92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
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/* DWARF2 frame unwind data structure.
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Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combined
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executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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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 GCC; 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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/* A target can override (perhaps for backward compatibility) how
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many dwarf2 columns are unwound. */
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#ifndef DWARF_FRAME_REGISTERS
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#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
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#endif
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/* The result of interpreting the frame unwind info for a frame.
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This is all symbolic at this point, as none of the values can
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be resolved until the target pc is located. */
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typedef struct
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{
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/* Each register save state can be described in terms of a CFA slot,
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another register, or a location expression. */
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struct frame_state_reg_info
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{
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struct {
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union {
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_Unwind_Word reg;
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_Unwind_Sword offset;
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const unsigned char *exp;
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} loc;
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enum {
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REG_UNSAVED,
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REG_SAVED_OFFSET,
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REG_SAVED_REG,
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REG_SAVED_EXP,
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REG_SAVED_VAL_OFFSET,
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REG_SAVED_VAL_EXP
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} how;
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} reg[DWARF_FRAME_REGISTERS+1];
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/* Used to implement DW_CFA_remember_state. */
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struct frame_state_reg_info *prev;
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} regs;
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/* The CFA can be described in terms of a reg+offset or a
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location expression. */
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_Unwind_Sword cfa_offset;
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_Unwind_Word cfa_reg;
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const unsigned char *cfa_exp;
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enum {
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CFA_UNSET,
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CFA_REG_OFFSET,
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CFA_EXP
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} cfa_how;
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/* The PC described by the current frame state. */
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void *pc;
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/* The information we care about from the CIE/FDE. */
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_Unwind_Personality_Fn personality;
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_Unwind_Sword data_align;
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_Unwind_Word code_align;
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_Unwind_Word retaddr_column;
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unsigned char fde_encoding;
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unsigned char lsda_encoding;
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unsigned char saw_z;
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unsigned char signal_frame;
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void *eh_ptr;
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} _Unwind_FrameState;
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