remote: multiple remote_arch_state instances per arch
Currently, we associate gdbarch-related remote protocol state on a per-gdbarch data object. Things like the size of the g/G packet, and the max remote packet size. If we'll support being connected to different remote servers at the same time, then we need to cope with each having their own packet sizes, even if they are each debugging programs of the same architecture. I.e., a single instance of remote_arch_state per arch is not sufficient. This patch moves the remote_arch_state object to a map of gdbarch-to-remote_arch_state saved in the remote_state structure. Usually there will only be one entry in the map, though we may see more with stubs that support multi-process and/or archs with multiple ABIs (e.g, one remote_arch_state for 64-bit inferiors and another for 32-bit inferiors). gdb/ChangeLog: 2018-05-22 Pedro Alves <palves@redhat.com> * remote.c: Include <unordered_map>. (remote_state): Now a class. (remote_state) <get_remote_arch_state>: Declare method. <get_remote_arch_state>: New field. (remote_arch_state) <remote_arch_state>: Declare ctor. <regs>: Now a unique_ptr. (remote_gdbarch_data_handle): Delete. (get_remote_arch_state): Delete. (remote_state::get_remote_arch_state): New. (get_remote_state): Adjust to call remote_state's get_remote_arch_state method. (init_remote_state): Delete, bits factored out to ... (remote_arch_state::remote_arch_state): ... this new method. (get_remote_packet_size, get_memory_packet_size) (process_g_packet, remote_target::fetch_registers) (remote_target::prepare_to_store, store_registers_using_G) (remote_target::store_registers, remote_target::get_trace_status): Adjust to call remote_state's method. (_initialize_remote): Remove reference to remote_gdbarch_data_handle.
This commit is contained in:
Pedro Alves
parent
dd194f6b36
commit
9d6eea3132
@ -1,3 +1,26 @@
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2018-05-22 Pedro Alves <palves@redhat.com>
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* remote.c: Include <unordered_map>.
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(remote_state): Now a class.
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(remote_state) <get_remote_arch_state>: Declare method.
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<get_remote_arch_state>: New field.
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(remote_arch_state) <remote_arch_state>: Declare ctor.
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<regs>: Now a unique_ptr.
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(remote_gdbarch_data_handle): Delete.
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(get_remote_arch_state): Delete.
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(remote_state::get_remote_arch_state): New.
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(get_remote_state): Adjust to call remote_state's
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get_remote_arch_state method.
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(init_remote_state): Delete, bits factored out to ...
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(remote_arch_state::remote_arch_state): ... this new method.
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(get_remote_packet_size, get_memory_packet_size)
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(process_g_packet, remote_target::fetch_registers)
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(remote_target::prepare_to_store, store_registers_using_G)
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(remote_target::store_registers, remote_target::get_trace_status):
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Adjust to call remote_state's method.
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(_initialize_remote): Remove reference to
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remote_gdbarch_data_handle.
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2018-05-22 Pedro Alves <palves@redhat.com>
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* remote.c (struct readahead_cache) <invalidate, invalidate_fd,
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108
gdb/remote.c
108
gdb/remote.c
@ -75,6 +75,7 @@
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#include "common/scoped_restore.h"
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#include "environ.h"
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#include "common/byte-vector.h"
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#include <unordered_map>
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/* The remote target. */
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@ -606,11 +607,18 @@ struct readahead_cache
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connected target. This is per-target state, and independent of the
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selected architecture. */
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struct remote_state
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class remote_state
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{
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public:
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remote_state ();
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~remote_state ();
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/* Get the remote arch state for GDBARCH. */
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struct remote_arch_state *get_remote_arch_state (struct gdbarch *gdbarch);
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public: /* data */
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/* A buffer to use for incoming packets, and its current size. The
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buffer is grown dynamically for larger incoming packets.
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Outgoing packets may also be constructed in this buffer.
