diff --git a/src/oberon.c b/src/oberon.c
index 50429645b22a713480253b1fb262128dc1b97af6..064cfb10bd0b24955eb0b23655c12ee68d62cf52 100644 (file)
--- a/src/oberon.c
+++ b/src/oberon.c
EXIT,
LBRACE,
RBRACE,
- DOTDOT
+ DOTDOT,
+ CASE,
+ BAR,
+ WITH
};
// =======================================================================
{
ctx -> token = EXIT;
}
+ else if(strcmp(ident, "CASE") == 0)
+ {
+ ctx -> token = CASE;
+ }
+ else if(strcmp(ident, "WITH") == 0)
+ {
+ ctx -> token = WITH;
+ }
}
+#define ISHEXDIGIT(x) \
+ (((x) >= '0' && (x) <= '9') || ((x) >= 'A' && (x) <= 'F'))
+
static void
oberon_read_number(oberon_context_t * ctx)
{
end_i = ctx -> code_index;
- if(isxdigit(ctx -> c))
+ if(ISHEXDIGIT(ctx -> c))
{
mode = 1;
- while(isxdigit(ctx -> c))
+ while(ISHEXDIGIT(ctx -> c))
{
oberon_get_char(ctx);
}
ctx -> token = RBRACE;
oberon_get_char(ctx);
break;
+ case '|':
+ ctx -> token = BAR;
+ oberon_get_char(ctx);
+ break;
default:
oberon_error(ctx, "invalid char %c", ctx -> c);
break;
@@ -1091,6 +1109,7 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
// Допускается:
// Если классы типов равны
// Если INTEGER переводится в REAL
+ // Есди STRING переводится в CHAR
// Есди STRING переводится в ARRAY OF CHAR
oberon_check_src(ctx, expr);
@@ -1103,7 +1122,21 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
if(expr -> result -> class == OBERON_TYPE_STRING)
{
- if(pref -> class == OBERON_TYPE_ARRAY)
+ if(pref -> class == OBERON_TYPE_CHAR)
+ {
+ if(expr -> is_item && expr -> item.mode == MODE_STRING)
+ {
+ if(strlen(expr -> item.string) != 1)
+ {
+ error = true;
+ }
+ }
+ else
+ {
+ error = true;
+ }
+ }
+ else if(pref -> class == OBERON_TYPE_ARRAY)
{
if(pref -> base -> class != OBERON_TYPE_CHAR)
{
@@ -1133,7 +1166,16 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
oberon_error(ctx, "oberon_autocast_to: incompatible types");
}
- if(pref -> class == OBERON_TYPE_INTEGER || pref -> class == OBERON_TYPE_REAL)
+ if(pref -> class == OBERON_TYPE_CHAR)
+ {
+ if(expr -> result -> class == OBERON_TYPE_STRING)
+ {
+ int c = expr -> item.string[0];
+ expr = oberon_new_item(MODE_CHAR, ctx -> char_type, true);
+ expr -> item.integer = c;
+ }
+ }
+ else if(pref -> class == OBERON_TYPE_INTEGER || pref -> class == OBERON_TYPE_REAL)
{
if(expr -> result -> size > pref -> size)
{
{
if(param -> class == OBERON_CLASS_VAR_PARAM)
{
+ if(arg -> result != param -> type)
+ {
+ oberon_error(ctx, "incompatible type");
+ }
if(arg -> read_only)
{
oberon_error(ctx, "assign to read-only var");
}
+ casted[i] = arg;
+ }
+ else
+ {
+ casted[i] = oberon_autocast_to(ctx, arg, param -> type);
}
- casted[i] = oberon_autocast_to(ctx, arg, param -> type);
arg = arg -> next;
param = param -> next;
}
}
static oberon_expr_t *
-oberon_designator(oberon_context_t * ctx)
+oberon_qualident_expr(oberon_context_t * ctx)
{
- char * name;
oberon_object_t * var;
oberon_expr_t * expr;
oberon_error(ctx, "invalid designator");
break;
}
+
expr -> item.var = var;
+ return expr;
+}
+
+static oberon_expr_t *
+oberon_designator(oberon_context_t * ctx)
+{
+ char * name;
+ oberon_expr_t * expr;
+
+ expr = oberon_qualident_expr(ctx);
+
while(expr -> result -> class != OBERON_TYPE_PROCEDURE && ISSELECTOR(ctx -> token))
{
switch(ctx -> token)
@@ -1814,7 +1875,22 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
