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Thu, 23 Apr 2026 15:26:57 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.96.134.14]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1B45519560AB; Thu, 23 Apr 2026 15:26:55 +0000 (UTC) From: Guinevere Larsen To: gdb-patches@sourceware.org Cc: Guinevere Larsen Subject: [PATCH v2 5/6] gdb/record: extract the PC to record_full_instruction Date: Thu, 23 Apr 2026 12:26:03 -0300 Message-ID: <20260423152604.171356-6-guinevere@redhat.com> In-Reply-To: <20260423152604.171356-1-guinevere@redhat.com> References: <20260423152604.171356-1-guinevere@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: MNMwzFuiAjV8cfRZGHbJPpW4n0rsLoUbt_jpKANxH7M_1776958017 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org This commit makes it so the PC is not saved as part of the record_full_instruction effects, but rather gets a special location. That is because a couple of commands would really benefit from it being easy to find the PC (especially ones from record-btrace that's haven't been implemented to record-full yet, such as the ones in PR record/18059), while also possibly allowing for one fewer resizing of the effect vector (and saving an entire byte in the process). This commit also refactored record_full_read_entry_from_bfd and record_full_write_entry_to_bfd, to make them methods of record_full_reg_entry and record_full_mem_entry, and also creates similar methods for record_full_entry and record_full_instruction. These could be turned into constructors in a future step of c++ification, but it felt like too much change for a single commit. --- gdb/record-full.c | 384 ++++++++++++++++++++++++++++------------------ 1 file changed, 237 insertions(+), 147 deletions(-) diff --git a/gdb/record-full.c b/gdb/record-full.c index d0cd8b66174..05d515f5295 100644 --- a/gdb/record-full.c +++ b/gdb/record-full.c @@ -109,6 +109,14 @@ struct record_full_mem_entry mem_entry_accessible = true; } + /* Create a mem_entry from a bfd file, when restoring a recording. */ + static record_full_mem_entry from_bfd (bfd *cbfd, asection* osec, + int *bfd_offset); + + /* Save this mem entry to a bfd file. */ + void to_bfd (gdb_bfd_ref_ptr obfd, asection *osec, int *bfd_offset, + gdbarch *gdbarch); + gdb_byte *get_loc () { if (len > sizeof (u.buf)) @@ -199,6 +207,14 @@ struct record_full_reg_entry u.ptr = new gdb_byte[len]; } + /* Create a reg_entry from a bfd file, when restoring a recording. */ + static record_full_reg_entry from_bfd (bfd *cbfd, asection* osec, + int *bfd_offset); + + /* Save this reg entry to a bfd file. */ + void to_bfd (gdb_bfd_ref_ptr obfd, asection *osec, int *bfd_offset, + gdbarch *gdbarch); + gdb_byte *get_loc () { if (len > sizeof (u.buf)) @@ -264,6 +280,13 @@ class record_full_entry gdb_assert (mem_type == record_full_mem); } + /* Create a generic entry from a bfd file, when restoring a recording. */ + static void from_bfd (bfd *cbfd, asection* osec, int *bfd_offset); + + /* Save this entry to a bfd file. */ + void to_bfd (gdb_bfd_ref_ptr obfd, asection *osec, int *bfd_offset, + gdbarch *gdbarch); + record_full_reg_entry& reg () { gdb_assert (type () == record_full_reg); @@ -339,6 +362,7 @@ class record_full_entry this one; * sigval: Whether the inferior received a signal while the following