#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Type.h"
#include "llvm/Pass.h"
#include "llvm/Support/DataTypes.h"
+// This needs to be outside of the namespace, to avoid conflict with llvm-c
+// decl.
+typedef struct LLVMOpaqueTargetData *LLVMTargetDataRef;
+
namespace llvm {
class Value;
class IntegerType;
class StructType;
class StructLayout;
+class Triple;
class GlobalVariable;
class LLVMContext;
template<typename T>
/// Enum used to categorize the alignment types stored by LayoutAlignElem
enum AlignTypeEnum {
- INVALID_ALIGN = 0, ///< An invalid alignment
- 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
+ INVALID_ALIGN = 0,
+ INTEGER_ALIGN = 'i',
+ VECTOR_ALIGN = 'v',
+ FLOAT_ALIGN = 'f',
+ AGGREGATE_ALIGN = 'a'
};
-/// Layout alignment element.
+// FIXME: Currently the DataLayout string carries a "preferred alignment"
+// for types. As the DataLayout is module/global, this should likely be
+// sunk down to an FTTI element that is queried rather than a global
+// preference.
+
+/// \brief Layout alignment element.
///
/// Stores the alignment data associated with a given alignment type (integer,
/// vector, float) and type bit width.
///
-/// @note The unusual order of elements in the structure attempts to reduce
+/// \note The unusual order of elements in the structure attempts to reduce
/// padding and make the structure slightly more cache friendly.
struct LayoutAlignElem {
- unsigned AlignType : 8; ///< Alignment type (AlignTypeEnum)
- unsigned TypeBitWidth : 24; ///< Type bit width
- unsigned ABIAlign : 16; ///< ABI alignment for this type/bitw
- unsigned PrefAlign : 16; ///< Pref. alignment for this type/bitw
+ /// \brief Alignment type from \c AlignTypeEnum
+ unsigned AlignType : 8;
+ unsigned TypeBitWidth : 24;
+ unsigned ABIAlign : 16;
+ unsigned PrefAlign : 16;
- /// Initializer
static LayoutAlignElem get(AlignTypeEnum align_type, unsigned abi_align,
unsigned pref_align, uint32_t bit_width);
- /// Equality predicate
bool operator==(const LayoutAlignElem &rhs) const;
};
-/// Layout pointer alignment element.
+/// \brief Layout pointer alignment element.
///
/// Stores the alignment data associated with a given pointer and address space.
///
-/// @note The unusual order of elements in the structure attempts to reduce
+/// \note The unusual order of elements in the structure attempts to reduce
/// padding and make the structure slightly more cache friendly.
struct PointerAlignElem {
- unsigned ABIAlign; ///< ABI alignment for this type/bitw
- unsigned PrefAlign; ///< Pref. alignment for this type/bitw
- uint32_t TypeBitWidth; ///< Type bit width
- uint32_t AddressSpace; ///< Address space for the pointer type
+ unsigned ABIAlign;
+ unsigned PrefAlign;
+ uint32_t TypeByteWidth;
+ uint32_t AddressSpace;
/// Initializer
- static PointerAlignElem get(uint32_t addr_space, unsigned abi_align,
- unsigned pref_align, uint32_t bit_width);
- /// Equality predicate
+ static PointerAlignElem get(uint32_t AddressSpace, unsigned ABIAlign,
+ unsigned PrefAlign, uint32_t TypeByteWidth);
bool operator==(const PointerAlignElem &rhs) const;
};
-
-/// DataLayout - This class holds a parsed version of the target data layout
-/// string in a module and provides methods for querying it. The target data
-/// layout string is specified *by the target* - a frontend generating LLVM IR
-/// is required to generate the right target data for the target being codegen'd
-/// to. If some measure of portability is desired, an empty string may be
-/// specified in the module.
-class DataLayout : public ImmutablePass {
+/// \brief A parsed version of the target data layout string in and methods for
+/// querying it.
+///
+/// The target data layout string is specified *by the target* - a frontend
+/// generating LLVM IR is required to generate the right target data for the
+/// target being codegen'd to.
