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      1 //===-- llvm/Instrinsics.h - LLVM Intrinsic Function Handling ---*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file defines a set of enums which allow processing of intrinsic
     11 // functions.  Values of these enum types are returned by
     12 // Function::getIntrinsicID.
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #ifndef LLVM_IR_INTRINSICS_H
     17 #define LLVM_IR_INTRINSICS_H
     18 
     19 #include "llvm/ADT/ArrayRef.h"
     20 #include <string>
     21 
     22 namespace llvm {
     23 
     24 class Type;
     25 class FunctionType;
     26 class Function;
     27 class LLVMContext;
     28 class Module;
     29 class AttributeSet;
     30 
     31 /// Intrinsic Namespace - This namespace contains an enum with a value for
     32 /// every intrinsic/builtin function known by LLVM.  These enum values are
     33 /// returned by Function::getIntrinsicID().
     34 ///
     35 namespace Intrinsic {
     36   enum ID {
     37     not_intrinsic = 0,   // Must be zero
     38 
     39     // Get the intrinsic enums generated from Intrinsics.td
     40 #define GET_INTRINSIC_ENUM_VALUES
     41 #include "llvm/IR/Intrinsics.gen"
     42 #undef GET_INTRINSIC_ENUM_VALUES
     43     , num_intrinsics
     44   };
     45 
     46   /// Intrinsic::getName(ID) - Return the LLVM name for an intrinsic, such as
     47   /// "llvm.ppc.altivec.lvx".
     48   std::string getName(ID id, ArrayRef<Type*> Tys = None);
     49 
     50   /// Intrinsic::getType(ID) - Return the function type for an intrinsic.
     51   ///
     52   FunctionType *getType(LLVMContext &Context, ID id,
     53                         ArrayRef<Type*> Tys = None);
     54 
     55   /// Intrinsic::isOverloaded(ID) - Returns true if the intrinsic can be
     56   /// overloaded.
     57   bool isOverloaded(ID id);
     58 
     59   /// Intrinsic::getAttributes(ID) - Return the attributes for an intrinsic.
     60   ///
     61   AttributeSet getAttributes(LLVMContext &C, ID id);
     62 
     63   /// Intrinsic::getDeclaration(M, ID) - Create or insert an LLVM Function
     64   /// declaration for an intrinsic, and return it.
     65   ///
     66   /// The Tys parameter is for intrinsics with overloaded types (e.g., those
     67   /// using iAny, fAny, vAny, or iPTRAny).  For a declaration of an overloaded
     68   /// intrinsic, Tys must provide exactly one type for each overloaded type in
     69   /// the intrinsic.
     70   Function *getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys = None);
     71 
     72   /// Map a GCC builtin name to an intrinsic ID.
     73   ID getIntrinsicForGCCBuiltin(const char *Prefix, const char *BuiltinName);
     74 
     75   /// Map a MS builtin name to an intrinsic ID.
     76   ID getIntrinsicForMSBuiltin(const char *Prefix, const char *BuiltinName);
     77 
     78   /// IITDescriptor - This is a type descriptor which explains the type
     79   /// requirements of an intrinsic.  This is returned by
     80   /// getIntrinsicInfoTableEntries.
     81   struct IITDescriptor {
     82     enum IITDescriptorKind {
     83       Void, VarArg, MMX, Metadata, Half, Float, Double,
     84       Integer, Vector, Pointer, Struct,
     85       Argument, ExtendArgument, TruncArgument, HalfVecArgument
     86     } Kind;
     87 
     88     union {
     89       unsigned Integer_Width;
     90       unsigned Float_Width;
     91       unsigned Vector_Width;
     92       unsigned Pointer_AddressSpace;
     93       unsigned Struct_NumElements;
     94       unsigned Argument_Info;
     95     };
     96 
     97     enum ArgKind {
     98       AK_AnyInteger,
     99       AK_AnyFloat,
    100       AK_AnyVector,
    101       AK_AnyPointer
    102     };
    103     unsigned getArgumentNumber() const {
    104       assert(Kind == Argument || Kind == ExtendArgument ||
    105              Kind == TruncArgument || Kind == HalfVecArgument);
    106       return Argument_Info >> 2;
    107     }
    108     ArgKind getArgumentKind() const {
    109       assert(Kind == Argument || Kind == ExtendArgument ||
    110              Kind == TruncArgument || Kind == HalfVecArgument);
    111       return (ArgKind)(Argument_Info&3);
    112     }
    113 
    114     static IITDescriptor get(IITDescriptorKind K, unsigned Field) {
    115       IITDescriptor Result = { K, { Field } };
    116       return Result;
    117     }
    118   };
    119 
    120   /// getIntrinsicInfoTableEntries - Return the IIT table descriptor for the
    121   /// specified intrinsic into an array of IITDescriptors.
    122   ///
    123   void getIntrinsicInfoTableEntries(ID id, SmallVectorImpl<IITDescriptor> &T);
    124 
    125 } // End Intrinsic namespace
    126 
    127 } // End llvm namespace
    128 
    129 #endif
    130