+/* This is called when a breakpoint is deleted. It updates the
+ inferior's cache, if needed. */
+
+static void
+jit_breakpoint_deleted (struct breakpoint *b)
+{
+ struct bp_location *iter;
+
+ if (b->type != bp_jit_event)
+ return;
+
+ for (iter = b->loc; iter != NULL; iter = iter->next)
+ {
+ struct jit_program_space_data *ps_data;
+
+ ps_data = program_space_data (iter->pspace, jit_program_space_data);
+ if (ps_data != NULL && ps_data->jit_breakpoint == iter->owner)
+ {
+ ps_data->cached_code_address = 0;
+ ps_data->jit_breakpoint = NULL;
+ }
+ }
+}
+
+/* (Re-)Initialize the jit breakpoint if necessary.
+ Return 0 on success. */
+
+static int
+jit_breakpoint_re_set_internal (struct gdbarch *gdbarch,
+ struct jit_program_space_data *ps_data)
+{
+ struct bound_minimal_symbol reg_symbol;
+ struct bound_minimal_symbol desc_symbol;
+ struct jit_objfile_data *objf_data;
+ CORE_ADDR addr;
+
+ if (ps_data->objfile == NULL)
+ {
+ /* Lookup the registration symbol. If it is missing, then we
+ assume we are not attached to a JIT. */
+ reg_symbol = lookup_minimal_symbol_and_objfile (jit_break_name);
+ if (reg_symbol.minsym == NULL
+ || BMSYMBOL_VALUE_ADDRESS (reg_symbol) == 0)
+ return 1;
+
+ desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL,
+ reg_symbol.objfile);
+ if (desc_symbol.minsym == NULL
+ || BMSYMBOL_VALUE_ADDRESS (desc_symbol) == 0)
+ return 1;
+
+ objf_data = get_jit_objfile_data (reg_symbol.objfile);
+ objf_data->register_code = reg_symbol.minsym;
+ objf_data->descriptor = desc_symbol.minsym;
+
+ ps_data->objfile = reg_symbol.objfile;
+ }
+ else
+ objf_data = get_jit_objfile_data (ps_data->objfile);
+
+ addr = MSYMBOL_VALUE_ADDRESS (ps_data->objfile, objf_data->register_code);
+
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "jit_breakpoint_re_set_internal, "
+ "breakpoint_addr = %s\n",
+ paddress (gdbarch, addr));
+
+ if (ps_data->cached_code_address == addr)
+ return 1;
+
+ /* Delete the old breakpoint. */
+ if (ps_data->jit_breakpoint != NULL)
+ delete_breakpoint (ps_data->jit_breakpoint);
+
+ /* Put a breakpoint in the registration symbol. */
+ ps_data->cached_code_address = addr;
+ ps_data->jit_breakpoint = create_jit_event_breakpoint (gdbarch, addr);
+
+ return 0;
+}
+
+/* The private data passed around in the frame unwind callback
+ functions. */
+
+struct jit_unwind_private
+{
+ /* Cached register values. See jit_frame_sniffer to see how this
+ works. */
+ struct gdb_reg_value **registers;
+
+ /* The frame being unwound. */
+ struct frame_info *this_frame;
+};
+
+/* Sets the value of a particular register in this frame. */
+
+static void
+jit_unwind_reg_set_impl (struct gdb_unwind_callbacks *cb, int dwarf_regnum,
+ struct gdb_reg_value *value)
+{
+ struct jit_unwind_private *priv;
+ int gdb_reg;
+
+ priv = cb->priv_data;
+
+ gdb_reg = gdbarch_dwarf2_reg_to_regnum (get_frame_arch (priv->this_frame),
+ dwarf_regnum);
+ if (gdb_reg == -1)
+ {
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ _("Could not recognize DWARF regnum %d"),
+ dwarf_regnum);
+ return;
+ }
+
+ gdb_assert (priv->registers);
+ priv->registers[gdb_reg] = value;
+}
+
+static void
+reg_value_free_impl (struct gdb_reg_value *value)
+{
+ xfree (value);
+}
+
+/* Get the value of register REGNUM in the previous frame. */
+
+static struct gdb_reg_value *
+jit_unwind_reg_get_impl (struct gdb_unwind_callbacks *cb, int regnum)
+{
+ struct jit_unwind_private *priv;
+ struct gdb_reg_value *value;
+ int gdb_reg, size;
+ struct gdbarch *frame_arch;
+
+ priv = cb->priv_data;
+ frame_arch = get_frame_arch (priv->this_frame);
+
+ gdb_reg = gdbarch_dwarf2_reg_to_regnum (frame_arch, regnum);
+ size = register_size (frame_arch, gdb_reg);
+ value = xmalloc (sizeof (struct gdb_reg_value) + size - 1);
+ value->defined = deprecated_frame_register_read (priv->this_frame, gdb_reg,
+ value->value);
+ value->size = size;
+ value->free = reg_value_free_impl;
+ return value;
+}
+
+/* gdb_reg_value has a free function, which must be called on each
+ saved register value. */
+
+static void
+jit_dealloc_cache (struct frame_info *this_frame, void *cache)
+{
+ struct jit_unwind_private *priv_data = cache;
+ struct gdbarch *frame_arch;
+ int i;
+
+ gdb_assert (priv_data->registers);
+ frame_arch = get_frame_arch (priv_data->this_frame);
+
+ for (i = 0; i < gdbarch_num_regs (frame_arch); i++)
+ if (priv_data->registers[i] && priv_data->registers[i]->free)
+ priv_data->registers[i]->free (priv_data->registers[i]);
+
+ xfree (priv_data->registers);
+ xfree (priv_data);
+}
+
+/* The frame sniffer for the pseudo unwinder.
