[deliverable/binutils-gdb.git] / gdb / compile / compile-cplus-symbols.c

/* Convert symbols from GDB to GCC

   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-cplus.h"
#include "gdb_assert.h"
#include "symtab.h"
#include "parser-defs.h"
#include "block.h"
#include "objfiles.h"
#include "compile.h"
#include "value.h"
#include "exceptions.h"
#include "gdbtypes.h"
#include "dwarf2loc.h"
#include "cp-support.h"
#include "gdbcmd.h"
#include "compile-c.h"

/* Convert a given symbol, SYM, to the compiler's representation.
   INSTANCE is the compiler instance.  IS_GLOBAL is true if the
   symbol came from the global scope.  IS_LOCAL is true if the symbol
   came from a local scope.  (Note that the two are not strictly
   inverses because the symbol might have come from the static
   scope.)  */

static void
convert_one_symbol (compile_cplus_instance *instance,
		    struct block_symbol sym, bool is_global, bool is_local)
{
  /* Squash compiler warning.  */
  gcc_type sym_type = 0;
  const char *filename = symbol_symtab (sym.symbol)->filename;
  unsigned short line = SYMBOL_LINE (sym.symbol);

  instance->error_symbol_once (sym.symbol);

  if (SYMBOL_CLASS (sym.symbol) == LOC_LABEL)
    sym_type = 0;
  else
    sym_type = instance->convert_type (SYMBOL_TYPE (sym.symbol));

  if (SYMBOL_DOMAIN (sym.symbol) == STRUCT_DOMAIN)
    {
      /* Nothing to do.  */
    }
  else
    {
      /* Squash compiler warning.  */
      gcc_cp_symbol_kind_flags kind = GCC_CP_FLAG_BASE;
      CORE_ADDR addr = 0;
      std::string name;
      gdb::unique_xmalloc_ptr<char> symbol_name;

      switch (SYMBOL_CLASS (sym.symbol))
	{
	case LOC_TYPEDEF:
	  if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_TYPEDEF)
	    kind = GCC_CP_SYMBOL_TYPEDEF;
	  else  if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_NAMESPACE)
	    return;
	  break;

	case LOC_LABEL:
	  kind = GCC_CP_SYMBOL_LABEL;
	  addr = SYMBOL_VALUE_ADDRESS (sym.symbol);
	  break;

	case LOC_BLOCK:
	  {
	    kind = GCC_CP_SYMBOL_FUNCTION;
	    addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym.symbol));
	    if (is_global && TYPE_GNU_IFUNC (SYMBOL_TYPE (sym.symbol)))
	      addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
	  }
	  break;

	case LOC_CONST:
	  if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_ENUM)
	    {
	      /* Already handled by convert_enum.  */
	      return;
	    }
	  instance->plugin ().build_constant
	    (sym_type, SYMBOL_NATURAL_NAME (sym.symbol),
	     SYMBOL_VALUE (sym.symbol), filename, line);
	  return;

	case LOC_CONST_BYTES:
	  error (_("Unsupported LOC_CONST_BYTES for symbol \"%s\"."),
		 SYMBOL_PRINT_NAME (sym.symbol));

	case LOC_UNDEF:
	  internal_error (__FILE__, __LINE__, _("LOC_UNDEF found for \"%s\"."),
			  SYMBOL_PRINT_NAME (sym.symbol));

	case LOC_COMMON_BLOCK:
	  error (_("Fortran common block is unsupported for compilation "
		   "evaluaton of symbol \"%s\"."),
		 SYMBOL_PRINT_NAME (sym.symbol));

	case LOC_OPTIMIZED_OUT:
	  error (_("Symbol \"%s\" cannot be used for compilation evaluation "
		   "as it is optimized out."),
		 SYMBOL_PRINT_NAME (sym.symbol));

