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6690dbffe0
This change adds new attribute called "argmemonly". Function marked with this attribute can only access memory through it's argument pointers. This attribute directly corresponds to the "OnlyAccessesArgumentPointees" ModRef behaviour in alias analysis. Differential Revision: http://reviews.llvm.org/D10398 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241979 91177308-0d34-0410-b5e6-96231b3b80d8
583 lines
24 KiB
C++
583 lines
24 KiB
C++
//===-- llvm/Attributes.h - Container for Attributes ------------*- 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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/// \file
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/// \brief This file contains the simple types necessary to represent the
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/// attributes associated with functions and their calls.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_ATTRIBUTES_H
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#define LLVM_IR_ATTRIBUTES_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/PointerLikeTypeTraits.h"
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#include <bitset>
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#include <cassert>
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#include <map>
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#include <string>
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namespace llvm {
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class AttrBuilder;
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class AttributeImpl;
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class AttributeSetImpl;
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class AttributeSetNode;
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class Constant;
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template<typename T> struct DenseMapInfo;
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class LLVMContext;
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class Type;
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief Functions, function parameters, and return types can have attributes
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/// to indicate how they should be treated by optimizations and code
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/// generation. This class represents one of those attributes. It's light-weight
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/// and should be passed around by-value.
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class Attribute {
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public:
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/// This enumeration lists the attributes that can be associated with
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/// parameters, function results, or the function itself.
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///
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/// Note: The `uwtable' attribute is about the ABI or the user mandating an
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/// entry in the unwind table. The `nounwind' attribute is about an exception
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/// passing by the function.
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///
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/// In a theoretical system that uses tables for profiling and SjLj for
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/// exceptions, they would be fully independent. In a normal system that uses
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/// tables for both, the semantics are:
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///
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/// nil = Needs an entry because an exception might pass by.
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/// nounwind = No need for an entry
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/// uwtable = Needs an entry because the ABI says so and because
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/// an exception might pass by.
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/// uwtable + nounwind = Needs an entry because the ABI says so.
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enum AttrKind {
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// IR-Level Attributes
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None, ///< No attributes have been set
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Alignment, ///< Alignment of parameter (5 bits)
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///< stored as log2 of alignment with +1 bias
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///< 0 means unaligned (different from align(1))
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AlwaysInline, ///< inline=always
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Builtin, ///< Callee is recognized as a builtin, despite
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///< nobuiltin attribute on its declaration.
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ByVal, ///< Pass structure by value
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InAlloca, ///< Pass structure in an alloca
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Cold, ///< Marks function as being in a cold path.
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Convergent, ///< Can only be moved to control-equivalent blocks
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InlineHint, ///< Source said inlining was desirable
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InReg, ///< Force argument to be passed in register
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JumpTable, ///< Build jump-instruction tables and replace refs.
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MinSize, ///< Function must be optimized for size first
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Naked, ///< Naked function
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Nest, ///< Nested function static chain
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NoAlias, ///< Considered to not alias after call
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NoBuiltin, ///< Callee isn't recognized as a builtin
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NoCapture, ///< Function creates no aliases of pointer
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NoDuplicate, ///< Call cannot be duplicated
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NoImplicitFloat, ///< Disable implicit floating point insts
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NoInline, ///< inline=never
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NonLazyBind, ///< Function is called early and/or
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///< often, so lazy binding isn't worthwhile
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NonNull, ///< Pointer is known to be not null
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Dereferenceable, ///< Pointer is known to be dereferenceable
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DereferenceableOrNull, ///< Pointer is either null or dereferenceable
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NoRedZone, ///< Disable redzone
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NoReturn, ///< Mark the function as not returning
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NoUnwind, ///< Function doesn't unwind stack
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OptimizeForSize, ///< opt_size
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OptimizeNone, ///< Function must not be optimized.
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ReadNone, ///< Function does not access memory
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ReadOnly, ///< Function only reads from memory
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ArgMemOnly, ///< Funciton can access memory only using pointers
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///< based on its arguments.
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Returned, ///< Return value is always equal to this argument
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ReturnsTwice, ///< Function can return twice
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SExt, ///< Sign extended before/after call
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StackAlignment, ///< Alignment of stack for function (3 bits)
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///< stored as log2 of alignment with +1 bias 0
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///< means unaligned (different from
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///< alignstack=(1))
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StackProtect, ///< Stack protection.
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StackProtectReq, ///< Stack protection required.
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StackProtectStrong, ///< Strong Stack protection.
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SafeStack, ///< Safe Stack protection.
