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asm: implement $-prefixed label references for branch instructions

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max 🍓
2025-05-12 15:49:27 +01:00
parent 497ba65440
commit c1ba6e78bc
3 changed files with 67 additions and 4 deletions
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44
asm/lex.c
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@@ -47,7 +47,6 @@ static struct lex_token_def symbols[] = {
LEX_TOKEN_DEF(IVY_ASM_SYM_RIGHT_BRACE, "}"),
LEX_TOKEN_DEF(IVY_ASM_SYM_COLON, ":"),
LEX_TOKEN_DEF(IVY_ASM_SYM_SEMICOLON, ";"),
LEX_TOKEN_DEF(IVY_ASM_SYM_DOLLAR, "$"),
LEX_TOKEN_DEF(IVY_ASM_SYM_HYPHEN, "-"),
LEX_TOKEN_DEF(IVY_ASM_SYM_SQUOTE, "'"),
LEX_TOKEN_DEF(IVY_ASM_SYM_DQUOTE, "\""),
@@ -853,6 +852,43 @@ static enum ivy_status read_keyword(struct ivy_asm_lexer *lex)
return push_keyword(lex, keyword);
}
static enum ivy_status read_label_ref(struct ivy_asm_lexer *lex)
{
advance(lex);
b_string *str = get_temp_string(lex);
bool label = false;
while (true) {
int c = peek(lex);
if (c < 0) {
break;
}
if (c == ':' && peek_next(lex) != ':') {
advance(lex);
label = true;
break;
}
if (!isalnum(c) && c != '_') {
break;
}
char s[2] = {c, 0};
b_string_append_cstr(str, s);
advance(lex);
}
const char *s = b_string_ptr(str);
struct ivy_asm_token *tok = create_token(IVY_ASM_TOK_LABEL_REF);
tok->t_str = b_string_steal(str);
return push_token(lex, tok);
}
static enum ivy_status read_ident(struct ivy_asm_lexer *lex)
{
b_string *str = get_temp_string(lex);
@@ -942,6 +978,10 @@ static enum ivy_status pump_tokens(struct ivy_asm_lexer *lex)
return read_symbol(lex);
}
if (c == '$') {
return read_label_ref(lex);
}
if (c == '@') {
return read_keyword(lex);
}
@@ -1018,6 +1058,7 @@ const char *ivy_asm_token_type_to_string(enum ivy_asm_token_type type)
ENUM_STR(IVY_ASM_TOK_INT);
ENUM_STR(IVY_ASM_TOK_DOUBLE);
ENUM_STR(IVY_ASM_TOK_LABEL);
ENUM_STR(IVY_ASM_TOK_LABEL_REF);
ENUM_STR(IVY_ASM_TOK_IDENT);
ENUM_STR(IVY_ASM_TOK_STRING);
ENUM_STR(IVY_ASM_TOK_LINEFEED);
@@ -1064,7 +1105,6 @@ const char *ivy_asm_symbol_to_string(enum ivy_asm_symbol sym)
ENUM_STR(IVY_ASM_SYM_HYPHEN);
ENUM_STR(IVY_ASM_SYM_COMMA);
ENUM_STR(IVY_ASM_SYM_SEMICOLON);
ENUM_STR(IVY_ASM_SYM_DOLLAR);
ENUM_STR(IVY_ASM_SYM_FORWARD_SLASH_ASTERISK);
default:
return "";