| /* Support for printing Modula 2 values for GDB, the GNU debugger. | 
 |  | 
 |    Copyright (C) 1986-2021 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 "value.h" | 
 | #include "valprint.h" | 
 | #include "language.h" | 
 | #include "typeprint.h" | 
 | #include "c-lang.h" | 
 | #include "m2-lang.h" | 
 | #include "target.h" | 
 | #include "cli/cli-style.h" | 
 |  | 
 | static int print_unpacked_pointer (struct type *type, | 
 | 				   CORE_ADDR address, CORE_ADDR addr, | 
 | 				   const struct value_print_options *options, | 
 | 				   struct ui_file *stream); | 
 | static void | 
 | m2_print_array_contents (struct value *val, | 
 | 			 struct ui_file *stream, int recurse, | 
 | 			 const struct value_print_options *options, | 
 | 			 int len); | 
 |  | 
 |  | 
 | /* get_long_set_bounds - assigns the bounds of the long set to low and | 
 | 			 high.  */ | 
 |  | 
 | int | 
 | get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high) | 
 | { | 
 |   int len, i; | 
 |  | 
 |   if (type->code () == TYPE_CODE_STRUCT) | 
 |     { | 
 |       len = type->num_fields (); | 
 |       i = TYPE_N_BASECLASSES (type); | 
 |       if (len == 0) | 
 | 	return 0; | 
 |       *low = type->field (i).type ()->bounds ()->low.const_val (); | 
 |       *high = type->field (len - 1).type ()->bounds ()->high.const_val (); | 
 |       return 1; | 
 |     } | 
 |   error (_("expecting long_set")); | 
 |   return 0; | 
 | } | 
 |  | 
 | static void | 
 | m2_print_long_set (struct type *type, const gdb_byte *valaddr, | 
 | 		   int embedded_offset, CORE_ADDR address, | 
 | 		   struct ui_file *stream) | 
 | { | 
 |   int empty_set        = 1; | 
 |   int element_seen     = 0; | 
 |   LONGEST previous_low = 0; | 
 |   LONGEST previous_high= 0; | 
 |   LONGEST i, low_bound, high_bound; | 
 |   LONGEST field_low, field_high; | 
 |   struct type *range; | 
 |   int len, field; | 
 |   struct type *target; | 
 |   int bitval; | 
 |  | 
 |   type = check_typedef (type); | 
 |  | 
 |   fprintf_filtered (stream, "{"); | 
 |   len = type->num_fields (); | 
 |   if (get_long_set_bounds (type, &low_bound, &high_bound)) | 
 |     { | 
 |       field = TYPE_N_BASECLASSES (type); | 
 |       range = type->field (field).type ()->index_type (); | 
 |     } | 
 |   else | 
 |     { | 
 |       fprintf_styled (stream, metadata_style.style (), | 
 | 		      " %s }", _("<unknown bounds of set>")); | 
 |       return; | 
 |     } | 
 |  | 
 |   target = TYPE_TARGET_TYPE (range); | 
 |  | 
 |   if (get_discrete_bounds (range, &field_low, &field_high)) | 
 |     { | 
 |       for (i = low_bound; i <= high_bound; i++) | 
 | 	{ | 
 | 	  bitval = value_bit_index (type->field (field).type (), | 
 | 				    (TYPE_FIELD_BITPOS (type, field) / 8) + | 
 | 				    valaddr + embedded_offset, i); | 
 | 	  if (bitval < 0) | 
 | 	    error (_("bit test is out of range")); | 
 | 	  else if (bitval > 0) | 
 | 	    { | 
 | 	      previous_high = i; | 
 | 	      if (! element_seen) | 
 | 		{ | 
 | 		  if (! empty_set) | 
 | 		    fprintf_filtered (stream, ", "); | 
 | 		  print_type_scalar (target, i, stream); | 
 | 		  empty_set    = 0; | 
 | 		  element_seen = 1; | 
 | 		  previous_low = i; | 
 | 		} | 
 | 	    } | 
 | 	  else | 
 | 	    { | 
 | 	      /* bit is not set */ | 
 | 	      if (element_seen) | 
 | 		{ | 
 | 		  if (previous_low+1 < previous_high) | 
 | 		    fprintf_filtered (stream, ".."); | 
 | 		  if (previous_low+1 < previous_high) | 
 | 		    print_type_scalar (target, previous_high, stream); | 
 | 		  element_seen = 0; | 
 | 		} | 
 | 	    } | 
 | 	  if (i == field_high) | 
