet the following constraints:
|
|
// 1. Optimizations are local, operating on either a basic block or
|
|
// instruction at a time.
|
|
// 2. Optimizations do not modify the CFG of the contained method, or any
|
|
// other basic block in the method.
|
|
// 3. Optimizations conform to all of the contstraints of MethodPass's.
|
|
//
|
|
struct BasicBlockPass : public MethodPass {
|
|
// runOnBasicBlock - Virtual method overriden by subclasses to do the
|
|
// per-basicblock processing of the pass.
|
|
//
|
|
virtual bool runOnBasicBlock(BasicBlock *M) = 0;
|
|
|
|
// To run this pass on a method, we simply call runOnBasicBlock once for each
|
|
// method.
|
|
//
|
|
virtual bool runOnMethod(Method *BB);
|
|
|
|
// To run directly on the basic block, we initialize, runOnBasicBlock, then
|
|
// finalize.
|
|
//
|
|
bool run(BasicBlock *BB);
|
|
|
|
private:
|
|
friend class PassManagerT<Method>;
|
|
friend class PassManagerT<BasicBlock>;
|
|
virtual void addToPassManager(PassManagerT<Method> *PM, AnalysisSet &,
|
|
AnalysisSet &, AnalysisSet &);
|
|
virtual void addToPassManager(PassManagerT<BasicBlock> *PM, AnalysisSet &,
|
|
AnalysisSet &, AnalysisSet &);
|
|
};
|
|
|
|
|
|
// CreatePass - Helper template to invoke the constructor for the AnalysisID
|
|
// class. Note that this should be a template internal to AnalysisID, but
|
|
// GCC 2.95.3 crashes if we do that, doh.
|
|
//
|
|
template<class AnalysisType>
|
|
static Pass *CreatePass(AnalysisID ID) { return new AnalysisType(ID); }
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// AnalysisID - This class is used to uniquely identify an analysis pass that
|
|
// is referenced by a transformation.
|
|
//
|
|
class AnalysisID {
|
|
static unsigned NextID; // Next ID # to deal out...
|
|
unsigned ID; // Unique ID for this analysis
|
|
Pass *(*Constructor)(AnalysisID); // Constructor to return the Analysis
|
|
|
|
AnalysisID(); // Disable default ctor
|
|
AnalysisID(unsigned id, Pass *(*Ct)(AnalysisID)) : ID(id), Constructor(Ct) {}
|
|
public:
|
|
// create - the only way to define a new AnalysisID. This static method is
|
|
// supposed to be used to define the class static AnalysisID's that are
|
|
// provided by analysis passes. In the implementation (.cpp) file for the
|
|
// class, there should be a line that looks like this (using CallGraph as an
|
|
// example):
|
|
//
|
|
// AnalysisID CallGraph::ID(AnalysisID::create<CallGraph>());
|
|
//
|
|
template<class AnalysisType>
|
|
static AnalysisID create() {
|
|
return AnalysisID(NextID++, CreatePass<AnalysisType>);
|
|
}
|
|
|
|
inline Pass *createPass() const { return Constructor(*this); }
|
|
|
|
inline bool operator==(const AnalysisID &A) const {
|
|
return A.ID == ID;
|
|
}
|
|
inline bool operator!=(const AnalysisID &A) const {
|
|
return A.ID != ID;
|
|
}
|
|
inline bool operator<(const AnalysisID &A) const {
|
|
return ID < A.ID;
|
|
}
|
|
};
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// AnalysisResolver - Simple interface implemented by PassManagers objects that
|
|
// is used to pull analysis information out of them.
|
|
//
|
|
struct AnalysisResolver {
|
|
virtual Pass *getAnalysisOrNullUp(AnalysisID ID) const = 0;
|
|
virtual Pass *getAnalysisOrNullDown(AnalysisID ID) const = 0;
|
|
Pass *getAnalysis(AnalysisID ID) {
|
|
Pass *Result = getAnalysisOrNullUp(ID);
|
|
assert(Result && "Pass has an incorrect analysis uses set!");
|
|
return Result;
|
|
}
|
|
virtual unsigned getDepth() const = 0;
|
|
|
|
virtual void markPassUsed(AnalysisID P, Pass *User) = 0;
|
|
protected:
|
|
void setAnalysisResolver(Pass *P, AnalysisResolver *AR);
|
|
};
|
|
|
|
|
|
|
|
#endif
|