1 //===- llvm/Function.h - Class to represent a single function ---*- 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 contains the declaration of the Function class, which represents a
11 // single function/procedure in LLVM.
13 // A function basically consists of a list of basic blocks, a list of arguments,
14 // and a symbol table.
16 //===----------------------------------------------------------------------===//
18 #ifndef LLVM_IR_FUNCTION_H
19 #define LLVM_IR_FUNCTION_H
21 #include "llvm/ADT/DenseSet.h"
22 #include "llvm/ADT/StringRef.h"
23 #include "llvm/ADT/Twine.h"
24 #include "llvm/ADT/ilist_node.h"
25 #include "llvm/ADT/iterator_range.h"
26 #include "llvm/IR/Argument.h"
27 #include "llvm/IR/Attributes.h"
28 #include "llvm/IR/BasicBlock.h"
29 #include "llvm/IR/CallingConv.h"
30 #include "llvm/IR/DerivedTypes.h"
31 #include "llvm/IR/GlobalObject.h"
32 #include "llvm/IR/GlobalValue.h"
33 #include "llvm/IR/OperandTraits.h"
34 #include "llvm/IR/SymbolTableListTraits.h"
35 #include "llvm/IR/Value.h"
36 #include "llvm/Support/Casting.h"
37 #include "llvm/Support/Compiler.h"
50 class AssemblyAnnotationWriter;
55 template <typename T> class Optional;
60 class Function : public GlobalObject, public ilist_node<Function> {
62 using BasicBlockListType = SymbolTableList<BasicBlock>;
64 // BasicBlock iterators...
65 using iterator = BasicBlockListType::iterator;
66 using const_iterator = BasicBlockListType::const_iterator;
68 using arg_iterator = Argument *;
69 using const_arg_iterator = const Argument *;
72 // Important things that make up a function!
73 BasicBlockListType BasicBlocks; ///< The basic blocks
74 mutable Argument *Arguments = nullptr; ///< The formal arguments
76 std::unique_ptr<ValueSymbolTable>
77 SymTab; ///< Symbol table of args/instructions
78 AttributeList AttributeSets; ///< Parameter attributes
83 * bit 0 : HasLazyArguments
84 * bit 1 : HasPrefixData
85 * bit 2 : HasPrologueData
86 * bit 3 : HasPersonalityFn
87 * bits 4-13 : CallingConvention
89 * bits 15 : [reserved]
92 /// Bits from GlobalObject::GlobalObjectSubclassData.
94 /// Whether this function is materializable.
95 IsMaterializableBit = 0,
98 friend class SymbolTableListTraits<Function>;
100 /// hasLazyArguments/CheckLazyArguments - The argument list of a function is
101 /// built on demand, so that the list isn't allocated until the first client
102 /// needs it. The hasLazyArguments predicate returns true if the arg list
103 /// hasn't been set up yet.
105 bool hasLazyArguments() const {
106 return getSubclassDataFromValue() & (1<<0);
110 void CheckLazyArguments() const {
111 if (hasLazyArguments())
112 BuildLazyArguments();
115 void BuildLazyArguments() const;
117 void clearArguments();
119 /// Function ctor - If the (optional) Module argument is specified, the
120 /// function is automatically inserted into the end of the function list for
123 Function(FunctionType *Ty, LinkageTypes Linkage,
124 const Twine &N = "", Module *M = nullptr);
127 Function(const Function&) = delete;
128 void operator=(const Function&) = delete;
131 // This is here to help easily convert from FunctionT * (Function * or
132 // MachineFunction *) in BlockFrequencyInfoImpl to Function * by calling
133 // FunctionT->getFunction().
134 const Function &getFunction() const { return *this; }
136 static Function *Create(FunctionType *Ty, LinkageTypes Linkage,
137 const Twine &N = "", Module *M = nullptr) {
138 return new Function(Ty, Linkage, N, M);
141 // Provide fast operand accessors.
142 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
144 /// Returns the number of non-debug IR instructions in this function.
145 /// This is equivalent to the sum of the sizes of each basic block contained
146 /// within this function.
