From e3d2e31377030e84066bed4bbc04bf6c56206305 Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Wed, 11 Sep 2024 12:06:09 -0400
Subject: refactor

---
 masm/sectab.c | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 masm/sectab.c

(limited to 'masm/sectab.c')

diff --git a/masm/sectab.c b/masm/sectab.c
new file mode 100644
index 0000000..d07399f
--- /dev/null
+++ b/masm/sectab.c
@@ -0,0 +1,166 @@
+#include <string.h>
+#include <stdlib.h>
+#include <mips.h>
+#include <merror.h>
+#include <mlimits.h>
+
+#include "asm.h"
+
+#define SECTBL_INIT_LEN 8
+static const char inital_section[MAX_LEX_LENGTH] = "data";
+
+int sectab_init(struct section_table *sectab)
+{
+	sectab->size = SECTBL_INIT_LEN;
+	sectab->len = 0;
+	sectab->sections = malloc(sizeof(struct section) * SECTBL_INIT_LEN);
+
+	if (sectab->sections == NULL) {
+		ERROR("cannot alloc");
+		return M_ERROR;
+	}
+
+	if (sectab_alloc(sectab, &sectab->current, inital_section))
+		return M_ERROR;
+
+	return M_SUCCESS;
+}
+
+void sectab_free(struct section_table *sectab)
+{
+	for (size_t i = 0; i < sectab->len; i++) {
+		reltab_free(&sectab->sections[i].reltab);
+		free(sectab->sections[i].entries);
+	}
+	free(sectab->sections);
+}
+
+struct section_settings {
+	const char *name;
+	bool read;
+	bool write;
+	bool execute;
+	size_t align;
+};
+
+static struct section_settings default_section_settings[] = {
+	{"data",    true, true, false,  1},
+	{"bss",     true, true, false,  1},
+	{"rodata",  true, false, false, 1},
+	{"text",    true, false, true,  4},
+};
+
+int sectab_alloc(struct section_table *sectab, struct section **res,
+		 const char name[MAX_LEX_LENGTH])
+{
+	if (sectab->len >= sectab->size) {
+		sectab->size *= 2;
+		sectab->sections = realloc(sectab->sections,
+			      sizeof(struct section) * sectab->size);
+
+		if (sectab->sections == NULL) {
+			ERROR("cannot realloc");
+			return M_ERROR;
+		}
+	}
+
+	/* set the sectio defaults */
+	struct section *sec;
+	sec = &sectab->sections[sectab->len];
+	strcpy(sec->name,name);
+	sec->len = 0;
+	sec->size = SECTBL_INIT_LEN;
+	sec->alignment = 1;
+	sec->read = true;
+	sec->write = true;
+	sec->execute = false;
+	sec->index = sectab->len;
+	sec->entries = malloc(sizeof(struct section_entry) * SECTBL_INIT_LEN);
+
+	if (reltab_init(&sec->reltab))
+		return M_ERROR;
+
+	/* overwrite the default if the given name has their own
+	 * defaults */
+	for (int i = 0; i < 4; i++) {
+		struct section_settings *set = &default_section_settings[i];
+		if (strcmp(set->name, name) == 0) {
+			sec->read = set->read;
+			sec->write = set->write;
+			sec->execute = set->execute;
+			sec->alignment = set->align;
+			break;
+		}
+	}
+
+	if (sec->entries == NULL) {
+		ERROR("cannot alloc");
+		return M_ERROR;
+	}
+
+	sectab->len++;
+
+	*res = sec;
+	return M_SUCCESS;
+}
+
+int sectab_get(struct section_table *sectab, struct section **sec,
+	       const char name[MAX_LEX_LENGTH])
+{
+	for (size_t i = 0; i < sectab->len; i++) {
+		struct section *temp = &sectab->sections[i];
+		if (strcmp(name, temp->name) == 0) {
+			if (sec != NULL)
+				*sec = temp;
+			return M_SUCCESS;
+		}
+	}
+
+	return M_ERROR;
+}
+
+int sec_push(struct section *section, struct section_entry entry)
+{
+	if (section->len >= section->size) {
+		section->size *= 2;
+		void *new = realloc(section->entries,
+			 sizeof(struct section_entry) * section->size);
+
+		if (new == NULL) {
+			ERROR("cannot realloc");
+			return M_ERROR;
+		}
+
+		section->entries = new;
+	}
+
+	section->entries[section->len++] = entry;
+
+	return M_SUCCESS;
+}
+
+size_t sec_size(struct section *sec)
+{
+	size_t n = 0;
+	for (size_t i = 0; i < sec->len; i++) {
+		size_t t = sec->entries[i].size;
+		size_t m = t % sec->alignment;
+		if (m)
+			t += sec->alignment - m;
+		n += t;
+	}
+	return n;
+}
+
+size_t sec_index(struct section *sec, size_t idx)
+{
+	size_t n = 0;
+	for (size_t i = 0; i < idx; i++) {
+		size_t t = sec->entries[i].size;
+		size_t m = t % sec->alignment;
+		if (m)
+			t += sec->alignment - m;
+		n += t;
+	}
+	return n;
+}
-- 
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