instruction was being recorded; + * pc: The Program Counter for where the instruction starts; * effects: A list of record_full_entry structures, each of which describing one effect that the instruction has on the inferior. @@ -353,10 +377,18 @@ struct record_full_instruction uint32_t insn_num; std::optional sigval; std::vector effects; + record_full_reg_entry pc; /* Execute the full instruction. As a side effect, set record_full_stop_reason. */ void exec_insn (regcache *regcache); + + /* Create a full recorded instruction from a bfd. */ + static void from_bfd (bfd *cbfd, asection* osec, int *bfd_offset); + + /* Save this instruction to a bfd file. */ + void to_bfd (gdb_bfd_ref_ptr obfd, asection *osec, int *bfd_offset, + gdbarch *gdbarch); }; /* If true, query if PREC cannot record memory @@ -669,7 +701,10 @@ record_full_arch_list_add_reg (struct regcache *regcache, int regnum) regcache->cooked_read (regnum, rec.get_loc ()); - record_full_arch_list_add (rec); + if (regnum == gdbarch_pc_regnum (regcache->arch ())) + record_full_incomplete_instruction.pc = rec.reg (); + else + record_full_arch_list_add (rec); return 0; } @@ -826,6 +861,7 @@ static enum target_stop_reason record_full_stop_reason void record_full_instruction::exec_insn (regcache *regcache) { + pc.execute (regcache); for (auto &entry : effects) if (entry.execute (regcache)) record_full_stop_reason = TARGET_STOPPED_BY_WATCHPOINT; @@ -2181,68 +2217,86 @@ netorder32 (uint32_t input) return ret; } -static void -record_full_read_entry_from_bfd (bfd *cbfd, asection *osec, int *bfd_offset) +record_full_reg_entry +record_full_reg_entry::from_bfd (bfd *cbfd, asection *osec, int *bfd_offset) { - uint8_t rectype; - uint32_t regnum, len; - uint64_t addr; + uint32_t regnum; regcache *cache = get_thread_regcache (inferior_thread ()); + /* Get register number to regnum. */ + bfdcore_read (cbfd, osec, ®num, sizeof (regnum), + bfd_offset); + regnum = netorder32 (regnum); + + record_full_reg_entry reg (cache->arch (), regnum); + + /* Get val. */ + bfdcore_read (cbfd, osec, reg.get_loc (), + reg.len, bfd_offset); + + if (record_debug) + gdb_printf (gdb_stdlog, + " Reading register %d (1 " + "plus %lu plus %d bytes)\n", + reg.num, + (unsigned long) sizeof (regnum), + reg.len); + return reg; + +} + +record_full_mem_entry +record_full_mem_entry::from_bfd (bfd *cbfd, asection *osec, int *bfd_offset) +{ + uint32_t len; + uint64_t addr; + + /* Get len. */ + bfdcore_read (cbfd, osec, &len, sizeof (len), bfd_offset); + len = netorder32 (len); + + /* Get addr. */ + bfdcore_read (cbfd, osec, &addr, sizeof (addr), + bfd_offset); + addr = netorder64 (addr); + + record_full_mem_entry mem (addr, len); + + /* Get val. */ + bfdcore_read (cbfd, osec, mem.get_loc (), + len, bfd_offset); + + if (record_debug) + gdb_printf (gdb_stdlog, + " Reading memory %s (1 plus " + "%lu plus %lu plus %d bytes)\n", + paddress (get_current_arch (), + mem.addr), + (unsigned long) sizeof (addr), + (unsigned long) sizeof (len), + len); + + return mem; +} + +void +record_full_entry::from_bfd (bfd *cbfd, asection *osec, int *bfd_offset) +{ + uint8_t rectype; + record_full_entry rec; + bfdcore_read (cbfd, osec, &rectype, sizeof (rectype), bfd_offset); switch (rectype) { case record_full_reg: /* reg */ { - /* Get register number to regnum. */ - bfdcore_read (cbfd, osec, ®num, sizeof (regnum), bfd_offset); - regnum = netorder32 (regnum); - - record_full_entry rec (record_full_reg, cache->arch (), regnum); - - /* Get val. */ - bfdcore_read (cbfd, osec, rec.get_loc (), - rec.reg ().len, bfd_offset); - - if (record_debug) - gdb_printf (gdb_stdlog, - " Reading register %d (1 " - "plus %lu plus %d bytes)\n", - rec.reg ().num, - (unsigned long) sizeof (regnum), - rec.reg ().len); - - record_full_arch_list_add (rec); + rec.entry = record_full_reg_entry::from_bfd (cbfd, osec, bfd_offset); break; } case record_full_mem: /* mem */ { - /* Get len. */ - bfdcore_read (cbfd, osec, &len, sizeof (len), bfd_offset); - len = netorder32 (len); - - /* Get addr. */ - bfdcore_read (cbfd, osec, &addr, sizeof (addr), - bfd_offset); - addr = netorder64 (addr); - - record_full_entry rec (record_full_mem, addr, len); - - /* Get val. */ - bfdcore_read (cbfd, osec, rec.get_loc (), len, bfd_offset); - - if (record_debug) - gdb_printf (gdb_stdlog, - " Reading memory %s (1 plus " - "%lu plus %lu plus %d bytes)\n", - paddress (get_current_arch (), - rec.mem ().addr), - (unsigned long) sizeof (addr), - (unsigned long) sizeof (len), - len); - - record_full_arch_list_add (rec); + rec.entry = record_full_mem_entry::from_bfd (cbfd, osec, bfd_offset); break; } @@ -2253,6 +2307,39 @@ record_full_read_entry_from_bfd (bfd *cbfd, asection *osec, int *bfd_offset) bfd_get_filename (cbfd))); break; } + record_full_arch_list_add (rec); +} + +void +record_full_instruction::from_bfd (bfd *cbfd, asection *osec, int *bfd_offset) +{ + uint32_t eff_count = 0; + uint8_t sigval; + uint32_t insn_num; + + /* First read the generic information for an instruction. */ + bfdcore_read (cbfd, osec, &sigval, sizeof (uint8_t), bfd_offset); + bfdcore_read (cbfd, osec, &eff_count, sizeof (uint32_t), + bfd_offset); + bfdcore_read (cbfd, osec, &insn_num, sizeof (uint32_t), + bfd_offset); + + record_full_incomplete_instruction.insn_num = netorder32 (insn_num); + if (sigval != GDB_SIGNAL_0) + record_full_incomplete_instruction.sigval = (gdb_signal) sigval; + + record_full_incomplete_instruction.pc + = record_full_reg_entry::from_bfd (cbfd, osec, bfd_offset); + + eff_count = netorder32 (eff_count); + + /* This deals with all the side effects. */ + while (eff_count > 0) + { + eff_count--; + + record_full_entry::from_bfd (cbfd, osec, bfd_offset); + } } /* Restore the execution log from core file CBFD. */ @@ -2299,30 +2386,8 @@ record_full_restore (struct bfd &cbfd) while (bfd_offset < osec_size) { record_full_reset_incomplete (); - uint32_t eff_count = 0; - uint8_t sigval; - uint32_t insn_num; - /* First read the generic information for an instruction. */ - bfdcore_read (&cbfd, osec, &sigval, sizeof (uint8_t), &bfd_offset); - bfdcore_read (&cbfd, osec, &eff_count, sizeof (uint32_t), - &bfd_offset); - bfdcore_read (&cbfd, osec, &insn_num, sizeof (uint32_t), - &bfd_offset); - - record_full_incomplete_instruction.insn_num = netorder32 (insn_num); - if (sigval != GDB_SIGNAL_0) - record_full_incomplete_instruction.sigval = (gdb_signal) sigval; - - eff_count = netorder32 (eff_count); - - /* This deals with all the side effects. */ - while (eff_count > 0) - { - eff_count--; - - record_full_read_entry_from_bfd (&cbfd, osec, &bfd_offset); - } + record_full_instruction::from_bfd (&cbfd, osec, &bfd_offset); record_full_save_instruction (); } @@ -2378,71 +2443,109 @@ cmd_record_full_restore (const char *args, int from_tty) record_full_open (nullptr, from_tty); } -static void -record_full_write_entry_to_bfd (record_full_entry &entry, - gdb_bfd_ref_ptr obfd, - asection *osec, int *bfd_offset, - struct gdbarch *gdbarch) +void +record_full_reg_entry::to_bfd (gdb_bfd_ref_ptr obfd, + asection *osec, int *bfd_offset, + gdbarch *gdbarch) +{ + uint32_t regnum; + + if (record_debug) + gdb_printf (gdb_stdlog, + " Writing register %d (1 " + "plus %lu plus %d bytes)\n", + this->num, + (unsigned long) sizeof (regnum), + this->len); + + /* Write regnum. */ + regnum = netorder32 (this->num); + bfdcore_write (obfd.get (), osec, ®num, sizeof (regnum), bfd_offset); + + /* Write regval. */ + bfdcore_write (obfd.get (), osec, this->get_loc (), this->len, bfd_offset); +} + +void +record_full_mem_entry::to_bfd (gdb_bfd_ref_ptr obfd, + asection *osec, int *bfd_offset, + gdbarch *gdbarch) +{ + uint32_t len; + uint64_t addr; + + if (record_debug) + gdb_printf (gdb_stdlog, + " Writing memory %s (1 plus " + "%lu plus %lu plus %d bytes)\n", + paddress (gdbarch, this->addr), + (unsigned long) sizeof (addr), + (unsigned long) sizeof (len), + this->len); + + /* Write memlen. */ + len = netorder32 (this->len); + bfdcore_write (obfd.get (), osec, &len, sizeof (len), bfd_offset); + + /* Write memaddr. */ + addr = netorder64 (this->addr); + bfdcore_write (obfd.get (), osec, &addr, sizeof (addr), bfd_offset); + + /* Write memval. */ + bfdcore_write (obfd.get (), osec, this->get_loc (), this->len, bfd_offset); +} + +void +record_full_entry::to_bfd (gdb_bfd_ref_ptr obfd, asection *osec, + int *bfd_offset, gdbarch *gdbarch) { /* Save entry. */ uint8_t type; - uint32_t regnum, len; - uint64_t addr; - type = entry.type (); + type = this->type (); bfdcore_write (obfd.get (), osec, &type, sizeof (type), bfd_offset); switch (type) { case record_full_reg: /* reg */ - { - auto reg = entry.reg (); - if (record_debug) - gdb_printf (gdb_stdlog, - " Writing register %d (1 " - "plus %lu plus %d bytes)\n", - reg.num, - (unsigned long) sizeof (regnum), - reg.len); - - /* Write regnum. */ - regnum = netorder32 (reg.num); - bfdcore_write (obfd.get (), osec, ®num, sizeof (regnum), bfd_offset); - - /* Write regval. */ - bfdcore_write (obfd.get (), osec, entry.get_loc (), reg.len, bfd_offset); - break; - } + reg ().to_bfd (obfd, osec, bfd_offset, gdbarch); + break; case record_full_mem: /* mem */ - { - auto mem = entry.mem (); - if (record_debug) - gdb_printf (gdb_stdlog, - " Writing memory %s (1 plus " - "%lu plus %lu plus %d bytes)\n", - paddress (gdbarch, mem.addr), - (unsigned long) sizeof (addr), - (unsigned long) sizeof (len), - mem.len); - - /* Write memlen. */ - len = netorder32 (mem.len); - bfdcore_write (obfd.get (), osec, &len, sizeof (len), bfd_offset); - - /* Write memaddr. */ - addr = netorder64 (mem.addr); - bfdcore_write (obfd.get (), osec, &addr, sizeof (addr), bfd_offset); - - /* Write memval. */ - bfdcore_write (obfd.get (), osec, entry.get_loc (), mem.len, - bfd_offset); - break; - } + mem ().to_bfd (obfd, osec, bfd_offset, gdbarch); + break; } } +void +record_full_instruction::to_bfd (gdb_bfd_ref_ptr obfd, asection *osec, + int *bfd_offset, gdbarch *gdbarch) +{ + uint32_t eff_count = (uint32_t) this->effects.size (); + uint32_t insn_num = this->insn_num; + uint8_t sigval = (this->sigval.has_value ()) + ? this->sigval.value () + : GDB_SIGNAL_0; + + /* Signal. */ + bfdcore_write (obfd.get (), osec, &sigval, sizeof (sigval), bfd_offset); + eff_count = netorder32 (eff_count); + /* Number of effects. */ + bfdcore_write (obfd.get (), osec, &eff_count, sizeof (eff_count), + bfd_offset); + /* Instruction number. */ + bfdcore_write (obfd.get (), osec, &insn_num, sizeof (uint32_t), + bfd_offset); + + this->pc.to_bfd (obfd, osec, bfd_offset, gdbarch); + + for (auto &entry : this->effects) + { + entry.to_bfd (obfd, osec, bfd_offset, gdbarch); + } +} + /* Save the execution log to a file. We use a modified elf corefile format, with an extra section for our data. */ @@ -2484,6 +2587,7 @@ record_full_base_target::save_record (const char *recfilename) { /* Number of effects of an instruction. */ save_size += sizeof (uint32_t) + sizeof (uint8_t) + sizeof (uint32_t); + save_size += 4 + record_full_list[i].pc.len; for (auto &entry : record_full_list[i].effects) switch (entry.type ()) { @@ -2525,27 +2629,7 @@ record_full_base_target::save_record (const char *recfilename) record list. */ for (int i = 0; i < record_full_list.size (); i++) { - uint32_t eff_count = (uint32_t) record_full_list[i].effects.size (); - uint32_t insn_num = record_full_list[i].insn_num; - uint8_t sigval = (record_full_list[i].sigval.has_value ()) - ? record_full_list[i].sigval.value () - : GDB_SIGNAL_0; - - /* Signal. */ - bfdcore_write (obfd.get (), osec, &sigval, sizeof (sigval), &bfd_offset); - eff_count = netorder32 (eff_count); - /* Number of effects. */ - bfdcore_write (obfd.get (), osec, &eff_count, sizeof (eff_count), - &bfd_offset); - /* Instruction number. */ - bfdcore_write (obfd.get (), osec, &insn_num, sizeof (uint32_t), - &bfd_offset); - - for (auto &entry : record_full_list[i].effects) - { - record_full_write_entry_to_bfd (entry, obfd, osec, &bfd_offset, - gdbarch); - } + record_full_list[i].to_bfd (obfd, osec, &bfd_offset, gdbarch); /* Execute entry. */ if (i < record_full_next_insn) record_full_list[i].exec_insn (regcache); @@ -2622,6 +2706,9 @@ maintenance_print_record_instruction (const char *args, int from_tty) auto to_print = record_full_list.begin () + offset; gdbarch *arch = current_inferior ()->arch (); + struct value_print_options opts; + get_user_print_options (&opts); + opts.raw = true; for (auto entry : to_print->effects) { @@ -2635,9 +2722,6 @@ maintenance_print_record_instruction (const char *args, int from_tty) entry.get_loc ()); gdb_printf ("Register %s changed: ", gdbarch_register_name (arch, entry.reg ().num)); - struct value_print_options opts; - get_user_print_options (&opts); - opts.raw = true; value_print (val, gdb_stdout, &opts); gdb_printf ("\n"); break; @@ -2656,6 +2740,12 @@ maintenance_print_record_instruction (const char *args, int from_tty) } } } + type *regtype = gdbarch_register_type (arch, to_print->pc.num); + value *val = value_from_contents (regtype, to_print->pc.get_loc ()); + gdb_printf ("Register %s changed: ", + gdbarch_register_name (arch, to_print->pc.num)); + value_print (val, gdb_stdout, &opts); + gdb_printf ("\n"); } INIT_GDB_FILE (record_full) -- 2.53.0