PostfixExpression: move parser out of NativePDB internals

Authored by labath on Apr 24 2019, 12:27 AM.


PostfixExpression: move parser out of NativePDB internals

The postfix expressions in PDB and breakpad symbol files are similar
enough that they can be parsed by the same parser. This patch
generalizes the parser in the NativePDB plugin and moves it into the
PostfixExpression file created in the previous commit (r358976).

The generalization consists of treating any unrecognised token as a
"symbol" node (previously these would only be created for tokens
starting with "$", and other token would abort the parse). This is
needed because breakpad symbols can also contain ".cfa" tokens, which
refer to the frame's CFA.

The cosmetic changes include:

  • using a factory function instead of a class for creating nodes (this is more generic as it allows the same BumpPtrAllocator to be used for other things too)
  • using dedicated function for parsing operator tokens instead of a DenseMap (more efficient as we don't need to create the DenseMap every time).

Reviewers: amccarth, clayborg, JDevlieghere, aleksandr.urakov

Subscribers: jasonmolenda, lldb-commits, markmentovai, mgorny

Differential Revision: https://reviews.llvm.org/D61003

llvm-svn: 359073


labathApr 24 2019, 12:27 AM
Differential Revision
D61003: PostfixExpression: move parser out of NativePDB internals
rG71e8c6f20fe4: Add "const" in GetUnderlyingObjects. NFC