[flang-commits] [clang] [libcxx] [flang] [llvm] [compiler-rt] [clang-tools-extra] [openmp] [libc] [clang-tidy] Add bugprone-move-shared-pointer-contents check. (PR #67467)
via flang-commits
flang-commits at lists.llvm.org
Fri Jan 5 13:52:30 PST 2024
https://github.com/pizzud updated https://github.com/llvm/llvm-project/pull/67467
>From 6d5d35e1273f595e8a0382053d5183cbce7a9d8a Mon Sep 17 00:00:00 2001
From: David Pizzuto <pizzud at google.com>
Date: Tue, 26 Sep 2023 10:45:42 -0700
Subject: [PATCH 1/6] [clang-tidy] Add bugprone-move-shared-pointer-contents
check.
This check detects moves of the contents of a shared pointer rather than the
pointer itself. Other code with a reference to the shared pointer is probably
not expecting the move.
The set of shared pointer classes is configurable via options to allow individual
projects to cover additional types.
---
.../bugprone/BugproneTidyModule.cpp | 3 +
.../clang-tidy/bugprone/CMakeLists.txt | 2 +
.../MoveSharedPointerContentsCheck.cpp | 60 ++++++++++++++++
.../bugprone/MoveSharedPointerContentsCheck.h | 37 ++++++++++
clang-tools-extra/docs/ReleaseNotes.rst | 6 ++
.../bugprone/move-shared-pointer-contents.rst | 17 +++++
.../docs/clang-tidy/checks/list.rst | 2 +
.../bugprone/move-shared-pointer-contents.cpp | 68 +++++++++++++++++++
8 files changed, 195 insertions(+)
create mode 100644 clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
create mode 100644 clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
create mode 100644 clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
create mode 100644 clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
index a67a91eedd1048..7f4a504f9930f1 100644
--- a/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
@@ -39,6 +39,7 @@
#include "MisplacedPointerArithmeticInAllocCheck.h"
#include "MisplacedWideningCastCheck.h"
#include "MoveForwardingReferenceCheck.h"
+#include "MoveSharedPointerContentsCheck.h"
#include "MultiLevelImplicitPointerConversionCheck.h"
#include "MultipleNewInOneExpressionCheck.h"
#include "MultipleStatementMacroCheck.h"
@@ -125,6 +126,8 @@ class BugproneModule : public ClangTidyModule {
"bugprone-inaccurate-erase");
CheckFactories.registerCheck<IncorrectEnableIfCheck>(
"bugprone-incorrect-enable-if");
+ CheckFactories.registerCheck<MoveSharedPointerContentsCheck>(
+ "bugprone-move-shared-pointer-contents");
CheckFactories.registerCheck<SwitchMissingDefaultCaseCheck>(
"bugprone-switch-missing-default-case");
CheckFactories.registerCheck<IncDecInConditionsCheck>(
diff --git a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
index 3c768021feb150..c017f0c0cc5202 100644
--- a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
@@ -23,6 +23,7 @@ add_clang_library(clangTidyBugproneModule
ImplicitWideningOfMultiplicationResultCheck.cpp
InaccurateEraseCheck.cpp
IncorrectEnableIfCheck.cpp
+ MoveSharedPointerContentsCheck.cpp
SwitchMissingDefaultCaseCheck.cpp
IncDecInConditionsCheck.cpp
IncorrectRoundingsCheck.cpp
@@ -35,6 +36,7 @@ add_clang_library(clangTidyBugproneModule
MisplacedPointerArithmeticInAllocCheck.cpp
MisplacedWideningCastCheck.cpp
MoveForwardingReferenceCheck.cpp
+ MoveSharedPointerContentsCheck.cpp
MultiLevelImplicitPointerConversionCheck.cpp
MultipleNewInOneExpressionCheck.cpp
MultipleStatementMacroCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
new file mode 100644
index 00000000000000..b4a393b7f2f200
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
@@ -0,0 +1,60 @@
+//===--- MoveSharedPointerContentsCheck.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 "MoveSharedPointerContentsCheck.h"
+#include "../ClangTidyCheck.h"
+#include "../utils/Matchers.h"
+#include "../utils/OptionsUtils.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::bugprone {
+
+MoveSharedPointerContentsCheck::MoveSharedPointerContentsCheck(
+ StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context),
+ SharedPointerClasses(utils::options::parseStringList(
+ Options.get("SharedPointerClasses", "std::shared_ptr"))) {}
+
+MoveSharedPointerContentsCheck::~MoveSharedPointerContentsCheck() = default;
+
+bool MoveSharedPointerContentsCheck::isLanguageVersionSupported(
+ const LangOptions &LangOptions) const {
+ return LangOptions.CPlusPlus11;
+}
+
+void MoveSharedPointerContentsCheck::registerMatchers(MatchFinder *Finder) {
+ Finder->addMatcher(
+ callExpr(
+ callee(functionDecl(hasName("std::move"))),
+ hasArgument(0, cxxOperatorCallExpr(hasOverloadedOperatorName("*"),
+ callee(cxxMethodDecl(ofClass(
+ matchers::matchesAnyListedName(
+ SharedPointerClasses)))))
+ .bind("op")))
+ .bind("call"),
+ this);
+}
+
+void MoveSharedPointerContentsCheck::check(
+ const MatchFinder::MatchResult &Result) {
+ const auto *Call = Result.Nodes.getNodeAs<CallExpr>("call");
+ const auto *Op = Result.Nodes.getNodeAs<Expr>("op");
+
+ if (Op) {
+ diag(Call->getBeginLoc(),
+ "don't move the contents out of a shared pointer, as other accessors "
+ "expect them to remain in a determinate state")
+ << FixItHint::CreateInsertion(Call->getBeginLoc(), "*")
+ << FixItHint::CreateRemoval(Op->getBeginLoc());
+ }
+}
+
+} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
new file mode 100644
index 00000000000000..a9ae8d335941e8
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
@@ -0,0 +1,37 @@
+//===--- MoveSharedPointerContentsCheck.h - clang-tidy ----------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVESHAREDPOINTERCONTENTSCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVESHAREDPOINTERCONTENTSCHECK_H
+
+#include <vector>
+
+#include "../ClangTidyCheck.h"
+
+namespace clang::tidy::bugprone {
+
+/// FIXME: Write a short description.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/move-shared-pointer-contents.html
+class MoveSharedPointerContentsCheck : public ClangTidyCheck {
+public:
+ MoveSharedPointerContentsCheck(StringRef Name, ClangTidyContext *Context);
+ ~MoveSharedPointerContentsCheck() override;
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+ bool
+ isLanguageVersionSupported(const LangOptions &LangOptions) const override;
+
+private:
+ const std::vector<StringRef> SharedPointerClasses;
+};
+
+} // namespace clang::tidy::bugprone
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVESHAREDPOINTERCONTENTSCHECK_H
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 19c977977f9044..cbd472d86c4227 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -138,6 +138,12 @@ New checks
Detects incorrect usages of ``std::enable_if`` that don't name the nested
``type`` type.
