1//===--- TypeTraits.cpp - Type Traits Support -----------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the type traits support functions.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Basic/TypeTraits.h"
14#include "llvm/Support/ErrorHandling.h"
15#include <cassert>
16#include <cstring>
17using namespace clang;
18
19static constexpr const char *TypeTraitNames[] = {
20#define TYPE_TRAIT_1(Spelling, Name, Key) #Name,
21#include "clang/Basic/TokenKinds.def"
22#define TYPE_TRAIT_2(Spelling, Name, Key) #Name,
23#include "clang/Basic/TokenKinds.def"
24#define TYPE_TRAIT_N(Spelling, Name, Key) #Name,
25#include "clang/Basic/TokenKinds.def"
26};
27
28static constexpr const char *TypeTraitSpellings[] = {
29#define TYPE_TRAIT_1(Spelling, Name, Key) #Spelling,
30#include "clang/Basic/TokenKinds.def"
31#define TYPE_TRAIT_2(Spelling, Name, Key) #Spelling,
32#include "clang/Basic/TokenKinds.def"
33#define TYPE_TRAIT_N(Spelling, Name, Key) #Spelling,
34#include "clang/Basic/TokenKinds.def"
35};
36
37static constexpr const char *ArrayTypeTraitNames[] = {
38#define ARRAY_TYPE_TRAIT(Spelling, Name, Key) #Name,
39#include "clang/Basic/TokenKinds.def"
40};
41
42static constexpr const char *ArrayTypeTraitSpellings[] = {
43#define ARRAY_TYPE_TRAIT(Spelling, Name, Key) #Spelling,
44#include "clang/Basic/TokenKinds.def"
45};
46
47static constexpr const char *UnaryExprOrTypeTraitNames[] = {
48#define UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key) #Name,
49#define CXX11_UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key) #Name,
50#include "clang/Basic/TokenKinds.def"
51};
52
53static constexpr const char *UnaryExprOrTypeTraitSpellings[] = {
54#define UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key) #Spelling,
55#define CXX11_UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key) #Spelling,
56#include "clang/Basic/TokenKinds.def"
57};
58
59static constexpr const unsigned TypeTraitArities[] = {
60#define TYPE_TRAIT_1(Spelling, Name, Key) 1,
61#include "clang/Basic/TokenKinds.def"
62#define TYPE_TRAIT_2(Spelling, Name, Key) 2,
63#include "clang/Basic/TokenKinds.def"
64#define TYPE_TRAIT_N(Spelling, Name, Key) 0,
65#include "clang/Basic/TokenKinds.def"
66};
67
68const char *clang::getTraitName(TypeTrait T) {
69 assert(T <= TT_Last && "invalid enum value!");
70 return TypeTraitNames[T];
71}
72
73const char *clang::getTraitName(ArrayTypeTrait T) {
74 assert(T <= ATT_Last && "invalid enum value!");
75 return ArrayTypeTraitNames[T];
76}
77
78const char *clang::getTraitName(UnaryExprOrTypeTrait T) {
79 assert(T <= UETT_Last && "invalid enum value!");
80 return UnaryExprOrTypeTraitNames[T];
81}
82
83const char *clang::getTraitSpelling(TypeTrait T) {
84 assert(T <= TT_Last && "invalid enum value!");
85 if (T == BTT_IsDeducible) {
86 // The __is_deducible is an internal-only type trait. To hide it from
87 // external users, we define it with an empty spelling name, preventing the
88 // clang parser from recognizing its token kind.
89 // However, other components such as the AST dump still require the real
90 // type trait name. Therefore, we return the real name when needed.
91 assert(std::strlen(TypeTraitSpellings[T]) == 0);
92 return "__is_deducible";
93 }
94 return TypeTraitSpellings[T];
95}
96
97const char *clang::getTraitSpelling(ArrayTypeTrait T) {
98 assert(T <= ATT_Last && "invalid enum value!");
99 return ArrayTypeTraitSpellings[T];
100}
101
102const char *clang::getTraitSpelling(UnaryExprOrTypeTrait T) {
103 assert(T <= UETT_Last && "invalid enum value!");
104 return UnaryExprOrTypeTraitSpellings[T];
105}
106
107unsigned clang::getTypeTraitArity(TypeTrait T) {
108 assert(T <= TT_Last && "invalid enum value!");
109 return TypeTraitArities[T];
110}
111