1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
//===--- TypePromotionInMathFnCheck.cpp - clang-tidy-----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "TypePromotionInMathFnCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/StringSet.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace performance {
namespace {
AST_MATCHER_P(Type, isBuiltinType, BuiltinType::Kind, Kind) {
if (const auto *BT = dyn_cast<BuiltinType>(&Node)) {
return BT->getKind() == Kind;
}
return false;
}
} // anonymous namespace
TypePromotionInMathFnCheck::TypePromotionInMathFnCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
IncludeInserter(Options.getLocalOrGlobal("IncludeStyle",
utils::IncludeSorter::IS_LLVM)) {
}
void TypePromotionInMathFnCheck::registerPPCallbacks(
const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) {
IncludeInserter.registerPreprocessor(PP);
}
void TypePromotionInMathFnCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "IncludeStyle", IncludeInserter.getStyle());
}
void TypePromotionInMathFnCheck::registerMatchers(MatchFinder *Finder) {
constexpr BuiltinType::Kind IntTy = BuiltinType::Int;
constexpr BuiltinType::Kind LongTy = BuiltinType::Long;
constexpr BuiltinType::Kind FloatTy = BuiltinType::Float;
constexpr BuiltinType::Kind DoubleTy = BuiltinType::Double;
constexpr BuiltinType::Kind LongDoubleTy = BuiltinType::LongDouble;
auto HasBuiltinTyParam = [](int Pos, BuiltinType::Kind Kind) {
return hasParameter(Pos, hasType(isBuiltinType(Kind)));
};
auto HasBuiltinTyArg = [](int Pos, BuiltinType::Kind Kind) {
return hasArgument(Pos, hasType(isBuiltinType(Kind)));
};
// Match calls to foo(double) with a float argument.
auto OneDoubleArgFns = hasAnyName(
"::acos", "::acosh", "::asin", "::asinh", "::atan", "::atanh", "::cbrt",
"::ceil", "::cos", "::cosh", "::erf", "::erfc", "::exp", "::exp2",
"::expm1", "::fabs", "::floor", "::ilogb", "::lgamma", "::llrint",
"::log", "::log10", "::log1p", "::log2", "::logb", "::lrint", "::modf",
"::nearbyint", "::rint", "::round", "::sin", "::sinh", "::sqrt", "::tan",
"::tanh", "::tgamma", "::trunc", "::llround", "::lround");
Finder->addMatcher(
callExpr(callee(functionDecl(OneDoubleArgFns, parameterCountIs(1),
HasBuiltinTyParam(0, DoubleTy))),
HasBuiltinTyArg(0, FloatTy))
.bind("call"),
this);
// Match calls to foo(double, double) where both args are floats.
auto TwoDoubleArgFns = hasAnyName("::atan2", "::copysign", "::fdim", "::fmax",
"::fmin", "::fmod", "::hypot", "::ldexp",
"::nextafter", "::pow", "::remainder");
Finder->addMatcher(
callExpr(callee(functionDecl(TwoDoubleArgFns, parameterCountIs(2),
HasBuiltinTyParam(0, DoubleTy),
HasBuiltinTyParam(1, DoubleTy))),
HasBuiltinTyArg(0, FloatTy), HasBuiltinTyArg(1, FloatTy))
.bind("call"),
this);
// Match calls to fma(double, double, double) where all args are floats.
Finder->addMatcher(
callExpr(callee(functionDecl(hasName("::fma"), parameterCountIs(3),
HasBuiltinTyParam(0, DoubleTy),
HasBuiltinTyParam(1, DoubleTy),
HasBuiltinTyParam(2, DoubleTy))),
HasBuiltinTyArg(0, FloatTy), HasBuiltinTyArg(1, FloatTy),
HasBuiltinTyArg(2, FloatTy))
.bind("call"),
this);
// Match calls to frexp(double, int*) where the first arg is a float.