147 unsigned getInstructionCount();
149 /// Returns the FunctionType for me.
150 FunctionType *getFunctionType() const {
151 return cast<FunctionType>(getValueType());
154 /// Returns the type of the ret val.
155 Type *getReturnType() const { return getFunctionType()->getReturnType(); }
157 /// getContext - Return a reference to the LLVMContext associated with this
159 LLVMContext &getContext() const;
161 /// isVarArg - Return true if this function takes a variable number of
163 bool isVarArg() const { return getFunctionType()->isVarArg(); }
165 bool isMaterializable() const {
166 return getGlobalObjectSubClassData() & (1 << IsMaterializableBit);
168 void setIsMaterializable(bool V) {
169 unsigned Mask = 1 << IsMaterializableBit;
170 setGlobalObjectSubClassData((~Mask & getGlobalObjectSubClassData()) |
174 /// getIntrinsicID - This method returns the ID number of the specified
175 /// function, or Intrinsic::not_intrinsic if the function is not an
176 /// intrinsic, or if the pointer is null. This value is always defined to be
177 /// zero to allow easy checking for whether a function is intrinsic or not.
178 /// The particular intrinsic functions which correspond to this value are
179 /// defined in llvm/Intrinsics.h.
180 Intrinsic::ID getIntrinsicID() const LLVM_READONLY { return IntID; }
182 /// isIntrinsic - Returns true if the function's name starts with "llvm.".
183 /// It's possible for this function to return true while getIntrinsicID()
184 /// returns Intrinsic::not_intrinsic!
185 bool isIntrinsic() const { return HasLLVMReservedName; }
187 static Intrinsic::ID lookupIntrinsicID(StringRef Name);
189 /// Recalculate the ID for this function if it is an Intrinsic defined
190 /// in llvm/Intrinsics.h. Sets the intrinsic ID to Intrinsic::not_intrinsic
191 /// if the name of this function does not match an intrinsic in that header.
192 /// Note, this method does not need to be called directly, as it is called
193 /// from Value::setName() whenever the name of this function changes.
194 void recalculateIntrinsicID();
196 /// getCallingConv()/setCallingConv(CC) - These method get and set the
197 /// calling convention of this function. The enum values for the known
198 /// calling conventions are defined in CallingConv.h.
199 CallingConv::ID getCallingConv() const {
200 return static_cast<CallingConv::ID>((getSubclassDataFromValue() >> 4) &
203 void setCallingConv(CallingConv::ID CC) {
204 auto ID = static_cast<unsigned>(CC);
205 assert(!(ID & ~CallingConv::MaxID) && "Unsupported calling convention");
206 setValueSubclassData((getSubclassDataFromValue() & 0xc00f) | (ID << 4));
209 /// Return the attribute list for this Function.
210 AttributeList getAttributes() const { return AttributeSets; }
212 /// Set the attribute list for this Function.
213 void setAttributes(AttributeList Attrs) { AttributeSets = Attrs; }
215 /// Add function attributes to this function.
216 void addFnAttr(Attribute::AttrKind Kind) {
217 addAttribute(AttributeList::FunctionIndex, Kind);
220 /// Add function attributes to this function.
221 void addFnAttr(StringRef Kind, StringRef Val = StringRef()) {
222 addAttribute(AttributeList::FunctionIndex,
223 Attribute::get(getContext(), Kind, Val));
226 /// Add function attributes to this function.
227 void addFnAttr(Attribute Attr) {
228 addAttribute(AttributeList::FunctionIndex, Attr);
231 /// Remove function attributes from this function.
232 void removeFnAttr(Attribute::AttrKind Kind) {
233 removeAttribute(AttributeList::FunctionIndex, Kind);
236 /// Remove function attribute from this function.
237 void removeFnAttr(StringRef Kind) {
238 setAttributes(getAttributes().removeAttribute(
239 getContext(), AttributeList::FunctionIndex, Kind));
242 enum ProfileCountType { PCT_Invalid, PCT_Real, PCT_Synthetic };
244 /// Class to represent profile counts.
