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+//===- InstVisitor.h - Instruction visitor templates ------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef LLVM_IR_INSTVISITOR_H
+#define LLVM_IR_INSTVISITOR_H
+
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/ErrorHandling.h"
+
+namespace llvm {
+
+// We operate on opaque instruction classes, so forward declare all instruction
+// types now...
+//
+#define HANDLE_INST(NUM, OPCODE, CLASS) class CLASS;
+#include "llvm/IR/Instruction.def"
+
+#define DELEGATE(CLASS_TO_VISIT) \
+ return static_cast<SubClass*>(this)-> \
+ visit##CLASS_TO_VISIT(static_cast<CLASS_TO_VISIT&>(I))
+
+
+/// @brief Base class for instruction visitors
+///
+/// Instruction visitors are used when you want to perform different actions
+/// for different kinds of instructions without having to use lots of casts
+/// and a big switch statement (in your code, that is).
+///
+/// To define your own visitor, inherit from this class, specifying your
+/// new type for the 'SubClass' template parameter, and "override" visitXXX
+/// functions in your class. I say "override" because this class is defined
+/// in terms of statically resolved overloading, not virtual functions.
+///
+/// For example, here is a visitor that counts the number of malloc
+/// instructions processed:
+///
+/// /// Declare the class. Note that we derive from InstVisitor instantiated
+/// /// with _our new subclasses_ type.
+/// ///
+/// struct CountAllocaVisitor : public InstVisitor<CountAllocaVisitor> {
+/// unsigned Count;
+/// CountAllocaVisitor() : Count(0) {}
+///
+/// void visitAllocaInst(AllocaInst &AI) { ++Count; }
+/// };
+///
+/// And this class would be used like this:
+/// CountAllocaVisitor CAV;
+/// CAV.visit(function);
+/// NumAllocas = CAV.Count;
+///
+/// The defined has 'visit' methods for Instruction, and also for BasicBlock,
+/// Function, and Module, which recursively process all contained instructions.
+///
+/// Note that if you don't implement visitXXX for some instruction type,
+/// the visitXXX method for instruction superclass will be invoked. So
+/// if instructions are added in the future, they will be automatically
+/// supported, if you handle one of their superclasses.
+///
+/// The optional second template argument specifies the type that instruction
+/// visitation functions should return. If you specify this, you *MUST* provide
+/// an implementation of visitInstruction though!.
+///
+/// Note that this class is specifically designed as a template to avoid
+/// virtual function call overhead. Defining and using an InstVisitor is just
+/// as efficient as having your own switch statement over the instruction
+/// opcode.
+template<typename SubClass, typename RetTy=void>
+class InstVisitor {
+ //===--------------------------------------------------------------------===//
+ // Interface code - This is the public interface of the InstVisitor that you
+ // use to visit instructions...
+ //
+
+public:
+ // Generic visit method - Allow visitation to all instructions in a range
+ template<class Iterator>
+ void visit(Iterator Start, Iterator End) {
+ while (Start != End)
+ static_cast<SubClass*>(this)->visit(*Start++);
+ }
+
+ // Define visitors for functions and basic blocks...
+ //
+ void visit(Module &M) {
+ static_cast<SubClass*>(this)->visitModule(M);
+ visit(M.begin(), M.end());
+ }
+ void visit(Function &F) {
+ static_cast<SubClass*>(this)->visitFunction(F);
+ visit(F.begin(), F.end());
+ }
+ void visit(BasicBlock &BB) {
+ static_cast<SubClass*>(this)->visitBasicBlock(BB);
+ visit(BB.begin(), BB.end());
+ }
+
+ // Forwarding functions so that the user can visit with pointers AND refs.
+ void visit(Module *M) { visit(*M); }
+ void visit(Function *F) { visit(*F); }
+ void visit(BasicBlock *BB) { visit(*BB); }
+ RetTy visit(Instruction *I) { return visit(*I); }
+
+ // visit - Finally, code to visit an instruction...
+ //
+ RetTy visit(Instruction &I) {
+ static_assert(std::is_base_of<InstVisitor, SubClass>::value,
+ "Must pass the derived type to this template!");
+
+ switch (I.getOpcode()) {
+ default: llvm_unreachable("Unknown instruction type encountered!");
+ // Build the switch statement using the Instruction.def file...
+#define HANDLE_INST(NUM, OPCODE, CLASS) \
+ case Instruction::OPCODE: return \
+ static_cast<SubClass*>(this)-> \
+ visit##OPCODE(static_cast<CLASS&>(I));
+#include "llvm/IR/Instruction.def"
+ }
+ }
+
+ //===--------------------------------------------------------------------===//
+ // Visitation functions... these functions provide default fallbacks in case
+ // the user does not specify what to do for a particular instruction type.
+ // The default behavior is to generalize the instruction type to its subtype
+ // and try visiting the subtype. All of this should be inlined perfectly,
+ // because there are no virtual functions to get in the way.
