[deliverable/binutils-gdb.git] / gdb / compile / compile-c-support.c

/* C language support for compilation.

   Copyright (C) 2014-2018 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 "compile-internal.h"
#include "compile-c.h"
#include "compile.h"
#include "gdb-dlfcn.h"
#include "c-lang.h"
#include "macrotab.h"
#include "macroscope.h"
#include "regcache.h"
#include "common/function-view.h"
#include "common/preprocessor.h"

/* See compile-internal.h.  */

const char *
c_get_mode_for_size (int size)
{
  const char *mode = NULL;

  switch (size)
    {
    case 1:
      mode = "QI";
      break;
    case 2:
      mode = "HI";
      break;
    case 4:
      mode = "SI";
      break;
    case 8:
      mode = "DI";
      break;
    default:
      internal_error (__FILE__, __LINE__, _("Invalid GCC mode size %d."), size);
    }

  return mode;
}

/* See compile-internal.h.  */

std::string
c_get_range_decl_name (const struct dynamic_prop *prop)
{
  return string_printf ("__gdb_prop_%s", host_address_to_string (prop));
}

\f

/* Helper function for c_get_compile_context.  Open the GCC front-end
   shared library and return the symbol specified by the current
   GCC_C_FE_CONTEXT.  */

static gcc_c_fe_context_function *
load_libcc (void)
{
  gcc_c_fe_context_function *func;

   /* gdb_dlopen will call error () on an error, so no need to check
      value.  */
  gdb_dlhandle_up handle = gdb_dlopen (STRINGIFY (GCC_C_FE_LIBCC));
  func = (gcc_c_fe_context_function *) gdb_dlsym (handle,
						  STRINGIFY (GCC_C_FE_CONTEXT));

  if (func == NULL)
    error (_("could not find symbol %s in library %s"),
	   STRINGIFY (GCC_C_FE_CONTEXT),
	   STRINGIFY (GCC_C_FE_LIBCC));

  /* Leave the library open.  */
  handle.release ();
  return func;
}

/* Return the compile instance associated with the current context.
   This function calls the symbol returned from the load_libcc
   function.  This will provide the gcc_c_context.  */

struct compile_instance *
c_get_compile_context (void)
{
  static gcc_c_fe_context_function *func;

  struct gcc_c_context *context;

  if (func == NULL)
    {
      func = load_libcc ();
      gdb_assert (func != NULL);
    }

  context = (*func) (GCC_FE_VERSION_0, GCC_C_FE_VERSION_0);
  if (context == NULL)
    error (_("The loaded version of GCC does not support the required version "
	     "of the API."));

  return new_compile_instance (context);
}

\f

/* Write one macro definition.  */

static void
print_one_macro (const char *name, const struct macro_definition *macro,
		 struct macro_source_file *source, int line,
		 ui_file *file)
{
  /* Don't print command-line defines.  They will be supplied another
     way.  */
  if (line == 0)
    return;

  /* None of -Wno-builtin-macro-redefined, #undef first
     or plain #define of the same value would avoid a warning.  */
  fprintf_filtered (file, "#ifndef %s\n# define %s", name, name);

  if (macro->kind == macro_function_like)
    {
      int i;

      fputs_filtered ("(", file);
      for (i = 0; i < macro->argc; i++)
	{
	  fputs_filtered (macro->argv[i], file);
	  if (i + 1 < macro->argc)
	    fputs_filtered (", ", file);
	}
      fputs_filtered (")", file);
    }

  fprintf_filtered (file, " %s\n#endif\n", macro->replacement);
}

/* Write macro definitions at PC to FILE.  */

static void
write_macro_definitions (const struct block *block, CORE_ADDR pc,
			 struct ui_file *file)
{
  gdb::unique_xmalloc_ptr<struct macro_scope> scope;

  if (block != NULL)
    scope = sal_macro_scope (find_pc_line (pc, 0));
  else
    scope = default_macro_scope ();
  if (scope == NULL)
    scope = user_macro_scope ();

  if (scope != NULL && scope->file != NULL && scope->file->table != NULL)
    {
      macro_for_each_in_scope (scope->file, scope->line,
			       [&] (const char *name,
				    const macro_definition *macro,
				    macro_source_file *source,
				    int line)
	{
	  print_one_macro (name, macro, source, line, file);
	});
    }
}