+- New :doc:`bugprone-move-shared-pointer-contents
+ <clang-tidy/checks/bugprone/move-shared-pointer-contents>` check.
+
+ Detects calls to move the contents out of a ``std::shared_ptr`` rather than
+ moving the pointer itself.
+
- New :doc:`bugprone-multi-level-implicit-pointer-conversion
<clang-tidy/checks/bugprone/multi-level-implicit-pointer-conversion>` check.
diff --git a/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
new file mode 100644
index 00000000000000..4536663a1b7470
--- /dev/null
+++ b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
@@ -0,0 +1,17 @@
+.. title:: clang-tidy - bugprone-move-shared-pointer-contents
+
+bugprone-move-shared-pointer-contents
+=====================================
+
+Detects calls to move the contents out of a ``std::shared_ptr`` rather than
+moving the pointer itself. In other words, calling ``std::move(*p)``. Other
+reference holders may not be expecting the move and suddenly getting empty or
+otherwise indeterminate states can cause issues.
+
+Options
+-------
+
+.. option :: SharedPointerClasses
+
+ A semicolon-separated list of class names that should be treated as shared
+ pointers. By default only `std::shared_ptr` is included.
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index 75a86431d26441..bfe8b15ccc7ea3 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -105,6 +105,7 @@ Clang-Tidy Checks
:doc:`bugprone-misplaced-pointer-arithmetic-in-alloc <bugprone/misplaced-pointer-arithmetic-in-alloc>`, "Yes"
:doc:`bugprone-misplaced-widening-cast <bugprone/misplaced-widening-cast>`,
:doc:`bugprone-move-forwarding-reference <bugprone/move-forwarding-reference>`, "Yes"
+ :doc:`bugprone-move-shared-pointer-contents <bugprone/move-shared-pointer-contents>`, "Yes"
:doc:`bugprone-multi-level-implicit-pointer-conversion <bugprone/multi-level-implicit-pointer-conversion>`,
:doc:`bugprone-multiple-new-in-one-expression <bugprone/multiple-new-in-one-expression>`,
:doc:`bugprone-multiple-statement-macro <bugprone/multiple-statement-macro>`,
@@ -116,6 +117,7 @@ Clang-Tidy Checks
:doc:`bugprone-posix-return <bugprone/posix-return>`, "Yes"
:doc:`bugprone-redundant-branch-condition <bugprone/redundant-branch-condition>`, "Yes"
:doc:`bugprone-reserved-identifier <bugprone/reserved-identifier>`, "Yes"
+ :doc:`bugprone-shared-pointer-contents-move <bugprone/shared-pointer-contents-move>`, "Yes"
:doc:`bugprone-shared-ptr-array-mismatch <bugprone/shared-ptr-array-mismatch>`, "Yes"
:doc:`bugprone-signal-handler <bugprone/signal-handler>`,
:doc:`bugprone-signed-char-misuse <bugprone/signed-char-misuse>`,
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
new file mode 100644
index 00000000000000..0837708a7171c5
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
@@ -0,0 +1,68 @@
+// RUN: %check_clang_tidy %s bugprone-move-shared-pointer-contents %t -- -config="{CheckOptions: {bugprone-move-shared-pointer-contents.SharedPointerClasses: 'std::shared_ptr;my::OtherSharedPtr;'}}"
+
+// Some dummy definitions we'll need.
+
+namespace std {
+
+using size_t = int;
+
+template <typename> struct remove_reference;
+template <typename _Tp> struct remove_reference { typedef _Tp type; };
+template <typename _Tp> struct remove_reference<_Tp &> { typedef _Tp type; };
+template <typename _Tp> struct remove_reference<_Tp &&> { typedef _Tp type; };
+
+template <typename _Tp>
+constexpr typename std::remove_reference<_Tp>::type &&move(_Tp &&__t) {
+ return static_cast<typename std::remove_reference<_Tp>::type &&>(__t);
+}
+
+template <typename T>
+struct shared_ptr {
+ shared_ptr();
+ T *get() const;
+ explicit operator bool() const;
+ void reset(T *ptr);
+ T &operator*() const;
+ T *operator->() const;
+};
+
+} // namespace std
+
+namespace my {
+template <typename T>
+using OtherSharedPtr = std::shared_ptr<T>;
+} // namespace my
+
+void correct() {
+ std::shared_ptr<int> p;
+ int x = *std::move(p);
+}
+
+void simpleFinding() {
+ std::shared_ptr<int> p;
+ int y = std::move(*p);
+ // CHECK-FIXES: *std::move(p)
+}
+// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void aliasedType() {
+ using int_ptr = std::shared_ptr<int>;
+ int_ptr p;
+ int x = std::move(*p);
+ // CHECK-FIXES: *std::move(p)
+}
+// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void configWorks() {
+ my::OtherSharedPtr<int> p;
+ int x = std::move(*p);
+ // CHECK-FIXES: *std::move(p)
+}
+// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void multiStars() {
+ std::shared_ptr<int> p;
+ int x = 2 * std::move(*p) * 3;
+ // CHECK-FIXES: *std::move(p)
+}
+// CHECK-MESSAGES: :[[@LINE-3]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
>From 528146e8d1fae56d2d4cc2d32a0823aa1f9cbc2b Mon Sep 17 00:00:00 2001
From: David Pizzuto <pizzud at google.com>
Date: Tue, 26 Sep 2023 10:45:42 -0700
Subject: [PATCH 2/6] [clang-tidy] Add bugprone-move-shared-pointer-contents
check.
This check detects moves of the contents of a shared pointer rather than the
pointer itself. Other code with a reference to the shared pointer is probably
not expecting the move.
The set of shared pointer classes is configurable via options to allow individual
projects to cover additional types.
