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Initial checkin of TargetData code
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@384 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
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85
include/llvm/CodeGen/TargetData.h
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85
include/llvm/CodeGen/TargetData.h
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//===-- llvm/TargetData.h - Data size & alignment routines -------*- C++ -*-==//
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//
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// This file defines target properties related to datatype size/offset/alignment
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// information. It uses lazy annotations to cache information about how
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// structure types are laid out and used.
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//
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// This structure should be created once, filled in if the defaults are not
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// correct and then passed around by const&. None of the members functions
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// require modification to the object.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_TARGETDATA_H
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#define LLVM_CODEGEN_TARGETDATA_H
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#include "llvm/Type.h"
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#include <vector>
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class StructType;
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class StructLayout;
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class TargetData {
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unsigned char ByteAlignment; // Defaults to 1 bytes
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unsigned char ShortAlignment; // Defaults to 2 bytes
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unsigned char IntAlignment; // Defaults to 4 bytes
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unsigned char LongAlignment; // Defaults to 8 bytes
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unsigned char FloatAlignment; // Defaults to 4 bytes
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unsigned char DoubleAlignment; // Defaults to 8 bytes
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unsigned char PointerSize; // Defaults to 8 bytes
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unsigned char PointerAlignment; // Defaults to 8 bytes
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AnnotationID AID; // AID for structure layout annotation
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static Annotation *TypeAnFactory(AnnotationID, Annotable *, void *);
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public:
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TargetData(const string &TargetName, unsigned char PtrSize = 8,
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unsigned char PtrAl = 8, unsigned char DoubleAl = 8,
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unsigned char FloatAl = 4, unsigned char LongAl = 8,
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unsigned char IntAl = 4, unsigned char ShortAl = 2,
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unsigned char ByteAl = 1);
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~TargetData(); // Not virtual, do not subclass this class
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unsigned char getByteAlignment() const { return ByteAlignment; }
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unsigned char getShortAlignment() const { return ShortAlignment; }
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unsigned char getIntAlignment() const { return IntAlignment; }
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unsigned char getLongAlignment() const { return LongAlignment; }
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unsigned char getFloatAlignment() const { return FloatAlignment; }
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unsigned char getDoubleAlignment() const { return DoubleAlignment; }
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unsigned char getPointerAlignment() const { return PointerAlignment; }
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unsigned char getPointerSize() const { return PointerSize; }
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AnnotationID getStructLayoutAID() const { return AID; }
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// getTypeSize - Return the number of bytes neccesary to hold the specified
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// type
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unsigned getTypeSize (const Type *Ty) const;
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// getTypeAlignment - Return the minimum required alignment for the specified
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// type
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unsigned char getTypeAlignment(const Type *Ty) const;
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// getIndexOffset - return the offset from the beginning of the type for the
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// specified indices. This is used to implement getElementPtr and load and
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// stores that include the implicit form of getelementptr.
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//
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unsigned getIndexedOffset(const Type *Ty,
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const vector<ConstPoolVal*> &Indices) const;
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inline const StructLayout *getStructLayout(const StructType *Ty) const {
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return (const StructLayout*)((Value*)Ty)->getOrCreateAnnotation(AID);
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}
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};
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// This annotation (attached ONLY to StructType classes) is used to lazily
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// calculate structure layout information for a target machine, based on the
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// TargetData structure.
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//
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struct StructLayout : public Annotation {
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vector<unsigned> MemberOffsets;
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unsigned StructSize;
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unsigned StructAlignment;
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private:
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friend class TargetData; // Only TargetData can create this class
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inline StructLayout(const StructType *ST, const TargetData &TD);
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};
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#endif
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181
lib/CodeGen/TargetMachine/TargetData.cpp
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181
lib/CodeGen/TargetMachine/TargetData.cpp
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//===-- TargetData.cpp - Data size & alignment routines --------------------==//
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//
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// This file defines target properties related to datatype size/offset/alignment
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// information. It uses lazy annotations to cache information about how
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// structure types are laid out and used.
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//
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// This structure should be created once, filled in if the defaults are not
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// correct and then passed around by const&. None of the members functions
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// require modification to the object.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/TargetData.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/ConstPoolVals.h"
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static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
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unsigned &Size, unsigned char &Alignment);
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//===----------------------------------------------------------------------===//
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// Support for StructLayout Annotation
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//===----------------------------------------------------------------------===//
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StructLayout::StructLayout(const StructType *ST, const TargetData &TD)
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: Annotation(TD.getStructLayoutAID()) {
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StructAlignment = 0;
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StructSize = 0;
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// Loop over each of the elements, placing them in memory...
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for (StructType::ElementTypes::const_iterator
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TI = ST->getElementTypes().begin(),
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TE = ST->getElementTypes().end(); TI != TE; ++TI) {
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const Type *Ty = *TI;
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unsigned char A;
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unsigned TySize, TyAlign;
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getTypeInfo(Ty, &TD, TySize, A); TyAlign = A;
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// Add padding if neccesary to make the data element aligned properly...
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if (StructSize % TyAlign != 0)
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StructSize = (StructSize/TyAlign + 1) * TyAlign; // Add padding...
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// Keep track of maximum alignment constraint
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StructAlignment = max(TyAlign, StructAlignment);
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MemberOffsets.push_back(StructSize);
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StructSize += TySize; // Consume space for this data item...
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}
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// Add padding to the end of the struct so that it could be put in an array
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// and all array elements would be aligned correctly.