/* Helper function to construct a header scope for a block of code.
   Takes a scope argument which selects the correct header to
   insert into BUF.  */

static void
add_code_header (enum compile_i_scope_types type, struct ui_file *buf)
{
  switch (type)
    {
    case COMPILE_I_SIMPLE_SCOPE:
      fputs_unfiltered ("void "
			GCC_FE_WRAPPER_FUNCTION
			" (struct "
			COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG
			" *"
			COMPILE_I_SIMPLE_REGISTER_ARG_NAME
			") {\n",
			buf);
      break;
    case COMPILE_I_PRINT_ADDRESS_SCOPE:
    case COMPILE_I_PRINT_VALUE_SCOPE:
      /* <string.h> is needed for a memcpy call below.  */
      fputs_unfiltered ("#include <string.h>\n"
			"void "
			GCC_FE_WRAPPER_FUNCTION
			" (struct "
			COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG
			" *"
			COMPILE_I_SIMPLE_REGISTER_ARG_NAME
			", "
			COMPILE_I_PRINT_OUT_ARG_TYPE
			" "
			COMPILE_I_PRINT_OUT_ARG
			") {\n",
			buf);
      break;

    case COMPILE_I_RAW_SCOPE:
      break;
    default:
      gdb_assert_not_reached (_("Unknown compiler scope reached."));
    }
}

/* Helper function to construct a footer scope for a block of code.
   Takes a scope argument which selects the correct footer to
   insert into BUF.  */

static void
add_code_footer (enum compile_i_scope_types type, struct ui_file *buf)
{
  switch (type)
    {
    case COMPILE_I_SIMPLE_SCOPE:
    case COMPILE_I_PRINT_ADDRESS_SCOPE:
    case COMPILE_I_PRINT_VALUE_SCOPE:
      fputs_unfiltered ("}\n", buf);
      break;
    case COMPILE_I_RAW_SCOPE:
      break;
    default:
      gdb_assert_not_reached (_("Unknown compiler scope reached."));
    }
}

/* Generate a structure holding all the registers used by the function
   we're generating.  */

static void
generate_register_struct (struct ui_file *stream, struct gdbarch *gdbarch,
			  const unsigned char *registers_used)
{
  int i;
  int seen = 0;

  fputs_unfiltered ("struct " COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG " {\n",
		    stream);

  if (registers_used != NULL)
    for (i = 0; i < gdbarch_num_regs (gdbarch); ++i)
      {
	if (registers_used[i])
	  {
	    struct type *regtype = check_typedef (register_type (gdbarch, i));
	    std::string regname = compile_register_name_mangled (gdbarch, i);

	    seen = 1;

	    /* You might think we could use type_print here.  However,
	       target descriptions often use types with names like
	       "int64_t", which may not be defined in the inferior
	       (and in any case would not be looked up due to the
	       #pragma business).  So, we take a much simpler
	       approach: for pointer- or integer-typed registers, emit
	       the field in the most direct way; and for other
	       register types (typically flags or vectors), emit a
	       maximally-aligned array of the correct size.  */

	    fputs_unfiltered ("  ", stream);
	    switch (TYPE_CODE (regtype))
	      {
	      case TYPE_CODE_PTR:
		fprintf_filtered (stream, "__gdb_uintptr %s",
				  regname.c_str ());
		break;

	      case TYPE_CODE_INT:
		{
		  const char *mode
		    = c_get_mode_for_size (TYPE_LENGTH (regtype));

		  if (mode != NULL)
		    {
		      if (TYPE_UNSIGNED (regtype))
			fputs_unfiltered ("unsigned ", stream);
		      fprintf_unfiltered (stream,
					  "int %s"
					  " __attribute__ ((__mode__(__%s__)))",
					  regname.c_str (),
					  mode);
		      break;
		    }
		}

