//
// 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/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/System/Mutex.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringExtras.h"
#include <algorithm>
#include <cstdlib>
-#include <sstream>
using namespace llvm;
// Handle the Pass registration stuff necessary to use TargetData's.
-namespace {
- // Register the default SparcV9 implementation...
- RegisterPass<TargetData> X("targetdata", "Target Data Layout");
-}
+
+// Register the default SparcV9 implementation...
+static RegisterPass<TargetData> X("targetdata", "Target Data Layout", false,
+ true);
char TargetData::ID = 0;
//===----------------------------------------------------------------------===//
StructSize = 0;
NumElements = ST->getNumElements();
- // Loop over each of the elements, placing them in memory...
+ // Loop over each of the elements, placing them in memory.
for (unsigned i = 0, e = NumElements; i != e; ++i) {
const Type *Ty = ST->getElementType(i);
- unsigned TyAlign;
- uint64_t TySize;
- TyAlign = (ST->isPacked() ? 1 : TD.getABITypeAlignment(Ty));
- TySize = TD.getTypeSize(Ty);
+ unsigned TyAlign = ST->isPacked() ? 1 : TD.getABITypeAlignment(Ty);
- // Add padding if necessary to make the data element aligned properly...
- if (StructSize % TyAlign != 0)
- StructSize = (StructSize/TyAlign + 1) * TyAlign; // Add padding...
+ // Add padding if necessary to align the data element properly.
+ if ((StructSize & (TyAlign-1)) != 0)
+ StructSize = TargetData::RoundUpAlignment(StructSize, TyAlign);
- // Keep track of maximum alignment constraint
+ // Keep track of maximum alignment constraint.
StructAlignment = std::max(TyAlign, StructAlignment);
MemberOffsets[i] = StructSize;
- StructSize += TySize; // Consume space for this data item
+ StructSize += TD.getTypeAllocSize(Ty); // Consume space for this data item
}
// Empty structures have alignment of 1 byte.
// Add padding to the end of the struct so that it could be put in an array
// and all array elements would be aligned correctly.
- if (StructSize % StructAlignment != 0)
- StructSize = (StructSize/StructAlignment + 1) * StructAlignment;
+ if ((StructSize & (StructAlignment-1)) != 0)
+ StructSize = TargetData::RoundUpAlignment(StructSize, StructAlignment);
}
assert(SI != &MemberOffsets[0] && "Offset not in structure type!");
--SI;
assert(*SI <= Offset && "upper_bound didn't work");
- assert((SI == &MemberOffsets[0] || *(SI-1) < Offset) &&
+ assert((SI == &MemberOffsets[0] || *(SI-1) <= Offset) &&
(SI+1 == &MemberOffsets[NumElements] || *(SI+1) > Offset) &&
"Upper bound didn't work!");
+
+ // Multiple fields can have the same offset if any of them are zero sized.
+ // For example, in { i32, [0 x i32], i32 }, searching for offset 4 will stop
+ // at the i32 element, because it is the last element at that offset. This is
+ // the right one to return, because anything after it will have a higher
+ // offset, implying that this element is non-empty.
return SI-&MemberOffsets[0];
}
TargetAlignElem
TargetAlignElem::get(AlignTypeEnum align_type, unsigned char abi_align,
unsigned char pref_align, uint32_t bit_width) {
+ assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
TargetAlignElem retval;
retval.AlignType = align_type;
retval.ABIAlign = abi_align;
<i>p:@verbatim<size>:<abi_align>:<pref_align>@endverbatim</i>: Pointer size,
ABI and preferred alignment.
<br><br>
- <i>@verbatim<type><size>:<abi_align>:<pref_align>@endverbatim</i>: Numeric type alignment. Type is
- one of <i>i|f|v|a</i>, corresponding to integer, floating point, vector (aka
- packed) or aggregate. Size indicates the size, e.g., 32 or 64 bits.
+ <i>@verbatim<type><size>:<abi_align>:<pref_align>@endverbatim</i>: Numeric type
+ alignment. Type is
+ one of <i>i|f|v|a</i>, corresponding to integer, floating point, vector, or
+ aggregate. Size indicates the size, e.g., 32 or 64 bits.
