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//===-- llvm/DerivedTypes.h - Classes for handling data types ----*- C++ -*--=//
//
// This file contains the declarations of classes that represent "derived
// types". These are things like "arrays of x" or "structure of x, y, z" or
// "method returning x taking (y,z) as parameters", etc...
//
// The implementations of these classes live in the Type.cpp file.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DERIVED_TYPES_H
#define LLVM_DERIVED_TYPES_H
#include "llvm/Type.h"
#include "llvm/CodeGen/TargetMachine.h"
#include <vector>
// Future derived types: SIMD packed format
class MethodType : public Type {
public:
typedef vector<const Type*> ParamTypes;
private:
const Type *ResultType;
ParamTypes ParamTys;
MethodType(const MethodType &); // Do not implement
const MethodType &operator=(const MethodType &); // Do not implement
protected:
// This should really be private, but it squelches a bogus warning
// from GCC to make them protected: warning: `class MethodType' only
// defines private constructors and has no friends
// Private ctor - Only can be created by a static member...
MethodType(const Type *Result, const vector<const Type*> &Params,
const string &Name);
public:
inline const Type *getReturnType() const { return ResultType; }
inline const ParamTypes &getParamTypes() const { return ParamTys; }
static const MethodType *getMethodType(const Type *Result,
const ParamTypes &Params);
static const MethodType *get(const Type *Result, const ParamTypes &Params) {
return getMethodType(Result, Params);
}
};
class ArrayType : public Type {
private:
const Type *ElementType;
int NumElements; // >= 0 for sized array, -1 for unbounded/unknown array
ArrayType(const ArrayType &); // Do not implement
const ArrayType &operator=(const ArrayType &); // Do not implement
protected:
// This should really be private, but it squelches a bogus warning
// from GCC to make them protected: warning: `class ArrayType' only
// defines private constructors and has no friends
// Private ctor - Only can be created by a static member...
ArrayType(const Type *ElType, int NumEl, const string &Name);
public:
inline const Type *getElementType() const { return ElementType; }
inline int getNumElements() const { return NumElements; }
inline bool isSized() const { return NumElements >= 0; }
inline bool isUnsized() const { return NumElements == -1; }
static const ArrayType *getArrayType(const Type *ElementType,
int NumElements = -1);
static const ArrayType *get(const Type *ElementType, int NumElements = -1) {
return getArrayType(ElementType, NumElements);
}
};
class StructType : public Type {
public:
typedef vector<const Type*> ElementTypes;
private:
ElementTypes ETypes;
struct StructSizeAndOffsetInfo {
int storageSize; // -1 until the value is computd
vector<int> memberOffsets; // -1 until values are computed
const TargetMachine* targetInfo;
}
*layoutCache;
private:
StructType(const StructType &); // Do not implement
const StructType &operator=(const StructType &); // Do not implement
protected:
// This should really be private, but it squelches a bogus warning
// from GCC to make them protected: warning: `class StructType' only
// defines private constructors and has no friends
// Private ctor - Only can be created by a static member...
StructType(const vector<const Type*> &Types, const string &Name);
// Reset cached info so it will be computed when first requested
void ResetCachedInfo() const;
public:
inline const ElementTypes &getElementTypes() const { return ETypes; }
static const StructType *getStructType(const ElementTypes &Params);
static const StructType *get(const ElementTypes &Params) {
return getStructType(Params);
}
unsigned int getStorageSize(const TargetMachine& tmi) const;
unsigned int getElementOffset(int i, const TargetMachine& tmi) const;
};
inline unsigned int
StructType::getStorageSize(const TargetMachine& tmi) const
{
if (layoutCache->targetInfo != NULL && ! (* layoutCache->targetInfo == tmi))
{// target machine has changed (hey it could happen). discard cached info.
ResetCachedInfo();
layoutCache->targetInfo = &tmi;
}
if (layoutCache->storageSize < 0)
{
layoutCache->storageSize = tmi.findOptimalStorageSize(this);
assert(layoutCache->storageSize >= 0);
}
return layoutCache->storageSize;
}
inline unsigned int
StructType::getElementOffset(int i, const TargetMachine& tmi) const
{
if (layoutCache->targetInfo != NULL && ! (* layoutCache->targetInfo == tmi))
{// target machine has changed (hey it could happen). discard cached info.
ResetCachedInfo();
}
if (layoutCache->memberOffsets[i] < 0)
{
layoutCache->targetInfo = &tmi; // remember which target was used
unsigned int* offsetVec = tmi.findOptimalMemberOffsets(this);
for (unsigned i=0, N=layoutCache->memberOffsets.size(); i < N; i++)
{
layoutCache->memberOffsets[i] = offsetVec[i];
assert(layoutCache->memberOffsets[i] >= 0);
}
delete[] offsetVec;
}
return layoutCache->memberOffsets[i];
}
inline void
StructType::ResetCachedInfo() const
{
layoutCache->storageSize = -1;
layoutCache->memberOffsets.insert(layoutCache->memberOffsets.begin(),
ETypes.size(), -1);
layoutCache->targetInfo = NULL;
}
class PointerType : public Type {
private:
const Type *ValueType;
PointerType(const PointerType &); // Do not implement
const PointerType &operator=(const PointerType &); // Do not implement
protected:
// This should really be private, but it squelches a bogus warning
// from GCC to make them protected: warning: `class PointerType' only
// defines private constructors and has no friends
// Private ctor - Only can be created by a static member...
PointerType(const Type *ElType);
public:
inline const Type *getValueType() const { return ValueType; }
static const PointerType *getPointerType(const Type *ElementType);
static const PointerType *get(const Type *ElementType) {
return getPointerType(ElementType);
}
};
#endif
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