mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 16:31:16 +00:00
da63b3ad63
when we don't have one laying around. Useful if you don't have an llvmcontext handy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94468 91177308-0d34-0410-b5e6-96231b3b80d8
336 lines
13 KiB
C++
336 lines
13 KiB
C++
//===-- llvm/Target/TargetData.h - Data size & alignment info ---*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines target properties related to datatype size/offset/alignment
|
|
// information. It uses lazy annotations to cache information about how
|
|
// structure types are laid out and used.
|
|
//
|
|
// This structure should be created once, filled in if the defaults are not
|
|
// correct and then passed around by const&. None of the members functions
|
|
// require modification to the object.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TARGET_TARGETDATA_H
|
|
#define LLVM_TARGET_TARGETDATA_H
|
|
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
|
|
namespace llvm {
|
|
|
|
class Value;
|
|
class Type;
|
|
class IntegerType;
|
|
class StructType;
|
|
class StructLayout;
|
|
class GlobalVariable;
|
|
class LLVMContext;
|
|
|
|
/// Enum used to categorize the alignment types stored by TargetAlignElem
|
|
enum AlignTypeEnum {
|
|
INTEGER_ALIGN = 'i', ///< Integer type alignment
|
|
VECTOR_ALIGN = 'v', ///< Vector type alignment
|
|
FLOAT_ALIGN = 'f', ///< Floating point type alignment
|
|
AGGREGATE_ALIGN = 'a', ///< Aggregate alignment
|
|
STACK_ALIGN = 's' ///< Stack objects alignment
|
|
};
|
|
/// Target alignment element.
|
|
///
|
|
/// Stores the alignment data associated with a given alignment type (pointer,
|
|
/// integer, vector, float) and type bit width.
|
|
///
|
|
/// @note The unusual order of elements in the structure attempts to reduce
|
|
/// padding and make the structure slightly more cache friendly.
|
|
struct TargetAlignElem {
|
|
AlignTypeEnum AlignType : 8; //< Alignment type (AlignTypeEnum)
|
|
unsigned char ABIAlign; //< ABI alignment for this type/bitw
|
|
unsigned char PrefAlign; //< Pref. alignment for this type/bitw
|
|
uint32_t TypeBitWidth; //< Type bit width
|
|
|
|
/// Initializer
|
|
static TargetAlignElem get(AlignTypeEnum align_type, unsigned char abi_align,
|
|
unsigned char pref_align, uint32_t bit_width);
|
|
/// Equality predicate
|
|
bool operator==(const TargetAlignElem &rhs) const;
|
|
};
|
|
|
|
class TargetData : public ImmutablePass {
|
|
private:
|
|
bool LittleEndian; ///< Defaults to false
|
|
unsigned char PointerMemSize; ///< Pointer size in bytes
|
|
unsigned char PointerABIAlign; ///< Pointer ABI alignment
|
|
unsigned char PointerPrefAlign; ///< Pointer preferred alignment
|
|
|
|
SmallVector<unsigned char, 8> LegalIntWidths; ///< Legal Integers.
|
|
|
|
/// Alignments- Where the primitive type alignment data is stored.
|
|
///
|
|
/// @sa init().
|
|
/// @note Could support multiple size pointer alignments, e.g., 32-bit
|
|
/// pointers vs. 64-bit pointers by extending TargetAlignment, but for now,
|
|
/// we don't.
|
|
SmallVector<TargetAlignElem, 16> Alignments;
|
|
|
|
/// InvalidAlignmentElem - This member is a signal that a requested alignment
|
|
/// type and bit width were not found in the SmallVector.
|
|
static const TargetAlignElem InvalidAlignmentElem;
|
|
|
|
// The StructType -> StructLayout map.
|
|
mutable void *LayoutMap;
|
|
|
|
//! Set/initialize target alignments
|
|
void setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
|
|
unsigned char pref_align, uint32_t bit_width);
|
|
unsigned getAlignmentInfo(AlignTypeEnum align_type, uint32_t bit_width,
|
|
bool ABIAlign, const Type *Ty) const;
|
|
//! Internal helper method that returns requested alignment for type.
|
|
unsigned char getAlignment(const Type *Ty, bool abi_or_pref) const;
|
|
|
|
/// Valid alignment predicate.
|
|
///
|
|
/// Predicate that tests a TargetAlignElem reference returned by get() against
|
|
/// InvalidAlignmentElem.
|
|
bool validAlignment(const TargetAlignElem &align) const {
|
|
return &align != &InvalidAlignmentElem;
|
|
}
|
|
|
|
public:
|
|
/// Default ctor.
|
|
///
|
|
/// @note This has to exist, because this is a pass, but it should never be
|
|
/// used.
|
|
TargetData();
|
|
|
|
/// Constructs a TargetData from a specification string. See init().
|
|
explicit TargetData(StringRef TargetDescription)
|
|
: ImmutablePass(&ID) {
|
|
init(TargetDescription);
|
|
}
|
|
|
|
/// Initialize target data from properties stored in the module.