+
+ While this is nominally a frame sniffer, in the case where the JIT
+ reader actually recognizes the frame, it does a lot more work -- it
+ unwinds the frame and saves the corresponding register values in
+ the cache. jit_frame_prev_register simply returns the saved
+ register values. */
+
+static int
+jit_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame, void **cache)
+{
+ struct jit_unwind_private *priv_data;
+ struct gdb_unwind_callbacks callbacks;
+ struct gdb_reader_funcs *funcs;
+
+ callbacks.reg_get = jit_unwind_reg_get_impl;
+ callbacks.reg_set = jit_unwind_reg_set_impl;
+ callbacks.target_read = jit_target_read_impl;
+
+ if (loaded_jit_reader == NULL)
+ return 0;
+
+ funcs = loaded_jit_reader->functions;
+
+ gdb_assert (!*cache);
+
+ *cache = XCNEW (struct jit_unwind_private);
+ priv_data = *cache;
+ priv_data->registers =
+ XCNEWVEC (struct gdb_reg_value *,
+ gdbarch_num_regs (get_frame_arch (this_frame)));
+ priv_data->this_frame = this_frame;
+
+ callbacks.priv_data = priv_data;
+
+ /* Try to coax the provided unwinder to unwind the stack */
+ if (funcs->unwind (funcs, &callbacks) == GDB_SUCCESS)
+ {
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog, _("Successfully unwound frame using "
+ "JIT reader.\n"));
+ return 1;
+ }
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog, _("Could not unwind frame using "
+ "JIT reader.\n"));
+
+ jit_dealloc_cache (this_frame, *cache);
+ *cache = NULL;
+
+ return 0;
+}
+
+
+/* The frame_id function for the pseudo unwinder. Relays the call to
+ the loaded plugin. */
+
+static void
+jit_frame_this_id (struct frame_info *this_frame, void **cache,
+ struct frame_id *this_id)
+{
+ struct jit_unwind_private private;
+ struct gdb_frame_id frame_id;
+ struct gdb_reader_funcs *funcs;
+ struct gdb_unwind_callbacks callbacks;
+
+ private.registers = NULL;
+ private.this_frame = this_frame;
+
+ /* We don't expect the frame_id function to set any registers, so we
+ set reg_set to NULL. */
+ callbacks.reg_get = jit_unwind_reg_get_impl;
+ callbacks.reg_set = NULL;
+ callbacks.target_read = jit_target_read_impl;
+ callbacks.priv_data = &private;
+
+ gdb_assert (loaded_jit_reader);
+ funcs = loaded_jit_reader->functions;
+
+ frame_id = funcs->get_frame_id (funcs, &callbacks);
+ *this_id = frame_id_build (frame_id.stack_address, frame_id.code_address);
+}
+
+/* Pseudo unwinder function. Reads the previously fetched value for
+ the register from the cache. */
+
+static struct value *
+jit_frame_prev_register (struct frame_info *this_frame, void **cache, int reg)
+{
+ struct jit_unwind_private *priv = *cache;
+ struct gdb_reg_value *value;
+
+ if (priv == NULL)
+ return frame_unwind_got_optimized (this_frame, reg);
+
+ gdb_assert (priv->registers);
+ value = priv->registers[reg];
+ if (value && value->defined)
+ return frame_unwind_got_bytes (this_frame, reg, value->value);
+ else
+ return frame_unwind_got_optimized (this_frame, reg);
+}
+
+/* Relay everything back to the unwinder registered by the JIT debug
+ info reader.*/
+
+static const struct frame_unwind jit_frame_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ jit_frame_this_id,
+ jit_frame_prev_register,
+ NULL,
+ jit_frame_sniffer,
+ jit_dealloc_cache
+};
+
+
+/* This is the information that is stored at jit_gdbarch_data for each
+ architecture. */
+
+struct jit_gdbarch_data_type
+{
+ /* Has the (pseudo) unwinder been prepended? */
+ int unwinder_registered;
+};
+
+/* Check GDBARCH and prepend the pseudo JIT unwinder if needed. */
+
+static void
+jit_prepend_unwinder (struct gdbarch *gdbarch)
+{
+ struct jit_gdbarch_data_type *data;
+
+ data = gdbarch_data (gdbarch, jit_gdbarch_data);
+ if (!data->unwinder_registered)
+ {
+ frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind);
+ data->unwinder_registered = 1;
+ }
+}
+
+/* Register any already created translations. */