label.c

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#include "assemble.h"

HKEY *label_hashkey(const char *value);

unsigned labelhash(const char *prog, const char *label);

int compare_adr(const void *a, const void *b);

static int labelcnt = 0;

static LABELTAB *labels[LABELTABSIZE];

static CERR cerr_label[] = {
    { 101, "label already defined" },
    { 102, "label table is full" },
    { 103, "label not found" },
};
 
HKEY *label_hashkey(const char *value) {
    HKEY *key = NULL;
 
    key = malloc_chk(sizeof(HKEY), "label_hashkey");
    key->type = CHARS;
    key->val.s = strdup_chk(value, "label_hashkey->value");
    return key;
}
 
unsigned labelhash(const char *prog, const char *label)
{
    HKEY *keys[2] = {NULL};
    int i = 0;
    unsigned h = 0;
 
    if(prog[0]) {
        keys[i++] = label_hashkey(prog);
    }
    keys[i] = label_hashkey(label);
    h = hash(i+1, keys, LABELTABSIZE);
    for(int j = 0; j < i + 1; j++) {
        FREE(keys[j]->val.s);
        FREE(keys[j]);
    }
    return h;
}
 
int compare_adr(const void *a, const void *b)
{
    return (**(LABELARRAY **)a).adr - (**(LABELARRAY **)b).adr;
}
 
/* assemble.hで定義された関数群 */
void addcerrlist_label()
{
    addcerrlist(ARRAYSIZE(cerr_label), cerr_label);
}
 
WORD getlabel(const char *prog, const char *label)
{
    assert(prog != NULL && label != NULL);
    LABELTAB *p = NULL;
    LABELARRAY *l = NULL;
 
    for(p = labels[labelhash(prog, label)]; p != NULL; p = p->next) {
        l = p->label;
        if((!prog[0] || (strcmp(prog, l->prog) == 0)) &&
           strcmp(label, l->label) == 0)
        {
            return l->adr;
        }
    }
    return 0xFFFF;
}
 
bool addlabel(const char *prog, const char *label, WORD adr)
{
    assert(label != NULL);
    LABELTAB *p = NULL;
    LABELARRAY *l = NULL;
    unsigned h = 0;
 
    /* 登録されたラベルを検索。すでに登録されている場合はエラー発生 */
    if(getlabel(prog, label) != 0xFFFF) {
        setcerr(101, label);    /* label already defined */
        return false;
    }
    /* メモリを確保 */
    p = malloc_chk(sizeof(LABELTAB), "labels.next");
    l = p->label = malloc_chk(sizeof(LABELARRAY), "labels.label");
    /* プログラム名を設定 */
    l->prog = strdup_chk(prog, "label.prog");
    /* ラベルを設定 */
    l->label = strdup_chk(label, "label.label");
    /* アドレスを設定 */
    l->adr = adr;
    /* ラベル数を設定 */
    labelcnt++;
    /* ハッシュ表へ追加 */
    p->next = labels[h = labelhash(prog, label)];
    labels[h] = p;
    return true;
}
 
void printlabel()
{
    int s = 0;
    LABELTAB *p = NULL;
    LABELARRAY **l = {NULL};
 
    l = calloc_chk(labelcnt, sizeof(LABELARRAY **), "labels");
    for(int i = 0; i < LABELTABSIZE; i++) {
        for(p = labels[i]; p != NULL; p = p->next) {
            assert(p->label != NULL);
            l[s++] = p->label;
        }
    }
    qsort(l, s, sizeof(*l), compare_adr);
    for(int i = 0; i < s; i++) {
        if(l[i]->prog[0]) {
            fprintf(stdout, "%s.", l[i]->prog);
        }
        fprintf(stdout, "%s ---> #%04X\n", l[i]->label, l[i]->adr);
    }
    FREE(l);
}
 
void freelabel()
{
    int i;
    LABELTAB *p = NULL;
    LABELTAB *q = NULL;
 
    for(i = 0; i < LABELTABSIZE; i++) {
        for(p = labels[i]; p != NULL; p = q) {
            q = p->next;
            FREE(p->label->prog);
            FREE(p->label->label);
            FREE(p->label);
            FREE(p);
        }
        labels[i] = NULL;
    }
}