246 /// This class represents both real and synthetic profile counts.
250 ProfileCountType PCT;
251 static ProfileCount Invalid;
254 ProfileCount() : Count(-1), PCT(PCT_Invalid) {}
255 ProfileCount(uint64_t Count, ProfileCountType PCT)
256 : Count(Count), PCT(PCT) {}
257 bool hasValue() const { return PCT != PCT_Invalid; }
258 uint64_t getCount() const { return Count; }
259 ProfileCountType getType() const { return PCT; }
260 bool isSynthetic() const { return PCT == PCT_Synthetic; }
261 explicit operator bool() { return hasValue(); }
262 bool operator!() const { return !hasValue(); }
263 // Update the count retaining the same profile count type.
264 ProfileCount &setCount(uint64_t C) {
268 static ProfileCount getInvalid() { return ProfileCount(-1, PCT_Invalid); }
271 /// Set the entry count for this function.
273 /// Entry count is the number of times this function was executed based on
274 /// pgo data. \p Imports points to a set of GUIDs that needs to
275 /// be imported by the function for sample PGO, to enable the same inlines as
276 /// the profiled optimized binary.
277 void setEntryCount(ProfileCount Count,
278 const DenseSet<GlobalValue::GUID> *Imports = nullptr);
280 /// A convenience wrapper for setting entry count
281 void setEntryCount(uint64_t Count, ProfileCountType Type = PCT_Real,
282 const DenseSet<GlobalValue::GUID> *Imports = nullptr);
284 /// Get the entry count for this function.
286 /// Entry count is the number of times the function was executed based on
288 ProfileCount getEntryCount() const;
290 /// Return true if the function is annotated with profile data.
292 /// Presence of entry counts from a profile run implies the function has
293 /// profile annotations.
294 bool hasProfileData() const { return getEntryCount().hasValue(); }
296 /// Returns the set of GUIDs that needs to be imported to the function for
297 /// sample PGO, to enable the same inlines as the profiled optimized binary.
298 DenseSet<GlobalValue::GUID> getImportGUIDs() const;
300 /// Set the section prefix for this function.
301 void setSectionPrefix(StringRef Prefix);
303 /// Get the section prefix for this function.
304 Optional<StringRef> getSectionPrefix() const;
306 /// Return true if the function has the attribute.
307 bool hasFnAttribute(Attribute::AttrKind Kind) const {
308 return AttributeSets.hasFnAttribute(Kind);
311 /// Return true if the function has the attribute.
312 bool hasFnAttribute(StringRef Kind) const {
313 return AttributeSets.hasFnAttribute(Kind);
316 /// Return the attribute for the given attribute kind.
317 Attribute getFnAttribute(Attribute::AttrKind Kind) const {
318 return getAttribute(AttributeList::FunctionIndex, Kind);
321 /// Return the attribute for the given attribute kind.
322 Attribute getFnAttribute(StringRef Kind) const {
323 return getAttribute(AttributeList::FunctionIndex, Kind);
326 /// Return the stack alignment for the function.
327 unsigned getFnStackAlignment() const {
328 if (!hasFnAttribute(Attribute::StackAlignment))
330 return AttributeSets.getStackAlignment(AttributeList::FunctionIndex);
333 /// hasGC/getGC/setGC/clearGC - The name of the garbage collection algorithm
334 /// to use during code generation.
336 return getSubclassDataFromValue() & (1<<14);
338 const std::string &getGC() const;
339 void setGC(std::string Str);
342 /// adds the attribute to the list of attributes.
343 void addAttribute(unsigned i, Attribute::AttrKind Kind);
345 /// adds the attribute to the list of attributes.
346 void addAttribute(unsigned i, Attribute Attr);
348 /// adds the attributes to the list of attributes.
349 void addAttributes(unsigned i, const AttrBuilder &Attrs);
351 /// adds the attribute to the list of attributes for the given arg.
352 void addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
354 /// adds the attribute to the list of attributes for the given arg.
355 void addParamAttr(unsigned ArgNo, Attribute Attr);
357 /// adds the attributes to the list of attributes for the given arg.
