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 "llvm/ADT/None.h"
21#include "llvm/ADT/Optional.h"
22#include <string>
23
24namespace llvm {
25
26class Type;
27class FunctionType;
28class Function;
29class LLVMContext;
30class Module;
31class AttributeSet;
32
33/// This namespace contains an enum with a value for every intrinsic/builtin
34/// function known by LLVM. The enum values are returned by
35/// Function::getIntrinsicID().
36namespace Intrinsic {
37  enum ID : unsigned {
38    not_intrinsic = 0,   // Must be zero
39
40    // Get the intrinsic enums generated from Intrinsics.td
41#define GET_INTRINSIC_ENUM_VALUES
42#include "llvm/IR/Intrinsics.gen"
43#undef GET_INTRINSIC_ENUM_VALUES
44    , num_intrinsics
45  };
46
47  /// Return the LLVM name for an intrinsic, such as "llvm.ppc.altivec.lvx".
48  /// Note, this version is for intrinsics with no overloads.  Use the other
49  /// version of getName if overloads are required.
50  StringRef getName(ID id);
51
52  /// Return the LLVM name for an intrinsic, such as "llvm.ppc.altivec.lvx".
53  /// Note, this version of getName supports overloads, but is less efficient
54  /// than the StringRef version of this function.  If no overloads are
55  /// requried, it is safe to use this version, but better to use the StringRef
56  /// version.
57  std::string getName(ID id, ArrayRef<Type*> Tys);
58
59  /// Return the function type for an intrinsic.
60  FunctionType *getType(LLVMContext &Context, ID id,
61                        ArrayRef<Type*> Tys = None);
62
63  /// Returns true if the intrinsic can be overloaded.
64  bool isOverloaded(ID id);
65
66  /// Returns true if the intrinsic is a leaf, i.e. it does not make any calls
67  /// itself.  Most intrinsics are leafs, the exceptions being the patchpoint
68  /// and statepoint intrinsics. These call (or invoke) their "target" argument.
69  bool isLeaf(ID id);
70
71  /// Return the attributes for an intrinsic.
72  AttributeSet getAttributes(LLVMContext &C, ID id);
73
74  /// Create or insert an LLVM Function declaration for an intrinsic, and return
75  /// it.
76  ///
77  /// The Tys parameter is for intrinsics with overloaded types (e.g., those
78  /// using iAny, fAny, vAny, or iPTRAny).  For a declaration of an overloaded
79  /// intrinsic, Tys must provide exactly one type for each overloaded type in
80  /// the intrinsic.
81  Function *getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys = None);
82
83  /// Looks up Name in NameTable via binary search. NameTable must be sorted
84  /// and all entries must start with "llvm.".  If NameTable contains an exact
85  /// match for Name or a prefix of Name followed by a dot, its index in
86  /// NameTable is returned. Otherwise, -1 is returned.
87  int lookupLLVMIntrinsicByName(ArrayRef<const char *> NameTable,
88                                StringRef Name);
89
90  /// Map a GCC builtin name to an intrinsic ID.
91  ID getIntrinsicForGCCBuiltin(const char *Prefix, StringRef BuiltinName);
92
93  /// Map a MS builtin name to an intrinsic ID.
94  ID getIntrinsicForMSBuiltin(const char *Prefix, StringRef BuiltinName);
95
96  /// This is a type descriptor which explains the type requirements of an
97  /// intrinsic. This is returned by getIntrinsicInfoTableEntries.
98  struct IITDescriptor {
99    enum IITDescriptorKind {
100      Void, VarArg, MMX, Token, Metadata, Half, Float, Double,
101      Integer, Vector, Pointer, Struct,
102      Argument, ExtendArgument, TruncArgument, HalfVecArgument,
103      SameVecWidthArgument, PtrToArgument, PtrToElt, VecOfPtrsToElt
104    } Kind;
105
106    union {
107      unsigned Integer_Width;
108      unsigned Float_Width;
109      unsigned Vector_Width;
110      unsigned Pointer_AddressSpace;
111      unsigned Struct_NumElements;
112      unsigned Argument_Info;
113    };
114
115    enum ArgKind {
116      AK_Any,
117      AK_AnyInteger,
118      AK_AnyFloat,
119      AK_AnyVector,
120      AK_AnyPointer
121    };
122    unsigned getArgumentNumber() const {
123      assert(Kind == Argument || Kind == ExtendArgument ||
124             Kind == TruncArgument || Kind == HalfVecArgument ||
125             Kind == SameVecWidthArgument || Kind == PtrToArgument ||
126             Kind == PtrToElt || Kind == VecOfPtrsToElt);
127      return Argument_Info >> 3;
128    }
129    ArgKind getArgumentKind() const {
130      assert(Kind == Argument || Kind == ExtendArgument ||
131             Kind == TruncArgument || Kind == HalfVecArgument ||
132             Kind == SameVecWidthArgument || Kind == PtrToArgument ||
133             Kind == VecOfPtrsToElt);
134      return (ArgKind)(Argument_Info & 7);
135    }
136
137    static IITDescriptor get(IITDescriptorKind K, unsigned Field) {
138      IITDescriptor Result = { K, { Field } };
139      return Result;
140    }
141  };
142
143  /// Return the IIT table descriptor for the specified intrinsic into an array
144  /// of IITDescriptors.
145  void getIntrinsicInfoTableEntries(ID id, SmallVectorImpl<IITDescriptor> &T);
146
147  /// Match the specified type (which comes from an intrinsic argument or return
148  /// value) with the type constraints specified by the .td file. If the given
149  /// type is an overloaded type it is pushed to the ArgTys vector.
150  ///
151  /// Returns false if the given type matches with the constraints, true
152  /// otherwise.
153  bool matchIntrinsicType(Type *Ty, ArrayRef<IITDescriptor> &Infos,
154                          SmallVectorImpl<Type*> &ArgTys);
155
156  /// Verify if the intrinsic has variable arguments. This method is intended to
157  /// be called after all the fixed arguments have been matched first.
158  ///
159  /// This method returns true on error.
160  bool matchIntrinsicVarArg(bool isVarArg, ArrayRef<IITDescriptor> &Infos);
161
162  // Checks if the intrinsic name matches with its signature and if not
163  // returns the declaration with the same signature and remangled name.
164  llvm::Optional<Function*> remangleIntrinsicFunction(Function *F);
165
166} // End Intrinsic namespace
167
168} // End llvm namespace
169
170#endif
171