/* Modula 2 language support routines for GDB, the GNU debugger.
- Copyright (C) 1992-2020 Free Software Foundation, Inc.
+ Copyright (C) 1992-2021 Free Software Foundation, Inc.
This file is part of GDB.
#include "c-lang.h"
#include "valprint.h"
#include "gdbarch.h"
+#include "m2-exp.h"
-static void m2_printchar (int, struct type *, struct ui_file *);
+/* A helper function for UNOP_HIGH. */
-/* FIXME: This is a copy of the same function from c-exp.y. It should
- be replaced with a true Modula version. */
-
-static void
-m2_printchar (int c, struct type *type, struct ui_file *stream)
+struct value *
+eval_op_m2_high (struct type *expect_type, struct expression *exp,
+ enum noside noside,
+ struct value *arg1)
{
- fputs_filtered ("'", stream);
- LA_EMIT_CHAR (c, type, stream, '\'');
- fputs_filtered ("'", stream);
-}
-
-static struct value *
-evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
- int *pos, enum noside noside)
-{
- enum exp_opcode op = exp->elts[*pos].opcode;
- struct value *arg1;
- struct value *arg2;
- struct type *type;
-
- switch (op)
+ if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ return arg1;
+ else
{
- case UNOP_HIGH:
- (*pos)++;
- arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
-
- if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
- return arg1;
- else
- {
- arg1 = coerce_ref (arg1);
- type = check_typedef (value_type (arg1));
-
- if (m2_is_unbounded_array (type))
- {
- struct value *temp = arg1;
-
- type = type->field (1).type ();
- /* i18n: Do not translate the "_m2_high" part! */
- arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL,
- _("unbounded structure "
- "missing _m2_high field"));
-
- if (value_type (arg1) != type)
- arg1 = value_cast (type, arg1);
- }
- }
- return arg1;
-
- case BINOP_SUBSCRIPT:
- (*pos)++;
- arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
- arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
- if (noside == EVAL_SKIP)
- goto nosideret;
- /* If the user attempts to subscript something that is not an
- array or pointer type (like a plain int variable for example),
- then report this as an error. */
-
arg1 = coerce_ref (arg1);
- type = check_typedef (value_type (arg1));
+ struct type *type = check_typedef (value_type (arg1));
if (m2_is_unbounded_array (type))
{
struct value *temp = arg1;
- type = type->field (0).type ();
- if (type == NULL || (type->code () != TYPE_CODE_PTR))
- {
- warning (_("internal error: unbounded "
- "array structure is unknown"));
- return evaluate_subexp_standard (expect_type, exp, pos, noside);
- }
- /* i18n: Do not translate the "_m2_contents" part! */
- arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
+
+ type = type->field (1).type ();
+ /* i18n: Do not translate the "_m2_high" part! */
+ arg1 = value_struct_elt (&temp, {}, "_m2_high", NULL,
_("unbounded structure "
- "missing _m2_contents field"));
-
+ "missing _m2_high field"));
+
if (value_type (arg1) != type)
arg1 = value_cast (type, arg1);
-
- check_typedef (value_type (arg1));
- return value_ind (value_ptradd (arg1, value_as_long (arg2)));
}
- else
- if (type->code () != TYPE_CODE_ARRAY)
- {
- if (type->name ())
- error (_("cannot subscript something of type `%s'"),
- type->name ());
- else
- error (_("cannot subscript requested type"));
- }
-
- if (noside == EVAL_AVOID_SIDE_EFFECTS)
- return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
- else
- return value_subscript (arg1, value_as_long (arg2));
-
- default:
- return evaluate_subexp_standard (expect_type, exp, pos, noside);
}
-
- nosideret:
- return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
+ return arg1;
}
-\f
-/* Table of operators and their precedences for printing expressions. */
+/* A helper function for BINOP_SUBSCRIPT. */
-static const struct op_print m2_op_print_tab[] =
+struct value *
+eval_op_m2_subscript (struct type *expect_type, struct expression *exp,
+ enum noside noside,
+ struct value *arg1, struct value *arg2)
{
- {"+", BINOP_ADD, PREC_ADD, 0},
- {"+", UNOP_PLUS, PREC_PREFIX, 0},
