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//===-- llvm/Argument.h - Definition of the Argument class ------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares the Argument class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_ARGUMENT_H
#define LLVM_IR_ARGUMENT_H
#include "llvm/ADT/Twine.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Value.h"
#include <optional>
namespace llvm {
class ConstantRange;
/// This class represents an incoming formal argument to a Function. A formal
/// argument, since it is ``formal'', does not contain an actual value but
/// instead represents the type, argument number, and attributes of an argument
/// for a specific function. When used in the body of said function, the
/// argument of course represents the value of the actual argument that the
/// function was called with.
class Argument final : public Value {
Function *Parent;
unsigned ArgNo;
friend class Function;
void setParent(Function *parent);
public:
/// Argument constructor.
explicit Argument(Type *Ty, const Twine &Name = "", Function *F = nullptr,
unsigned ArgNo = 0);
inline const Function *getParent() const { return Parent; }
inline Function *getParent() { return Parent; }
/// Return the index of this formal argument in its containing function.
///
/// For example in "void foo(int a, float b)" a is 0 and b is 1.
unsigned getArgNo() const {
assert(Parent && "can't get number of unparented arg");
return ArgNo;
}
/// Return true if this argument has the nonnull attribute. Also returns true
/// if at least one byte is known to be dereferenceable and the pointer is in
/// addrspace(0).
/// If AllowUndefOrPoison is true, respect the semantics of nonnull attribute
/// and return true even if the argument can be undef or poison.
bool hasNonNullAttr(bool AllowUndefOrPoison = true) const;
/// If this argument has the dereferenceable attribute, return the number of
/// bytes known to be dereferenceable. Otherwise, zero is returned.
uint64_t getDereferenceableBytes() const;
/// If this argument has the dereferenceable_or_null attribute, return the
/// number of bytes known to be dereferenceable. Otherwise, zero is returned.
uint64_t getDereferenceableOrNullBytes() const;
/// If this argument has nofpclass attribute, return the mask representing
/// disallowed floating-point values. Otherwise, fcNone is returned.
FPClassTest getNoFPClass() const;
/// If this argument has a range attribute, return the value range of the
/// argument. Otherwise, std::nullopt is returned.
std::optional<ConstantRange> getRange() const;
/// Return true if this argument has the byval attribute.
bool hasByValAttr() const;
/// Return true if this argument has the byref attribute.
bool hasByRefAttr() const;
/// Return true if this argument has the swiftself attribute.
bool hasSwiftSelfAttr() const;
/// Return true if this argument has the swifterror attribute.
bool hasSwiftErrorAttr() const;
/// Return true if this argument has the byval, inalloca, or preallocated
/// attribute. These attributes represent arguments being passed by value,
/// with an associated copy between the caller and callee
bool hasPassPointeeByValueCopyAttr() const;
/// If this argument satisfies has hasPassPointeeByValueAttr, return the
/// in-memory ABI size copied to the stack for the call. Otherwise, return 0.
uint64_t getPassPointeeByValueCopySize(const DataLayout &DL) const;
/// Return true if this argument has the byval, sret, inalloca, preallocated,
/// or byref attribute. These attributes represent arguments being passed by
/// value (which may or may not involve a stack copy)
bool hasPointeeInMemoryValueAttr() const;
/// If hasPointeeInMemoryValueAttr returns true, the in-memory ABI type is
/// returned. Otherwise, nullptr.
Type *getPointeeInMemoryValueType() const;
/// If this is a byval or inalloca argument, return its alignment.
/// FIXME: Remove this function once transition to Align is over.
/// Use getParamAlign() instead.
LLVM_DEPRECATED("Use getParamAlign() instead", "getParamAlign")
uint64_t getParamAlignment() const;
/// If this is a byval or inalloca argument, return its alignment.
MaybeAlign getParamAlign() const;
MaybeAlign getParamStackAlign() const;
/// If this is a byval argument, return its type.
Type *getParamByValType() const;
/// If this is an sret argument, return its type.
Type *getParamStructRetType() const;
/// If this is a byref argument, return its type.
Type *getParamByRefType() const;
/// If this is an inalloca argument, return its type.
Type *getParamInAllocaType() const;
/// Return true if this argument has the nest attribute.
bool hasNestAttr() const;
/// Return true if this argument has the noalias attribute.
bool hasNoAliasAttr() const;
/// Return true if this argument has the nocapture attribute.
bool hasNoCaptureAttr() const;
/// Return true if this argument has the nofree attribute.
bool hasNoFreeAttr() const;
/// Return true if this argument has the sret attribute.
bool hasStructRetAttr() const;
/// Return true if this argument has the inreg attribute.
bool hasInRegAttr() const;
/// Return true if this argument has the returned attribute.
bool hasReturnedAttr() const;
/// Return true if this argument has the readonly or readnone attribute.
bool onlyReadsMemory() const;
/// Return true if this argument has the inalloca attribute.
bool hasInAllocaAttr() const;
/// Return true if this argument has the preallocated attribute.
bool hasPreallocatedAttr() const;
/// Return true if this argument has the zext attribute.
bool hasZExtAttr() const;
/// Return true if this argument has the sext attribute.
bool hasSExtAttr() const;
/// Add attributes to an argument.
void addAttrs(AttrBuilder &B);
void addAttr(Attribute::AttrKind Kind);
void addAttr(Attribute Attr);
/// Remove attributes from an argument.
void removeAttr(Attribute::AttrKind Kind);
void removeAttrs(const AttributeMask &AM);
/// Check if an argument has a given attribute.
bool hasAttribute(Attribute::AttrKind Kind) const;
Attribute getAttribute(Attribute::AttrKind Kind) const;
/// Method for support type inquiry through isa, cast, and dyn_cast.
static bool classof(const Value *V) {
return V->getValueID() == ArgumentVal;
}
};
} // End llvm namespace
#endif
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