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//===--------------------- Unwind_AIXExtras.cpp -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//
//===----------------------------------------------------------------------===//
// This file is only used for AIX.
#if defined(_AIX)
#include "config.h"
#include "libunwind_ext.h"
#include <sys/debug.h>
namespace libunwind {
// getFuncNameFromTBTable
// Get the function name from its traceback table.
char *getFuncNameFromTBTable(uintptr_t Pc, uint16_t &NameLen,
unw_word_t *Offset) {
uint32_t *p = reinterpret_cast<uint32_t *>(Pc);
*Offset = 0;
// Keep looking forward until a word of 0 is found. The traceback
// table starts at the following word.
while (*p)
p++;
tbtable *TBTable = reinterpret_cast<tbtable *>(p + 1);
if (!TBTable->tb.name_present)
return NULL;
// Get to the name of the function.
p = reinterpret_cast<uint32_t *>(&TBTable->tb_ext);
// Skip field parminfo if it exists.
if (TBTable->tb.fixedparms || TBTable->tb.floatparms)
p++;
// If the tb_offset field exists, get the offset from the start of
// the function to pc. Skip the field.
if (TBTable->tb.has_tboff) {
unw_word_t StartIp =
reinterpret_cast<uintptr_t>(TBTable) - *p - sizeof(uint32_t);
*Offset = Pc - StartIp;
p++;
}
// Skip field hand_mask if it exists.
if (TBTable->tb.int_hndl)
p++;
// Skip fields ctl_info and ctl_info_disp if they exist.
if (TBTable->tb.has_ctl) {
p += 1 + *p;
}
NameLen = *(reinterpret_cast<uint16_t *>(p));
return reinterpret_cast<char *>(p) + sizeof(uint16_t);
}
} // namespace libunwind
#endif // defined(_AIX)
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