|
|
explicit TargetData(const Module *M);
|
|
|
|
TargetData(const TargetData &TD) :
|
|
ImmutablePass(&ID),
|
|
LittleEndian(TD.isLittleEndian()),
|
|
PointerMemSize(TD.PointerMemSize),
|
|
PointerABIAlign(TD.PointerABIAlign),
|
|
PointerPrefAlign(TD.PointerPrefAlign),
|
|
LegalIntWidths(TD.LegalIntWidths),
|
|
Alignments(TD.Alignments),
|
|
LayoutMap(0)
|
|
{ }
|
|
|
|
~TargetData(); // Not virtual, do not subclass this class
|
|
|
|
//! Parse a target data layout string and initialize TargetData alignments.
|
|
void init(StringRef TargetDescription);
|
|
|
|
/// Target endianness...
|
|
bool isLittleEndian() const { return LittleEndian; }
|
|
bool isBigEndian() const { return !LittleEndian; }
|
|
|
|
/// getStringRepresentation - Return the string representation of the
|
|
/// TargetData. This representation is in the same format accepted by the
|
|
/// string constructor above.
|
|
std::string getStringRepresentation() const;
|
|
|
|
/// isLegalInteger - This function returns true if the specified type is
|
|
/// known tobe a native integer type supported by the CPU. For example,
|
|
/// i64 is not native on most 32-bit CPUs and i37 is not native on any known
|
|
/// one. This returns false if the integer width is not legal.
|
|
///
|
|
/// The width is specified in bits.
|
|
///
|
|
bool isLegalInteger(unsigned Width) const {
|
|
for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
|
|
if (LegalIntWidths[i] == Width)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
bool isIllegalInteger(unsigned Width) const {
|
|
return !isLegalInteger(Width);
|
|
}
|
|
|
|
/// Target pointer alignment
|
|
unsigned char getPointerABIAlignment() const { return PointerABIAlign; }
|
|
/// Return target's alignment for stack-based pointers
|
|
unsigned char getPointerPrefAlignment() const { return PointerPrefAlign; }
|
|
/// Target pointer size
|
|
unsigned char getPointerSize() const { return PointerMemSize; }
|
|
/// Target pointer size, in bits
|
|
unsigned char getPointerSizeInBits() const { return 8*PointerMemSize; }
|
|
|
|
/// Size examples:
|
|
///
|
|
/// Type SizeInBits StoreSizeInBits AllocSizeInBits[*]
|
|
/// ---- ---------- --------------- ---------------
|
|
/// i1 1 8 8
|
|
/// i8 8 8 8
|
|
/// i19 19 24 32
|
|
/// i32 32 32 32
|
|
/// i100 100 104 128
|
|
/// i128 128 128 128
|
|
/// Float 32 32 32
|
|
/// Double 64 64 64
|
|
/// X86_FP80 80 80 96
|
|
///
|
|
/// [*] The alloc size depends on the alignment, and thus on the target.
|
|
/// These values are for x86-32 linux.
|
|
|
|
/// getTypeSizeInBits - Return the number of bits necessary to hold the
|
|
/// specified type. For example, returns 36 for i36 and 80 for x86_fp80.
|
|
uint64_t getTypeSizeInBits(const Type* Ty) const;
|
|
|
|
/// getTypeStoreSize - Return the maximum number of bytes that may be
|
|
/// overwritten by storing the specified type. For example, returns 5
|
|
/// for i36 and 10 for x86_fp80.
|
|
uint64_t getTypeStoreSize(const Type *Ty) const {
|
|
return (getTypeSizeInBits(Ty)+7)/8;
|
|
}
|
|
|
|
/// getTypeStoreSizeInBits - Return the maximum number of bits that may be
|
|
/// overwritten by storing the specified type; always a multiple of 8. For
|
|
/// example, returns 40 for i36 and 80 for x86_fp80.
|
|
uint64_t getTypeStoreSizeInBits(const Type *Ty) const {
|
|
return 8*getTypeStoreSize(Ty);
|
|
}
|
|
|
|
/// getTypeAllocSize - Return the offset in bytes between successive objects
|
|
/// of the specified type, including alignment padding. This is the amount
|
|
/// that alloca reserves for this type. For example, returns 12 or 16 for
|
|
/// x86_fp80, depending on alignment.
|
|
uint64_t getTypeAllocSize(const Type* Ty) const {
|
|
// Round up to the next alignment boundary.
|
|
return RoundUpAlignment(getTypeStoreSize(Ty), getABITypeAlignment(Ty));
|
|
}
|
|
|
|
/// getTypeAllocSizeInBits - Return the offset in bits between successive
|
|
/// objects of the specified type, including alignment padding; always a
|
|
/// multiple of 8. This is the amount that alloca reserves for this type.
|
|
/// For example, returns 96 or 128 for x86_fp80, depending on alignment.
|
|
uint64_t getTypeAllocSizeInBits(const Type* Ty) const {
|
|
return 8*getTypeAllocSize(Ty);
|
|
}
|
|
|
|
/// getABITypeAlignment - Return the minimum ABI-required alignment for the
|
|
/// specified type.