358 void addParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs);
360 /// removes the attribute from the list of attributes.
361 void removeAttribute(unsigned i, Attribute::AttrKind Kind);
363 /// removes the attribute from the list of attributes.
364 void removeAttribute(unsigned i, StringRef Kind);
366 /// removes the attributes from the list of attributes.
367 void removeAttributes(unsigned i, const AttrBuilder &Attrs);
369 /// removes the attribute from the list of attributes.
370 void removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
372 /// removes the attribute from the list of attributes.
373 void removeParamAttr(unsigned ArgNo, StringRef Kind);
375 /// removes the attribute from the list of attributes.
376 void removeParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs);
378 /// check if an attributes is in the list of attributes.
379 bool hasAttribute(unsigned i, Attribute::AttrKind Kind) const {
380 return getAttributes().hasAttribute(i, Kind);
383 /// check if an attributes is in the list of attributes.
384 bool hasParamAttribute(unsigned ArgNo, Attribute::AttrKind Kind) const {
385 return getAttributes().hasParamAttribute(ArgNo, Kind);
388 /// gets the attribute from the list of attributes.
389 Attribute getAttribute(unsigned i, Attribute::AttrKind Kind) const {
390 return AttributeSets.getAttribute(i, Kind);
393 /// gets the attribute from the list of attributes.
394 Attribute getAttribute(unsigned i, StringRef Kind) const {
395 return AttributeSets.getAttribute(i, Kind);
398 /// adds the dereferenceable attribute to the list of attributes.
399 void addDereferenceableAttr(unsigned i, uint64_t Bytes);
401 /// adds the dereferenceable attribute to the list of attributes for
403 void addDereferenceableParamAttr(unsigned ArgNo, uint64_t Bytes);
405 /// adds the dereferenceable_or_null attribute to the list of
407 void addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes);
409 /// adds the dereferenceable_or_null attribute to the list of
410 /// attributes for the given arg.
411 void addDereferenceableOrNullParamAttr(unsigned ArgNo, uint64_t Bytes);
413 /// Extract the alignment for a call or parameter (0=unknown).
414 unsigned getParamAlignment(unsigned ArgNo) const {
415 return AttributeSets.getParamAlignment(ArgNo);
418 /// Extract the number of dereferenceable bytes for a call or
419 /// parameter (0=unknown).
420 /// @param i AttributeList index, referring to a return value or argument.
421 uint64_t getDereferenceableBytes(unsigned i) const {
422 return AttributeSets.getDereferenceableBytes(i);
425 /// Extract the number of dereferenceable bytes for a parameter.
426 /// @param ArgNo Index of an argument, with 0 being the first function arg.
427 uint64_t getParamDereferenceableBytes(unsigned ArgNo) const {
428 return AttributeSets.getParamDereferenceableBytes(ArgNo);
431 /// Extract the number of dereferenceable_or_null bytes for a call or
432 /// parameter (0=unknown).
433 /// @param i AttributeList index, referring to a return value or argument.
434 uint64_t getDereferenceableOrNullBytes(unsigned i) const {
435 return AttributeSets.getDereferenceableOrNullBytes(i);
438 /// Extract the number of dereferenceable_or_null bytes for a
440 /// @param ArgNo AttributeList ArgNo, referring to an argument.
441 uint64_t getParamDereferenceableOrNullBytes(unsigned ArgNo) const {
442 return AttributeSets.getParamDereferenceableOrNullBytes(ArgNo);
445 /// Determine if the function does not access memory.
446 bool doesNotAccessMemory() const {
447 return hasFnAttribute(Attribute::ReadNone);
449 void setDoesNotAccessMemory() {
450 addFnAttr(Attribute::ReadNone);
453 /// Determine if the function does not access or only reads memory.
454 bool onlyReadsMemory() const {
455 return doesNotAccessMemory() || hasFnAttribute(Attribute::ReadOnly);
457 void setOnlyReadsMemory() {
458 addFnAttr(Attribute::ReadOnly);
461 /// Determine if the function does not access or only writes memory.