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StructRet, ///< Hidden pointer to structure to return
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SanitizeAddress, ///< AddressSanitizer is on.
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SanitizeThread, ///< ThreadSanitizer is on.
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SanitizeMemory, ///< MemorySanitizer is on.
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UWTable, ///< Function must be in a unwind table
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ZExt, ///< Zero extended before/after call
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EndAttrKinds ///< Sentinal value useful for loops
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};
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private:
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AttributeImpl *pImpl;
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Attribute(AttributeImpl *A) : pImpl(A) {}
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public:
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Attribute() : pImpl(nullptr) {}
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//===--------------------------------------------------------------------===//
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// Attribute Construction
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//===--------------------------------------------------------------------===//
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/// \brief Return a uniquified Attribute object.
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static Attribute get(LLVMContext &Context, AttrKind Kind, uint64_t Val = 0);
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static Attribute get(LLVMContext &Context, StringRef Kind,
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StringRef Val = StringRef());
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/// \brief Return a uniquified Attribute object that has the specific
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/// alignment set.
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static Attribute getWithAlignment(LLVMContext &Context, uint64_t Align);
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static Attribute getWithStackAlignment(LLVMContext &Context, uint64_t Align);
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static Attribute getWithDereferenceableBytes(LLVMContext &Context,
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uint64_t Bytes);
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static Attribute getWithDereferenceableOrNullBytes(LLVMContext &Context,
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uint64_t Bytes);
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//===--------------------------------------------------------------------===//
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// Attribute Accessors
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//===--------------------------------------------------------------------===//
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/// \brief Return true if the attribute is an Attribute::AttrKind type.
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bool isEnumAttribute() const;
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/// \brief Return true if the attribute is an integer attribute.
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bool isIntAttribute() const;
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/// \brief Return true if the attribute is a string (target-dependent)
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/// attribute.
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bool isStringAttribute() const;
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/// \brief Return true if the attribute is present.
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bool hasAttribute(AttrKind Val) const;
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/// \brief Return true if the target-dependent attribute is present.
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bool hasAttribute(StringRef Val) const;
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/// \brief Return the attribute's kind as an enum (Attribute::AttrKind). This
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/// requires the attribute to be an enum or alignment attribute.
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Attribute::AttrKind getKindAsEnum() const;
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/// \brief Return the attribute's value as an integer. This requires that the
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/// attribute be an alignment attribute.
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uint64_t getValueAsInt() const;
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/// \brief Return the attribute's kind as a string. This requires the
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/// attribute to be a string attribute.
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StringRef getKindAsString() const;
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/// \brief Return the attribute's value as a string. This requires the
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/// attribute to be a string attribute.
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StringRef getValueAsString() const;
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/// \brief Returns the alignment field of an attribute as a byte alignment
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/// value.
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unsigned getAlignment() const;
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/// \brief Returns the stack alignment field of an attribute as a byte
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/// alignment value.
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unsigned getStackAlignment() const;
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/// \brief Returns the number of dereferenceable bytes from the
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/// dereferenceable attribute (or zero if unknown).
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uint64_t getDereferenceableBytes() const;
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/// \brief Returns the number of dereferenceable_or_null bytes from the
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/// dereferenceable_or_null attribute (or zero if unknown).
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uint64_t getDereferenceableOrNullBytes() const;
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/// \brief The Attribute is converted to a string of equivalent mnemonic. This
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/// is, presumably, for writing out the mnemonics for the assembly writer.
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std::string getAsString(bool InAttrGrp = false) const;
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/// \brief Equality and non-equality operators.
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bool operator==(Attribute A) const { return pImpl == A.pImpl; }
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bool operator!=(Attribute A) const { return pImpl != A.pImpl; }
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/// \brief Less-than operator. Useful for sorting the attributes list.
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bool operator<(Attribute A) const;
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void Profile(FoldingSetNodeID &ID) const {
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ID.AddPointer(pImpl);
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}
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class holds the attributes for a function, its return value, and
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/// its parameters. You access the attributes for each of them via an index into
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/// the AttributeSet object. The function attributes are at index
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/// `AttributeSet::FunctionIndex', the return value is at index
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/// `AttributeSet::ReturnIndex', and the attributes for the parameters start at
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/// index `1'.
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class AttributeSet {
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public:
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enum AttrIndex : unsigned {
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ReturnIndex = 0U,
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FunctionIndex = ~0U
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};
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private:
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friend class AttrBuilder;
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friend class AttributeSetImpl;
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template <typename Ty> friend struct DenseMapInfo;
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/// \brief The attributes that we are managing. This can be null to represent
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/// the empty attributes list.