+ //
+
+ // When visiting a module, function or basic block directly, these methods get
+ // called to indicate when transitioning into a new unit.
+ //
+ void visitModule (Module &M) {}
+ void visitFunction (Function &F) {}
+ void visitBasicBlock(BasicBlock &BB) {}
+
+ // Define instruction specific visitor functions that can be overridden to
+ // handle SPECIFIC instructions. These functions automatically define
+ // visitMul to proxy to visitBinaryOperator for instance in case the user does
+ // not need this generality.
+ //
+ // These functions can also implement fan-out, when a single opcode and
+ // instruction have multiple more specific Instruction subclasses. The Call
+ // instruction currently supports this. We implement that by redirecting that
+ // instruction to a special delegation helper.
+#define HANDLE_INST(NUM, OPCODE, CLASS) \
+ RetTy visit##OPCODE(CLASS &I) { \
+ if (NUM == Instruction::Call) \
+ return delegateCallInst(I); \
+ else \
+ DELEGATE(CLASS); \
+ }
+#include "llvm/IR/Instruction.def"
+
+ // Specific Instruction type classes... note that all of the casts are
+ // necessary because we use the instruction classes as opaque types...
+ //
+ RetTy visitReturnInst(ReturnInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitBranchInst(BranchInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitSwitchInst(SwitchInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitIndirectBrInst(IndirectBrInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitResumeInst(ResumeInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitUnreachableInst(UnreachableInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitCleanupReturnInst(CleanupReturnInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitCatchReturnInst(CatchReturnInst &I) { DELEGATE(TerminatorInst); }
+ RetTy visitCatchSwitchInst(CatchSwitchInst &I) { DELEGATE(TerminatorInst);}
+ RetTy visitICmpInst(ICmpInst &I) { DELEGATE(CmpInst);}
+ RetTy visitFCmpInst(FCmpInst &I) { DELEGATE(CmpInst);}
+ RetTy visitAllocaInst(AllocaInst &I) { DELEGATE(UnaryInstruction);}
+ RetTy visitLoadInst(LoadInst &I) { DELEGATE(UnaryInstruction);}
+ RetTy visitStoreInst(StoreInst &I) { DELEGATE(Instruction);}
+ RetTy visitAtomicCmpXchgInst(AtomicCmpXchgInst &I) { DELEGATE(Instruction);}
+ RetTy visitAtomicRMWInst(AtomicRMWInst &I) { DELEGATE(Instruction);}
+ RetTy visitFenceInst(FenceInst &I) { DELEGATE(Instruction);}
+ RetTy visitGetElementPtrInst(GetElementPtrInst &I){ DELEGATE(Instruction);}
+ RetTy visitPHINode(PHINode &I) { DELEGATE(Instruction);}
+ RetTy visitTruncInst(TruncInst &I) { DELEGATE(CastInst);}
+ RetTy visitZExtInst(ZExtInst &I) { DELEGATE(CastInst);}
+ RetTy visitSExtInst(SExtInst &I) { DELEGATE(CastInst);}
+ RetTy visitFPTruncInst(FPTruncInst &I) { DELEGATE(CastInst);}
+ RetTy visitFPExtInst(FPExtInst &I) { DELEGATE(CastInst);}
+ RetTy visitFPToUIInst(FPToUIInst &I) { DELEGATE(CastInst);}
+ RetTy visitFPToSIInst(FPToSIInst &I) { DELEGATE(CastInst);}
+ RetTy visitUIToFPInst(UIToFPInst &I) { DELEGATE(CastInst);}
+ RetTy visitSIToFPInst(SIToFPInst &I) { DELEGATE(CastInst);}
+ RetTy visitPtrToIntInst(PtrToIntInst &I) { DELEGATE(CastInst);}
+ RetTy visitIntToPtrInst(IntToPtrInst &I) { DELEGATE(CastInst);}
+ RetTy visitBitCastInst(BitCastInst &I) { DELEGATE(CastInst);}
+ RetTy visitAddrSpaceCastInst(AddrSpaceCastInst &I) { DELEGATE(CastInst);}
+ RetTy visitSelectInst(SelectInst &I) { DELEGATE(Instruction);}
+ RetTy visitVAArgInst(VAArgInst &I) { DELEGATE(UnaryInstruction);}
+ RetTy visitExtractElementInst(ExtractElementInst &I) { DELEGATE(Instruction);}
+ RetTy visitInsertElementInst(InsertElementInst &I) { DELEGATE(Instruction);}
+ RetTy visitShuffleVectorInst(ShuffleVectorInst &I) { DELEGATE(Instruction);}
+ RetTy visitExtractValueInst(ExtractValueInst &I){ DELEGATE(UnaryInstruction);}
+ RetTy visitInsertValueInst(InsertValueInst &I) { DELEGATE(Instruction); }
+ RetTy visitLandingPadInst(LandingPadInst &I) { DELEGATE(Instruction); }
+ RetTy visitFuncletPadInst(FuncletPadInst &I) { DELEGATE(Instruction); }
+ RetTy visitCleanupPadInst(CleanupPadInst &I) { DELEGATE(FuncletPadInst); }
+ RetTy visitCatchPadInst(CatchPadInst &I) { DELEGATE(FuncletPadInst); }
+
+ // Handle the special instrinsic instruction classes.
