mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-26 21:32:10 +00:00
77226a03dc
Other than recognizing the attribute, the patch does little else. It changes the branch probability analyzer so that edges into blocks postdominated by a cold function are given low weight. Added analysis and code generation tests. Added documentation for the new attribute. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182638 91177308-0d34-0410-b5e6-96231b3b80d8
499 lines
20 KiB
C++
499 lines
20 KiB
C++
//===-- llvm/Attributes.h - Container for Attributes ------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// \brief This file contains the simple types necessary to represent the
|
|
/// attributes associated with functions and their calls.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_IR_ATTRIBUTES_H
|
|
#define LLVM_IR_ATTRIBUTES_H
|
|
|
|
#include "llvm/ADT/ArrayRef.h"
|
|
#include "llvm/ADT/FoldingSet.h"
|
|
#include "llvm/Support/PointerLikeTypeTraits.h"
|
|
#include <bitset>
|
|
#include <cassert>
|
|
#include <map>
|
|
#include <string>
|
|
|
|
namespace llvm {
|
|
|
|
class AttrBuilder;
|
|
class AttributeImpl;
|
|
class AttributeSetImpl;
|
|
class AttributeSetNode;
|
|
class Constant;
|
|
template<typename T> struct DenseMapInfo;
|
|
class LLVMContext;
|
|
class Type;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// \class
|
|
/// \brief Functions, function parameters, and return types can have attributes
|
|
/// to indicate how they should be treated by optimizations and code
|
|
/// generation. This class represents one of those attributes. It's light-weight
|
|
/// and should be passed around by-value.
|
|
class Attribute {
|
|
public:
|
|
/// This enumeration lists the attributes that can be associated with
|
|
/// parameters, function results, or the function itself.
|
|
///
|
|
/// Note: The `uwtable' attribute is about the ABI or the user mandating an
|
|
/// entry in the unwind table. The `nounwind' attribute is about an exception
|
|
/// passing by the function.
|
|
///
|
|
/// In a theoretical system that uses tables for profiling and SjLj for
|
|
/// exceptions, they would be fully independent. In a normal system that uses
|
|
/// tables for both, the semantics are:
|
|
///
|
|
/// nil = Needs an entry because an exception might pass by.
|
|
/// nounwind = No need for an entry
|
|
/// uwtable = Needs an entry because the ABI says so and because
|
|
/// an exception might pass by.
|
|
/// uwtable + nounwind = Needs an entry because the ABI says so.
|
|
|
|
enum AttrKind {
|
|
// IR-Level Attributes
|
|
None, ///< No attributes have been set
|
|
Alignment, ///< Alignment of parameter (5 bits)
|
|
///< stored as log2 of alignment with +1 bias
|
|
///< 0 means unaligned (different from align(1))
|
|
AlwaysInline, ///< inline=always
|
|
ByVal, ///< Pass structure by value
|
|
Cold, ///< Marks function as being in a cold path.
|
|
InlineHint, ///< Source said inlining was desirable
|
|
InReg, ///< Force argument to be passed in register
|
|
MinSize, ///< Function must be optimized for size first
|
|
Naked, ///< Naked function
|
|
Nest, ///< Nested function static chain
|
|
NoAlias, ///< Considered to not alias after call
|
|
NoBuiltin, ///< Callee isn't recognized as a builtin
|
|
NoCapture, ///< Function creates no aliases of pointer
|
|
NoDuplicate, ///< Call cannot be duplicated
|
|
NoImplicitFloat, ///< Disable implicit floating point insts
|
|
NoInline, ///< inline=never
|
|
NonLazyBind, ///< Function is called early and/or
|
|
///< often, so lazy binding isn't worthwhile
|
|
NoRedZone, ///< Disable redzone
|
|
NoReturn, ///< Mark the function as not returning
|
|
NoUnwind, ///< Function doesn't unwind stack
|
|
OptimizeForSize, ///< opt_size
|
|
ReadNone, ///< Function does not access memory
|
|
ReadOnly, ///< Function only reads from memory
|
|
Returned, ///< Return value is always equal to this argument
|
|
ReturnsTwice, ///< Function can return twice
|
|
SExt, ///< Sign extended before/after call
|
|
StackAlignment, ///< Alignment of stack for function (3 bits)
|
|
///< stored as log2 of alignment with +1 bias 0
|
|
///< means unaligned (different from
|
|
///< alignstack=(1))
|
|
StackProtect, ///< Stack protection.