462 bool doesNotReadMemory() const {
463 return doesNotAccessMemory() || hasFnAttribute(Attribute::WriteOnly);
465 void setDoesNotReadMemory() {
466 addFnAttr(Attribute::WriteOnly);
469 /// Determine if the call can access memmory only using pointers based
470 /// on its arguments.
471 bool onlyAccessesArgMemory() const {
472 return hasFnAttribute(Attribute::ArgMemOnly);
474 void setOnlyAccessesArgMemory() { addFnAttr(Attribute::ArgMemOnly); }
476 /// Determine if the function may only access memory that is
477 /// inaccessible from the IR.
478 bool onlyAccessesInaccessibleMemory() const {
479 return hasFnAttribute(Attribute::InaccessibleMemOnly);
481 void setOnlyAccessesInaccessibleMemory() {
482 addFnAttr(Attribute::InaccessibleMemOnly);
485 /// Determine if the function may only access memory that is
486 /// either inaccessible from the IR or pointed to by its arguments.
487 bool onlyAccessesInaccessibleMemOrArgMem() const {
488 return hasFnAttribute(Attribute::InaccessibleMemOrArgMemOnly);
490 void setOnlyAccessesInaccessibleMemOrArgMem() {
491 addFnAttr(Attribute::InaccessibleMemOrArgMemOnly);
494 /// Determine if the function cannot return.
495 bool doesNotReturn() const {
496 return hasFnAttribute(Attribute::NoReturn);
498 void setDoesNotReturn() {
499 addFnAttr(Attribute::NoReturn);
502 /// Determine if the function should not perform indirect branch tracking.
503 bool doesNoCfCheck() const { return hasFnAttribute(Attribute::NoCfCheck); }
505 /// Determine if the function cannot unwind.
506 bool doesNotThrow() const {
507 return hasFnAttribute(Attribute::NoUnwind);
509 void setDoesNotThrow() {
510 addFnAttr(Attribute::NoUnwind);
513 /// Determine if the call cannot be duplicated.
514 bool cannotDuplicate() const {
515 return hasFnAttribute(Attribute::NoDuplicate);
517 void setCannotDuplicate() {
518 addFnAttr(Attribute::NoDuplicate);
521 /// Determine if the call is convergent.
522 bool isConvergent() const {
523 return hasFnAttribute(Attribute::Convergent);
525 void setConvergent() {
526 addFnAttr(Attribute::Convergent);
528 void setNotConvergent() {
529 removeFnAttr(Attribute::Convergent);
532 /// Determine if the call has sideeffects.
533 bool isSpeculatable() const {
534 return hasFnAttribute(Attribute::Speculatable);
536 void setSpeculatable() {
537 addFnAttr(Attribute::Speculatable);
540 /// Determine if the function is known not to recurse, directly or
542 bool doesNotRecurse() const {
543 return hasFnAttribute(Attribute::NoRecurse);
545 void setDoesNotRecurse() {
546 addFnAttr(Attribute::NoRecurse);
549 /// True if the ABI mandates (or the user requested) that this
550 /// function be in a unwind table.
551 bool hasUWTable() const {
552 return hasFnAttribute(Attribute::UWTable);
554 void setHasUWTable() {
555 addFnAttr(Attribute::UWTable);
558 /// True if this function needs an unwind table.
559 bool needsUnwindTableEntry() const {
560 return hasUWTable() || !doesNotThrow() || hasPersonalityFn();
563 /// Determine if the function returns a structure through first
564 /// or second pointer argument.
565 bool hasStructRetAttr() const {
566 return AttributeSets.hasParamAttribute(0, Attribute::StructRet) ||
567 AttributeSets.hasParamAttribute(1, Attribute::StructRet);
570 /// Determine if the parameter or return value is marked with NoAlias
572 bool returnDoesNotAlias() const {
573 return AttributeSets.hasAttribute(AttributeList::ReturnIndex,
576 void setReturnDoesNotAlias() {
577 addAttribute(AttributeList::ReturnIndex, Attribute::NoAlias);
580 /// Optimize this function for minimum size (-Oz).