		/* Fall through.  */

	      default:
		fprintf_unfiltered (stream,
				    "  unsigned char %s[%d]"
				    " __attribute__((__aligned__("
				    "__BIGGEST_ALIGNMENT__)))",
				    regname.c_str (),
				    TYPE_LENGTH (regtype));
	      }
	    fputs_unfiltered (";\n", stream);
	  }
      }

  if (!seen)
    fputs_unfiltered ("  char " COMPILE_I_SIMPLE_REGISTER_DUMMY ";\n",
		      stream);

  fputs_unfiltered ("};\n\n", stream);
}

/* Take the source code provided by the user with the 'compile'
   command, and compute the additional wrapping, macro, variable and
   register operations needed.  INPUT is the source code derived from
   the 'compile' command, GDBARCH is the architecture to use when
   computing above, EXPR_BLOCK denotes the block relevant contextually
   to the inferior when the expression was created, and EXPR_PC
   indicates the value of $PC.  */

std::string
c_compute_program (struct compile_instance *inst,
		   const char *input,
		   struct gdbarch *gdbarch,
		   const struct block *expr_block,
		   CORE_ADDR expr_pc)
{
  struct compile_c_instance *context = (struct compile_c_instance *) inst;

  string_file buf;
  string_file var_stream;

  write_macro_definitions (expr_block, expr_pc, &buf);

  /* Do not generate local variable information for "raw"
     compilations.  In this case we aren't emitting our own function
     and the user's code may only refer to globals.  */
  if (inst->scope != COMPILE_I_RAW_SCOPE)
    {
      int i;

      /* Generate the code to compute variable locations, but do it
	 before generating the function header, so we can define the
	 register struct before the function body.  This requires a
	 temporary stream.  */
      gdb::unique_xmalloc_ptr<unsigned char> registers_used
	= generate_c_for_variable_locations (context, var_stream, gdbarch,
					     expr_block, expr_pc);

      buf.puts ("typedef unsigned int"
		" __attribute__ ((__mode__(__pointer__)))"
		" __gdb_uintptr;\n");
      buf.puts ("typedef int"
		" __attribute__ ((__mode__(__pointer__)))"
		" __gdb_intptr;\n");

      /* Iterate all log2 sizes in bytes supported by c_get_mode_for_size.  */
      for (i = 0; i < 4; ++i)
	{
	  const char *mode = c_get_mode_for_size (1 << i);

	  gdb_assert (mode != NULL);
	  buf.printf ("typedef int"
		      " __attribute__ ((__mode__(__%s__)))"
		      " __gdb_int_%s;\n",
		      mode, mode);
	}

      generate_register_struct (&buf, gdbarch, registers_used.get ());
    }

  add_code_header (inst->scope, &buf);

  if (inst->scope == COMPILE_I_SIMPLE_SCOPE
      || inst->scope == COMPILE_I_PRINT_ADDRESS_SCOPE
      || inst->scope == COMPILE_I_PRINT_VALUE_SCOPE)
    {
      buf.write (var_stream.c_str (), var_stream.size ());
      buf.puts ("#pragma GCC user_expression\n");
    }

  /* The user expression has to be in its own scope, so that "extern"
     works properly.  Otherwise gcc thinks that the "extern"
     declaration is in the same scope as the declaration provided by
     gdb.  */
  if (inst->scope != COMPILE_I_RAW_SCOPE)
    buf.puts ("{\n");

  buf.puts ("#line 1 \"gdb command line\"\n");

  switch (inst->scope)
    {
    case COMPILE_I_PRINT_ADDRESS_SCOPE:
    case COMPILE_I_PRINT_VALUE_SCOPE:
      buf.printf (
"__auto_type " COMPILE_I_EXPR_VAL " = %s;\n"
"typeof (%s) *" COMPILE_I_EXPR_PTR_TYPE ";\n"
"memcpy (" COMPILE_I_PRINT_OUT_ARG ", %s" COMPILE_I_EXPR_VAL ",\n"
	 "sizeof (*" COMPILE_I_EXPR_PTR_TYPE "));\n"
			  , input, input,
			  (inst->scope == COMPILE_I_PRINT_ADDRESS_SCOPE
			   ? "&" : ""));
      break;
    default:
      buf.puts (input);
      break;
    }

  buf.puts ("\n");