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@ -736,6 +744,14 @@ struct remote_state
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request/reply nature of the RSP. We only cache data for a single
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file descriptor at a time. */
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struct readahead_cache readahead_cache;
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private:
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/* Mapping of remote protocol data for each gdbarch. Usually there
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is only one entry here, though we may see more with stubs that
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support multi-process. */
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std::unordered_map<struct gdbarch *,
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std::unique_ptr<struct remote_arch_state>>
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m_arch_states;
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};
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/* Private data that we'll store in (struct thread_info)->priv. */
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@ -820,12 +836,14 @@ struct packet_reg
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struct remote_arch_state
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{
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explicit remote_arch_state (struct gdbarch *gdbarch);
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/* Description of the remote protocol registers. */
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long sizeof_g_packet;
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/* Description of the remote protocol registers indexed by REGNUM
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(making an array gdbarch_num_regs in size). */
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struct packet_reg *regs;
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std::unique_ptr<packet_reg[]> regs;
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/* This is the size (in chars) of the first response to the ``g''
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packet. It is used as a heuristic when determining the maximum
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@ -937,15 +955,23 @@ remote_get_noisy_reply ()
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while (1);
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}
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/* Handle for retreving the remote protocol data from gdbarch. */
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static struct gdbarch_data *remote_gdbarch_data_handle;
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static struct remote_arch_state *
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get_remote_arch_state (struct gdbarch *gdbarch)
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struct remote_arch_state *
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remote_state::get_remote_arch_state (struct gdbarch *gdbarch)
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{
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gdb_assert (gdbarch != NULL);
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return ((struct remote_arch_state *)
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gdbarch_data (gdbarch, remote_gdbarch_data_handle));
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auto &rsa = this->m_arch_states[gdbarch];
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if (rsa == nullptr)
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{
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rsa.reset (new remote_arch_state (gdbarch));
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/* Make sure that the packet buffer is plenty big enough for
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this architecture. */
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if (this->buf_size < rsa->remote_packet_size)
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{
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this->buf_size = 2 * rsa->remote_packet_size;
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this->buf = (char *) xrealloc (this->buf, this->buf_size);
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}
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}
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return rsa.get ();
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}
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/* Fetch the global remote target state. */
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@ -953,14 +979,16 @@ get_remote_arch_state (struct gdbarch *gdbarch)
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static struct remote_state *
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get_remote_state (void)
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{
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struct remote_state *rs = get_remote_state_raw ();
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/* Make sure that the remote architecture state has been
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initialized, because doing so might reallocate rs->buf. Any
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function which calls getpkt also needs to be mindful of changes
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to rs->buf, but this call limits the number of places which run
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into trouble. */
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get_remote_arch_state (target_gdbarch ());
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rs->get_remote_arch_state (target_gdbarch ());
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return get_remote_state_raw ();
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return rs;
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}
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/* Cleanup routine for the remote module's pspace data. */
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@ -1102,23 +1130,16 @@ remote_register_number_and_offset (struct gdbarch *gdbarch, int regnum,
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return *pnum != -1;
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}
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static void *
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init_remote_state (struct gdbarch *gdbarch)
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remote_arch_state::remote_arch_state (struct gdbarch *gdbarch)
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{
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struct remote_state *rs = get_remote_state_raw ();
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struct remote_arch_state *rsa;
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rsa = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct remote_arch_state);
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/* Use the architecture to build a regnum<->pnum table, which will be
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1:1 unless a feature set specifies otherwise. */
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rsa->regs = GDBARCH_OBSTACK_CALLOC (gdbarch,
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gdbarch_num_regs (gdbarch),
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struct packet_reg);
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this->regs.reset (new packet_reg [gdbarch_num_regs (gdbarch)] ());
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/* Record the maximum possible size of the g packet - it may turn out
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to be smaller. */
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rsa->sizeof_g_packet = map_regcache_remote_table (gdbarch, rsa->regs);
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this->sizeof_g_packet
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= map_regcache_remote_table (gdbarch, this->regs.get ());
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/* Default maximum number of characters in a packet body. Many
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remote stubs have a hardwired buffer size of 400 bytes
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@ -1127,10 +1148,10 @@ init_remote_state (struct gdbarch *gdbarch)
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NUL character can always fit in the buffer. This stops GDB
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trashing stubs that try to squeeze an extra NUL into what is
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already a full buffer (As of 1999-12-04 that was most stubs). */
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rsa->remote_packet_size = 400 - 1;
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this->remote_packet_size = 400 - 1;
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/* This one is filled in when a ``g'' packet is received. */
