-//===-- llvm/Function.h - Class to represent a single VM function -*- C++ -*-=//
+//===-- llvm/Function.h - Class to represent a single function --*- C++ -*-===//
//
-// This file contains the declaration of the Function class, which represents a
-// single function/procedure in the VM.
+// The LLVM Compiler Infrastructure
//
-// Note that BasicBlock's in the Function are Value's, because they are
-// referenced by instructions like calls and can go into virtual function tables
-// and stuff.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the Function class, which represents a
+// single function/procedure in LLVM.
+//
+// A function basically consists of a list of basic blocks, a list of arguments,
+// and a symbol table.
//
//===----------------------------------------------------------------------===//
#define LLVM_FUNCTION_H
#include "llvm/GlobalValue.h"
-#include "llvm/ValueHolder.h"
+#include "llvm/BasicBlock.h"
+#include "llvm/Argument.h"
+#include "llvm/Support/Annotation.h"
+#include "llvm/ParameterAttributes.h"
+
+namespace llvm {
class FunctionType;
-class Function : public GlobalValue {
+// Traits for intrusive list of instructions...
+template<> struct ilist_traits<BasicBlock>
+ : public SymbolTableListTraits<BasicBlock, Function> {
+
+ // createSentinel is used to create a node that marks the end of the list...
+ static BasicBlock *createSentinel();
+ static void destroySentinel(BasicBlock *BB) { delete BB; }
+ static iplist<BasicBlock> &getList(Function *F);
+ static ValueSymbolTable *getSymTab(Function *ItemParent);
+ static int getListOffset();
+};
+
+template<> struct ilist_traits<Argument>
+ : public SymbolTableListTraits<Argument, Function> {
+
+ // createSentinel is used to create a node that marks the end of the list...
+ static Argument *createSentinel();
+ static void destroySentinel(Argument *A) { delete A; }
+ static iplist<Argument> &getList(Function *F);
+ static ValueSymbolTable *getSymTab(Function *ItemParent);
+ static int getListOffset();
+};
+
+class Function : public GlobalValue, public Annotable,
+ public ilist_node<Function> {
public:
- typedef ValueHolder<Argument , Function, Function> ArgumentListType;
- typedef ValueHolder<BasicBlock, Function, Function> BasicBlocksType;
+ typedef iplist<Argument> ArgumentListType;
+ typedef iplist<BasicBlock> BasicBlockListType;
// BasicBlock iterators...
- typedef BasicBlocksType::iterator iterator;
- typedef BasicBlocksType::const_iterator const_iterator;
- typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
- typedef std::reverse_iterator<iterator> reverse_iterator;
+ typedef BasicBlockListType::iterator iterator;
+ typedef BasicBlockListType::const_iterator const_iterator;
-private:
+ typedef ArgumentListType::iterator arg_iterator;
+ typedef ArgumentListType::const_iterator const_arg_iterator;
+private:
// Important things that make up a function!
- BasicBlocksType BasicBlocks; // The basic blocks
- ArgumentListType ArgumentList; // The formal arguments
+ BasicBlockListType BasicBlocks; ///< The basic blocks
+ mutable ArgumentListType ArgumentList; ///< The formal arguments
+ ValueSymbolTable *SymTab; ///< Symbol table of args/instructions
+ PAListPtr ParamAttrs; ///< Parameter attributes
+
+ // The Calling Convention is stored in Value::SubclassData.
+ /*unsigned CallingConvention;*/
+
+ friend class SymbolTableListTraits<Function, Module>;
- SymbolTable *SymTab, *ParentSymTab;
-
- friend class ValueHolder<Function, Module, Module>;
void setParent(Module *parent);
+ /// hasLazyArguments/CheckLazyArguments - The argument list of a function is
+ /// built on demand, so that the list isn't allocated until the first client
+ /// needs it. The hasLazyArguments predicate returns true if the arg list
+ /// hasn't been set up yet.
+ bool hasLazyArguments() const {
+ return SubclassData & 1;
+ }
+ void CheckLazyArguments() const {
+ if (hasLazyArguments())
+ BuildLazyArguments();
+ }
+ void BuildLazyArguments() const;
+
+ Function(const Function&); // DO NOT IMPLEMENT
+ void operator=(const Function&); // DO NOT IMPLEMENT
+
+ /// Function ctor - If the (optional) Module argument is specified, the
+ /// function is automatically inserted into the end of the function list for
+ /// the module.
