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| author | Keith Randall <khr@golang.org> | 2025-04-16 13:50:44 -0700 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2025-05-22 15:10:44 -0700 |
| commit | aec96d686be16fda519f6fd4a6e3bbfe3454c0b9 (patch) | |
| tree | f28a6731fefd423cac23dfb2df6a6c27ca5f7ffa | |
| parent | c684dfcb8a8fe38a8414bfd07b94e9995e5cd308 (diff) | |
| download | go-aec96d686be16fda519f6fd4a6e3bbfe3454c0b9.tar.xz | |
doc: mention stack allocation of variable-sized make calls
Also mention the bisect tool and flag used to track down
incorrect uses.
Change-Id: Id36a236e1bb2733b8611b22a5b16916e7d9f5522
Reviewed-on: https://go-review.googlesource.com/c/go/+/666075
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
| -rw-r--r-- | doc/next/5-toolchain.md | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/next/5-toolchain.md b/doc/next/5-toolchain.md index c270e9dfc9..3708700c93 100644 --- a/doc/next/5-toolchain.md +++ b/doc/next/5-toolchain.md @@ -38,6 +38,18 @@ successfully in Go 1.25. If this change is affecting your code, the solution is the non-nil error check earlier in your code, preferably immediately after the error-generating statement. +<!-- CLs 653856, 657937, 663795, TBD 664299 --> + +The compiler can now allocate the backing store for slices on the +stack in more situations, which improves performance. This change has +the potential to amplify the effects of incorrect +[unsafe.Pointer](/pkg/unsafe#Pointer) usage, see for example [issue +73199](/issue/73199). In order to track down these problems, the +[bisect tool](https://pkg.go.dev/golang.org/x/tools/cmd/bisect) can be +used to find the allocation causing trouble using the +`-compile=variablemake` flag. All such new stack allocations can also +be turned off using `-gcflags=all=-d=variablemakehash=n`. + ## Assembler {#assembler} ## Linker {#linker} |