//===-- TargetData.cpp - Data size & alignment routines --------------------==//
-//
+//
// 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
#include "llvm/DerivedTypes.h"
#include "llvm/Constants.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
+#include "llvm/Support/MathExtras.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.
}
static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
- uint64_t &Size, unsigned char &Alignment);
+ uint64_t &Size, unsigned char &Alignment);
//===----------------------------------------------------------------------===//
// Support for StructLayout
StructSize = 0;
// Loop over each of the elements, placing them in memory...
- for (StructType::element_iterator TI = ST->element_begin(),
- TE = ST->element_end(); TI != TE; ++TI) {
+ for (StructType::element_iterator TI = ST->element_begin(),
+ TE = ST->element_end(); TI != TE; ++TI) {
const Type *Ty = *TI;
unsigned char A;
unsigned TyAlign;
StructSize = (StructSize/StructAlignment + 1) * StructAlignment;
}
+
+/// getElementContainingOffset - Given a valid offset into the structure,
+/// return the structure index that contains it.
+unsigned StructLayout::getElementContainingOffset(uint64_t Offset) const {
+ std::vector<uint64_t>::const_iterator SI =
+ std::upper_bound(MemberOffsets.begin(), MemberOffsets.end(),
+ Offset);
+ assert(SI != MemberOffsets.begin() && "Offset not in structure type!");
+ --SI;
+ assert(*SI <= Offset && "upper_bound didn't work");
+ assert((SI == MemberOffsets.begin() || *(SI-1) < Offset) &&
+ (SI+1 == MemberOffsets.end() || *(SI+1) > Offset) &&
+ "Upper bound didn't work!");
+ return SI-MemberOffsets.begin();
+}
+
//===----------------------------------------------------------------------===//
// TargetData Class Implementation
//===----------------------------------------------------------------------===//
-TargetData::TargetData(const std::string &TargetName,
- bool isLittleEndian, unsigned char PtrSize,
- unsigned char PtrAl, unsigned char DoubleAl,
- unsigned char FloatAl, unsigned char LongAl,
- unsigned char IntAl, unsigned char ShortAl,
- unsigned char ByteAl) {
-
- // If this assert triggers, a pass "required" TargetData information, but the
- // top level tool did not provide one for it. We do not want to default
- // construct, or else we might end up using a bad endianness or pointer size!
- //
- assert(!TargetName.empty() &&
- "ERROR: Tool did not specify a target data to use!");
-
- LittleEndian = isLittleEndian;
- PointerSize = PtrSize;
- PointerAlignment = PtrAl;
- DoubleAlignment = DoubleAl;
- assert(DoubleAlignment == PtrAl &&
- "Double alignment and pointer alignment agree for now!");
- FloatAlignment = FloatAl;
- LongAlignment = LongAl;
- IntAlignment = IntAl;
- ShortAlignment = ShortAl;
- ByteAlignment = ByteAl;
-}
-
-TargetData::TargetData(const std::string &ToolName, const Module *M) {
+void TargetData::init(const std::string &TargetDescription) {
+ std::string temp = TargetDescription;
+
+ LittleEndian = false;
+ PointerSize = 8;
+ PointerAlignment = 8;
+ DoubleAlignment = 8;
+ FloatAlignment = 4;
+ LongAlignment = 8;
+ IntAlignment = 4;
+ ShortAlignment = 2;
+ ByteAlignment = 1;
+ BoolAlignment = 1;
+
+ while (!temp.empty()) {
+ std::string token = getToken(temp, "-");
+
+ char signal = getToken(token, ":")[0];
+
+ switch(signal) {
+ case 'E':
+ LittleEndian = false;
+ break;
+ case 'e':
+ LittleEndian = true;
+ break;
+ case 'p':
+ PointerSize = atoi(getToken(token,":").c_str()) / 8;
+ PointerAlignment = atoi(getToken(token,":").c_str()) / 8;
+ break;
+ case 'd':
+ DoubleAlignment = atoi(getToken(token,":").c_str()) / 8;
+ break;
+ case 'f':
+ FloatAlignment = atoi(getToken(token, ":").c_str()) / 8;
+ break;
+ case 'l':
+ LongAlignment = atoi(getToken(token, ":").c_str()) / 8;
+ break;
+ case 'i':
+ IntAlignment = atoi(getToken(token, ":").c_str()) / 8;
+ break;
+ case 's':
+ ShortAlignment = atoi(getToken(token, ":").c_str()) / 8;
+ break;
+ case 'b':
+ ByteAlignment = atoi(getToken(token, ":").c_str()) / 8;
+ break;
+ case 'B':
+ BoolAlignment = atoi(getToken(token, ":").c_str()) / 8;
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+TargetData::TargetData(const Module *M) {
LittleEndian = M->getEndianness() != Module::BigEndian;
PointerSize = M->getPointerSize() != Module::Pointer64 ? 4 : 8;
PointerAlignment = PointerSize;
DoubleAlignment = PointerSize;
FloatAlignment = 4;
- LongAlignment = 8;
+ LongAlignment = PointerSize;
IntAlignment = 4;
ShortAlignment = 2;
ByteAlignment = 1;
+ BoolAlignment = 1;
}
+/// Layouts - The lazy cache of structure layout information maintained by
+/// TargetData.