581 bool optForMinSize() const { return hasFnAttribute(Attribute::MinSize); }
583 /// Optimize this function for size (-Os) or minimum size (-Oz).
584 bool optForSize() const {
585 return hasFnAttribute(Attribute::OptimizeForSize) || optForMinSize();
588 /// copyAttributesFrom - copy all additional attributes (those not needed to
589 /// create a Function) from the Function Src to this one.
590 void copyAttributesFrom(const Function *Src);
592 /// deleteBody - This method deletes the body of the function, and converts
593 /// the linkage to external.
597 setLinkage(ExternalLinkage);
600 /// removeFromParent - This method unlinks 'this' from the containing module,
601 /// but does not delete it.
603 void removeFromParent();
605 /// eraseFromParent - This method unlinks 'this' from the containing module
608 void eraseFromParent();
610 /// Steal arguments from another function.
612 /// Drop this function's arguments and splice in the ones from \c Src.
613 /// Requires that this has no function body.
614 void stealArgumentListFrom(Function &Src);
616 /// Get the underlying elements of the Function... the basic block list is
617 /// empty for external functions.
619 const BasicBlockListType &getBasicBlockList() const { return BasicBlocks; }
620 BasicBlockListType &getBasicBlockList() { return BasicBlocks; }
622 static BasicBlockListType Function::*getSublistAccess(BasicBlock*) {
623 return &Function::BasicBlocks;
626 const BasicBlock &getEntryBlock() const { return front(); }
627 BasicBlock &getEntryBlock() { return front(); }
629 //===--------------------------------------------------------------------===//
630 // Symbol Table Accessing functions...
632 /// getSymbolTable() - Return the symbol table if any, otherwise nullptr.
634 inline ValueSymbolTable *getValueSymbolTable() { return SymTab.get(); }
635 inline const ValueSymbolTable *getValueSymbolTable() const {
639 //===--------------------------------------------------------------------===//
640 // BasicBlock iterator forwarding functions
642 iterator begin() { return BasicBlocks.begin(); }
643 const_iterator begin() const { return BasicBlocks.begin(); }
644 iterator end () { return BasicBlocks.end(); }
645 const_iterator end () const { return BasicBlocks.end(); }
647 size_t size() const { return BasicBlocks.size(); }
648 bool empty() const { return BasicBlocks.empty(); }
649 const BasicBlock &front() const { return BasicBlocks.front(); }
650 BasicBlock &front() { return BasicBlocks.front(); }
651 const BasicBlock &back() const { return BasicBlocks.back(); }
652 BasicBlock &back() { return BasicBlocks.back(); }
654 /// @name Function Argument Iteration
657 arg_iterator arg_begin() {
658 CheckLazyArguments();
661 const_arg_iterator arg_begin() const {
662 CheckLazyArguments();
666 arg_iterator arg_end() {
667 CheckLazyArguments();
668 return Arguments + NumArgs;
670 const_arg_iterator arg_end() const {
671 CheckLazyArguments();
672 return Arguments + NumArgs;
675 iterator_range<arg_iterator> args() {
676 return make_range(arg_begin(), arg_end());
678 iterator_range<const_arg_iterator> args() const {
679 return make_range(arg_begin(), arg_end());
684 size_t arg_size() const { return NumArgs; }
685 bool arg_empty() const { return arg_size() == 0; }
687 /// Check whether this function has a personality function.
688 bool hasPersonalityFn() const {
689 return getSubclassDataFromValue() & (1<<3);
692 /// Get the personality function associated with this function.
693 Constant *getPersonalityFn() const;
694 void setPersonalityFn(Constant *Fn);
696 /// Check whether this function has prefix data.
697 bool hasPrefixData() const {
698 return getSubclassDataFromValue() & (1<<1);
701 /// Get the prefix data associated with this function.
702 Constant *getPrefixData() const;
703 void setPrefixData(Constant *PrefixData);
705 /// Check whether this function has prologue data.
706 bool hasPrologueData() const {
707 return getSubclassDataFromValue() & (1<<2);
710 /// Get the prologue data associated with this function.
