code review 106260045: runtime: simpler and faster GC

src/cmd/ld/decodesym.c

Index: src/cmd/ld/decodesym.c
===================================================================
--- a/src/cmd/ld/decodesym.c
+++ b/src/cmd/ld/decodesym.c
@@ -70,14 +70,28 @@
 static int
 commonsize(void)
 {
-	return 7*PtrSize + 8;
+	return 8*PtrSize + 8;
 }
 
 // Type.commonType.kind
 uint8
 decodetype_kind(LSym *s)
 {
-	return s->p[1*PtrSize + 7] & ~KindNoPointers;	//  0x13 / 0x1f
+	return s->p[1*PtrSize + 7] & KindMask;	//  0x13 / 0x1f
+}
+
+// Type.commonType.kind
+uint8
+decodetype_noptr(LSym *s)
+{
+	return s->p[1*PtrSize + 7] & KindNoPointers;	//  0x13 / 0x1f
+}
+
+// Type.commonType.kind
+uint8
+decodetype_usegcprog(LSym *s)
+{
+	return s->p[1*PtrSize + 7] & KindGCProg;	//  0x13 / 0x1f
 }
 
 // Type.commonType.size
@@ -89,9 +103,15 @@
 
 // Type.commonType.gc
 LSym*
-decodetype_gc(LSym *s)
+decodetype_gcprog(LSym *s)
 {
-	return decode_reloc_sym(s, 1*PtrSize + 8 + 1*PtrSize);
+	return decode_reloc_sym(s, 1*PtrSize + 8 + 2*PtrSize);
+}
+
+uint8*
+decodetype_gcmask(LSym *s)
+{
+	return (uint8*)(s->p + 1*PtrSize + 8 + 1*PtrSize);
 }
 
 // Type.ArrayType.elem and Type.SliceType.Elem