	case LOC_COMPUTED:
	  if (is_local)
	    goto substitution;
	  /* Probably TLS here.  */
	  warning (_("Symbol \"%s\" is thread-local and currently can only "
		     "be referenced from the current thread in "
		     "compiled code."),
		   SYMBOL_PRINT_NAME (sym.symbol));
	  /* FALLTHROUGH */
	case LOC_UNRESOLVED:
	  /* 'symbol_name' cannot be used here as that one is used only for
	     local variables from compile_dwarf_expr_to_c.
	     Global variables can be accessed by GCC only by their address, not
	     by their name.  */
	  {
	    struct value *val;
	    struct frame_info *frame = nullptr;

	    if (symbol_read_needs_frame (sym.symbol))
	      {
		frame = get_selected_frame (nullptr);
		if (frame == nullptr)
		  error (_("Symbol \"%s\" cannot be used because "
			   "there is no selected frame"),
			 SYMBOL_PRINT_NAME (sym.symbol));
	      }

	    val = read_var_value (sym.symbol, sym.block, frame);
	    if (VALUE_LVAL (val) != lval_memory)
	      error (_("Symbol \"%s\" cannot be used for compilation "
		       "evaluation as its address has not been found."),
		     SYMBOL_PRINT_NAME (sym.symbol));

	    kind = GCC_CP_SYMBOL_VARIABLE;
	    addr = value_address (val);
	  }
	  break;


	case LOC_REGISTER:
	case LOC_ARG:
	case LOC_REF_ARG:
	case LOC_REGPARM_ADDR:
	case LOC_LOCAL:
	substitution:
	  kind = GCC_CP_SYMBOL_VARIABLE;
	  symbol_name = c_symbol_substitution_name (sym.symbol);
	  break;

	case LOC_STATIC:
	  kind = GCC_CP_SYMBOL_VARIABLE;
	  addr = SYMBOL_VALUE_ADDRESS (sym.symbol);
	  break;

	case LOC_FINAL_VALUE:
	default:
	  gdb_assert_not_reached ("Unreachable case in convert_one_symbol.");
	}

      /* Don't emit local variable decls for a raw expression.  */
      if (instance->scope () != COMPILE_I_RAW_SCOPE || symbol_name == nullptr)
	{
	  compile_scope scope;

	  /* For non-local symbols, create/push a new scope so that the
	     symbol is properly scoped to the plug-in.  */
	  if (!is_local)
	    {
	      scope
		= instance->new_scope (SYMBOL_NATURAL_NAME (sym.symbol),
				       SYMBOL_TYPE (sym.symbol));
	      if (scope.nested_type () != GCC_TYPE_NONE)
		{
		  /* We found a symbol for this type that was defined inside
		     some other symbol, e.g., a class tyepdef defined.  */
		  return;
		}

	      instance->enter_scope (scope);
	    }

	  /* Get the `raw' name of the symbol.  */
	  if (name.empty () && SYMBOL_NATURAL_NAME (sym.symbol) != nullptr)
	    name = compile_cplus_instance::decl_name
	      (SYMBOL_NATURAL_NAME (sym.symbol)).get ();

	  /* Define the decl.  */
	  instance->plugin ().build_decl
	    ("variable", name.c_str (), kind, sym_type,
	     symbol_name.get (), addr, filename, line);

	  /* Pop scope for non-local symbols.  */
	  if (!is_local)
	    instance->leave_scope ();
	}
    }
}

/* Convert a full symbol to its gcc form.  CONTEXT is the compiler to
   use, IDENTIFIER is the name of the symbol, SYM is the symbol
   itself, and DOMAIN is the domain which was searched.  */

static void
convert_symbol_sym (compile_cplus_instance *instance,
		    const char *identifier, struct block_symbol sym,
		    domain_enum domain)
{
  /* If we found a symbol and it is not in the  static or global
     scope, then we should first convert any static or global scope
     symbol of the same name.  This lets this unusual case work:

     int x; // Global.
     int func(void)
     {
     int x;
     // At this spot, evaluate "extern int x; x"
     }
  */

  const struct block *static_block = block_static_block (sym.block);
  /* STATIC_BLOCK is NULL if FOUND_BLOCK is the global block.  */
  bool is_local_symbol = (sym.block != static_block && static_block != nullptr);
  if (is_local_symbol)
    {
      struct block_symbol global_sym;

