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wine/dlls/msvcrt/handler4.c
Piotr Caban 75669ea34a ucrtbase: Add __CxxFrameHandler4 implementation.
2023-03-27 11:02:50 +02:00

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/*
* C++ exception handling (ver. 4)
*
* Copyright 2020 Piotr Caban
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <corecrt.h>
#if defined(__x86_64__) && _MSVCR_VER>=140
#include <stdarg.h>
#include <stdlib.h>
#include "wine/exception.h"
#include "wine/debug.h"
#include "cppexcept.h"
#include "msvcrt.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
#define CXX_EXCEPTION 0xe06d7363
static DWORD fls_index;
typedef struct
{
BYTE header;
UINT bbt_flags;
UINT unwind_count;
UINT unwind_map;
UINT tryblock_count;
UINT tryblock_map;
UINT ip_count;
UINT ip_map;
UINT frame;
} cxx_function_descr;
#define FUNC_DESCR_IS_CATCH 0x01
#define FUNC_DESCR_IS_SEPARATED 0x02
#define FUNC_DESCR_BBT 0x04
#define FUNC_DESCR_UNWIND_MAP 0x08
#define FUNC_DESCR_TRYBLOCK_MAP 0x10
#define FUNC_DESCR_EHS 0x20
#define FUNC_DESCR_NO_EXCEPT 0x40
#define FUNC_DESCR_RESERVED 0x80
typedef struct
{
UINT type;
BYTE *prev;
UINT handler;
UINT object;
} unwind_info;
typedef struct
{
BYTE header;
UINT flags;
UINT type_info;
int offset;
UINT handler;
UINT ret_addr[2];
} catchblock_info;
#define CATCHBLOCK_FLAGS 0x01
#define CATCHBLOCK_TYPE_INFO 0x02
#define CATCHBLOCK_OFFSET 0x04
#define CATCHBLOCK_SEPARATED 0x08
#define CATCHBLOCK_RET_ADDR_MASK 0x30
#define CATCHBLOCK_RET_ADDR 0x10
#define CATCHBLOCK_TWO_RET_ADDRS 0x20
#define TYPE_FLAG_CONST 1
#define TYPE_FLAG_VOLATILE 2
#define TYPE_FLAG_REFERENCE 8
#define UNWIND_TYPE_NO_HANDLER 0
#define UNWIND_TYPE_DTOR_OBJ 1
#define UNWIND_TYPE_DTOR_PTR 2
#define UNWIND_TYPE_FRAME 3
#define CONSOLIDATE_UNWIND_PARAMETER_COUNT 10
typedef struct
{
UINT start_level;
UINT end_level;
UINT catch_level;
UINT catchblock_count;
UINT catchblock;
} tryblock_info;
typedef struct
{
UINT ip_off; /* relative to start of function or earlier ipmap_info */
INT state;
} ipmap_info;
typedef struct
{
cxx_frame_info frame_info;
BOOL rethrow;
INT search_state;
INT unwind_state;
EXCEPTION_RECORD *prev_rec;
} cxx_catch_ctx;
typedef struct
{
ULONG64 dest_frame;
ULONG64 orig_frame;
EXCEPTION_RECORD *seh_rec;
DISPATCHER_CONTEXT *dispatch;
const cxx_function_descr *descr;
int trylevel;
} se_translator_ctx;
static UINT decode_uint(BYTE **b)
{
UINT ret;
BYTE *p = *b;
if ((*p & 1) == 0)
{
ret = p[0] >> 1;
p += 1;
}
else if ((*p & 3) == 1)
{
ret = (p[0] >> 2) + (p[1] << 6);
p += 2;
}
else if ((*p & 7) == 3)
{
ret = (p[0] >> 3) + (p[1] << 5) + (p[2] << 13);
p += 3;
}
else if ((*p & 15) == 7)
{
ret = (p[0] >> 4) + (p[1] << 4) + (p[2] << 12) + (p[3] << 20);
p += 4;
}
else
{
FIXME("not implemented - expect crash\n");
ret = 0;
p += 5;
}
*b = p;
return ret;
}
static UINT read_rva(BYTE **b)
{
UINT ret = *(UINT*)(*b);
*b += sizeof(UINT);
return ret;
}
static inline void* rva_to_ptr(UINT rva, ULONG64 base)
{
