1 //===- CallSite.h - Abstract Call & Invoke instrs ---------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the CallSite class, which is a handy wrapper for code that
11 // wants to treat Call and Invoke instructions in a generic way. When in non-
12 // mutation context (e.g. an analysis) ImmutableCallSite should be used.
13 // Finally, when some degree of customization is necessary between these two
14 // extremes, CallSiteBase<> can be supplied with fine-tuned parameters.
16 // NOTE: These classes are supposed to have "value semantics". So they should be
17 // passed by value, not by reference; they should not be "new"ed or "delete"d.
18 // They are efficiently copyable, assignable and constructable, with cost
19 // equivalent to copying a pointer (notice that they have only a single data
20 // member). The internal representation carries a flag which indicates which of
21 // the two variants is enclosed. This allows for cheaper checks when various
22 // accessors of CallSite are employed.
24 //===----------------------------------------------------------------------===//
26 #ifndef LLVM_IR_CALLSITE_H
27 #define LLVM_IR_CALLSITE_H
29 #include "llvm/ADT/PointerIntPair.h"
30 #include "llvm/IR/Attributes.h"
31 #include "llvm/IR/CallingConv.h"
32 #include "llvm/IR/Instructions.h"
39 template <typename FunTy = const Function,
40 typename ValTy = const Value,
41 typename UserTy = const User,
42 typename InstrTy = const Instruction,
43 typename CallTy = const CallInst,
44 typename InvokeTy = const InvokeInst,
45 typename IterTy = User::const_op_iterator>
48 PointerIntPair<InstrTy*, 1, bool> I;
50 CallSiteBase() : I(nullptr, false) {}
51 CallSiteBase(CallTy *CI) : I(CI, true) { assert(CI); }
52 CallSiteBase(InvokeTy *II) : I(II, false) { assert(II); }
53 CallSiteBase(ValTy *II) { *this = get(II); }
55 /// CallSiteBase::get - This static method is sort of like a constructor. It
56 /// will create an appropriate call site for a Call or Invoke instruction, but
57 /// it can also create a null initialized CallSiteBase object for something
58 /// which is NOT a call site.
60 static CallSiteBase get(ValTy *V) {
61 if (InstrTy *II = dyn_cast<InstrTy>(V)) {
62 if (II->getOpcode() == Instruction::Call)
63 return CallSiteBase(static_cast<CallTy*>(II));
64 else if (II->getOpcode() == Instruction::Invoke)
65 return CallSiteBase(static_cast<InvokeTy*>(II));
67 return CallSiteBase();
70 /// isCall - true if a CallInst is enclosed.
71 /// Note that !isCall() does not mean it is an InvokeInst enclosed,
72 /// it also could signify a NULL Instruction pointer.
73 bool isCall() const { return I.getInt(); }
75 /// isInvoke - true if a InvokeInst is enclosed.
77 bool isInvoke() const { return getInstruction() && !I.getInt(); }
79 InstrTy *getInstruction() const { return I.getPointer(); }
80 InstrTy *operator->() const { return I.getPointer(); }
81 LLVM_EXPLICIT operator bool() const { return I.getPointer(); }
83 /// getCalledValue - Return the pointer to function that is being called.
85 ValTy *getCalledValue() const {
86 assert(getInstruction() && "Not a call or invoke instruction!");
90 /// getCalledFunction - Return the function being called if this is a direct
91 /// call, otherwise return null (if it's an indirect call).
93 FunTy *getCalledFunction() const {
94 return dyn_cast<FunTy>(getCalledValue());
97 /// setCalledFunction - Set the callee to the specified value.
99 void setCalledFunction(Value *V) {
100 assert(getInstruction() && "Not a call or invoke instruction!");
104 /// isCallee - Determine whether the passed iterator points to the
105 /// callee operand's Use.
106 bool isCallee(Value::const_user_iterator UI) const {
107 return isCallee(&UI.getUse());
110 /// Determine whether this Use is the callee operand's Use.
111 bool isCallee(const Use *U) const { return getCallee() == U; }
113 ValTy *getArgument(unsigned ArgNo) const {
114 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
115 return *(arg_begin() + ArgNo);
118 void setArgument(unsigned ArgNo, Value* newVal) {
119 assert(getInstruction() && "Not a call or invoke instruction!");
120 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
121 getInstruction()->setOperand(ArgNo, newVal);
124 /// Given a value use iterator, returns the argument that corresponds to it.
