llvm-6502/include/llvm/Function.h
Chris Lattner 49269d9e7e Disallow copying explicitly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45518 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-03 00:09:47 +00:00

340 lines
12 KiB
C++

//===-- llvm/Function.h - Class to represent a single function --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// 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.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_FUNCTION_H
#define LLVM_FUNCTION_H
#include "llvm/GlobalValue.h"
#include "llvm/BasicBlock.h"
#include "llvm/Argument.h"
#include "llvm/Support/Annotation.h"
namespace llvm {
class FunctionType;
class ParamAttrsList;
// 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:
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;
private:
// Important things that make up a function!
BasicBlockListType BasicBlocks; ///< The basic blocks
mutable ArgumentListType ArgumentList; ///< The formal arguments
ValueSymbolTable *SymTab; ///< Symbol table of args/instructions
const ParamAttrsList *ParamAttrs; ///< Parameter attributes
// The Calling Convention is stored in Value::SubclassData.
/*unsigned CallingConvention;*/
friend class SymbolTableListTraits<Function, Module>;
void setParent(Module *parent);
Function *Prev, *Next;
void setNext(Function *N) { Next = N; }
void setPrev(Function *N) { Prev = N; }
// 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; }
/// 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
public:
/// 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);
~Function();
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;
/// 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);
}
/// Obtains a constant pointer to the ParamAttrsList object which holds the
/// parameter attributes information, if any.
/// @returns 0 if no parameter attributes have been set.
/// @brief Get the parameter attributes.
const ParamAttrsList *getParamAttrs() const { return ParamAttrs; }
/// Sets the parameter attributes for this Function. To construct a
/// ParamAttrsList, see ParameterAttributes.h
/// @brief Set the parameter attributes.
void setParamAttrs(const ParamAttrsList *attrs);
/// hasCollector/getCollector/setCollector/clearCollector - The name of the
/// garbage collection algorithm to use during code generation.
bool hasCollector() const;
const char *getCollector() const;
void setCollector(const char *Str);
void clearCollector();
/// @brief Determine whether the function has the given attribute.
bool paramHasAttr(uint16_t i, unsigned attr) const;
/// @brief Determine if the function cannot return.
bool doesNotReturn() const;
/// @brief Determine if the function cannot unwind.
bool doesNotThrow() const;
/// @brief Determine if the function does not access memory.
bool doesNotAccessMemory() const;
/// @brief Determine if the function does not access or only reads memory.
bool onlyReadsMemory() const;
/// @brief Determine if the function returns a structure.
bool isStructReturn() const;
/// 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.
///
void removeFromParent();
/// eraseFromParent - This method unlinks 'this' from the containing module
/// and deletes it.
///
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...
/// getSymbolTable() - Return the symbol table...
///
inline ValueSymbolTable &getValueSymbolTable() { return *SymTab; }
inline const ValueSymbolTable &getValueSymbolTable() 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() {
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;
virtual void print(std::ostream &OS) const { print(OS, 0); }
void print(std::ostream *OS) const { if (OS) print(*OS); }
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->getValueID() == 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();
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