return rva ? (void*)(base+rva) : NULL;
}
static void read_unwind_info(BYTE **b, unwind_info *ui)
{
BYTE *p = *b;
memset(ui, 0, sizeof(*ui));
ui->type = decode_uint(b);
ui->prev = p - (ui->type >> 2);
ui->type &= 0x3;
switch (ui->type)
{
case UNWIND_TYPE_NO_HANDLER:
break;
case UNWIND_TYPE_DTOR_OBJ:
ui->handler = read_rva(b);
ui->object = decode_uint(b); /* frame offset to object */
break;
case UNWIND_TYPE_DTOR_PTR:
ui->handler = read_rva(b);
ui->object = decode_uint(b); /* frame offset to pointer to object */
break;
case UNWIND_TYPE_FRAME:
ui->handler = read_rva(b);
break;
}
}
static void read_tryblock_info(BYTE **b, tryblock_info *ti, ULONG64 image_base)
{
BYTE *count, *count_end;
ti->start_level = decode_uint(b);
ti->end_level = decode_uint(b);
ti->catch_level = decode_uint(b);
ti->catchblock = read_rva(b);
count = count_end = rva_to_ptr(ti->catchblock, image_base);
if (count)
{
ti->catchblock_count = decode_uint(&count_end);
ti->catchblock += count_end - count;
}
else
{
ti->catchblock_count = 0;
}
}
static BOOL read_catchblock_info(BYTE **b, catchblock_info *ci, DWORD func_rva)
{
BYTE ret_addr_type;
memset(ci, 0, sizeof(*ci));
ci->header = **b;
(*b)++;
if (ci->header & ~(CATCHBLOCK_FLAGS | CATCHBLOCK_TYPE_INFO | CATCHBLOCK_OFFSET |
CATCHBLOCK_SEPARATED | CATCHBLOCK_RET_ADDR_MASK))
{
FIXME("unknown header: %x\n", ci->header);
return FALSE;
}
ret_addr_type = ci->header & CATCHBLOCK_RET_ADDR_MASK;
if (ret_addr_type == (CATCHBLOCK_RET_ADDR | CATCHBLOCK_TWO_RET_ADDRS))
{
FIXME("unsupported ret addr type.\n");
return FALSE;
}
if (ci->header & CATCHBLOCK_FLAGS) ci->flags = decode_uint(b);
if (ci->header & CATCHBLOCK_TYPE_INFO) ci->type_info = read_rva(b);
if (ci->header & CATCHBLOCK_OFFSET) ci->offset = decode_uint(b);
ci->handler = read_rva(b);
if (ci->header & CATCHBLOCK_SEPARATED)
{
if (ret_addr_type == CATCHBLOCK_RET_ADDR || ret_addr_type == CATCHBLOCK_TWO_RET_ADDRS)
ci->ret_addr[0] = read_rva(b);
if (ret_addr_type == CATCHBLOCK_TWO_RET_ADDRS)
ci->ret_addr[1] = read_rva(b);
}
else
{
if (ret_addr_type == CATCHBLOCK_RET_ADDR || ret_addr_type == CATCHBLOCK_TWO_RET_ADDRS)
ci->ret_addr[0] = decode_uint(b) + func_rva;
if (ret_addr_type == CATCHBLOCK_TWO_RET_ADDRS)
ci->ret_addr[1] = decode_uint(b) + func_rva;
}
return TRUE;
}
static void read_ipmap_info(BYTE **b, ipmap_info *ii)
{
ii->ip_off = decode_uint(b);
ii->state = (INT)decode_uint(b) - 1;
}
static inline void dump_type(UINT type_rva, ULONG64 base)
{
const cxx_type_info *type = rva_to_ptr(type_rva, base);
TRACE("flags %x type %x %s offsets %d,%d,%d size %d copy ctor %x(%p)\n",
type->flags, type->type_info, dbgstr_type_info(rva_to_ptr(type->type_info, base)),
type->offsets.this_offset, type->offsets.vbase_descr, type->offsets.vbase_offset,
type->size, type->copy_ctor, rva_to_ptr(type->copy_ctor, base));
}
static void dump_exception_type(const cxx_exception_type *type, ULONG64 base)
{
const cxx_type_info_table *type_info_table = rva_to_ptr(type->type_info_table, base);
