zinovy.nis created this revision.
zinovy.nis added reviewers: malcolm.parsons, alexfh.
zinovy.nis added a project: clang-tools-extra.
Herald added subscribers: cfe-commits, xazax.hun.
This patch is a fix for https://reviews.llvm.org/D45405 where spaces were also
considered as a part of a type name. So length("int *") was 5 instead of 3 with
RemoveStars=0 or 4 with RemoveStars=1.
Repository:
rCTE Clang Tools Extra
https://reviews.llvm.org/D45927
Files:
clang-tidy/modernize/UseAutoCheck.cpp
clang-tidy/modernize/UseAutoCheck.h
docs/clang-tidy/checks/modernize-use-auto.rst
test/clang-tidy/modernize-use-auto-min-type-name-length.cpp
Index: test/clang-tidy/modernize-use-auto-min-type-name-length.cpp
===================================================================
--- test/clang-tidy/modernize-use-auto-min-type-name-length.cpp
+++ test/clang-tidy/modernize-use-auto-min-type-name-length.cpp
@@ -1,29 +1,82 @@
-// RUN: %check_clang_tidy %s modernize-use-auto %t -- \
-// RUN: -config="{CheckOptions: [{key: modernize-use-auto.MinTypeNameLength, value: '5'}]}" \
-// RUN: -- -std=c++11 -frtti
+// RUN: %check_clang_tidy -check-suffix=0-0 %s modernize-use-auto %t -- -config="{CheckOptions: [{key: modernize-use-auto.RemoveStars, value: 0}, {key: modernize-use-auto.MinTypeNameLength, value: 0}]}" -- --std=c++11 -frtti
+// RUN: %check_clang_tidy -check-suffix=0-5 %s modernize-use-auto %t -- -config="{CheckOptions: [{key: modernize-use-auto.RemoveStars, value: 0}, {key: modernize-use-auto.MinTypeNameLength, value: 5}]}" -- --std=c++11 -frtti
+// RUN: %check_clang_tidy -check-suffix=1-0 %s modernize-use-auto %t -- -config="{CheckOptions: [{key: modernize-use-auto.RemoveStars, value: 1}, {key: modernize-use-auto.MinTypeNameLength, value: 0}]}" -- --std=c++11 -frtti
+// RUN: %check_clang_tidy -check-suffix=1-5 %s modernize-use-auto %t -- -config="{CheckOptions: [{key: modernize-use-auto.RemoveStars, value: 1}, {key: modernize-use-auto.MinTypeNameLength, value: 5}]}" -- --std=c++11 -frtti
-extern int foo();
-
-using VeryVeryVeryLongTypeName = int;
+template <class T>
+extern T foo();
int bar() {
- int a = static_cast<VeryVeryVeryLongTypeName>(foo());
- // strlen('int') = 4 < 5, so skip it,
- // even strlen('VeryVeryVeryLongTypeName') > 5.
-
- unsigned b = static_cast<unsigned>(foo());
- // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
- // CHECK-FIXES: auto b = static_cast<unsigned>(foo());
-
- bool c = static_cast<bool>(foo());
- // strlen('bool') = 4 < 5, so skip it.
-
- const bool c1 = static_cast<const bool>(foo());
- // strlen('bool') = 4 < 5, so skip it, even there's a 'const'.