|
|
unsigned char getABITypeAlignment(const Type *Ty) const;
|
|
|
|
/// getABIIntegerTypeAlignment - Return the minimum ABI-required alignment for
|
|
/// an integer type of the specified bitwidth.
|
|
unsigned char getABIIntegerTypeAlignment(unsigned BitWidth) const;
|
|
|
|
|
|
/// getCallFrameTypeAlignment - Return the minimum ABI-required alignment
|
|
/// for the specified type when it is part of a call frame.
|
|
unsigned char getCallFrameTypeAlignment(const Type *Ty) const;
|
|
|
|
|
|
/// getPrefTypeAlignment - Return the preferred stack/global alignment for
|
|
/// the specified type. This is always at least as good as the ABI alignment.
|
|
unsigned char getPrefTypeAlignment(const Type *Ty) const;
|
|
|
|
/// getPreferredTypeAlignmentShift - Return the preferred alignment for the
|
|
/// specified type, returned as log2 of the value (a shift amount).
|
|
///
|
|
unsigned char getPreferredTypeAlignmentShift(const Type *Ty) const;
|
|
|
|
/// getIntPtrType - Return an unsigned integer type that is the same size or
|
|
/// greater to the host pointer size.
|
|
///
|
|
const IntegerType *getIntPtrType(LLVMContext &C) const;
|
|
|
|
/// getIndexedOffset - return the offset from the beginning of the type for
|
|
/// the specified indices. This is used to implement getelementptr.
|
|
///
|
|
uint64_t getIndexedOffset(const Type *Ty,
|
|
Value* const* Indices, unsigned NumIndices) const;
|
|
|
|
/// getStructLayout - Return a StructLayout object, indicating the alignment
|
|
/// of the struct, its size, and the offsets of its fields. Note that this
|
|
/// information is lazily cached.
|
|
const StructLayout *getStructLayout(const StructType *Ty) const;
|
|
|
|
/// InvalidateStructLayoutInfo - TargetData speculatively caches StructLayout
|
|
/// objects. If a TargetData object is alive when types are being refined and
|
|
/// removed, this method must be called whenever a StructType is removed to
|
|
/// avoid a dangling pointer in this cache.
|
|
void InvalidateStructLayoutInfo(const StructType *Ty) const;
|
|
|
|
/// getPreferredAlignment - Return the preferred alignment of the specified
|
|
/// global. This includes an explicitly requested alignment (if the global
|
|
/// has one).
|
|
unsigned getPreferredAlignment(const GlobalVariable *GV) const;
|
|
|
|
/// getPreferredAlignmentLog - Return the preferred alignment of the
|
|
/// specified global, returned in log form. This includes an explicitly
|
|
/// requested alignment (if the global has one).
|
|
unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const;
|
|
|
|
/// RoundUpAlignment - Round the specified value up to the next alignment
|
|
/// boundary specified by Alignment. For example, 7 rounded up to an
|
|
/// alignment boundary of 4 is 8. 8 rounded up to the alignment boundary of 4
|
|
/// is 8 because it is already aligned.
|
|
template <typename UIntTy>
|
|
static UIntTy RoundUpAlignment(UIntTy Val, unsigned Alignment) {
|
|
assert((Alignment & (Alignment-1)) == 0 && "Alignment must be power of 2!");
|
|
return (Val + (Alignment-1)) & ~UIntTy(Alignment-1);
|
|
}
|
|
|
|
static char ID; // Pass identification, replacement for typeid
|
|
};
|
|
|
|
/// StructLayout - used to lazily calculate structure layout information for a
|
|
/// target machine, based on the TargetData structure.
|
|
///
|
|
class StructLayout {
|
|
uint64_t StructSize;
|
|
unsigned StructAlignment;
|
|
unsigned NumElements;
|
|
uint64_t MemberOffsets[1]; // variable sized array!
|
|
public:
|
|
|
|
uint64_t getSizeInBytes() const {
|
|
return StructSize;
|
|
}
|
|
|
|
uint64_t getSizeInBits() const {
|
|
return 8*StructSize;
|
|
}
|
|
|
|
unsigned getAlignment() const {
|
|
return StructAlignment;
|
|
}
|
|
|
|
/// getElementContainingOffset - Given a valid byte offset into the structure,
|
|
/// return the structure index that contains it.
|
|
///
|
|
unsigned getElementContainingOffset(uint64_t Offset) const;
|
|
|
|
uint64_t getElementOffset(unsigned Idx) const {
|
|
assert(Idx < NumElements && "Invalid element idx!");
|
|
return MemberOffsets[Idx];
|
|
}
|
|
|
|
uint64_t getElementOffsetInBits(unsigned Idx) const {
|
|
return getElementOffset(Idx)*8;
|
|
}
|
|
|
|
private:
|
|
friend class TargetData; // Only TargetData can create this class
|
|
StructLayout(const StructType *ST, const TargetData &TD);
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|