UINT i;
TRACE("flags %x destr %x(%p) handler %x(%p) type info %x(%p)\n",
type->flags, type->destructor, rva_to_ptr(type->destructor, base),
type->custom_handler, rva_to_ptr(type->custom_handler, base),
type->type_info_table, type_info_table);
for (i = 0; i < type_info_table->count; i++)
{
TRACE(" %d: ", i);
dump_type(type_info_table->info[i], base);
}
}
static BOOL validate_cxx_function_descr4(const cxx_function_descr *descr, DISPATCHER_CONTEXT *dispatch)
{
ULONG64 image_base = dispatch->ImageBase;
BYTE *unwind_map = rva_to_ptr(descr->unwind_map, image_base);
BYTE *tryblock_map = rva_to_ptr(descr->tryblock_map, image_base);
BYTE *ip_map = rva_to_ptr(descr->ip_map, image_base);
UINT i, j;
char *ip;
TRACE("header 0x%x\n", descr->header);
TRACE("basic block transformations flags: 0x%x\n", descr->bbt_flags);
TRACE("unwind table: 0x%x(%p) %d\n", descr->unwind_map, unwind_map, descr->unwind_count);
for (i = 0; i < descr->unwind_count; i++)
{
BYTE *entry = unwind_map;
unwind_info ui;
read_unwind_info(&unwind_map, &ui);
if (ui.prev < (BYTE*)rva_to_ptr(descr->unwind_map, image_base)) ui.prev = NULL;
TRACE(" %d (%p): type 0x%x prev %p func 0x%x(%p) object 0x%x\n",
i, entry, ui.type, ui.prev, ui.handler,
rva_to_ptr(ui.handler, image_base), ui.object);
}
TRACE("try table: 0x%x(%p) %d\n", descr->tryblock_map, tryblock_map, descr->tryblock_count);
for (i = 0; i < descr->tryblock_count; i++)
{
tryblock_info ti;
BYTE *catchblock;
read_tryblock_info(&tryblock_map, &ti, image_base);
catchblock = rva_to_ptr(ti.catchblock, image_base);
TRACE(" %d: start %d end %d catchlevel %d catch 0x%x(%p) %d\n",
i, ti.start_level, ti.end_level, ti.catch_level,
ti.catchblock, catchblock, ti.catchblock_count);
for (j = 0; j < ti.catchblock_count; j++)
{
catchblock_info ci;
if (!read_catchblock_info(&catchblock, &ci,
dispatch->FunctionEntry->BeginAddress)) return FALSE;
TRACE(" %d: header 0x%x offset %d handler 0x%x(%p) "
"ret addr[0] %#x ret_addr[1] %#x type %#x %s\n", j, ci.header, ci.offset,
ci.handler, rva_to_ptr(ci.handler, image_base),
ci.ret_addr[0], ci.ret_addr[1], ci.type_info,
dbgstr_type_info(rva_to_ptr(ci.type_info, image_base)));
}
}
TRACE("ipmap: 0x%x(%p) %d\n", descr->ip_map, ip_map, descr->ip_count);
ip = rva_to_ptr(dispatch->FunctionEntry->BeginAddress, image_base);
for (i = 0; i < descr->ip_count; i++)
{
ipmap_info ii;
read_ipmap_info(&ip_map, &ii);
ip += ii.ip_off;
TRACE(" %d: ip offset 0x%x (%p) state %d\n", i, ii.ip_off, ip, ii.state);
}
TRACE("establisher frame: %x\n", descr->frame);
return TRUE;
}
static inline int ip_to_state4(BYTE *ip_map, UINT count, DISPATCHER_CONTEXT *dispatch, ULONG64 ip)
{
ULONG64 state_ip;
ipmap_info ii;
int ret = -1;
UINT i;
state_ip = dispatch->ImageBase + dispatch->FunctionEntry->BeginAddress;
for (i = 0; i < count; i++)
{
read_ipmap_info(&ip_map, &ii);
state_ip += ii.ip_off;
if (ip < state_ip) break;
ret = ii.state;
}
TRACE("state %d\n", ret);
return ret;
}
