jankratochvil added inline comments.
================
Comment at: source/Plugins/SymbolFile/DWARF/DWARFCompileUnit.cpp:123
size_t DWARFCompileUnit::ExtractDIEsIfNeeded(bool cu_die_only) {
- const size_t initial_die_array_size = m_data->m_die_array.size();
- if ((cu_die_only && initial_die_array_size > 0) || initial_die_array_size >
1)
- return 0; // Already parsed
+ size_t initial_die_array_size;
+ auto already_parsed = [cu_die_only, &initial_die_array_size]() -> bool {
----------------
clayborg wrote:
> clayborg wrote:
> > I really can't tell what any of the above changed code is doing besides
> > adding the mutex. Seems like you are trying to emulate a condition variable
> > to halt other threads trying to get access to the DIEs. But
> > m_die_array_finished isn't initialized in the constructor or inlined in the
> > header file and initial_die_array_size isn't initialized so I can't really
> > tell what this is supposed to actually do.
> This isn't initialized and it is captured and used in already_parsed below?
I am sorry but the missing initialization was just due to a wrong patch
splitting. Next patch in the series did initialize it. Anyway it has been
reworked now (after dropping whole ExtractDIEsIfNeededKind for its
AllDiesButCuDieOnlyForPartialUnits).
================
Comment at: source/Plugins/SymbolFile/DWARF/DWARFCompileUnit.cpp:123-137
+ size_t initial_die_array_size;
+ auto already_parsed = [cu_die_only, &initial_die_array_size]() -> bool {
+ return (cu_die_only && initial_die_array_size > 0)
+ || initial_die_array_size > 1;
+ };
+ if (already_parsed() && m_data->m_die_array_finished)
+ return 0;
----------------
jankratochvil wrote:
> clayborg wrote:
> > clayborg wrote:
> > > I really can't tell what any of the above changed code is doing besides
> > > adding the mutex. Seems like you are trying to emulate a condition
> > > variable to halt other threads trying to get access to the DIEs. But
> > > m_die_array_finished isn't initialized in the constructor or inlined in
> > > the header file and initial_die_array_size isn't initialized so I can't
> > > really tell what this is supposed to actually do.
> > This isn't initialized and it is captured and used in already_parsed below?
> I am sorry but the missing initialization was just due to a wrong patch
> splitting. Next patch in the series did initialize it. Anyway it has been
> reworked now (after dropping whole ExtractDIEsIfNeededKind for its
> AllDiesButCuDieOnlyForPartialUnits).
>
Condition variable is not required here I think. m_die_array_finished is
initialized before any time it gets read.
https://reviews.llvm.org/D40470
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