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mercury/ssdb/ssdb.m
Julien Fischer 40575f7cce Update more copyright notices. 
browser/*.m:
grade_lib/*.m:
mdbcomp/*.m:
profiler/*.m:
ssdb/*.m:
     As above.
2024-12-29 20:53:29 +11:00

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%---------------------------------------------------------------------------%
% vim: ft=mercury ts=4 sw=4 et
%---------------------------------------------------------------------------%
% Copyright (C) 2007, 2010-2011 The University of Melbourne.
% Copyright (C) 2015-2019, 2021-2024 The Mercury team.
% This file is distributed under the terms specified in COPYING.LIB.
%---------------------------------------------------------------------------%
%
% File: ssdb.m.
% Authors: oannet, wangp.
%
% This module is automatically imported into every module that is compiled
% using --source-to-source-debug.
%
% It provides the primitives which are needed by this source-to-source
% transformation to allow debugging.
%
%----------------------------------------------------------------------------%
%----------------------------------------------------------------------------%
:- module ssdb.
:- interface.
:- import_module io.
:- import_module list.
%-----------------------------------------------------------------------------%
:- type ssdb_proc_id
---> ssdb_proc_id(
module_name :: string,
proc_name :: string
).
:- type ssdb_event_type
---> ssdb_call
; ssdb_exit
; ssdb_fail
; ssdb_call_nondet
; ssdb_exit_nondet
; ssdb_redo_nondet
; ssdb_fail_nondet
; ssdb_excp.
:- type ssdb_tracing_level
---> deep
; shallow
.
% Type to determine if it is necessary to do a retry.
%
:- type ssdb_retry
---> do_retry
; do_not_retry.
% The list of all variables in use in a procedure.
%
:- type list_var_value == list(var_value).
% Record the instantiatedness and value of each variable used in a
% procedure.
%
:- type var_value
---> unbound_head_var(var_name, pos)
; some [T] bound_head_var(var_name, pos, T)
; some [T] bound_other_var(var_name, T).
% Variable name.
%
:- type var_name == string.
% The argument position of the head variable.
% Positions are numbered from 0.
%
:- type pos == int.
% Update globals recording the context of the upcoming call.
%
:- impure pred set_context(string::in, int::in) is det.
% This routine is called at each call event that occurs.
%
:- impure pred handle_event_call(ssdb_proc_id::in,
list_var_value::in, ssdb_tracing_level::in) is det.
% This routine is called at each call event in a nondet procedure.
%
:- impure pred handle_event_call_nondet(ssdb_proc_id::in,
list_var_value::in, ssdb_tracing_level::in) is det.
% This routine is called at each exit event that occurs.
%
:- impure pred handle_event_exit(ssdb_proc_id::in, list_var_value::in,
ssdb_retry::out) is det.
% This routine is called at each exit event in a nondet procedure.
%
:- impure pred handle_event_exit_nondet(ssdb_proc_id::in,
list_var_value::in) is det.
% This routine is called at each fail event that occurs.
%
:- impure pred handle_event_fail(ssdb_proc_id::in, list_var_value::in,
ssdb_retry::out) is det.
% This routine is called at each fail event in a nondet procedure.
%
:- impure pred handle_event_fail_nondet(ssdb_proc_id::in, list_var_value::in,
ssdb_retry::out) is det.
% This routine is called at each redo event in a nondet procedure.
%
:- impure pred handle_event_redo_nondet(ssdb_proc_id::in,
list_var_value::in) is det.
%-----------------------------------------------------------------------------%
% Values of this type record whether ssdb debugging was enabled or not
% before a call to pause_debugging, so that resume_debugging can restore
% the condition before the pause.
%
:- type debugging_paused.
% These low-level predicates allow you to suspend the debugger temporarily.
%
% Debugging of multi-threaded programs is unsupported, but it is possible
% to debug the initial thread only, if you pause debugging while spawning
% a thread:
%
% ssdb.pause_debugging(Paused, !IO),
% thread.spawn(some_thread_proc, !IO),
% ssdb.resume_debugging(Paused, !IO)
%
% The spawned thread will simply execute as if debugging was disabled.
