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-rw-r--r--miscutils/bc.c108
1 files changed, 51 insertions, 57 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c
index 56a2bca..9f23a06 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -3556,6 +3556,18 @@ static void bc_parse_pushIndex(BcParse *p, size_t idx)
}
}
+static void bc_parse_pushJUMP(BcParse *p, size_t idx)
+{
+ bc_parse_push(p, BC_INST_JUMP);
+ bc_parse_pushIndex(p, idx);
+}
+
+static void bc_parse_pushJUMP_ZERO(BcParse *p, size_t idx)
+{
+ bc_parse_push(p, BC_INST_JUMP_ZERO);
+ bc_parse_pushIndex(p, idx);
+}
+
static void bc_parse_number(BcParse *p)
{
char *num = xstrdup(p->l.t.v.v);
@@ -3677,14 +3689,19 @@ static BC_STATUS zbc_parse_stmt(BcParse *p)
# define zbc_parse_stmt(...) (zbc_parse_stmt(__VA_ARGS__), BC_STATUS_SUCCESS)
#endif
-static BC_STATUS zbc_parse_stmt_fail_if_bare_NLINE(BcParse *p, bool auto_allowed, const char *after_X)
+static BC_STATUS zbc_parse_stmt_allow_NLINE_before(BcParse *p, const char *after_X)
{
+ // "if(cond)<newline>stmt" is accepted too, but not 2+ newlines.
+ // Same for "else", "while()", "for()".
+ BcStatus s = zbc_lex_next_and_skip_NLINE(&p->l);
+ if (s) RETURN_STATUS(s);
if (p->l.t.t == BC_LEX_NLINE)
RETURN_STATUS(bc_error_fmt("no statement after '%s'", after_X));
- RETURN_STATUS(zbc_parse_stmt_possibly_auto(p, auto_allowed));
+
+ RETURN_STATUS(zbc_parse_stmt(p));
}
#if ERRORS_ARE_FATAL
-# define zbc_parse_stmt_fail_if_bare_NLINE(...) (zbc_parse_stmt_fail_if_bare_NLINE(__VA_ARGS__), BC_STATUS_SUCCESS)
+# define zbc_parse_stmt_allow_NLINE_before(...) (zbc_parse_stmt_allow_NLINE_before(__VA_ARGS__), BC_STATUS_SUCCESS)
#endif
static void bc_parse_operator(BcParse *p, BcLexType type, size_t start,
@@ -4106,11 +4123,16 @@ static BC_STATUS zbc_parse_return(BcParse *p)
# define zbc_parse_return(...) (zbc_parse_return(__VA_ARGS__), BC_STATUS_SUCCESS)
#endif
+static void rewrite_label_to_current(BcParse *p, size_t idx)
+{
+ size_t *label = bc_vec_item(&p->func->labels, idx);
+ *label = p->func->code.len;
+}
+
static BC_STATUS zbc_parse_if(BcParse *p)
{
BcStatus s;
size_t ip_idx;
- size_t *label;
dbg_lex_enter("%s:%d entered", __func__, __LINE__);
s = zbc_lex_next(&p->l);
@@ -4123,45 +4145,35 @@ static BC_STATUS zbc_parse_if(BcParse *p)
if (s) RETURN_STATUS(s);
if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
- // if(cond)<newline>stmt is accepted too (but not 2+ newlines)
- s = zbc_lex_next_and_skip_NLINE(&p->l);
- if (s) RETURN_STATUS(s);
- bc_parse_push(p, BC_INST_JUMP_ZERO);
ip_idx = p->func->labels.len;
- bc_parse_pushIndex(p, ip_idx);
+ bc_parse_pushJUMP_ZERO(p, ip_idx);
bc_vec_push(&p->func->labels, &ip_idx);
- s = zbc_parse_stmt_fail_if_bare_NLINE(p, false, "if");