      global_sym = lookup_symbol (identifier, nullptr, domain, nullptr);
      /* If the outer symbol is in the static block, we ignore it, as
	 it cannot be referenced.  */
      if (global_sym.symbol != nullptr
	  && global_sym.block != block_static_block (global_sym.block))
	{
	  if (compile_debug)
	    fprintf_unfiltered (gdb_stdlog,
				"gcc_convert_symbol \"%s\": global symbol\n",
				identifier);
	  convert_one_symbol (instance, global_sym, true, false);
	}
    }

  if (compile_debug)
    fprintf_unfiltered (gdb_stdlog,
			"gcc_convert_symbol \"%s\": local symbol\n",
			identifier);
  convert_one_symbol (instance, sym, false, is_local_symbol);
}

/* Convert a minimal symbol to its gcc form.  CONTEXT is the compiler
   to use and BMSYM is the minimal symbol to convert.  */

static void
convert_symbol_bmsym (compile_cplus_instance *instance,
		      struct bound_minimal_symbol bmsym)
{
  struct minimal_symbol *msym = bmsym.minsym;
  struct objfile *objfile = bmsym.objfile;
  struct type *type;
  gcc_cp_symbol_kind_flags kind;
  gcc_type sym_type;
  CORE_ADDR addr;

  addr = MSYMBOL_VALUE_ADDRESS (objfile, msym);

  /* Conversion copied from write_exp_msymbol.  */
  switch (MSYMBOL_TYPE (msym))
    {
    case mst_text:
    case mst_file_text:
    case mst_solib_trampoline:
      type = objfile_type (objfile)->nodebug_text_symbol;
      kind = GCC_CP_SYMBOL_FUNCTION;
      break;

    case mst_text_gnu_ifunc:
      /* nodebug_text_gnu_ifunc_symbol would cause:
	 function return type cannot be function  */
      type = objfile_type (objfile)->nodebug_text_symbol;
      kind = GCC_CP_SYMBOL_FUNCTION;
      addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
      break;

    case mst_data:
    case mst_file_data:
    case mst_bss:
    case mst_file_bss:
      type = objfile_type (objfile)->nodebug_data_symbol;
      kind = GCC_CP_SYMBOL_VARIABLE;
      break;

    case mst_slot_got_plt:
      type = objfile_type (objfile)->nodebug_got_plt_symbol;
      kind = GCC_CP_SYMBOL_FUNCTION;
      break;

    default:
      type = objfile_type (objfile)->nodebug_unknown_symbol;
      kind = GCC_CP_SYMBOL_VARIABLE;
      break;
    }

  sym_type = instance->convert_type (type);
  instance->plugin ().push_namespace ("");
  instance->plugin ().build_decl
    ("minsym", MSYMBOL_NATURAL_NAME (msym), kind, sym_type, nullptr, addr,
     nullptr, 0);
  instance->plugin ().pop_binding_level ("");
}

/* See compile-cplus.h.  */

void
gcc_cplus_convert_symbol (void *datum,
			  struct gcc_cp_context *gcc_context,
			  enum gcc_cp_oracle_request request,
			  const char *identifier)
{
  if (compile_debug)
    fprintf_unfiltered (gdb_stdlog,
			"got oracle request for \"%s\"\n", identifier);

  bool found = false;
  compile_cplus_instance *instance = (compile_cplus_instance *) datum;

  TRY
    {
      /* Symbol searching is a three part process unfortunately.  */

      /* First do a "standard" lookup, converting any found symbols.
	 This will find variables in the current scope.  */

      struct block_symbol sym
	= lookup_symbol (identifier, instance->block (), VAR_DOMAIN, nullptr);

      if (sym.symbol != nullptr)
	{
	  found = true;
	  convert_symbol_sym (instance, identifier, sym, VAR_DOMAIN);
	}

      /* Then use linespec.c's multi-symbol search.  This should find
	 all non-variable symbols for which we have debug info.  */

      symbol_searcher searcher;
      searcher.find_all_symbols (identifier, current_language,
				 ALL_DOMAIN, nullptr, nullptr);