\p
- The default string, fully specified is:
+ The default string, fully specified, is:
<br><br>
- "E-p:64:64:64-a0:0:0-f32:32:32-f64:0:64"
- "-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:0:64"
+ "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64"
+ "-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64"
"-v64:64:64-v128:128:128"
<br><br>
Note that in the case of aggregates, 0 is the default ABI and preferred
void TargetData::init(const std::string &TargetDescription) {
std::string temp = TargetDescription;
+ LayoutMap = 0;
LittleEndian = false;
PointerMemSize = 8;
PointerABIAlign = 8;
PointerPrefAlign = PointerABIAlign;
// Default alignments
- setAlignment(INTEGER_ALIGN, 1, 1, 1); // Bool
- setAlignment(INTEGER_ALIGN, 1, 1, 8); // Byte
- setAlignment(INTEGER_ALIGN, 2, 2, 16); // short
- setAlignment(INTEGER_ALIGN, 4, 4, 32); // int
- setAlignment(INTEGER_ALIGN, 4, 8, 64); // long
+ setAlignment(INTEGER_ALIGN, 1, 1, 1); // i1
+ setAlignment(INTEGER_ALIGN, 1, 1, 8); // i8
+ setAlignment(INTEGER_ALIGN, 2, 2, 16); // i16
+ setAlignment(INTEGER_ALIGN, 4, 4, 32); // i32
+ setAlignment(INTEGER_ALIGN, 4, 8, 64); // i64
setAlignment(FLOAT_ALIGN, 4, 4, 32); // float
setAlignment(FLOAT_ALIGN, 8, 8, 64); // double
- setAlignment(VECTOR_ALIGN, 8, 8, 64); // v2i32
+ setAlignment(VECTOR_ALIGN, 8, 8, 64); // v2i32, v1i64, ...
setAlignment(VECTOR_ALIGN, 16, 16, 128); // v16i8, v8i16, v4i32, ...
- setAlignment(AGGREGATE_ALIGN, 0, 8, 0); // struct, union, class, ...
+ setAlignment(AGGREGATE_ALIGN, 0, 8, 0); // struct
while (!temp.empty()) {
std::string token = getToken(temp, "-");
case 'f':
case 'a':
case 's': {
- AlignTypeEnum align_type;
+ AlignTypeEnum align_type = STACK_ALIGN; // Dummy init, silence warning
switch(*p) {
case 'i': align_type = INTEGER_ALIGN; break;
case 'v': align_type = VECTOR_ALIGN; break;
}
TargetData::TargetData(const Module *M)
- : ImmutablePass((intptr_t)&ID) {
+ : ImmutablePass(&ID) {
init(M->getDataLayout());
}
void
TargetData::setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
unsigned char pref_align, uint32_t bit_width) {
+ assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
for (unsigned i = 0, e = Alignments.size(); i != e; ++i) {
if (Alignments[i].AlignType == align_type &&
Alignments[i].TypeBitWidth == bit_width) {
/// getAlignmentInfo - Return the alignment (either ABI if ABIInfo = true or
/// preferred if ABIInfo = false) the target wants for the specified datatype.
unsigned TargetData::getAlignmentInfo(AlignTypeEnum AlignType,
- uint32_t BitWidth, bool ABIInfo) const {
+ uint32_t BitWidth, bool ABIInfo,
+ const Type *Ty) const {
// Check to see if we have an exact match and remember the best match we see.
int BestMatchIdx = -1;
int LargestInt = -1;
return ABIInfo ? Alignments[i].ABIAlign : Alignments[i].PrefAlign;
// The best match so far depends on what we're looking for.
- if (AlignType == VECTOR_ALIGN) {
+ if (AlignType == VECTOR_ALIGN && Alignments[i].AlignType == VECTOR_ALIGN) {
// If this is a specification for a smaller vector type, we will fall back
// to it. This happens because <128 x double> can be implemented in terms
// of 64 <2 x double>.
- if (Alignments[i].AlignType == VECTOR_ALIGN &&
- Alignments[i].TypeBitWidth < BitWidth) {
+ if (Alignments[i].TypeBitWidth < BitWidth) {
// Verify that we pick the biggest of the fallbacks.
if (BestMatchIdx == -1 ||
- Alignments[BestMatchIdx].TypeBitWidth < BitWidth)
+ Alignments[BestMatchIdx].TypeBitWidth < Alignments[i].TypeBitWidth)
BestMatchIdx = i;
}
} else if (AlignType == INTEGER_ALIGN &&
}
}
- // For integers, if we didn't find a best match, use the largest one found.