+ s = zbc_parse_stmt_allow_NLINE_before(p, "if");
if (s) RETURN_STATUS(s);
dbg_lex("%s:%d in if after stmt: p->l.t.t:%d", __func__, __LINE__, p->l.t.t);
if (p->l.t.t == BC_LEX_KEY_ELSE) {
size_t ip2_idx;
- s = zbc_lex_next_and_skip_NLINE(&p->l);
- if (s) RETURN_STATUS(s);
-
ip2_idx = p->func->labels.len;
dbg_lex("%s:%d after if() body: BC_INST_JUMP to %d", __func__, __LINE__, ip2_idx);
- bc_parse_push(p, BC_INST_JUMP);
- bc_parse_pushIndex(p, ip2_idx);
+ bc_parse_pushJUMP(p, ip2_idx);
- label = bc_vec_item(&p->func->labels, ip_idx);
- dbg_lex("%s:%d rewriting 'if_zero' label to jump to 'else': %d -> %d", __func__, __LINE__, *label, p->func->code.len);
- *label = p->func->code.len;
+ dbg_lex("%s:%d rewriting 'if_zero' label to jump to 'else'-> %d", __func__, __LINE__, p->func->code.len);
+ rewrite_label_to_current(p, ip_idx);
bc_vec_push(&p->func->labels, &ip2_idx);
ip_idx = ip2_idx;
- s = zbc_parse_stmt_fail_if_bare_NLINE(p, false, "else");
+ s = zbc_parse_stmt_allow_NLINE_before(p, "else");
if (s) RETURN_STATUS(s);
}
- label = bc_vec_item(&p->func->labels, ip_idx);
- dbg_lex("%s:%d rewriting label to jump after 'if' body: %d -> %d", __func__, __LINE__, *label, p->func->code.len);
- *label = p->func->code.len;
+ dbg_lex("%s:%d rewriting label to jump after 'if' body-> %d", __func__, __LINE__, p->func->code.len);
+ rewrite_label_to_current(p, ip_idx);
dbg_lex_done("%s:%d done", __func__, __LINE__);
RETURN_STATUS(s);
@@ -4173,7 +4185,6 @@ static BC_STATUS zbc_parse_if(BcParse *p)
static BC_STATUS zbc_parse_while(BcParse *p)
{
BcStatus s;
- size_t *label;
size_t cond_idx;
size_t ip_idx;
@@ -4196,23 +4207,16 @@ static BC_STATUS zbc_parse_while(BcParse *p)
if (s) RETURN_STATUS(s);
if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
- // while(cond)<newline>stmt is accepted too
- s = zbc_lex_next_and_skip_NLINE(&p->l);
- if (s) RETURN_STATUS(s);
+ bc_parse_pushJUMP_ZERO(p, ip_idx);
- bc_parse_push(p, BC_INST_JUMP_ZERO);
- bc_parse_pushIndex(p, ip_idx);
-
- s = zbc_parse_stmt_fail_if_bare_NLINE(p, false, "while");
+ s = zbc_parse_stmt_allow_NLINE_before(p, "while");
if (s) RETURN_STATUS(s);
dbg_lex("%s:%d BC_INST_JUMP to %d", __func__, __LINE__, cond_idx);
- bc_parse_push(p, BC_INST_JUMP);
- bc_parse_pushIndex(p, cond_idx);
+ bc_parse_pushJUMP(p, cond_idx);
- label = bc_vec_item(&p->func->labels, ip_idx);
- dbg_lex("%s:%d rewriting label: %d -> %d", __func__, __LINE__, *label, p->func->code.len);
- *label = p->func->code.len;
+ dbg_lex("%s:%d rewriting label-> %d", __func__, __LINE__, p->func->code.len);
+ rewrite_label_to_current(p, ip_idx);
bc_vec_pop(&p->exits);
bc_vec_pop(&p->conds);
@@ -4226,7 +4230,6 @@ static BC_STATUS zbc_parse_while(BcParse *p)
static BC_STATUS zbc_parse_for(BcParse *p)
{
BcStatus s;