---
.../MoveSharedPointerContentsCheck.cpp | 19 +++++--------------
.../bugprone/MoveSharedPointerContentsCheck.h | 10 ++++++----
.../bugprone/move-shared-pointer-contents.rst | 2 +-
.../bugprone/move-shared-pointer-contents.cpp | 7 +++++++
4 files changed, 19 insertions(+), 19 deletions(-)
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
index b4a393b7f2f200..9730cf2f0603c7 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
@@ -23,13 +23,6 @@ MoveSharedPointerContentsCheck::MoveSharedPointerContentsCheck(
SharedPointerClasses(utils::options::parseStringList(
Options.get("SharedPointerClasses", "std::shared_ptr"))) {}
-MoveSharedPointerContentsCheck::~MoveSharedPointerContentsCheck() = default;
-
-bool MoveSharedPointerContentsCheck::isLanguageVersionSupported(
- const LangOptions &LangOptions) const {
- return LangOptions.CPlusPlus11;
-}
-
void MoveSharedPointerContentsCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
callExpr(
@@ -48,13 +41,11 @@ void MoveSharedPointerContentsCheck::check(
const auto *Call = Result.Nodes.getNodeAs<CallExpr>("call");
const auto *Op = Result.Nodes.getNodeAs<Expr>("op");
- if (Op) {
- diag(Call->getBeginLoc(),
- "don't move the contents out of a shared pointer, as other accessors "
- "expect them to remain in a determinate state")
- << FixItHint::CreateInsertion(Call->getBeginLoc(), "*")
- << FixItHint::CreateRemoval(Op->getBeginLoc());
- }
+ diag(Call->getBeginLoc(),
+ "don't move the contents out of a shared pointer, as other accessors "
+ "expect them to remain in a determinate state")
+ << FixItHint::CreateInsertion(Call->getBeginLoc(), "*")
+ << FixItHint::CreateRemoval(Op->getBeginLoc());
}
} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
index a9ae8d335941e8..71b826596f23cc 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
@@ -10,23 +10,25 @@
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVESHAREDPOINTERCONTENTSCHECK_H
#include <vector>
-
#include "../ClangTidyCheck.h"
+#include "llvm/ADT/StringRef.h"
namespace clang::tidy::bugprone {
-/// FIXME: Write a short description.
+/// Detects calls to move the contents out of a ``std::shared_ptr`` rather than
+/// moving the pointer itself. In other words, calling ``std::move(*p)``.
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/move-shared-pointer-contents.html
class MoveSharedPointerContentsCheck : public ClangTidyCheck {
public:
MoveSharedPointerContentsCheck(StringRef Name, ClangTidyContext *Context);
- ~MoveSharedPointerContentsCheck() override;
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
bool
- isLanguageVersionSupported(const LangOptions &LangOptions) const override;
+ isLanguageVersionSupported(const LangOptions &LangOptions) const override {
+ return LangOptions.CPlusPlus11;
+ }
private:
const std::vector<StringRef> SharedPointerClasses;
diff --git a/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
index 4536663a1b7470..bf7edcf74fbb61 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
@@ -14,4 +14,4 @@ Options
.. option :: SharedPointerClasses
A semicolon-separated list of class names that should be treated as shared
- pointers. By default only `std::shared_ptr` is included.
+ pointers. Default is `std::shared_ptr`.
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
index 0837708a7171c5..5f1980213c6be0 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
@@ -66,3 +66,10 @@ void multiStars() {
// CHECK-FIXES: *std::move(p)
}
// CHECK-MESSAGES: :[[@LINE-3]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+// This case should be caught, but isn't.
+template <typename T>
+void unresolved() {
+ std::shared_ptr<T> p;
+ T x = 2 * std::move(*p) * 3;
+}
>From 415e5518119537ee820485fdf7353e7265644758 Mon Sep 17 00:00:00 2001
From: David Pizzuto <pizzud at google.com>
Date: Tue, 26 Sep 2023 10:45:42 -0700
Subject: [PATCH 3/6] [clang-tidy] Add bugprone-move-shared-pointer-contents
check.
This check detects moves of the contents of a shared pointer rather than the
pointer itself. Other code with a reference to the shared pointer is probably
not expecting the move.
The set of shared pointer classes is configurable via options to allow individual
projects to cover additional types.
---
.../clang-tidy/bugprone/MoveSharedPointerContentsCheck.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
index 71b826596f23cc..681dfe7f4202b9 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
@@ -9,9 +9,9 @@
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVESHAREDPOINTERCONTENTSCHECK_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVESHAREDPOINTERCONTENTSCHECK_H
-#include <vector>
#include "../ClangTidyCheck.h"
#include "llvm/ADT/StringRef.h"
+#include <vector>
namespace clang::tidy::bugprone {
>From 2d0fd03b76a7b86925526dc802d955e70993624b Mon Sep 17 00:00:00 2001
From: David Pizzuto <pizzud at google.com>
Date: Tue, 26 Sep 2023 10:45:42 -0700
Subject: [PATCH 4/6] [clang-tidy] Add bugprone-move-shared-pointer-contents
check.
This check detects moves of the contents of a shared pointer rather than the
pointer itself. Other code with a reference to the shared pointer is probably
not expecting the move.
The set of shared pointer classes is configurable via options to allow individual
projects to cover additional types.
---
.../clang-tidy/bugprone/CMakeLists.txt | 1 -
.../MoveSharedPointerContentsCheck.cpp | 24 ++++----
.../bugprone/MoveSharedPointerContentsCheck.h | 3 +
.../docs/clang-tidy/checks/list.rst | 3 +-
.../bugprone/move-shared-pointer-contents.cpp | 55 ++++++++++++-------
5 files changed, 49 insertions(+), 37 deletions(-)
diff --git a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
index e92b03ddfa883e..10be385a8de09c 100644
--- a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
@@ -25,7 +25,6 @@ add_clang_library(clangTidyBugproneModule
ImplicitWideningOfMultiplicationResultCheck.cpp
InaccurateEraseCheck.cpp
IncorrectEnableIfCheck.cpp
- MoveSharedPointerContentsCheck.cpp
SwitchMissingDefaultCaseCheck.cpp
IncDecInConditionsCheck.cpp
IncorrectRoundingsCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
index 9730cf2f0603c7..92882885961f17 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
@@ -21,17 +21,19 @@ MoveSharedPointerContentsCheck::MoveSharedPointerContentsCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
SharedPointerClasses(utils::options::parseStringList(
- Options.get("SharedPointerClasses", "std::shared_ptr"))) {}
+ Options.get("SharedPointerClasses", "::std::shared_ptr"))) {}
void MoveSharedPointerContentsCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
- callExpr(
- callee(functionDecl(hasName("std::move"))),
- hasArgument(0, cxxOperatorCallExpr(hasOverloadedOperatorName("*"),
- callee(cxxMethodDecl(ofClass(
- matchers::matchesAnyListedName(
- SharedPointerClasses)))))
- .bind("op")))
+ callExpr(anyOf(callee(functionDecl(hasName("::std::move"))),
+ callee(unresolvedLookupExpr(hasAnyDeclaration(namedDecl(