% It will continue running in the background during debugger prompts.
%
:- pred pause_debugging(debugging_paused::out, io::di, io::uo) is det.
:- pred resume_debugging(debugging_paused::in, io::di, io::uo) is det.
% Enable the debugger in the calling thread. You may want to start the
% program with debugging initialised but disabled by default, by setting
% the environment variable SSDB=0.
%
:- pred enable_debugging(io::di, io::uo) is det.
%----------------------------------------------------------------------------%
%----------------------------------------------------------------------------%
:- implementation.
:- import_module assoc_list.
:- import_module bitmap.
:- import_module bool.
:- import_module char.
:- import_module dir.
:- import_module int.
:- import_module io.environment.
:- import_module io.file.
:- import_module map.
:- import_module maybe.
:- import_module pair.
:- import_module require.
:- import_module string.
:- import_module univ.
:- import_module mdb.
:- import_module mdb.browse.
:- import_module mdb.browser_info.
:- import_module mdb.browser_term.
:- import_module mdb.listing.
:- import_module mdb.print_term.
:- pragma foreign_decl("C",
"
#include ""mercury_signal.h""
static void MR_ssdb_sigint_handler(void);
").
%-----------------------------------------------------------------------------%
% Note: debugger_off must be first because io.init_state/2 is called
% before the `do_nothing' mutable is initialised. At that time `do_nothing'
% will have a value of zero. By putting debugger_off first, it will
% be represented by zero so the SSDB port code will correctly do nothing
% until after the library is initialised.
%
% XXX The state of the debugger should include not just this enabled vs
% disabled flag, but also the input and output streams to use.
% This type should therefore be called something else. However, the current
% code of the Java foreign_proc for get_debugger_state_safer below
% depends on this name.
%
:- type debugger_state
---> debugger_off
; debugger_on.
:- type debugging_paused
---> debugging_paused(debugger_state).
:- type stack_frame
---> stack_frame(
% Event Number
sf_event_number :: int,
% Call Sequence Number.
sf_csn :: int,
% Depth of the procedure.
sf_depth :: int,
% The goal's module name and procedure name.
sf_proc_id :: ssdb_proc_id,
% The call site.
sf_call_site_file :: string,
sf_call_site_line :: int,
% The list of the procedure's arguments.
sf_list_var_value :: list(var_value),
% The tracing level of the current call
sf_tracing_level :: ssdb_tracing_level
).
:- type list_params
---> list_params(
list_path :: listing.search_path,
list_context_lines :: int
).
%----------------------------------------------------------------------------%
% Type used by the read_and_execute_cmd predicate to configure
% the next step in the handle_event predicate.
%
:- type what_next
---> wn_step
; wn_next
; wn_continue
; wn_finish(int)
; wn_return
; wn_exception
; wn_retry(int)
; wn_retry_nondet(int)
; wn_goto(int).
% Type used by the handle_event predicate to determine the next stop of
% the read_and_execute_cmd predicate.
%
:- type next_stop
---> ns_step
% Stop at next step.
; ns_next(int)
% Stop at next event of the number between brackets.
; ns_continue
% Continue until next breakpoint.
; ns_final_port(int, ssdb_retry)
% Stop at the final port (exit or fail) of the given CSN.
% The second argument says whether to automatically retry
% upon reaching that port.
; ns_final_port_nondet(int, ssdb_retry)
% As above for nondet procedures.
% Stop at the final port (fail) of the given CSN.
; ns_nonexit
% Stop at any non-exit port.
; ns_goto(int)
% Stop at the given event number.
; ns_exception.
% Stop at the next exception.
:- type breakpoints_map == map(ssdb_proc_id, breakpoint).
:- type breakpoint
---> breakpoint(
bp_number :: int,
bp_proc_id :: ssdb_proc_id,
bp_state :: bp_state
).
:- type bp_state
---> bp_state_enabled
; bp_state_disabled.
:- inst either_call for ssdb_event_type/0
---> ssdb_call
; ssdb_call_nondet.
