/* Modula 2 language support routines for GDB, the GNU debugger.
- Copyright (C) 1992-2015 Free Software Foundation, Inc.
+ Copyright (C) 1992-2021 Free Software Foundation, Inc.
This file is part of GDB.
#include "m2-lang.h"
#include "c-lang.h"
#include "valprint.h"
+#include "gdbarch.h"
+#include "m2-exp.h"
-extern void _initialize_m2_language (void);
-static void m2_printchar (int, struct type *, struct ui_file *);
-static void m2_emit_char (int, struct type *, struct ui_file *, int);
+/* A helper function for UNOP_HIGH. */
-/* Print the character C on STREAM as part of the contents of a literal
- string whose delimiter is QUOTER. Note that that format for printing
- characters and strings is language specific.
- 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_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
+struct value *
+eval_op_m2_high (struct type *expect_type, struct expression *exp,
+ enum noside noside,
+ struct value *arg1)
{
-
- c &= 0xFF; /* Avoid sign bit follies. */
-
- if (PRINT_LITERAL_FORM (c))
+ if (noside == EVAL_AVOID_SIDE_EFFECTS)
+ return arg1;
+ else
{
- if (c == '\\' || c == quoter)
+ arg1 = coerce_ref (arg1);
+ struct type *type = check_typedef (value_type (arg1));
+
+ if (m2_is_unbounded_array (type))
{
- fputs_filtered ("\\", stream);
+ struct value *temp = arg1;
+
+ 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_high field"));
+
+ if (value_type (arg1) != type)
+ arg1 = value_cast (type, arg1);
}
- fprintf_filtered (stream, "%c", c);
}
- else
+ return arg1;
+}
+
+/* A helper function for BINOP_SUBSCRIPT. */
+
+struct value *
+eval_op_m2_subscript (struct type *expect_type, struct expression *exp,
+ enum noside noside,
+ struct value *arg1, struct value *arg2)
+{
+ /* 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);
+ struct type *type = check_typedef (value_type (arg1));
+
+ if (m2_is_unbounded_array (type))
{
- switch (c)
- {
- 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) c);
- break;
- }
+ 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);
+
+ 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));
}
-/* FIXME: This is a copy of the same function from c-exp.y. It should
- be replaced with a true Modula version. */
+\f
+
+/* Single instance of the M2 language. */
+
+static m2_language m2_language_defn;
+
+/* 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);
-static void
-m2_printchar (int c, struct type *type, struct ui_file *stream)
+ /* Helper function to allow shorter lines below. */
+ auto add = [&] (struct type * t)
+ {
+ lai->add_primitive_type (t);
+ };
+
+ add (builtin->builtin_char);
+ add (builtin->builtin_int);
+ add (builtin->builtin_card);
+ add (builtin->builtin_real);
+ add (builtin->builtin_bool);
+
+ lai->set_string_char_type (builtin->builtin_char);
+ lai->set_bool_type (builtin->builtin_bool, "BOOLEAN");
+}
+
+/* See languge.h. */
+
+void
+m2_language::printchar (int c, struct type *type,
+ struct ui_file *stream) const
{
fputs_filtered ("'", stream);
- LA_EMIT_CHAR (c, type, stream, '\'');
+ emitchar (c, type, stream, '\'');
fputs_filtered ("'", stream);
}
-/* Print the character string STRING, printing at most LENGTH characters.
