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internal/pkgbits: change EnableSync into a dynamic knob

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Rather than requiring users to recompile the compiler and all tools to
enable/disable sync markers, this CL adds a flag word into the Unified
IR file format to allow indicating whether they're enabled or not.
This in turn requires bumping the file format version.

Thanks to drchase@ for benchmarks showing this isn't as expensive as I
feared it would be.

Change-Id: I99afa0ee0b6ef5f30ed8ca840805ff9fd46b1857
Reviewed-on: https://go-review.googlesource.com/c/go/+/417097
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Matthew Dempsky 2022-07-12 11:04:44 -07:00
parent d667be8831
commit 9371a65584
7 changed files with 56 additions and 20 deletions
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1
src/cmd/compile/internal/base/flag.go
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@ -165,6 +165,7 @@ func ParseFlags() {
if buildcfg.Experiment.Unified {
Debug.Unified = 1
}
Debug.SyncFrames = -1 // disable sync markers by default
Debug.Checkptr = -1 // so we can tell whether it is set explicitly