:- inst either_fail for ssdb_event_type/0
---> ssdb_fail
; ssdb_fail_nondet.
%----------------------------------------------------------------------------%
:- mutable(cur_filename, string, "", ground,
[untrailed, attach_to_io_state]).
:- mutable(cur_line_number, int, 0, ground,
[untrailed, attach_to_io_state]).
:- mutable(cur_ssdb_event_number, int, 0, ground,
[untrailed, attach_to_io_state]).
:- mutable(cur_ssdb_csn, int, 0, ground,
[untrailed, attach_to_io_state]).
:- mutable(cur_ssdb_next_stop, next_stop, ns_step, ground,
[untrailed, attach_to_io_state]).
:- mutable(shadow_stack, list(stack_frame), [], ground,
[untrailed, attach_to_io_state]).
:- mutable(shadow_stack_depth, int, 0, ground,
[untrailed, attach_to_io_state]).
:- mutable(nondet_shadow_stack, list(stack_frame), [], ground,
[untrailed, attach_to_io_state]).
:- mutable(nondet_shadow_stack_depth, int, 0, ground,
[untrailed, attach_to_io_state]).
:- mutable(command_queue, list(string), init_command_queue, ground,
[untrailed, attach_to_io_state]).
:- mutable(aliases, map(string, list(string)), map.init, ground,
[untrailed, attach_to_io_state]).
:- mutable(breakpoints_map, breakpoints_map, map.init, ground,
[untrailed, attach_to_io_state]).
:- mutable(breakpoints_filter, bitmap, new_breakpoints_filter, ground,
[untrailed, attach_to_io_state]).
%-----------------------------------------------------------------------------%
:- mutable(browser_state, browser_persistent_state,
init_browser_persistent_state, ground,
[untrailed, attach_to_io_state]).
:- func init_browser_persistent_state = browser_persistent_state.
init_browser_persistent_state = State :-
browser_info.init_persistent_state(State).
:- mutable(list_params, list_params, init_list_params, ground,
[untrailed, attach_to_io_state]).
:- func init_list_params = list_params.
init_list_params = list_params(new_list_path, 2).
%-----------------------------------------------------------------------------%
% zs: someone who knows more than me about how this module operates
% should change how this module handles I/O streams. Instead of saving,
% updating and restoring the current *implicit* input and output streams,
% this module should pass around streams *explicitly*. When that is done,
% we can stop specifying --no-warn-implicit-stream-calls for this module.
:- mutable(tty_in, io.text_input_stream, io.stdin_stream,
ground, [untrailed, attach_to_io_state]).
:- mutable(tty_out, io.text_output_stream, io.stdout_stream,
ground, [untrailed, attach_to_io_state]).
:- mutable(saved_input_stream, io.text_input_stream, io.stdin_stream,
ground, [untrailed, attach_to_io_state]).
:- mutable(saved_output_stream, io.text_output_stream, io.stdout_stream,
ground, [untrailed, attach_to_io_state]).
% This is thread-local to allow debugging of the initial thread in
% multi-threaded programs. As thread-local mutables inherit their values
% from the parent thread, the user must temporarily disable debugging while
% the child thread is created, using `pause_debugging'.
%
:- mutable(debugger_state, debugger_state, debugger_off,
ground, [untrailed, thread_local, attach_to_io_state]).
:- initialise(init_debugger_state/2).
:- pred init_debugger_state(io::di, io::uo) is det.
init_debugger_state(!IO) :-
io.environment.get_environment_var("SSDB", MaybeEnv, !IO),
io.environment.get_environment_var("SSDB_TTY", MaybeTTY, !IO),
( if
( MaybeEnv = yes(_)
; MaybeTTY = yes(_)
)
then
(
MaybeTTY = yes(FileName),
io.open_input(FileName, InputRes, !IO),
(
InputRes = ok(InputStream),
set_tty_in(InputStream, !IO)
;
InputRes = error(_)
),
io.open_output(FileName, OutputRes, !IO),
(
OutputRes = ok(OutputStream),
set_tty_out(OutputStream, !IO)
;
OutputRes = error(_)
)
;
MaybeTTY = no
),
install_sigint_handler(!IO),
install_exception_hooks(!IO),
add_source_commands(!IO),
( if MaybeEnv = yes("0") then
% Sometimes it is necessary to start the program with debugging
% disabled, then enable it later from within the program.
set_debugger_state(debugger_off, !IO)
else
set_debugger_state(debugger_on, !IO)
)
else
set_debugger_state(debugger_off, !IO)
).