 | 	    { | 
 | 	      field++; | 
 | 	      if (field == len) | 
 | 		break; | 
 | 	      range = type->field (field).type ()->index_type (); | 
 | 	      if (!get_discrete_bounds (range, &field_low, &field_high)) | 
 | 		break; | 
 | 	      target = TYPE_TARGET_TYPE (range); | 
 | 	    } | 
 | 	} | 
 |       if (element_seen) | 
 | 	{ | 
 | 	  if (previous_low+1 < previous_high) | 
 | 	    { | 
 | 	      fprintf_filtered (stream, ".."); | 
 | 	      print_type_scalar (target, previous_high, stream); | 
 | 	    } | 
 | 	  element_seen = 0; | 
 | 	} | 
 |       fprintf_filtered (stream, "}"); | 
 |     } | 
 | } | 
 |  | 
 | static void | 
 | m2_print_unbounded_array (struct value *value, | 
 | 			  struct ui_file *stream, int recurse, | 
 | 			  const struct value_print_options *options) | 
 | { | 
 |   CORE_ADDR addr; | 
 |   LONGEST len; | 
 |   struct value *val; | 
 |  | 
 |   struct type *type = check_typedef (value_type (value)); | 
 |   const gdb_byte *valaddr = value_contents_for_printing (value).data (); | 
 |  | 
 |   addr = unpack_pointer (type->field (0).type (), | 
 | 			 (TYPE_FIELD_BITPOS (type, 0) / 8) + | 
 | 			 valaddr); | 
 |  | 
 |   val = value_at_lazy (TYPE_TARGET_TYPE (type->field (0).type ()), | 
 | 		       addr); | 
 |   len = unpack_field_as_long (type, valaddr, 1); | 
 |  | 
 |   fprintf_filtered (stream, "{");   | 
 |   m2_print_array_contents (val, stream, recurse, options, len); | 
 |   fprintf_filtered (stream, ", HIGH = %d}", (int) len); | 
 | } | 
 |  | 
 | static int | 
 | print_unpacked_pointer (struct type *type, | 
 | 			CORE_ADDR address, CORE_ADDR addr, | 
 | 			const struct value_print_options *options, | 
 | 			struct ui_file *stream) | 
 | { | 
 |   struct gdbarch *gdbarch = type->arch (); | 
 |   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type)); | 
 |   int want_space = 0; | 
 |  | 
 |   if (elttype->code () == TYPE_CODE_FUNC) | 
 |     { | 
 |       /* Try to print what function it points to.  */ | 
 |       print_function_pointer_address (options, gdbarch, addr, stream); | 
 |       /* Return value is irrelevant except for string pointers.  */ | 
 |       return 0; | 
 |     } | 
 |  | 
 |   if (options->addressprint && options->format != 's') | 
 |     { | 
 |       fputs_filtered (paddress (gdbarch, address), stream); | 
 |       want_space = 1; | 
 |     } | 
 |  | 
 |   /* For a pointer to char or unsigned char, also print the string | 
 |      pointed to, unless pointer is null.  */ | 
 |  | 
 |   if (TYPE_LENGTH (elttype) == 1 | 
 |       && elttype->code () == TYPE_CODE_INT | 
 |       && (options->format == 0 || options->format == 's') | 
 |       && addr != 0) | 
 |     { | 
 |       if (want_space) | 
 | 	fputs_filtered (" ", stream); | 
 |       return val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1, | 
 | 			       stream, options); | 
 |     } | 
 |    | 
 |   return 0; | 
 | } | 
 |  | 
 | static void | 
 | print_variable_at_address (struct type *type, | 
 | 			   const gdb_byte *valaddr, | 
 | 			   struct ui_file *stream, | 
 | 			   int recurse, | 
 | 			   const struct value_print_options *options) | 
 | { | 
 |   struct gdbarch *gdbarch = type->arch (); | 
 |   CORE_ADDR addr = unpack_pointer (type, valaddr); | 
 |   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type)); | 
 |  | 
 |   fprintf_filtered (stream, "["); | 
 |   fputs_filtered (paddress (gdbarch, addr), stream); | 
 |   fprintf_filtered (stream, "] : "); | 
 |    | 
 |   if (elttype->code () != TYPE_CODE_UNDEF) | 
 |     { | 
 |       struct value *deref_val = | 