|
|
StackProtectReq, ///< Stack protection required.
|
|
StackProtectStrong, ///< Strong Stack protection.
|
|
StructRet, ///< Hidden pointer to structure to return
|
|
SanitizeAddress, ///< AddressSanitizer is on.
|
|
SanitizeThread, ///< ThreadSanitizer is on.
|
|
SanitizeMemory, ///< MemorySanitizer is on.
|
|
UWTable, ///< Function must be in a unwind table
|
|
ZExt, ///< Zero extended before/after call
|
|
|
|
EndAttrKinds ///< Sentinal value useful for loops
|
|
};
|
|
private:
|
|
AttributeImpl *pImpl;
|
|
Attribute(AttributeImpl *A) : pImpl(A) {}
|
|
public:
|
|
Attribute() : pImpl(0) {}
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Attribute Construction
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
/// \brief Return a uniquified Attribute object.
|
|
static Attribute get(LLVMContext &Context, AttrKind Kind, uint64_t Val = 0);
|
|
static Attribute get(LLVMContext &Context, StringRef Kind,
|
|
StringRef Val = StringRef());
|
|
|
|
/// \brief Return a uniquified Attribute object that has the specific
|
|
/// alignment set.
|
|
static Attribute getWithAlignment(LLVMContext &Context, uint64_t Align);
|
|
static Attribute getWithStackAlignment(LLVMContext &Context, uint64_t Align);
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Attribute Accessors
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
/// \brief Return true if the attribute is an Attribute::AttrKind type.
|
|
bool isEnumAttribute() const;
|
|
|
|
/// \brief Return true if the attribute is an alignment attribute.
|
|
bool isAlignAttribute() const;
|
|
|
|
/// \brief Return true if the attribute is a string (target-dependent)
|
|
/// attribute.
|
|
bool isStringAttribute() const;
|
|
|
|
/// \brief Return true if the attribute is present.
|
|
bool hasAttribute(AttrKind Val) const;
|
|
|
|
/// \brief Return true if the target-dependent attribute is present.
|
|
bool hasAttribute(StringRef Val) const;
|
|
|
|
/// \brief Return the attribute's kind as an enum (Attribute::AttrKind). This
|
|
/// requires the attribute to be an enum or alignment attribute.
|
|
Attribute::AttrKind getKindAsEnum() const;
|
|
|
|
/// \brief Return the attribute's value as an integer. This requires that the
|
|
/// attribute be an alignment attribute.
|
|
uint64_t getValueAsInt() const;
|
|
|
|
/// \brief Return the attribute's kind as a string. This requires the
|
|
/// attribute to be a string attribute.
|
|
StringRef getKindAsString() const;
|
|
|
|
/// \brief Return the attribute's value as a string. This requires the
|
|
/// attribute to be a string attribute.
|
|
StringRef getValueAsString() const;
|
|
|
|
/// \brief Returns the alignment field of an attribute as a byte alignment
|
|
/// value.
|
|
unsigned getAlignment() const;
|
|
|
|
/// \brief Returns the stack alignment field of an attribute as a byte
|
|
/// alignment value.
|
|
unsigned getStackAlignment() const;
|
|
|
|
/// \brief The Attribute is converted to a string of equivalent mnemonic. This
|
|
/// is, presumably, for writing out the mnemonics for the assembly writer.
|
|
std::string getAsString(bool InAttrGrp = false) const;
|
|
|
|
/// \brief Equality and non-equality operators.
|
|
bool operator==(Attribute A) const { return pImpl == A.pImpl; }
|
|
bool operator!=(Attribute A) const { return pImpl != A.pImpl; }
|
|
|
|
/// \brief Less-than operator. Useful for sorting the attributes list.
|
|
bool operator<(Attribute A) const;
|
|
|
|
void Profile(FoldingSetNodeID &ID) const {
|
|
ID.AddPointer(pImpl);
|
|
}
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// \class
|
|
/// \brief This class holds the attributes for a function, its return value, and
|
|
/// its parameters. You access the attributes for each of them via an index into
|
|
/// the AttributeSet object. The function attributes are at index
|
|
/// `AttributeSet::FunctionIndex', the return value is at index
|
|
/// `AttributeSet::ReturnIndex', and the attributes for the parameters start at
|
|
/// index `1'.