:- pred add_source_commands(io::di, io::uo) is det.
add_source_commands(!IO) :-
io.environment.get_environment_var("HOME", MaybeHome, !IO),
(
MaybeHome = yes(Home),
maybe_add_source_commands(Home / ".ssdbrc", !IO)
;
MaybeHome = no
),
maybe_add_source_commands(".ssdbrc", !IO).
:- pred maybe_add_source_commands(string::in, io::di, io::uo) is det.
maybe_add_source_commands(FileName, !IO) :-
io.file.check_file_accessibility(FileName, [read], Res, !IO),
(
Res = ok,
Command = "source " ++ FileName,
get_command_queue(Queue, !IO),
set_command_queue(Queue ++ [Command], !IO)
;
Res = error(_)
).
% Cope with non-standard ways of entering Mercury code in Java grades.
%
:- pred get_debugger_state_safer(debugger_state::out, io::di, io::uo)
is det.
get_debugger_state_safer(DebuggerState, !IO) :-
% XXX The absence of this call in Java grades (due to the foreign_proc
% below) is what requires --no-warn-dead-preds to be specified for this
% module.
get_debugger_state(DebuggerState, !IO).
:- pragma foreign_proc("Java",
get_debugger_state_safer(DebuggerState::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io],
"
// If init_debugger_state was called in a thread that is not a parent of
// the current thread, the current thread would inherit a value of null
// in thread-local mutable debugger_state.
java.lang.Object X = ssdb__mutable_variable_debugger_state.get();
if (X == null) {
DebuggerState = ssdb.DEBUGGER_OFF;
ssdb__mutable_variable_debugger_state.set(DebuggerState);
} else {
DebuggerState = (ssdb.Debugger_state_0) X;
}
").
:- pragma foreign_export_enum("Java", debugger_state/0, [],
[debugger_off - "DEBUGGER_OFF"]).
%-----------------------------------------------------------------------------%
:- pragma foreign_code("C",
"
static void MR_ssdb_sigint_handler(void)
{
SSDB_step_next_stop();
}
").
:- pragma foreign_code("C#",
"
static void sigint_handler(object sender, System.ConsoleCancelEventArgs args)
{
SSDB_step_next_stop();
// Don't terminate the process.
args.Cancel = true;
}
").
:- pragma foreign_code("Java",
"
public static class SigIntHandler implements sun.misc.SignalHandler {
// XXX Using the @Override annotation here causes compilation errors
// with Java 1.5.
// @Override
public void handle(sun.misc.Signal sig) {
SSDB_step_next_stop();
}
}
").
:- pred install_sigint_handler(io::di, io::uo) is det.
:- pragma foreign_proc("C",
install_sigint_handler(_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
MR_setup_signal(SIGINT, (MR_Code *) MR_ssdb_sigint_handler,
MR_FALSE, ""ssdb: cannot install SIGINT signal handler"");
").
:- pragma foreign_proc("C#",
install_sigint_handler(_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
// Don't abort if we can't install the sigint handler.
try {
System.Console.TreatControlCAsInput = false;
}
catch (System.Exception) {}
try {
System.Console.CancelKeyPress += new System.ConsoleCancelEventHandler(
ssdb.sigint_handler
);
}
catch (System.Exception) {}
").
:- pragma foreign_proc("Java",
install_sigint_handler(IO0::di, IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
// This is an undocumented, unsupported and non-portable interface in the
// Sun JVM but it seems there is no alternative.
sun.misc.Signal.handle(new sun.misc.Signal(""INT""), new SigIntHandler());
IO = IO0;
").
install_sigint_handler(!IO).
:- pred step_next_stop(io::di, io::uo) is det.
