runtime: use funcdata to supply garbage collection information

This CL introduces a FUNCDATA number for runtime-specific
garbage collection metadata, changes the C and Go compilers
to emit that metadata, and changes the runtime to expect it.

The old pseudo-instructions that carried this information
are gone, as is the linker code to process them.

R=golang-dev, dvyukov, cshapiro
CC=golang-dev
https://codereview.appspot.com/11406044

3 files changed, 0 insertions, 48 deletions

diff --git a/src/cmd/8l/8.out.h b/src/cmd/8l/8.out.h
index fecb0852c..7683d50ad 100644
--- a/src/cmd/8l/8.out.h
+++ b/src/cmd/8l/8.out.h
@@ -582,11 +582,6 @@ enum	as
 	AFUNCDATA,
 	APCDATA,
 	
-	// TODO: Remove these.
-	ALOCALS,
-	ANPTRS,
-	APTRS,
-
 	ALAST
 };
 
diff --git a/src/cmd/8l/l.h b/src/cmd/8l/l.h
index 2cf8c76b1..67e607b5b 100644
--- a/src/cmd/8l/l.h
+++ b/src/cmd/8l/l.h
@@ -143,10 +143,7 @@ struct	Sym
 	int32	got;
 	int32	align;	// if non-zero, required alignment in bytes
 	int32	elfsym;
-	int32	locals;	// size of stack frame locals area
 	int32	args;	// size of stack frame incoming arguments area
-	int32	nptrs;	// number of bits in the pointer map
-	uint32*	ptrs;	// pointer map data
 	Sym*	hash;	// in hash table
 	Sym*	allsym;	// in all symbol list
 	Sym*	next;	// in text or data list
diff --git a/src/cmd/8l/obj.c b/src/cmd/8l/obj.c
index 5e8988c9c..8c84aaaea 100644
--- a/src/cmd/8l/obj.c
+++ b/src/cmd/8l/obj.c
@@ -614,51 +614,12 @@ loop:
 		pc++;
 		goto loop;
 
-	case ALOCALS:
-		if(skip)
-			goto casdef;
-		cursym->locals = p->to.offset;
-		pc++;
-		goto loop;
-
 	case ATYPE:
 		if(skip)
 			goto casdef;
 		pc++;
 		goto loop;
 
-	case ANPTRS:
-		if(skip)
-			goto casdef;
-		if(cursym->nptrs != -1) {
-			diag("ldobj1: multiple pointer maps defined for %s", cursym->name);
-			errorexit();
-		}
-		if(p->to.offset > cursym->args/PtrSize) {
-			diag("ldobj1: pointer map definition for %s exceeds its argument size", cursym->name);
-			errorexit();
-		}
-		cursym->nptrs = p->to.offset;
-		if(cursym->nptrs != 0)
-			cursym->ptrs = mal((rnd(cursym->nptrs, 32) / 32) * sizeof(*cursym->ptrs));
-		pc++;
-		goto loop;
-
-	case APTRS:
-		if(skip)
-			goto casdef;
-		if(cursym->nptrs == -1 || cursym->ptrs == nil) {
-			diag("ldobj1: pointer map data provided for %s without a definition", cursym->name);
-			errorexit();
-		}
-		if(p->from.offset*32 >= rnd(cursym->nptrs, 32)) {
-			diag("ldobj1: excessive pointer map data provided for %s", cursym->name);
-			errorexit();
-		}
-		cursym->ptrs[p->from.offset] = p->to.offset;
-		pc++;
-		goto loop;
-
 	case ATEXT:
 		s = p->from.sym;
 		if(s->text != nil) {
@@ -699,7 +660,6 @@ loop:
 		s->hist = gethist();
 		s->value = pc;
 		s->args = p->to.offset2;
-		s->nptrs = -1;
 		lastp = p;
 		p->pc = pc++;
 		goto loop;