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Fix #9490: SIGSEGV involving LyX macros --- A reproducible MWE (part II)

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This commit is contained in:
Enrico Forestieri 2015-10-03 17:41:25 +02:00
parent 355b24848f
commit 82fe5183ca
1 changed files with 39 additions and 4 deletions
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43
src/mathed/MathMacro.cpp
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@ -63,6 +63,8 @@ public:
///
void setOwner(MathMacro * mathMacro) { mathMacro_ = mathMacro; }
///
MathMacro const * owner() { return mathMacro_; }
///
InsetCode lyxCode() const { return ARGUMENT_PROXY_CODE; }
///
void metrics(MetricsInfo & mi, Dimension & dim) const {
@ -151,6 +153,9 @@ public:
/// This needs to be called every time a copy of the owner is created
/// (bug 9418).
void updateChildren(MathMacro * owner);
/// Recursively update the pointers of all expanded macros
/// appearing in the arguments of the current macro
void updateNestedChildren(MathMacro * owner, InsetMathNest * ni);
/// name of macro
docstring name_;
/// current display mode
@ -190,17 +195,46 @@ void MathMacro::Private::updateChildren(MathMacro * owner)
ArgumentProxy * p = dynamic_cast<ArgumentProxy *>(expanded_[i].nucleus());
if (p)
p->setOwner(owner);
InsetMathNest * ni = expanded_[i].nucleus()->asNestInset();
if (ni)
updateNestedChildren(owner, ni);
}
if (macro_ && lyxrc.preview == LyXRC::PREVIEW_ON) {
// As MathData::metrics() is not called when instant preview is
// on, we have to update macro_ by ourselves. In this case, we
// simply let it point to the last known good copy of MacroData.
if (macro_) {
// The macro_ pointer is updated when MathData::metrics() is
// called. However, when instant preview is on or the macro is
// not on screen, MathData::metrics() is not called and we may
// have a dangling pointer. As a safety measure, when a macro
// is copied, always let macro_ point to the backup copy of the
// MacroData structure. This backup is updated every time the
// macro is changed, so it will not become stale.
macro_ = &macroBackup_;
}
}
void MathMacro::Private::updateNestedChildren(MathMacro * owner, InsetMathNest * ni)
{
for (size_t i = 0; i < ni->nargs(); ++i) {
MathData & ar = ni->cell(i);
for (size_t j = 0; j < ar.size(); ++j) {
ArgumentProxy * ap = dynamic_cast
<ArgumentProxy *>(ar[j].nucleus());
if (ap) {
MathMacro::Private * md = ap->owner()->d;
if (md->macro_)
md->macro_ = &md->macroBackup_;
ap->setOwner(owner);
}
InsetMathNest * imn = ar[j].nucleus()->asNestInset();
if (imn)
updateNestedChildren(owner, imn);
}
}
}
MathMacro::MathMacro(Buffer * buf, docstring const & name)
: InsetMathNest(buf, 0), d(new Private(buf, name))
{}
@ -209,6 +243,7 @@ MathMacro::MathMacro(Buffer * buf, docstring const & name)
MathMacro::MathMacro(MathMacro const & that)
: InsetMathNest(that), d(new Private(*that.d))
{
setBuffer(*that.buffer_);
d->updateChildren(this);
}