qbe

commit 25f7bc06e3c7ac93e1b2b06a9828c24471a5e7d2
parent bf3e6753f3ee28c33aa16dd9b0a65636e612eac1
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Thu,  8 Oct 2015 14:49:00 -0400

emit alignment directives properly

Diffstat:
M
lisc/emit.c
 | 
33
++++++++++++++++-----------------
M
lisc/lisc.h
 | 
2
++
M
lisc/parse.c
 | 
12
+++++++++---

3 files changed, 27 insertions(+), 20 deletions(-)
diff --git a/lisc/emit.c b/lisc/emit.c
@@ -315,7 +315,6 @@ emitfn(Fn *fn, FILE *f)
 	int *r, c, fs;
 
 	fprintf(f,
-		"\n"
 		".text\n"
 		".globl %s\n"
 		".type %s, @function\n"
@@ -371,34 +370,34 @@ emitfn(Fn *fn, FILE *f)
 void
 emitdat(Dat *d, FILE *f)
 {
+	static char *dtoa[] = {
+		[DAlign] = ".align",
+		[DB] = "\t.byte",
+		[DH] = "\t.value",
+		[DW] = "\t.long",
+		[DL] = "\t.quad"
+	};
+
 	switch (d->type) {
+	case DStart:
+		fprintf(f, ".data\n");
+		break;
+	case DEnd:
+		fprintf(f, "\n");
+		break;
 	case DName:
 		fprintf(f,
-			"\n"
-			".data\n"
 			".globl %s\n"
 			".type %s, @object\n"
 			"%s:\n",
 			d->u.str, d->u.str, d->u.str
 		);
 		break;
-	case DAlign:
-		fprintf(f, ".align %"PRId64"\n", d->u.num);
-		break;
 	case DA:
 		fprintf(f, "\t.string \"%s\"\n", d->u.str);
 		break;
-	case DB:
-		fprintf(f, "\t.byte %"PRId64"\n", d->u.num);
-		break;
-	case DH:
-		fprintf(f, "\t.value %"PRId64"\n", d->u.num);
-		break;
-	case DW:
-		fprintf(f, "\t.long %"PRId64"\n", d->u.num);
-		break;
-	case DL:
-		fprintf(f, "\t.quad %"PRId64"\n", d->u.num);
+	default:
+		fprintf(f, "%s %"PRId64"\n", dtoa[d->type], d->u.num);
 		break;
 	}
 }
diff --git a/lisc/lisc.h b/lisc/lisc.h
@@ -266,6 +266,8 @@ struct Typ {
 
 struct Dat {
 	enum {
+		DStart,
+		DEnd,
 		DName,
 		DAlign,
 		DA,
diff --git a/lisc/parse.c b/lisc/parse.c
@@ -728,14 +728,15 @@ parsetyp()
 static void
 parsedat(void cb(Dat *))
 {
+	char s[NString];
 	int t;
 	Dat d;
 
+	d.type = DStart;
+	cb(&d);
 	if (nextnl() != TGlo || nextnl() != TEq)
 		err("data name, then = expected");
-	d.type = DName;
-	d.u.str = tokval.str;
-	cb(&d);
+	strcpy(s, tokval.str);
 	t = nextnl();
 	if (t == TAlign) {
 		if (nextnl() != TNum)
@@ -745,6 +746,9 @@ parsedat(void cb(Dat *))
 		cb(&d);
 		t = nextnl();
 	}
+	d.type = DName;
+	d.u.str = s;
+	cb(&d);
 	if (t == TStr) {
 		d.type = DA;
 		d.u.str = tokval.str;
@@ -770,6 +774,8 @@ parsedat(void cb(Dat *))
 		if (t != TComma)
 			err(", or } expected");
 	}
+	d.type = DEnd;
+	cb(&d);
 }
 
 Fn *