+class DataLayout {
private:
- bool LittleEndian; ///< Defaults to false
- unsigned StackNaturalAlign; ///< Stack natural alignment
+ /// Defaults to false.
+ bool BigEndian;
- SmallVector<unsigned char, 8> LegalIntWidths; ///< Legal Integers.
+ unsigned StackNaturalAlign;
- /// 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 LayoutAlignment, but for now,
- /// we don't.
+ enum ManglingModeT {
+ MM_None,
+ MM_ELF,
+ MM_MachO,
+ MM_WinCOFF,
+ MM_WinCOFFX86,
+ MM_Mips
+ };
+ ManglingModeT ManglingMode;
+
+ SmallVector<unsigned char, 8> LegalIntWidths;
+
+ /// \brief Primitive type alignment data.
SmallVector<LayoutAlignElem, 16> Alignments;
- DenseMap<unsigned, PointerAlignElem> Pointers;
- /// InvalidAlignmentElem - This member is a signal that a requested alignment
- /// type and bit width were not found in the SmallVector.
+ /// \brief The string representation used to create this DataLayout
+ std::string StringRepresentation;
+
+ typedef SmallVector<PointerAlignElem, 8> PointersTy;
+ PointersTy Pointers;
+
+ PointersTy::const_iterator
+ findPointerLowerBound(uint32_t AddressSpace) const {
+ return const_cast<DataLayout *>(this)->findPointerLowerBound(AddressSpace);
+ }
+
+ PointersTy::iterator findPointerLowerBound(uint32_t AddressSpace);
+
+ /// This member is a signal that a requested alignment type and bit width were
+ /// not found in the SmallVector.
static const LayoutAlignElem InvalidAlignmentElem;
- /// InvalidPointerElem - This member is a signal that a requested pointer
- /// type and bit width were not found in the DenseSet.
+ /// This member is a signal that a requested pointer type and bit width were
+ /// not found in the DenseSet.
static const PointerAlignElem InvalidPointerElem;
// The StructType -> StructLayout map.
mutable void *LayoutMap;
- //! Set/initialize target alignments
void setAlignment(AlignTypeEnum align_type, unsigned abi_align,
unsigned pref_align, uint32_t bit_width);
unsigned getAlignmentInfo(AlignTypeEnum align_type, uint32_t bit_width,
bool ABIAlign, Type *Ty) const;
+ void setPointerAlignment(uint32_t AddrSpace, unsigned ABIAlign,
+ unsigned PrefAlign, uint32_t TypeByteWidth);
- //! Set/initialize pointer alignments
- void setPointerAlignment(uint32_t addr_space, unsigned abi_align,
- unsigned pref_align, uint32_t bit_width);
-
- //! Internal helper method that returns requested alignment for type.
+ /// Internal helper method that returns requested alignment for type.
unsigned getAlignment(Type *Ty, bool abi_or_pref) const;
- /// Valid alignment predicate.
+ /// \brief Valid alignment predicate.
///
/// Predicate that tests a LayoutAlignElem reference returned by get() against
/// InvalidAlignmentElem.
return &align != &InvalidAlignmentElem;
}
- /// Valid pointer predicate.
+ /// \brief Valid pointer predicate.
///
- /// Predicate that tests a PointerAlignElem reference returned by get() against
- /// InvalidPointerElem.
+ /// Predicate that tests a PointerAlignElem reference returned by get()
+ /// against \c InvalidPointerElem.
bool validPointer(const PointerAlignElem &align) const {
return &align != &InvalidPointerElem;
}
/// malformed.
void parseSpecifier(StringRef LayoutDescription);
+ // Free all internal data structures.
+ void clear();
+
public:
- /// Default ctor.
- ///
- /// @note This has to exist, because this is a pass, but it should never be
- /// used.
- DataLayout();
-
- /// Constructs a DataLayout from a specification string. See init().
- explicit DataLayout(StringRef LayoutDescription)
- : ImmutablePass(ID) {
- init(LayoutDescription);
+ /// Constructs a DataLayout from a specification string. See reset().