+ RetTy visitDbgDeclareInst(DbgDeclareInst &I) { DELEGATE(DbgInfoIntrinsic);}
+ RetTy visitDbgValueInst(DbgValueInst &I) { DELEGATE(DbgInfoIntrinsic);}
+ RetTy visitDbgInfoIntrinsic(DbgInfoIntrinsic &I) { DELEGATE(IntrinsicInst); }
+ RetTy visitMemSetInst(MemSetInst &I) { DELEGATE(MemIntrinsic); }
+ RetTy visitMemCpyInst(MemCpyInst &I) { DELEGATE(MemTransferInst); }
+ RetTy visitMemMoveInst(MemMoveInst &I) { DELEGATE(MemTransferInst); }
+ RetTy visitMemTransferInst(MemTransferInst &I) { DELEGATE(MemIntrinsic); }
+ RetTy visitMemIntrinsic(MemIntrinsic &I) { DELEGATE(IntrinsicInst); }
+ RetTy visitVAStartInst(VAStartInst &I) { DELEGATE(IntrinsicInst); }
+ RetTy visitVAEndInst(VAEndInst &I) { DELEGATE(IntrinsicInst); }
+ RetTy visitVACopyInst(VACopyInst &I) { DELEGATE(IntrinsicInst); }
+ RetTy visitIntrinsicInst(IntrinsicInst &I) { DELEGATE(CallInst); }
+
+ // Call and Invoke are slightly different as they delegate first through
+ // a generic CallSite visitor.
+ RetTy visitCallInst(CallInst &I) {
+ return static_cast<SubClass*>(this)->visitCallSite(&I);
+ }
+ RetTy visitInvokeInst(InvokeInst &I) {
+ return static_cast<SubClass*>(this)->visitCallSite(&I);
+ }
+
+ // Next level propagators: If the user does not overload a specific
+ // instruction type, they can overload one of these to get the whole class
+ // of instructions...
+ //
+ RetTy visitCastInst(CastInst &I) { DELEGATE(UnaryInstruction);}
+ RetTy visitBinaryOperator(BinaryOperator &I) { DELEGATE(Instruction);}
+ RetTy visitCmpInst(CmpInst &I) { DELEGATE(Instruction);}
+ RetTy visitTerminatorInst(TerminatorInst &I) { DELEGATE(Instruction);}
+ RetTy visitUnaryInstruction(UnaryInstruction &I){ DELEGATE(Instruction);}
+
+ // Provide a special visitor for a 'callsite' that visits both calls and
+ // invokes. When unimplemented, properly delegates to either the terminator or
+ // regular instruction visitor.
+ RetTy visitCallSite(CallSite CS) {
+ assert(CS);
+ Instruction &I = *CS.getInstruction();
+ if (CS.isCall())
+ DELEGATE(Instruction);
+
+ assert(CS.isInvoke());
+ DELEGATE(TerminatorInst);
+ }
+
+ // If the user wants a 'default' case, they can choose to override this
+ // function. If this function is not overloaded in the user's subclass, then
+ // this instruction just gets ignored.
+ //
+ // Note that you MUST override this function if your return type is not void.
+ //
+ void visitInstruction(Instruction &I) {} // Ignore unhandled instructions
+
+private:
+ // Special helper function to delegate to CallInst subclass visitors.
+ RetTy delegateCallInst(CallInst &I) {
+ if (const Function *F = I.getCalledFunction()) {
+ switch (F->getIntrinsicID()) {
+ default: DELEGATE(IntrinsicInst);
+ case Intrinsic::dbg_declare: DELEGATE(DbgDeclareInst);
+ case Intrinsic::dbg_value: DELEGATE(DbgValueInst);
+ case Intrinsic::memcpy: DELEGATE(MemCpyInst);
+ case Intrinsic::memmove: DELEGATE(MemMoveInst);
+ case Intrinsic::memset: DELEGATE(MemSetInst);
+ case Intrinsic::vastart: DELEGATE(VAStartInst);
+ case Intrinsic::vaend: DELEGATE(VAEndInst);
+ case Intrinsic::vacopy: DELEGATE(VACopyInst);
+ case Intrinsic::not_intrinsic: break;
+ }
+ }
+ DELEGATE(CallInst);
+ }
+
+ // An overload that will never actually be called, it is used only from dead
+ // code in the dispatching from opcodes to instruction subclasses.
+ RetTy delegateCallInst(Instruction &I) {
+ llvm_unreachable("delegateCallInst called for non-CallInst");
+ }
+};
+
+#undef DELEGATE
+
+} // End llvm namespace
+
+#endif