  /* For larger user expressions the automatic semicolons may be
     confusing.  */
  if (strchr (input, '\n') == NULL)
    buf.puts (";\n");

  if (inst->scope != COMPILE_I_RAW_SCOPE)
    buf.puts ("}\n");

  add_code_footer (inst->scope, &buf);
  return std::move (buf.string ());
}
Commit	Line	Data
bb2ec1b3 TT	1	/* C language support for compilation.
bb2ec1b3 TT	2
e2882c85	3	Copyright (C) 2014-2018 Free Software Foundation, Inc.
bb2ec1b3 TT	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
	20	#include "defs.h"
	21	#include "compile-internal.h"
b7dc48b4	22	#include "compile-c.h"
bb2ec1b3 TT	23	#include "compile.h"
	24	#include "gdb-dlfcn.h"
	25	#include "c-lang.h"
	26	#include "macrotab.h"
	27	#include "macroscope.h"
	28	#include "regcache.h"
14bc53a8	29	#include "common/function-view.h"
d269dfc6	30	#include "common/preprocessor.h"
bb2ec1b3 TT	31
	32	/* See compile-internal.h. */
	33
	34	const char *
	35	c_get_mode_for_size (int size)
	36	{
	37	const char *mode = NULL;
	38
	39	switch (size)
	40	{
	41	case 1:
	42	mode = "QI";
	43	break;
	44	case 2:
	45	mode = "HI";
	46	break;
	47	case 4:
	48	mode = "SI";
	49	break;
	50	case 8:
	51	mode = "DI";
	52	break;
	53	default:
	54	internal_error (__FILE__, __LINE__, _("Invalid GCC mode size %d."), size);
	55	}
	56
	57	return mode;
	58	}
	59
	60	/* See compile-internal.h. */
	61
8f84fb0e	62	std::string
bb2ec1b3 TT	63	c_get_range_decl_name (const struct dynamic_prop *prop)
bb2ec1b3 TT	64	{
8f84fb0e	65	return string_printf ("__gdb_prop_%s", host_address_to_string (prop));
bb2ec1b3 TT	66	}
	67
	68	\f
	69
bb2ec1b3 TT	70	/* Helper function for c_get_compile_context. Open the GCC front-end
	71	shared library and return the symbol specified by the current
	72	GCC_C_FE_CONTEXT. */
	73
	74	static gcc_c_fe_context_function *
	75	load_libcc (void)
	76	{
bb2ec1b3 TT	77	gcc_c_fe_context_function *func;
	78
	79	/* gdb_dlopen will call error () on an error, so no need to check
	80	value. */
0e8621a0	81	gdb_dlhandle_up handle = gdb_dlopen (STRINGIFY (GCC_C_FE_LIBCC));
bb2ec1b3 TT	82	func = (gcc_c_fe_context_function *) gdb_dlsym (handle,
	83	STRINGIFY (GCC_C_FE_CONTEXT));
	84
	85	if (func == NULL)
	86	error (_("could not find symbol %s in library %s"),
	87	STRINGIFY (GCC_C_FE_CONTEXT),
	88	STRINGIFY (GCC_C_FE_LIBCC));
0e8621a0 TT	89
	90	/* Leave the library open. */
	91	handle.release ();
bb2ec1b3 TT	92	return func;
	93	}
	94
	95	/* Return the compile instance associated with the current context.
	96	This function calls the symbol returned from the load_libcc
	97	function. This will provide the gcc_c_context. */
	98
	99	struct compile_instance *
	100	c_get_compile_context (void)
	101	{
	102	static gcc_c_fe_context_function *func;
	103
	104	struct gcc_c_context *context;
	105
	106	if (func == NULL)
	107	{
	108	func = load_libcc ();
	109	gdb_assert (func != NULL);
	110	}
	111
	112	context = (*func) (GCC_FE_VERSION_0, GCC_C_FE_VERSION_0);
	113	if (context == NULL)
	114	error (_("The loaded version of GCC does not support the required version "
	115	"of the API."));
	116
	117	return new_compile_instance (context);
	118	}
	119
	120	\f
	121
	122	/* Write one macro definition. */
	123
	124	static void
	125	print_one_macro (const char name, const struct macro_definition macro,
	126	struct macro_source_file *source, int line,
