mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
244 lines
9.1 KiB
C++
244 lines
9.1 KiB
C++
//===-- llvm/Target/TargetData.h - Data size & alignment info ---*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and 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/Support/DataTypes.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include <string>
|
|
|
|
namespace llvm {
|
|
|
|
class Value;
|
|
class Type;
|
|
class StructType;
|
|
class StructLayout;
|
|
class GlobalVariable;
|
|
|
|
/// 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
|
|
};
|
|
/// 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;
|
|
/// output stream operator
|
|
std::ostream &dump(std::ostream &os) 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
|
|
|
|
//! 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;
|
|
//! Alignment iterator shorthand
|
|
typedef SmallVector<TargetAlignElem, 16>::iterator align_iterator;
|
|
//! Constant alignment iterator shorthand
|
|
typedef SmallVector<TargetAlignElem, 16>::const_iterator align_const_iterator;
|
|
//! Invalid alignment.
|
|
/*!
|
|
This member is a signal that a requested alignment type and bit width were
|
|
not found in the SmallVector.
|
|
*/
|
|
static const TargetAlignElem InvalidAlignmentElem;
|
|
|
|
//! 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;
|
|
//! 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.
|
|
inline 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() : ImmutablePass((intptr_t)&ID) {
|
|
assert(0 && "ERROR: Bad TargetData ctor used. "
|
|
"Tool did not specify a TargetData to use?");
|
|
abort();
|
|
}
|
|
|
|
/// Constructs a TargetData from a specification string. See init().
|
|
explicit TargetData(const std::string &TargetDescription)
|
|
: ImmutablePass((intptr_t)&ID) {
|
|
init(TargetDescription);
|
|
}
|
|
|
|
/// Initialize target data from properties stored in the module.
|
|
explicit TargetData(const Module *M);
|
|
|
|
TargetData(const TargetData &TD) :
|
|
ImmutablePass((intptr_t)&ID),
|
|
LittleEndian(TD.isLittleEndian()),
|
|
PointerMemSize(TD.PointerMemSize),
|
|
PointerABIAlign(TD.PointerABIAlign),
|
|
PointerPrefAlign(TD.PointerPrefAlign),
|
|
Alignments(TD.Alignments)
|
|
{ }
|
|
|
|
~TargetData(); // Not virtual, do not subclass this class
|
|
|
|
//! Parse a target data layout string and initialize TargetData alignments.
|
|
void init(const std::string &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;
|
|
/// 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; }
|
|
|
|
/// getTypeSize - Return the number of bytes necessary to hold the specified
|
|
/// type.
|
|
uint64_t getTypeSize(const Type *Ty) const;
|
|
|
|
/// getTypeSizeInBits - Return the number of bits necessary to hold the
|
|
/// specified type.
|
|
uint64_t getTypeSizeInBits(const Type* Ty) const;
|
|
|
|
/// getABITypeAlignment - Return the minimum ABI-required alignment for the
|
|
/// specified type.
|
|
unsigned char getABITypeAlignment(const Type *Ty) const;
|
|
|
|
/// getPrefTypeAlignment - Return the preferred stack/global alignment for
|
|
/// the specified type.
|
|
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 Type *getIntPtrType() 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;
|
|
|
|
/// 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;
|
|
|
|
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;
|
|
}
|
|
|
|
unsigned getAlignment() const {
|
|
return StructAlignment;
|
|
}
|
|
|
|
/// getElementContainingOffset - Given a valid 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];
|
|
}
|
|
|
|
private:
|
|
friend class TargetData; // Only TargetData can create this class
|
|
StructLayout(const StructType *ST, const TargetData &TD);
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|