+ ///
+ Function(const FunctionType *Ty, LinkageTypes Linkage,
+ const std::string &N = "", Module *M = 0);
+
public:
- Function(const FunctionType *Ty, bool isInternal, const std::string &N = "");
- ~Function();
+ static Function *Create(const FunctionType *Ty, LinkageTypes Linkage,
+ const std::string &N = "", Module *M = 0) {
+ return new(0) Function(Ty, Linkage, N, M);
+ }
- // Specialize setName to handle symbol table majik...
- virtual void setName(const std::string &name, SymbolTable *ST = 0);
+ ~Function();
const Type *getReturnType() const; // Return the type of the ret val
const FunctionType *getFunctionType() const; // Return the FunctionType for me
- // Is the body of this function unknown? (the basic block list is empty if so)
- // this is true for external functions, defined as forward "declare"ations
- bool isExternal() const { return BasicBlocks.empty(); }
+ /// isVarArg - Return true if this function takes a variable number of
+ /// arguments.
+ bool isVarArg() const;
- // Get the underlying elements of the Function... both the argument list and
- // basic block list are empty for external functions.
- //
- inline const ArgumentListType &getArgumentList() const{ return ArgumentList; }
- inline ArgumentListType &getArgumentList() { return ArgumentList; }
+ /// isDeclaration - Is the body of this function unknown? (The basic block
+ /// list is empty if so.) This is true for function declarations, but not
+ /// true for function definitions.
+ ///
+ virtual bool isDeclaration() const { return BasicBlocks.empty(); }
+
+ /// getIntrinsicID - This method returns the ID number of the specified
+ /// function, or Intrinsic::not_intrinsic if the function is not an
+ /// instrinsic, or if the pointer is null. This value is always defined to be
+ /// zero to allow easy checking for whether a function is intrinsic or not.
+ /// The particular intrinsic functions which correspond to this value are
+ /// defined in llvm/Intrinsics.h.
+ ///
+ unsigned getIntrinsicID(bool noAssert = false) const;
+ bool isIntrinsic() const { return getIntrinsicID() != 0; }
+
+ /// getCallingConv()/setCallingConv(uint) - These method get and set the
+ /// calling convention of this function. The enum values for the known
+ /// calling conventions are defined in CallingConv.h.
+ unsigned getCallingConv() const { return SubclassData >> 1; }
+ void setCallingConv(unsigned CC) {
+ SubclassData = (SubclassData & 1) | (CC << 1);
+ }
+
+ /// getParamAttrs - Return the parameter attributes for this Function.
+ ///
+ const PAListPtr &getParamAttrs() const { return ParamAttrs; }
+
+ /// setParamAttrs - Set the parameter attributes for this Function.
+ ///
+ void setParamAttrs(const PAListPtr &attrs) { ParamAttrs = attrs; }
+
+
+ /// hasNote - Return true if this function has given note.
+ bool hasNote(ParameterAttributes N) const {
+ // Notes are stored at ~0 index in parameter attribute list
+ return (!isDeclaration() && paramHasAttr(~0, N));
+ }
+
+ /// setNotes - Set notes for this function
+ ///
+ void setNotes(const ParameterAttributes N) {
+ // Notes are stored at ~0 index in parameter attribute list
+ addParamAttr(~0, N);
+ }
+
+ /// hasGC/getGC/setGC/clearGC - The name of the garbage collection algorithm
+ /// to use during code generation.
+ bool hasGC() const;
+ const char *getGC() const;
+ void setGC(const char *Str);
+ void clearGC();
+
+ /// @brief Determine whether the function has the given attribute.
+ bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
+ return ParamAttrs.paramHasAttr(i, attr);
+ }
+
+ /// addParamAttr - adds the attribute to the list of attributes.
+ void addParamAttr(unsigned i, ParameterAttributes attr);
+
+ /// removeParamAttr - removes the attribute from the list of attributes.
+ void removeParamAttr(unsigned i, ParameterAttributes attr);
+
+ /// @brief Extract the alignment for a call or parameter (0=unknown).
+ unsigned getParamAlignment(unsigned i) const {
+ return ParamAttrs.getParamAlignment(i);
+ }
+
+ /// @brief Determine if the function does not access memory.
+ bool doesNotAccessMemory() const {
+ return paramHasAttr(0, ParamAttr::ReadNone);
+ }
+ void setDoesNotAccessMemory(bool DoesNotAccessMemory = true) {
+ if (DoesNotAccessMemory) addParamAttr(0, ParamAttr::ReadNone);
+ else removeParamAttr(0, ParamAttr::ReadNone);
+ }
- inline const BasicBlocksType &getBasicBlocks() const { return BasicBlocks; }
- inline BasicBlocksType &getBasicBlocks() { return BasicBlocks; }
+ /// @brief Determine if the function does not access or only reads memory.