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if (StructSize % StructAlignment != 0)
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StructSize = (StructSize/StructAlignment + 1) * StructAlignment;
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if (StructSize == 0) {
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StructSize = 1; // Empty struct is 1 byte
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StructAlignment = 1;
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}
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}
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Annotation *TargetData::TypeAnFactory(AnnotationID AID, Annotable *T, void *D) {
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const TargetData &TD = *(const TargetData*)D;
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assert(AID == TD.AID && "Target data annotation ID mismatch!");
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const Type *Ty = ((const Value *)T)->castTypeAsserting();
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assert(Ty->isStructType() &&
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"Can only create StructLayout annotation on structs!");
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return new StructLayout((const StructType *)Ty, TD);
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}
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//===----------------------------------------------------------------------===//
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// TargetData Class Implementation
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//===----------------------------------------------------------------------===//
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TargetData::TargetData(const string &TargetName, unsigned char PtrSize = 8,
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unsigned char PtrAl = 8, unsigned char DoubleAl = 8,
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unsigned char FloatAl = 4, unsigned char LongAl = 8,
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unsigned char IntAl = 4, unsigned char ShortAl = 2,
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unsigned char ByteAl = 1)
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: AID(AnnotationManager::getID("TargetData::" + TargetName)) {
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AnnotationManager::registerAnnotationFactory(AID, TypeAnFactory, this);
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PointerSize = PtrSize;
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PointerAlignment = PtrAl;
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DoubleAlignment = DoubleAl;
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FloatAlignment = FloatAl;
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LongAlignment = LongAl;
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IntAlignment = IntAl;
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ShortAlignment = ShortAl;
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ByteAlignment = ByteAl;
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}
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TargetData::~TargetData() {
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AnnotationManager::registerAnnotationFactory(AID, 0); // Deregister factory
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}
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static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
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unsigned &Size, unsigned char &Alignment) {
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switch (Ty->getPrimitiveID()) {
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case Type::VoidTyID:
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case Type::BoolTyID:
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case Type::UByteTyID:
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case Type::SByteTyID: Size = 1; Alignment = TD->getByteAlignment(); return;
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case Type::UShortTyID:
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case Type::ShortTyID: Size = 2; Alignment = TD->getShortAlignment(); return;
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case Type::UIntTyID:
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case Type::IntTyID: Size = 4; Alignment = TD->getIntAlignment(); return;
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case Type::ULongTyID:
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case Type::LongTyID: Size = 8; Alignment = TD->getLongAlignment(); return;
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case Type::FloatTyID: Size = 4; Alignment = TD->getFloatAlignment(); return;
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case Type::DoubleTyID: Size = 8; Alignment = TD->getDoubleAlignment(); return;
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case Type::LabelTyID:
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case Type::PointerTyID:
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Size = TD->getPointerSize(); Alignment = TD->getPointerAlignment();
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return;
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case Type::ArrayTyID: {
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const ArrayType *ATy = (const ArrayType *)Ty;
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assert(ATy->isSized() && "Can't get TypeInfo of an unsized array!");
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getTypeInfo(ATy->getElementType(), TD, Size, Alignment);
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Size *= ATy->getNumElements();
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return;
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}
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case Type::StructTyID: {
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// Get the layout annotation... which is lazily created on demand.
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const StructLayout *Layout = TD->getStructLayout((const StructType*)Ty);
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Size = Layout->StructSize; Alignment = Layout->StructAlignment;
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return;
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}
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case Type::TypeTyID:
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default:
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assert(0 && "Bad type for getTypeInfo!!!");
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return;
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}
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}
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unsigned TargetData::getTypeSize(const Type *Ty) const {
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unsigned Size; unsigned char Align;
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getTypeInfo(Ty, this, Size, Align);
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return Size;
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}
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unsigned char TargetData::getTypeAlignment(const Type *Ty) const {
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unsigned Size; unsigned char Align;
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getTypeInfo(Ty, this, Size, Align);
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return Align;
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}
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unsigned TargetData::getIndexedOffset(const Type *ptrTy,
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const vector<ConstPoolVal*> &Idx) const {
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const PointerType *PtrTy = PtrTy->isPointerType(); // Returns null if not
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assert(PtrTy && "getIndexedOffset on nonpointer!");
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unsigned Result = 0;
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// Get the type pointed to...
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const Type *Ty = PtrTy->getValueType();
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for (unsigned CurIDX = 0; CurIDX < Idx.size(); ++CurIDX) {
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if (const StructType *STy = Ty->isStructType()) {
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assert(Idx[CurIDX]->getType() == Type::UByteTy && "Illegal struct idx");
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unsigned FieldNo = ((ConstPoolUInt*)Idx[CurIDX++])->getValue();
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// Get structure layout information...
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const StructLayout *Layout = getStructLayout(STy);
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// Add in the offset, as calculated by the structure layout info...
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assert(FieldNo < Layout->MemberOffsets.size() && "FieldNo out of range!");
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Result += Layout->MemberOffsets[FieldNo];
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// Update Ty to refer to current element
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Ty = STy->getElementTypes()[FieldNo];
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} else if (const ArrayType *ATy = Ty->isArrayType()) {
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assert(0 && "Loading from arrays not implemented yet!");
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} else {
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assert(0 && "Indexing type that is not struct or array?");
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return 0; // Load directly through ptr
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}
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}
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return Result;
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}
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