static const cxx_type_info *find_caught_type(cxx_exception_type *exc_type, ULONG64 exc_base,
const type_info *catch_ti, UINT catch_flags)
{
const cxx_type_info_table *type_info_table = rva_to_ptr(exc_type->type_info_table, exc_base);
UINT i;
for (i = 0; i < type_info_table->count; i++)
{
const cxx_type_info *type = rva_to_ptr(type_info_table->info[i], exc_base);
const type_info *ti = rva_to_ptr(type->type_info, exc_base);
if (!catch_ti) return type; /* catch(...) matches any type */
if (catch_ti != ti)
{
if (strcmp( catch_ti->mangled, ti->mangled )) continue;
}
/* type is the same, now check the flags */
if ((exc_type->flags & TYPE_FLAG_CONST) &&
!(catch_flags & TYPE_FLAG_CONST)) continue;
if ((exc_type->flags & TYPE_FLAG_VOLATILE) &&
!(catch_flags & TYPE_FLAG_VOLATILE)) continue;
return type; /* it matched */
}
return NULL;
}
static inline void copy_exception(void *object, ULONG64 frame, DISPATCHER_CONTEXT *dispatch,
const catchblock_info *catchblock, const cxx_type_info *type, ULONG64 exc_base)
{
const type_info *catch_ti = rva_to_ptr(catchblock->type_info, dispatch->ImageBase);
void **dest = rva_to_ptr(catchblock->offset, frame);
if (!catch_ti || !catch_ti->mangled[0]) return;
if (!catchblock->offset) return;
if (catchblock->flags & TYPE_FLAG_REFERENCE)
{
*dest = get_this_pointer(&type->offsets, object);
}
else if (type->flags & CLASS_IS_SIMPLE_TYPE)
{
memmove(dest, object, type->size);
/* if it is a pointer, adjust it */
if (type->size == sizeof(void*)) *dest = get_this_pointer(&type->offsets, *dest);
}
else /* copy the object */
{
if (type->copy_ctor)
{
if (type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS)
{
void (__cdecl *copy_ctor)(void*, void*, int) =
rva_to_ptr(type->copy_ctor, exc_base);
copy_ctor(dest, get_this_pointer(&type->offsets, object), 1);
}
else
{
void (__cdecl *copy_ctor)(void*, void*) =
rva_to_ptr(type->copy_ctor, exc_base);
copy_ctor(dest, get_this_pointer(&type->offsets, object));
}
}
else
memmove(dest, get_this_pointer(&type->offsets,object), type->size);
}
}
static void cxx_local_unwind4(ULONG64 frame, DISPATCHER_CONTEXT *dispatch,
const cxx_function_descr *descr, int trylevel, int last_level)
{
void (__cdecl *handler_dtor)(void *obj, ULONG64 frame);
BYTE *unwind_data, *last;
unwind_info ui;
void *obj;
int i;
if (trylevel == -2)
{
trylevel = ip_to_state4(rva_to_ptr(descr->ip_map, dispatch->ImageBase),
descr->ip_count, dispatch, dispatch->ControlPc);
}
TRACE("current level: %d, last level: %d\n", trylevel, last_level);
if (trylevel<-1 || trylevel>=(int)descr->unwind_count)
{
ERR("invalid trylevel %d\n", trylevel);
terminate();
}
if (trylevel <= last_level) return;
unwind_data = rva_to_ptr(descr->unwind_map, dispatch->ImageBase);
last = unwind_data - 1;
for (i = 0; i < trylevel; i++)
{
BYTE *addr = unwind_data;
read_unwind_info(&unwind_data, &ui);
if (i == last_level) last = addr;
}
while (unwind_data > last)
{
read_unwind_info(&unwind_data, &ui);
unwind_data = ui.prev;
if (ui.handler)
{