+ explicit DataLayout(StringRef LayoutDescription) : LayoutMap(nullptr) {
+ reset(LayoutDescription);
}
/// Initialize target data from properties stored in the module.
explicit DataLayout(const Module *M);
- DataLayout(const DataLayout &TD) :
- ImmutablePass(ID),
- LittleEndian(TD.isLittleEndian()),
- LegalIntWidths(TD.LegalIntWidths),
- Alignments(TD.Alignments),
- Pointers(TD.Pointers),
- LayoutMap(0)
- { }
+ void init(const Module *M);
- ~DataLayout(); // Not virtual, do not subclass this class
+ DataLayout(const DataLayout &DL) : LayoutMap(nullptr) { *this = DL; }
- /// Parse a data layout string (with fallback to default values). Ensure that
- /// the data layout pass is registered.
- void init(StringRef LayoutDescription);
+ DataLayout &operator=(const DataLayout &DL) {
+ clear();
+ StringRepresentation = DL.StringRepresentation;
+ BigEndian = DL.isBigEndian();
+ StackNaturalAlign = DL.StackNaturalAlign;
+ ManglingMode = DL.ManglingMode;
+ LegalIntWidths = DL.LegalIntWidths;
+ Alignments = DL.Alignments;
+ Pointers = DL.Pointers;
+ return *this;
+ }
+
+ bool operator==(const DataLayout &Other) const;
+ bool operator!=(const DataLayout &Other) const { return !(*this == Other); }
+
+ ~DataLayout(); // Not virtual, do not subclass this class
+
+ /// Parse a data layout string (with fallback to default values).
+ void reset(StringRef LayoutDescription);
/// Layout endianness...
- bool isLittleEndian() const { return LittleEndian; }
- bool isBigEndian() const { return !LittleEndian; }
-
- /// getStringRepresentation - Return the string representation of the
- /// DataLayout. 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 to be 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.
+ bool isLittleEndian() const { return !BigEndian; }
+ bool isBigEndian() const { return BigEndian; }
+
+ /// \brief Returns the string representation of the DataLayout.
///
- /// The width is specified in bits.
+ /// This representation is in the same format accepted by the string
+ /// constructor above. This should not be used to compare two DataLayout as
+ /// different string can represent the same layout.
+ const std::string &getStringRepresentation() const {
+ return StringRepresentation;
+ }
+
+ /// \brief Test if the DataLayout was constructed from an empty string.
+ bool isDefault() const { return StringRepresentation.empty(); }
+
+ /// \brief Returns true if the specified type is known to be 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)
+ for (unsigned LegalIntWidth : LegalIntWidths)
+ if (LegalIntWidth == Width)
return true;
return false;
}
- bool isIllegalInteger(unsigned Width) const {
- return !isLegalInteger(Width);
- }
+ bool isIllegalInteger(unsigned Width) const { return !isLegalInteger(Width); }
/// Returns true if the given alignment exceeds the natural stack alignment.
bool exceedsNaturalStackAlignment(unsigned Align) const {
return (StackNaturalAlign != 0) && (Align > StackNaturalAlign);
}
- /// fitsInLegalInteger - This function returns true if the specified type fits
- /// in a native integer type supported by the CPU. For example, if the CPU
- /// only supports i32 as a native integer type, then i27 fits in a legal
- // integer type but i45 does not.
