* libgo patch committed: Mark syscall functions noescape
@ 2019-01-16 22:38 Ian Lance Taylor
0 siblings, 0 replies; only message in thread
From: Ian Lance Taylor @ 2019-01-16 22:38 UTC (permalink / raw)
To: gcc-patches, gofrontend-dev
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This patch by Cherry Zhang marks the syscall functions that call into
C code as noescape, so that calling syscall functions that take
pointers do not require allocation. Bootstrapped and ran Go testsuite
on x86_64-pc-linux-gnu. Committed to mainline.
Ian
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Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE (revision 267956)
+++ gcc/go/gofrontend/MERGE (working copy)
@@ -1,4 +1,4 @@
-9a79c333e896ea49f6a708d459148074d29a2af6
+ee94431c133a90ca5c3c5ebbebcb019c60258dac
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.
Index: libgo/go/syscall/exec_linux.go
===================================================================
--- libgo/go/syscall/exec_linux.go (revision 267941)
+++ libgo/go/syscall/exec_linux.go (working copy)
@@ -62,6 +62,7 @@ func runtime_AfterFork()
func runtime_AfterForkInChild()
// Implemented in clone_linux.c
+//go:noescape
func rawClone(flags _C_ulong, child_stack *byte, ptid *Pid_t, ctid *Pid_t, regs unsafe.Pointer) _C_long
// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
Index: libgo/go/syscall/mksyscall.awk
===================================================================
--- libgo/go/syscall/mksyscall.awk (revision 267941)
+++ libgo/go/syscall/mksyscall.awk (working copy)
@@ -98,6 +98,7 @@ BEGIN {
printf("// Automatically generated wrapper for %s/%s\n", gofnname, cfnname)
if (!(cfnname in cfns)) {
cfns[cfnname] = 1
+ printf("//go:noescape\n")
printf("//extern %s\n", cfnname)
printf("func c_%s(%s) %s\n", cfnname, cfnparams, cfnresult)
}
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2019-01-16 22:38 libgo patch committed: Mark syscall functions noescape Ian Lance Taylor
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