:- pragma foreign_export("C", step_next_stop(di, uo),
"SSDB_step_next_stop").
:- pragma foreign_export("C#", step_next_stop(di, uo),
"SSDB_step_next_stop").
:- pragma foreign_export("Java", step_next_stop(di, uo),
"SSDB_step_next_stop").
step_next_stop(!IO) :-
set_cur_ssdb_next_stop(ns_step, !IO).
%-----------------------------------------------------------------------------%
set_context(FileName, Line) :-
impure set_cur_filename(FileName),
impure set_cur_line_number(Line).
%----------------------------------------------------------------------------%
handle_event_call(ProcId, ListVarValue, Level) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
handle_event_call_2(ssdb_call, ProcId, ListVarValue, Level, !IO)
;
DebuggerState = debugger_off
),
impure consume_io(!.IO)
).
handle_event_call_nondet(ProcId, ListVarValue, Level) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
handle_event_call_2(ssdb_call_nondet,
ProcId, ListVarValue, Level, !IO)
;
DebuggerState = debugger_off
),
impure consume_io(!.IO)
).
:- pred handle_event_call_2(ssdb_event_type::in(either_call), ssdb_proc_id::in,
list(var_value)::in, ssdb_tracing_level::in, io::di, io::uo) is det.
:- pragma inline(pred(handle_event_call_2/6)).
handle_event_call_2(Event, ProcId, ListVarValue, Level, !IO) :-
get_ssdb_event_number_inc(EventNum, !IO),
get_ssdb_csn_inc(CSN, !IO),
stack_depth(OldDepth, !IO),
Depth = OldDepth + 1,
% Push the new stack frame on top of the shadow stack(s).
get_cur_filename(SiteFile, !IO),
get_cur_line_number(SiteLine, !IO),
StackFrame = stack_frame(EventNum, CSN, Depth, ProcId, SiteFile, SiteLine,
ListVarValue, Level),
stack_push(StackFrame, !IO),
(
Event = ssdb_call
;
Event = ssdb_call_nondet,
nondet_stack_push(StackFrame, !IO)
),
should_stop_at_this_event(Event, EventNum, CSN, ProcId, Stop, _AutoRetry,
!IO),
(
Stop = yes,
save_streams(!IO),
print_event_info(Event, EventNum, !IO),
read_and_execute_cmd(Event, 0, WhatNext, !IO),
update_next_stop(EventNum, CSN, WhatNext, _Retry, !IO),
restore_streams(!IO)
;
Stop = no
).
%-----------------------------------------------------------------------------%
handle_event_exit(ProcId, ListVarValue, Retry) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
handle_event_exit_2(ssdb_exit, ProcId, ListVarValue, Retry, !IO)
;
DebuggerState = debugger_off,
Retry = do_not_retry
),
impure consume_io(!.IO)
).
handle_event_exit_nondet(ProcId, ListVarValue) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
handle_event_exit_2(ssdb_exit_nondet, ProcId, ListVarValue,
_Retry, !IO)
;
DebuggerState = debugger_off
),
impure consume_io(!.IO)
).
:- pred handle_event_exit_2(ssdb_event_type::in, ssdb_proc_id::in,
list(var_value)::in, ssdb_retry::out, io::di, io::uo) is det.
:- pragma inline(pred(handle_event_exit_2/6)).
handle_event_exit_2(Event, ProcId, ListVarValue, Retry, !IO) :-
get_ssdb_event_number_inc(EventNum, !IO),
stack_top_csn(CSN, !IO),
should_stop_at_this_event(Event, EventNum, CSN, ProcId, Stop, AutoRetry,
!IO),
(
Stop = yes,
(
AutoRetry = do_retry,
WhatNext = wn_retry(CSN)
;
AutoRetry = do_not_retry,
% There is no need to update the variable list on the top stack
% frame unless we are stopping to look at it.
update_top_var_list(ListVarValue, !IO),
save_streams(!IO),
print_event_info(Event, EventNum, !IO),
read_and_execute_cmd(Event, 0, WhatNext, !IO),
restore_streams(!IO)
),
update_next_stop(EventNum, CSN, WhatNext, Retry, !IO)
;
Stop = no,
Retry = do_not_retry
),
stack_pop(!IO).