Finder->addMatcher(
callExpr(callee(functionDecl(
hasName("::frexp"), parameterCountIs(2),
HasBuiltinTyParam(0, DoubleTy),
hasParameter(1, parmVarDecl(hasType(pointerType(
pointee(isBuiltinType(IntTy)))))))),
HasBuiltinTyArg(0, FloatTy))
.bind("call"),
this);
// Match calls to nexttoward(double, long double) where the first arg is a
// float.
Finder->addMatcher(
callExpr(callee(functionDecl(hasName("::nexttoward"), parameterCountIs(2),
HasBuiltinTyParam(0, DoubleTy),
HasBuiltinTyParam(1, LongDoubleTy))),
HasBuiltinTyArg(0, FloatTy))
.bind("call"),
this);
// Match calls to remquo(double, double, int*) where the first two args are
// floats.
Finder->addMatcher(
callExpr(
callee(functionDecl(
hasName("::remquo"), parameterCountIs(3),
HasBuiltinTyParam(0, DoubleTy), HasBuiltinTyParam(1, DoubleTy),
hasParameter(2, parmVarDecl(hasType(pointerType(
pointee(isBuiltinType(IntTy)))))))),
HasBuiltinTyArg(0, FloatTy), HasBuiltinTyArg(1, FloatTy))
.bind("call"),
this);
// Match calls to scalbln(double, long) where the first arg is a float.
Finder->addMatcher(
callExpr(callee(functionDecl(hasName("::scalbln"), parameterCountIs(2),
HasBuiltinTyParam(0, DoubleTy),
HasBuiltinTyParam(1, LongTy))),
HasBuiltinTyArg(0, FloatTy))
.bind("call"),
this);
// Match calls to scalbn(double, int) where the first arg is a float.
Finder->addMatcher(
callExpr(callee(functionDecl(hasName("::scalbn"), parameterCountIs(2),
HasBuiltinTyParam(0, DoubleTy),
HasBuiltinTyParam(1, IntTy))),
HasBuiltinTyArg(0, FloatTy))
.bind("call"),
this);
// modf(double, double*) is omitted because the second parameter forces the
// type -- there's no conversion from float* to double*.
}
void TypePromotionInMathFnCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Call = Result.Nodes.getNodeAs<CallExpr>("call");
assert(Call != nullptr);
StringRef OldFnName = Call->getDirectCallee()->getName();
// In C++ mode, we prefer std::foo to ::foof. But some of these suggestions
// are only valid in C++11 and newer.
static llvm::StringSet<> Cpp11OnlyFns = {
"acosh", "asinh", "atanh", "cbrt", "copysign", "erf",
"erfc", "exp2", "expm1", "fdim", "fma", "fmax",
"fmin", "hypot", "ilogb", "lgamma", "llrint", "llround",
"log1p", "log2", "logb", "lrint", "lround", "nearbyint",
"nextafter", "nexttoward", "remainder", "remquo", "rint", "round",
"scalbln", "scalbn", "tgamma", "trunc"};
bool StdFnRequiresCpp11 = Cpp11OnlyFns.count(OldFnName);
std::string NewFnName;
bool FnInCmath = false;
if (getLangOpts().CPlusPlus &&
(!StdFnRequiresCpp11 || getLangOpts().CPlusPlus11)) {
NewFnName = ("std::" + OldFnName).str();
FnInCmath = true;
} else {
NewFnName = (OldFnName + "f").str();
}
auto Diag = diag(Call->getExprLoc(), "call to '%0' promotes float to double")
<< OldFnName
<< FixItHint::CreateReplacement(
Call->getCallee()->getSourceRange(), NewFnName);
// Suggest including <cmath> if the function we're suggesting is declared in
// <cmath> and it's not already included. We never have to suggest including
// <math.h>, because the functions we're suggesting moving away from are all
// declared in <math.h>.
if (FnInCmath)
Diag << IncludeInserter.createIncludeInsertion(
Result.Context->getSourceManager().getFileID(Call->getBeginLoc()),
"<cmath>");
}
} // namespace performance
} // namespace tidy
} // namespace clang
|