- size_t *label;
size_t cond_idx, exit_idx, body_idx, update_idx;
dbg_lex("%s:%d p->l.t.t:%d", __func__, __LINE__, p->l.t.t);
@@ -4264,10 +4267,8 @@ static BC_STATUS zbc_parse_for(BcParse *p)
s = zbc_lex_next(&p->l);
if (s) RETURN_STATUS(s);
- bc_parse_push(p, BC_INST_JUMP_ZERO);
- bc_parse_pushIndex(p, exit_idx);
- bc_parse_push(p, BC_INST_JUMP);
- bc_parse_pushIndex(p, body_idx);
+ bc_parse_pushJUMP_ZERO(p, exit_idx);
+ bc_parse_pushJUMP(p, body_idx);
bc_vec_push(&p->conds, &update_idx);
bc_vec_push(&p->func->labels, &p->func->code.len);
@@ -4280,28 +4281,20 @@ static BC_STATUS zbc_parse_for(BcParse *p)
if (s) RETURN_STATUS(s);
if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
- bc_parse_push(p, BC_INST_JUMP);
- bc_parse_pushIndex(p, cond_idx);
+ bc_parse_pushJUMP(p, cond_idx);
bc_vec_push(&p->func->labels, &p->func->code.len);
bc_vec_push(&p->exits, &exit_idx);
bc_vec_push(&p->func->labels, &exit_idx);
- // for(...)<newline>stmt is accepted as well
- s = zbc_lex_next_and_skip_NLINE(&p->l);
- if (s) RETURN_STATUS(s);
-
- s = zbc_parse_stmt_fail_if_bare_NLINE(p, false, "for");
+ s = zbc_parse_stmt_allow_NLINE_before(p, "for");
if (s) RETURN_STATUS(s);
-//TODO: commonalize?
dbg_lex("%s:%d BC_INST_JUMP to %d", __func__, __LINE__, update_idx);
- bc_parse_push(p, BC_INST_JUMP);
- bc_parse_pushIndex(p, update_idx);
+ bc_parse_pushJUMP(p, update_idx);
- label = bc_vec_item(&p->func->labels, exit_idx);
- dbg_lex("%s:%d rewriting label: %d -> %d", __func__, __LINE__, *label, p->func->code.len);
- *label = p->func->code.len;
+ dbg_lex("%s:%d rewriting label-> %d", __func__, __LINE__, p->func->code.len);
+ rewrite_label_to_current(p, exit_idx);
bc_vec_pop(&p->exits);
bc_vec_pop(&p->conds);
@@ -4325,8 +4318,7 @@ static BC_STATUS zbc_parse_break_or_continue(BcParse *p, BcLexType type)
i = *(size_t*)bc_vec_top(&p->conds);
}
- bc_parse_push(p, BC_INST_JUMP);
- bc_parse_pushIndex(p, i);
+ bc_parse_pushJUMP(p, i);
s = zbc_lex_next(&p->l);
if (s) RETURN_STATUS(s);
@@ -4407,10 +4399,12 @@ static BC_STATUS zbc_parse_funcdef(BcParse *p)
// Prevent "define z()<newline>" from being interpreted as function with empty stmt as body
s = zbc_lex_skip_if_at_NLINE(&p->l);
if (s) RETURN_STATUS(s);
-//TODO: GNU bc requires a {} block even if function body has single stmt, enforce this?
+ //GNU bc requires a {} block even if function body has single stmt, enforce this?
+ if (p->l.t.t != BC_LEX_LBRACE)
+ RETURN_STATUS(bc_error("function { body } expected"));
p->in_funcdef++; // to determine whether "return" stmt is allowed, and such
- s = zbc_parse_stmt_fail_if_bare_NLINE(p, true, "define");
+ s = zbc_parse_stmt_possibly_auto(p, true);
p->in_funcdef--;
if (s) RETURN_STATUS(s);
generated by cgit v1.1 at 2024-11-07 09:53:14 +0000