%-----------------------------------------------------------------------------%
handle_event_fail(ProcId, _ListVarValue, Retry) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
handle_event_fail_2(ssdb_fail, ProcId, Retry, !IO)
;
DebuggerState = debugger_off,
Retry = do_not_retry
),
impure consume_io(!.IO)
).
handle_event_fail_nondet(ProcId, _ListVarValue, Retry) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
handle_event_fail_2(ssdb_fail_nondet, ProcId, Retry, !IO)
;
DebuggerState = debugger_off,
Retry = do_not_retry
),
impure consume_io(!.IO)
).
:- pred handle_event_fail_2(ssdb_event_type::in(either_fail), ssdb_proc_id::in,
ssdb_retry::out, io::di, io::uo) is det.
:- pragma inline(pred(handle_event_fail_2/5)).
handle_event_fail_2(Event, ProcId, Retry, !IO) :-
get_ssdb_event_number_inc(EventNum, !IO),
stack_top_csn(CSN, !IO),
should_stop_at_this_event(Event, EventNum, CSN, ProcId, Stop, AutoRetry,
!IO),
(
Stop = yes,
(
AutoRetry = do_retry,
WhatNext = wn_retry(CSN)
;
AutoRetry = do_not_retry,
save_streams(!IO),
print_event_info(Event, EventNum, !IO),
read_and_execute_cmd(Event, 0, WhatNext, !IO),
restore_streams(!IO)
),
update_next_stop(EventNum, CSN, WhatNext, Retry, !IO)
;
Stop = no,
Retry = do_not_retry
),
stack_pop(!IO),
(
Event = ssdb_fail
;
Event = ssdb_fail_nondet,
nondet_stack_pop(!IO)
).
handle_event_redo_nondet(ProcId, _ListVarValue) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
Event = ssdb_redo_nondet,
get_ssdb_event_number_inc(EventNum, !IO),
stack_depth(OldDepth, !IO),
Depth = OldDepth + 1,
lookup_nondet_stack_frame(ProcId, Depth, StackFrame, !IO),
stack_push(StackFrame, !IO),
CSN = StackFrame ^ sf_csn,
should_stop_at_this_event(Event, EventNum, CSN, ProcId, Stop,
_AutoRetry, !IO),
(
Stop = yes,
save_streams(!IO),
print_event_info(Event, EventNum, !IO),
read_and_execute_cmd(Event, 0, WhatNext, !IO),
update_next_stop(EventNum, CSN, WhatNext, _Retry, !IO),
restore_streams(!IO)
;
Stop = no
)
;
DebuggerState = debugger_off
),
impure consume_io(!.IO)
).
:- pred lookup_nondet_stack_frame(ssdb_proc_id::in, int::in, stack_frame::out,
io::di, io::uo) is det.
lookup_nondet_stack_frame(ProcId, Depth, StackFrame, !IO) :-
search_nondet_stack_frame(ProcId, Depth, MaybeStackFrame, !IO),
(
MaybeStackFrame = yes(StackFrame)
;
MaybeStackFrame = no,
error("ssdb: lookup_nondet_stack_frame")
).
:- pred search_nondet_stack_frame(ssdb_proc_id::in, int::in,
maybe(stack_frame)::out, io::di, io::uo) is det.
search_nondet_stack_frame(ProcId, Depth, StackFrame, !IO) :-
nondet_stack_depth(StackDepth, !IO),
search_nondet_stack_frame_2(ProcId, Depth, 0, StackDepth, StackFrame, !IO).
:- pred search_nondet_stack_frame_2(ssdb_proc_id::in, int::in, int::in,
int::in, maybe(stack_frame)::out, io::di, io::uo) is det.
search_nondet_stack_frame_2(ProcId, Depth, N, StackDepth, MaybeStackFrame,
!IO) :-
( if N >= StackDepth then
MaybeStackFrame = no
else
nondet_stack_index(N, Frame, !IO),
( if
Frame ^ sf_proc_id ^ module_name = ProcId ^ module_name,
Frame ^ sf_proc_id ^ proc_name = ProcId ^ proc_name,
Frame ^ sf_depth = Depth
then
MaybeStackFrame = yes(Frame)
else
search_nondet_stack_frame_2(ProcId, Depth, N + 1, StackDepth,
MaybeStackFrame, !IO)
)
).