 | 	value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr)); | 
 |  | 
 |       common_val_print (deref_val, stream, recurse, options, current_language); | 
 |     } | 
 |   else | 
 |     fputs_filtered ("???", stream); | 
 | } | 
 |  | 
 |  | 
 | /* m2_print_array_contents - prints out the contents of an | 
 | 			     array up to a max_print values. | 
 | 			     It prints arrays of char as a string | 
 | 			     and all other data types as comma | 
 | 			     separated values.  */ | 
 |  | 
 | static void | 
 | m2_print_array_contents (struct value *val, | 
 | 			 struct ui_file *stream, int recurse, | 
 | 			 const struct value_print_options *options, | 
 | 			 int len) | 
 | { | 
 |   struct type *type = check_typedef (value_type (val)); | 
 |  | 
 |   if (TYPE_LENGTH (type) > 0) | 
 |     { | 
 |       /* For an array of chars, print with string syntax.  */ | 
 |       if (TYPE_LENGTH (type) == 1 && | 
 | 	  ((type->code () == TYPE_CODE_INT) | 
 | 	   || ((current_language->la_language == language_m2) | 
 | 	       && (type->code () == TYPE_CODE_CHAR))) | 
 | 	  && (options->format == 0 || options->format == 's')) | 
 | 	val_print_string (type, NULL, value_address (val), len+1, stream, | 
 | 			  options); | 
 |       else | 
 | 	{ | 
 | 	  fprintf_filtered (stream, "{"); | 
 | 	  value_print_array_elements (val, stream, recurse, options, 0); | 
 | 	  fprintf_filtered (stream, "}"); | 
 | 	} | 
 |     } | 
 | } | 
 |  | 
 | /* Decorations for Modula 2.  */ | 
 |  | 
 | static const struct generic_val_print_decorations m2_decorations = | 
 | { | 
 |   "", | 
 |   " + ", | 
 |   " * I", | 
 |   "TRUE", | 
 |   "FALSE", | 
 |   "void", | 
 |   "{", | 
 |   "}" | 
 | }; | 
 |  | 
 | /* See m2-lang.h.  */ | 
 |  | 
 | void | 
 | m2_language::value_print_inner (struct value *val, struct ui_file *stream, | 
 | 				int recurse, | 
 | 				const struct value_print_options *options) const | 
 | { | 
 |   unsigned len; | 
 |   struct type *elttype; | 
 |   CORE_ADDR addr; | 
 |   const gdb_byte *valaddr = value_contents_for_printing (val).data (); | 
 |   const CORE_ADDR address = value_address (val); | 
 |  | 
 |   struct type *type = check_typedef (value_type (val)); | 
 |   switch (type->code ()) | 
 |     { | 
 |     case TYPE_CODE_ARRAY: | 
 |       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0) | 
 | 	{ | 
 | 	  elttype = check_typedef (TYPE_TARGET_TYPE (type)); | 
 | 	  len = TYPE_LENGTH (type) / TYPE_LENGTH (elttype); | 
 | 	  /* For an array of chars, print with string syntax.  */ | 
 | 	  if (TYPE_LENGTH (elttype) == 1 && | 
 | 	      ((elttype->code () == TYPE_CODE_INT) | 
 | 	       || ((current_language->la_language == language_m2) | 
 | 		   && (elttype->code () == TYPE_CODE_CHAR))) | 
 | 	      && (options->format == 0 || options->format == 's')) | 
 | 	    { | 
 | 	      /* If requested, look for the first null char and only print | 
 | 		 elements up to it.  */ | 
 | 	      if (options->stop_print_at_null) | 
 | 		{ | 
 | 		  unsigned int temp_len; | 
 |  | 
 | 		  /* Look for a NULL char.  */ | 
 | 		  for (temp_len = 0; | 
 | 		       (valaddr[temp_len] | 
 | 			&& temp_len < len && temp_len < options->print_max); | 
 | 		       temp_len++); | 
 | 		  len = temp_len; | 
 | 		} | 
 |  | 
 | 	      printstr (stream, TYPE_TARGET_TYPE (type), valaddr, len, | 
 | 			NULL, 0, options); | 
 | 	    } | 
 | 	  else | 
 | 	    { | 
 | 	      fprintf_filtered (stream, "{"); | 
 | 	      value_print_array_elements (val, stream, recurse, | 
 | 					  options, 0); | 
 | 	      fprintf_filtered (stream, "}"); | 
 | 	    } | 
 | 	  break; | 
 | 	} | 