|
|
class AttributeSet {
|
|
public:
|
|
enum AttrIndex {
|
|
ReturnIndex = 0U,
|
|
FunctionIndex = ~0U
|
|
};
|
|
private:
|
|
friend class AttrBuilder;
|
|
friend class AttributeSetImpl;
|
|
template <typename Ty> friend struct DenseMapInfo;
|
|
|
|
/// \brief The attributes that we are managing. This can be null to represent
|
|
/// the empty attributes list.
|
|
AttributeSetImpl *pImpl;
|
|
|
|
/// \brief The attributes for the specified index are returned.
|
|
AttributeSetNode *getAttributes(unsigned Index) const;
|
|
|
|
/// \brief Create an AttributeSet with the specified parameters in it.
|
|
static AttributeSet get(LLVMContext &C,
|
|
ArrayRef<std::pair<unsigned, Attribute> > Attrs);
|
|
static AttributeSet get(LLVMContext &C,
|
|
ArrayRef<std::pair<unsigned,
|
|
AttributeSetNode*> > Attrs);
|
|
|
|
static AttributeSet getImpl(LLVMContext &C,
|
|
ArrayRef<std::pair<unsigned,
|
|
AttributeSetNode*> > Attrs);
|
|
|
|
|
|
explicit AttributeSet(AttributeSetImpl *LI) : pImpl(LI) {}
|
|
public:
|
|
AttributeSet() : pImpl(0) {}
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// AttributeSet Construction and Mutation
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
/// \brief Return an AttributeSet with the specified parameters in it.
|
|
static AttributeSet get(LLVMContext &C, ArrayRef<AttributeSet> Attrs);
|
|
static AttributeSet get(LLVMContext &C, unsigned Index,
|
|
ArrayRef<Attribute::AttrKind> Kind);
|
|
static AttributeSet get(LLVMContext &C, unsigned Index, AttrBuilder &B);
|
|
|
|
/// \brief Add an attribute to the attribute set at the given index. Since
|
|
/// attribute sets are immutable, this returns a new set.
|
|
AttributeSet addAttribute(LLVMContext &C, unsigned Index,
|
|
Attribute::AttrKind Attr) const;
|
|
|
|
/// \brief Add an attribute to the attribute set at the given index. Since
|
|
/// attribute sets are immutable, this returns a new set.
|
|
AttributeSet addAttribute(LLVMContext &C, unsigned Index,
|
|
StringRef Kind) const;
|
|
|
|
/// \brief Add attributes to the attribute set at the given index. Since
|
|
/// attribute sets are immutable, this returns a new set.
|
|
AttributeSet addAttributes(LLVMContext &C, unsigned Index,
|
|
AttributeSet Attrs) const;
|
|
|
|
/// \brief Remove the specified attribute at the specified index from this
|
|
/// attribute list. Since attribute lists are immutable, this returns the new
|
|
/// list.
|
|
AttributeSet removeAttribute(LLVMContext &C, unsigned Index,
|
|
Attribute::AttrKind Attr) const;
|
|
|
|
/// \brief Remove the specified attributes at the specified index from this
|
|
/// attribute list. Since attribute lists are immutable, this returns the new
|
|
/// list.
|
|
AttributeSet removeAttributes(LLVMContext &C, unsigned Index,
|
|
AttributeSet Attrs) const;
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// AttributeSet Accessors
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
/// \brief Retrieve the LLVM context.
|
|
LLVMContext &getContext() const;
|
|
|
|
/// \brief The attributes for the specified index are returned.
|
|
AttributeSet getParamAttributes(unsigned Index) const;
|
|
|
|
/// \brief The attributes for the ret value are returned.
|
|
AttributeSet getRetAttributes() const;
|
|
|
|
/// \brief The function attributes are returned.
|
|
AttributeSet getFnAttributes() const;
|
|
|
|
/// \brief Return true if the attribute exists at the given index.
|
|
bool hasAttribute(unsigned Index, Attribute::AttrKind Kind) const;
|
|
|
|
/// \brief Return true if the attribute exists at the given index.
|
|
bool hasAttribute(unsigned Index, StringRef Kind) const;
|
|
|
|
/// \brief Return true if attribute exists at the given index.
|
|
bool hasAttributes(unsigned Index) const;
|
|
|
|
/// \brief Return true if the specified attribute is set for at least one
|
|
/// parameter or for the return value.