711 Constant *getPrologueData() const;
712 void setPrologueData(Constant *PrologueData);
714 /// Print the function to an output stream with an optional
715 /// AssemblyAnnotationWriter.
716 void print(raw_ostream &OS, AssemblyAnnotationWriter *AAW = nullptr,
717 bool ShouldPreserveUseListOrder = false,
718 bool IsForDebug = false) const;
720 /// viewCFG - This function is meant for use from the debugger. You can just
721 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
722 /// program, displaying the CFG of the current function with the code for each
723 /// basic block inside. This depends on there being a 'dot' and 'gv' program
726 void viewCFG() const;
728 /// viewCFGOnly - This function is meant for use from the debugger. It works
729 /// just like viewCFG, but it does not include the contents of basic blocks
730 /// into the nodes, just the label. If you are only interested in the CFG
731 /// this can make the graph smaller.
733 void viewCFGOnly() const;
735 /// Methods for support type inquiry through isa, cast, and dyn_cast:
736 static bool classof(const Value *V) {
737 return V->getValueID() == Value::FunctionVal;
740 /// dropAllReferences() - This method causes all the subinstructions to "let
741 /// go" of all references that they are maintaining. This allows one to
742 /// 'delete' a whole module at a time, even though there may be circular
743 /// references... first all references are dropped, and all use counts go to
744 /// zero. Then everything is deleted for real. Note that no operations are
745 /// valid on an object that has "dropped all references", except operator
748 /// Since no other object in the module can have references into the body of a
749 /// function, dropping all references deletes the entire body of the function,
750 /// including any contained basic blocks.
752 void dropAllReferences();
754 /// hasAddressTaken - returns true if there are any uses of this function
755 /// other than direct calls or invokes to it, or blockaddress expressions.
756 /// Optionally passes back an offending user for diagnostic purposes.
758 bool hasAddressTaken(const User** = nullptr) const;
760 /// isDefTriviallyDead - Return true if it is trivially safe to remove
761 /// this function definition from the module (because it isn't externally
762 /// visible, does not have its address taken, and has no callers). To make
763 /// this more accurate, call removeDeadConstantUsers first.
764 bool isDefTriviallyDead() const;
766 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
767 /// setjmp or other function that gcc recognizes as "returning twice".
768 bool callsFunctionThatReturnsTwice() const;
770 /// Set the attached subprogram.
772 /// Calls \a setMetadata() with \a LLVMContext::MD_dbg.
773 void setSubprogram(DISubprogram *SP);
775 /// Get the attached subprogram.
777 /// Calls \a getMetadata() with \a LLVMContext::MD_dbg and casts the result
778 /// to \a DISubprogram.
779 DISubprogram *getSubprogram() const;
781 /// Returns true if we should emit debug info for profiling.
782 bool isDebugInfoForProfiling() const;
784 /// Check if null pointer dereferencing is considered undefined behavior for
786 /// Return value: false => null pointer dereference is undefined.
787 /// Return value: true => null pointer dereference is not undefined.
788 bool nullPointerIsDefined() const;
791 void allocHungoffUselist();
792 template<int Idx> void setHungoffOperand(Constant *C);
794 /// Shadow Value::setValueSubclassData with a private forwarding method so
795 /// that subclasses cannot accidentally use it.
796 void setValueSubclassData(unsigned short D) {
797 Value::setValueSubclassData(D);
799 void setValueSubclassDataBit(unsigned Bit, bool On);
802 /// Check whether null pointer dereferencing is considered undefined behavior
803 /// for a given function or an address space.
804 /// Null pointer access in non-zero address space is not considered undefined.
805 /// Return value: false => null pointer dereference is undefined.
806 /// Return value: true => null pointer dereference is not undefined.
807 bool NullPointerIsDefined(const Function *F, unsigned AS = 0);
810 struct OperandTraits<Function> : public HungoffOperandTraits<3> {};
812 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(Function, Value)
814 } // end namespace llvm
816 #endif // LLVM_IR_FUNCTION_H