//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#include "llvm/Pass.h"
#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/ADT/SmallVector.h"
#include <string>
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
- PACKED_ALIGN = 'v', ///< Vector type alignment
+ VECTOR_ALIGN = 'v', ///< Vector type alignment
FLOAT_ALIGN = 'f', ///< Floating point type alignment
- AGGREGATE_ALIGN = 'a' ///< Aggregate 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, packed/vector, float) and type bit width.
+/// 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 {
- unsigned char AlignType; //< Alignment type (AlignTypeEnum)
+ AlignTypeEnum AlignType : 8; //< Alignment type (AlignTypeEnum)
unsigned char ABIAlign; //< ABI alignment for this type/bitw
unsigned char PrefAlign; //< Pref. alignment for this type/bitw
- short TypeBitWidth; //< Type bit width
+ uint32_t TypeBitWidth; //< Type bit width
/// Initializer
static TargetAlignElem get(AlignTypeEnum align_type, unsigned char abi_align,
- unsigned char pref_align, short bit_width);
- /// Less-than predicate
- bool operator<(const TargetAlignElem &rhs) const;
+ 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;
};
-//! TargetAlignElem output stream inserter
-/*!
- @sa TargetAlignElem::dump()
- */
-std::ostream &operator<<(std::ostream &os, const TargetAlignElem &elem);
-
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 global alignment
+ unsigned char PointerPrefAlign; ///< Pointer preferred alignment
//! Where the primitive type alignment data is stored.
/*!
*/
static const TargetAlignElem InvalidAlignmentElem;
+ // Opaque pointer for the StructType -> StructLayout map.
+ mutable void* LayoutMap;
+
//! Set/initialize target alignments
void setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
- unsigned char pref_align, short bit_width);
- //! Get TargetAlignElem from alignment type and bit width
- const TargetAlignElem &getAlignment(AlignTypeEnum, short) const;
+ 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;
///
/// @note This has to exist, because this is a pass, but it should never be
/// used.
- TargetData() {
- assert(0 && "ERROR: Bad TargetData ctor used. "
- "Tool did not specify a TargetData to use?");
- abort();
+ TargetData() : ImmutablePass(&ID) {
+ llvm_report_error("Bad TargetData ctor used. "
+ "Tool did not specify a TargetData to use?");
}
-
+
/// Constructs a TargetData from a specification string. See init().
- TargetData(const std::string &TargetDescription) {
+ explicit TargetData(const std::string &TargetDescription)
+ : ImmutablePass(&ID) {
init(TargetDescription);
}
/// Initialize target data from properties stored in the module.
- TargetData(const Module *M);
+ explicit TargetData(const Module *M);
- TargetData(const TargetData &TD) :
- ImmutablePass(),
+ TargetData(const TargetData &TD) :
+ ImmutablePass(&ID),
LittleEndian(TD.isLittleEndian()),
PointerMemSize(TD.PointerMemSize),
PointerABIAlign(TD.PointerABIAlign),
PointerPrefAlign(TD.PointerPrefAlign),
- Alignments(TD.Alignments)
+ 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(const std::string &TargetDescription);
-
+
/// Target endianness...
bool isLittleEndian() const { return LittleEndian; }
bool isBigEndian() const { return !LittleEndian; }
/// 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;
+ /// 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 bytes necessary to hold the
- /// specified type.
+ /// 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;
- /// getTypeAlignmentABI - Return the minimum ABI-required alignment for the
+ /// 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;
- /// getTypeAlignmentPref - Return the preferred stack/global alignment for
- /// the specified type.
+ /// 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
/// getIntPtrType - Return an unsigned integer type that is the same size or
/// greater to the host pointer size.
///
- const Type *getIntPtrType() const;
+ const IntegerType *getIntPtrType(LLVMContext &C) const;
- /// getIndexOffset - return the offset from the beginning of the type for the
- /// specified indices. This is used to implement getelementptr.
+ /// 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
uint64_t getSizeInBytes() const {
return StructSize;
}
-
+
+ uint64_t getSizeInBits() const {
+ return 8*StructSize;
+ }
+
unsigned getAlignment() const {
return StructAlignment;
}
-
- /// getElementContainingOffset - Given a valid offset into the structure,
+
+ /// getElementContainingOffset - Given a valid byte offset into the structure,
/// return the structure index that contains it.
///
unsigned getElementContainingOffset(uint64_t Offset) 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);
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