Landing: 95c85b404da4

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Project / Subsystem

gcc / eh

Date

2026-09-02

Author

Andrea Pinski

Commit

95c85b404da4fe6eea7b7f3b51e1270b77f0dab8

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: eh
patch_id: —
commit_hash: 95c85b404da4fe6eea7b7f3b51e1270b77f0dab8
source_type: github
headline: eh: Use `lhs_could_trap_p` for non-call exceptions in assignment.
tldr: Improved exception handling for assignments involving the 'this' pointer by using more precise trapping checks.
author: Andrea Pinski
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • eh
• exception handling
• optimization
• this pointer
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/95c85b404da4fe6eea7b7f3b51e1270b77f0dab8
date: 2026-09-02T00:00:00.000Z

The exception handling subsystem now correctly accounts for non-call exceptions that can occur on the left-hand side (LHS) of assignments, particularly when the this pointer is involved. Previously, a fix for PR127133 incorrectly marked the this argument as non-trapping, leading to an oversight in exception analysis. This commit replaces checks for tree_could_throw_p with lhs_could_trap_p and tree_could_throw_1 in lower_eh_constructs_2 and related functions, ensuring that potential trapping on the LHS is properly identified, fixing PR127183.