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cmd/internal/obj, runtime: add NOFRAME flag to suppress stack frame set up on ppc64x

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Replace the confusing game where a frame size of $-8 would suppress the
implicit setting up of a stack frame with a nice explicit flag.

The code to set up the function prologue is still a little confusing but better
than it was.

Change-Id: I1d49278ff42c6bc734ebfb079998b32bc53f8d9a
Reviewed-on: https://go-review.googlesource.com/15670
Reviewed-by: Minux Ma <minux@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2015-10-09 12:44:27 +13:00
parent d0c9b40964
commit 45c06b27a4
14 changed files with 107 additions and 80 deletions
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5
src/cmd/internal/obj/textflag.go
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@ -39,4 +39,9 @@ const (
// Allocate a word of thread local storage and store the offset from the
// thread local base to the thread local storage in this variable.
TLSBSS = 256
// Do not insert instructions to allocate a stack frame for this function.
// Only valid on functions that declare a frame size of 0.
// TODO(mwhudson): only implemented for ppc64x at present.
NOFRAME = 512
)