oberon_type_t * result;
bool error = false;
- if(token == IS)
+ if(token == IN)
+ {
+ if(a -> result -> class != OBERON_TYPE_INTEGER)
+ {
+ oberon_error(ctx, "must be integer");
+ }
+
+ if(b -> result -> class != OBERON_TYPE_SET)
+ {
+ oberon_error(ctx, "must be set");
+ }
+
+ result = ctx -> bool_type;
+ expr = oberon_new_operator(OP_IN, result, a, b);
+ }
+ else if(token == IS)
{
oberon_type_t * v = a -> result;
if(v -> class == OBERON_TYPE_POINTER)
return expr;
}
-static oberon_item_t *
-oberon_const_expr(oberon_context_t * ctx)
+static void
+oberon_check_const(oberon_context_t * ctx, oberon_expr_t * expr)
{
- oberon_expr_t * expr;
- expr = oberon_expr(ctx);
-
if(expr -> is_item == 0)
{
oberon_error(ctx, "const expression are required");
oberon_error(ctx, "const expression are required");
break;
}
+}
+static oberon_item_t *
+oberon_const_expr(oberon_context_t * ctx)
+{
+ oberon_expr_t * expr;
+ expr = oberon_expr(ctx);
+ oberon_check_const(ctx, expr);
return (oberon_item_t *) expr;
}
signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
oberon_opt_formal_pars(ctx, &signature);
- oberon_initialize_decl(ctx);
+ //oberon_initialize_decl(ctx);
oberon_generator_init_type(ctx, signature);
oberon_close_scope(ctx -> decl);
oberon_object_t * proc;
proc = oberon_find_object(ctx -> decl, name, 0);
- if(proc != NULL)
+ if(proc == NULL)
+ {
+ proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC, export, read_only, false);
+ proc -> type = signature;
+ proc -> scope = proc_scope;
+ oberon_generator_init_proc(ctx, proc);
+ }
+ else
{
if(proc -> class != OBERON_CLASS_PROC)
{
oberon_compare_signatures(ctx, proc -> type, signature);
}
- else
+
+ proc_scope -> parent = proc;
+ oberon_object_t * param = proc_scope -> list -> next;
+ while(param)
{
- proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC, export, read_only, false);
- proc -> type = signature;
- proc -> scope = proc_scope;
- oberon_generator_init_proc(ctx, proc);
+ param -> parent = proc;
+ param = param -> next;
}
- proc -> scope -> parent = proc;
-
if(forward == 0)
{
proc -> linked = 1;
@@ -3156,6 +3242,167 @@ oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
oberon_generate_assign(ctx, src, dst);
}
+static oberon_expr_t *
+oberon_case_labels(oberon_context_t * ctx, oberon_expr_t * val)
+{
+ oberon_expr_t * e1;
+ oberon_expr_t * e2;
+ oberon_expr_t * cond;
+ oberon_expr_t * cond2;
+
+ e1 = (oberon_expr_t *) oberon_const_expr(ctx);
+ oberon_autocast_to(ctx, e1, val -> result);
+
+ e2 = NULL;
+ if(ctx -> token == DOTDOT)
+ {
+ oberon_assert_token(ctx, DOTDOT);
+ e2 = (oberon_expr_t *) oberon_const_expr(ctx);
+ oberon_autocast_to(ctx, e2, val -> result);
+ }
+
+ if(e2 == NULL)
+ {
+ /* val == e1 */
+ cond = oberon_make_bin_op(ctx, EQUAL, val, e1);
+ }
+ else
+ {
+ /* val >= e1 && val <= e2 */
+ cond = oberon_make_bin_op(ctx, GEQ, val, e1);
+ cond2 = oberon_make_bin_op(ctx, LEQ, val, e2);
+ cond = oberon_make_bin_op(ctx, AND, cond, cond2);
+ }
+
+ return cond;
+}
+
+static void
+oberon_case(oberon_context_t * ctx, oberon_expr_t * val, gen_label_t * end)
+{
+ oberon_expr_t * cond;
+ oberon_expr_t * cond2;
+ gen_label_t * this_end;
+
+ if(ISEXPR(ctx -> token))
+ {
+ this_end = oberon_generator_reserve_label(ctx);
+
+ cond = oberon_case_labels(ctx, val);
