| commit | c3f149250e036f6bf77e7c9512dd3d57e1c78452 | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Thu Nov 14 17:03:44 2019 -0500 |
| committer | Cherry Zhang <cherryyz@google.com> | Wed Nov 27 01:29:00 2019 +0000 |
| tree | b874954c7d5b7193d66ecc7de4f7e7cfe951dfe5 | |
| parent | 4a378d712d4a089e2242fe49de6547d493f52bf5 [diff] |
cmd/internal/obj, runtime: use register map to mark unsafe points Currently we use stack map index -2 to mark unsafe points, i.e. PC ranges that is not safe for async preemption. This has a problem: it cannot mark CALL instructions, because for stack scan a valid stack map index is needed. This CL switches to use register map index for marking unsafe points instead, which does not conflict with stack scan and can be applied on CALL instructions. This is necessary as next CL will mark call to morestack nonpreemptible. For #35470. Change-Id: I357bf26c996e1fee1e7eebe4e6bb07d62930d3f7 Reviewed-on: https://go-review.googlesource.com/c/go/+/207349 Reviewed-by: David Chase <drchase@google.com>
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