%----------------------------------------------------------------------------%
%
% Support for exception events (Java only currently).
%
:- pragma foreign_code("C#", "
private class SsdbHooks : exception.SsdbHooks {
public override void on_throw_impl(univ.Univ_0 univ) {
ssdb.SSDB_handle_event_excp(""exception"", ""throw_impl"", univ);
}
public override int on_catch_impl() {
return ssdb.SSDB_get_cur_ssdb_csn();
}
public override void on_catch_impl_exception(int CSN) {
ssdb.SSDB_rollback_stack(CSN);
ssdb.SSDB_rollback_nondet_stack(CSN);
}
}
").
:- pragma foreign_code("Java", "
private static class SsdbHooks extends exception.SsdbHooks {
@Override
public void on_throw_impl(univ.Univ_0 univ) {
ssdb.SSDB_handle_event_excp(""exception"", ""throw_impl"", univ);
}
@Override
public int on_catch_impl() {
return ssdb.SSDB_get_cur_ssdb_csn();
}
@Override
public void on_catch_impl_exception(int CSN) {
ssdb.SSDB_rollback_stack(CSN);
ssdb.SSDB_rollback_nondet_stack(CSN);
}
}
").
:- pred install_exception_hooks(io::di, io::uo) is det.
install_exception_hooks(!IO).
:- pragma foreign_proc("C#",
install_exception_hooks(_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
exception.ssdb_hooks = new ssdb.SsdbHooks();
").
:- pragma foreign_proc("Java",
install_exception_hooks(_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
exception.ssdb_hooks = new ssdb.SsdbHooks();
").
:- impure pred handle_event_excp(string::in, string::in, univ::in) is det.
:- pragma foreign_export("C#", handle_event_excp(in, in, in),
"SSDB_handle_event_excp").
:- pragma foreign_export("Java", handle_event_excp(in, in, in),
"SSDB_handle_event_excp").
handle_event_excp(ModuleName, ProcName, Univ) :-
some [!IO] (
impure invent_io(!:IO),
get_debugger_state_safer(DebuggerState, !IO),
(
DebuggerState = debugger_on,
ProcId = ssdb_proc_id(ModuleName, ProcName),
VarDescs = ['new bound_head_var'("Univ", 1, Univ)],
% XXX maybe we need to have a exception level
handle_event_excp_2(ProcId, VarDescs, deep, !IO)
;
DebuggerState = debugger_off
),
impure consume_io(!.IO)
).
:- pred handle_event_excp_2(ssdb_proc_id::in, list(var_value)::in,
ssdb_tracing_level::in,
io::di, io::uo) is det.
handle_event_excp_2(ProcId, ListVarValue, Level, !IO) :-
get_ssdb_event_number_inc(EventNum, !IO),
get_ssdb_csn_inc(CSN, !IO),
stack_depth(OldDepth, !IO),
Depth = OldDepth + 1,
% Push the new stack frame on top of the shadow stack(s).
get_cur_filename(SiteFile, !IO),
get_cur_line_number(SiteLine, !IO),
StackFrame = stack_frame(EventNum, CSN, Depth, ProcId, SiteFile, SiteLine,
ListVarValue, Level),
stack_push(StackFrame, !IO),
Event = ssdb_excp,
should_stop_at_this_event(Event, EventNum, CSN, ProcId, Stop, _AutoRetry,
!IO),
(
Stop = yes,
save_streams(!IO),
print_event_info(Event, EventNum, !IO),
read_and_execute_cmd(Event, 0, WhatNext, !IO),
update_next_stop(EventNum, CSN, WhatNext, _Retry, !IO),
restore_streams(!IO)
;
Stop = no
).