+ unsigned getStackAlignment() const { return StackNaturalAlign; }
+
+ bool hasMicrosoftFastStdCallMangling() const {
+ return ManglingMode == MM_WinCOFFX86;
+ }
+
+ bool hasLinkerPrivateGlobalPrefix() const { return ManglingMode == MM_MachO; }
+
+ const char *getLinkerPrivateGlobalPrefix() const {
+ if (ManglingMode == MM_MachO)
+ return "l";
+ return "";
+ }
+
+ char getGlobalPrefix() const {
+ switch (ManglingMode) {
+ case MM_None:
+ case MM_ELF:
+ case MM_Mips:
+ case MM_WinCOFF:
+ return '\0';
+ case MM_MachO:
+ case MM_WinCOFFX86:
+ return '_';
+ }
+ llvm_unreachable("invalid mangling mode");
+ }
+
+ const char *getPrivateGlobalPrefix() const {
+ switch (ManglingMode) {
+ case MM_None:
+ return "";
+ case MM_ELF:
+ return ".L";
+ case MM_Mips:
+ return "$";
+ case MM_MachO:
+ case MM_WinCOFF:
+ case MM_WinCOFFX86:
+ return "L";
+ }
+ llvm_unreachable("invalid mangling mode");
+ }
+
+ static const char *getManglingComponent(const Triple &T);
+
+ /// \brief Returns true if the specified type fits in a native integer type
+ /// supported by the CPU.
+ ///
+ /// For example, if the CPU only supports i32 as a native integer type, then
+ /// i27 fits in a legal integer type but i45 does not.
bool fitsInLegalInteger(unsigned Width) const {
- for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
- if (Width <= LegalIntWidths[i])
+ for (unsigned LegalIntWidth : LegalIntWidths)
+ if (Width <= LegalIntWidth)
return true;
return false;
}
/// Layout pointer alignment
/// FIXME: The defaults need to be removed once all of
/// the backends/clients are updated.
- unsigned getPointerABIAlignment(unsigned AS = 0) const {
- DenseMap<unsigned, PointerAlignElem>::const_iterator val = Pointers.find(AS);
- if (val == Pointers.end()) {
- val = Pointers.find(0);
- }
- return val->second.ABIAlign;
- }
+ unsigned getPointerABIAlignment(unsigned AS = 0) const;
+
/// Return target's alignment for stack-based pointers
/// FIXME: The defaults need to be removed once all of
/// the backends/clients are updated.
- unsigned getPointerPrefAlignment(unsigned AS = 0) const {
- DenseMap<unsigned, PointerAlignElem>::const_iterator val = Pointers.find(AS);
- if (val == Pointers.end()) {
- val = Pointers.find(0);
- }
- return val->second.PrefAlign;
- }
+ unsigned getPointerPrefAlignment(unsigned AS = 0) const;
+
/// Layout pointer size
/// FIXME: The defaults need to be removed once all of
/// the backends/clients are updated.
- unsigned getPointerSize(unsigned AS = 0) const {
- DenseMap<unsigned, PointerAlignElem>::const_iterator val = Pointers.find(AS);
- if (val == Pointers.end()) {
- val = Pointers.find(0);
- }
- return val->second.TypeBitWidth;
- }
+ unsigned getPointerSize(unsigned AS = 0) const;
+
/// Layout pointer size, in bits
/// FIXME: The defaults need to be removed once all of
/// the backends/clients are updated.
- unsigned getPointerSizeInBits(unsigned AS = 0) const {
+ unsigned getPointerSizeInBits(unsigned AS = 0) const {
return getPointerSize(AS) * 8;
}
+
+ /// Layout pointer size, in bits, based on the type. If this function is
+ /// called with a pointer type, then the type size of the pointer is returned.
+ /// If this function is called with a vector of pointers, then the type size
+ /// of the pointer is returned. This should only be called with a pointer or
+ /// vector of pointers.
+ unsigned getPointerTypeSizeInBits(Type *) const;
+
+ unsigned getPointerTypeSize(Type *Ty) const {
+ return getPointerTypeSizeInBits(Ty) / 8;
+ }
+
/// Size examples:
///
/// Type SizeInBits StoreSizeInBits AllocSizeInBits[*]
/// [*] 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.
- /// The type passed must have a size (Type::isSized() must return true).
- uint64_t getTypeSizeInBits(Type* Ty) const;
+ /// \brief Returns the number of bits necessary to hold the specified type.
+ ///
+ /// For example, returns 36 for i36 and 80 for x86_fp80. The type passed must
+ /// have a size (Type::isSized() must return true).
+ uint64_t getTypeSizeInBits(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.