125 /// Iterator must actually correspond to an argument.
126 unsigned getArgumentNo(Value::const_user_iterator I) const {
127 return getArgumentNo(&I.getUse());
130 /// Given a use for an argument, get the argument number that corresponds to
132 unsigned getArgumentNo(const Use *U) const {
133 assert(getInstruction() && "Not a call or invoke instruction!");
134 assert(arg_begin() <= U && U < arg_end()
135 && "Argument # out of range!");
136 return U - arg_begin();
139 /// arg_iterator - The type of iterator to use when looping over actual
140 /// arguments at this call site.
141 typedef IterTy arg_iterator;
143 /// arg_begin/arg_end - Return iterators corresponding to the actual argument
144 /// list for a call site.
145 IterTy arg_begin() const {
146 assert(getInstruction() && "Not a call or invoke instruction!");
147 // Skip non-arguments
148 return (*this)->op_begin();
151 IterTy arg_end() const { return (*this)->op_end() - getArgumentEndOffset(); }
152 bool arg_empty() const { return arg_end() == arg_begin(); }
153 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
155 /// getType - Return the type of the instruction that generated this call site
157 Type *getType() const { return (*this)->getType(); }
159 /// getCaller - Return the caller function for this call site
161 FunTy *getCaller() const { return (*this)->getParent()->getParent(); }
163 /// \brief Tests if this call site must be tail call optimized. Only a
164 /// CallInst can be tail call optimized.
165 bool isMustTailCall() const {
166 return isCall() && cast<CallInst>(getInstruction())->isMustTailCall();
169 #define CALLSITE_DELEGATE_GETTER(METHOD) \
170 InstrTy *II = getInstruction(); \
172 ? cast<CallInst>(II)->METHOD \
173 : cast<InvokeInst>(II)->METHOD
175 #define CALLSITE_DELEGATE_SETTER(METHOD) \
176 InstrTy *II = getInstruction(); \
178 cast<CallInst>(II)->METHOD; \
180 cast<InvokeInst>(II)->METHOD
182 /// getCallingConv/setCallingConv - get or set the calling convention of the
184 CallingConv::ID getCallingConv() const {
185 CALLSITE_DELEGATE_GETTER(getCallingConv());
187 void setCallingConv(CallingConv::ID CC) {
188 CALLSITE_DELEGATE_SETTER(setCallingConv(CC));
191 /// getAttributes/setAttributes - get or set the parameter attributes of
193 const AttributeSet &getAttributes() const {
194 CALLSITE_DELEGATE_GETTER(getAttributes());
196 void setAttributes(const AttributeSet &PAL) {
197 CALLSITE_DELEGATE_SETTER(setAttributes(PAL));
200 /// \brief Return true if this function has the given attribute.
201 bool hasFnAttr(Attribute::AttrKind A) const {
202 CALLSITE_DELEGATE_GETTER(hasFnAttr(A));
205 /// \brief Return true if the call or the callee has the given attribute.
206 bool paramHasAttr(unsigned i, Attribute::AttrKind A) const {
207 CALLSITE_DELEGATE_GETTER(paramHasAttr(i, A));
210 /// @brief Extract the alignment for a call or parameter (0=unknown).
211 uint16_t getParamAlignment(uint16_t i) const {
212 CALLSITE_DELEGATE_GETTER(getParamAlignment(i));
215 /// \brief Return true if the call should not be treated as a call to a
217 bool isNoBuiltin() const {
218 CALLSITE_DELEGATE_GETTER(isNoBuiltin());
221 /// @brief Return true if the call should not be inlined.
222 bool isNoInline() const {
223 CALLSITE_DELEGATE_GETTER(isNoInline());
225 void setIsNoInline(bool Value = true) {
226 CALLSITE_DELEGATE_SETTER(setIsNoInline(Value));
229 /// @brief Determine if the call does not access memory.
230 bool doesNotAccessMemory() const {
231 CALLSITE_DELEGATE_GETTER(doesNotAccessMemory());
233 void setDoesNotAccessMemory() {
234 CALLSITE_DELEGATE_SETTER(setDoesNotAccessMemory());
237 /// @brief Determine if the call does not access or only reads memory.
238 bool onlyReadsMemory() const {
239 CALLSITE_DELEGATE_GETTER(onlyReadsMemory());
241 void setOnlyReadsMemory() {
242 CALLSITE_DELEGATE_SETTER(setOnlyReadsMemory());
245 /// @brief Determine if the call cannot return.
