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dbghelp/dwarf: Split dwarf2_virtual_unwind into two functions. 

Signed-off-by: Eric Pouech <eric.pouech@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Eric Pouech 2021-09-26 14:46:55 +02:00 committed by Alexandre Julliard
parent eabeb1da5c
commit 1ecd66200d
1 changed files with 53 additions and 42 deletions
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95
dlls/dbghelp/dwarf.c
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@ -3568,6 +3568,58 @@ static void apply_frame_state(const struct module* module, struct cpu_stack_walk
*context = new_context;
}
static BOOL dwarf2_fetch_frame_info(struct module* module, struct cpu* cpu, LONG_PTR ip, struct frame_info* info)
{
dwarf2_traverse_context_t cie_ctx, fde_ctx;
struct module_format* modfmt;
const unsigned char* end;
DWORD_PTR delta;
modfmt = module->format_info[DFI_DWARF];
if (!modfmt) return FALSE;
memset(info, 0, sizeof(*info));
fde_ctx.data = modfmt->u.dwarf2_info->eh_frame.address;
fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->eh_frame.size;
/* let offsets relative to the eh_frame sections be correctly computed, as we'll map
* in this process the IMAGE section at a different address as the one expected by
* the image
*/
delta = module->module.BaseOfImage + modfmt->u.dwarf2_info->eh_frame.rva -
(DWORD_PTR)modfmt->u.dwarf2_info->eh_frame.address;
if (!dwarf2_get_cie(ip, module, delta, &fde_ctx, &cie_ctx, info, TRUE))
{
fde_ctx.data = modfmt->u.dwarf2_info->debug_frame.address;
fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->debug_frame.size;
delta = module->reloc_delta;
if (!dwarf2_get_cie(ip, module, delta, &fde_ctx, &cie_ctx, info, FALSE))
{
TRACE("Couldn't find information for %lx\n", ip);
return FALSE;
}
}
TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n",
ip, info->ip, info->code_align, info->data_align,
cpu->fetch_regname(cpu->map_dwarf_register(info->retaddr_reg, module, TRUE)));
if (ip != info->ip)
{
execute_cfa_instructions(module, &cie_ctx, ip, info);
if (info->aug_z_format) /* get length of augmentation data */
{
ULONG_PTR len = dwarf2_leb128_as_unsigned(&fde_ctx);
end = fde_ctx.data + len;
}
else end = NULL;
dwarf2_parse_augmentation_ptr(&fde_ctx, info->lsda_encoding, modfmt->u.dwarf2_info->word_size); /* handler_data */
if (end) fde_ctx.data = end;
execute_cfa_instructions(module, &fde_ctx, ip, info);
}
return TRUE;
}
/***********************************************************************
* dwarf2_virtual_unwind
*
@ -3577,56 +3629,15 @@ BOOL dwarf2_virtual_unwind(struct cpu_stack_walk *csw, ULONG_PTR ip,
{
struct module_pair pair;
struct frame_info info;
dwarf2_traverse_context_t cie_ctx, fde_ctx;
struct module_format* modfmt;
const unsigned char* end;
DWORD_PTR delta;
if (!(pair.pcs = process_find_by_handle(csw->hProcess)) ||
!(pair.requested = module_find_by_addr(pair.pcs, ip, DMT_UNKNOWN)) ||
!module_get_debug(&pair))
return FALSE;
modfmt = pair.effective->format_info[DFI_DWARF];
if (!modfmt) return FALSE;
memset(&info, 0, sizeof(info));
fde_ctx.data = modfmt->u.dwarf2_info->eh_frame.address;
fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->eh_frame.size;
/* let offsets relative to the eh_frame sections be correctly computed, as we'll map
* in this process the IMAGE section at a different address as the one expected by
* the image
*/
delta = pair.effective->module.BaseOfImage + modfmt->u.dwarf2_info->eh_frame.rva -
(DWORD_PTR)modfmt->u.dwarf2_info->eh_frame.address;
if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, TRUE))
{
fde_ctx.data = modfmt->u.dwarf2_info->debug_frame.address;
fde_ctx.end_data = fde_ctx.data + modfmt->u.dwarf2_info->debug_frame.size;
delta = pair.effective->reloc_delta;
if (!dwarf2_get_cie(ip, pair.effective, delta, &fde_ctx, &cie_ctx, &info, FALSE))
{
TRACE("Couldn't find information for %lx\n", ip);
return FALSE;
}
}
TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n",
ip, info.ip, info.code_align, info.data_align,
csw->cpu->fetch_regname(csw->cpu->map_dwarf_register(info.retaddr_reg, pair.effective, TRUE)));
if (!dwarf2_fetch_frame_info(pair.effective, csw->cpu, ip, &info)) return FALSE;
/* if at very beginning of function, return and use default unwinder */
if (ip == info.ip) return FALSE;
execute_cfa_instructions(pair.effective, &cie_ctx, ip, &info);
if (info.aug_z_format) /* get length of augmentation data */
{
ULONG_PTR len = dwarf2_leb128_as_unsigned(&fde_ctx);
end = fde_ctx.data + len;
}
else end = NULL;
dwarf2_parse_augmentation_ptr(&fde_ctx, info.lsda_encoding, modfmt->u.dwarf2_info->word_size); /* handler_data */
if (end) fde_ctx.data = end;
execute_cfa_instructions(pair.effective, &fde_ctx, ip, &info);
/* if there is no information about retaddr, use default unwinder */
if (info.state.rules[info.retaddr_reg] == RULE_UNSET) return FALSE;