14bc53a8	127	ui_file *file)
bb2ec1b3	128	{
bb2ec1b3 TT	129	/* Don't print command-line defines. They will be supplied another
	130	way. */
	131	if (line == 0)
	132	return;
	133
3a9558c4 JK	134	/* None of -Wno-builtin-macro-redefined, #undef first
	135	or plain #define of the same value would avoid a warning. */
	136	fprintf_filtered (file, "#ifndef %s\n# define %s", name, name);
bb2ec1b3 TT	137
	138	if (macro->kind == macro_function_like)
	139	{
	140	int i;
	141
	142	fputs_filtered ("(", file);
	143	for (i = 0; i < macro->argc; i++)
	144	{
	145	fputs_filtered (macro->argv[i], file);
	146	if (i + 1 < macro->argc)
	147	fputs_filtered (", ", file);
	148	}
	149	fputs_filtered (")", file);
	150	}
	151
3a9558c4	152	fprintf_filtered (file, " %s\n#endif\n", macro->replacement);
bb2ec1b3 TT	153	}
	154
	155	/* Write macro definitions at PC to FILE. */
	156
	157	static void
	158	write_macro_definitions (const struct block *block, CORE_ADDR pc,
	159	struct ui_file *file)
	160	{
f6c2623e	161	gdb::unique_xmalloc_ptr<struct macro_scope> scope;
bb2ec1b3 TT	162
	163	if (block != NULL)
	164	scope = sal_macro_scope (find_pc_line (pc, 0));
	165	else
	166	scope = default_macro_scope ();
	167	if (scope == NULL)
	168	scope = user_macro_scope ();
	169
	170	if (scope != NULL && scope->file != NULL && scope->file->table != NULL)
14bc53a8 PA	171	{
	172	macro_for_each_in_scope (scope->file, scope->line,
	173	[&] (const char *name,
	174	const macro_definition *macro,
	175	macro_source_file *source,
	176	int line)
	177	{
	178	print_one_macro (name, macro, source, line, file);
	179	});
	180	}
bb2ec1b3 TT	181	}
	182
	183	/* Helper function to construct a header scope for a block of code.
	184	Takes a scope argument which selects the correct header to
	185	insert into BUF. */
	186
	187	static void
	188	add_code_header (enum compile_i_scope_types type, struct ui_file *buf)
	189	{
	190	switch (type)
	191	{
	192	case COMPILE_I_SIMPLE_SCOPE:
	193	fputs_unfiltered ("void "
	194	GCC_FE_WRAPPER_FUNCTION
	195	" (struct "
	196	COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG
	197	" *"
	198	COMPILE_I_SIMPLE_REGISTER_ARG_NAME
	199	") {\n",
	200	buf);
	201	break;
36de76f9 JK	202	case COMPILE_I_PRINT_ADDRESS_SCOPE:
	203	case COMPILE_I_PRINT_VALUE_SCOPE:
	204	/* <string.h> is needed for a memcpy call below. */
	205	fputs_unfiltered ("#include <string.h>\n"
	206	"void "
	207	GCC_FE_WRAPPER_FUNCTION
	208	" (struct "
	209	COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG
	210	" *"
	211	COMPILE_I_SIMPLE_REGISTER_ARG_NAME
	212	", "
	213	COMPILE_I_PRINT_OUT_ARG_TYPE
	214	" "
	215	COMPILE_I_PRINT_OUT_ARG
	216	") {\n",
	217	buf);
	218	break;
	219
bb2ec1b3 TT	220	case COMPILE_I_RAW_SCOPE:
	221	break;
	222	default:
	223	gdb_assert_not_reached (_("Unknown compiler scope reached."));
	224	}
	225	}
	226
	227	/* Helper function to construct a footer scope for a block of code.
	228	Takes a scope argument which selects the correct footer to
	229	insert into BUF. */
	230
	231	static void
	232	add_code_footer (enum compile_i_scope_types type, struct ui_file *buf)
	233	{
	234	switch (type)
	235	{
	236	case COMPILE_I_SIMPLE_SCOPE:
36de76f9 JK	237	case COMPILE_I_PRINT_ADDRESS_SCOPE:
36de76f9 JK	238	case COMPILE_I_PRINT_VALUE_SCOPE:
bb2ec1b3 TT	239	fputs_unfiltered ("}\n", buf);