|
|
bool hasAttrSomewhere(Attribute::AttrKind Attr) const;
|
|
|
|
/// \brief Return the attribute object that exists at the given index.
|
|
Attribute getAttribute(unsigned Index, Attribute::AttrKind Kind) const;
|
|
|
|
/// \brief Return the attribute object that exists at the given index.
|
|
Attribute getAttribute(unsigned Index, StringRef Kind) const;
|
|
|
|
/// \brief Return the alignment for the specified function parameter.
|
|
unsigned getParamAlignment(unsigned Index) const;
|
|
|
|
/// \brief Get the stack alignment.
|
|
unsigned getStackAlignment(unsigned Index) const;
|
|
|
|
/// \brief Return the attributes at the index as a string.
|
|
std::string getAsString(unsigned Index, bool InAttrGrp = false) const;
|
|
|
|
typedef ArrayRef<Attribute>::iterator iterator;
|
|
|
|
iterator begin(unsigned Slot) const;
|
|
iterator end(unsigned Slot) const;
|
|
|
|
/// operator==/!= - Provide equality predicates.
|
|
bool operator==(const AttributeSet &RHS) const {
|
|
return pImpl == RHS.pImpl;
|
|
}
|
|
bool operator!=(const AttributeSet &RHS) const {
|
|
return pImpl != RHS.pImpl;
|
|
}
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// AttributeSet Introspection
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
// FIXME: Remove this.
|
|
uint64_t Raw(unsigned Index) const;
|
|
|
|
/// \brief Return a raw pointer that uniquely identifies this attribute list.
|
|
void *getRawPointer() const {
|
|
return pImpl;
|
|
}
|
|
|
|
/// \brief Return true if there are no attributes.
|
|
bool isEmpty() const {
|
|
return getNumSlots() == 0;
|
|
}
|
|
|
|
/// \brief Return the number of slots used in this attribute list. This is
|
|
/// the number of arguments that have an attribute set on them (including the
|
|
/// function itself).
|
|
unsigned getNumSlots() const;
|
|
|
|
/// \brief Return the index for the given slot.
|
|
unsigned getSlotIndex(unsigned Slot) const;
|
|
|
|
/// \brief Return the attributes at the given slot.
|
|
AttributeSet getSlotAttributes(unsigned Slot) const;
|
|
|
|
void dump() const;
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// \class
|
|
/// \brief Provide DenseMapInfo for AttributeSet.
|
|
template<> struct DenseMapInfo<AttributeSet> {
|
|
static inline AttributeSet getEmptyKey() {
|
|
uintptr_t Val = static_cast<uintptr_t>(-1);
|
|
Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
|
|
return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
|
|
}
|
|
static inline AttributeSet getTombstoneKey() {
|
|
uintptr_t Val = static_cast<uintptr_t>(-2);
|
|
Val <<= PointerLikeTypeTraits<void*>::NumLowBitsAvailable;
|
|
return AttributeSet(reinterpret_cast<AttributeSetImpl*>(Val));
|
|
}
|
|
static unsigned getHashValue(AttributeSet AS) {
|
|
return (unsigned((uintptr_t)AS.pImpl) >> 4) ^
|
|
(unsigned((uintptr_t)AS.pImpl) >> 9);
|
|
}
|
|
static bool isEqual(AttributeSet LHS, AttributeSet RHS) { return LHS == RHS; }
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// \class
|
|
/// \brief This class is used in conjunction with the Attribute::get method to
|
|
/// create an Attribute object. The object itself is uniquified. The Builder's
|
|
/// value, however, is not. So this can be used as a quick way to test for
|
|
/// equality, presence of attributes, etc.
|
|
class AttrBuilder {
|
|
std::bitset<Attribute::EndAttrKinds> Attrs;
|
|
std::map<std::string, std::string> TargetDepAttrs;
|
|
uint64_t Alignment;
|
|
uint64_t StackAlignment;
|
|
public:
|
|
AttrBuilder() : Attrs(0), Alignment(0), StackAlignment(0) {}
|
|
explicit AttrBuilder(uint64_t Val)
|
|
: Attrs(0), Alignment(0), StackAlignment(0) {
|
|
addRawValue(Val);
|
|
}
|
|
AttrBuilder(const Attribute &A) : Attrs(0), Alignment(0), StackAlignment(0) {
|
|
addAttribute(A);
|
|
}
|
|
AttrBuilder(AttributeSet AS, unsigned Idx);
|
|
AttrBuilder(const AttrBuilder &B)
|
|
: Attrs(B.Attrs),
|
|
TargetDepAttrs(B.TargetDepAttrs.begin(), B.TargetDepAttrs.end()),
|
|
Alignment(B.Alignment), StackAlignment(B.StackAlignment) {}
|
|
|
|
void clear();
|
|
|
|
/// \brief Add an attribute to the builder.