+ /// \brief Returns 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(Type *Ty) const {
- return (getTypeSizeInBits(Ty)+7)/8;
+ 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.
+ /// \brief Returns 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(Type *Ty) const {
- return 8*getTypeStoreSize(Ty);
+ 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(Type* Ty) const {
+ /// \brief Returns 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(Type *Ty) const {
// Round up to the next alignment boundary.
- return RoundUpAlignment(getTypeStoreSize(Ty), getABITypeAlignment(Ty));
+ return RoundUpToAlignment(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(Type* Ty) const {
- return 8*getTypeAllocSize(Ty);
+ /// \brief Returns 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(Type *Ty) const {
+ return 8 * getTypeAllocSize(Ty);
}
- /// getABITypeAlignment - Return the minimum ABI-required alignment for the
- /// specified type.
+ /// \brief Returns the minimum ABI-required alignment for the specified type.
unsigned getABITypeAlignment(Type *Ty) const;
- /// getABIIntegerTypeAlignment - Return the minimum ABI-required alignment for
- /// an integer type of the specified bitwidth.
+ /// \brief Returns the minimum ABI-required alignment for an integer type of
+ /// the specified bitwidth.
unsigned getABIIntegerTypeAlignment(unsigned BitWidth) const;
- /// getCallFrameTypeAlignment - Return the minimum ABI-required alignment
- /// for the specified type when it is part of a call frame.
- unsigned getCallFrameTypeAlignment(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.
+ /// \brief Returns the preferred stack/global alignment for the specified
+ /// type.
+ ///
+ /// This is always at least as good as the ABI alignment.
unsigned getPrefTypeAlignment(Type *Ty) const;
- /// getPreferredTypeAlignmentShift - Return the preferred alignment for the
- /// specified type, returned as log2 of the value (a shift amount).
+ /// \brief Returns the preferred alignment for the specified type, returned as
+ /// log2 of the value (a shift amount).
unsigned getPreferredTypeAlignmentShift(Type *Ty) const;
- /// getIntPtrType - Return an integer type with size at least as big as that
- /// of a pointer in the given address space.
+ /// \brief Returns an integer type with size at least as big as that of a
+ /// pointer in the given address space.
IntegerType *getIntPtrType(LLVMContext &C, unsigned AddressSpace = 0) const;
- /// getIntPtrType - Return an integer (vector of integer) type with size at
- /// least as big as that of a pointer of the given pointer (vector of pointer)
- /// type.
+ /// \brief Returns an integer (vector of integer) type with size at least as
+ /// big as that of a pointer of the given pointer (vector of pointer) type.
Type *getIntPtrType(Type *) const;
- /// getIndexedOffset - return the offset from the beginning of the type for
- /// the specified indices. This is used to implement getelementptr.
+ /// \brief Returns the smallest integer type with size at least as big as
+ /// Width bits.
+ Type *getSmallestLegalIntType(LLVMContext &C, unsigned Width = 0) const;
+
+ /// \brief Returns the largest legal integer type, or null if none are set.
+ Type *getLargestLegalIntType(LLVMContext &C) const {
+ unsigned LargestSize = getLargestLegalIntTypeSize();
+ return (LargestSize == 0) ? nullptr : Type::getIntNTy(C, LargestSize);
+ }
+
+ /// \brief Returns the size of largest legal integer type size, or 0 if none
+ /// are set.
+ unsigned getLargestLegalIntTypeSize() const;
+
+ /// \brief Returns the offset from the beginning of the type for the specified
+ /// indices.
+ ///
+ /// This is used to implement getelementptr.
uint64_t getIndexedOffset(Type *Ty, ArrayRef<Value *> Indices) 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.
+ /// \brief Returns 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(StructType *Ty) const;
- /// getPreferredAlignment - Return the preferred alignment of the specified
- /// global. This includes an explicitly requested alignment (if the global
- /// has one).
+ /// \brief Returns 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).
