gcc/dwarf2out.h

   1 /* dwarf2out.h - Various declarations for functions found in dwarf2out.c
   2    Copyright (C) 1998, 1999, 2000, 2003, 2007, 2010, 2011
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_DWARF2OUT_H
  22 #define GCC_DWARF2OUT_H 1
  23
  24 #include "dwarf2.h"     /* ??? Remove this once only used by dwarf2foo.c.  */
  25
  26 typedef struct die_struct *dw_die_ref;
  27 typedef const struct die_struct *const_dw_die_ref;
  28
  29 typedef struct dw_val_struct *dw_val_ref;
  30 typedef struct dw_cfi_struct *dw_cfi_ref;
  31 typedef struct dw_loc_descr_struct *dw_loc_descr_ref;
  32 typedef struct dw_loc_list_struct *dw_loc_list_ref;
  33
  34
  35 /* Call frames are described using a sequence of Call Frame
  36    Information instructions.  The register number, offset
  37    and address fields are provided as possible operands;
  38    their use is selected by the opcode field.  */
  39
  40 enum dw_cfi_oprnd_type {
  41   dw_cfi_oprnd_unused,
  42   dw_cfi_oprnd_reg_num,
  43   dw_cfi_oprnd_offset,
  44   dw_cfi_oprnd_addr,
  45   dw_cfi_oprnd_loc
  46 };
  47
  48 typedef union GTY(()) dw_cfi_oprnd_struct {
  49   unsigned int GTY ((tag ("dw_cfi_oprnd_reg_num"))) dw_cfi_reg_num;
  50   HOST_WIDE_INT GTY ((tag ("dw_cfi_oprnd_offset"))) dw_cfi_offset;
  51   const char * GTY ((tag ("dw_cfi_oprnd_addr"))) dw_cfi_addr;
  52   struct dw_loc_descr_struct * GTY ((tag ("dw_cfi_oprnd_loc"))) dw_cfi_loc;
  53 }
  54 dw_cfi_oprnd;
  55
  56 typedef struct GTY(()) dw_cfi_struct {
  57   enum dwarf_call_frame_info dw_cfi_opc;
  58   dw_cfi_oprnd GTY ((desc ("dw_cfi_oprnd1_desc (%1.dw_cfi_opc)")))
  59     dw_cfi_oprnd1;
  60   dw_cfi_oprnd GTY ((desc ("dw_cfi_oprnd2_desc (%1.dw_cfi_opc)")))
  61     dw_cfi_oprnd2;
  62 }
  63 dw_cfi_node;
  64
  65
  66 typedef vec<dw_cfi_ref, va_gc> *cfi_vec;
  67
  68 typedef struct dw_fde_struct *dw_fde_ref;
  69
  70 /* All call frame descriptions (FDE's) in the GCC generated DWARF
  71    refer to a single Common Information Entry (CIE), defined at
  72    the beginning of the .debug_frame section.  This use of a single
  73    CIE obviates the need to keep track of multiple CIE's
  74    in the DWARF generation routines below.  */
  75
  76 typedef struct GTY(()) dw_fde_struct {
  77   tree decl;
  78   const char *dw_fde_begin;
  79   const char *dw_fde_current_label;
  80   const char *dw_fde_end;
  81   const char *dw_fde_vms_end_prologue;
  82   const char *dw_fde_vms_begin_epilogue;
  83   const char *dw_fde_second_begin;
  84   const char *dw_fde_second_end;
  85   cfi_vec dw_fde_cfi;
  86   int dw_fde_switch_cfi_index; /* Last CFI before switching sections.  */
  87   HOST_WIDE_INT stack_realignment;
  88
  89   unsigned funcdef_number;
  90   unsigned fde_index;
  91
  92   /* Dynamic realign argument pointer register.  */
  93   unsigned int drap_reg;
  94   /* Virtual dynamic realign argument pointer register.  */
  95   unsigned int vdrap_reg;
  96   /* These 3 flags are copied from rtl_data in function.h.  */
  97   unsigned all_throwers_are_sibcalls : 1;
  98   unsigned uses_eh_lsda : 1;
  99   unsigned nothrow : 1;
 100   /* Whether we did stack realign in this call frame.  */
 101   unsigned stack_realign : 1;
 102   /* Whether dynamic realign argument pointer register has been saved.  */
 103   unsigned drap_reg_saved: 1;
 104   /* True iff dw_fde_begin label is in text_section or cold_text_section.  */
 105   unsigned in_std_section : 1;
 106   /* True iff dw_fde_second_begin label is in text_section or
 107      cold_text_section.  */
 108   unsigned second_in_std_section : 1;
 109 }
 110 dw_fde_node;
 111
 112
 113 /* This is how we define the location of the CFA. We use to handle it
 114    as REG + OFFSET all the time,  but now it can be more complex.
