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