tree a4245d1695979eb3bab2d01099813142f31b7c1b
parent 4bba95e45ba5c7742bc6b5450ba6d62361c6f26e
author Kristina Bessonova <kbessonova@accesssoftek.com> 1638028600 +0200
committer Copybara-Service <copybara-worker@google.com> 1638029284 -0800

[DwarfCompileUnit] Set parent DIE right after creating a local entity

No functional changes intended.

Before this patch DwarfCompileUnit::createScopeChildrenDIE() and
DwarfCompileUnit::createAndAddScopeChildrenDIE() used to emit child subtrees
and then when all the children get created, attach them to a parent scope DIE.
However, when a DIE doesn't have a parent, all the requests for its unit DIE
fail.

Currently, this is not a big issue since it isn't usually needed to know unit DIE
for a local (function-scoped) entity. But once we introduce lexical blocks as
a valid scope for global variables (static locals) and type DIEs, any requests
for a unit DIE need to be guarded against local scope due to the potential
absence of the DIE's parent.

To avoid the aforementioned issue, this patch refactors a few DwarfCompileUnit
methods to support the idea of attaching a DIE to its parent as close to the
creation of this DIE as possible.

Reviewed By: ellis

Differential Revision: https://reviews.llvm.org/D114350

GitOrigin-RevId: 904328932699cd5e0eefab2c81e4f51421fd3f33