- {"-", BINOP_SUB, PREC_ADD, 0},
- {"-", UNOP_NEG, PREC_PREFIX, 0},
- {"*", BINOP_MUL, PREC_MUL, 0},
- {"/", BINOP_DIV, PREC_MUL, 0},
- {"DIV", BINOP_INTDIV, PREC_MUL, 0},
- {"MOD", BINOP_REM, PREC_MUL, 0},
- {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
- {"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
- {"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
- {"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
- {"=", BINOP_EQUAL, PREC_EQUAL, 0},
- {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
- {"<=", BINOP_LEQ, PREC_ORDER, 0},
- {">=", BINOP_GEQ, PREC_ORDER, 0},
- {">", BINOP_GTR, PREC_ORDER, 0},
- {"<", BINOP_LESS, PREC_ORDER, 0},
- {"^", UNOP_IND, PREC_PREFIX, 0},
- {"@", BINOP_REPEAT, PREC_REPEAT, 0},
- {"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0},
- {"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0},
- {"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0},
- {"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0},
- {"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0},
- {"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0},
- {"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0},
- {"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0},
- {"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0},
- {NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0}
-};
-\f
-/* The built-in types of Modula-2. */
-
-enum m2_primitive_types {
- m2_primitive_type_char,
- m2_primitive_type_int,
- m2_primitive_type_card,
- m2_primitive_type_real,
- m2_primitive_type_bool,
- nr_m2_primitive_types
-};
-
-const struct exp_descriptor exp_descriptor_modula2 =
-{
- print_subexp_standard,
- operator_length_standard,
- operator_check_standard,
- op_name_standard,
- dump_subexp_body_standard,
- evaluate_subexp_modula2
-};
-
-/* Constant data describing the M2 language. */
-
-extern const struct language_data m2_language_data =
-{
- case_sensitive_on,
- array_row_major,
- macro_expansion_no,
- &exp_descriptor_modula2,
- m2_op_print_tab, /* expression operators for printing */
- &default_varobj_ops,
-};
-
-/* Class representing the M2 language. */
-
-class m2_language : public language_defn
-{
-public:
- m2_language ()
- : language_defn (language_m2, m2_language_data)
- { /* Nothing. */ }
-
- /* See language.h. */
-
- const char *name () const override
- { return "modula-2"; }
-
- /* See language.h. */
+ /* If the user attempts to subscript something that is not an
+ array or pointer type (like a plain int variable for example),
+ then report this as an error. */
- const char *natural_name () const override
- { return "Modula-2"; }
-
- /* See language.h. */
- void language_arch_info (struct gdbarch *gdbarch,
- struct language_arch_info *lai) const override
- {
- const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
-
- lai->string_char_type = builtin->builtin_char;
- lai->primitive_type_vector
- = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1,
- struct type *);
-
- lai->primitive_type_vector [m2_primitive_type_char]
- = builtin->builtin_char;
- lai->primitive_type_vector [m2_primitive_type_int]
- = builtin->builtin_int;
- lai->primitive_type_vector [m2_primitive_type_card]
- = builtin->builtin_card;
- lai->primitive_type_vector [m2_primitive_type_real]
- = builtin->builtin_real;
- lai->primitive_type_vector [m2_primitive_type_bool]
- = builtin->builtin_bool;
-
- lai->bool_type_symbol = "BOOLEAN";
- lai->bool_type_default = builtin->builtin_bool;
- }
-
- /* See language.h. */
-
- void print_type (struct type *type, const char *varstring,
- struct ui_file *stream, int show, int level,
- const struct type_print_options *flags) const override
- {
- m2_print_type (type, varstring, stream, show, level, flags);
- }
+ arg1 = coerce_ref (arg1);
+ struct type *type = check_typedef (value_type (arg1));
- /* See language.h. */
-
- void value_print_inner
- (struct value *val, struct ui_file *stream, int recurse,
- const struct value_print_options *options) const override
- {
- return m2_value_print_inner (val, stream, recurse, options);
