cmd/compile: introduce //go:systemstack annotation
//go:systemstack means that the function must run on the system stack.
Add one use in runtime as a demonstration.
Fixes #9174.
Change-Id: I8d4a509cb313541426157da703f1c022e964ace4
Reviewed-on: https://go-review.googlesource.com/10840
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
diff --git a/src/cmd/compile/internal/gc/syntax.go b/src/cmd/compile/internal/gc/syntax.go
index b05027b..ace6914 100644
--- a/src/cmd/compile/internal/gc/syntax.go
+++ b/src/cmd/compile/internal/gc/syntax.go
@@ -174,6 +174,7 @@
Dupok bool // duplicate definitions ok
Wrapper bool // is method wrapper
Needctxt bool // function uses context register (has closure variables)
+ Systemstack bool // must run on system stack
}
// Node ops.