246 bool doesNotReturn() const {
247 CALLSITE_DELEGATE_GETTER(doesNotReturn());
249 void setDoesNotReturn() {
250 CALLSITE_DELEGATE_SETTER(setDoesNotReturn());
253 /// @brief Determine if the call cannot unwind.
254 bool doesNotThrow() const {
255 CALLSITE_DELEGATE_GETTER(doesNotThrow());
257 void setDoesNotThrow() {
258 CALLSITE_DELEGATE_SETTER(setDoesNotThrow());
261 #undef CALLSITE_DELEGATE_GETTER
262 #undef CALLSITE_DELEGATE_SETTER
264 /// @brief Determine whether this argument is not captured.
265 bool doesNotCapture(unsigned ArgNo) const {
266 return paramHasAttr(ArgNo + 1, Attribute::NoCapture);
269 /// @brief Determine whether this argument is passed by value.
270 bool isByValArgument(unsigned ArgNo) const {
271 return paramHasAttr(ArgNo + 1, Attribute::ByVal);
274 /// @brief Determine whether this argument is passed in an alloca.
275 bool isInAllocaArgument(unsigned ArgNo) const {
276 return paramHasAttr(ArgNo + 1, Attribute::InAlloca);
279 /// @brief Determine whether this argument is passed by value or in an alloca.
280 bool isByValOrInAllocaArgument(unsigned ArgNo) const {
281 return paramHasAttr(ArgNo + 1, Attribute::ByVal) ||
282 paramHasAttr(ArgNo + 1, Attribute::InAlloca);
285 /// @brief Determine if there are is an inalloca argument. Only the last
286 /// argument can have the inalloca attribute.
287 bool hasInAllocaArgument() const {
288 return paramHasAttr(arg_size(), Attribute::InAlloca);
291 bool doesNotAccessMemory(unsigned ArgNo) const {
292 return paramHasAttr(ArgNo + 1, Attribute::ReadNone);
295 bool onlyReadsMemory(unsigned ArgNo) const {
296 return paramHasAttr(ArgNo + 1, Attribute::ReadOnly) ||
297 paramHasAttr(ArgNo + 1, Attribute::ReadNone);
300 /// hasArgument - Returns true if this CallSite passes the given Value* as an
301 /// argument to the called function.
302 bool hasArgument(const Value *Arg) const {
303 for (arg_iterator AI = this->arg_begin(), E = this->arg_end(); AI != E;
305 if (AI->get() == Arg)
311 unsigned getArgumentEndOffset() const {
313 return 1; // Skip Callee
315 return 3; // Skip BB, BB, Callee
318 IterTy getCallee() const {
319 if (isCall()) // Skip Callee
320 return cast<CallInst>(getInstruction())->op_end() - 1;
321 else // Skip BB, BB, Callee
322 return cast<InvokeInst>(getInstruction())->op_end() - 3;
326 class CallSite : public CallSiteBase<Function, Value, User, Instruction,
327 CallInst, InvokeInst, User::op_iterator> {
328 typedef CallSiteBase<Function, Value, User, Instruction,
329 CallInst, InvokeInst, User::op_iterator> Base;
332 CallSite(Base B) : Base(B) {}
333 CallSite(Value* V) : Base(V) {}
334 CallSite(CallInst *CI) : Base(CI) {}
335 CallSite(InvokeInst *II) : Base(II) {}
336 CallSite(Instruction *II) : Base(II) {}
338 bool operator==(const CallSite &CS) const { return I == CS.I; }
339 bool operator!=(const CallSite &CS) const { return I != CS.I; }
340 bool operator<(const CallSite &CS) const {
341 return getInstruction() < CS.getInstruction();
345 User::op_iterator getCallee() const;
348 /// ImmutableCallSite - establish a view to a call site for examination
349 class ImmutableCallSite : public CallSiteBase<> {
350 typedef CallSiteBase<> Base;
352 ImmutableCallSite(const Value* V) : Base(V) {}
353 ImmutableCallSite(const CallInst *CI) : Base(CI) {}
354 ImmutableCallSite(const InvokeInst *II) : Base(II) {}
355 ImmutableCallSite(const Instruction *II) : Base(II) {}
356 ImmutableCallSite(CallSite CS) : Base(CS.getInstruction()) {}
359 } // End llvm namespace