-
- unsigned long long ull = static_cast<unsigned long long>(foo());
- // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
- // CHECK-FIXES: auto ull = static_cast<unsigned long long>(foo());
+ {
+ using VeryVeryVeryLongTypeName = int;
+ int i = static_cast<VeryVeryVeryLongTypeName>(foo<int>());
+ // CHECK-FIXES-0-0: auto i = {{.*}}
+ // CHECK-FIXES-0-5: int i = {{.*}}
+ // CHECK-FIXES-1-0: auto i = {{.*}}
+ // CHECK-FIXES-1-5: int i = {{.*}}
+ int *pi = static_cast<VeryVeryVeryLongTypeName *>(foo<int*>());
+ // CHECK-FIXES-0-0: auto *pi = {{.*}}
+ // CHECK-FIXES-0-5: int *pi = {{.*}}
+ // CHECK-FIXES-1-0: auto pi = {{.*}}
+ // CHECK-FIXES-1-5: int *pi = {{.*}}
+ int **ppi = static_cast<VeryVeryVeryLongTypeName **>(foo<int**>());
+ // CHECK-FIXES-0-0: auto **ppi = {{.*}}
+ // CHECK-FIXES-0-5: int **ppi = {{.*}}
+ // CHECK-FIXES-1-0: auto ppi = {{.*}}
+ // CHECK-FIXES-1-5: auto ppi = {{.*}}
+ }
+
+ {
+ bool b = static_cast<bool>(foo<bool>());
+ // CHECK-FIXES-0-0: auto b = {{.*}}
+ // CHECK-FIXES-0-5: bool b = {{.*}}
+ // CHECK-FIXES-1-0: auto b = {{.*}}
+ // CHECK-FIXES-1-5: bool b = {{.*}}
+ bool *pb = static_cast<bool *>(foo<bool*>());
+ // CHECK-FIXES-0-0: auto *pb = {{.*}}
+ // CHECK-FIXES-0-5: bool *pb = {{.*}}
+ // CHECK-FIXES-1-0: auto pb = {{.*}}
+ // CHECK-FIXES-1-5: auto pb = {{.*}}
+ }
+
+ {
+ const bool cb = static_cast<const bool>(foo<const bool>());
+ // CHECK-FIXES-0-0: auto cb = {{.*}}
+ // CHECK-FIXES-0-5: bool cb = {{.*}}
+ // CHECK-FIXES-1-0: auto cb = {{.*}}
+ // CHECK-FIXES-1-5: bool cb = {{.*}}
+ const bool *pcb = static_cast<const bool *>(foo<const bool*>());
+ // CHECK-FIXES-0-0: const auto *pcb = {{.*}}
+ // CHECK-FIXES-0-5: const bool *pcb = {{.*}}
+ // CHECK-FIXES-1-0: const auto pcb = {{.*}}
+ // CHECK-FIXES-1-5: const auto pcb = {{.*}}
+ }
+
+ {
+ long int li = static_cast<long int>(foo<long int>());
+ // CHECK-FIXES-0-0: auto li = {{.*}}
+ // CHECK-FIXES-0-5: auto li = {{.*}}
+ // CHECK-FIXES-1-0: auto li = {{.*}}
+ // CHECK-FIXES-1-5: auto li = {{.*}}
+ long int *pli = static_cast<long int *>(foo<long int*>());
+ // CHECK-FIXES-0-0: auto *pli = {{.*}}
+ // CHECK-FIXES-0-5: auto *pli = {{.*}}
+ // CHECK-FIXES-1-0: auto pli = {{.*}}
+ // CHECK-FIXES-1-5: auto pli = {{.*}}
+ }
+
+ {
+ unsigned long long ull = static_cast<unsigned long long>(foo<unsigned long long>());
+ // CHECK-FIXES-0-0: auto ull = {{.*}}
+ // CHECK-FIXES-0-5: auto ull = {{.*}}
+ // CHECK-FIXES-1-0: auto ull = {{.*}}
+ // CHECK-FIXES-1-5: auto ull = {{.*}}
+ unsigned long long *pull = static_cast<unsigned long long *>(foo<unsigned long long*>());
+ // CHECK-FIXES-0-0: auto *pull = {{.*}}
+ // CHECK-FIXES-0-5: auto *pull = {{.*}}
+ // CHECK-FIXES-1-0: auto pull = {{.*}}
+ // CHECK-FIXES-1-5: auto pull = {{.*}}
+ }
return 1;
}
Index: docs/clang-tidy/checks/modernize-use-auto.rst
===================================================================
--- docs/clang-tidy/checks/modernize-use-auto.rst
+++ docs/clang-tidy/checks/modernize-use-auto.rst
@@ -182,20 +182,38 @@
If the option is set to non-zero (default `5`), the check will ignore type
names having a length less than the option value. The option affects
expressions only, not iterators.
+ If ``RemoveStars`` option (see below) is set to non-zero, then ``*s`` in
+ the type are also counted as a part of the type name.
.. code-block:: c++
- // MinTypeNameLength = 0
+ // MinTypeNameLength = 0, RemoveStars=0
int a = static_cast<int>(foo()); // ---> auto a = ...
bool b = new bool; // ---> auto b = ...
unsigned c = static_cast<unsigned>(foo()); // ---> auto c = ...
- // MinTypeNameLength = 8
+ // MinTypeNameLength = 5, RemoveStars=0
- int a = static_cast<int>(foo()); // ---> int a = ...
- bool b = new bool; // ---> bool b = ...