 |       /* Array of unspecified length: treat like pointer to first elt.  */ | 
 |       print_unpacked_pointer (type, address, address, options, stream); | 
 |       break; | 
 |  | 
 |     case TYPE_CODE_PTR: | 
 |       if (TYPE_CONST (type)) | 
 | 	print_variable_at_address (type, valaddr, stream, recurse, options); | 
 |       else if (options->format && options->format != 's') | 
 | 	value_print_scalar_formatted (val, options, 0, stream); | 
 |       else | 
 | 	{ | 
 | 	  addr = unpack_pointer (type, valaddr); | 
 | 	  print_unpacked_pointer (type, addr, address, options, stream); | 
 | 	} | 
 |       break; | 
 |  | 
 |     case TYPE_CODE_UNION: | 
 |       if (recurse && !options->unionprint) | 
 | 	{ | 
 | 	  fprintf_filtered (stream, "{...}"); | 
 | 	  break; | 
 | 	} | 
 |       /* Fall through.  */ | 
 |     case TYPE_CODE_STRUCT: | 
 |       if (m2_is_long_set (type)) | 
 | 	m2_print_long_set (type, valaddr, 0, address, stream); | 
 |       else if (m2_is_unbounded_array (type)) | 
 | 	m2_print_unbounded_array (val, stream, recurse, options); | 
 |       else | 
 | 	cp_print_value_fields (val, stream, recurse, options, NULL, 0); | 
 |       break; | 
 |  | 
 |     case TYPE_CODE_SET: | 
 |       elttype = type->index_type (); | 
 |       elttype = check_typedef (elttype); | 
 |       if (elttype->is_stub ()) | 
 | 	{ | 
 | 	  fprintf_styled (stream, metadata_style.style (), | 
 | 			  _("<incomplete type>")); | 
 | 	  break; | 
 | 	} | 
 |       else | 
 | 	{ | 
 | 	  struct type *range = elttype; | 
 | 	  LONGEST low_bound, high_bound; | 
 | 	  int i; | 
 | 	  int need_comma = 0; | 
 |  | 
 | 	  fputs_filtered ("{", stream); | 
 |  | 
 | 	  i = get_discrete_bounds (range, &low_bound, &high_bound) ? 0 : -1; | 
 | 	maybe_bad_bstring: | 
 | 	  if (i < 0) | 
 | 	    { | 
 | 	      fputs_styled (_("<error value>"), metadata_style.style (), | 
 | 			    stream); | 
 | 	      goto done; | 
 | 	    } | 
 |  | 
 | 	  for (i = low_bound; i <= high_bound; i++) | 
 | 	    { | 
 | 	      int element = value_bit_index (type, valaddr, i); | 
 |  | 
 | 	      if (element < 0) | 
 | 		{ | 
 | 		  i = element; | 
 | 		  goto maybe_bad_bstring; | 
 | 		} | 
 | 	      if (element) | 
 | 		{ | 
 | 		  if (need_comma) | 
 | 		    fputs_filtered (", ", stream); | 
 | 		  print_type_scalar (range, i, stream); | 
 | 		  need_comma = 1; | 
 |  | 
 | 		  if (i + 1 <= high_bound | 
 | 		      && value_bit_index (type, valaddr, ++i)) | 
 | 		    { | 
 | 		      int j = i; | 
 |  | 
 | 		      fputs_filtered ("..", stream); | 
 | 		      while (i + 1 <= high_bound | 
 | 			     && value_bit_index (type, valaddr, ++i)) | 
 | 			j = i; | 
 | 		      print_type_scalar (range, j, stream); | 
 | 		    } | 
 | 		} | 
 | 	    } | 
 | 	done: | 
 | 	  fputs_filtered ("}", stream); | 
 | 	} | 
 |       break; | 
 |  | 
 |     case TYPE_CODE_RANGE: | 
 |       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type))) | 
 | 	{ | 
 | 	  struct value *v = value_cast (TYPE_TARGET_TYPE (type), val); | 
 | 	  value_print_inner (v, stream, recurse, options); | 
 | 	  break; | 
 | 	} | 
 |       /* FALLTHROUGH */ | 
 |  | 
 |     case TYPE_CODE_REF: | 
 |     case TYPE_CODE_ENUM: | 
 |     case TYPE_CODE_FUNC: | 
 |     case TYPE_CODE_INT: | 
 |     case TYPE_CODE_FLT: | 
 |     case TYPE_CODE_METHOD: | 
 |     case TYPE_CODE_VOID: | 
 |     case TYPE_CODE_ERROR: | 
 |     case TYPE_CODE_UNDEF: | 
 |     case TYPE_CODE_BOOL: | 
 |     case TYPE_CODE_CHAR: | 
 |     default: | 
 |       generic_value_print (val, stream, recurse, options, &m2_decorations); | 
 |       break; | 
 |     } | 
 | } |