#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>
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
+ AGGREGATE_ALIGN = 'a' ///< Aggregate alignment
};
/// Layout alignment element.
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 TypeByteWidth; ///< Type byte width
uint32_t AddressSpace; ///< Address space for the pointer type
/// Initializer
- static PointerAlignElem get(uint32_t addr_space, unsigned abi_align,
- unsigned pref_align, uint32_t bit_width);
+ static PointerAlignElem get(uint32_t AddressSpace, unsigned ABIAlign,
+ unsigned PrefAlign, uint32_t TypeByteWidth);
/// Equality predicate
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 {
+/// 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.
+class DataLayout {
private:
bool LittleEndian; ///< Defaults to false
unsigned StackNaturalAlign; ///< Stack natural alignment
+ enum ManglingModeT {
+ MM_None,
+ MM_ELF,
+ MM_MachO,
+ MM_WINCOFF,
+ MM_Mips
+ };
+ ManglingModeT ManglingMode;
+
SmallVector<unsigned char, 8> LegalIntWidths; ///< Legal Integers.
- /// Alignments- Where the primitive type alignment data is stored.
+ /// Alignments - Where the primitive type alignment data is stored.
///
- /// @sa init().
+ /// @sa reset().
/// @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.
SmallVector<LayoutAlignElem, 16> Alignments;
- DenseMap<unsigned, PointerAlignElem> Pointers;
+ 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);
/// InvalidAlignmentElem - This member is a signal that a requested alignment
/// type and bit width were not found in the SmallVector.
bool ABIAlign, Type *Ty) const;
//! Set/initialize pointer alignments
- void setPointerAlignment(uint32_t addr_space, unsigned abi_align,
- unsigned pref_align, uint32_t bit_width);
+ void setPointerAlignment(uint32_t AddrSpace, unsigned ABIAlign,
+ unsigned PrefAlign, uint32_t TypeByteWidth);
//! Internal helper method that returns requested alignment for type.
unsigned getAlignment(Type *Ty, bool abi_or_pref) const;
/// 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(const DataLayout &DL) : LayoutMap(nullptr) { *this = DL; }
+
+ DataLayout &operator=(const DataLayout &DL) {
+ clear();
+ LittleEndian = DL.isLittleEndian();
+ 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). Ensure that
- /// the data layout pass is registered.
- void init(StringRef LayoutDescription);
+ /// Parse a data layout string (with fallback to default values).
+ void reset(StringRef LayoutDescription);
/// Layout endianness...
bool isLittleEndian() const { return LittleEndian; }
/// 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;
}
return (StackNaturalAlign != 0) && (Align > StackNaturalAlign);
}
+ bool hasMicrosoftFastStdCallMangling() const {
+ return ManglingMode == MM_WINCOFF;
+ }
+
+ bool hasLinkerPrivateGlobalPrefix() const {
+ return ManglingMode == MM_MachO;
+ }
+
+ const char *getLinkerPrivateGlobalPrefix() const {
+ if (ManglingMode == MM_MachO)
+ return "l";
+ return getPrivateGlobalPrefix();
+ }
+
+ char getGlobalPrefix() const {
+ switch (ManglingMode) {
+ case MM_None:
+ case MM_ELF:
+ case MM_Mips:
+ return '\0';
+ case MM_MachO:
+ case MM_WINCOFF:
+ 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:
+ return "L";
+ }
+ llvm_unreachable("invalid mangling mode");
+ }
+
+ static const char *getManglingComponent(const Triple &T);
+
/// 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.
+ /// 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[*]
/// 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;
+ 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
/// 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 {
+ uint64_t getTypeAllocSize(Type *Ty) const {
// Round up to the next alignment boundary.
return RoundUpAlignment(getTypeStoreSize(Ty), getABITypeAlignment(Ty));
}
/// 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 {
+ uint64_t getTypeAllocSizeInBits(Type *Ty) const {
return 8*getTypeAllocSize(Ty);
}
/// 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.
unsigned getPrefTypeAlignment(Type *Ty) const;
/// getPreferredTypeAlignmentShift - Return 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
/// type.
Type *getIntPtrType(Type *) const;
+ /// getSmallestLegalIntType - Return the smallest integer type with size at
+ /// least as big as Width bits.
+ Type *getSmallestLegalIntType(LLVMContext &C, unsigned Width = 0) const;
+
+ /// getLargestLegalIntType - Return 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);
+ }
+
+ /// getLargestLegalIntTypeSize - Return the size of largest legal integer
+ /// type size, or 0 if none are set.
+ unsigned getLargestLegalIntTypeSize() const;
+
/// getIndexedOffset - return 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
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);
+}
+
+inline LLVMTargetDataRef wrap(const DataLayout *P) {
+ return reinterpret_cast<LLVMTargetDataRef>(const_cast<DataLayout*>(P));
+}
+
+class DataLayoutPass : public ImmutablePass {
+ DataLayout DL;
+
+public:
+ /// This has to exist, because this is a pass, but it should never be used.
+ DataLayoutPass();
+ ~DataLayoutPass();
+
+ const DataLayout &getDataLayout() const { return DL; }
static char ID; // Pass identification, replacement for typeid
+
+ bool doFinalization(Module &M) override;
+ bool doInitialization(Module &M) override;
};
/// StructLayout - used to lazily calculate structure layout information for a
private:
friend class DataLayout; // Only DataLayout can create this class
- StructLayout(StructType *ST, const DataLayout &TD);
+ 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
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