diff options
Diffstat (limited to 'gdb/dwarf2')
| -rw-r--r-- | gdb/dwarf2/frame-tailcall.c | 37 |
1 files changed, 1 insertions, 36 deletions
diff --git a/gdb/dwarf2/frame-tailcall.c b/gdb/dwarf2/frame-tailcall.c index 16dba2b..2d219f1 100644 --- a/gdb/dwarf2/frame-tailcall.c +++ b/gdb/dwarf2/frame-tailcall.c @@ -384,43 +384,8 @@ dwarf2_tailcall_sniffer_first (struct frame_info *this_frame, prev_gdbarch = frame_unwind_arch (this_frame); - /* The dwarf2 tailcall sniffer runs early, at the end of populating the - dwarf2 frame cache for the current frame. If there exists inline - frames inner (next) to the current frame, there is a good possibility - of that inline frame not having a computed frame id yet. - - This is because computing such a frame id requires us to walk through - the frame chain until we find the first normal frame after the inline - frame and then compute the normal frame's id first. - - Some architectures' compilers generate enough register location - information for a dwarf unwinder to fetch PC without relying on inner - frames (x86_64 for example). In this case the PC is retrieved - according to dwarf rules. - - But others generate less strict dwarf data for which assumptions are - made (like interpreting DWARF2_FRAME_REG_UNSPECIFIED as - DWARF2_FRAME_REG_SAME_VALUE). For such cases, GDB may attempt to - create lazy values for registers, and those lazy values must be - created with a valid frame id, but we potentially have no valid id. - - So, to avoid breakage, if we see a dangerous situation with inline - frames without a computed id, use safer functions to retrieve the - current frame's PC. Otherwise use the provided dwarf rules. */ - frame_info *next_frame = get_next_frame (this_frame); - /* Simulate frame_unwind_pc without setting this_frame->prev_pc.p. */ - if (next_frame != nullptr && get_frame_type (next_frame) == INLINE_FRAME - && !frame_id_computed_p (next_frame)) - { - /* The next frame is an inline frame and its frame id has not been - computed yet. */ - get_frame_register (this_frame, gdbarch_pc_regnum (prev_gdbarch), - (gdb_byte *) &prev_pc); - prev_pc = gdbarch_addr_bits_remove (prev_gdbarch, prev_pc); - } - else - prev_pc = gdbarch_unwind_pc (prev_gdbarch, this_frame); + prev_pc = gdbarch_unwind_pc (prev_gdbarch, this_frame); /* call_site_find_chain can throw an exception. */ chain = call_site_find_chain (prev_gdbarch, prev_pc, this_pc); |