      /* Convert any found symbols.  */
      for (const auto &it : searcher.matching_symbols ())
	{
	  /* Don't convert the symbol found above, if any, twice!  */
	  if (it.symbol != sym.symbol)
	    {
	      found = true;
	      convert_symbol_sym (instance, identifier, it,
				  SYMBOL_DOMAIN (it.symbol));
	    }
	}

      /* Finally, if no symbols have been found, fall back to minsyms.  */
      if (!found)
	{
	  for (const auto &it : searcher.matching_msymbols ())
	    {
	      found = true;
	      convert_symbol_bmsym (instance, it);
	    }
	}
    }
  CATCH (e, RETURN_MASK_ALL)
    {
      /* We can't allow exceptions to escape out of this callback.  Safest
	 is to simply emit a gcc error.  */
      instance->plugin ().error (e.message);
    }
  END_CATCH

  if (compile_debug && !found)
    fprintf_unfiltered (gdb_stdlog,
			"gcc_convert_symbol \"%s\": lookup_symbol failed\n",
			identifier);

  if (compile_debug)
    {
      if (found)
	fprintf_unfiltered (gdb_stdlog, "found type for %s\n", identifier);
      else
	{
	  fprintf_unfiltered (gdb_stdlog, "did not find type for %s\n",
			      identifier);
	}
    }

  return;
}

/* See compile-cplus.h.  */

gcc_address
gcc_cplus_symbol_address (void *datum, struct gcc_cp_context *gcc_context,
			  const char *identifier)
{
  compile_cplus_instance *instance = (compile_cplus_instance *) datum;
  gcc_address result = 0;
  int found = 0;

  if (compile_debug)
    fprintf_unfiltered (gdb_stdlog,
			"got oracle request for address of %s\n", identifier);

  /* We can't allow exceptions to escape out of this callback.  Safest
     is to simply emit a gcc error.  */
  TRY
    {
      struct symbol *sym
	= lookup_symbol (identifier, nullptr, VAR_DOMAIN, nullptr).symbol;

      if (sym != nullptr && SYMBOL_CLASS (sym) == LOC_BLOCK)
	{
	  if (compile_debug)
	    fprintf_unfiltered (gdb_stdlog,
				"gcc_symbol_address \"%s\": full symbol\n",
				identifier);
	  result = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
	  if (TYPE_GNU_IFUNC (SYMBOL_TYPE (sym)))
	    result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
	  found = 1;
	}
      else
	{
	  struct bound_minimal_symbol msym;

	  msym = lookup_bound_minimal_symbol (identifier);
	  if (msym.minsym != nullptr)
	    {
	      if (compile_debug)
		fprintf_unfiltered (gdb_stdlog,
				    "gcc_symbol_address \"%s\": minimal "
				    "symbol\n",
				    identifier);
	      result = BMSYMBOL_VALUE_ADDRESS (msym);
	      if (MSYMBOL_TYPE (msym.minsym) == mst_text_gnu_ifunc)
		result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
	      found = 1;
	    }
	}
    }

  CATCH (e, RETURN_MASK_ERROR)
    {
      instance->plugin ().error (e.message);
    }
  END_CATCH

  if (compile_debug && !found)
    fprintf_unfiltered (gdb_stdlog,
			"gcc_symbol_address \"%s\": failed\n",
			identifier);

  if (compile_debug)
    {
      if (found)
	fprintf_unfiltered (gdb_stdlog, "found address for %s!\n", identifier);
      else
	fprintf_unfiltered (gdb_stdlog,
			    "did not find address for %s\n", identifier);
    }

