From 17d11b2e0af9cbbe9e2c02c4d1a3d2cb4509701e Mon Sep 17 00:00:00 2001
From: Bobby Bingham <koorogi@koorogi.info>
Date: Wed, 18 Jan 2017 18:17:56 -0600
Subject: nqasm: store instructions in memory before assembling

---
 nqasm.c | 53 +++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 37 insertions(+), 16 deletions(-)

(limited to 'nqasm.c')

diff --git a/nqasm.c b/nqasm.c
index 138407e..738f815 100644
--- a/nqasm.c
+++ b/nqasm.c
@@ -13,27 +13,43 @@ struct label {
 	uint16_t addr;
 };
 
-static struct labels {
-	struct vector v;
-	struct label l[];
-} *labels;
-
 uint16_t addr;
 
-static int labels_init(void)
-{
-	return !(labels = vector_init(8, sizeof labels->l[0], sizeof *labels));
-}
+#define DEFINE_VECTOR(name, arraytype, arrayname, initsize) \
+	static struct name { \
+		struct vector v; \
+		arraytype arrayname[]; \
+	} *name; \
+	\
+	static int name ## _init(void) \
+	{ \
+		return !(name = vector_init(initsize, sizeof (arraytype), sizeof *name)); \
+	} \
+	\
+	static arraytype *name ## _append(void) \
+	{ \
+		struct vector *v = &name->v; \
+		arraytype     *e = vector_append(&v); \
+		name = (struct name *)v; \
+		return e; \
+	}
 
-static struct label *labels_append(void)
+DEFINE_VECTOR(labels, struct label, l, 8)
+DEFINE_VECTOR(instrs, struct instruction, i, 256)
+
+void add_instruction(const struct instruction *inst)
 {
-	struct vector *v = &labels->v;
-	struct label  *l = vector_append(&v);
-	labels = (struct labels *)v;
-	return l;
+	struct instruction *i = instrs_append();
+	if (!i) {
+		fprintf(stderr, "unable to allocate instruction\n");
+		exit(1);
+	}
+
+	*i = *inst;
+	addr += 2;
 }
 
-void add_instruction(const struct instruction *inst)
+static void assemble_instruction(const struct instruction *inst)
 {
 	const struct mnemonic *mnem = &mnemonics[inst->mnem];
 	uint16_t bits = mnem->bits;
@@ -45,7 +61,6 @@ void add_instruction(const struct instruction *inst)
 	}
 
 	printf("%04x\n", bits);
-	addr += 2;
 }
 
 void add_label(const char *name)
@@ -65,8 +80,14 @@ void add_label(const char *name)
 int main(int argc, char **argv)
 {
 	labels_init();
+	instrs_init();
 
 	yyparse();
+
+	for (size_t i = 0; i < instrs->v.count; i++) {
+		assemble_instruction(instrs->i + i);
+	}
+
 	return 0;
 }
 
-- 
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