- if (BestMatchIdx == -1)
- BestMatchIdx = LargestInt;
-
// Okay, we didn't find an exact solution. Fall back here depending on what
// is being looked for.
- assert(BestMatchIdx != -1 && "Didn't find alignment info for this datatype!");
+ if (BestMatchIdx == -1) {
+ // If we didn't find an integer alignment, fall back on most conservative.
+ if (AlignType == INTEGER_ALIGN) {
+ BestMatchIdx = LargestInt;
+ } else {
+ assert(AlignType == VECTOR_ALIGN && "Unknown alignment type!");
+
+ // If we didn't find a vector size that is smaller or equal to this type,
+ // then we will end up scalarizing this to its element type. Just return
+ // the alignment of the element.
+ return getAlignment(cast<VectorType>(Ty)->getElementType(), ABIInfo);
+ }
+ }
// Since we got a "best match" index, just return it.
return ABIInfo ? Alignments[BestMatchIdx].ABIAlign
: Alignments[BestMatchIdx].PrefAlign;
}
-/// LayoutInfo - The lazy cache of structure layout information maintained by
-/// TargetData. Note that the struct types must have been free'd before
-/// llvm_shutdown is called (and thus this is deallocated) because all the
-/// targets with cached elements should have been destroyed.
-///
-typedef std::pair<const TargetData*,const StructType*> LayoutKey;
-
-struct DenseMapLayoutKeyInfo {
- static inline LayoutKey getEmptyKey() { return LayoutKey(0, 0); }
- static inline LayoutKey getTombstoneKey() {
- return LayoutKey((TargetData*)(intptr_t)-1, 0);
- }
- static unsigned getHashValue(const LayoutKey &Val) {
- return DenseMapInfo<void*>::getHashValue(Val.first) ^
- DenseMapInfo<void*>::getHashValue(Val.second);
- }
- static bool isEqual(const LayoutKey &LHS, const LayoutKey &RHS) {
- return LHS == RHS;
- }
-
- static bool isPod() { return true; }
-};
-
-typedef DenseMap<LayoutKey, StructLayout*, DenseMapLayoutKeyInfo> LayoutInfoTy;
-static ManagedStatic<LayoutInfoTy> LayoutInfo;
-
+typedef DenseMap<const StructType*, StructLayout*>LayoutInfoTy;
TargetData::~TargetData() {
- if (LayoutInfo.isConstructed()) {
- // Remove any layouts for this TD.
- LayoutInfoTy &TheMap = *LayoutInfo;
- for (LayoutInfoTy::iterator I = TheMap.begin(), E = TheMap.end();
- I != E; ) {
- if (I->first.first == this) {
- I->second->~StructLayout();
- free(I->second);
- TheMap.erase(I++);
- } else {
- ++I;
- }
- }
+ if (!LayoutMap)
+ return;
+
+ // Remove any layouts for this TD.
+ LayoutInfoTy &TheMap = *static_cast<LayoutInfoTy*>(LayoutMap);
+ for (LayoutInfoTy::iterator I = TheMap.begin(), E = TheMap.end(); I != E; ) {
+ I->second->~StructLayout();
+ free(I->second);
+ TheMap.erase(I++);
}
+
+ delete static_cast<LayoutInfoTy*>(LayoutMap);
}
const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
- LayoutInfoTy &TheMap = *LayoutInfo;
+ if (!LayoutMap)
+ LayoutMap = static_cast<void*>(new LayoutInfoTy());
- StructLayout *&SL = TheMap[LayoutKey(this, Ty)];
+ LayoutInfoTy &TheMap = *static_cast<LayoutInfoTy*>(LayoutMap);
+
+ StructLayout *&SL = TheMap[Ty];
if (SL) return SL;
// Otherwise, create the struct layout. Because it is variable length, we
/// removed, this method must be called whenever a StructType is removed to
/// avoid a dangling pointer in this cache.
void TargetData::InvalidateStructLayoutInfo(const StructType *Ty) const {
- if (!LayoutInfo.isConstructed()) return; // No cache.
+ if (!LayoutMap) return; // No cache.