handler_dtor = rva_to_ptr(ui.handler, dispatch->ImageBase);
obj = rva_to_ptr(ui.object, frame);
if(ui.type == UNWIND_TYPE_DTOR_PTR)
obj = *(void**)obj;
TRACE("handler: %p object: %p\n", handler_dtor, obj);
handler_dtor(obj, frame);
}
}
}
static LONG CALLBACK cxx_rethrow_filter(PEXCEPTION_POINTERS eptrs, void *c)
{
EXCEPTION_RECORD *rec = eptrs->ExceptionRecord;
cxx_catch_ctx *ctx = c;
if (rec->ExceptionCode == CXX_EXCEPTION && !rec->ExceptionInformation[1] && !rec->ExceptionInformation[2])
return EXCEPTION_EXECUTE_HANDLER;
FlsSetValue(fls_index, (void*)(DWORD_PTR)ctx->search_state);
if (rec->ExceptionCode != CXX_EXCEPTION)
return EXCEPTION_CONTINUE_SEARCH;
if (rec->ExceptionInformation[1] == ctx->prev_rec->ExceptionInformation[1])
ctx->rethrow = TRUE;
return EXCEPTION_CONTINUE_SEARCH;
}
static void CALLBACK cxx_catch_cleanup(BOOL normal, void *c)
{
cxx_catch_ctx *ctx = c;
__CxxUnregisterExceptionObject(&ctx->frame_info, ctx->rethrow);
FlsSetValue(fls_index, (void*)(DWORD_PTR)ctx->unwind_state);
}
static void* WINAPI call_catch_block4(EXCEPTION_RECORD *rec)
{
ULONG64 frame = rec->ExceptionInformation[1];
EXCEPTION_RECORD *prev_rec = (void*)rec->ExceptionInformation[4];
EXCEPTION_RECORD *untrans_rec = (void*)rec->ExceptionInformation[6];
CONTEXT *context = (void*)rec->ExceptionInformation[7];
void* (__cdecl *handler)(ULONG64 unk, ULONG64 rbp) = (void*)rec->ExceptionInformation[5];
EXCEPTION_POINTERS ep = { prev_rec, context };
cxx_catch_ctx ctx;
void *ret_addr = NULL;
TRACE("calling handler %p\n", handler);
ctx.rethrow = FALSE;
__CxxRegisterExceptionObject(&ep, &ctx.frame_info);
ctx.search_state = rec->ExceptionInformation[2];
ctx.unwind_state = rec->ExceptionInformation[3];
ctx.prev_rec = prev_rec;
(*__processing_throw())--;
__TRY
{
__TRY
{
ret_addr = handler(0, frame);
}
__EXCEPT_CTX(cxx_rethrow_filter, &ctx)
{
TRACE("detect rethrow: exception code: %lx\n", prev_rec->ExceptionCode);
ctx.rethrow = TRUE;
FlsSetValue(fls_index, (void*)(DWORD_PTR)ctx.search_state);
if (untrans_rec)
{
__DestructExceptionObject(prev_rec);
RaiseException(untrans_rec->ExceptionCode, untrans_rec->ExceptionFlags,
untrans_rec->NumberParameters, untrans_rec->ExceptionInformation);
}
else
{
RaiseException(prev_rec->ExceptionCode, prev_rec->ExceptionFlags,
prev_rec->NumberParameters, prev_rec->ExceptionInformation);
}
}
__ENDTRY
}
__FINALLY_CTX(cxx_catch_cleanup, &ctx)
FlsSetValue(fls_index, (void*)-2);
TRACE("handler returned %p, ret_addr[0] %#Ix, ret_addr[1] %#Ix.\n",
ret_addr, rec->ExceptionInformation[8], rec->ExceptionInformation[9]);
if (rec->ExceptionInformation[9])
{
if ((ULONG_PTR)ret_addr > 1)
{
ERR("unexpected handler result %p.\n", ret_addr);
abort();
}
return (void*)rec->ExceptionInformation[8 + (ULONG_PTR)ret_addr];
}
return rec->ExceptionInformation[8] ? (void *)rec->ExceptionInformation[8] : ret_addr;
}
static inline BOOL cxx_is_consolidate(const EXCEPTION_RECORD *rec)
{
return rec->ExceptionCode == STATUS_UNWIND_CONSOLIDATE