	240	break;
	241	case COMPILE_I_RAW_SCOPE:
	242	break;
	243	default:
	244	gdb_assert_not_reached (_("Unknown compiler scope reached."));
	245	}
	246	}
	247
	248	/* Generate a structure holding all the registers used by the function
	249	we're generating. */
	250
	251	static void
	252	generate_register_struct (struct ui_file stream, struct gdbarch gdbarch,
	253	const unsigned char *registers_used)
	254	{
	255	int i;
	256	int seen = 0;
	257
	258	fputs_unfiltered ("struct " COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG " {\n",
	259	stream);
	260
	261	if (registers_used != NULL)
	262	for (i = 0; i < gdbarch_num_regs (gdbarch); ++i)
	263	{
	264	if (registers_used[i])
	265	{
	266	struct type *regtype = check_typedef (register_type (gdbarch, i));
8f84fb0e	267	std::string regname = compile_register_name_mangled (gdbarch, i);
bb2ec1b3 TT	268
	269	seen = 1;
	270
	271	/* You might think we could use type_print here. However,
	272	target descriptions often use types with names like
	273	"int64_t", which may not be defined in the inferior
	274	(and in any case would not be looked up due to the
	275	#pragma business). So, we take a much simpler
	276	approach: for pointer- or integer-typed registers, emit
	277	the field in the most direct way; and for other
	278	register types (typically flags or vectors), emit a
	279	maximally-aligned array of the correct size. */
	280
	281	fputs_unfiltered (" ", stream);
	282	switch (TYPE_CODE (regtype))
	283	{
	284	case TYPE_CODE_PTR:
8f84fb0e TT	285	fprintf_filtered (stream, "__gdb_uintptr %s",
8f84fb0e TT	286	regname.c_str ());
bb2ec1b3 TT	287	break;
	288
	289	case TYPE_CODE_INT:
	290	{
	291	const char *mode
	292	= c_get_mode_for_size (TYPE_LENGTH (regtype));
	293
	294	if (mode != NULL)
	295	{
	296	if (TYPE_UNSIGNED (regtype))
	297	fputs_unfiltered ("unsigned ", stream);
	298	fprintf_unfiltered (stream,
	299	"int %s"
	300	" __attribute__ ((__mode__(__%s__)))",
8f84fb0e	301	regname.c_str (),
bb2ec1b3 TT	302	mode);
	303	break;
	304	}
	305	}
	306
	307	/* Fall through. */
	308
	309	default:
	310	fprintf_unfiltered (stream,
	311	" unsigned char %s[%d]"
	312	" __attribute__((__aligned__("
	313	"__BIGGEST_ALIGNMENT__)))",
8f84fb0e	314	regname.c_str (),
bb2ec1b3 TT	315	TYPE_LENGTH (regtype));
	316	}
	317	fputs_unfiltered (";\n", stream);
bb2ec1b3 TT	318	}
	319	}
	320
	321	if (!seen)
	322	fputs_unfiltered (" char " COMPILE_I_SIMPLE_REGISTER_DUMMY ";\n",
	323	stream);
	324
	325	fputs_unfiltered ("};\n\n", stream);
	326	}
	327
	328	/* Take the source code provided by the user with the 'compile'
	329	command, and compute the additional wrapping, macro, variable and
	330	register operations needed. INPUT is the source code derived from
	331	the 'compile' command, GDBARCH is the architecture to use when
	332	computing above, EXPR_BLOCK denotes the block relevant contextually
	333	to the inferior when the expression was created, and EXPR_PC
	334	indicates the value of $PC. */
	335
aaee65ae	336	std::string
bb2ec1b3 TT	337	c_compute_program (struct compile_instance *inst,
	338	const char *input,
	339	struct gdbarch *gdbarch,
	340	const struct block *expr_block,
	341	CORE_ADDR expr_pc)
	342	{
bb2ec1b3 TT	343	struct compile_c_instance context = (struct compile_c_instance ) inst;
bb2ec1b3 TT	344
d7e74731 PA	345	string_file buf;
