mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-12-13 05:43:45 +08:00
331075711a
PR libgcc/78064 * unwind-c.c: Include auto-target.h. From-SVN: r241491
246 lines
7.4 KiB
C
246 lines
7.4 KiB
C
/* Supporting functions for C exception handling.
|
|
Copyright (C) 2002-2016 Free Software Foundation, Inc.
|
|
Contributed by Aldy Hernandez <aldy@quesejoda.com>.
|
|
Shamelessly stolen from the Java front end.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "tconfig.h"
|
|
#include "tsystem.h"
|
|
#include "auto-target.h"
|
|
#include "unwind.h"
|
|
#define NO_SIZE_OF_ENCODED_VALUE
|
|
#include "unwind-pe.h"
|
|
|
|
typedef struct
|
|
{
|
|
_Unwind_Ptr Start;
|
|
_Unwind_Ptr LPStart;
|
|
_Unwind_Ptr ttype_base;
|
|
const unsigned char *TType;
|
|
const unsigned char *action_table;
|
|
unsigned char ttype_encoding;
|
|
unsigned char call_site_encoding;
|
|
} lsda_header_info;
|
|
|
|
static const unsigned char *
|
|
parse_lsda_header (struct _Unwind_Context *context, const unsigned char *p,
|
|
lsda_header_info *info)
|
|
{
|
|
_uleb128_t tmp;
|
|
unsigned char lpstart_encoding;
|
|
|
|
info->Start = (context ? _Unwind_GetRegionStart (context) : 0);
|
|
|
|
/* Find @LPStart, the base to which landing pad offsets are relative. */
|
|
lpstart_encoding = *p++;
|
|
if (lpstart_encoding != DW_EH_PE_omit)
|
|
p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart);
|
|
else
|
|
info->LPStart = info->Start;
|
|
|
|
/* Find @TType, the base of the handler and exception spec type data. */
|
|
info->ttype_encoding = *p++;
|
|
if (info->ttype_encoding != DW_EH_PE_omit)
|
|
{
|
|
p = read_uleb128 (p, &tmp);
|
|
info->TType = p + tmp;
|
|
}
|
|
else
|
|
info->TType = 0;
|
|
|
|
/* The encoding and length of the call-site table; the action table
|
|
immediately follows. */
|
|
info->call_site_encoding = *p++;
|
|
p = read_uleb128 (p, &tmp);
|
|
info->action_table = p + tmp;
|
|
|
|
return p;
|
|
}
|
|
|
|
#ifdef __ARM_EABI_UNWINDER__
|
|
/* ARM EABI personality routines must also unwind the stack. */
|
|
#define CONTINUE_UNWINDING \
|
|
do \
|
|
{ \
|
|
if (__gnu_unwind_frame (ue_header, context) != _URC_OK) \
|
|
return _URC_FAILURE; \
|
|
return _URC_CONTINUE_UNWIND; \
|
|
} \
|
|
while (0)
|
|
#else
|
|
#define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND
|
|
#endif
|
|
|
|
#ifdef __USING_SJLJ_EXCEPTIONS__
|
|
#define PERSONALITY_FUNCTION __gcc_personality_sj0
|
|
#define __builtin_eh_return_data_regno(x) x
|
|
#elif defined(__SEH__)
|
|
#define PERSONALITY_FUNCTION __gcc_personality_imp
|
|
#else
|
|
#define PERSONALITY_FUNCTION __gcc_personality_v0
|
|
#endif
|
|
|
|
#ifdef __ARM_EABI_UNWINDER__
|
|
_Unwind_Reason_Code
|
|
PERSONALITY_FUNCTION (_Unwind_State, struct _Unwind_Exception *,
|
|
struct _Unwind_Context *);
|
|
|
|
_Unwind_Reason_Code
|
|
PERSONALITY_FUNCTION (_Unwind_State state,
|
|
struct _Unwind_Exception * ue_header,
|
|
struct _Unwind_Context * context)
|
|
#else
|
|
#if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
|
|
static
|
|
#endif
|
|
_Unwind_Reason_Code
|
|
PERSONALITY_FUNCTION (int, _Unwind_Action, _Unwind_Exception_Class,
|
|
struct _Unwind_Exception *, struct _Unwind_Context *);
|
|
|
|
_Unwind_Reason_Code
|
|
PERSONALITY_FUNCTION (int version,
|
|
_Unwind_Action actions,
|
|
_Unwind_Exception_Class exception_class ATTRIBUTE_UNUSED,
|
|
struct _Unwind_Exception *ue_header,
|
|
struct _Unwind_Context *context)
|
|
#endif
|
|
{
|
|
lsda_header_info info;
|
|
const unsigned char *language_specific_data, *p;
|
|
_Unwind_Ptr landing_pad, ip;
|
|
int ip_before_insn = 0;
|
|
|
|
#ifdef __ARM_EABI_UNWINDER__
|
|