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AttributeSetImpl *pImpl;
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/// \brief The attributes for the specified index are returned.
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AttributeSetNode *getAttributes(unsigned Index) const;
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/// \brief Create an AttributeSet with the specified parameters in it.
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static AttributeSet get(LLVMContext &C,
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ArrayRef<std::pair<unsigned, Attribute> > Attrs);
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static AttributeSet get(LLVMContext &C,
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ArrayRef<std::pair<unsigned,
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AttributeSetNode*> > Attrs);
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static AttributeSet getImpl(LLVMContext &C,
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ArrayRef<std::pair<unsigned,
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AttributeSetNode*> > Attrs);
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explicit AttributeSet(AttributeSetImpl *LI) : pImpl(LI) {}
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public:
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AttributeSet() : pImpl(nullptr) {}
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//===--------------------------------------------------------------------===//
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// AttributeSet Construction and Mutation
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//===--------------------------------------------------------------------===//
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/// \brief Return an AttributeSet with the specified parameters in it.
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static AttributeSet get(LLVMContext &C, ArrayRef<AttributeSet> Attrs);
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static AttributeSet get(LLVMContext &C, unsigned Index,
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ArrayRef<Attribute::AttrKind> Kind);
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static AttributeSet get(LLVMContext &C, unsigned Index, const AttrBuilder &B);
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/// \brief Add an attribute to the attribute set at the given index. Because
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/// attribute sets are immutable, this returns a new set.
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AttributeSet addAttribute(LLVMContext &C, unsigned Index,
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Attribute::AttrKind Attr) const;
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/// \brief Add an attribute to the attribute set at the given index. Because
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/// attribute sets are immutable, this returns a new set.
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AttributeSet addAttribute(LLVMContext &C, unsigned Index,
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StringRef Kind) const;
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AttributeSet addAttribute(LLVMContext &C, unsigned Index,
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StringRef Kind, StringRef Value) const;
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/// \brief Add attributes to the attribute set at the given index. Because
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/// attribute sets are immutable, this returns a new set.
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AttributeSet addAttributes(LLVMContext &C, unsigned Index,
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AttributeSet Attrs) const;
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/// \brief Remove the specified attribute at the specified index from this
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/// attribute list. Because attribute lists are immutable, this returns the
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/// new list.
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AttributeSet removeAttribute(LLVMContext &C, unsigned Index,
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Attribute::AttrKind Attr) const;
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/// \brief Remove the specified attributes at the specified index from this
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/// attribute list. Because attribute lists are immutable, this returns the
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/// new list.
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AttributeSet removeAttributes(LLVMContext &C, unsigned Index,
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AttributeSet Attrs) const;
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/// \brief Remove the specified attributes at the specified index from this
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/// attribute list. Because attribute lists are immutable, this returns the
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/// new list.
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AttributeSet removeAttributes(LLVMContext &C, unsigned Index,
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const AttrBuilder &Attrs) const;
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/// \brief Add the dereferenceable attribute to the attribute set at the given
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/// index. Because attribute sets are immutable, this returns a new set.
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AttributeSet addDereferenceableAttr(LLVMContext &C, unsigned Index,
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uint64_t Bytes) const;
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/// \brief Add the dereferenceable_or_null attribute to the attribute set at
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/// the given index. Because attribute sets are immutable, this returns a new
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/// set.
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AttributeSet addDereferenceableOrNullAttr(LLVMContext &C, unsigned Index,
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uint64_t Bytes) const;
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//===--------------------------------------------------------------------===//
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// AttributeSet Accessors
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//===--------------------------------------------------------------------===//
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/// \brief Retrieve the LLVM context.
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LLVMContext &getContext() const;
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/// \brief The attributes for the specified index are returned.
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AttributeSet getParamAttributes(unsigned Index) const;
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/// \brief The attributes for the ret value are returned.
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AttributeSet getRetAttributes() const;
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/// \brief The function attributes are returned.
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AttributeSet getFnAttributes() const;
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/// \brief Return true if the attribute exists at the given index.
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bool hasAttribute(unsigned Index, Attribute::AttrKind Kind) const;
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/// \brief Return true if the attribute exists at the given index.
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bool hasAttribute(unsigned Index, StringRef Kind) const;
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/// \brief Return true if attribute exists at the given index.
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bool hasAttributes(unsigned Index) const;
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/// \brief Return true if the specified attribute is set for at least one
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/// parameter or for the return value.
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bool hasAttrSomewhere(Attribute::AttrKind Attr) const;
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/// \brief Return the attribute object that exists at the given index.