d7e74731 PA	346	string_file var_stream;
bb2ec1b3	347
d7e74731	348	write_macro_definitions (expr_block, expr_pc, &buf);
bb2ec1b3 TT	349
	350	/* Do not generate local variable information for "raw"
	351	compilations. In this case we aren't emitting our own function
	352	and the user's code may only refer to globals. */
	353	if (inst->scope != COMPILE_I_RAW_SCOPE)
	354	{
bb2ec1b3 TT	355	int i;
	356
	357	/* Generate the code to compute variable locations, but do it
	358	before generating the function header, so we can define the
	359	register struct before the function body. This requires a
	360	temporary stream. */
bd923e51 KS	361	gdb::unique_xmalloc_ptr<unsigned char> registers_used
	362	= generate_c_for_variable_locations (context, var_stream, gdbarch,
	363	expr_block, expr_pc);
bb2ec1b3	364
d7e74731 PA	365	buf.puts ("typedef unsigned int"
	366	" __attribute__ ((__mode__(__pointer__)))"
	367	" __gdb_uintptr;\n");
	368	buf.puts ("typedef int"
	369	" __attribute__ ((__mode__(__pointer__)))"
	370	" __gdb_intptr;\n");
bb2ec1b3	371
bb2b33b9	372	/* Iterate all log2 sizes in bytes supported by c_get_mode_for_size. */
bb2ec1b3 TT	373	for (i = 0; i < 4; ++i)
	374	{
	375	const char *mode = c_get_mode_for_size (1 << i);
	376
	377	gdb_assert (mode != NULL);
d7e74731 PA	378	buf.printf ("typedef int"
	379	" __attribute__ ((__mode__(__%s__)))"
	380	" __gdb_int_%s;\n",
	381	mode, mode);
bb2ec1b3	382	}
3a9558c4	383
bd923e51	384	generate_register_struct (&buf, gdbarch, registers_used.get ());
bb2ec1b3 TT	385	}
bb2ec1b3 TT	386
d7e74731	387	add_code_header (inst->scope, &buf);
bb2ec1b3	388
36de76f9 JK	389	if (inst->scope == COMPILE_I_SIMPLE_SCOPE
	390	\|\| inst->scope == COMPILE_I_PRINT_ADDRESS_SCOPE
	391	\|\| inst->scope == COMPILE_I_PRINT_VALUE_SCOPE)
bb2ec1b3	392	{
d7e74731 PA	393	buf.write (var_stream.c_str (), var_stream.size ());
d7e74731 PA	394	buf.puts ("#pragma GCC user_expression\n");
bb2ec1b3 TT	395	}
	396
	397	/* The user expression has to be in its own scope, so that "extern"
	398	works properly. Otherwise gcc thinks that the "extern"
	399	declaration is in the same scope as the declaration provided by
	400	gdb. */
	401	if (inst->scope != COMPILE_I_RAW_SCOPE)
d7e74731	402	buf.puts ("{\n");
bb2ec1b3	403
d7e74731	404	buf.puts ("#line 1 \"gdb command line\"\n");
36de76f9 JK	405
	406	switch (inst->scope)
	407	{
	408	case COMPILE_I_PRINT_ADDRESS_SCOPE:
	409	case COMPILE_I_PRINT_VALUE_SCOPE:
d7e74731	410	buf.printf (
36de76f9 JK	411	"__auto_type " COMPILE_I_EXPR_VAL " = %s;\n"
	412	"typeof (%s) *" COMPILE_I_EXPR_PTR_TYPE ";\n"
	413	"memcpy (" COMPILE_I_PRINT_OUT_ARG ", %s" COMPILE_I_EXPR_VAL ",\n"
	414	"sizeof (*" COMPILE_I_EXPR_PTR_TYPE "));\n"
	415	, input, input,
	416	(inst->scope == COMPILE_I_PRINT_ADDRESS_SCOPE
	417	? "&" : ""));
	418	break;
	419	default:
d7e74731	420	buf.puts (input);
36de76f9 JK	421	break;
	422	}
	423
d7e74731	424	buf.puts ("\n");
bb2ec1b3 TT	425
	426	/* For larger user expressions the automatic semicolons may be
	427	confusing. */
	428	if (strchr (input, '\n') == NULL)
d7e74731	429	buf.puts (";\n");
bb2ec1b3 TT	430
bb2ec1b3 TT	431	if (inst->scope != COMPILE_I_RAW_SCOPE)
d7e74731	432	buf.puts ("}\n");
bb2ec1b3	433
d7e74731 PA	434	add_code_footer (inst->scope, &buf);
d7e74731 PA	435	return std::move (buf.string ());
bb2ec1b3	436	}