From cecac1aba0917b4f87837e3037a84954ac013b5c Mon Sep 17 00:00:00 2001 From: Markus Metzger Date: Mon, 18 Mar 2013 16:47:01 +0100 Subject: [PATCH] record-btrace, frame: supply target-specific unwinder Supply a target-specific frame unwinder for the record-btrace target that does not allow unwinding while replaying. 2013-02-11 Jan Kratochvil Markus Metzger gdb/ * record-btrace.c: Include frame-unwind.h. (record_btrace_frame_unwind_stop_reason) (record_btrace_frame_this_id, record_btrace_frame_prev_register) (record_btrace_frame_sniffer, record_btrace_frame_unwind): New. (init_record_btrace_ops): Install it. --- gdb/ChangeLog | 10 +++++++++ gdb/record-btrace.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 74 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 5ac0183..41bf49b 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,4 +1,14 @@ 2014-01-16 Jan Kratochvil + Markus Metzger + + * record-btrace.c: Include frame-unwind.h. + (record_btrace_frame_unwind_stop_reason) + (record_btrace_frame_this_id, record_btrace_frame_prev_register) + (record_btrace_frame_sniffer, record_btrace_frame_unwind): + New. + (init_record_btrace_ops): Install it. + +2014-01-16 Jan Kratochvil * frame.c (get_frame_unwind_stop_reason): Unconditionally call get_prev_frame_1. diff --git a/gdb/record-btrace.c b/gdb/record-btrace.c index e85e707..146d273 100644 --- a/gdb/record-btrace.c +++ b/gdb/record-btrace.c @@ -33,6 +33,7 @@ #include "symtab.h" #include "filenames.h" #include "regcache.h" +#include "frame-unwind.h" /* The target_ops of record-btrace. */ static struct target_ops record_btrace_ops; @@ -839,6 +840,68 @@ record_btrace_prepare_to_store (struct target_ops *ops, } } +/* Implement stop_reason method for record_btrace_frame_unwind. */ + +static enum unwind_stop_reason +record_btrace_frame_unwind_stop_reason (struct frame_info *this_frame, + void **this_cache) +{ + return UNWIND_UNAVAILABLE; +} + +/* Implement this_id method for record_btrace_frame_unwind. */ + +static void +record_btrace_frame_this_id (struct frame_info *this_frame, void **this_cache, + struct frame_id *this_id) +{ + /* Leave there the outer_frame_id value. */ +} + +/* Implement prev_register method for record_btrace_frame_unwind. */ + +static struct value * +record_btrace_frame_prev_register (struct frame_info *this_frame, + void **this_cache, + int regnum) +{ + throw_error (NOT_AVAILABLE_ERROR, + _("Registers are not available in btrace record history")); +} + +/* Implement sniffer method for record_btrace_frame_unwind. */ + +static int +record_btrace_frame_sniffer (const struct frame_unwind *self, + struct frame_info *this_frame, + void **this_cache) +{ + struct thread_info *tp; + struct btrace_thread_info *btinfo; + struct btrace_insn_iterator *replay; + + /* THIS_FRAME does not contain a reference to its thread. */ + tp = find_thread_ptid (inferior_ptid); + gdb_assert (tp != NULL); + + return btrace_is_replaying (tp); +} + +/* btrace recording does not store previous memory content, neither the stack + frames content. Any unwinding would return errorneous results as the stack + contents no longer matches the changed PC value restored from history. + Therefore this unwinder reports any possibly unwound registers as + . */ + +static const struct frame_unwind record_btrace_frame_unwind = +{ + NORMAL_FRAME, + record_btrace_frame_unwind_stop_reason, + record_btrace_frame_this_id, + record_btrace_frame_prev_register, + NULL, + record_btrace_frame_sniffer +}; /* Initialize the record-btrace target ops. */ static void @@ -869,6 +932,7 @@ init_record_btrace_ops (void) ops->to_fetch_registers = record_btrace_fetch_registers; ops->to_store_registers = record_btrace_store_registers; ops->to_prepare_to_store = record_btrace_prepare_to_store; + ops->to_get_unwinder = &record_btrace_frame_unwind; ops->to_stratum = record_stratum; ops->to_magic = OPS_MAGIC; } -- 2.7.4