if ((state & _US_ACTION_MASK) != _US_UNWIND_FRAME_STARTING)
|
|
CONTINUE_UNWINDING;
|
|
|
|
/* The dwarf unwinder assumes the context structure holds things like the
|
|
function and LSDA pointers. The ARM implementation caches these in
|
|
the exception header (UCB). To avoid rewriting everything we make a
|
|
virtual scratch register point at the UCB. */
|
|
ip = (_Unwind_Ptr) ue_header;
|
|
_Unwind_SetGR (context, UNWIND_POINTER_REG, ip);
|
|
#else
|
|
if (version != 1)
|
|
return _URC_FATAL_PHASE1_ERROR;
|
|
|
|
/* Currently we only support cleanups for C. */
|
|
if ((actions & _UA_CLEANUP_PHASE) == 0)
|
|
CONTINUE_UNWINDING;
|
|
#endif
|
|
|
|
language_specific_data = (const unsigned char *)
|
|
_Unwind_GetLanguageSpecificData (context);
|
|
|
|
/* If no LSDA, then there are no handlers or cleanups. */
|
|
if (! language_specific_data)
|
|
CONTINUE_UNWINDING;
|
|
|
|
/* Parse the LSDA header. */
|
|
p = parse_lsda_header (context, language_specific_data, &info);
|
|
#ifdef HAVE_GETIPINFO
|
|
ip = _Unwind_GetIPInfo (context, &ip_before_insn);
|
|
#else
|
|
ip = _Unwind_GetIP (context);
|
|
#endif
|
|
if (! ip_before_insn)
|
|
--ip;
|
|
landing_pad = 0;
|
|
|
|
#ifdef __USING_SJLJ_EXCEPTIONS__
|
|
/* The given "IP" is an index into the call-site table, with two
|
|
exceptions -- -1 means no-action, and 0 means terminate. But
|
|
since we're using uleb128 values, we've not got random access
|
|
to the array. */
|
|
if ((int) ip <= 0)
|
|
return _URC_CONTINUE_UNWIND;
|
|
else
|
|
{
|
|
_uleb128_t cs_lp, cs_action;
|
|
do
|
|
{
|
|
p = read_uleb128 (p, &cs_lp);
|
|
p = read_uleb128 (p, &cs_action);
|
|
}
|
|
while (--ip);
|
|
|
|
/* Can never have null landing pad for sjlj -- that would have
|
|
been indicated by a -1 call site index. */
|
|
landing_pad = (_Unwind_Ptr)cs_lp + 1;
|
|
goto found_something;
|
|
}
|
|
#else
|
|
/* Search the call-site table for the action associated with this IP. */
|
|
while (p < info.action_table)
|
|
{
|
|
_Unwind_Ptr cs_start, cs_len, cs_lp;
|
|
_uleb128_t cs_action;
|
|
|
|
/* Note that all call-site encodings are "absolute" displacements. */
|
|
p = read_encoded_value (0, info.call_site_encoding, p, &cs_start);
|
|
p = read_encoded_value (0, info.call_site_encoding, p, &cs_len);
|
|
p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp);
|
|
p = read_uleb128 (p, &cs_action);
|
|
|
|
/* The table is sorted, so if we've passed the ip, stop. */
|
|
if (ip < info.Start + cs_start)
|
|
p = info.action_table;
|
|
else if (ip < info.Start + cs_start + cs_len)
|
|
{
|
|
if (cs_lp)
|
|
landing_pad = info.LPStart + cs_lp;
|
|
goto found_something;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* IP is not in table. No associated cleanups. */
|
|
/* ??? This is where C++ calls std::terminate to catch throw
|
|
from a destructor. */
|
|
CONTINUE_UNWINDING;
|
|
|
|
found_something:
|
|
if (landing_pad == 0)
|
|
{
|
|
/* IP is present, but has a null landing pad.
|
|
No handler to be run. */
|
|
CONTINUE_UNWINDING;
|
|
}
|
|
|
|
_Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
|
|
(_Unwind_Ptr) ue_header);
|
|
_Unwind_SetGR (context, __builtin_eh_return_data_regno (1), 0);
|
|
_Unwind_SetIP (context, landing_pad);
|
|
return _URC_INSTALL_CONTEXT;
|
|
}
|
|
|
|
#if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
|
|
EXCEPTION_DISPOSITION
|
|
__gcc_personality_seh0 (PEXCEPTION_RECORD ms_exc, void *this_frame,
|
|
PCONTEXT ms_orig_context, PDISPATCHER_CONTEXT ms_disp)
|
|
{
|
|
return _GCC_specific_handler (ms_exc, this_frame, ms_orig_context,
|
|
ms_disp, __gcc_personality_imp);
|
|
}
|
|
#endif /* SEH */
|