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binutils-gdb/gdb/c-lang.h
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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/* C language support definitions 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/>. */
#if !defined (C_LANG_H)
#define C_LANG_H 1
struct ui_file;
struct language_arch_info;
struct type_print_options;
struct parser_state;
#include "value.h"
#include "macroexp.h"
#include "parser-defs.h"
/* The various kinds of C string and character. Note that these
values are chosen so that they may be or'd together in certain
ways. */
enum c_string_type
{
/* An ordinary string: "value". */
C_STRING = 0,
/* A wide string: L"value". */
C_WIDE_STRING = 1,
/* A 16-bit Unicode string: u"value". */
C_STRING_16 = 2,
/* A 32-bit Unicode string: U"value". */
C_STRING_32 = 3,
/* An ordinary char: 'v'. This can also be or'd with one of the
above to form the corresponding CHAR value from a STRING
value. */
C_CHAR = 4,
/* A wide char: L'v'. */
C_WIDE_CHAR = 5,
/* A 16-bit Unicode char: u'v'. */
C_CHAR_16 = 6,
/* A 32-bit Unicode char: U'v'. */
C_CHAR_32 = 7
};
/* Defined in c-exp.y. */
extern int c_parse (struct parser_state *);
extern void c_error (char *);
extern int c_parse_escape (const char **, struct obstack *);
/* Defined in c-typeprint.c */
extern void c_print_type (struct type *, const char *,
struct ui_file *, int, int,
const struct type_print_options *);
extern void c_print_typedef (struct type *,
struct symbol *,
struct ui_file *);
extern void c_val_print (struct type *, const gdb_byte *,
int, CORE_ADDR,
struct ui_file *, int,
const struct value *,
const struct value_print_options *);
extern void c_value_print (struct value *, struct ui_file *,
const struct value_print_options *);
/* These are in c-lang.c: */
extern struct value *evaluate_subexp_c (struct type *expect_type,
struct expression *exp,
int *pos,
enum noside noside);
extern void c_printchar (int, struct type *, struct ui_file *);
extern void c_printstr (struct ui_file * stream,
struct type *elttype,
const gdb_byte *string,
unsigned int length,
const char *user_encoding,
int force_ellipses,
const struct value_print_options *options);
extern void c_language_arch_info (struct gdbarch *gdbarch,
struct language_arch_info *lai);
extern const struct exp_descriptor exp_descriptor_c;
extern void c_emit_char (int c, struct type *type,
struct ui_file *stream, int quoter);
extern const struct op_print c_op_print_tab[];
/* These are in c-typeprint.c: */
extern void c_type_print_base (struct type *, struct ui_file *,
int, int, const struct type_print_options *);
/* These are in cp-valprint.c */
extern void cp_print_class_member (const gdb_byte *, struct type *,
struct ui_file *, char *);
extern void cp_print_value_fields (struct type *, struct type *,
const gdb_byte *, int, CORE_ADDR,
struct ui_file *, int,
const struct value *,
const struct value_print_options *,
struct type **, int);
extern void cp_print_value_fields_rtti (struct type *,
const gdb_byte *, int, CORE_ADDR,
struct ui_file *, int,
const struct value *,
const struct value_print_options *,
struct type **, int);
extern int cp_is_vtbl_ptr_type (struct type *);
extern int cp_is_vtbl_member (struct type *);
/* These are in c-valprint.c. */
extern int c_textual_element_type (struct type *, char);
/* Create a new instance of the C compiler and return it. The new
compiler is owned by the caller and must be freed using the destroy
method. This function never returns NULL, but rather throws an
exception on failure. This is suitable for use as the
la_get_compile_instance language method. */
extern struct compile_instance *c_get_compile_context (void);
/* This takes the user-supplied text and returns a newly malloc'd bit
of code to compile.
This is used as the la_compute_program language method; see that
for a description of the arguments. */
extern char *c_compute_program (struct compile_instance *inst,
const char *input,
struct gdbarch *gdbarch,
const struct block *expr_block,
CORE_ADDR expr_pc);
#endif /* !defined (C_LANG_H) */
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