зеркало из https://github.com/mozilla/gecko-dev.git
63 строки
1.9 KiB
C++
63 строки
1.9 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MemMoveAnnotation_h__
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#define MemMoveAnnotation_h__
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#include "CustomMatchers.h"
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#include "CustomTypeAnnotation.h"
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#include "Utils.h"
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#include <unordered_set>
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class MemMoveAnnotation final : public CustomTypeAnnotation {
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public:
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MemMoveAnnotation()
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: CustomTypeAnnotation(moz_non_memmovable, "non-memmove()able") {}
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virtual ~MemMoveAnnotation() {}
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protected:
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std::string getImplicitReason(const TagDecl *D,
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VisitFlags &ToVisit) const override {
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// Annotate everything in ::std, with a few exceptions; see bug
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// 1201314 for discussion.
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if (getDeclarationNamespace(D) != "std") {
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return "";
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}
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StringRef Name = getNameChecked(D);
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// If the type has a trivial move constructor and destructor, it is safe to
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// memmove, and we don't need to visit any fields.
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auto RD = dyn_cast<CXXRecordDecl>(D);
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if (RD && RD->isCompleteDefinition() &&
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(RD->hasTrivialMoveConstructor() ||
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(!RD->hasMoveConstructor() && RD->hasTrivialCopyConstructor())) &&
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RD->hasTrivialDestructor()) {
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ToVisit = VISIT_NONE;
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return "";
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}
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// This doesn't check that it's really ::std::pair and not
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// ::std::something_else::pair, but should be good enough.
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if (isNameExcepted(Name.data())) {
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// If we're an excepted name, stop traversing within the type further,
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// and only check template arguments for foreign types.
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ToVisit = VISIT_TMPL_ARGS;
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return "";
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}
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return "it is an stl-provided type not guaranteed to be memmove-able";
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}
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private:
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bool isNameExcepted(StringRef Name) const {
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return Name == "pair" || Name == "atomic" || Name == "tuple";
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}
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};
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extern MemMoveAnnotation NonMemMovable;
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#endif
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