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old-cross-binutils/gdb/m2-lang.c
Tom Tromey bb2ec1b34e the "compile" command 
This final patch adds the new "compile" command and subcommands, and
all the machinery needed to make it work.

A shared library supplied by gcc is used for all communications with
gcc.  Types and most aspects of symbols are provided directly by gdb
to the compiler using this library.

gdb provides some information about the user's code using plain text.
Macros are emitted this way, and DWARF location expressions (and
bounds for VLA) are compiled to C code.

This hybrid approach was taken because, on the one hand, it is better
to provide global declarations and such on demand; but on the other
hand, for local variables, translating DWARF location expressions to C
was much simpler than exporting a full compiler API to gdb -- the same
result, only easier to implement, understand, and debug.

In the ordinary mode, the user's expression is wrapped in a dummy
function.  After compilation, gdb inserts the resulting object code
into the inferior, then calls this function.

Access to local variables is provided by noting which registers are
used by location expressions, and passing a structure of register
values into the function.  Writes to registers are supported by
copying out these values after the function returns.

This approach was taken so that we could eventually implement other
more interesting features based on this same infrastructure; for
example, we're planning to investigate inferior-side breakpoint
conditions.

gdb/ChangeLog
2014-12-12  Phil Muldoon  <pmuldoon@redhat.com>
	    Jan Kratochvil  <jan.kratochvil@redhat.com>
	    Tom Tromey  <tromey@redhat.com>

	* NEWS: Update.
	* symtab.h (struct symbol_computed_ops) <generate_c_location>: New
	field.
	* p-lang.c (pascal_language_defn): Update.
	* opencl-lang.c (opencl_language_defn): Update.
	* objc-lang.c (objc_language_defn): Update.
	* m2-lang.c (m2_language_defn): Update.
	* language.h (struct language_defn) <la_get_compile_instance,
	la_compute_program>: New fields.
	* language.c (unknown_language_defn, auto_language_defn)
	(local_language_defn): Update.
	* jv-lang.c (java_language_defn): Update.
	* go-lang.c (go_language_defn): Update.
	* f-lang.c (f_language_defn): Update.
	* dwarf2loc.h (dwarf2_compile_property_to_c): Declare.
	* dwarf2loc.c (dwarf2_compile_property_to_c)
	(locexpr_generate_c_location, loclist_generate_c_location): New
	functions.
	(dwarf2_locexpr_funcs, dwarf2_loclist_funcs): Update.
	* defs.h (enum compile_i_scope_types): New.
	(enum command_control_type) <compile_control>: New constant.
	(struct command_line) <control_u>: New field.
	* d-lang.c (d_language_defn): Update.
	* compile/compile.c: New file.
	* compile/compile-c-support.c: New file.
	* compile/compile-c-symbols.c: New file.
	* compile/compile-c-types.c: New file.
	* compile/compile.h: New file.
	* compile/compile-internal.h: New file.
	* compile/compile-loc2c.c: New file.
	* compile/compile-object-load.c: New file.
	* compile/compile-object-load.h: New file.
	* compile/compile-object-run.c: New file.
	* compile/compile-object-run.h: New file.
	* cli/cli-script.c (multi_line_command_p, print_command_lines)
	(execute_control_command, process_next_line)
	(recurse_read_control_structure): Handle compile_control.
	* c-lang.h (c_get_compile_context, c_compute_program): Declare.
	* c-lang.c (c_language_defn, cplus_language_defn)
	(asm_language_defn, minimal_language_defn): Update.
	* ada-lang.c (ada_language_defn): Update.
	* Makefile.in (SUBDIR_GCC_COMPILE_OBS, SUBDIR_GCC_COMPILE_SRCS):
	New variables.
	(SFILES): Add SUBDIR_GCC_COMPILE_SRCS.
	(HFILES_NO_SRCDIR): Add compile.h.
	(COMMON_OBS): Add SUBDIR_GCC_COMPILE_OBS.
	(INIT_FILES): Add SUBDIR_GCC_COMPILE_SRCS.
	(compile.o, compile-c-types.o, compile-c-symbols.o)
	(compile-object-load.o, compile-object-run.o, compile-loc2c.o)
	(compile-c-support.o): New targets.

gdb/doc/ChangeLog
2014-12-12  Phil Muldoon  <pmuldoon@redhat.com>
	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.texinfo (Altering): Update.
	(Compiling and Injecting Code): New node.

gdb/testsuite/ChangeLog
2014-12-12  Phil Muldoon  <pmuldoon@redhat.com>
	    Jan Kratochvil  <jan.kratochvil@redhat.com>
	    Tom Tromey  <tromey@redhat.com>

	* configure.ac: Add gdb.compile/.
	* configure: Regenerate.
	* gdb.compile/Makefile.in: New file.
	* gdb.compile/compile-ops.exp: New file.
	* gdb.compile/compile-ops.c: New file.
	* gdb.compile/compile-tls.c: New file.
	* gdb.compile/compile-tls.exp: New file.
	* gdb.compile/compile-constvar.S: New file.
	* gdb.compile/compile-constvar.c: New file.
	* gdb.compile/compile-mod.c: New file.
	* gdb.compile/compile-nodebug.c: New file.
	* gdb.compile/compile-setjmp-mod.c: New file.
	* gdb.compile/compile-setjmp.c: New file.
	* gdb.compile/compile-setjmp.exp: New file.
	* gdb.compile/compile-shlib.c: New file.
	* gdb.compile/compile.c: New file.
	* gdb.compile/compile.exp: New file.
	* lib/gdb.exp (skip_compile_feature_tests): New proc.
2014-12-12 22:28:44 +01:00

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/* Modula 2 language support routines for GDB, the GNU debugger.
Copyright (C) 1992-2014 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "varobj.h"
#include "m2-lang.h"
#include "c-lang.h"
#include "valprint.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);
/* 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)
{
c &= 0xFF; /* Avoid sign bit follies. */
if (PRINT_LITERAL_FORM (c))
{
if (c == '\\' || c == quoter)
{
fputs_filtered ("\\", stream);
}
fprintf_filtered (stream, "%c", c);
}
else
{
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;
}
}
}
/* 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)
{
fputs_filtered ("'", stream);
LA_EMIT_CHAR (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)
{
unsigned int i;
unsigned int things_printed = 0;
int in_quotes = 0;
int need_comma = 0;
if (length == 0)
{
fputs_filtered ("\"\"", gdb_stdout);
return;
}
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], type, 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], type, stream, '"');
++things_printed;
}
}
/* Terminate the quotes if necessary. */
if (in_quotes)
fputs_filtered ("\"", stream);
if (force_ellipses || i < length)
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)
{
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))
{
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)));
}
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);
}
/* 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}
};
/* 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
};
static void *
build_m2_types (struct gdbarch *gdbarch)
{
struct builtin_m2_type *builtin_m2_type
= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type);
/* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
builtin_m2_type->builtin_int
= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER");
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);
builtin_m2_type->builtin_char
= arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR");
builtin_m2_type->builtin_bool
= arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN");
return builtin_m2_type;
}
static struct gdbarch_data *m2_type_data;
const struct builtin_m2_type *
builtin_m2_type (struct gdbarch *gdbarch)
{
return gdbarch_data (gdbarch, m2_type_data);
}
/* Initialization for Modula-2 */
void
_initialize_m2_language (void)
{
m2_type_data = gdbarch_data_register_post_init (build_m2_types);
add_language (&m2_language_defn);
}
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