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Attribute getAttribute(unsigned Index, Attribute::AttrKind Kind) const;
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/// \brief Return the attribute object that exists at the given index.
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Attribute getAttribute(unsigned Index, StringRef Kind) const;
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/// \brief Return the alignment for the specified function parameter.
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unsigned getParamAlignment(unsigned Index) const;
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/// \brief Get the stack alignment.
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unsigned getStackAlignment(unsigned Index) const;
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/// \brief Get the number of dereferenceable bytes (or zero if unknown).
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uint64_t getDereferenceableBytes(unsigned Index) const;
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/// \brief Get the number of dereferenceable_or_null bytes (or zero if
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/// unknown).
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uint64_t getDereferenceableOrNullBytes(unsigned Index) const;
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/// \brief Return the attributes at the index as a string.
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std::string getAsString(unsigned Index, bool InAttrGrp = false) const;
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typedef ArrayRef<Attribute>::iterator iterator;
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iterator begin(unsigned Slot) const;
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iterator end(unsigned Slot) const;
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/// operator==/!= - Provide equality predicates.
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bool operator==(const AttributeSet &RHS) const {
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return pImpl == RHS.pImpl;
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}
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bool operator!=(const AttributeSet &RHS) const {
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return pImpl != RHS.pImpl;
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}
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//===--------------------------------------------------------------------===//
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// AttributeSet Introspection
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//===--------------------------------------------------------------------===//
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// FIXME: Remove this.
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uint64_t Raw(unsigned Index) const;
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/// \brief Return a raw pointer that uniquely identifies this attribute list.
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void *getRawPointer() const {
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return pImpl;
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}
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/// \brief Return true if there are no attributes.
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bool isEmpty() const {
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return getNumSlots() == 0;
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}
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/// \brief Return the number of slots used in this attribute list. This is
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/// the number of arguments that have an attribute set on them (including the
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/// function itself).
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unsigned getNumSlots() const;
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/// \brief Return the index for the given slot.
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unsigned getSlotIndex(unsigned Slot) const;
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/// \brief Return the attributes at the given slot.
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AttributeSet getSlotAttributes(unsigned Slot) const;
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void dump() const;
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief Provide DenseMapInfo for AttributeSet.
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template<> struct DenseMapInfo<AttributeSet> {
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static inline AttributeSet getEmptyKey() {
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uintptr_t Val = static_cast<uintptr_t>(-1);
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Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
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return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
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}
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static inline AttributeSet getTombstoneKey() {
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uintptr_t Val = static_cast<uintptr_t>(-2);
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Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
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return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
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}
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static unsigned getHashValue(AttributeSet AS) {
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return (unsigned((uintptr_t)AS.pImpl) >> 4) ^
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(unsigned((uintptr_t)AS.pImpl) >> 9);
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}
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static bool isEqual(AttributeSet LHS, AttributeSet RHS) { return LHS == RHS; }
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};
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//===----------------------------------------------------------------------===//
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/// \class
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/// \brief This class is used in conjunction with the Attribute::get method to
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/// create an Attribute object. The object itself is uniquified. The Builder's
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/// value, however, is not. So this can be used as a quick way to test for
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/// equality, presence of attributes, etc.
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class AttrBuilder {
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std::bitset<Attribute::EndAttrKinds> Attrs;
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std::map<std::string, std::string> TargetDepAttrs;
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uint64_t Alignment;
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uint64_t StackAlignment;
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uint64_t DerefBytes;
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uint64_t DerefOrNullBytes;
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public:
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AttrBuilder()
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: Attrs(0), Alignment(0), StackAlignment(0), DerefBytes(0),
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DerefOrNullBytes(0) {}
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explicit AttrBuilder(uint64_t Val)
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: Attrs(0), Alignment(0), StackAlignment(0), DerefBytes(0),
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DerefOrNullBytes(0) {
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addRawValue(Val);
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}
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AttrBuilder(const Attribute &A)
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: Attrs(0), Alignment(0), StackAlignment(0), DerefBytes(0),
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DerefOrNullBytes(0) {
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addAttribute(A);
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}
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AttrBuilder(AttributeSet AS, unsigned Idx);
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void clear();
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/// \brief Add an attribute to the builder.
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AttrBuilder &addAttribute(Attribute::AttrKind Val);
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/// \brief Add the Attribute object to the builder.
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AttrBuilder &addAttribute(Attribute A);
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/// \brief Add the target-dependent attribute to the builder.
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AttrBuilder &addAttribute(StringRef A, StringRef V = StringRef());
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/// \brief Remove an attribute from the builder.
