Intrinsics.h revision 276479 
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
22namespace llvm {
23
24class Type;
25class FunctionType;
26class Function;
27class LLVMContext;
28class Module;
29class 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///
35namespace 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