&& rec->NumberParameters == CONSOLIDATE_UNWIND_PARAMETER_COUNT
&& rec->ExceptionInformation[0] == (ULONG_PTR)call_catch_block4;
}
static inline void find_catch_block4(EXCEPTION_RECORD *rec, CONTEXT *context,
EXCEPTION_RECORD *untrans_rec, ULONG64 frame, DISPATCHER_CONTEXT *dispatch,
const cxx_function_descr *descr, cxx_exception_type *info,
ULONG64 orig_frame, int trylevel)
{
ULONG64 exc_base = (rec->NumberParameters == 4 ? rec->ExceptionInformation[3] : 0);
int *processing_throw = __processing_throw();
EXCEPTION_RECORD catch_record;
BYTE *tryblock_map;
CONTEXT ctx;
UINT i, j;
(*processing_throw)++;
if (trylevel == -2)
{
trylevel = ip_to_state4(rva_to_ptr(descr->ip_map, dispatch->ImageBase),
descr->ip_count, dispatch, dispatch->ControlPc);
}
TRACE("current trylevel: %d\n", trylevel);
tryblock_map = rva_to_ptr(descr->tryblock_map, dispatch->ImageBase);
for (i=0; i<descr->tryblock_count; i++)
{
tryblock_info tryblock;
BYTE *catchblock;
read_tryblock_info(&tryblock_map, &tryblock, dispatch->ImageBase);
if (trylevel < tryblock.start_level) continue;
if (trylevel > tryblock.end_level) continue;
/* got a try block */
catchblock = rva_to_ptr(tryblock.catchblock, dispatch->ImageBase);
for (j=0; j<tryblock.catchblock_count; j++)
{
catchblock_info ci;
read_catchblock_info(&catchblock, &ci, dispatch->FunctionEntry->BeginAddress);
if (info)
{
const cxx_type_info *type = find_caught_type(info, exc_base,
rva_to_ptr(ci.type_info, dispatch->ImageBase),
ci.flags);
if (!type) continue;
TRACE("matched type %p in tryblock %d catchblock %d\n", type, i, j);
/* copy the exception to its destination on the stack */
copy_exception((void*)rec->ExceptionInformation[1],
orig_frame, dispatch, &ci, type, exc_base);
}
else
{
/* no CXX_EXCEPTION only proceed with a catch(...) block*/
if (ci.type_info)
continue;
TRACE("found catch(...) block\n");
}
/* unwind stack and call catch */
memset(&catch_record, 0, sizeof(catch_record));
catch_record.ExceptionCode = STATUS_UNWIND_CONSOLIDATE;
catch_record.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
catch_record.NumberParameters = CONSOLIDATE_UNWIND_PARAMETER_COUNT;
catch_record.ExceptionInformation[0] = (ULONG_PTR)call_catch_block4;
catch_record.ExceptionInformation[1] = orig_frame;
catch_record.ExceptionInformation[2] = tryblock.catch_level;
catch_record.ExceptionInformation[3] = tryblock.start_level;
catch_record.ExceptionInformation[4] = (ULONG_PTR)rec;
catch_record.ExceptionInformation[5] =
(ULONG_PTR)rva_to_ptr(ci.handler, dispatch->ImageBase);
catch_record.ExceptionInformation[6] = (ULONG_PTR)untrans_rec;
catch_record.ExceptionInformation[7] = (ULONG_PTR)context;
if (ci.ret_addr[0])
{
catch_record.ExceptionInformation[8] = (ULONG_PTR)rva_to_ptr(
ci.ret_addr[0], dispatch->ImageBase);
}
if (ci.ret_addr[1])
{
catch_record.ExceptionInformation[9] = (ULONG_PTR)rva_to_ptr(
ci.ret_addr[1], dispatch->ImageBase);
}
RtlUnwindEx((void*)frame, (void*)dispatch->ControlPc, &catch_record, NULL, &ctx, NULL);