 115    It can now be either REG + CFA_OFFSET or *(REG + BASE_OFFSET) + CFA_OFFSET.
 116    Instead of passing around REG and OFFSET, we pass a copy
 117    of this structure.  */
 118 typedef struct GTY(()) cfa_loc {
 119   HOST_WIDE_INT offset;
 120   HOST_WIDE_INT base_offset;
 121   /* REG is in DWARF_FRAME_REGNUM space, *not* normal REGNO space.  */
 122   unsigned int reg;
 123   BOOL_BITFIELD indirect : 1;  /* 1 if CFA is accessed via a dereference.  */
 124   BOOL_BITFIELD in_use : 1;    /* 1 if a saved cfa is stored here.  */
 125 } dw_cfa_location;
 126
 127
 128 /* Each DIE may have a series of attribute/value pairs.  Values
 129    can take on several forms.  The forms that are used in this
 130    implementation are listed below.  */
 131
 132 enum dw_val_class
 133 {
 134   dw_val_class_none,
 135   dw_val_class_addr,
 136   dw_val_class_offset,
 137   dw_val_class_loc,
 138   dw_val_class_loc_list,
 139   dw_val_class_range_list,
 140   dw_val_class_const,
 141   dw_val_class_unsigned_const,
 142   dw_val_class_const_double,
 143   dw_val_class_vec,
 144   dw_val_class_flag,
 145   dw_val_class_die_ref,
 146   dw_val_class_fde_ref,
 147   dw_val_class_lbl_id,
 148   dw_val_class_lineptr,
 149   dw_val_class_str,
 150   dw_val_class_macptr,
 151   dw_val_class_file,
 152   dw_val_class_data8,
 153   dw_val_class_decl_ref,
 154   dw_val_class_vms_delta,
 155   dw_val_class_high_pc
 156 };
 157
 158 /* Describe a floating point constant value, or a vector constant value.  */
 159
 160 typedef struct GTY(()) dw_vec_struct {
 161   unsigned char * GTY((atomic)) array;
 162   unsigned length;
 163   unsigned elt_size;
 164 }
 165 dw_vec_const;
 166
 167 struct addr_table_entry_struct;
 168
 169 /* The dw_val_node describes an attribute's value, as it is
 170    represented internally.  */
 171
 172 typedef struct GTY(()) dw_val_struct {
 173   enum dw_val_class val_class;
 174   struct addr_table_entry_struct * GTY(()) val_entry;
 175   union dw_val_struct_union
 176     {
 177       rtx GTY ((tag ("dw_val_class_addr"))) val_addr;
 178       unsigned HOST_WIDE_INT GTY ((tag ("dw_val_class_offset"))) val_offset;
 179       dw_loc_list_ref GTY ((tag ("dw_val_class_loc_list"))) val_loc_list;
 180       dw_loc_descr_ref GTY ((tag ("dw_val_class_loc"))) val_loc;
 181       HOST_WIDE_INT GTY ((default)) val_int;
 182       unsigned HOST_WIDE_INT GTY ((tag ("dw_val_class_unsigned_const"))) val_unsigned;
 183       double_int GTY ((tag ("dw_val_class_const_double"))) val_double;
 184       dw_vec_const GTY ((tag ("dw_val_class_vec"))) val_vec;
 185       struct dw_val_die_union
 186         {
 187           dw_die_ref die;
 188           int external;
 189         } GTY ((tag ("dw_val_class_die_ref"))) val_die_ref;
 190       unsigned GTY ((tag ("dw_val_class_fde_ref"))) val_fde_index;
 191       struct indirect_string_node * GTY ((tag ("dw_val_class_str"))) val_str;
 192       char * GTY ((tag ("dw_val_class_lbl_id"))) val_lbl_id;
 193       unsigned char GTY ((tag ("dw_val_class_flag"))) val_flag;
 194       struct dwarf_file_data * GTY ((tag ("dw_val_class_file"))) val_file;
 195       unsigned char GTY ((tag ("dw_val_class_data8"))) val_data8[8];