- }
-
- /* See language.h. */
+ if (m2_is_unbounded_array (type))
+ {
+ struct value *temp = arg1;
+ type = type->field (0).type ();
+ if (type == NULL || (type->code () != TYPE_CODE_PTR))
+ error (_("internal error: unbounded "
+ "array structure is unknown"));
+ /* i18n: Do not translate the "_m2_contents" part! */
+ arg1 = value_struct_elt (&temp, {}, "_m2_contents", NULL,
+ _("unbounded structure "
+ "missing _m2_contents field"));
+
+ if (value_type (arg1) != type)
+ arg1 = value_cast (type, arg1);
- int parser (struct parser_state *ps) const override
- {
- return m2_parse (ps);
- }
+ check_typedef (value_type (arg1));
+ return value_ind (value_ptradd (arg1, value_as_long (arg2)));
+ }
+ else
+ if (type->code () != TYPE_CODE_ARRAY)
+ {
+ if (type->name ())
+ error (_("cannot subscript something of type `%s'"),
+ type->name ());
+ else
+ error (_("cannot subscript requested type"));
+ }
- /* See language.h. */
+ if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
+ else
+ return value_subscript (arg1, value_as_long (arg2));
+}
- void emitchar (int ch, struct type *chtype,
- struct ui_file *stream, int quoter) const override
- {
- ch &= 0xFF; /* Avoid sign bit follies. */
+\f
- if (PRINT_LITERAL_FORM (ch))
- {
- if (ch == '\\' || ch == quoter)
- fputs_filtered ("\\", stream);
- fprintf_filtered (stream, "%c", ch);
- }
- else
- {
- switch (ch)
- {
- case '\n':
- fputs_filtered ("\\n", stream);
- break;
- case '\b':
- fputs_filtered ("\\b", stream);
- break;
- case '\t':
- fputs_filtered ("\\t", stream);
- break;
- case '\f':
- fputs_filtered ("\\f", stream);
- break;
- case '\r':
- fputs_filtered ("\\r", stream);
- break;
- case '\033':
- fputs_filtered ("\\e", stream);
- break;
- case '\007':
- fputs_filtered ("\\a", stream);
- break;
- default:
- fprintf_filtered (stream, "\\%.3o", (unsigned int) ch);
- break;
- }
- }
- }
+/* Single instance of the M2 language. */
- /* See language.h. */
+static m2_language m2_language_defn;
- void printchar (int ch, struct type *chtype,
- struct ui_file *stream) const override
- {
- m2_printchar (ch, chtype, stream);
- }
+/* See language.h. */
- /* See language.h. */
+void
+m2_language::language_arch_info (struct gdbarch *gdbarch,
+ struct language_arch_info *lai) const
+{
+ const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
- void printstr (struct ui_file *stream, struct type *elttype,
- const gdb_byte *string, unsigned int length,
- const char *encoding, int force_ellipses,
- const struct value_print_options *options) const override
+ /* Helper function to allow shorter lines below. */
+ auto add = [&] (struct type * t)
{
- unsigned int i;
- unsigned int things_printed = 0;
- int in_quotes = 0;
- int need_comma = 0;
+ lai->add_primitive_type (t);
+ };
- if (length == 0)
- {
- fputs_filtered ("\"\"", gdb_stdout);
- return;
- }
+ add (builtin->builtin_char);
+ add (builtin->builtin_int);
+ add (builtin->builtin_card);
+ add (builtin->builtin_real);
+ add (builtin->builtin_bool);
- for (i = 0; i < length && things_printed < options->print_max; ++i)
- {
- /* Position of the character we are examining
- to see whether it is repeated. */
- unsigned int rep1;
- /* Number of repetitions we have detected so far. */
- unsigned int reps;
-
- QUIT;
-
- if (need_comma)
- {
- fputs_filtered (", ", stream);
- need_comma = 0;
- }
-
- rep1 = i + 1;
- reps = 1;
- while (rep1 < length && string[rep1] == string[i])
- {
- ++rep1;
- ++reps;
- }
-
- if (reps > options->repeat_count_threshold)
- {
- if (in_quotes)
- {
- fputs_filtered ("\", ", stream);
- in_quotes = 0;
- }
- m2_printchar (string[i], elttype, stream);
- fprintf_filtered (stream, " <repeats %u times>", reps);
- i = rep1 - 1;
- things_printed += options->repeat_count_threshold;
- need_comma = 1;
- }
- else
- {
- if (!in_quotes)
- {
- fputs_filtered ("\"", stream);
- in_quotes = 1;
- }
- LA_EMIT_CHAR (string[i], elttype, stream, '"');
- ++things_printed;
- }
- }
+ lai->set_string_char_type (builtin->builtin_char);
+ lai->set_bool_type (builtin->builtin_bool, "BOOLEAN");