  return result;
}
Commit	Line	Data
078a0207 KS	1	/* Convert symbols from GDB to GCC
	2
	3	Copyright (C) 2014-2018 Free Software Foundation, Inc.
	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
	21	#include "defs.h"
	22	#include "compile-internal.h"
	23	#include "compile-cplus.h"
	24	#include "gdb_assert.h"
	25	#include "symtab.h"
	26	#include "parser-defs.h"
	27	#include "block.h"
	28	#include "objfiles.h"
	29	#include "compile.h"
	30	#include "value.h"
	31	#include "exceptions.h"
	32	#include "gdbtypes.h"
	33	#include "dwarf2loc.h"
	34	#include "cp-support.h"
	35	#include "gdbcmd.h"
	36	#include "compile-c.h"
	37
	38	/* Convert a given symbol, SYM, to the compiler's representation.
	39	INSTANCE is the compiler instance. IS_GLOBAL is true if the
	40	symbol came from the global scope. IS_LOCAL is true if the symbol
	41	came from a local scope. (Note that the two are not strictly
	42	inverses because the symbol might have come from the static
	43	scope.) */
	44
	45	static void
	46	convert_one_symbol (compile_cplus_instance *instance,
	47	struct block_symbol sym, bool is_global, bool is_local)
	48	{
	49	/* Squash compiler warning. */
	50	gcc_type sym_type = 0;
	51	const char *filename = symbol_symtab (sym.symbol)->filename;
	52	unsigned short line = SYMBOL_LINE (sym.symbol);
	53
	54	instance->error_symbol_once (sym.symbol);
	55
	56	if (SYMBOL_CLASS (sym.symbol) == LOC_LABEL)
	57	sym_type = 0;
	58	else
	59	sym_type = instance->convert_type (SYMBOL_TYPE (sym.symbol));
	60
	61	if (SYMBOL_DOMAIN (sym.symbol) == STRUCT_DOMAIN)
	62	{
	63	/* Nothing to do. */
	64	}
65	else
66	{
67	/* Squash compiler warning. */
68	gcc_cp_symbol_kind_flags kind = GCC_CP_FLAG_BASE;
69	CORE_ADDR addr = 0;
70	std::string name;
71	gdb::unique_xmalloc_ptr<char> symbol_name;
72
73	switch (SYMBOL_CLASS (sym.symbol))
74	{
75	case LOC_TYPEDEF:
76	if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_TYPEDEF)
77	kind = GCC_CP_SYMBOL_TYPEDEF;
78	else if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_NAMESPACE)
79	return;
80	break;
81
82	case LOC_LABEL:
83	kind = GCC_CP_SYMBOL_LABEL;
84	addr = SYMBOL_VALUE_ADDRESS (sym.symbol);
85	break;
86
87	case LOC_BLOCK:
88	{
89	kind = GCC_CP_SYMBOL_FUNCTION;
90	addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym.symbol));
91	if (is_global && TYPE_GNU_IFUNC (SYMBOL_TYPE (sym.symbol)))
92	addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
93	}
94	break;
95
96	case LOC_CONST:
97	if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_ENUM)
98	{
99	/* Already handled by convert_enum. */
100	return;
101	}
102	instance->plugin ().build_constant
103	(sym_type, SYMBOL_NATURAL_NAME (sym.symbol),
104	SYMBOL_VALUE (sym.symbol), filename, line);
105	return;
106
107	case LOC_CONST_BYTES:
108	error (_("Unsupported LOC_CONST_BYTES for symbol \"%s\"."),
109	SYMBOL_PRINT_NAME (sym.symbol));
110
111	case LOC_UNDEF:
112	internal_error (__FILE__, __LINE__, _("LOC_UNDEF found for \"%s\"."),
113	SYMBOL_PRINT_NAME (sym.symbol));
114
115	case LOC_COMMON_BLOCK:
116	error (_("Fortran common block is unsupported for compilation "
117	"evaluaton of symbol \"%s\"."),
118	SYMBOL_PRINT_NAME (sym.symbol));
119
120	case LOC_OPTIMIZED_OUT:
121	error (_("Symbol \"%s\" cannot be used for compilation evaluation "
122	"as it is optimized out."),
123	SYMBOL_PRINT_NAME (sym.symbol));
124
125	case LOC_COMPUTED:
126	if (is_local)
127	goto substitution;
128	/* Probably TLS here. */
129	warning (_("Symbol \"%s\" is thread-local and currently can only "