}
}
TRACE("no matching catch block found\n");
(*processing_throw)--;
}
static LONG CALLBACK se_translation_filter(EXCEPTION_POINTERS *ep, void *c)
{
se_translator_ctx *ctx = (se_translator_ctx *)c;
EXCEPTION_RECORD *rec = ep->ExceptionRecord;
cxx_exception_type *exc_type;
if (rec->ExceptionCode != CXX_EXCEPTION)
{
TRACE("non-c++ exception thrown in SEH handler: %lx\n", rec->ExceptionCode);
terminate();
}
exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
find_catch_block4(rec, ep->ContextRecord, ctx->seh_rec, ctx->dest_frame, ctx->dispatch,
ctx->descr, exc_type, ctx->orig_frame, ctx->trylevel);
__DestructExceptionObject(rec);
return ExceptionContinueSearch;
}
/* Hacky way to obtain se_translator */
static inline _se_translator_function get_se_translator(void)
{
return __current_exception()[-2];
}
static void check_noexcept( PEXCEPTION_RECORD rec, const cxx_function_descr *descr )
{
if (!(descr->header & FUNC_DESCR_IS_CATCH) &&
rec->ExceptionCode == CXX_EXCEPTION &&
(descr->header & FUNC_DESCR_NO_EXCEPT))
{
ERR("noexcept function propagating exception\n");
terminate();
}
}
static DWORD cxx_frame_handler4(EXCEPTION_RECORD *rec, ULONG64 frame,
CONTEXT *context, DISPATCHER_CONTEXT *dispatch,
const cxx_function_descr *descr, int trylevel)
{
cxx_exception_type *exc_type;
ULONG64 orig_frame = frame;
if (descr->header & FUNC_DESCR_IS_CATCH)
{
TRACE("nested exception detected\n");
orig_frame = *(ULONG64*)rva_to_ptr(descr->frame, frame);
TRACE("setting orig_frame to %Ix\n", orig_frame);
}
if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND))
{
int last_level = -1;
if ((rec->ExceptionFlags & EH_TARGET_UNWIND) && cxx_is_consolidate(rec))
last_level = rec->ExceptionInformation[3];
else if ((rec->ExceptionFlags & EH_TARGET_UNWIND) && rec->ExceptionCode == STATUS_LONGJUMP)
last_level = ip_to_state4(rva_to_ptr(descr->ip_map, dispatch->ImageBase),
descr->ip_count, dispatch, dispatch->TargetIp);
cxx_local_unwind4(orig_frame, dispatch, descr, trylevel, last_level);
return ExceptionContinueSearch;
}
if (!descr->tryblock_map)
{
check_noexcept(rec, descr);
return ExceptionContinueSearch;
}
if (rec->ExceptionCode == CXX_EXCEPTION)
{
if (!rec->ExceptionInformation[1] && !rec->ExceptionInformation[2])
{
TRACE("rethrow detected.\n");
*rec = *(EXCEPTION_RECORD*)*__current_exception();
}
exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
if (TRACE_ON(seh))
{
TRACE("handling C++ exception rec %p frame %Ix descr %p\n", rec, frame, descr);
dump_exception_type(exc_type, rec->ExceptionInformation[3]);
}
}
else
{
_se_translator_function se_translator = get_se_translator();
exc_type = NULL;
TRACE("handling C exception code %lx rec %p frame %Ix descr %p\n",
rec->ExceptionCode, rec, frame, descr);
if (se_translator) {
EXCEPTION_POINTERS except_ptrs;
se_translator_ctx ctx;
ctx.dest_frame = frame;
ctx.orig_frame = orig_frame;
ctx.seh_rec = rec;
ctx.dispatch = dispatch;
ctx.descr = descr;
ctx.trylevel = trylevel;