+ while(ctx -> token == COMMA)
+ {
+ oberon_assert_token(ctx, COMMA);
+ /* cond || cond2 */
+ cond2 = oberon_case_labels(ctx, val);
+ cond = oberon_make_bin_op(ctx, OR, cond, cond2);
+ }
+ oberon_assert_token(ctx, COLON);
+
+ oberon_generate_branch(ctx, cond, false, this_end);
+ oberon_statement_seq(ctx);
+ oberon_generate_goto(ctx, end);
+
+ oberon_generate_label(ctx, this_end);
+ }
+}
+
+static void
+oberon_case_statement(oberon_context_t * ctx)
+{
+ oberon_expr_t * val;
+ oberon_expr_t * expr;
+ gen_label_t * end;
+
+ end = oberon_generator_reserve_label(ctx);
+
+ oberon_assert_token(ctx, CASE);
+ expr = oberon_expr(ctx);
+ val = oberon_make_temp_var_item(ctx, expr -> result);
+ oberon_assign(ctx, expr, val);
+ oberon_assert_token(ctx, OF);
+ oberon_case(ctx, val, end);
+ while(ctx -> token == BAR)
+ {
+ oberon_assert_token(ctx, BAR);
+ oberon_case(ctx, val, end);
+ }
+
+ if(ctx -> token == ELSE)
+ {
+ oberon_assert_token(ctx, ELSE);
+ oberon_statement_seq(ctx);
+ }
+
+ oberon_generate_label(ctx, end);
+ oberon_assert_token(ctx, END);
+}
+
+static void
+oberon_with_guard_do(oberon_context_t * ctx, gen_label_t * end)
+{
+ oberon_expr_t * val;
+ oberon_expr_t * var;
+ oberon_expr_t * type;
+ oberon_expr_t * cond;
+ oberon_expr_t * cast;
+ oberon_type_t * old_type;
+ gen_var_t * old_var;
+ gen_label_t * this_end;
+
+ this_end = oberon_generator_reserve_label(ctx);
+
+ var = oberon_qualident_expr(ctx);
+ oberon_assert_token(ctx, COLON);
+ type = oberon_qualident_expr(ctx);
+ cond = oberon_make_bin_op(ctx, IS, var, type);
+
+ oberon_assert_token(ctx, DO);
+ oberon_generate_branch(ctx, cond, false, this_end);
+
+ /* Сохраняем ссылку во временной переменной */
+ val = oberon_make_temp_var_item(ctx, type -> result);
+ cast = oberno_make_record_cast(ctx, var, type -> result);
+ oberon_assign(ctx, cast, val);
+ /* Подменяем тип у оригинальной переменной */
+ old_type = var -> item.var -> type;
+ var -> item.var -> type = type -> result;
+ /* Подменяем ссылку на переменную */
+ old_var = var -> item.var -> gen_var;
+ var -> item.var -> gen_var = val -> item.var -> gen_var;
+
+ oberon_statement_seq(ctx);
+ oberon_generate_goto(ctx, end);
+ oberon_generate_label(ctx, this_end);
+
+ /* Возвращаем исходное состояние */
+ var -> item.var -> gen_var = old_var;
+ var -> item.var -> type = old_type;
+}
+
+static void
+oberon_with_statement(oberon_context_t * ctx)
+{
+ gen_label_t * end;
+ end = oberon_generator_reserve_label(ctx);
+
+ oberon_assert_token(ctx, WITH);
+ oberon_with_guard_do(ctx, end);
+ while(ctx -> token == BAR)
+ {
+ oberon_assert_token(ctx, BAR);
+ oberon_with_guard_do(ctx, end);
+ }
+
+ if(ctx -> token == ELSE)
+ {
+ oberon_assert_token(ctx, ELSE);
+ oberon_statement_seq(ctx);
+ }
+
+ oberon_generate_label(ctx, end);
+ oberon_assert_token(ctx, END);
+}
+
static void
oberon_statement(oberon_context_t * ctx)
{
}
oberon_generate_goto(ctx, ctx -> decl -> exit_label);
}
+ else if(ctx -> token == CASE)
+ {
+ oberon_case_statement(ctx);
+ }
+ else if(ctx -> token == WITH)
+ {
+ oberon_with_statement(ctx);
+ }
else if(ctx -> token == RETURN)
{
oberon_assert_token(ctx, RETURN);
oberon_assert_token(ctx, END);
name2 = oberon_assert_ident(ctx);
- oberon_assert_token(ctx, DOT);
+ oberon_expect_token(ctx, DOT);
if(strcmp(name1, name2) != 0)
{