liblink, cmd/ld, runtime: remove stackguard1

Now that we've removed all the C code in runtime and the C compilers,
there is no need to have a separate stackguard field to check for C
code on Go stack.

Remove field g.stackguard1 and rename g.stackguard0 to g.stackguard.
Adjust liblink and cmd/ld as necessary.

Change-Id: I54e75db5a93d783e86af5ff1a6cd497d669d8d33
Reviewed-on: https://go-review.googlesource.com/2144
Reviewed-by: Keith Randall <khr@golang.org>

1 files changed, 0 insertions, 53 deletions

diff --git a/src/cmd/ld/lib.c b/src/cmd/ld/lib.c
index 925274bfd3..9c58c2276d 100644
--- a/src/cmd/ld/lib.c
+++ b/src/cmd/ld/lib.c
@@ -1564,56 +1564,3 @@ diag(char *fmt, ...)
 		errorexit();
 	}
 }
-
-void
-checkgo(void)
-{
-	LSym *s;
-	Reloc *r;
-	int i;
-	int changed;
-	
-	if(!debug['C'])
-		return;
-	
-	// TODO(rsc,khr): Eventually we want to get to no Go-called C functions at all,
-	// which would simplify this logic quite a bit.
-
-	// Mark every Go-called C function with cfunc=2, recursively.
-	do {
-		changed = 0;
-		for(s = ctxt->textp; s != nil; s = s->next) {
-			if(s->cfunc == 0 || (s->cfunc == 2 && s->nosplit)) {
-				for(i=0; i<s->nr; i++) {
-					r = &s->r[i];
-					if(r->sym == nil)
-						continue;
-					if((r->type == R_CALL || r->type == R_CALLARM) && r->sym->type == STEXT) {
-						if(r->sym->cfunc == 1) {
-							changed = 1;
-							r->sym->cfunc = 2;
-						}
-					}
-				}
-			}
-		}
-	}while(changed);
-
-	// Complain about Go-called C functions that can split the stack
-	// (that can be preempted for garbage collection or trigger a stack copy).
-	for(s = ctxt->textp; s != nil; s = s->next) {
-		if(s->cfunc == 0 || (s->cfunc == 2 && s->nosplit)) {
-			for(i=0; i<s->nr; i++) {
-				r = &s->r[i];
-				if(r->sym == nil)
-					continue;
-				if((r->type == R_CALL || r->type == R_CALLARM) && r->sym->type == STEXT) {
-					if(s->cfunc == 0 && r->sym->cfunc == 2 && !r->sym->nosplit)
-						print("Go %s calls C %s\n", s->name, r->sym->name);
-					else if(s->cfunc == 2 && s->nosplit && !r->sym->nosplit)
-						print("Go calls C %s calls %s\n", s->name, r->sym->name);
-				}
-			}
-		}
-	}
-}