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