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/* DWARF2 frame unwind data structure. |
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Copyright (C) 1997-2013 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 3, or (at your option) |
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any later version. |
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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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Under Section 7 of GPL version 3, you are granted additional |
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permissions described in the GCC Runtime Library Exception, version |
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3.1, as published by the Free Software Foundation. |
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You should have received a copy of the GNU General Public License and |
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a copy of the GCC Runtime Library Exception along with this program; |
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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. */ |
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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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REG_UNDEFINED |
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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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/* 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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} regs; |
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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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