+///
static std::map<std::pair<const TargetData*,const StructType*>,
StructLayout> *Layouts = 0;
}
}
+std::string TargetData::getStringRepresentation() const {
+ std::stringstream repr;
+
+ if (LittleEndian)
+ repr << "e";
+ else
+ repr << "E";
+
+ repr << "-p:" << (PointerSize * 8) << ":" << (PointerAlignment * 8);
+ repr << "-d:64:" << (DoubleAlignment * 8);
+ repr << "-f:32:" << (FloatAlignment * 8);
+ repr << "-l:64:" << (LongAlignment * 8);
+ repr << "-i:32:" << (IntAlignment * 8);
+ repr << "-s:16:" << (ShortAlignment * 8);
+ repr << "-b:8:" << (ByteAlignment * 8);
+ repr << "-B:8:" << (BoolAlignment * 8);
+
+ return repr.str();
+}
+
const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
if (Layouts == 0)
Layouts = new std::map<std::pair<const TargetData*,const StructType*>,
}
}
+/// 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 TargetData::InvalidateStructLayoutInfo(const StructType *Ty) const {
+ if (!Layouts) return; // No cache.
+
+ std::map<std::pair<const TargetData*,const StructType*>,
+ StructLayout>::iterator I = Layouts->find(std::make_pair(this, Ty));
+ if (I != Layouts->end())
+ Layouts->erase(I);
+}
+
+
+
static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
- uint64_t &Size, unsigned char &Alignment) {
+ uint64_t &Size, unsigned char &Alignment) {
assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
switch (Ty->getTypeID()) {
+ case Type::BoolTyID: Size = 1; Alignment = TD->getBoolAlignment(); return;
case Type::VoidTyID:
- case Type::BoolTyID:
case Type::UByteTyID:
case Type::SByteTyID: Size = 1; Alignment = TD->getByteAlignment(); return;
case Type::UShortTyID:
Size = AlignedSize*ATy->getNumElements();
return;
}
+ case Type::PackedTyID: {
+ const PackedType *PTy = cast<PackedType>(Ty);
+ getTypeInfo(PTy->getElementType(), TD, Size, Alignment);
+ unsigned AlignedSize = (Size + Alignment - 1)/Alignment*Alignment;
+ Size = AlignedSize*PTy->getNumElements();
+ // FIXME: The alignments of specific packed types are target dependent.
+ // For now, just set it to be equal to Size.
+ Alignment = Size;
+ return;
+ }
case Type::StructTyID: {
// Get the layout annotation... which is lazily created on demand.
const StructLayout *Layout = TD->getStructLayout(cast<StructType>(Ty));
Size = Layout->StructSize; Alignment = Layout->StructAlignment;
return;
}
-
+
default:
assert(0 && "Bad type for getTypeInfo!!!");
return;
return Align;
}
+unsigned char TargetData::getTypeAlignmentShift(const Type *Ty) const {
+ unsigned Align = getTypeAlignment(Ty);
+ assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
+ return Log2_32(Align);
+}
+
/// getIntPtrType - Return an unsigned integer type that is the same size or
/// greater to the host pointer size.
const Type *TargetData::getIntPtrType() const {
uint64_t TargetData::getIndexedOffset(const Type *ptrTy,
- const std::vector<Value*> &Idx) const {
+ const std::vector<Value*> &Idx) const {
const Type *Ty = ptrTy;
assert(isa<PointerType>(Ty) && "Illegal argument for getIndexedOffset()");
uint64_t Result = 0;
for (unsigned CurIDX = 0; CurIDX != Idx.size(); ++CurIDX, ++TI) {
if (const StructType *STy = dyn_cast<StructType>(*TI)) {
assert(Idx[CurIDX]->getType() == Type::UIntTy && "Illegal struct idx");
- unsigned FieldNo = cast<ConstantUInt>(Idx[CurIDX])->getValue();
+ unsigned FieldNo = cast<ConstantInt>(Idx[CurIDX])->getZExtValue();
// Get structure layout information...
const StructLayout *Layout = getStructLayout(STy);
Ty = cast<SequentialType>(Ty)->getElementType();
// Get the array index and the size of each array element.
- int64_t arrayIdx = cast<ConstantInt>(Idx[CurIDX])->getRawValue();
+ int64_t arrayIdx = cast<ConstantInt>(Idx[CurIDX])->getSExtValue();
Result += arrayIdx * (int64_t)getTypeSize(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 {
+ const Type *ElemType = GV->getType()->getElementType();
+ unsigned Alignment = getTypeAlignmentShift(ElemType);
+ if (GV->getAlignment() > (1U << Alignment))
+ Alignment = Log2_32(GV->getAlignment());
+
+ if (GV->hasInitializer()) {
+ // Always round up alignment of global doubles to 8 bytes.
+ if (GV->getType()->getElementType() == Type::DoubleTy && Alignment < 3)
+ Alignment = 3;
+ if (Alignment < 4) {
+ // 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.
+ }
+ }
+ return Alignment;
+}
+
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