130	"be referenced from the current thread in "
131	"compiled code."),
132	SYMBOL_PRINT_NAME (sym.symbol));
133	/* FALLTHROUGH */
134	case LOC_UNRESOLVED:
135	/* 'symbol_name' cannot be used here as that one is used only for
136	local variables from compile_dwarf_expr_to_c.
137	Global variables can be accessed by GCC only by their address, not
138	by their name. */
139	{
140	struct value *val;
141	struct frame_info *frame = nullptr;
142
143	if (symbol_read_needs_frame (sym.symbol))
144	{
145	frame = get_selected_frame (nullptr);
146	if (frame == nullptr)
147	error (_("Symbol \"%s\" cannot be used because "
148	"there is no selected frame"),
149	SYMBOL_PRINT_NAME (sym.symbol));
150	}
151
152	val = read_var_value (sym.symbol, sym.block, frame);
153	if (VALUE_LVAL (val) != lval_memory)
154	error (_("Symbol \"%s\" cannot be used for compilation "
155	"evaluation as its address has not been found."),
156	SYMBOL_PRINT_NAME (sym.symbol));
157
158	kind = GCC_CP_SYMBOL_VARIABLE;
159	addr = value_address (val);
160	}
161	break;
162
163
164	case LOC_REGISTER:
165	case LOC_ARG:
166	case LOC_REF_ARG:
167	case LOC_REGPARM_ADDR:
168	case LOC_LOCAL:
169	substitution:
170	kind = GCC_CP_SYMBOL_VARIABLE;
171	symbol_name = c_symbol_substitution_name (sym.symbol);
172	break;
173
174	case LOC_STATIC:
175	kind = GCC_CP_SYMBOL_VARIABLE;
176	addr = SYMBOL_VALUE_ADDRESS (sym.symbol);
177	break;
178
179	case LOC_FINAL_VALUE:
180	default:
181	gdb_assert_not_reached ("Unreachable case in convert_one_symbol.");
182	}
183
184	/* Don't emit local variable decls for a raw expression. */
185	if (instance->scope () != COMPILE_I_RAW_SCOPE \|\| symbol_name == nullptr)
186	{
187	compile_scope scope;
188
189	/* For non-local symbols, create/push a new scope so that the
190	symbol is properly scoped to the plug-in. */
191	if (!is_local)
192	{
193	scope
194	= instance->new_scope (SYMBOL_NATURAL_NAME (sym.symbol),
195	SYMBOL_TYPE (sym.symbol));
196	if (scope.nested_type () != GCC_TYPE_NONE)
197	{
198	/* We found a symbol for this type that was defined inside
199	some other symbol, e.g., a class tyepdef defined. */
200	return;
201	}
202
203	instance->enter_scope (scope);
204	}
205
206	/* Get the `raw' name of the symbol. */
207	if (name.empty () && SYMBOL_NATURAL_NAME (sym.symbol) != nullptr)
208	name = compile_cplus_instance::decl_name
209	(SYMBOL_NATURAL_NAME (sym.symbol)).get ();
210
211	/* Define the decl. */
212	instance->plugin ().build_decl
213	("variable", name.c_str (), kind, sym_type,
214	symbol_name.get (), addr, filename, line);
215
216	/* Pop scope for non-local symbols. */
217	if (!is_local)
218	instance->leave_scope ();
219	}
220	}
221	}
222
223	/* Convert a full symbol to its gcc form. CONTEXT is the compiler to
224	use, IDENTIFIER is the name of the symbol, SYM is the symbol
225	itself, and DOMAIN is the domain which was searched. */
226
227	static void
228	convert_symbol_sym (compile_cplus_instance *instance,
229	const char *identifier, struct block_symbol sym,
230	domain_enum domain)
231	{
232	/* If we found a symbol and it is not in the static or global
233	scope, then we should first convert any static or global scope
234	symbol of the same name. This lets this unusual case work:
235
236	int x; // Global.
237	int func(void)
238	{
239	int x;
240	// At this spot, evaluate "extern int x; x"
241	}
242	*/
243
244	const struct block *static_block = block_static_block (sym.block);
245	/* STATIC_BLOCK is NULL if FOUND_BLOCK is the global block. */