+ bool onlyReadsMemory() const {
+ return doesNotAccessMemory() || paramHasAttr(0, ParamAttr::ReadOnly);
+ }
+ void setOnlyReadsMemory(bool OnlyReadsMemory = true) {
+ if (OnlyReadsMemory) addParamAttr(0, ParamAttr::ReadOnly);
+ else removeParamAttr(0, ParamAttr::ReadOnly | ParamAttr::ReadNone);
+ }
+
+ /// @brief Determine if the function cannot return.
+ bool doesNotReturn() const {
+ return paramHasAttr(0, ParamAttr::NoReturn);
+ }
+ void setDoesNotReturn(bool DoesNotReturn = true) {
+ if (DoesNotReturn) addParamAttr(0, ParamAttr::NoReturn);
+ else removeParamAttr(0, ParamAttr::NoReturn);
+ }
+
+ /// @brief Determine if the function cannot unwind.
+ bool doesNotThrow() const {
+ return paramHasAttr(0, ParamAttr::NoUnwind);
+ }
+ void setDoesNotThrow(bool DoesNotThrow = true) {
+ if (DoesNotThrow) addParamAttr(0, ParamAttr::NoUnwind);
+ else removeParamAttr(0, ParamAttr::NoUnwind);
+ }
+
+ /// @brief Determine if the function returns a structure through first
+ /// pointer argument.
+ bool hasStructRetAttr() const {
+ return paramHasAttr(1, ParamAttr::StructRet);
+ }
+
+ /// copyAttributesFrom - copy all additional attributes (those not needed to
+ /// create a Function) from the Function Src to this one.
+ void copyAttributesFrom(const GlobalValue *Src);
- inline const BasicBlock *getEntryNode() const { return front(); }
- inline BasicBlock *getEntryNode() { return front(); }
+ /// deleteBody - This method deletes the body of the function, and converts
+ /// the linkage to external.
+ ///
+ void deleteBody() {
+ dropAllReferences();
+ setLinkage(ExternalLinkage);
+ }
+
+ /// removeFromParent - This method unlinks 'this' from the containing module,
+ /// but does not delete it.
+ ///
+ virtual void removeFromParent();
+
+ /// eraseFromParent - This method unlinks 'this' from the containing module
+ /// and deletes it.
+ ///
+ virtual void eraseFromParent();
+
+
+ /// Get the underlying elements of the Function... the basic block list is
+ /// empty for external functions.
+ ///
+ const ArgumentListType &getArgumentList() const {
+ CheckLazyArguments();
+ return ArgumentList;
+ }
+ ArgumentListType &getArgumentList() {
+ CheckLazyArguments();
+ return ArgumentList;
+ }
+
+ const BasicBlockListType &getBasicBlockList() const { return BasicBlocks; }
+ BasicBlockListType &getBasicBlockList() { return BasicBlocks; }
+
+ const BasicBlock &getEntryBlock() const { return front(); }
+ BasicBlock &getEntryBlock() { return front(); }
//===--------------------------------------------------------------------===//
// Symbol Table Accessing functions...
- // hasSymbolTable() - Returns true if there is a symbol table allocated to
- // this object AND if there is at least one name in it!
- //
- bool hasSymbolTable() const;
+ /// getSymbolTable() - Return the symbol table...
+ ///
+ inline ValueSymbolTable &getValueSymbolTable() { return *SymTab; }
+ inline const ValueSymbolTable &getValueSymbolTable() const { return *SymTab; }
- // CAUTION: The current symbol table may be null if there are no names (ie,
- // the symbol table is empty)
- //
- inline SymbolTable *getSymbolTable() { return SymTab; }
- inline const SymbolTable *getSymbolTable() const { return SymTab; }
- // getSymbolTableSure is guaranteed to not return a null pointer, because if
- // the function does not already have a symtab, one is created. Use this if
- // you intend to put something into the symbol table for the function.