+ hasUnderlyingDecl(hasName("::std::move"))))))),
+ hasArgument(0, anyOf(cxxOperatorCallExpr(
+ hasOverloadedOperatorName("*"),
+ callee(cxxMethodDecl(ofClass(
+ matchers::matchesAnyListedName(
+ SharedPointerClasses))))),
+ unaryOperator(hasOperatorName("*")))))
.bind("call"),
this);
}
@@ -39,13 +41,9 @@ void MoveSharedPointerContentsCheck::registerMatchers(MatchFinder *Finder) {
void MoveSharedPointerContentsCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *Call = Result.Nodes.getNodeAs<CallExpr>("call");
- const auto *Op = Result.Nodes.getNodeAs<Expr>("op");
-
diag(Call->getBeginLoc(),
"don't move the contents out of a shared pointer, as other accessors "
- "expect them to remain in a determinate state")
- << FixItHint::CreateInsertion(Call->getBeginLoc(), "*")
- << FixItHint::CreateRemoval(Op->getBeginLoc());
+ "expect them to remain in a determinate state");
}
} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
index 681dfe7f4202b9..88fc860b25c459 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
@@ -29,6 +29,9 @@ class MoveSharedPointerContentsCheck : public ClangTidyCheck {
isLanguageVersionSupported(const LangOptions &LangOptions) const override {
return LangOptions.CPlusPlus11;
}
+ std::optional<TraversalKind> getCheckTraversalKind() const override {
+ return TK_AsIs;
+ }
private:
const std::vector<StringRef> SharedPointerClasses;
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index aaafa89cdbd594..5ea59b226fb329 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -107,7 +107,7 @@ Clang-Tidy Checks
:doc:`bugprone-misplaced-pointer-arithmetic-in-alloc <bugprone/misplaced-pointer-arithmetic-in-alloc>`, "Yes"
:doc:`bugprone-misplaced-widening-cast <bugprone/misplaced-widening-cast>`,
:doc:`bugprone-move-forwarding-reference <bugprone/move-forwarding-reference>`, "Yes"
- :doc:`bugprone-move-shared-pointer-contents <bugprone/move-shared-pointer-contents>`, "Yes"
+ :doc:`bugprone-move-shared-pointer-contents <bugprone/move-shared-pointer-contents>`,
:doc:`bugprone-multi-level-implicit-pointer-conversion <bugprone/multi-level-implicit-pointer-conversion>`,
:doc:`bugprone-multiple-new-in-one-expression <bugprone/multiple-new-in-one-expression>`,
:doc:`bugprone-multiple-statement-macro <bugprone/multiple-statement-macro>`,
@@ -119,7 +119,6 @@ Clang-Tidy Checks
:doc:`bugprone-posix-return <bugprone/posix-return>`, "Yes"
:doc:`bugprone-redundant-branch-condition <bugprone/redundant-branch-condition>`, "Yes"
:doc:`bugprone-reserved-identifier <bugprone/reserved-identifier>`, "Yes"
- :doc:`bugprone-shared-pointer-contents-move <bugprone/shared-pointer-contents-move>`, "Yes"
:doc:`bugprone-shared-ptr-array-mismatch <bugprone/shared-ptr-array-mismatch>`, "Yes"
:doc:`bugprone-signal-handler <bugprone/signal-handler>`,
:doc:`bugprone-signed-char-misuse <bugprone/signed-char-misuse>`,
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
index 5f1980213c6be0..1ad7bfe7105160 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
@@ -33,43 +33,56 @@ template <typename T>
using OtherSharedPtr = std::shared_ptr<T>;
} // namespace my
+struct Nontrivial {
+ int x;
+ Nontrivial() : x(2) {}
+ Nontrivial(Nontrivial& other) { x = other.x; }
+ Nontrivial(Nontrivial&& other) { x = std::move(other.x); }
+ Nontrivial& operator=(Nontrivial& other) { x = other.x; }
+ Nontrivial& operator=(Nontrivial&& other) { x = std::move(other.x); }
+};
+
+// Test cases begin here.
+
void correct() {
- std::shared_ptr<int> p;
- int x = *std::move(p);
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial x = *std::move(p);
}
void simpleFinding() {
- std::shared_ptr<int> p;
- int y = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial y = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void aliasedType() {
- using int_ptr = std::shared_ptr<int>;
- int_ptr p;
- int x = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ using nontrivial_ptr = std::shared_ptr<Nontrivial>;
+ nontrivial_ptr p;
+ Nontrivial x = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void configWorks() {
- my::OtherSharedPtr<int> p;
- int x = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ my::OtherSharedPtr<Nontrivial> p;
+ Nontrivial x = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void multiStars() {
- std::shared_ptr<int> p;
- int x = 2 * std::move(*p) * 3;
- // CHECK-FIXES: *std::move(p)
+ std::shared_ptr<Nontrivial> p;
+ int x = 2 * std::move(*p).x * 3;
}
-// CHECK-MESSAGES: :[[@LINE-3]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
-// This case should be caught, but isn't.
template <typename T>
void unresolved() {
std::shared_ptr<T> p;
- T x = 2 * std::move(*p) * 3;
+ int x = 2 * std::move(*p).x * 3;
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void dereferencedGet() {
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial x = std::move(*p.get());
}
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
>From ca778d6ee12ad12e2095934ddf46a9c606b33b2c Mon Sep 17 00:00:00 2001
From: David Pizzuto <pizzud at google.com>
Date: Tue, 26 Sep 2023 10:45:42 -0700
Subject: [PATCH 5/6] [clang-tidy] Add bugprone-move-shared-pointer-contents
check.
This check detects moves of the contents of a shared pointer rather than the
pointer itself. Other code with a reference to the shared pointer is probably
not expecting the move.
The set of shared pointer classes is configurable via options to allow individual
projects to cover additional types.
---
.../clang-tidy/bugprone/CMakeLists.txt | 1 -
.../MoveSharedPointerContentsCheck.cpp | 130 ++++++++++++++++--
.../bugprone/MoveSharedPointerContentsCheck.h | 7 +
.../bugprone/move-shared-pointer-contents.rst | 12 +-
.../docs/clang-tidy/checks/list.rst | 3 +-
.../bugprone/move-shared-pointer-contents.cpp | 93 ++++++++++---
6 files changed, 204 insertions(+), 42 deletions(-)
diff --git a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
index e92b03ddfa883e..10be385a8de09c 100644
--- a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
@@ -25,7 +25,6 @@ add_clang_library(clangTidyBugproneModule
ImplicitWideningOfMultiplicationResultCheck.cpp
InaccurateEraseCheck.cpp
IncorrectEnableIfCheck.cpp
- MoveSharedPointerContentsCheck.cpp
SwitchMissingDefaultCaseCheck.cpp
IncDecInConditionsCheck.cpp
IncorrectRoundingsCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
index 9730cf2f0603c7..ae3944ba5d26df 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
@@ -21,31 +21,137 @@ MoveSharedPointerContentsCheck::MoveSharedPointerContentsCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
SharedPointerClasses(utils::options::parseStringList(
- Options.get("SharedPointerClasses", "std::shared_ptr"))) {}
+ Options.get("SharedPointerClasses", "::std::shared_ptr"))) {}
void MoveSharedPointerContentsCheck::registerMatchers(MatchFinder *Finder) {
+ auto isStdMove = callee(functionDecl(hasName("::std::move")));
+
+ // Resolved type, direct move.