+ /// \brief Returns 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);
- }
+inline DataLayout *unwrap(LLVMTargetDataRef P) {
+ return reinterpret_cast<DataLayout *>(P);
+}
- static char ID; // Pass identification, replacement for typeid
-};
+inline LLVMTargetDataRef wrap(const DataLayout *P) {
+ return reinterpret_cast<LLVMTargetDataRef>(const_cast<DataLayout *>(P));
+}
-/// StructLayout - used to lazily calculate structure layout information for a
-/// target machine, based on the DataLayout structure.
-///
+/// Used to lazily calculate structure layout information for a target machine,
+/// based on the DataLayout structure.
class StructLayout {
uint64_t StructSize;
unsigned StructAlignment;
- unsigned NumElements;
- uint64_t MemberOffsets[1]; // variable sized array!
+ bool IsPadded : 1;
+ unsigned NumElements : 31;
+ uint64_t MemberOffsets[1]; // variable sized array!
public:
+ uint64_t getSizeInBytes() const { return StructSize; }
- uint64_t getSizeInBytes() const {
- return StructSize;
- }
+ uint64_t getSizeInBits() const { return 8 * StructSize; }
- uint64_t getSizeInBits() const {
- return 8*StructSize;
- }
+ unsigned getAlignment() const { return StructAlignment; }
- unsigned getAlignment() const {
- return StructAlignment;
- }
+ /// Returns whether the struct has padding or not between its fields.
+ /// NB: Padding in nested element is not taken into account.
+ bool hasPadding() const { return IsPadded; }
- /// getElementContainingOffset - Given a valid byte offset into the structure,
- /// return the structure index that contains it.
- ///
+ /// \brief Given a valid byte offset into the structure, returns the structure
+ /// index that contains it.
unsigned getElementContainingOffset(uint64_t Offset) const;
uint64_t getElementOffset(unsigned Idx) const {
}
uint64_t getElementOffsetInBits(unsigned Idx) const {
- return getElementOffset(Idx)*8;
+ return getElementOffset(Idx) * 8;
}
private:
- friend class DataLayout; // Only DataLayout can create this class
- StructLayout(StructType *ST, const DataLayout &TD);
+ friend class DataLayout; // Only DataLayout can create this class
+ StructLayout(StructType *ST, const DataLayout &DL);
};
+// The implementation of this method is provided inline as it is particularly
+// well suited to constant folding when called on a specific Type subclass.
+inline uint64_t DataLayout::getTypeSizeInBits(Type *Ty) const {
+ assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
+ switch (Ty->getTypeID()) {
+ case Type::LabelTyID:
+ return getPointerSizeInBits(0);
+ case Type::PointerTyID:
+ return getPointerSizeInBits(Ty->getPointerAddressSpace());
+ case Type::ArrayTyID: {
+ ArrayType *ATy = cast<ArrayType>(Ty);
+ return ATy->getNumElements() *
+ getTypeAllocSizeInBits(ATy->getElementType());
+ }
+ case Type::StructTyID:
+ // Get the layout annotation... which is lazily created on demand.
+ return getStructLayout(cast<StructType>(Ty))->getSizeInBits();
+ case Type::IntegerTyID:
+ return Ty->getIntegerBitWidth();
+ case Type::HalfTyID:
+ return 16;
+ case Type::FloatTyID:
+ return 32;
+ case Type::DoubleTyID:
+ case Type::X86_MMXTyID:
+ return 64;
+ case Type::PPC_FP128TyID:
+ case Type::FP128TyID:
+ return 128;
+ // In memory objects this is always aligned to a higher boundary, but
+ // only 80 bits contain information.
+ case Type::X86_FP80TyID:
+ return 80;
+ case Type::VectorTyID: {
+ VectorType *VTy = cast<VectorType>(Ty);
+ return VTy->getNumElements() * getTypeSizeInBits(VTy->getElementType());
+ }
+ default:
+ llvm_unreachable("DataLayout::getTypeSizeInBits(): Unsupported type");
+ }
+}
+
} // End llvm namespace
#endif
projects / oota-llvm.git / blobdiff