Initial revision
llvm-svn: 2
diff --git a/llvm/lib/VMCore/ConstantHandling.cpp b/llvm/lib/VMCore/ConstantHandling.cpp
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+++ b/llvm/lib/VMCore/ConstantHandling.cpp
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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;
+}