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author | Gabor Greif <ggreif@gmail.com> | 2009-01-11 22:33:22 +0000 |
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committer | Gabor Greif <ggreif@gmail.com> | 2009-01-11 22:33:22 +0000 |
commit | 255b26ea3529ca096313c85dcf006565c7e916f9 (patch) | |
tree | 12c5966bc59cd46bdd5e963520fb52e12e848d80 /include | |
parent | e7886e461b1b1cea421caec6198cc700c2e8d67e (diff) | |
download | external_llvm-255b26ea3529ca096313c85dcf006565c7e916f9.zip external_llvm-255b26ea3529ca096313c85dcf006565c7e916f9.tar.gz external_llvm-255b26ea3529ca096313c85dcf006565c7e916f9.tar.bz2 |
simplify CallSite helper class to not consult the Instruction's
opcode on each delegation.
Instead the information is cached on construction and the cached flag used thereafter.
Introduced two predicates: isCall and isInvoke.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62055 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
-rw-r--r-- | include/llvm/Support/CallSite.h | 59 |
1 files changed, 38 insertions, 21 deletions
diff --git a/include/llvm/Support/CallSite.h b/include/llvm/Support/CallSite.h index 025f9da..544c7d7 100644 --- a/include/llvm/Support/CallSite.h +++ b/include/llvm/Support/CallSite.h @@ -14,15 +14,19 @@ // passed by value, not by reference; it should not be "new"ed or "delete"d. It // is efficiently copyable, assignable and constructable, with cost equivalent // to copying a pointer (notice that it has only a single data member). +// The internal representation carries a flag which indicates which of the two +// variants is enclosed. This allows for cheaper checks when various accessors +// of CallSite are employed. // //===----------------------------------------------------------------------===// #ifndef LLVM_SUPPORT_CALLSITE_H #define LLVM_SUPPORT_CALLSITE_H -#include "llvm/Instruction.h" -#include "llvm/BasicBlock.h" #include "llvm/Attributes.h" +#include "llvm/ADT/PointerIntPair.h" +#include "llvm/BasicBlock.h" +#include "llvm/Instruction.h" namespace llvm { @@ -30,17 +34,19 @@ class CallInst; class InvokeInst; class CallSite { - Instruction *I; + PointerIntPair<Instruction*, 1, bool> I; public: - CallSite() : I(0) {} - CallSite(CallInst *CI) : I(reinterpret_cast<Instruction*>(CI)) {} - CallSite(InvokeInst *II) : I(reinterpret_cast<Instruction*>(II)) {} + CallSite() : I(0, false) {} + CallSite(CallInst *CI) : I(reinterpret_cast<Instruction*>(CI), true) {} + CallSite(InvokeInst *II) : I(reinterpret_cast<Instruction*>(II), false) {} CallSite(Instruction *C); CallSite(const CallSite &CS) : I(CS.I) {} CallSite &operator=(const CallSite &CS) { I = CS.I; return *this; } - bool operator==(const CallSite &CS) const { return I == CS.I; } - bool operator!=(const CallSite &CS) const { return I != CS.I; } + bool operator==(const CallSite &CS) const { return getInstruction() + == CS.getInstruction(); } + bool operator!=(const CallSite &CS) const { return getInstruction() + != CS.getInstruction(); } /// CallSite::get - This static method is sort of like a constructor. It will /// create an appropriate call site for a Call or Invoke instruction, but it @@ -91,21 +97,31 @@ public: /// getType - Return the type of the instruction that generated this call site /// - const Type *getType() const { return I->getType(); } + const Type *getType() const { return getInstruction()->getType(); } + + /// isCall - true if a CallInst is enclosed. + /// Note that !isCall() does not mean it is an InvokeInst enclosed, + /// it also could signify a NULL Instruction pointer. + bool isCall() const { return I.getInt(); } + + /// isInvoke - true if a InvokeInst is enclosed. + /// + bool isInvoke() const { return getInstruction() && !I.getInt(); } /// getInstruction - Return the instruction this call site corresponds to /// - Instruction *getInstruction() const { return I; } + Instruction *getInstruction() const { return I.getPointer(); } /// getCaller - Return the caller function for this call site /// - Function *getCaller() const { return I->getParent()->getParent(); } + Function *getCaller() const { return getInstruction() + ->getParent()->getParent(); } /// getCalledValue - Return the pointer to function that is being called... /// Value *getCalledValue() const { - assert(I && "Not a call or invoke instruction!"); - return I->getOperand(0); + assert(getInstruction() && "Not a call or invoke instruction!"); + return getInstruction()->getOperand(0); } /// getCalledFunction - Return the function being called if this is a direct @@ -118,8 +134,8 @@ public: /// setCalledFunction - Set the callee to the specified value... /// void setCalledFunction(Value *V) { - assert(I && "Not a call or invoke instruction!"); - I->setOperand(0, V); + assert(getInstruction() && "Not a call or invoke instruction!"); + getInstruction()->setOperand(0, V); } Value *getArgument(unsigned ArgNo) const { @@ -128,9 +144,9 @@ public: } void setArgument(unsigned ArgNo, Value* newVal) { - assert(I && "Not a call or invoke instruction!"); + assert(getInstruction() && "Not a call or invoke instruction!"); assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!"); - I->setOperand(getArgumentOffset() + ArgNo, newVal); + getInstruction()->setOperand(getArgumentOffset() + ArgNo, newVal); } /// Given an operand number, returns the argument that corresponds to it. @@ -153,11 +169,12 @@ public: /// arg_begin/arg_end - Return iterators corresponding to the actual argument /// list for a call site. arg_iterator arg_begin() const { - assert(I && "Not a call or invoke instruction!"); - return I->op_begin() + getArgumentOffset(); // Skip non-arguments + assert(getInstruction() && "Not a call or invoke instruction!"); + // Skip non-arguments + return getInstruction()->op_begin() + getArgumentOffset(); } - arg_iterator arg_end() const { return I->op_end(); } + arg_iterator arg_end() const { return getInstruction()->op_end(); } bool arg_empty() const { return arg_end() == arg_begin(); } unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); } @@ -168,7 +185,7 @@ public: private: /// Returns the operand number of the first argument unsigned getArgumentOffset() const { - if (I->getOpcode() == Instruction::Call) + if (isCall()) return 1; // Skip Function else return 3; // Skip Function, BB, BB |