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//===- ConstantHandling.cpp - Implement ConstantHandling.h ----------------===//
//
// This file implements the various intrinsic operations, on constant values.
//
//===----------------------------------------------------------------------===//
#include "llvm/Opt/ConstantHandling.h"
//===----------------------------------------------------------------------===//
// TemplateRules Class
//===----------------------------------------------------------------------===//
//
// TemplateRules - Implement a subclass of ConstRules that provides all
// operations as noops. All other rules classes inherit from this class so
// that if functionality is needed in the future, it can simply be added here
// and to ConstRules without changing anything else...
//
// This class also provides subclasses with typesafe implementations of methods
// so that don't have to do type casting.
//
template<class ArgType, class SubClassName>
class TemplateRules : public ConstRules {
//===--------------------------------------------------------------------===//
// Redirecting functions that cast to the appropriate types
//===--------------------------------------------------------------------===//
virtual ConstPoolVal *neg(const ConstPoolVal *V) const {
return SubClassName::Neg((const ArgType *)V);
}
virtual ConstPoolVal *not(const ConstPoolVal *V) const {
return SubClassName::Not((const ArgType *)V);
}
virtual ConstPoolVal *add(const ConstPoolVal *V1,
const ConstPoolVal *V2) const {
return SubClassName::Add((const ArgType *)V1, (const ArgType *)V2);
}
virtual ConstPoolVal *sub(const ConstPoolVal *V1,
const ConstPoolVal *V2) const {
return SubClassName::Sub((const ArgType *)V1, (const ArgType *)V2);
}
virtual ConstPoolBool *lessthan(const ConstPoolVal *V1,
const ConstPoolVal *V2) const {
return SubClassName::LessThan((const ArgType *)V1, (const ArgType *)V2);
}
//===--------------------------------------------------------------------===//
// Default "noop" implementations
//===--------------------------------------------------------------------===//
inline static ConstPoolVal *Neg(const ArgType *V) { return 0; }
inline static ConstPoolVal *Not(const ArgType *V) { return 0; }
inline static ConstPoolVal *Add(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static ConstPoolVal *Sub(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static ConstPoolBool *LessThan(const ArgType *V1, const ArgType *V2) {
return 0;
}
};
//===----------------------------------------------------------------------===//
// EmptyRules Class
//===----------------------------------------------------------------------===//
//
// EmptyRules provides a concrete base class of ConstRules that does nothing
//
static // EmptyInst is static
struct EmptyRules : public TemplateRules<ConstPoolVal, EmptyRules> {
} EmptyInst;
//===----------------------------------------------------------------------===//
// BoolRules Class
//===----------------------------------------------------------------------===//
//
// BoolRules provides a concrete base class of ConstRules for the 'bool' type.
//
static // BoolTyInst is static...
struct BoolRules : public TemplateRules<ConstPoolBool, BoolRules> {
inline static ConstPoolVal *Not(const ConstPoolBool *V) {
return new ConstPoolBool(!V->getValue());
}
inline static ConstPoolVal *Or(const ConstPoolBool *V1,
const ConstPoolBool *V2) {
bool Result = V1->getValue() | V2->getValue();
return new ConstPoolBool(Result);
}
inline static ConstPoolVal *And(const ConstPoolBool *V1,
const ConstPoolBool *V2) {
bool Result = V1->getValue() & V2->getValue();
return new ConstPoolBool(Result);
}
} BoolTyInst;
//===----------------------------------------------------------------------===//
// DirectRules Class
//===----------------------------------------------------------------------===//
//
// DirectRules provides a concrete base classes of ConstRules for a variety of
// different types. This allows the C++ compiler to automatically generate our
// constant handling operations in a typesafe and accurate manner.
//
template<class ConstPoolClass, class BuiltinType, const Type **Ty>
struct DirectRules
: public TemplateRules<ConstPoolClass,
DirectRules<ConstPoolClass, BuiltinType, Ty> > {
inline static ConstPoolVal *Neg(const ConstPoolClass *V) {
return new ConstPoolClass(*Ty, -(BuiltinType)V->getValue());;
}
inline static ConstPoolVal *Not(const ConstPoolClass *V) {
return new ConstPoolClass(*Ty, !(BuiltinType)V->getValue());;
}
inline static ConstPoolVal *Add(const ConstPoolClass *V1,
const ConstPoolClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() +
(BuiltinType)V2->getValue();
return new ConstPoolClass(*Ty, Result);
}
inline static ConstPoolVal *Sub(const ConstPoolClass *V1,
const ConstPoolClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() -
(BuiltinType)V2->getValue();
return new ConstPoolClass(*Ty, Result);
}
inline static ConstPoolBool *LessThan(const ConstPoolClass *V1,
const ConstPoolClass *V2) {
bool Result = (BuiltinType)V1->getValue() < (BuiltinType)V2->getValue();
return new ConstPoolBool(Result);
}
};
//===----------------------------------------------------------------------===//
// DirectRules Subclasses
//===----------------------------------------------------------------------===//
//
// Given the DirectRules class we can now implement lots of types with little
// code. Thank goodness C++ compilers are great at stomping out layers of
// templates... can you imagine having to do this all by hand? (/me is lazy :)
//
static DirectRules<ConstPoolSInt, signed char , &Type::SByteTy> SByteTyInst;
static DirectRules<ConstPoolUInt, unsigned char , &Type::UByteTy> UByteTyInst;
static DirectRules<ConstPoolSInt, signed short, &Type::ShortTy> ShortTyInst;
static DirectRules<ConstPoolUInt, unsigned short, &Type::UShortTy> UShortTyInst;
static DirectRules<ConstPoolSInt, signed int , &Type::IntTy> IntTyInst;
static DirectRules<ConstPoolUInt, unsigned int , &Type::UIntTy> UIntTyInst;
static DirectRules<ConstPoolSInt, int64_t , &Type::LongTy> LongTyInst;
static DirectRules<ConstPoolUInt, uint64_t , &Type::ULongTy> ULongTyInst;
static DirectRules<ConstPoolFP , float , &Type::FloatTy> FloatTyInst;
static DirectRules<ConstPoolFP , double , &Type::DoubleTy> DoubleTyInst;
// ConstRules::find - Return the constant rules that take care of the specified
// type. Note that this is cached in the Type value itself, so switch statement
// is only hit at most once per type.
//
const ConstRules *ConstRules::find(const Type *Ty) {
const ConstRules *Result;
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: Result = &BoolTyInst; break;
case Type::SByteTyID: Result = &SByteTyInst; break;
case Type::UByteTyID: Result = &UByteTyInst; break;
case Type::ShortTyID: Result = &ShortTyInst; break;
case Type::UShortTyID: Result = &UShortTyInst; break;
case Type::IntTyID: Result = &IntTyInst; break;
case Type::UIntTyID: Result = &UIntTyInst; break;
case Type::LongTyID: Result = &LongTyInst; break;
case Type::ULongTyID: Result = &ULongTyInst; break;
case Type::FloatTyID: Result = &FloatTyInst; break;
case Type::DoubleTyID: Result = &DoubleTyInst; break;
default: Result = &EmptyInst; break;
}
Ty->setConstRules(Result); // Cache the value for future short circuiting!
return Result;
}
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