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://golang.org/cl/11406044

4 files changed, 0 insertions, 49 deletions

diff --git a/src/cmd/5l/5.out.h b/src/cmd/5l/5.out.h
index 042017c2a8..eda379c6f6 100644
--- a/src/cmd/5l/5.out.h
+++ b/src/cmd/5l/5.out.h
@@ -201,11 +201,6 @@ enum	as
 	AFUNCDATA,
 	APCDATA,
 
-	// TODO: Remove these.
-	ALOCALS,
-	ANPTRS,
-	APTRS,
-
 	ALAST,
 };
 
diff --git a/src/cmd/5l/l.h b/src/cmd/5l/l.h
index c79bb79e05..10d8b5bd3e 100644
--- a/src/cmd/5l/l.h
+++ b/src/cmd/5l/l.h
@@ -154,8 +154,6 @@ struct	Sym
 	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
 	uchar	special;
 	uchar	fnptr;	// used as fn ptr
 	uchar	stkcheck;
@@ -436,7 +434,6 @@ int32	immaddr(int32);
 int32	opbra(int, int);
 int	brextra(Prog*);
 int	isbranch(Prog*);
-void	fnptrs(void);
 void	doelf(void);
 void	dozerostk(void); // used by -Z
 
diff --git a/src/cmd/5l/obj.c b/src/cmd/5l/obj.c
index d087bb470c..168cf01de9 100644
--- a/src/cmd/5l/obj.c
+++ b/src/cmd/5l/obj.c
@@ -615,51 +615,12 @@ loop:
 		pc++;
 		break;
 
-	case ALOCALS:
-		if(skip)
-			goto casedef;
-		cursym->locals = p->to.offset;
-		pc++;
-		break;
-
 	case ATYPE:
 		if(skip)
 			goto casedef;
 		pc++;
 		goto loop;
 
-	case ANPTRS:
-		if(skip)
-			goto casedef;
-		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 casedef;
-		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:
 		if(cursym != nil && cursym->text) {
 			histtoauto();
@@ -704,7 +665,6 @@ loop:
 		s->text = p;
 		s->value = pc;
 		s->args = p->to.offset2;
-		s->nptrs = -1;
 		lastp = p;
 		p->pc = pc;
 		pc++;
diff --git a/src/cmd/5l/span.c b/src/cmd/5l/span.c
index 96138b2663..fe7aface97 100644
--- a/src/cmd/5l/span.c
+++ b/src/cmd/5l/span.c
@@ -830,7 +830,6 @@ buildop(void)
 		case ARFE:
 		case ATEXT:
 		case AUSEFIELD:
-		case ALOCALS:
 		case ACASE:
 		case ABCASE:
 		case ATYPE: