configure.in (GLIBCPP_ENABLE_CXX_FLAGS): Do not pass arguments, let the defaults...
[official-gcc.git] / gcc / unwind-libunwind.c
blobe73db1c56975ede3806999db697ba2d32018f3f1
1 /* Subroutines needed for unwinding stack frames via the libunwind API.
2 Copyright (C) 2002
3 Free Software Foundation, Inc.
4 Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* As a special exception, if you link this library with other files,
24 some of which are compiled with GCC, to produce an executable,
25 this library does not by itself cause the resulting executable
26 to be covered by the GNU General Public License.
27 This exception does not however invalidate any other reasons why
28 the executable file might be covered by the GNU General Public License. */
30 #include "tconfig.h"
31 #include "tsystem.h"
32 #include "unwind.h"
34 #ifndef __USING_SJLJ_EXCEPTIONS__
36 #define UNW_LOCAL_ONLY
38 #include <libunwind.h>
40 typedef struct {
41 _Unwind_Personality_Fn personality;
42 } _Unwind_FrameState;
44 struct _Unwind_Context {
45 unw_cursor_t cursor;
49 /* First come the helper-routines that are needed by unwind.inc. */
51 static _Unwind_Reason_Code
52 uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
54 unw_word_t handler;
56 if (unw_step (&context->cursor) <= 0)
57 return _URC_END_OF_STACK;
59 unw_get_reg (&context->cursor, UNW_REG_HANDLER, &handler);
60 fs->personality = (_Unwind_Personality_Fn) handler;
62 return _URC_NO_REASON;
65 #define uw_update_context(context,fs) do { ; } while (0)
67 static inline _Unwind_Ptr
68 uw_identify_context (struct _Unwind_Context *context)
70 unw_word_t ip;
71 unw_get_reg (&context->cursor, UNW_REG_IP, &ip);
72 return (_Unwind_Ptr) ip;
75 #define uw_init_context(context) \
76 do \
77 { \
78 unw_context_t uc; \
79 unw_getcontext (&uc); \
80 unw_init_local (&(context)->cursor, &uc); \
81 } \
82 while (0)
84 static inline void __attribute__ ((noreturn))
85 uw_install_context (struct _Unwind_Context *current __attribute__ ((unused)),
86 struct _Unwind_Context *target)
88 unw_resume (&(target)->cursor);
89 abort ();
93 /* Now come the helper-routines which may be called from an exception
94 handler. The interface for these routines are defined by the C++
95 ABI. See: http://www.codesourcery.com/cxx-abi/abi-eh.html */
97 _Unwind_Word
98 _Unwind_GetGR (struct _Unwind_Context *context, int index)
100 unw_word_t ret;
102 /* Note: here we depend on the fact that general registers are
103 expected to start with register number 0! */
104 unw_get_reg (&context->cursor, index, &ret);
105 return ret;
108 /* Overwrite the saved value for register REG in CONTEXT with VAL. */
110 void
111 _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
113 /* Note: here we depend on the fact that general registers are
114 expected to start with register number 0! */
115 unw_set_reg (&context->cursor, index, val);
118 /* Retrieve the return address for CONTEXT. */
120 inline _Unwind_Ptr
121 _Unwind_GetIP (struct _Unwind_Context *context)
123 unw_word_t ret;
125 unw_get_reg (&context->cursor, UNW_REG_IP, &ret);
126 return ret;
129 /* Overwrite the return address for CONTEXT with VAL. */
131 inline void
132 _Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
134 unw_set_reg (&context->cursor, UNW_REG_IP, val);
137 void *
138 _Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
140 unw_word_t ret;
142 unw_get_reg (&context->cursor, UNW_REG_LSDA, &ret);
143 return (void *) ret;
146 _Unwind_Ptr
147 _Unwind_GetRegionStart (struct _Unwind_Context *context)
149 unw_word_t ret;
151 unw_get_reg (&context->cursor, UNW_REG_PROC_START, &ret);
152 return (_Unwind_Ptr) ret;
155 #include "unwind.inc"
157 #endif /* !__USING_SJLJ_EXCEPTIONS__ */