//===- llvm/Support/InstVisitor.h - Define instruction visitors -*- 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 template class is used to define instruction visitors in a typesafe
-// manner without having to use lots of casts and a big switch statement (in
-// your code that is). The win here is that if instructions are added in the
-// future, they will be added to the InstVisitor<T> class, allowing you to
-// automatically support them (if you handle on of their superclasses).
-//
-// Note that this library 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.
-//
-// InstVisitor Usage:
-// You define InstVisitors from inheriting from the InstVisitor base class
-// and "overriding" functions in your class. I say "overriding" because this
-// class is defined in terms of statically resolved overloading, not virtual
-// functions. As an 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 CountMallocVisitor : public InstVisitor<CountMallocVisitor> {
-// unsigned Count;
-// CountMallocVisitor() : Count(0) {}
//
-// void visitMallocInst(MallocInst *MI) { ++Count; }
-// };
-//
-// And this class would be used like this:
-// CountMallocVistor CMV;
-// CMV.visit(function);
-// NumMallocs = CMV.Count;
+// The LLVM Compiler Infrastructure
//
-// Returning a value from the visitation function:
-// The InstVisitor class takes an optional second template argument that
-// specifies what type the instruction visitation functions should return. If
-// you specify this, you *MUST* provide an implementation of visitInstruction
-// though!.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
+
#ifndef LLVM_SUPPORT_INSTVISITOR_H
#define LLVM_SUPPORT_INSTVISITOR_H
#include "llvm/Function.h"
#include "llvm/Instructions.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
+#include "llvm/Support/CallSite.h"
+#include "llvm/Support/ErrorHandling.h"
namespace llvm {
#define HANDLE_INST(NUM, OPCODE, CLASS) class CLASS;
#include "llvm/Instruction.def"
-// Forward declare the intermediate types...
-class TerminatorInst; class BinaryOperator;
-class AllocationInst;
-
#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 {
//===--------------------------------------------------------------------===//
//
RetTy visit(Instruction &I) {
switch (I.getOpcode()) {
- default: assert(0 && "Unknown instruction type encountered!");
- abort();
+ 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 \
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.
//
- // The one problem case we have to handle here though is that the PHINode
- // class and opcode name are the exact same. Because of this, we cannot
- // define visitPHINode (the inst version) to forward to visitPHINode (the
- // generic version) without multiply defined symbols and recursion. To handle
- // this, we do not autoexpand "Other" instructions, we do it manually.
- //
+ // 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) { DELEGATE(CLASS); }
+ RetTy visit##OPCODE(CLASS &I) { \
+ if (NUM == Instruction::Call) \
+ return delegateCallInst(I); \
+ else \
+ DELEGATE(CLASS); \
+ }
#include "llvm/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 visitInvokeInst(InvokeInst &I) { DELEGATE(TerminatorInst);}
- RetTy visitUnwindInst(UnwindInst &I) { DELEGATE(TerminatorInst);}
- RetTy visitUnreachableInst(UnreachableInst &I) { DELEGATE(TerminatorInst);}
- RetTy visitSetCondInst(SetCondInst &I) { DELEGATE(BinaryOperator);}
- RetTy visitMallocInst(MallocInst &I) { DELEGATE(AllocationInst);}
- RetTy visitAllocaInst(AllocaInst &I) { DELEGATE(AllocationInst);}
- RetTy visitFreeInst(FreeInst &I) { DELEGATE(Instruction); }
- RetTy visitLoadInst(LoadInst &I) { DELEGATE(Instruction); }
- RetTy visitStoreInst(StoreInst &I) { DELEGATE(Instruction); }
- RetTy visitGetElementPtrInst(GetElementPtrInst &I){ DELEGATE(Instruction); }
- RetTy visitPHINode(PHINode &I) { DELEGATE(Instruction); }
- RetTy visitCastInst(CastInst &I) { DELEGATE(Instruction); }
- RetTy visitSelectInst(SelectInst &I) { DELEGATE(Instruction); }
- RetTy visitCallInst(CallInst &I) { DELEGATE(Instruction); }
- RetTy visitShiftInst(ShiftInst &I) { DELEGATE(Instruction); }
- RetTy visitVANextInst(VANextInst &I) { DELEGATE(Instruction); }
- RetTy visitVAArgInst(VAArgInst &I) { DELEGATE(Instruction); }
-
- // Next level propagators... if the user does not overload a specific
+ 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 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 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); }
+
+ // 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 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 visitTerminatorInst(TerminatorInst &I) { DELEGATE(Instruction); }
- RetTy visitBinaryOperator(BinaryOperator &I) { DELEGATE(Instruction); }
- RetTy visitAllocationInst(AllocationInst &I) { DELEGATE(Instruction); }
+ 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 users subclass, then
+ // 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 ((Intrinsic::ID)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::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
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