|
|
AttrBuilder &addAttribute(Attribute::AttrKind Val);
|
|
|
|
/// \brief Add the Attribute object to the builder.
|
|
AttrBuilder &addAttribute(Attribute A);
|
|
|
|
/// \brief Add the target-dependent attribute to the builder.
|
|
AttrBuilder &addAttribute(StringRef A, StringRef V = StringRef());
|
|
|
|
/// \brief Remove an attribute from the builder.
|
|
AttrBuilder &removeAttribute(Attribute::AttrKind Val);
|
|
|
|
/// \brief Remove the attributes from the builder.
|
|
AttrBuilder &removeAttributes(AttributeSet A, uint64_t Index);
|
|
|
|
/// \brief Remove the target-dependent attribute to the builder.
|
|
AttrBuilder &removeAttribute(StringRef A);
|
|
|
|
/// \brief Add the attributes from the builder.
|
|
AttrBuilder &merge(const AttrBuilder &B);
|
|
|
|
/// \brief Return true if the builder has the specified attribute.
|
|
bool contains(Attribute::AttrKind A) const {
|
|
assert((unsigned)A < Attribute::EndAttrKinds && "Attribute out of range!");
|
|
return Attrs[A];
|
|
}
|
|
|
|
/// \brief Return true if the builder has the specified target-dependent
|
|
/// attribute.
|
|
bool contains(StringRef A) const;
|
|
|
|
/// \brief Return true if the builder has IR-level attributes.
|
|
bool hasAttributes() const;
|
|
|
|
/// \brief Return true if the builder has any attribute that's in the
|
|
/// specified attribute.
|
|
bool hasAttributes(AttributeSet A, uint64_t Index) const;
|
|
|
|
/// \brief Return true if the builder has an alignment attribute.
|
|
bool hasAlignmentAttr() const;
|
|
|
|
/// \brief Retrieve the alignment attribute, if it exists.
|
|
uint64_t getAlignment() const { return Alignment; }
|
|
|
|
/// \brief Retrieve the stack alignment attribute, if it exists.
|
|
uint64_t getStackAlignment() const { return StackAlignment; }
|
|
|
|
/// \brief This turns an int alignment (which must be a power of 2) into the
|
|
/// form used internally in Attribute.
|
|
AttrBuilder &addAlignmentAttr(unsigned Align);
|
|
|
|
/// \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);
|
|
|
|
/// \brief Return true if the builder contains no target-independent
|
|
/// attributes.
|
|
bool empty() const { return Attrs.none(); }
|
|
|
|
// Iterators for target-dependent attributes.
|
|
typedef std::pair<std::string, std::string> td_type;
|
|
typedef std::map<std::string, std::string>::iterator td_iterator;
|
|
typedef std::map<std::string, std::string>::const_iterator td_const_iterator;
|
|
|
|
td_iterator td_begin() { return TargetDepAttrs.begin(); }
|
|
td_iterator td_end() { return TargetDepAttrs.end(); }
|
|
|
|
td_const_iterator td_begin() const { return TargetDepAttrs.begin(); }
|
|
td_const_iterator td_end() const { return TargetDepAttrs.end(); }
|
|
|
|
bool td_empty() const { return TargetDepAttrs.empty(); }
|
|
|
|
bool operator==(const AttrBuilder &B);
|
|
bool operator!=(const AttrBuilder &B) {
|
|
return !(*this == B);
|
|
}
|
|
|
|
// FIXME: Remove this in 4.0.
|
|
|
|
/// \brief Add the raw value to the internal representation.
|
|
AttrBuilder &addRawValue(uint64_t Val);
|
|
};
|
|
|
|
namespace AttributeFuncs {
|
|
|
|
/// \brief Which attributes cannot be applied to a type.
|
|
AttributeSet typeIncompatible(Type *Ty, uint64_t Index);
|
|
|
|
} // end AttributeFuncs namespace
|
|
|
|
} // end llvm namespace
|
|
|
|
#endif
|