use a new struct for symbols

Symbols are a useful abstraction
that occurs in both Con and Alias.
In this patch they get their own
struct. This new struct packages
a symbol name and a type; the type
tells us where the symbol name
must be interpreted (currently, in
gobal memory or in thread-local
storage).

The refactor fixed a bug in
addcon(), proving the value of
packaging symbol names with their
type.

2 files changed, 13 insertions, 10 deletions

diff --git a/rv64/emit.c b/rv64/emit.c
index bb53c83..4ce6555 100644
--- a/rv64/emit.c
+++ b/rv64/emit.c
@@ -129,8 +129,8 @@ slot(int s, Fn *fn)
 static void
 emitaddr(Con *c, FILE *f)
 {
-	assert(c->reloc == RelDef);
-	fputs(str(c->label), f);
+	assert(c->sym.type == SGlo);
+	fputs(str(c->sym.id), f);
 	if (c->bits.i)
 		fprintf(f, "+%"PRIi64, c->bits.i);
 }
@@ -229,17 +229,17 @@ loadaddr(Con *c, char *rn, FILE *f)
 {
 	char off[32];
 
-	if (c->reloc == RelThr) {
+	if (c->sym.type == SThr) {
 		if (c->bits.i)
 			sprintf(off, "+%"PRIi64, c->bits.i);
 		else
 			off[0] = 0;
 		fprintf(f, "\tlui %s, %%tprel_hi(%s)%s\n",
-			rn, str(c->label), off);
+			rn, str(c->sym.id), off);
 		fprintf(f, "\tadd %s, %s, tp, %%tprel_add(%s)%s\n",
-			rn, rn, str(c->label), off);
+			rn, rn, str(c->sym.id), off);
 		fprintf(f, "\taddi %s, %s, %%tprel_lo(%s)%s\n",
-			rn, rn, str(c->label), off);
+			rn, rn, str(c->sym.id), off);
 	} else {
 		fprintf(f, "\tla %s, ", rn);
 		emitaddr(c, f);
@@ -279,7 +279,8 @@ fixmem(Ref *pr, Fn *fn, FILE *f)
 	r = *pr;
 	if (rtype(r) == RCon) {
 		c = &fn->con[r.val];
-		if (c->type == CAddr && c->reloc == RelThr) {
+		if (c->type == CAddr)
+		if (c->sym.type == SThr) {
 			loadcon(c, T6, Kl, f);
 			*pr = TMP(T6);
 		}
@@ -383,9 +384,11 @@ emitins(Ins *i, Fn *fn, FILE *f)
 		switch (rtype(i->arg[0])) {
 		case RCon:
 			con = &fn->con[i->arg[0].val];
-			if (con->type != CAddr || con->bits.i)
+			if (con->type != CAddr
+			|| con->sym.type != SGlo
+			|| con->bits.i)
 				goto Invalid;
-			fprintf(f, "\tcall %s\n", str(con->label));
+			fprintf(f, "\tcall %s\n", str(con->sym.id));
 			break;
 		case RTmp:
 			emitf("jalr %0", i, fn, f);
diff --git a/rv64/isel.c b/rv64/isel.c
index 42c0097..8921a07 100644
--- a/rv64/isel.c
+++ b/rv64/isel.c
@@ -46,7 +46,7 @@ fixarg(Ref *r, int k, Ins *i, Fn *fn)
 			c = &fn->con[fn->ncon-1];
 			sprintf(buf, "\"%sfp%d\"", T.asloc, n);
 			*c = (Con){.type = CAddr};
-			c->label = intern(buf);
+			c->sym.id = intern(buf);
 			emit(Oload, k, r1, CON(c-fn->con), R);
 			break;
 		}