+ //===--------------------------------------------------------------------===//
+ // BasicBlock iterator forwarding functions
//
- SymbolTable *getSymbolTableSure(); // Implemented in Value.cpp
+ iterator begin() { return BasicBlocks.begin(); }
+ const_iterator begin() const { return BasicBlocks.begin(); }
+ iterator end () { return BasicBlocks.end(); }
+ const_iterator end () const { return BasicBlocks.end(); }
+
+ size_t size() const { return BasicBlocks.size(); }
+ bool empty() const { return BasicBlocks.empty(); }
+ const BasicBlock &front() const { return BasicBlocks.front(); }
+ BasicBlock &front() { return BasicBlocks.front(); }
+ const BasicBlock &back() const { return BasicBlocks.back(); }
+ BasicBlock &back() { return BasicBlocks.back(); }
-
//===--------------------------------------------------------------------===//
- // BasicBlock iterator forwarding functions
+ // Argument iterator forwarding functions
//
- inline iterator begin() { return BasicBlocks.begin(); }
- inline const_iterator begin() const { return BasicBlocks.begin(); }
- inline iterator end () { return BasicBlocks.end(); }
- inline const_iterator end () const { return BasicBlocks.end(); }
-
- inline reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
- inline const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
- inline reverse_iterator rend () { return BasicBlocks.rend(); }
- inline const_reverse_iterator rend () const { return BasicBlocks.rend(); }
-
- inline unsigned size() const { return BasicBlocks.size(); }
- inline bool empty() const { return BasicBlocks.empty(); }
- inline const BasicBlock *front() const { return BasicBlocks.front(); }
- inline BasicBlock *front() { return BasicBlocks.front(); }
- inline const BasicBlock *back() const { return BasicBlocks.back(); }
- inline BasicBlock *back() { return BasicBlocks.back(); }
-
- virtual void print(std::ostream &OS) const;
-
- // Methods for support type inquiry through isa, cast, and dyn_cast:
+ arg_iterator arg_begin() {
+ CheckLazyArguments();
+ return ArgumentList.begin();
+ }
+ const_arg_iterator arg_begin() const {
+ CheckLazyArguments();
+ return ArgumentList.begin();
+ }
+ arg_iterator arg_end() {
+ CheckLazyArguments();
+ return ArgumentList.end();
+ }
+ const_arg_iterator arg_end() const {
+ CheckLazyArguments();
+ return ArgumentList.end();
+ }
+
+ size_t arg_size() const;
+ bool arg_empty() const;
+
+ /// viewCFG - This function is meant for use from the debugger. You can just
+ /// say 'call F->viewCFG()' and a ghostview window should pop up from the
+ /// program, displaying the CFG of the current function with the code for each
+ /// basic block inside. This depends on there being a 'dot' and 'gv' program
+ /// in your path.
+ ///
+ void viewCFG() const;
+
+ /// viewCFGOnly - This function is meant for use from the debugger. It works
+ /// just like viewCFG, but it does not include the contents of basic blocks
+ /// into the nodes, just the label. If you are only interested in the CFG
+ /// this can make the graph smaller.
+ ///
+ void viewCFGOnly() const;
+
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const Function *) { return true; }
static inline bool classof(const Value *V) {
- return V->getValueType() == Value::FunctionVal;
+ return V->getValueID() == Value::FunctionVal;
}
- // dropAllReferences() - This function causes all the subinstructions to "let
- // go" of all references that they are maintaining. This allows one to
- // 'delete' a whole class at a time, even though there may be circular
- // references... first all references are dropped, and all use counts go to
- // zero. Then everything is delete'd for real. Note that no operations are
- // valid on an object that has "dropped all references", except operator
- // delete.
- //
+ /// dropAllReferences() - This method causes all the subinstructions to "let
+ /// go" of all references that they are maintaining. This allows one to
+ /// 'delete' a whole module at a time, even though there may be circular
+ /// references... first all references are dropped, and all use counts go to
+ /// zero. Then everything is deleted for real. Note that no operations are
+ /// valid on an object that has "dropped all references", except operator
+ /// delete.
+ ///
+ /// Since no other object in the module can have references into the body of a
+ /// function, dropping all references deletes the entire body of the function,
+ /// including any contained basic blocks.
+ ///
void dropAllReferences();
+
+ static unsigned getBasicBlockListOffset() {
+ Function *Obj = 0;
+ return unsigned(reinterpret_cast<uintptr_t>(&Obj->BasicBlocks));
+ }
+ static unsigned getArgumentListOffset() {
+ Function *Obj = 0;
+ return unsigned(reinterpret_cast<uintptr_t>(&Obj->ArgumentList));
+ }
};
+inline ValueSymbolTable *
+ilist_traits<BasicBlock>::getSymTab(Function *F) {
+ return F ? &F->getValueSymbolTable() : 0;
+}
+
+inline ValueSymbolTable *
+ilist_traits<Argument>::getSymTab(Function *F) {
+ return F ? &F->getValueSymbolTable() : 0;
+}
+
+inline int
+ilist_traits<BasicBlock>::getListOffset() {
+ return Function::getBasicBlockListOffset();
+}
+
+inline int
+ilist_traits<Argument>::getListOffset() {
+ return Function::getArgumentListOffset();
+}
+
+
+} // End llvm namespace
+
#endif
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