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4b70bfc905
The inalloca attribute is designed to support passing C++ objects by value in the Microsoft C++ ABI. It behaves the same as byval, except that it always implies that the argument is in memory and that the bytes are never copied. This attribute allows the caller to take the address of an outgoing argument's memory and execute arbitrary code to store into it. This patch adds basic IR support, docs, and verification. It does not attempt to implement any lowering or fix any possibly broken transforms. When this patch lands, a complete description of this feature should appear at http://llvm.org/docs/InAlloca.html . Differential Revision: http://llvm-reviews.chandlerc.com/D2173 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197645 91177308-0d34-0410-b5e6-96231b3b80d8
109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
//===-- llvm/Argument.h - Definition of the Argument class ------*- 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 declares the Argument class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_ARGUMENT_H
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#define LLVM_IR_ARGUMENT_H
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#include "llvm/ADT/Twine.h"
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#include "llvm/ADT/ilist_node.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/IR/Value.h"
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namespace llvm {
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template<typename ValueSubClass, typename ItemParentClass>
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class SymbolTableListTraits;
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/// \brief LLVM Argument representation
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///
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/// This class represents an incoming formal argument to a Function. A formal
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/// argument, since it is ``formal'', does not contain an actual value but
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/// instead represents the type, argument number, and attributes of an argument
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/// for a specific function. When used in the body of said function, the
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/// argument of course represents the value of the actual argument that the
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/// function was called with.
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class Argument : public Value, public ilist_node<Argument> {
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virtual void anchor();
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Function *Parent;
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friend class SymbolTableListTraits<Argument, Function>;
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void setParent(Function *parent);
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public:
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/// \brief Constructor.
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///
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/// If \p F is specified, the argument is inserted at the end of the argument
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/// list for \p F.
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explicit Argument(Type *Ty, const Twine &Name = "", Function *F = 0);
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inline const Function *getParent() const { return Parent; }
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inline Function *getParent() { return Parent; }
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/// \brief Return the index of this formal argument in its containing
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/// function.
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///
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/// For example in "void foo(int a, float b)" a is 0 and b is 1.
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unsigned getArgNo() const;
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/// \brief Return true if this argument has the byval attribute on it in its
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/// containing function.
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bool hasByValAttr() const;
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/// \brief If this is a byval or inalloca argument, return its alignment.
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unsigned getParamAlignment() const;
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/// \brief Return true if this argument has the nest attribute on it in its
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/// containing function.
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bool hasNestAttr() const;
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/// \brief Return true if this argument has the noalias attribute on it in its
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/// containing function.
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bool hasNoAliasAttr() const;
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/// \brief Return true if this argument has the nocapture attribute on it in
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/// its containing function.
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bool hasNoCaptureAttr() const;
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/// \brief Return true if this argument has the sret attribute on it in its
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/// containing function.
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bool hasStructRetAttr() const;
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/// \brief Return true if this argument has the returned attribute on it in
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/// its containing function.
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bool hasReturnedAttr() const;
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/// \brief Return true if this argument has the readonly or readnone attribute
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/// on it in its containing function.
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bool onlyReadsMemory() const;
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/// \brief Return true if this argument has the inalloca attribute on it in
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/// its containing function.
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bool hasInAllocaAttr() const;
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/// \brief Add a Attribute to an argument.
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void addAttr(AttributeSet AS);
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/// \brief Remove a Attribute from an argument.
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void removeAttr(AttributeSet AS);
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/// \brief Method for support type inquiry through isa, cast, and
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/// dyn_cast.
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static inline bool classof(const Value *V) {
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return V->getValueID() == ArgumentVal;
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}
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};
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} // End llvm namespace
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#endif
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