Finder->addMatcher(
- callExpr(
- callee(functionDecl(hasName("std::move"))),
- hasArgument(0, cxxOperatorCallExpr(hasOverloadedOperatorName("*"),
+ callExpr(isStdMove, hasArgument(0, cxxOperatorCallExpr(
+ hasOverloadedOperatorName("*"),
callee(cxxMethodDecl(ofClass(
matchers::matchesAnyListedName(
- SharedPointerClasses)))))
- .bind("op")))
+ SharedPointerClasses)))))))
.bind("call"),
this);
+
+ // Resolved type, move out of get().
+ Finder->addMatcher(
+ callExpr(
+ isStdMove,
+ hasArgument(
+ 0, unaryOperator(
+ hasOperatorName("*"),
+ hasUnaryOperand(cxxMemberCallExpr(callee(cxxMethodDecl(
+ hasName("get"), ofClass(matchers::matchesAnyListedName(
+ SharedPointerClasses)))))))))
+ .bind("get_call"),
+ this);
+
+ auto isStdMoveUnresolved = callee(unresolvedLookupExpr(
+ hasAnyDeclaration(namedDecl(hasUnderlyingDecl(hasName("::std::move"))))));
+
+ // Unresolved type, direct move.
+ Finder->addMatcher(
+ callExpr(
+ isStdMoveUnresolved,
+ hasArgument(0, unaryOperator(hasOperatorName("*"),
+ hasUnaryOperand(declRefExpr(hasType(
+ qualType().bind("unresolved_p")))))))
+ .bind("unresolved_call"),
+ this);
+ // Annoyingly, the declRefExpr in the unresolved-move-of-get() case
+ // is of <dependent type> rather than shared_ptr<T>, so we have to
+ // just fetch the variable. This does leave a gap where a temporary
+ // shared_ptr wouldn't be caught, but moving out of a temporary
+ // shared pointer is a truly wild thing to do so it should be okay.
+
+ // Unresolved type, move out of get().
+ Finder->addMatcher(
+ callExpr(isStdMoveUnresolved,
+ hasArgument(
+ 0, unaryOperator(hasOperatorName("*"),
+ hasDescendant(cxxDependentScopeMemberExpr(
+ hasMemberName("get"))),
+ hasDescendant(declRefExpr(to(
+ varDecl().bind("unresolved_get_p")))))))
+ .bind("unresolved_get_call"),
+ this);
+}
+
+bool MoveSharedPointerContentsCheck::isSharedPointerClass(
+ const VarDecl *VD) const {
+ if (VD == nullptr) {
+ return false;
+ }
+
+ const QualType QT = VD->getType();
+ return isSharedPointerClass(&QT);
+}
+
+bool MoveSharedPointerContentsCheck::isSharedPointerClass(
+ const QualType *QT) const {
+ if (QT == nullptr) {
+ return false;
+ }
+ // We want the qualified name without template parameters,
+ // const/volatile, or reference/pointer qualifiers so we can look
+ // it up in SharedPointerClasses. This is a bit messy, but gets us
+ // to the underlying type without template parameters (eg
+ // std::shared_ptr) or const/volatile qualifiers even in the face of
+ // typedefs.
+
+ bool found = false;
+ auto *Template = llvm::dyn_cast<TemplateSpecializationType>(
+ QT->getSplitDesugaredType().Ty);
+ if (Template != nullptr) {
+ const std::string TypeName = Template->getTemplateName()
+ .getAsTemplateDecl()
+ ->getQualifiedNameAsString();
+ for (const llvm::StringRef SharedPointer : SharedPointerClasses) {
+ // SharedPointer entries may or may not have leading ::, but TypeName
+ // definitely won't.
+ if (SharedPointer == TypeName || SharedPointer.substr(2) == TypeName) {
+ found = true;
+ break;
+ }
+ }
+ }
+
+ return found;
}
void MoveSharedPointerContentsCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *Call = Result.Nodes.getNodeAs<CallExpr>("call");
- const auto *Op = Result.Nodes.getNodeAs<Expr>("op");
+ const auto *GetCall = Result.Nodes.getNodeAs<CallExpr>("get_call");
+ const auto *UnresolvedCall =
+ Result.Nodes.getNodeAs<CallExpr>("unresolved_call");
+ const auto *UnresolvedPtr = Result.Nodes.getNodeAs<QualType>("unresolved_p");
+ const auto *UnresolvedGetCall =
+ Result.Nodes.getNodeAs<CallExpr>("unresolved_get_call");
+ const auto *UnresolvedGetPtr =
+ Result.Nodes.getNodeAs<VarDecl>("unresolved_get_p");
+
+ const bool Unresolved = isSharedPointerClass(UnresolvedPtr);
+ const bool UnresolvedGet = isSharedPointerClass(UnresolvedGetPtr);
- diag(Call->getBeginLoc(),
- "don't move the contents out of a shared pointer, as other accessors "
- "expect them to remain in a determinate state")
- << FixItHint::CreateInsertion(Call->getBeginLoc(), "*")
- << FixItHint::CreateRemoval(Op->getBeginLoc());
+ clang::SourceLocation Loc;
+ if (Unresolved) {
+ Loc = UnresolvedCall->getBeginLoc();
+ } else if (UnresolvedGet) {
+ Loc = UnresolvedGetCall->getBeginLoc();
+ } else if (GetCall != nullptr) {
+ Loc = GetCall->getBeginLoc();
+ } else if (Call != nullptr) {
+ Loc = Call->getBeginLoc();
+ }
+ if (Loc.isValid()) {
+ diag(Loc,
+ "don't move the contents out of a shared pointer, as other accessors "
+ "expect them to remain in a determinate state");
+ }
}
} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
index 681dfe7f4202b9..46cf31f53d315f 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
@@ -29,8 +29,15 @@ class MoveSharedPointerContentsCheck : public ClangTidyCheck {
isLanguageVersionSupported(const LangOptions &LangOptions) const override {
return LangOptions.CPlusPlus11;
}
+ std::optional<TraversalKind> getCheckTraversalKind() const override {
+ return TK_IgnoreUnlessSpelledInSource;
+ }
private:
+ // Returns whether the type or variable is one of the SharedPointerClasses.
+ bool isSharedPointerClass(const QualType *QT) const;
+ bool isSharedPointerClass(const VarDecl *VD) const;
+
const std::vector<StringRef> SharedPointerClasses;
};
diff --git a/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
index bf7edcf74fbb61..53cd861557e21c 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
@@ -3,10 +3,11 @@
bugprone-move-shared-pointer-contents
=====================================
-Detects calls to move the contents out of a ``std::shared_ptr`` rather than
-moving the pointer itself. In other words, calling ``std::move(*p)``. Other
-reference holders may not be expecting the move and suddenly getting empty or
-otherwise indeterminate states can cause issues.
+Detects calls to move the contents out of a ``std::shared_ptr`` rather
+than moving the pointer itself. In other words, calling
+``std::move(*p)`` or ``std::move(*p.get())``. Other reference holders
+may not be expecting the move and suddenly getting empty or otherwise
+indeterminate states can cause issues.
