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For PR950:
Add a new feature to FunctionType, Parameter Attributes. This allows tags such as "sext" and "zext" to be associated with a faunction's arguments or return type. This allows signedness information to be carried forward from the frontend to the backend for arguments and result types. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32776 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -75,21 +75,40 @@ public:
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/// FunctionType - Class to represent function types
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///
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class FunctionType : public DerivedType {
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public:
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/// Function parameters can have attributes to indicate how they should be
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/// treated by optimizations and code generation. This enumeration lists the
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/// set of possible attributes.
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/// @brief Function parameter attributes enumeration.
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enum ParameterAttributes {
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NoAttributeSet = 0, ///< No attribute value has been set on the parameter
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ZExtAttribute = 1, ///< The parameter should be zero extended before call
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SExtAttribute = 2 ///< The parameter should be sign extended before call
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};
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typedef std::vector<ParameterAttributes> ParamAttrsList;
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private:
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friend class TypeMap<FunctionValType, FunctionType>;
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bool isVarArgs;
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ParamAttrsList *ParamAttrs;
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FunctionType(const FunctionType &); // Do not implement
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const FunctionType &operator=(const FunctionType &); // Do not implement
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FunctionType(const Type *Result, const std::vector<const Type*> &Params,
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bool IsVarArgs);
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bool IsVarArgs, const ParamAttrsList &Attrs);
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public:
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/// FunctionType::get - This static method is the primary way of constructing
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/// a FunctionType
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/// a FunctionType.
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///
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static FunctionType *get(const Type *Result,
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const std::vector<const Type*> &Params,
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bool isVarArg);
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static FunctionType *get(
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const Type *Result, ///< The result type
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const std::vector<const Type*> &Params, ///< The types of the parameters
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bool isVarArg, ///< Whether this is a variable argument length function
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const ParamAttrsList & Attrs = ParamAttrsList()
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///< Indicates the parameter attributes to use, if any. The 0th entry
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///< in the list refers to the return type. Parameters are numbered
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///< starting at 1.
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);
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inline bool isVarArg() const { return isVarArgs; }
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inline const Type *getReturnType() const { return ContainedTys[0]; }
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@ -106,6 +125,25 @@ public:
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///
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unsigned getNumParams() const { return unsigned(ContainedTys.size()-1); }
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/// The parameter attributes for the \p ith parameter are returned. The 0th
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/// parameter refers to the return type of the function.
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/// @returns The ParameterAttributes for the \p ith parameter.
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/// @brief Get the attributes for a parameter
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ParameterAttributes getParamAttrs(unsigned i) const;
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/// @brief Determine if a parameter attribute is set
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bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
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return getParamAttrs(i) & attr;
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}
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/// @brief Return the number of parameter attributes this type has.
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unsigned getNumAttrs() const {
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return (ParamAttrs ? unsigned(ParamAttrs->size()) : 0);
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}
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/// @brief Convert a ParameterAttribute into its assembly text
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static const char * getParamAttrsText(ParameterAttributes Attr);
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// Implement the AbstractTypeUser interface.
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virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
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virtual void typeBecameConcrete(const DerivedType *AbsTy);
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