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* NEWS: Mention the additional style. * breakpoint.h (struct bp_target_info): New fields tcommands, persist. (struct bp_location): New field cmd_bytecode. * breakpoint.c: Include format.h. (disconnected_dprintf): New global. (parse_cmd_to_aexpr): New function. (build_target_command_list): New function. (insert_bp_location): Call it. (remove_breakpoints_pid): Skip dprintf breakpoints. (print_one_breakpoint_location): Ditto. (dprintf_style_agent): New global. (dprintf_style_enums): Add dprintf_style_agent. (update_dprintf_command_list): Add agent case. (agent_printf_command): New function. (_initialize_breakpoint): Add new commands. * common/ax.def (printf): New bytecode. * ax.h (ax_string): Declare. * ax-gdb.h (gen_printf): Declare. * ax-gdb.c: Include cli-utils.h, format.h. (gen_printf): New function. (maint_agent_print_command): New function. (_initialize_ax_gdb): Add maint agent-printf command. * ax-general.c (ax_string): New function. (ax_print): Add printf disassembly. * Makefile.in (SFILES): Add format.c (COMMON_OBS): Add format.o. * common/format.h: New file. * common/format.c: New file. * printcmd.c: Include format.h. (ui_printf): Call parse_format_string. * remote.c (remote_state): New field breakpoint_commands. (PACKET_BreakpointCommands): New enum. (remote_breakpoint_commands_feature): New function. (remote_protocol_features): Add new BreakpointCommands entry. (remote_can_run_breakpoint_commands): New function. (remote_add_target_side_commands): New function. (remote_insert_breakpoint): Call it. (remote_insert_hw_breakpoint): Ditto. (_initialize_remote): Add new packet configuration for target-side breakpoint commands. * target.h (struct target_ops): New field to_can_run_breakpoint_commands. (target_can_run_breakpoint_commands): New macro. * target.c (update_current_target): Handle to_can_run_breakpoint_commands. [gdbserver] * Makefile.in (WARN_CFLAGS_NO_FORMAT): Define. (ax.o): Add it to build rule. (ax-ipa.o): Ditto. (OBS): Add format.o. (IPA_OBS): Add format.o. * server.c (handle_query): Claim support for breakpoint commands. (process_point_options): Add command case. (process_serial_event): Leave running if there are printfs in effect. * mem-break.h (any_persistent_commands): Declare. (add_breakpoint_commands): Declare. (gdb_no_commands_at_breakpoint): Declare. (run_breakpoint_commands): Declare. * mem-break.c (struct point_command_list): New struct. (struct breakpoint): New field command_list. (any_persistent_commands): New function. (add_commands_to_breakpoint): New function. (add_breakpoint_commands): New function. (gdb_no_commands_at_breakpoint): New function. (run_breakpoint_commands): New function. * linux-low.c (linux_wait_1): Test for and run breakpoint commands locally. * ax.c: Include format.h. (ax_printf): New function. (gdb_eval_agent_expr): Add printf opcode. [doc] * gdb.texinfo (Dynamic Printf): Mention agent style and disconnected dprintf. (Maintenance Commands): Describe maint agent-printf. (General Query Packets): Mention BreakpointCommands feature. (Packets): Document commands extension to Z0 packet. * agentexpr.texi (Bytecode Descriptions): Document printf bytecode. [testsuite] * gdb.base/dprintf.exp: Add agent style tests.
128 lines
4.8 KiB
C
128 lines
4.8 KiB
C
/* GDB-specific functions for operating on agent expressions
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Copyright (C) 1998-2000, 2007-2012 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef AX_GDB_H
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#define AX_GDB_H
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struct expression;
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/* Types and enums */
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/* GDB stores expressions in the form of a flattened tree (struct
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expression), so we just walk that tree and generate agent bytecodes
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as we go along.
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GDB's normal evaluation uses struct value, which contains the
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expression's value as well as its address or the register it came
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from. The `+' operator uses the value, whereas the unary `&'
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operator will use the address portion. The `=' operator will use
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the address or register number of its left hand side.
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The issues are different when generating agent bytecode. Given a
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variable reference expression, we should not necessarily generate
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code to fetch its value, because the next operator may be `=' or
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unary `&'. Instead, when we recurse on a subexpression, we
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indicate whether we want that expression to produce an lvalue or an
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rvalue. If we requested an lvalue, then the recursive call tells
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us whether it generated code to compute an address on the stack, or
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whether the lvalue lives in a register.
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The `axs' prefix here means `agent expression, static', because
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this is all static analysis of the expression, i.e. analysis which
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doesn't depend on the contents of memory and registers. */
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/* Different kinds of agent expression static values. */
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enum axs_lvalue_kind
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{
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/* We generated code to compute the subexpression's value.
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Constants and arithmetic operators yield this. */
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axs_rvalue,
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/* We generated code to yield the subexpression's value's address on
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the top of the stack. If the caller needs an rvalue, it should
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call require_rvalue to produce the rvalue from this address. */
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axs_lvalue_memory,
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/* We didn't generate any code, and the stack is undisturbed,
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because the subexpression's value lives in a register; u.reg is
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the register number. If the caller needs an rvalue, it should
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call require_rvalue to produce the rvalue from this register
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number. */
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axs_lvalue_register
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};
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/* Structure describing what we got from a subexpression. Think of
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this as parallel to value.h's enum lval_type, except that we're
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describing a value which will exist when the expression is
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evaluated in the future, not a value we have in our hand. */
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struct axs_value
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{
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enum axs_lvalue_kind kind; /* see above */
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/* The type of the subexpression. Even if lvalue == axs_lvalue_memory,
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this is the type of the value itself; the value on the stack is a
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"pointer to" an object of this type. */
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struct type *type;
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/* If nonzero, this is a variable which does not actually exist in
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the program. */
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char optimized_out;
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union
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{
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/* if kind == axs_lvalue_register, this is the register number */
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int reg;
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}
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u;
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};
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/* Translating GDB expressions into agent expressions. */
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/* Given a GDB expression EXPR, return bytecode to trace its value.
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The result will use the `trace' and `trace_quick' bytecodes to
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record the value of all memory touched by the expression, and leave
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no values on the stack. The caller can then use the ax_reqs
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function to discover which registers the expression uses. */
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extern struct agent_expr *gen_trace_for_expr (CORE_ADDR, struct expression *);
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extern struct agent_expr *gen_trace_for_var (CORE_ADDR, struct gdbarch *,
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struct symbol *);
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extern struct agent_expr *gen_trace_for_return_address (CORE_ADDR,
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struct gdbarch *);
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extern struct agent_expr *gen_eval_for_expr (CORE_ADDR, struct expression *);
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extern void gen_expr (struct expression *exp, union exp_element **pc,
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struct agent_expr *ax, struct axs_value *value);
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extern void require_rvalue (struct agent_expr *ax, struct axs_value *value);
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struct format_piece;
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extern struct agent_expr *gen_printf (CORE_ADDR, struct gdbarch *,
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CORE_ADDR, LONGEST, char *, int,
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struct format_piece *,
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int, struct expression **);
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extern int trace_kludge;
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extern int trace_string_kludge;
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#endif /* AX_GDB_H */
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