- LayoutInfoTy::iterator I = LayoutInfo->find(LayoutKey(this, Ty));
- if (I != LayoutInfo->end()) {
- I->second->~StructLayout();
- free(I->second);
- LayoutInfo->erase(I);
- }
+ LayoutInfoTy* LayoutInfo = static_cast<LayoutInfoTy*>(LayoutMap);
+ LayoutInfoTy::iterator I = LayoutInfo->find(Ty);
+ if (I == LayoutInfo->end()) return;
+
+ I->second->~StructLayout();
+ free(I->second);
+ LayoutInfo->erase(I);
}
}
-uint64_t TargetData::getTypeSize(const Type *Ty) const {
+uint64_t TargetData::getTypeSizeInBits(const Type *Ty) const {
assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
switch (Ty->getTypeID()) {
case Type::LabelTyID:
case Type::PointerTyID:
- return getPointerSize();
+ return getPointerSizeInBits();
case Type::ArrayTyID: {
const ArrayType *ATy = cast<ArrayType>(Ty);
- uint64_t Size;
- unsigned char Alignment;
- Size = getTypeSize(ATy->getElementType());
- Alignment = getABITypeAlignment(ATy->getElementType());
- uint64_t AlignedSize = (Size + Alignment - 1)/Alignment*Alignment;
- return AlignedSize*ATy->getNumElements();
+ return getTypeAllocSizeInBits(ATy->getElementType())*ATy->getNumElements();
}
- case Type::StructTyID: {
+ case Type::StructTyID:
// Get the layout annotation... which is lazily created on demand.
- const StructLayout *Layout = getStructLayout(cast<StructType>(Ty));
- return Layout->getSizeInBytes();
- }
- case Type::IntegerTyID: {
- unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
- if (BitWidth <= 8) {
- return 1;
- } else if (BitWidth <= 16) {
- return 2;
- } else if (BitWidth <= 32) {
- return 4;
- } else if (BitWidth <= 64) {
- return 8;
- } else {
- // The size of this > 64 bit type is chosen as a multiple of the
- // preferred alignment of the largest "native" size the target supports.
- // We first obtain the the alignment info for this type and then compute
- // the next largest multiple of that size.
- uint64_t size = getAlignmentInfo(INTEGER_ALIGN, BitWidth, false) * 8;
- return (((BitWidth / (size)) + (BitWidth % size != 0)) * size) / 8;
- }
- break;
- }
+ return getStructLayout(cast<StructType>(Ty))->getSizeInBits();
+ case Type::IntegerTyID:
+ return cast<IntegerType>(Ty)->getBitWidth();
case Type::VoidTyID:
- return 1;
+ return 8;
case Type::FloatTyID:
- return 4;
+ return 32;
case Type::DoubleTyID:
- return 8;
+ return 64;
case Type::PPC_FP128TyID:
case Type::FP128TyID:
- return 16;
+ return 128;
// In memory objects this is always aligned to a higher boundary, but
- // only 10 bytes contain information.
+ // only 80 bits contain information.
case Type::X86_FP80TyID:
- return 10;
- case Type::VectorTyID: {
- const VectorType *PTy = cast<VectorType>(Ty);
- return PTy->getBitWidth() / 8;
- }
+ return 80;
+ case Type::VectorTyID:
+ return cast<VectorType>(Ty)->getBitWidth();
default:
- assert(0 && "TargetData::getTypeSize(): Unsupported type");
+ llvm_unreachable("TargetData::getTypeSizeInBits(): Unsupported type");
break;
}
return 0;
}
-uint64_t TargetData::getTypeSizeInBits(const Type *Ty) const {
- if (Ty->isInteger())
- return cast<IntegerType>(Ty)->getBitWidth();
- else
- return getTypeSize(Ty) * 8;
-}
-
-uint64_t TargetData::getABITypeSizeInBits(const Type *Ty) const {
- if (Ty->isInteger())
- return cast<IntegerType>(Ty)->getBitWidth();
- else
- return getABITypeSize(Ty) * 8;
-}
/*!
