Intrinsics.h

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//===-- llvm/Instrinsics.h - LLVM Intrinsic Function Handling ---*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a set of enums which allow processing of intrinsic
// functions.  Values of these enum types are returned by
// Function::getIntrinsicID.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_IR_INTRINSICS_H
#define LLVM_IR_INTRINSICS_H

#include "llvm/ADT/ArrayRef.h"
#include <string>

namespace llvm {

class Type;
class FunctionType;
class Function;
class LLVMContext;
class Module;
class AttributeSet;

/// Intrinsic Namespace - This namespace contains an enum with a value for
/// every intrinsic/builtin function known by LLVM.  These enum values are
/// returned by Function::getIntrinsicID().
///
namespace Intrinsic {
  enum ID {
    not_intrinsic = 0,   // Must be zero

    // Get the intrinsic enums generated from Intrinsics.td
#define GET_INTRINSIC_ENUM_VALUES
#include "llvm/IR/Intrinsics.gen"
#undef GET_INTRINSIC_ENUM_VALUES
    , num_intrinsics
  };
  
  /// Intrinsic::getName(ID) - Return the LLVM name for an intrinsic, such as
  /// "llvm.ppc.altivec.lvx".
  std::string getName(ID id, ArrayRef<Type*> Tys = None);

  /// Intrinsic::getType(ID) - Return the function type for an intrinsic.
  ///
  FunctionType *getType(LLVMContext &Context, ID id,
                        ArrayRef<Type*> Tys = None);

  /// Intrinsic::isOverloaded(ID) - Returns true if the intrinsic can be
  /// overloaded.
  bool isOverloaded(ID id);

  /// Intrinsic::getAttributes(ID) - Return the attributes for an intrinsic.
  ///
  AttributeSet getAttributes(LLVMContext &C, ID id);

  /// Intrinsic::getDeclaration(M, ID) - Create or insert an LLVM Function
  /// declaration for an intrinsic, and return it.
  ///
  /// The Tys parameter is for intrinsics with overloaded types (e.g., those
  /// using iAny, fAny, vAny, or iPTRAny).  For a declaration of an overloaded
  /// intrinsic, Tys must provide exactly one type for each overloaded type in
  /// the intrinsic.
  Function *getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys = None);

  /// Map a GCC builtin name to an intrinsic ID.
  ID getIntrinsicForGCCBuiltin(const char *Prefix, const char *BuiltinName);

  /// Map a MS builtin name to an intrinsic ID.
  ID getIntrinsicForMSBuiltin(const char *Prefix, const char *BuiltinName);
  
  /// IITDescriptor - This is a type descriptor which explains the type
  /// requirements of an intrinsic.  This is returned by
  /// getIntrinsicInfoTableEntries.
  struct IITDescriptor {
    enum IITDescriptorKind {
      Void, VarArg, MMX, Metadata, Half, Float, Double,
      Integer, Vector, Pointer, Struct,
      Argument, ExtendArgument, TruncArgument, HalfVecArgument
    } Kind;
    
    union {
      unsigned Integer_Width;
      unsigned Float_Width;
      unsigned Vector_Width;
      unsigned Pointer_AddressSpace;
      unsigned Struct_NumElements;
      unsigned Argument_Info;
    };
    
    enum ArgKind {
      AK_AnyInteger,
      AK_AnyFloat,
      AK_AnyVector,
      AK_AnyPointer
    };
    unsigned getArgumentNumber() const {
      assert(Kind == Argument || Kind == ExtendArgument ||
             Kind == TruncArgument || Kind == HalfVecArgument);
      return Argument_Info >> 2;
    }
    ArgKind getArgumentKind() const {
      assert(Kind == Argument || Kind == ExtendArgument ||
             Kind == TruncArgument || Kind == HalfVecArgument);
      return (ArgKind)(Argument_Info&3);
    }
    
    static IITDescriptor get(IITDescriptorKind K, unsigned Field) {
      IITDescriptor Result = { K, { Field } };
      return Result;
    }
  };
  
  /// getIntrinsicInfoTableEntries - Return the IIT table descriptor for the
  /// specified intrinsic into an array of IITDescriptors.
  /// 
  void getIntrinsicInfoTableEntries(ID id, SmallVectorImpl<IITDescriptor> &T);
  
} // End Intrinsic namespace

} // End llvm namespace

#endif