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cafca5eaa0
CFI label name can be freed only after use. * scfi.c (handle_scfi_dot_cfi): Free CFI label name after use. * scfidw2gen.c (scfi_process_cfi_label): Add a comment. Remove TODO on freeing CFI label name.
273 lines
6.7 KiB
C
273 lines
6.7 KiB
C
/* scfidw2gen.c - Support for emission of synthesized Dwarf2 CFI.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "as.h"
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#include "ginsn.h"
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#include "scfi.h"
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#include "dw2gencfi.h"
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#include "subsegs.h"
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#include "scfidw2gen.h"
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#if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN)
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static bool scfi_ignore_warn_once;
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static void
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dot_scfi_ignore (int ignored ATTRIBUTE_UNUSED)
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{
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gas_assert (flag_synth_cfi);
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if (!scfi_ignore_warn_once)
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{
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as_warn (_("SCFI ignores most user-specified CFI directives"));
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scfi_ignore_warn_once = true;
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}
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ignore_rest_of_line ();
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}
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static void
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scfi_process_cfi_label (void)
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{
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char *name;
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ginsnS *ginsn;
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name = read_symbol_name ();
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if (name == NULL)
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return;
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/* Add a new ginsn. */
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ginsn = ginsn_new_phantom (symbol_temp_new_now ());
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frch_ginsn_data_append (ginsn);
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scfi_op_add_cfi_label (ginsn, name);
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/* NB: Can't free NAME here since it will be used later. Free it in
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handle_scfi_dot_cfi after it is unused. */
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demand_empty_rest_of_line ();
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}
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static void
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scfi_process_cfi_signal_frame (void)
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{
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ginsnS *ginsn;
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ginsn = ginsn_new_phantom (symbol_temp_new_now ());
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frch_ginsn_data_append (ginsn);
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scfi_op_add_signal_frame (ginsn);
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}
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static void
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dot_scfi (int arg)
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{
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switch (arg)
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{
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case CFI_label:
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scfi_process_cfi_label ();
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break;
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case CFI_signal_frame:
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scfi_process_cfi_signal_frame ();
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break;
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default:
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abort ();
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}
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}
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const pseudo_typeS scfi_pseudo_table[] =
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{
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{ "cfi_sections", dot_cfi_sections, 0 }, /* No ignore. */
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{ "cfi_signal_frame", dot_scfi, CFI_signal_frame }, /* No ignore. */
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{ "cfi_label", dot_scfi, CFI_label }, /* No ignore. */
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{ "cfi_startproc", dot_scfi_ignore, 0 },
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{ "cfi_endproc", dot_scfi_ignore, 0 },
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{ "cfi_fde_data", dot_scfi_ignore, 0 },
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{ "cfi_def_cfa", dot_scfi_ignore, 0 },
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{ "cfi_def_cfa_register", dot_scfi_ignore, 0 },
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{ "cfi_def_cfa_offset", dot_scfi_ignore, 0 },
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{ "cfi_adjust_cfa_offset", dot_scfi_ignore, 0 },
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{ "cfi_offset", dot_scfi_ignore, 0 },
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{ "cfi_rel_offset", dot_scfi_ignore, 0 },
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{ "cfi_register", dot_scfi_ignore, 0 },
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{ "cfi_return_column", dot_scfi_ignore, 0 },
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{ "cfi_restore", dot_scfi_ignore, 0 },
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{ "cfi_undefined", dot_scfi_ignore, 0 },
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{ "cfi_same_value", dot_scfi_ignore, 0 },
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{ "cfi_remember_state", dot_scfi_ignore, 0 },
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{ "cfi_restore_state", dot_scfi_ignore, 0 },
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{ "cfi_window_save", dot_scfi_ignore, 0 },
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{ "cfi_negate_ra_state", dot_scfi_ignore, 0 },
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{ "cfi_escape", dot_scfi_ignore, 0 },
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{ "cfi_personality", dot_scfi_ignore, 0 },
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{ "cfi_personality_id", dot_scfi_ignore, 0 },
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{ "cfi_lsda", dot_scfi_ignore, 0 },
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{ "cfi_val_encoded_addr", dot_scfi_ignore, 0 },
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{ "cfi_inline_lsda", dot_scfi_ignore, 0 },
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{ "cfi_val_offset", dot_scfi_ignore, 0 },
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{ NULL, NULL, 0 }
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};
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void
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scfi_dot_cfi_startproc (const symbolS *start_sym)
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{
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if (frchain_now->frch_cfi_data != NULL)
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{
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as_bad (_("SCFI: missing previous SCFI endproc marker"));
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return;
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}