Options
-------
@@ -14,4 +15,5 @@ Options
.. option :: SharedPointerClasses
A semicolon-separated list of class names that should be treated as shared
- pointers. Default is `std::shared_ptr`.
+ pointers. Classes are resolved through aliases, so any alias to the defined
+ classes will be considered. Default is `std::shared_ptr`.
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index aaafa89cdbd594..5ea59b226fb329 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -107,7 +107,7 @@ Clang-Tidy Checks
:doc:`bugprone-misplaced-pointer-arithmetic-in-alloc <bugprone/misplaced-pointer-arithmetic-in-alloc>`, "Yes"
:doc:`bugprone-misplaced-widening-cast <bugprone/misplaced-widening-cast>`,
:doc:`bugprone-move-forwarding-reference <bugprone/move-forwarding-reference>`, "Yes"
- :doc:`bugprone-move-shared-pointer-contents <bugprone/move-shared-pointer-contents>`, "Yes"
+ :doc:`bugprone-move-shared-pointer-contents <bugprone/move-shared-pointer-contents>`,
:doc:`bugprone-multi-level-implicit-pointer-conversion <bugprone/multi-level-implicit-pointer-conversion>`,
:doc:`bugprone-multiple-new-in-one-expression <bugprone/multiple-new-in-one-expression>`,
:doc:`bugprone-multiple-statement-macro <bugprone/multiple-statement-macro>`,
@@ -119,7 +119,6 @@ Clang-Tidy Checks
:doc:`bugprone-posix-return <bugprone/posix-return>`, "Yes"
:doc:`bugprone-redundant-branch-condition <bugprone/redundant-branch-condition>`, "Yes"
:doc:`bugprone-reserved-identifier <bugprone/reserved-identifier>`, "Yes"
- :doc:`bugprone-shared-pointer-contents-move <bugprone/shared-pointer-contents-move>`, "Yes"
:doc:`bugprone-shared-ptr-array-mismatch <bugprone/shared-ptr-array-mismatch>`, "Yes"
:doc:`bugprone-signal-handler <bugprone/signal-handler>`,
:doc:`bugprone-signed-char-misuse <bugprone/signed-char-misuse>`,
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
index 5f1980213c6be0..d4cc75cdc2f939 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
@@ -1,4 +1,4 @@
-// RUN: %check_clang_tidy %s bugprone-move-shared-pointer-contents %t -- -config="{CheckOptions: {bugprone-move-shared-pointer-contents.SharedPointerClasses: 'std::shared_ptr;my::OtherSharedPtr;'}}"
+// RUN: %check_clang_tidy %s bugprone-move-shared-pointer-contents %t -- -config="{CheckOptions: {bugprone-move-shared-pointer-contents.SharedPointerClasses: '::std::shared_ptr;my::OtherSharedPtr;'}}"
// Some dummy definitions we'll need.
@@ -31,45 +31,94 @@ struct shared_ptr {
namespace my {
template <typename T>
using OtherSharedPtr = std::shared_ptr<T>;
+// Not part of the config.
+template <typename T>
+using YetAnotherSharedPtr = T*;
} // namespace my
+struct Nontrivial {
+ int x;
+ Nontrivial() : x(2) {}
+ Nontrivial(Nontrivial& other) { x = other.x; }
+ Nontrivial(Nontrivial&& other) { x = std::move(other.x); }
+ Nontrivial& operator=(Nontrivial& other) { x = other.x; }
+ Nontrivial& operator=(Nontrivial&& other) { x = std::move(other.x); }
+};
+
+// Test cases begin here.
+
void correct() {
- std::shared_ptr<int> p;
- int x = *std::move(p);
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial x = *std::move(p);
}
void simpleFinding() {
- std::shared_ptr<int> p;
- int y = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial y = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void aliasedType() {
- using int_ptr = std::shared_ptr<int>;
- int_ptr p;
- int x = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ using nontrivial_ptr = std::shared_ptr<Nontrivial>;
+ nontrivial_ptr p;
+ Nontrivial x = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void configWorks() {
- my::OtherSharedPtr<int> p;
- int x = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ my::OtherSharedPtr<Nontrivial> p;
+ Nontrivial x = std::move(*p);
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void sharedEsquePointerNotInConfig() {
+ my::YetAnotherSharedPtr<Nontrivial> p;
+ Nontrivial x = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void multiStars() {
- std::shared_ptr<int> p;
- int x = 2 * std::move(*p) * 3;
- // CHECK-FIXES: *std::move(p)
+ std::shared_ptr<Nontrivial> p;
+ int x = 2 * std::move(*p).x * 3;
}
-// CHECK-MESSAGES: :[[@LINE-3]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
-// This case should be caught, but isn't.
template <typename T>
void unresolved() {
std::shared_ptr<T> p;
- T x = 2 * std::move(*p) * 3;
+ int x = 2 * std::move(*p).x * 3;
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void unresolvedAsAReference() {
+ std::shared_ptr<T> p;
+ std::shared_ptr<T>& q = p;
+ int x = 2 * std::move(*q).x * 3;
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void unresolvedAlias() {
+ my::OtherSharedPtr<T> p;
+ Nontrivial x = std::move(*p);
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void dereferencedGet() {
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial x = std::move(*p.get());
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void unresolvedDereferencedGet() {
+ std::shared_ptr<T> p;
+ T x = std::move(*p.get());
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:9: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void rawPointer() {
+ T* p;
+ T x = std::move(*p);
}
>From 173717103dd28d94f88d10432804b19ee118e46e Mon Sep 17 00:00:00 2001
From: David Pizzuto <pizzud at google.com>
Date: Tue, 26 Sep 2023 10:45:42 -0700
Subject: [PATCH 6/6] [clang-tidy] Add bugprone-move-shared-pointer-contents
check.
This check detects moves of the contents of a shared pointer rather than the
pointer itself. Other code with a reference to the shared pointer is probably
not expecting the move.
The set of shared pointer classes is configurable via options to allow individual
projects to cover additional types.
---
.../clang-tidy/bugprone/CMakeLists.txt | 1 -
.../MoveSharedPointerContentsCheck.cpp | 130 ++++++++++++++++--
.../bugprone/MoveSharedPointerContentsCheck.h | 7 +
.../bugprone/move-shared-pointer-contents.rst | 12 +-
.../docs/clang-tidy/checks/list.rst | 3 +-
.../bugprone/move-shared-pointer-contents.cpp | 93 ++++++++++---
6 files changed, 204 insertions(+), 42 deletions(-)
diff --git a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
index e92b03ddfa883e..10be385a8de09c 100644
--- a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
@@ -25,7 +25,6 @@ add_clang_library(clangTidyBugproneModule
ImplicitWideningOfMultiplicationResultCheck.cpp
InaccurateEraseCheck.cpp
IncorrectEnableIfCheck.cpp
- MoveSharedPointerContentsCheck.cpp
SwitchMissingDefaultCaseCheck.cpp
IncDecInConditionsCheck.cpp
IncorrectRoundingsCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
index 9730cf2f0603c7..ae3944ba5d26df 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.cpp
@@ -21,31 +21,137 @@ MoveSharedPointerContentsCheck::MoveSharedPointerContentsCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
SharedPointerClasses(utils::options::parseStringList(
- Options.get("SharedPointerClasses", "std::shared_ptr"))) {}
+ Options.get("SharedPointerClasses", "::std::shared_ptr"))) {}
void MoveSharedPointerContentsCheck::registerMatchers(MatchFinder *Finder) {
+ auto isStdMove = callee(functionDecl(hasName("::std::move")));
+
+ // Resolved type, direct move.