+}
- /* Terminate the quotes if necessary. */
- if (in_quotes)
- fputs_filtered ("\"", stream);
+/* See languge.h. */
- if (force_ellipses || i < length)
- fputs_filtered ("...", stream);
- }
+void
+m2_language::printchar (int c, struct type *type,
+ struct ui_file *stream) const
+{
+ fputs_filtered ("'", stream);
+ emitchar (c, type, stream, '\'');
+ fputs_filtered ("'", stream);
+}
- /* See language.h. */
+/* See language.h. */
- void print_typedef (struct type *type, struct symbol *new_symbol,
- struct ui_file *stream) const override
- {
- m2_print_typedef (type, new_symbol, stream);
- }
+void
+m2_language::printstr (struct ui_file *stream, struct type *elttype,
+ const gdb_byte *string, unsigned int length,
+ const char *encoding, int force_ellipses,
+ const struct value_print_options *options) const
+{
+ unsigned int i;
+ unsigned int things_printed = 0;
+ int in_quotes = 0;
+ int need_comma = 0;
- /* See language.h. */
+ if (length == 0)
+ {
+ fputs_filtered ("\"\"", gdb_stdout);
+ return;
+ }
- bool is_string_type_p (struct type *type) const override
- {
- type = check_typedef (type);
- if (type->code () == TYPE_CODE_ARRAY
- && TYPE_LENGTH (type) > 0
- && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
- {
- struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
+ for (i = 0; i < length && things_printed < options->print_max; ++i)
+ {
+ /* Position of the character we are examining
+ to see whether it is repeated. */
+ unsigned int rep1;
+ /* Number of repetitions we have detected so far. */
+ unsigned int reps;
- if (TYPE_LENGTH (elttype) == 1
- && (elttype->code () == TYPE_CODE_INT
- || elttype->code () == TYPE_CODE_CHAR))
- return true;
- }
+ QUIT;
- return false;
- }
+ if (need_comma)
+ {
+ fputs_filtered (", ", stream);
+ need_comma = 0;
+ }
- /* See language.h. */
+ rep1 = i + 1;
+ reps = 1;
+ while (rep1 < length && string[rep1] == string[i])
+ {
+ ++rep1;
+ ++reps;
+ }
- bool c_style_arrays_p () const override
- { return false; }
+ if (reps > options->repeat_count_threshold)
+ {
+ if (in_quotes)
+ {
+ fputs_filtered ("\", ", stream);
+ in_quotes = 0;
+ }
+ printchar (string[i], elttype, stream);
+ fprintf_filtered (stream, " <repeats %u times>", reps);
+ i = rep1 - 1;
+ things_printed += options->repeat_count_threshold;
+ need_comma = 1;
+ }
+ else
+ {
+ if (!in_quotes)
+ {
+ fputs_filtered ("\"", stream);
+ in_quotes = 1;
+ }
+ emitchar (string[i], elttype, stream, '"');
+ ++things_printed;
+ }
+ }
- /* See language.h. Despite not having C-style arrays, Modula-2 uses 0
- for its string lower bounds. */
+ /* Terminate the quotes if necessary. */
+ if (in_quotes)
+ fputs_filtered ("\"", stream);
- char string_lower_bound () const override
- { return 0; }
+ if (force_ellipses || i < length)
+ fputs_filtered ("...", stream);
+}
- /* See language.h. */
+/* See language.h. */
- bool range_checking_on_by_default () const override
- { return true; }
-};
+void
+m2_language::emitchar (int ch, struct type *chtype,
+ struct ui_file *stream, int quoter) const
+{
+ ch &= 0xFF; /* Avoid sign bit follies. */
-/* Single instance of the M2 language. */
+ if (PRINT_LITERAL_FORM (ch))
+ {
+ if (ch == '\\' || ch == quoter)
+ fputs_filtered ("\\", stream);
+ fprintf_filtered (stream, "%c", ch);
+ }
+ else
+ {
+ switch (ch)
+ {
+ case '\n':
+ fputs_filtered ("\\n", stream);
+ break;
+ case '\b':
+ fputs_filtered ("\\b", stream);
+ break;
+ case '\t':
+ fputs_filtered ("\\t", stream);
+ break;
+ case '\f':
+ fputs_filtered ("\\f", stream);
+ break;
+ case '\r':
+ fputs_filtered ("\\r", stream);
+ break;
+ case '\033':
+ fputs_filtered ("\\e", stream);
+ break;
+ case '\007':
+ fputs_filtered ("\\a", stream);
+ break;
+ default:
+ fprintf_filtered (stream, "\\%.3o", (unsigned int) ch);
+ break;
+ }
+ }
+}
-static m2_language m2_language_defn;
+/* Called during architecture gdbarch initialisation to create language
+ specific types. */
static void *
build_m2_types (struct gdbarch *gdbarch)
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