- unsigned c = static_cast<unsigned>(foo()); // ---> auto c = ...
+ int a = static_cast<int>(foo()); // ---> int a = ...
+ bool b = static_cast<bool>(foo()); // ---> bool b = ...
+ // length(bool *)=4 when RemoveStars is 0
+ bool *pb = static_cast<bool*>(foo()); // ---> bool *pb = ...
+ unsigned c = static_cast<unsigned>(foo()); // ---> auto c = ...
+ // length(long int) = 4 + 3 = 7
+ long int d = static_cast<unsigned int>(foo()); // ---> auto d = ...
+
+ // MinTypeNameLength = 5, RemoveStars=1
+
+ int a = static_cast<int>(foo()); // ---> int a = ...
+ // length(int **)=5 when RemoveStars is 1
+ int **pa = static_cast<int**>(foo()); // ---> auto pa = ...
+ bool b = static_cast<bool>(foo()); // ---> bool b = ...
+ // length(bool *)=5 when RemoveStars is 1
+ bool *pb = static_cast<bool*>(foo()); // ---> auto pb = ...
+ unsigned c = static_cast<unsigned>(foo()); // ---> auto c = ...
+ // length(long int) = 4 + 3 = 7
+ long int d = static_cast<unsigned int>(foo()); // ---> auto d = ...
.. option:: RemoveStars
Index: clang-tidy/modernize/UseAutoCheck.h
===================================================================
--- clang-tidy/modernize/UseAutoCheck.h
+++ clang-tidy/modernize/UseAutoCheck.h
@@ -28,9 +28,12 @@
void replaceExpr(const DeclStmt *D, ASTContext *Context,
llvm::function_ref<QualType(const Expr *)> GetType,
StringRef Message);
+ size_t GetTypeNameLength(const SourceRange &SR, const ASTContext &Context);
const unsigned int MinTypeNameLength;
const bool RemoveStars;
+
+ std::function<bool(const char&)> SpacePredicate;
};
} // namespace modernize
Index: clang-tidy/modernize/UseAutoCheck.cpp
===================================================================
--- clang-tidy/modernize/UseAutoCheck.cpp
+++ clang-tidy/modernize/UseAutoCheck.cpp
@@ -12,6 +12,8 @@
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Tooling/FixIt.h"
+#include <algorithm>
+#include <cctype>
using namespace clang;
using namespace clang::ast_matchers;
@@ -27,6 +29,13 @@
const char DeclWithCastId[] = "decl_cast";
const char DeclWithTemplateCastId[] = "decl_template";
+
+bool IsNotSpace(const char& C) {
+ return !std::isspace(static_cast<unsigned char>(C));
+}
+
+bool IsNotSpaceOrStar(const char &C) { return C != '*' && IsNotSpace(C); }
+
/// \brief Matches variable declarations that have explicit initializers that
/// are not initializer lists.
///
@@ -289,7 +298,8 @@
UseAutoCheck::UseAutoCheck(StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
MinTypeNameLength(Options.get("MinTypeNameLength", 5)),
- RemoveStars(Options.get("RemoveStars", 0)) {}
+ RemoveStars(Options.get("RemoveStars", 0)),
+ SpacePredicate(RemoveStars ? IsNotSpace : IsNotSpaceOrStar) {}
void UseAutoCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "MinTypeNameLength", MinTypeNameLength);
@@ -417,10 +427,9 @@
Loc = Loc.getNextTypeLoc();
}
SourceRange Range(Loc.getSourceRange());
-
if (MinTypeNameLength != 0 &&
- tooling::fixit::getText(Loc.getSourceRange(), FirstDecl->getASTContext())
- .size() < MinTypeNameLength)
+ GetTypeNameLength(Loc.getSourceRange(), FirstDecl->getASTContext()
+ ) < MinTypeNameLength)
return;
auto Diag = diag(Range.getBegin(), Message);
@@ -433,6 +442,12 @@
<< StarRemovals;
}
+size_t UseAutoCheck::GetTypeNameLength(const SourceRange &SR,
+ const ASTContext &Context) {
+ const StringRef S = tooling::fixit::getText(SR, Context);
+ return std::count_if(S.begin(), S.end(), SpacePredicate);
+}
+
void UseAutoCheck::check(const MatchFinder::MatchResult &Result) {
if (const auto *Decl = Result.Nodes.getNodeAs<DeclStmt>(IteratorDeclStmtId)) {
replaceIterators(Decl, Result.Context);
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