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implement break and continue. only loops covered for now, but that's because

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switch isn't implemented yet
This commit is contained in:
Bill Currie 2001-10-24 18:57:29 +00:00
parent 552a486d87
commit 133ce647fb
3 changed files with 69 additions and 26 deletions
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2
tools/qfcc/TODO
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@ -14,7 +14,7 @@ X move the chained funcion support out of emit_function_expr into
X pre- and post- increment operators (++ and --)
I gut out old parser
o switch/case, for any type
o break/continue keywords for switch() and for(;;)
X break/continue keywords for switch() and for(;;)
o quaternion type. Tricky: requires 4 word args/return
o CSE optimisations
X full scoping

2
tools/qfcc/source/qc-lex.l
View file

@ -220,6 +220,8 @@ static keyword_t keywords[] = {
{"if", IF, 0, PROG_ID_VERSION},
{"else", ELSE, 0, PROG_ID_VERSION},
{"for", FOR, 0, PROG_ID_VERSION},
{"break", BREAK, 0, PROG_ID_VERSION},
{"continue", CONTINUE, 0, PROG_ID_VERSION},
{"NIL", NIL, 0, PROG_ID_VERSION},
};

91
tools/qfcc/source/qc-parse.y
View file

@ -103,13 +103,14 @@ typedef struct {
%token <vector_val> VECTOR_VAL
%token <quaternion_val> QUATERNION_VAL
%token LOCAL RETURN WHILE DO IF ELSE FOR ELIPSIS NIL
%token LOCAL RETURN WHILE DO IF ELSE FOR BREAK CONTINUE ELIPSIS NIL
%token <type> TYPE
%type <type> type maybe_func
%type <def> param param_list def_item def_list def_name
%type <expr> const opt_expr expr arg_list
%type <expr> statement statements statement_block
%type <expr> break_label continue_label
%type <function> begin_function
%type <def_list> save_inits
@ -122,6 +123,8 @@ def_t *current_def;
def_t param_scope;
function_t *current_func;
expr_t *local_expr;
expr_t *break_label;
expr_t *continue_label;
def_t *pr_scope; // the function being parsed, or NULL
string_t s_file; // filename for function definition
@ -404,38 +407,59 @@ statement
{
$$ = return_expr (current_func, 0);
}
| WHILE '(' expr ')' save_inits statement
| BREAK ';'
{
if (break_label)
$$ = new_unary_expr ('g', break_label);
else
$$ = error (0, "break outside of loop or switch");
}
| CONTINUE ';'
{
if (continue_label)
$$ = new_unary_expr ('g', continue_label);
else
$$ = error (0, "continue outside of loop");
}
| WHILE break_label continue_label '(' expr ')' save_inits statement
{
expr_t *l1 = new_label_expr ();
expr_t *l2 = new_label_expr ();
expr_t *l2 = break_label;
expr_t *e;
restore_local_inits ($5);
free_local_inits ($5);
restore_local_inits ($7);
free_local_inits ($7);
$$ = new_block_expr ();
e = new_binary_expr ('n', test_expr ($3, 1), l2);
e->line = $3->line;
e->file = $3->file;
e = new_binary_expr ('n', test_expr ($5, 1), l2);
e->line = $5->line;
e->file = $5->file;
append_expr ($$, e);
append_expr ($$, l1);
append_expr ($$, $6);
e = new_binary_expr ('i', test_expr ($3, 1), l1);
e->line = $3->line;
e->file = $3->file;
append_expr ($$, $8);
append_expr ($$, continue_label);
e = new_binary_expr ('i', test_expr ($5, 1), l1);
e->line = $5->line;
e->file = $5->file;
append_expr ($$, e);
append_expr ($$, l2);
break_label = $2;
continue_label = $3;
}
| DO statement WHILE '(' expr ')' ';'
| DO break_label continue_label statement WHILE '(' expr ')' ';'
{
expr_t *l1 = new_label_expr ();
$$ = new_block_expr ();
append_expr ($$, l1);
append_expr ($$, $2);
append_expr ($$, new_binary_expr ('i', test_expr ($5, 1), l1));
append_expr ($$, $4);
append_expr ($$, continue_label);
append_expr ($$, new_binary_expr ('i', test_expr ($7, 1), l1));
append_expr ($$, break_label);
break_label = $2;
continue_label = $3;
}
| LOCAL type
{
@ -503,25 +527,28 @@ statement
free_local_inits (else_ini);
free_local_inits ($<def_list>8);
}
| FOR '(' opt_expr ';' opt_expr ';' opt_expr ')' save_inits statement
| FOR break_label continue_label '(' opt_expr ';' opt_expr ';' opt_expr ')' save_inits statement
{
expr_t *l1 = new_label_expr ();
expr_t *l2 = new_label_expr ();
expr_t *l2 = break_label;
restore_local_inits ($9);
free_local_inits ($9);
restore_local_inits ($11);
free_local_inits ($11);
$$ = new_block_expr ();
append_expr ($$, $3);
if ($5)
append_expr ($$, new_binary_expr ('n', test_expr ($5, 1), l2));
append_expr ($$, $5);
if ($7)
append_expr ($$, new_binary_expr ('n', test_expr ($7, 1), l2));
append_expr ($$, l1);
append_expr ($$, $10);
append_expr ($$, $7);
append_expr ($$, $12);
append_expr ($$, continue_label);
append_expr ($$, $9);
if ($5)
append_expr ($$, new_binary_expr ('i', test_expr ($5, 1), l1));
append_expr ($$, new_binary_expr ('i', test_expr ($7, 1), l1));
append_expr ($$, l2);
break_label = $2;
continue_label = $3;
}
| expr ';'
{
@ -529,6 +556,20 @@ statement
}
;
break_label
: /* empty */
{
$$ = break_label;
break_label = new_label_expr ();
}
continue_label
: /* empty */
{
$$ = continue_label;
continue_label = new_label_expr ();
}
save_inits
: /* empty */
{