__TRY
{
except_ptrs.ExceptionRecord = rec;
except_ptrs.ContextRecord = context;
se_translator(rec->ExceptionCode, &except_ptrs);
}
__EXCEPT_CTX(se_translation_filter, &ctx)
{
}
__ENDTRY
}
}
find_catch_block4(rec, context, NULL, frame, dispatch, descr, exc_type, orig_frame, trylevel);
check_noexcept(rec, descr);
return ExceptionContinueSearch;
}
EXCEPTION_DISPOSITION __cdecl __CxxFrameHandler4(EXCEPTION_RECORD *rec,
ULONG64 frame, CONTEXT *context, DISPATCHER_CONTEXT *dispatch)
{
cxx_function_descr descr;
BYTE *p, *count, *count_end;
int trylevel;
TRACE("%p %Ix %p %p\n", rec, frame, context, dispatch);
trylevel = (DWORD_PTR)FlsGetValue(fls_index);
FlsSetValue(fls_index, (void*)-2);
memset(&descr, 0, sizeof(descr));
p = rva_to_ptr(*(UINT*)dispatch->HandlerData, dispatch->ImageBase);
descr.header = *p++;
if ((descr.header & FUNC_DESCR_EHS) &&
rec->ExceptionCode != CXX_EXCEPTION &&
!cxx_is_consolidate(rec) &&
rec->ExceptionCode != STATUS_LONGJUMP)
return ExceptionContinueSearch; /* handle only c++ exceptions */
if (descr.header & ~(FUNC_DESCR_IS_CATCH | FUNC_DESCR_IS_SEPARATED |
FUNC_DESCR_UNWIND_MAP | FUNC_DESCR_TRYBLOCK_MAP | FUNC_DESCR_EHS |
FUNC_DESCR_NO_EXCEPT))
{
FIXME("unsupported flags: %x\n", descr.header);
return ExceptionContinueSearch;
}
if (descr.header & FUNC_DESCR_BBT) descr.bbt_flags = decode_uint(&p);
if (descr.header & FUNC_DESCR_UNWIND_MAP)
{
descr.unwind_map = read_rva(&p);
count_end = count = rva_to_ptr(descr.unwind_map, dispatch->ImageBase);
descr.unwind_count = decode_uint(&count_end);
descr.unwind_map += count_end - count;
}
if (descr.header & FUNC_DESCR_TRYBLOCK_MAP)
{
descr.tryblock_map = read_rva(&p);
count_end = count = rva_to_ptr(descr.tryblock_map, dispatch->ImageBase);
descr.tryblock_count = decode_uint(&count_end);
descr.tryblock_map += count_end - count;
}
descr.ip_map = read_rva(&p);
if (descr.header & FUNC_DESCR_IS_SEPARATED)
{
UINT i, num, func;
BYTE *map;
map = rva_to_ptr(descr.ip_map, dispatch->ImageBase);
num = decode_uint(&map);
for (i = 0; i < num; i++)
{
func = read_rva(&map);
descr.ip_map = read_rva(&map);
if (func == dispatch->FunctionEntry->BeginAddress)
break;
}
if (i == num)
{
FIXME("function ip_map not found\n");
return ExceptionContinueSearch;
}
}
count_end = count = rva_to_ptr(descr.ip_map, dispatch->ImageBase);
descr.ip_count = decode_uint(&count_end);
descr.ip_map += count_end - count;
if (descr.header & FUNC_DESCR_IS_CATCH) descr.frame = decode_uint(&p);
if (!validate_cxx_function_descr4(&descr, dispatch))
return ExceptionContinueSearch;
return cxx_frame_handler4(rec, frame, context, dispatch, &descr, trylevel);
}
BOOL msvcrt_init_handler4(void)
{
fls_index = FlsAlloc(NULL);
if (fls_index == FLS_OUT_OF_INDEXES)
return FALSE;
msvcrt_attach_handler4();
return TRUE;
}
void msvcrt_attach_handler4(void)
{
FlsSetValue(fls_index, (void*)-2);
}
void msvcrt_free_handler4(void)
{
FlsFree(fls_index);
}
#endif
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