Finder->addMatcher(
- callExpr(
- callee(functionDecl(hasName("std::move"))),
- hasArgument(0, cxxOperatorCallExpr(hasOverloadedOperatorName("*"),
+ callExpr(isStdMove, hasArgument(0, cxxOperatorCallExpr(
+ hasOverloadedOperatorName("*"),
callee(cxxMethodDecl(ofClass(
matchers::matchesAnyListedName(
- SharedPointerClasses)))))
- .bind("op")))
+ SharedPointerClasses)))))))
.bind("call"),
this);
+
+ // Resolved type, move out of get().
+ Finder->addMatcher(
+ callExpr(
+ isStdMove,
+ hasArgument(
+ 0, unaryOperator(
+ hasOperatorName("*"),
+ hasUnaryOperand(cxxMemberCallExpr(callee(cxxMethodDecl(
+ hasName("get"), ofClass(matchers::matchesAnyListedName(
+ SharedPointerClasses)))))))))
+ .bind("get_call"),
+ this);
+
+ auto isStdMoveUnresolved = callee(unresolvedLookupExpr(
+ hasAnyDeclaration(namedDecl(hasUnderlyingDecl(hasName("::std::move"))))));
+
+ // Unresolved type, direct move.
+ Finder->addMatcher(
+ callExpr(
+ isStdMoveUnresolved,
+ hasArgument(0, unaryOperator(hasOperatorName("*"),
+ hasUnaryOperand(declRefExpr(hasType(
+ qualType().bind("unresolved_p")))))))
+ .bind("unresolved_call"),
+ this);
+ // Annoyingly, the declRefExpr in the unresolved-move-of-get() case
+ // is of <dependent type> rather than shared_ptr<T>, so we have to
+ // just fetch the variable. This does leave a gap where a temporary
+ // shared_ptr wouldn't be caught, but moving out of a temporary
+ // shared pointer is a truly wild thing to do so it should be okay.
+
+ // Unresolved type, move out of get().
+ Finder->addMatcher(
+ callExpr(isStdMoveUnresolved,
+ hasArgument(
+ 0, unaryOperator(hasOperatorName("*"),
+ hasDescendant(cxxDependentScopeMemberExpr(
+ hasMemberName("get"))),
+ hasDescendant(declRefExpr(to(
+ varDecl().bind("unresolved_get_p")))))))
+ .bind("unresolved_get_call"),
+ this);
+}
+
+bool MoveSharedPointerContentsCheck::isSharedPointerClass(
+ const VarDecl *VD) const {
+ if (VD == nullptr) {
+ return false;
+ }
+
+ const QualType QT = VD->getType();
+ return isSharedPointerClass(&QT);
+}
+
+bool MoveSharedPointerContentsCheck::isSharedPointerClass(
+ const QualType *QT) const {
+ if (QT == nullptr) {
+ return false;
+ }
+ // We want the qualified name without template parameters,
+ // const/volatile, or reference/pointer qualifiers so we can look
+ // it up in SharedPointerClasses. This is a bit messy, but gets us
+ // to the underlying type without template parameters (eg
+ // std::shared_ptr) or const/volatile qualifiers even in the face of
+ // typedefs.
+
+ bool found = false;
+ auto *Template = llvm::dyn_cast<TemplateSpecializationType>(
+ QT->getSplitDesugaredType().Ty);
+ if (Template != nullptr) {
+ const std::string TypeName = Template->getTemplateName()
+ .getAsTemplateDecl()
+ ->getQualifiedNameAsString();
+ for (const llvm::StringRef SharedPointer : SharedPointerClasses) {
+ // SharedPointer entries may or may not have leading ::, but TypeName
+ // definitely won't.
+ if (SharedPointer == TypeName || SharedPointer.substr(2) == TypeName) {
+ found = true;
+ break;
+ }
+ }
+ }
+
+ return found;
}
void MoveSharedPointerContentsCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *Call = Result.Nodes.getNodeAs<CallExpr>("call");
- const auto *Op = Result.Nodes.getNodeAs<Expr>("op");
+ const auto *GetCall = Result.Nodes.getNodeAs<CallExpr>("get_call");
+ const auto *UnresolvedCall =
+ Result.Nodes.getNodeAs<CallExpr>("unresolved_call");
+ const auto *UnresolvedPtr = Result.Nodes.getNodeAs<QualType>("unresolved_p");
+ const auto *UnresolvedGetCall =
+ Result.Nodes.getNodeAs<CallExpr>("unresolved_get_call");
+ const auto *UnresolvedGetPtr =
+ Result.Nodes.getNodeAs<VarDecl>("unresolved_get_p");
+
+ const bool Unresolved = isSharedPointerClass(UnresolvedPtr);
+ const bool UnresolvedGet = isSharedPointerClass(UnresolvedGetPtr);
- diag(Call->getBeginLoc(),
- "don't move the contents out of a shared pointer, as other accessors "
- "expect them to remain in a determinate state")
- << FixItHint::CreateInsertion(Call->getBeginLoc(), "*")
- << FixItHint::CreateRemoval(Op->getBeginLoc());
+ clang::SourceLocation Loc;
+ if (Unresolved) {
+ Loc = UnresolvedCall->getBeginLoc();
+ } else if (UnresolvedGet) {
+ Loc = UnresolvedGetCall->getBeginLoc();
+ } else if (GetCall != nullptr) {
+ Loc = GetCall->getBeginLoc();
+ } else if (Call != nullptr) {
+ Loc = Call->getBeginLoc();
+ }
+ if (Loc.isValid()) {
+ diag(Loc,
+ "don't move the contents out of a shared pointer, as other accessors "
+ "expect them to remain in a determinate state");
+ }
}
} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
index 681dfe7f4202b9..46cf31f53d315f 100644
--- a/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveSharedPointerContentsCheck.h
@@ -29,8 +29,15 @@ class MoveSharedPointerContentsCheck : public ClangTidyCheck {
isLanguageVersionSupported(const LangOptions &LangOptions) const override {
return LangOptions.CPlusPlus11;
}
+ std::optional<TraversalKind> getCheckTraversalKind() const override {
+ return TK_IgnoreUnlessSpelledInSource;
+ }
private:
+ // Returns whether the type or variable is one of the SharedPointerClasses.
