blob: 58184de3b18993c9746d75fe492a15c2c47c0603 [file] [log] [blame]
//===-- llvm/Function.h - Class to represent a single function --*- 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 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.
#include "llvm/GlobalValue.h"
#include "llvm/BasicBlock.h"
#include "llvm/Argument.h"
#include "llvm/Support/Annotation.h"
namespace llvm {
class FunctionType;
// Traits for intrusive list of instructions...
template<> struct ilist_traits<BasicBlock>
: public SymbolTableListTraits<BasicBlock, Function, 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);
template<> struct ilist_traits<Argument>
: public SymbolTableListTraits<Argument, Function, 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);
class Function : public GlobalValue, public Annotable {
typedef iplist<Argument> ArgumentListType;
typedef iplist<BasicBlock> BasicBlockListType;
// BasicBlock iterators...
typedef BasicBlockListType::iterator iterator;
typedef BasicBlockListType::const_iterator const_iterator;
typedef ArgumentListType::iterator arg_iterator;
typedef ArgumentListType::const_iterator const_arg_iterator;
// Important things that make up a function!
BasicBlockListType BasicBlocks; // The basic blocks
ArgumentListType ArgumentList; // The formal arguments
SymbolTable *SymTab;
unsigned CallingConvention;
friend class SymbolTableListTraits<Function, Module, Module>;
void setParent(Module *parent);
Function *Prev, *Next;
void setNext(Function *N) { Next = N; }
void setPrev(Function *N) { Prev = N; }
/// 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);
const Type *getReturnType() const; // Return the type of the ret val
const FunctionType *getFunctionType() const; // Return the FunctionType for me
/// isVarArg - Return true if this function takes a variable number of
/// arguments.
bool isVarArg() const;
/// isExternal - 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
virtual bool isExternal() 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() 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 CallingConvention; }
void setCallingConv(unsigned CC) { CallingConvention = CC; }
/// renameLocalSymbols - This method goes through the Function's symbol table
/// and renames any symbols that conflict with symbols at global scope. This
/// is required before printing out to a textual form, to ensure that there is
/// no ambiguity when parsing.
void renameLocalSymbols();
/// deleteBody - This method deletes the body of the function, and converts
/// the linkage to external.
void deleteBody() {
/// removeFromParent - This method unlinks 'this' from the containing module,
/// but does not delete it.
void removeFromParent();
/// eraseFromParent - This method unlinks 'this' from the containing module
/// and deletes it.
void eraseFromParent();
// getNext/Prev - Return the next or previous function in the list. These
// methods should never be used directly, and are only used to implement the
// function list as part of the module.
Function *getNext() { return Next; }
const Function *getNext() const { return Next; }
Function *getPrev() { return Prev; }
const Function *getPrev() const { return Prev; }
/// Get the underlying elements of the Function... the basic block list is
/// empty for external functions.
const ArgumentListType &getArgumentList() const { return ArgumentList; }
ArgumentListType &getArgumentList() { 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...
/// getSymbolTable() - Return the symbol table...
inline SymbolTable &getSymbolTable() { return *SymTab; }
inline const SymbolTable &getSymbolTable() const { return *SymTab; }
// BasicBlock iterator forwarding functions
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(); }
// Argument iterator forwarding functions
arg_iterator arg_begin() { return ArgumentList.begin(); }
const_arg_iterator arg_begin() const { return ArgumentList.begin(); }
arg_iterator arg_end () { return ArgumentList.end(); }
const_arg_iterator arg_end () const { return ArgumentList.end(); }
size_t arg_size () const { return ArgumentList.size(); }
bool arg_empty() const { return ArgumentList.empty(); }
virtual void print(std::ostream &OS) const { print(OS, 0); }
void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) 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;
/// 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();
} // End llvm namespace