cmd/ld: get rid of map.bucket's data field from dwarf info.

The data field is the generic array that acts as a standin
for the keys and values arrays for the generic runtime code.
We want to substitute the keys and values arrays for the data
array, not just add keys and values in addition to it.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/81160044

1 files changed, 15 insertions, 4 deletions

diff --git a/src/cmd/ld/dwarf.c b/src/cmd/ld/dwarf.c
index fe1576bf51..9966cc8d1f 100644
--- a/src/cmd/ld/dwarf.c
+++ b/src/cmd/ld/dwarf.c
@@ -1099,21 +1099,29 @@ defptrto(DWDie *dwtype)
 }
 
 // Copies src's children into dst. Copies attributes by value.
-// DWAttr.data is copied as pointer only.
+// DWAttr.data is copied as pointer only.  If except is one of
+// the top-level children, it will not be copied.
 static void
-copychildren(DWDie *dst, DWDie *src)
+copychildrenexcept(DWDie *dst, DWDie *src, DWDie *except)
 {
 	DWDie *c;
 	DWAttr *a;
 
 	for (src = src->child; src != nil; src = src->link) {
+		if(src == except)
+			continue;
 		c = newdie(dst, src->abbrev, getattr(src, DW_AT_name)->data);
 		for (a = src->attr; a != nil; a = a->link)
 			newattr(c, a->atr, a->cls, a->value, a->data);
-		copychildren(c, src);
+		copychildrenexcept(c, src, nil);
 	}
 	reverselist(&dst->child);
 }
+static void
+copychildren(DWDie *dst, DWDie *src)
+{
+	copychildrenexcept(dst, src, nil);
+}
 
 // Search children (assumed to have DW_TAG_member) for the one named
 // field and set its DW_AT_type to dwtype
@@ -1253,7 +1261,10 @@ synthesizemaptypes(DWDie *die)
 			      mkinternaltypename("bucket",
 						 getattr(keytype, DW_AT_name)->data,
 						 getattr(valtype, DW_AT_name)->data));
-		copychildren(dwhb, bucket);
+		// Copy over all fields except the field "data" from the generic bucket.
+		// "data" will be replaced with keys/values below.
+		copychildrenexcept(dwhb, bucket, find(bucket, "data"));
+		
 		fld = newdie(dwhb, DW_ABRV_STRUCTFIELD, "keys");
 		newrefattr(fld, DW_AT_type, dwhk);
 		newmemberoffsetattr(fld, BucketSize + PtrSize);