246	bool is_local_symbol = (sym.block != static_block && static_block != nullptr);
247	if (is_local_symbol)
248	{
249	struct block_symbol global_sym;
250
251	global_sym = lookup_symbol (identifier, nullptr, domain, nullptr);
252	/* If the outer symbol is in the static block, we ignore it, as
253	it cannot be referenced. */
254	if (global_sym.symbol != nullptr
255	&& global_sym.block != block_static_block (global_sym.block))
256	{
257	if (compile_debug)
258	fprintf_unfiltered (gdb_stdlog,
259	"gcc_convert_symbol \"%s\": global symbol\n",
260	identifier);
261	convert_one_symbol (instance, global_sym, true, false);
262	}
263	}
264
265	if (compile_debug)
266	fprintf_unfiltered (gdb_stdlog,
267	"gcc_convert_symbol \"%s\": local symbol\n",
268	identifier);
269	convert_one_symbol (instance, sym, false, is_local_symbol);
270	}
271
272	/* Convert a minimal symbol to its gcc form. CONTEXT is the compiler
273	to use and BMSYM is the minimal symbol to convert. */
274
275	static void
276	convert_symbol_bmsym (compile_cplus_instance *instance,
277	struct bound_minimal_symbol bmsym)
278	{
279	struct minimal_symbol *msym = bmsym.minsym;
280	struct objfile *objfile = bmsym.objfile;
281	struct type *type;
282	gcc_cp_symbol_kind_flags kind;
283	gcc_type sym_type;
284	CORE_ADDR addr;
285
286	addr = MSYMBOL_VALUE_ADDRESS (objfile, msym);
287
288	/* Conversion copied from write_exp_msymbol. */
289	switch (MSYMBOL_TYPE (msym))
290	{
291	case mst_text:
292	case mst_file_text:
293	case mst_solib_trampoline:
294	type = objfile_type (objfile)->nodebug_text_symbol;
295	kind = GCC_CP_SYMBOL_FUNCTION;
296	break;
297
298	case mst_text_gnu_ifunc:
299	/* nodebug_text_gnu_ifunc_symbol would cause:
300	function return type cannot be function */
301	type = objfile_type (objfile)->nodebug_text_symbol;
302	kind = GCC_CP_SYMBOL_FUNCTION;
303	addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
304	break;
305
306	case mst_data:
307	case mst_file_data:
308	case mst_bss:
309	case mst_file_bss:
310	type = objfile_type (objfile)->nodebug_data_symbol;
311	kind = GCC_CP_SYMBOL_VARIABLE;
312	break;
313
314	case mst_slot_got_plt:
315	type = objfile_type (objfile)->nodebug_got_plt_symbol;
316	kind = GCC_CP_SYMBOL_FUNCTION;
317	break;
318
319	default:
320	type = objfile_type (objfile)->nodebug_unknown_symbol;
321	kind = GCC_CP_SYMBOL_VARIABLE;
322	break;
323	}
324
325	sym_type = instance->convert_type (type);
326	instance->plugin ().push_namespace ("");
327	instance->plugin ().build_decl
328	("minsym", MSYMBOL_NATURAL_NAME (msym), kind, sym_type, nullptr, addr,
329	nullptr, 0);
330	instance->plugin ().pop_binding_level ("");
331	}
332
333	/* See compile-cplus.h. */
334
335	void
336	gcc_cplus_convert_symbol (void *datum,
337	struct gcc_cp_context *gcc_context,
5c889512	338	enum gcc_cp_oracle_request request,
078a0207 KS	339	const char *identifier)
	340	{
	341	if (compile_debug)
	342	fprintf_unfiltered (gdb_stdlog,
	343	"got oracle request for \"%s\"\n", identifier);
	344
	345	bool found = false;
	346	compile_cplus_instance instance = (compile_cplus_instance ) datum;
	347
	348	TRY
	349	{
	350	/* Symbol searching is a three part process unfortunately. */
	351
	352	/* First do a "standard" lookup, converting any found symbols.
	353	This will find variables in the current scope. */
	354
	355	struct block_symbol sym
	356	= lookup_symbol (identifier, instance->block (), VAR_DOMAIN, nullptr);
	357
	358	if (sym.symbol != nullptr)
	359	{
	360	found = true;
	361	convert_symbol_sym (instance, identifier, sym, VAR_DOMAIN);