 196       tree GTY ((tag ("dw_val_class_decl_ref"))) val_decl_ref;
 197       struct dw_val_vms_delta_union
 198         {
 199           char * lbl1;
 200           char * lbl2;
 201         } GTY ((tag ("dw_val_class_vms_delta"))) val_vms_delta;
 202     }
 203   GTY ((desc ("%1.val_class"))) v;
 204 }
 205 dw_val_node;
 206
 207 /* Locations in memory are described using a sequence of stack machine
 208    operations.  */
 209
 210 typedef struct GTY(()) dw_loc_descr_struct {
 211   dw_loc_descr_ref dw_loc_next;
 212   ENUM_BITFIELD (dwarf_location_atom) dw_loc_opc : 8;
 213   /* Used to distinguish DW_OP_addr with a direct symbol relocation
 214      from DW_OP_addr with a dtp-relative symbol relocation.  */
 215   unsigned int dtprel : 1;
 216   int dw_loc_addr;
 217   dw_val_node dw_loc_oprnd1;
 218   dw_val_node dw_loc_oprnd2;
 219 }
 220 dw_loc_descr_node;
 221
 222
 223 /* Interface from dwarf2out.c to dwarf2cfi.c.  */
 224 extern struct dw_loc_descr_struct *build_cfa_loc
 225   (dw_cfa_location *, HOST_WIDE_INT);
 226 extern struct dw_loc_descr_struct *build_cfa_aligned_loc
 227   (dw_cfa_location *, HOST_WIDE_INT offset, HOST_WIDE_INT alignment);
 228 extern struct dw_loc_descr_struct *mem_loc_descriptor
 229   (rtx, enum machine_mode mode, enum machine_mode mem_mode,
 230    enum var_init_status);
 231 extern bool loc_descr_equal_p (dw_loc_descr_ref, dw_loc_descr_ref);
 232 extern dw_fde_ref dwarf2out_alloc_current_fde (void);
 233
 234 extern unsigned long size_of_locs (dw_loc_descr_ref);
 235 extern void output_loc_sequence (dw_loc_descr_ref, int);
 236 extern void output_loc_sequence_raw (dw_loc_descr_ref);
 237
 238 /* Interface from dwarf2cfi.c to dwarf2out.c.  */
 239 extern void lookup_cfa_1 (dw_cfi_ref cfi, dw_cfa_location *loc,
 240                           dw_cfa_location *remember);
 241 extern bool cfa_equal_p (const dw_cfa_location *, const dw_cfa_location *);
 242
 243 extern void output_cfi (dw_cfi_ref, dw_fde_ref, int);
 244
 245 extern GTY(()) cfi_vec cie_cfi_vec;
 246
 247 /* Interface from dwarf2*.c to the rest of the compiler.  */
 248 extern enum dw_cfi_oprnd_type dw_cfi_oprnd1_desc
 249   (enum dwarf_call_frame_info cfi);
 250 extern enum dw_cfi_oprnd_type dw_cfi_oprnd2_desc
 251   (enum dwarf_call_frame_info cfi);
 252
 253 extern void output_cfi_directive (FILE *f, struct dw_cfi_struct *cfi);
 254
 255 extern void dwarf2out_decl (tree);
 256 extern void dwarf2out_emit_cfi (dw_cfi_ref cfi);
 257
 258 extern void debug_dwarf (void);
 259 struct die_struct;
 260 extern void debug_dwarf_die (struct die_struct *);
 261 extern void dwarf2out_set_demangle_name_func (const char *(*) (const char *));
 262 #ifdef VMS_DEBUGGING_INFO
 263 extern void dwarf2out_vms_debug_main_pointer (void);
 264 #endif
 265
 266 struct array_descr_info
 267 {
 268   int ndimensions;
 269   tree element_type;
 270   tree base_decl;
 271   tree data_location;
 272   tree allocated;
 273   tree associated;
 274   struct array_descr_dimen
 275     {
 276       tree lower_bound;
 277       tree upper_bound;
 278       tree stride;
 279     } dimen[10];
 280 };
 281
 282 #endif /* GCC_DWARF2OUT_H */