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AttrBuilder &removeAttribute(Attribute::AttrKind Val);
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/// \brief Remove the attributes from the builder.
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AttrBuilder &removeAttributes(AttributeSet A, uint64_t Index);
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/// \brief Remove the target-dependent attribute to the builder.
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AttrBuilder &removeAttribute(StringRef A);
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/// \brief Add the attributes from the builder.
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AttrBuilder &merge(const AttrBuilder &B);
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/// \brief Remove the attributes from the builder.
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AttrBuilder &remove(const AttrBuilder &B);
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/// \brief Return true if the builder has any attribute that's in the
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/// specified builder.
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bool overlaps(const AttrBuilder &B) const;
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/// \brief Return true if the builder has the specified attribute.
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bool contains(Attribute::AttrKind A) const {
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assert((unsigned)A < Attribute::EndAttrKinds && "Attribute out of range!");
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return Attrs[A];
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}
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/// \brief Return true if the builder has the specified target-dependent
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/// attribute.
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bool contains(StringRef A) const;
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/// \brief Return true if the builder has IR-level attributes.
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bool hasAttributes() const;
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/// \brief Return true if the builder has any attribute that's in the
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/// specified attribute.
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bool hasAttributes(AttributeSet A, uint64_t Index) const;
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/// \brief Return true if the builder has an alignment attribute.
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bool hasAlignmentAttr() const;
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/// \brief Retrieve the alignment attribute, if it exists.
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uint64_t getAlignment() const { return Alignment; }
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/// \brief Retrieve the stack alignment attribute, if it exists.
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uint64_t getStackAlignment() const { return StackAlignment; }
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/// \brief Retrieve the number of dereferenceable bytes, if the dereferenceable
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/// attribute exists (zero is returned otherwise).
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uint64_t getDereferenceableBytes() const { return DerefBytes; }
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/// \brief Retrieve the number of dereferenceable_or_null bytes, if the
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/// dereferenceable_or_null attribute exists (zero is returned otherwise).
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|
uint64_t getDereferenceableOrNullBytes() const { return DerefOrNullBytes; }
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/// \brief This turns an int alignment (which must be a power of 2) into the
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/// form used internally in Attribute.
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AttrBuilder &addAlignmentAttr(unsigned Align);
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/// \brief This turns an int stack alignment (which must be a power of 2) into
|
|
/// the form used internally in Attribute.
|
|
AttrBuilder &addStackAlignmentAttr(unsigned Align);
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/// \brief This turns the number of dereferenceable bytes into the form used
|
|
/// internally in Attribute.
|
|
AttrBuilder &addDereferenceableAttr(uint64_t Bytes);
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|
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/// \brief This turns the number of dereferenceable_or_null bytes into the
|
|
/// form used internally in Attribute.
|
|
AttrBuilder &addDereferenceableOrNullAttr(uint64_t Bytes);
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/// \brief Return true if the builder contains no target-independent
|
|
/// attributes.
|
|
bool empty() const { return Attrs.none(); }
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|
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// Iterators for target-dependent attributes.
|
|
typedef std::pair<std::string, std::string> td_type;
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typedef std::map<std::string, std::string>::iterator td_iterator;
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|
typedef std::map<std::string, std::string>::const_iterator td_const_iterator;
|
|
typedef llvm::iterator_range<td_iterator> td_range;
|
|
typedef llvm::iterator_range<td_const_iterator> td_const_range;
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|
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td_iterator td_begin() { return TargetDepAttrs.begin(); }
|
|
td_iterator td_end() { return TargetDepAttrs.end(); }
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|
|
td_const_iterator td_begin() const { return TargetDepAttrs.begin(); }
|
|
td_const_iterator td_end() const { return TargetDepAttrs.end(); }
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|
|
|
td_range td_attrs() { return td_range(td_begin(), td_end()); }
|
|
td_const_range td_attrs() const {
|
|
return td_const_range(td_begin(), td_end());
|
|
}
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|
|
|
bool td_empty() const { return TargetDepAttrs.empty(); }
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|
|
|
bool operator==(const AttrBuilder &B);
|
|
bool operator!=(const AttrBuilder &B) {
|
|
return !(*this == B);
|
|
}
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|
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// FIXME: Remove this in 4.0.
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|
|
|
/// \brief Add the raw value to the internal representation.
|
|
AttrBuilder &addRawValue(uint64_t Val);
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|
};
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|
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namespace AttributeFuncs {
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/// \brief Which attributes cannot be applied to a type.
|
|
AttrBuilder typeIncompatible(const Type *Ty);
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|
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} // end AttributeFuncs namespace
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} // end llvm namespace
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#endif
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