\param abi_or_pref Flag that determines which alignment is returned. true
returns the ABI alignment, false returns the preferred alignment.
assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
switch (Ty->getTypeID()) {
- /* Early escape for the non-numeric types */
+ // Early escape for the non-numeric types.
case Type::LabelTyID:
case Type::PointerTyID:
return (abi_or_pref
: getPointerPrefAlignment());
case Type::ArrayTyID:
return getAlignment(cast<ArrayType>(Ty)->getElementType(), abi_or_pref);
-
+
case Type::StructTyID: {
// Packed structure types always have an ABI alignment of one.
if (cast<StructType>(Ty)->isPacked() && abi_or_pref)
return 1;
-
+
// Get the layout annotation... which is lazily created on demand.
const StructLayout *Layout = getStructLayout(cast<StructType>(Ty));
- unsigned Align = getAlignmentInfo(AGGREGATE_ALIGN, 0, abi_or_pref);
+ unsigned Align = getAlignmentInfo(AGGREGATE_ALIGN, 0, abi_or_pref, Ty);
return std::max(Align, (unsigned)Layout->getAlignment());
}
case Type::IntegerTyID:
case Type::X86_FP80TyID:
AlignType = FLOAT_ALIGN;
break;
- case Type::VectorTyID: {
- const VectorType *VTy = cast<VectorType>(Ty);
- // Degenerate vectors are assumed to be scalar-ized
- if (VTy->getNumElements() == 1)
- return getAlignment(VTy->getElementType(), abi_or_pref);
- else
- AlignType = VECTOR_ALIGN;
+ case Type::VectorTyID:
+ AlignType = VECTOR_ALIGN;
break;
- }
default:
- assert(0 && "Bad type for getAlignment!!!");
+ llvm_unreachable("Bad type for getAlignment!!!");
break;
}
- return getAlignmentInfo((AlignTypeEnum)AlignType, getTypeSize(Ty) * 8,
- abi_or_pref);
+ return getAlignmentInfo((AlignTypeEnum)AlignType, getTypeSizeInBits(Ty),
+ abi_or_pref, Ty);
}
unsigned char TargetData::getABITypeAlignment(const Type *Ty) const {
/// getIntPtrType - Return an unsigned integer type that is the same size or
/// greater to the host pointer size.
-const Type *TargetData::getIntPtrType() const {
- return IntegerType::get(getPointerSizeInBits());
+const IntegerType *TargetData::getIntPtrType(LLVMContext &C) const {
+ return IntegerType::get(C, getPointerSizeInBits());
}
TI = gep_type_begin(ptrTy, Indices, Indices+NumIndices);
for (unsigned CurIDX = 0; CurIDX != NumIndices; ++CurIDX, ++TI) {
if (const StructType *STy = dyn_cast<StructType>(*TI)) {
- assert(Indices[CurIDX]->getType() == Type::Int32Ty &&
+ assert(Indices[CurIDX]->getType() ==
+ Type::getInt32Ty(ptrTy->getContext()) &&
"Illegal struct idx");
unsigned FieldNo = cast<ConstantInt>(Indices[CurIDX])->getZExtValue();
// Get the array index and the size of each array element.
int64_t arrayIdx = cast<ConstantInt>(Indices[CurIDX])->getSExtValue();
- Result += arrayIdx * (int64_t)getTypeSize(Ty);
+ Result += arrayIdx * (int64_t)getTypeAllocSize(Ty);
}
}
return Result;
}
-/// 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 TargetData::getPreferredAlignmentLog(const GlobalVariable *GV) const {
+/// getPreferredAlignment - Return the preferred alignment of the specified
+/// global. This includes an explicitly requested alignment (if the global
+/// has one).
+unsigned TargetData::getPreferredAlignment(const GlobalVariable *GV) const {
const Type *ElemType = GV->getType()->getElementType();
- unsigned Alignment = getPreferredTypeAlignmentShift(ElemType);
- if (GV->getAlignment() > (1U << Alignment))
- Alignment = Log2_32(GV->getAlignment());
-
+ unsigned Alignment = getPrefTypeAlignment(ElemType);
+ if (GV->getAlignment() > Alignment)
+ Alignment = GV->getAlignment();
+
if (GV->hasInitializer()) {
- if (Alignment < 4) {
+ if (Alignment < 16) {
// If the global is not external, see if it is large. If so, give it a
// larger alignment.
- if (getTypeSize(ElemType) > 128)
- Alignment = 4; // 16-byte alignment.
+ if (getTypeSizeInBits(ElemType) > 128)
+ Alignment = 16; // 16-byte alignment.
}
}
return Alignment;
}
+
+/// 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 TargetData::getPreferredAlignmentLog(const GlobalVariable *GV) const {
+ return Log2_32(getPreferredAlignment(GV));
+}