- Printing stops early if the number hits print_max; repeat counts
- are printed as appropriate. Print ellipses at the end if we
- had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
- 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_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string,
- unsigned int length, const char *encoding, int force_ellipses,
- const struct value_print_options *options)
+/* See language.h. */
+
+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;
for (i = 0; i < length && things_printed < options->print_max; ++i)
{
/* Position of the character we are examining
- to see whether it is repeated. */
+ to see whether it is repeated. */
unsigned int rep1;
/* Number of repetitions we have detected so far. */
unsigned int reps;
fputs_filtered ("\", ", stream);
in_quotes = 0;
}
- m2_printchar (string[i], type, stream);
+ printchar (string[i], elttype, stream);
fprintf_filtered (stream, " <repeats %u times>", reps);
i = rep1 - 1;
things_printed += options->repeat_count_threshold;
fputs_filtered ("\"", stream);
in_quotes = 1;
}
- LA_EMIT_CHAR (string[i], type, stream, '"');
+ emitchar (string[i], elttype, stream, '"');
++things_printed;
}
}
fputs_filtered ("...", stream);
}
-static struct value *
-evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
- int *pos, enum noside noside)
+/* See language.h. */
+
+void
+m2_language::emitchar (int ch, struct type *chtype,
+ struct ui_file *stream, int quoter) const
{
- enum exp_opcode op = exp->elts[*pos].opcode;
- struct value *arg1;
- struct value *arg2;
- struct type *type;
+ ch &= 0xFF; /* Avoid sign bit follies. */
- switch (op)
+ if (PRINT_LITERAL_FORM (ch))
{
- 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_TYPE (type, 1);
- /* 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));
-
- if (m2_is_unbounded_array (type))
+ if (ch == '\\' || ch == quoter)
+ fputs_filtered ("\\", stream);
+ fprintf_filtered (stream, "%c", ch);
+ }
+ else
+ {
+ switch (ch)
{
- struct value *temp = arg1;
- type = TYPE_FIELD_TYPE (type, 0);
- if (type == NULL || (TYPE_CODE (type) != 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,
- _("unbounded structure "
- "missing _m2_contents 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)));
+ 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;
}
- else
- if (TYPE_CODE (type) != TYPE_CODE_ARRAY)
- {
- if (TYPE_NAME (type))
- error (_("cannot subscript something of type `%s'"),
- TYPE_NAME (type));
- 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);
-}
-\f
-
-/* Table of operators and their precedences for printing expressions. */
-
-static const struct op_print m2_op_print_tab[] =
-{
- {"+", 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, 0, 0, 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
-};
-
-static void
-m2_language_arch_info (struct gdbarch *gdbarch,
- struct language_arch_info *lai)
-{
- 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;
}
-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
-};
-
-const struct language_defn m2_language_defn =
-{
- "modula-2",
- "Modula-2",
- language_m2,
- range_check_on,
- case_sensitive_on,
- array_row_major,
- macro_expansion_no,
- &exp_descriptor_modula2,
- m2_parse, /* parser */
- m2_error, /* parser error function */
- null_post_parser,
- m2_printchar, /* Print character constant */
- m2_printstr, /* function to print string constant */
- m2_emit_char, /* Function to print a single character */
- m2_print_type, /* Print a type using appropriate syntax */
- m2_print_typedef, /* Print a typedef using appropriate syntax */
- m2_val_print, /* Print a value using appropriate syntax */
- c_value_print, /* Print a top-level value */
- default_read_var_value, /* la_read_var_value */
- NULL, /* Language specific skip_trampoline */
- NULL, /* name_of_this */
- basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
- basic_lookup_transparent_type,/* lookup_transparent_type */
- NULL, /* Language specific symbol demangler */
- NULL, /* Language specific
- class_name_from_physname */
- m2_op_print_tab, /* expression operators for printing */
- 0, /* arrays are first-class (not c-style) */
- 0, /* String lower bound */
- default_word_break_characters,
- default_make_symbol_completion_list,
- m2_language_arch_info,
- default_print_array_index,
- default_pass_by_reference,
- default_get_string,
- NULL, /* la_get_symbol_name_cmp */
- iterate_over_symbols,
- &default_varobj_ops,
- NULL,
- NULL,
- LANG_MAGIC
-};
+/* Called during architecture gdbarch initialisation to create language
+ specific types. */
static void *
build_m2_types (struct gdbarch *gdbarch)
builtin_m2_type->builtin_card
= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL");
builtin_m2_type->builtin_real
- = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL", NULL);
+ = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL",
+ gdbarch_float_format (gdbarch));
builtin_m2_type->builtin_char
= arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR");
builtin_m2_type->builtin_bool
const struct builtin_m2_type *
builtin_m2_type (struct gdbarch *gdbarch)
{
- return gdbarch_data (gdbarch, m2_type_data);
+ return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data);
}
/* Initialization for Modula-2 */
+void _initialize_m2_language ();
void
-_initialize_m2_language (void)
+_initialize_m2_language ()
{
m2_type_data = gdbarch_data_register_post_init (build_m2_types);
-
- add_language (&m2_language_defn);
}
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