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rsa->actual_register_packet_size = 0;
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this->actual_register_packet_size = 0;
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/* Should rsa->sizeof_g_packet needs more space than the
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default, adjust the size accordingly. Remember that each byte is
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@ -1138,18 +1159,8 @@ init_remote_state (struct gdbarch *gdbarch)
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header / footer. NOTE: cagney/1999-10-26: I suspect that 8
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(``$NN:G...#NN'') is a better guess, the below has been padded a
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little. */
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if (rsa->sizeof_g_packet > ((rsa->remote_packet_size - 32) / 2))
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rsa->remote_packet_size = (rsa->sizeof_g_packet * 2 + 32);
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/* Make sure that the packet buffer is plenty big enough for
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this architecture. */
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if (rs->buf_size < rsa->remote_packet_size)
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{
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rs->buf_size = 2 * rsa->remote_packet_size;
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rs->buf = (char *) xrealloc (rs->buf, rs->buf_size);
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}
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return rsa;
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if (this->sizeof_g_packet > ((this->remote_packet_size - 32) / 2))
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this->remote_packet_size = (this->sizeof_g_packet * 2 + 32);
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}
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/* Return the current allowed size of a remote packet. This is
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@ -1159,7 +1170,7 @@ static long
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get_remote_packet_size (void)
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{
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struct remote_state *rs = get_remote_state ();
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remote_arch_state *rsa = get_remote_arch_state (target_gdbarch ());
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remote_arch_state *rsa = rs->get_remote_arch_state (target_gdbarch ());
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if (rs->explicit_packet_size)
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return rs->explicit_packet_size;
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@ -1327,7 +1338,7 @@ static long
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get_memory_packet_size (struct memory_packet_config *config)
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{
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struct remote_state *rs = get_remote_state ();
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remote_arch_state *rsa = get_remote_arch_state (target_gdbarch ());
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remote_arch_state *rsa = rs->get_remote_arch_state (target_gdbarch ());
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long what_they_get;
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if (config->fixed_p)
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@ -7249,7 +7260,7 @@ Packet: '%s'\n"),
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}
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event->arch = inf->gdbarch;
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rsa = get_remote_arch_state (event->arch);
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rsa = event->rs->get_remote_arch_state (event->arch);
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}
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packet_reg *reg
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@ -7843,7 +7854,7 @@ process_g_packet (struct regcache *regcache)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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struct remote_state *rs = get_remote_state ();
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remote_arch_state *rsa = get_remote_arch_state (gdbarch);
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remote_arch_state *rsa = rs->get_remote_arch_state (gdbarch);
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int i, buf_len;
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char *p;
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char *regs;
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@ -7977,7 +7988,8 @@ void
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remote_target::fetch_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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remote_arch_state *rsa = get_remote_arch_state (gdbarch);
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struct remote_state *rs = get_remote_state ();
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remote_arch_state *rsa = rs->get_remote_arch_state (gdbarch);
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int i;
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set_remote_traceframe ();
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@ -8027,7 +8039,8 @@ remote_target::fetch_registers (struct regcache *regcache, int regnum)
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void
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remote_target::prepare_to_store (struct regcache *regcache)
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{
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remote_arch_state *rsa = get_remote_arch_state (regcache->arch ());
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struct remote_state *rs = get_remote_state ();
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remote_arch_state *rsa = rs->get_remote_arch_state (regcache->arch ());
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int i;
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/* Make sure the entire registers array is valid. */
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@ -8093,7 +8106,7 @@ static void
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store_registers_using_G (const struct regcache *regcache)
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{
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struct remote_state *rs = get_remote_state ();
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remote_arch_state *rsa = get_remote_arch_state (regcache->arch ());
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remote_arch_state *rsa = rs->get_remote_arch_state (regcache->arch ());
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gdb_byte *regs;
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char *p;
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@ -8132,7 +8145,8 @@ void
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remote_target::store_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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remote_arch_state *rsa = get_remote_arch_state (gdbarch);
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struct remote_state *rs = get_remote_state ();
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remote_arch_state *rsa = rs->get_remote_arch_state (gdbarch);
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int i;
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set_remote_traceframe ();
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@ -12918,7 +12932,7 @@ remote_target::get_trace_status (struct trace_status *ts)
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return -1;
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trace_regblock_size
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= get_remote_arch_state (target_gdbarch ())->sizeof_g_packet;
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= rs->get_remote_arch_state (target_gdbarch ())->sizeof_g_packet;
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putpkt ("qTStatus");
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@ -14038,8 +14052,6 @@ _initialize_remote (void)
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const char *cmd_name;
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/* architecture specific data */
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remote_gdbarch_data_handle =
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gdbarch_data_register_post_init (init_remote_state);
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remote_g_packet_data_handle =
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gdbarch_data_register_pre_init (remote_g_packet_data_init);
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