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cfi_new_fde ((symbolS *)start_sym);
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cfi_set_sections ();
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frchain_now->frch_cfi_data->cur_cfa_offset = 0;
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/* By default, SCFI machinery assumes .cfi_startproc is used without
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parameter simple. */
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tc_cfi_frame_initial_instructions ();
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if ((all_cfi_sections & CFI_EMIT_target) != 0)
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tc_cfi_startproc ();
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}
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void
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scfi_dot_cfi_endproc (const symbolS *end_sym)
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{
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struct fde_entry *fde_last;
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if (frchain_now->frch_cfi_data == NULL)
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{
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as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
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return;
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}
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fde_last = frchain_now->frch_cfi_data->cur_fde_data;
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cfi_set_last_fde (fde_last);
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cfi_end_fde ((symbolS *)end_sym);
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if ((all_cfi_sections & CFI_EMIT_target) != 0)
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tc_cfi_endproc (fde_last);
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}
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void
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scfi_dot_cfi (int arg, unsigned reg1, unsigned reg2, offsetT offset,
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const char *name, const symbolS *advloc)
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{
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if (frchain_now->frch_cfi_data == NULL)
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{
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as_bad (_("CFI instruction used without previous .cfi_startproc"));
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return;
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}
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/* If the last address was not at the current PC, advance to current. */
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if (frchain_now->frch_cfi_data->last_address != advloc)
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cfi_add_advance_loc ((symbolS *)advloc);
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switch (arg)
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{
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case DW_CFA_offset:
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cfi_add_CFA_offset (reg1, offset);
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break;
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case DW_CFA_val_offset:
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cfi_add_CFA_val_offset (reg1, offset);
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break;
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case CFI_rel_offset:
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cfi_add_CFA_offset (reg1,
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offset - frchain_now->frch_cfi_data->cur_cfa_offset);
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break;
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case DW_CFA_def_cfa:
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cfi_add_CFA_def_cfa (reg1, offset);
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break;
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case DW_CFA_register:
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cfi_add_CFA_register (reg1, reg2);
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break;
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case DW_CFA_def_cfa_register:
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cfi_add_CFA_def_cfa_register (reg1);
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break;
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case DW_CFA_def_cfa_offset:
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cfi_add_CFA_def_cfa_offset (offset);
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break;
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case CFI_adjust_cfa_offset:
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cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
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+ offset);
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break;
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case DW_CFA_restore:
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cfi_add_CFA_restore (reg1);
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break;
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case DW_CFA_remember_state:
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cfi_add_CFA_remember_state ();
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break;
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case DW_CFA_restore_state:
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cfi_add_CFA_restore_state ();
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break;
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case CFI_label:
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cfi_add_label (name);
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break;
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case CFI_signal_frame:
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frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1;
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break;
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/*
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case DW_CFA_undefined:
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for (;;)
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{
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reg1 = cfi_parse_reg ();
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cfi_add_CFA_undefined (reg1);
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SKIP_WHITESPACE ();
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if (*input_line_pointer != ',')
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break;
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++input_line_pointer;
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}
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break;
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case DW_CFA_same_value:
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reg1 = cfi_parse_reg ();
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cfi_add_CFA_same_value (reg1);
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break;
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case CFI_return_column:
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reg1 = cfi_parse_reg ();
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cfi_set_return_column (reg1);
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break;
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case DW_CFA_GNU_window_save:
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cfi_add_CFA_insn (DW_CFA_GNU_window_save);
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break;
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*/
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default:
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abort ();
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}
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}
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#endif
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