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dbghelp: SymFromAddr: Handle 2 or more symbols at the same address correct. 

Signed-off-by: Andreas Maier <staubim@quantentunnel.de>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Andreas Maier 2018-11-25 10:15:50 +01:00 committed by Alexandre Julliard
parent 6c3418914d
commit d614ac4671
1 changed files with 35 additions and 19 deletions
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54
dlls/dbghelp/symbol.c
View File

@ -850,6 +850,33 @@ static void symt_get_length(struct module* module, const struct symt* symt, ULON
*size = 0x1000; /* arbitrary value */
}
/* neede by symt_find_nearest */
int symt_get_best_at(struct module* module, int idx_sorttab)
{
ULONG64 ref_addr;
int idx_sorttab_orig = idx_sorttab;
if (module->addr_sorttab[idx_sorttab]->symt.tag == SymTagPublicSymbol)
{
symt_get_address(&module->addr_sorttab[idx_sorttab]->symt, &ref_addr);
while (idx_sorttab > 0 &&
module->addr_sorttab[idx_sorttab]->symt.tag == SymTagPublicSymbol &&
!cmp_sorttab_addr(module, idx_sorttab - 1, ref_addr))
idx_sorttab--;
if (module->addr_sorttab[idx_sorttab]->symt.tag == SymTagPublicSymbol)
{
idx_sorttab = idx_sorttab_orig;
while (idx_sorttab < module->num_sorttab - 1 &&
module->addr_sorttab[idx_sorttab]->symt.tag == SymTagPublicSymbol &&
!cmp_sorttab_addr(module, idx_sorttab + 1, ref_addr))
idx_sorttab++;
}
/* if no better symbol fond restore original */
if (module->addr_sorttab[idx_sorttab]->symt.tag == SymTagPublicSymbol)
idx_sorttab = idx_sorttab_orig;
}
return idx_sorttab;
}
/* assume addr is in module */
struct symt_ht* symt_find_nearest(struct module* module, DWORD_PTR addr)
{
@ -868,7 +895,12 @@ struct symt_ht* symt_find_nearest(struct module* module, DWORD_PTR addr)
high = module->num_sorttab;
symt_get_address(&module->addr_sorttab[0]->symt, &ref_addr);
if (addr < ref_addr) return NULL;
if (addr <= ref_addr)
{
low = symt_get_best_at(module, 0);
return module->addr_sorttab[low];
}
if (high)
{
symt_get_address(&module->addr_sorttab[high - 1]->symt, &ref_addr);
@ -891,23 +923,7 @@ struct symt_ht* symt_find_nearest(struct module* module, DWORD_PTR addr)
/* If found symbol is a public symbol, check if there are any other entries that
* might also have the same address, but would get better information
*/
if (module->addr_sorttab[low]->symt.tag == SymTagPublicSymbol)
{
symt_get_address(&module->addr_sorttab[low]->symt, &ref_addr);
if (low > 0 &&
module->addr_sorttab[low - 1]->symt.tag != SymTagPublicSymbol &&
!cmp_sorttab_addr(module, low - 1, ref_addr))
low--;
else if (low < module->num_sorttab - 1 &&
module->addr_sorttab[low + 1]->symt.tag != SymTagPublicSymbol &&
!cmp_sorttab_addr(module, low + 1, ref_addr))
low++;
}
/* finally check that we fit into the found symbol */
symt_get_address(&module->addr_sorttab[low]->symt, &ref_addr);
if (addr < ref_addr) return NULL;
symt_get_length(module, &module->addr_sorttab[low]->symt, &ref_size);
if (addr >= ref_addr + ref_size) return NULL;
low = symt_get_best_at(module, low);
return module->addr_sorttab[low];
}
@ -1236,7 +1252,7 @@ BOOL WINAPI SymFromAddr(HANDLE hProcess, DWORD64 Address,
symt_fill_sym_info(&pair, NULL, &sym->symt, Symbol);
if (Displacement)
*Displacement = Address - Symbol->Address;
*Displacement = (Address >= Symbol->Address) ? (Address - Symbol->Address) : (DWORD64)-1;
return TRUE;
}