+ bool isSharedPointerClass(const QualType *QT) const;
+ bool isSharedPointerClass(const VarDecl *VD) const;
+
const std::vector<StringRef> SharedPointerClasses;
};
diff --git a/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
index bf7edcf74fbb61..53cd861557e21c 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/bugprone/move-shared-pointer-contents.rst
@@ -3,10 +3,11 @@
bugprone-move-shared-pointer-contents
=====================================
-Detects calls to move the contents out of a ``std::shared_ptr`` rather than
-moving the pointer itself. In other words, calling ``std::move(*p)``. Other
-reference holders may not be expecting the move and suddenly getting empty or
-otherwise indeterminate states can cause issues.
+Detects calls to move the contents out of a ``std::shared_ptr`` rather
+than moving the pointer itself. In other words, calling
+``std::move(*p)`` or ``std::move(*p.get())``. Other reference holders
+may not be expecting the move and suddenly getting empty or otherwise
+indeterminate states can cause issues.
Options
-------
@@ -14,4 +15,5 @@ Options
.. option :: SharedPointerClasses
A semicolon-separated list of class names that should be treated as shared
- pointers. Default is `std::shared_ptr`.
+ pointers. Classes are resolved through aliases, so any alias to the defined
+ classes will be considered. Default is `std::shared_ptr`.
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index aaafa89cdbd594..5ea59b226fb329 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -107,7 +107,7 @@ Clang-Tidy Checks
:doc:`bugprone-misplaced-pointer-arithmetic-in-alloc <bugprone/misplaced-pointer-arithmetic-in-alloc>`, "Yes"
:doc:`bugprone-misplaced-widening-cast <bugprone/misplaced-widening-cast>`,
:doc:`bugprone-move-forwarding-reference <bugprone/move-forwarding-reference>`, "Yes"
- :doc:`bugprone-move-shared-pointer-contents <bugprone/move-shared-pointer-contents>`, "Yes"
+ :doc:`bugprone-move-shared-pointer-contents <bugprone/move-shared-pointer-contents>`,
:doc:`bugprone-multi-level-implicit-pointer-conversion <bugprone/multi-level-implicit-pointer-conversion>`,
:doc:`bugprone-multiple-new-in-one-expression <bugprone/multiple-new-in-one-expression>`,
:doc:`bugprone-multiple-statement-macro <bugprone/multiple-statement-macro>`,
@@ -119,7 +119,6 @@ Clang-Tidy Checks
:doc:`bugprone-posix-return <bugprone/posix-return>`, "Yes"
:doc:`bugprone-redundant-branch-condition <bugprone/redundant-branch-condition>`, "Yes"
:doc:`bugprone-reserved-identifier <bugprone/reserved-identifier>`, "Yes"
- :doc:`bugprone-shared-pointer-contents-move <bugprone/shared-pointer-contents-move>`, "Yes"
:doc:`bugprone-shared-ptr-array-mismatch <bugprone/shared-ptr-array-mismatch>`, "Yes"
:doc:`bugprone-signal-handler <bugprone/signal-handler>`,
:doc:`bugprone-signed-char-misuse <bugprone/signed-char-misuse>`,
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
index 5f1980213c6be0..d4cc75cdc2f939 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/move-shared-pointer-contents.cpp
@@ -1,4 +1,4 @@
-// RUN: %check_clang_tidy %s bugprone-move-shared-pointer-contents %t -- -config="{CheckOptions: {bugprone-move-shared-pointer-contents.SharedPointerClasses: 'std::shared_ptr;my::OtherSharedPtr;'}}"
+// RUN: %check_clang_tidy %s bugprone-move-shared-pointer-contents %t -- -config="{CheckOptions: {bugprone-move-shared-pointer-contents.SharedPointerClasses: '::std::shared_ptr;my::OtherSharedPtr;'}}"
// Some dummy definitions we'll need.
@@ -31,45 +31,94 @@ struct shared_ptr {
namespace my {
template <typename T>
using OtherSharedPtr = std::shared_ptr<T>;
+// Not part of the config.
+template <typename T>
+using YetAnotherSharedPtr = T*;
} // namespace my
+struct Nontrivial {
+ int x;
+ Nontrivial() : x(2) {}
+ Nontrivial(Nontrivial& other) { x = other.x; }
+ Nontrivial(Nontrivial&& other) { x = std::move(other.x); }
+ Nontrivial& operator=(Nontrivial& other) { x = other.x; }
+ Nontrivial& operator=(Nontrivial&& other) { x = std::move(other.x); }
+};
+
+// Test cases begin here.
+
void correct() {
- std::shared_ptr<int> p;
- int x = *std::move(p);
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial x = *std::move(p);
}
void simpleFinding() {
- std::shared_ptr<int> p;
- int y = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial y = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void aliasedType() {
- using int_ptr = std::shared_ptr<int>;
- int_ptr p;
- int x = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ using nontrivial_ptr = std::shared_ptr<Nontrivial>;
+ nontrivial_ptr p;
+ Nontrivial x = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void configWorks() {
- my::OtherSharedPtr<int> p;
- int x = std::move(*p);
- // CHECK-FIXES: *std::move(p)
+ my::OtherSharedPtr<Nontrivial> p;
+ Nontrivial x = std::move(*p);
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void sharedEsquePointerNotInConfig() {
+ my::YetAnotherSharedPtr<Nontrivial> p;
+ Nontrivial x = std::move(*p);
}
-// CHECK-MESSAGES: :[[@LINE-3]]:11: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
void multiStars() {
- std::shared_ptr<int> p;
- int x = 2 * std::move(*p) * 3;
- // CHECK-FIXES: *std::move(p)
+ std::shared_ptr<Nontrivial> p;
+ int x = 2 * std::move(*p).x * 3;
}
-// CHECK-MESSAGES: :[[@LINE-3]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
-// This case should be caught, but isn't.
template <typename T>
void unresolved() {
std::shared_ptr<T> p;
- T x = 2 * std::move(*p) * 3;
+ int x = 2 * std::move(*p).x * 3;
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void unresolvedAsAReference() {
+ std::shared_ptr<T> p;
+ std::shared_ptr<T>& q = p;
+ int x = 2 * std::move(*q).x * 3;
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:15: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void unresolvedAlias() {
+ my::OtherSharedPtr<T> p;
+ Nontrivial x = std::move(*p);
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+void dereferencedGet() {
+ std::shared_ptr<Nontrivial> p;
+ Nontrivial x = std::move(*p.get());
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:18: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void unresolvedDereferencedGet() {
+ std::shared_ptr<T> p;
+ T x = std::move(*p.get());
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:9: warning: don't move the contents out of a shared pointer, as other accessors expect them to remain in a determinate state [bugprone-move-shared-pointer-contents]
+
+template <typename T>
+void rawPointer() {
+ T* p;
+ T x = std::move(*p);
}
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