	362	}
	363
	364	/* Then use linespec.c's multi-symbol search. This should find
	365	all non-variable symbols for which we have debug info. */
	366
	367	symbol_searcher searcher;
	368	searcher.find_all_symbols (identifier, current_language,
	369	ALL_DOMAIN, nullptr, nullptr);
	370
	371	/* Convert any found symbols. */
	372	for (const auto &it : searcher.matching_symbols ())
	373	{
	374	/* Don't convert the symbol found above, if any, twice! */
	375	if (it.symbol != sym.symbol)
	376	{
	377	found = true;
	378	convert_symbol_sym (instance, identifier, it,
	379	SYMBOL_DOMAIN (it.symbol));
	380	}
	381	}
	382
	383	/* Finally, if no symbols have been found, fall back to minsyms. */
	384	if (!found)
	385	{
	386	for (const auto &it : searcher.matching_msymbols ())
	387	{
	388	found = true;
	389	convert_symbol_bmsym (instance, it);
	390	}
	391	}
	392	}
	393	CATCH (e, RETURN_MASK_ALL)
	394	{
	395	/* We can't allow exceptions to escape out of this callback. Safest
	396	is to simply emit a gcc error. */
	397	instance->plugin ().error (e.message);
	398	}
	399	END_CATCH
	400
	401	if (compile_debug && !found)
	402	fprintf_unfiltered (gdb_stdlog,
403	"gcc_convert_symbol \"%s\": lookup_symbol failed\n",
404	identifier);
405
406	if (compile_debug)
407	{
408	if (found)
409	fprintf_unfiltered (gdb_stdlog, "found type for %s\n", identifier);
410	else
411	{
412	fprintf_unfiltered (gdb_stdlog, "did not find type for %s\n",
413	identifier);
414	}
415	}
416
417	return;
418	}
419
420	/* See compile-cplus.h. */
421
422	gcc_address
423	gcc_cplus_symbol_address (void datum, struct gcc_cp_context gcc_context,
424	const char *identifier)
425	{
426	compile_cplus_instance instance = (compile_cplus_instance ) datum;
427	gcc_address result = 0;
428	int found = 0;
429
430	if (compile_debug)
431	fprintf_unfiltered (gdb_stdlog,
432	"got oracle request for address of %s\n", identifier);
433
434	/* We can't allow exceptions to escape out of this callback. Safest
435	is to simply emit a gcc error. */
436	TRY
437	{
438	struct symbol *sym
439	= lookup_symbol (identifier, nullptr, VAR_DOMAIN, nullptr).symbol;
440
441	if (sym != nullptr && SYMBOL_CLASS (sym) == LOC_BLOCK)
442	{
443	if (compile_debug)
444	fprintf_unfiltered (gdb_stdlog,
445	"gcc_symbol_address \"%s\": full symbol\n",
446	identifier);
447	result = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
448	if (TYPE_GNU_IFUNC (SYMBOL_TYPE (sym)))
449	result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
450	found = 1;
451	}
452	else
453	{
454	struct bound_minimal_symbol msym;
455
456	msym = lookup_bound_minimal_symbol (identifier);
457	if (msym.minsym != nullptr)
458	{
459	if (compile_debug)
460	fprintf_unfiltered (gdb_stdlog,
461	"gcc_symbol_address \"%s\": minimal "
462	"symbol\n",
463	identifier);
464	result = BMSYMBOL_VALUE_ADDRESS (msym);
465	if (MSYMBOL_TYPE (msym.minsym) == mst_text_gnu_ifunc)
466	result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
467	found = 1;
468	}
469	}
470	}
471
472	CATCH (e, RETURN_MASK_ERROR)
473	{
474	instance->plugin ().error (e.message);
475	}
476	END_CATCH
477
478	if (compile_debug && !found)
479	fprintf_unfiltered (gdb_stdlog,
480	"gcc_symbol_address \"%s\": failed\n",
481	identifier);
482
483	if (compile_debug)
484	{
485	if (found)
486	fprintf_unfiltered (gdb_stdlog, "found address for %s!\n", identifier);
487	else
488	fprintf_unfiltered (gdb_stdlog,
489	"did not find address for %s\n", identifier);
490	}
491
492	return result;
493	}