%----------------------------------------------------------------------------%
:- pragma foreign_export("C#", get_cur_ssdb_csn(out),
"SSDB_get_cur_ssdb_csn").
:- pragma foreign_export("Java", get_cur_ssdb_csn(out),
"SSDB_get_cur_ssdb_csn").
% Increment the CSN and return the new value.
%
:- pred get_ssdb_csn_inc(int::out, io::di, io::uo) is det.
get_ssdb_csn_inc(CSN, !IO) :-
get_cur_ssdb_csn(CSN0, !IO),
CSN = CSN0 + 1,
set_cur_ssdb_csn(CSN, !IO).
% Increment the Event Number and return the new value.
%
:- pred get_ssdb_event_number_inc(int::out, io::di, io::uo) is det.
get_ssdb_event_number_inc(EventNum, !IO) :-
get_cur_ssdb_event_number(EventNum0, !IO),
EventNum = EventNum0 + 1,
set_cur_ssdb_event_number(EventNum, !IO).
%-----------------------------------------------------------------------------%
:- pred stack_top(stack_frame::out, io::di, io::uo) is det.
stack_top(Frame, !IO) :-
get_shadow_stack(Stack, !IO),
(
Stack = [],
error("ssdb: stack_top on empty stack")
;
Stack = [Frame | _]
).
:- pred stack_top_csn(int::out, io::di, io::uo) is det.
stack_top_csn(CSN, !IO) :-
stack_top(Frame, !IO),
CSN = Frame ^ sf_csn.
:- pred stack_index(int::in, stack_frame::out, io::di, io::uo) is det.
stack_index(Num, Frame, !IO) :-
get_shadow_stack(Stack, !IO),
list.det_index0(Stack, Num, Frame).
:- pred stack_depth(int::out, io::di, io::uo) is det.
stack_depth(Depth, !IO) :-
get_shadow_stack_depth(Depth, !IO).
:- pred stack_push(stack_frame::in, io::di, io::uo) is det.
stack_push(Frame, !IO) :-
get_shadow_stack(Stack, !IO),
set_shadow_stack([Frame | Stack], !IO),
get_shadow_stack_depth(Depth, !IO),
set_shadow_stack_depth(Depth + 1, !IO).
:- pred stack_pop(io::di, io::uo) is det.
stack_pop(!IO) :-
get_shadow_stack(Stack, !IO),
get_shadow_stack_depth(Depth, !IO),
(
Stack = [],
error("ssdb: stack_pop on empty stack")
;
Stack = [_ | StackTail],
set_shadow_stack(StackTail, !IO),
set_shadow_stack_depth(Depth - 1, !IO)
).
% Update the sf_list_var_value field of the top shadow stack element.
%
:- pred update_top_var_list(list(var_value)::in, io::di, io::uo) is det.
update_top_var_list(ListVarValue, !IO) :-
get_shadow_stack(Stack0, !IO),
(
Stack0 = [],
error("ssdb: update_top_var_list on empty stack")
;
Stack0 = [Frame0 | Frames],
Frame = Frame0 ^ sf_list_var_value := ListVarValue,
set_shadow_stack([Frame | Frames], !IO)
).
:- pred nondet_stack_index(int::in, stack_frame::out,
io::di, io::uo) is det.
nondet_stack_index(Num, Frame, !IO) :-
get_nondet_shadow_stack(Stack, !IO),
list.det_index0(Stack, Num, Frame).
:- pred nondet_stack_depth(int::out, io::di, io::uo) is det.
nondet_stack_depth(Depth, !IO) :-
get_nondet_shadow_stack_depth(Depth, !IO).
:- pred nondet_stack_push(stack_frame::in, io::di, io::uo)
is det.
nondet_stack_push(Frame, !IO) :-
get_nondet_shadow_stack(Stack, !IO),
set_nondet_shadow_stack([Frame | Stack], !IO),
get_nondet_shadow_stack_depth(Depth, !IO),
set_nondet_shadow_stack_depth(Depth + 1, !IO).
:- pred nondet_stack_pop(io::di, io::uo) is det.
nondet_stack_pop(!IO) :-
get_nondet_shadow_stack(Stack, !IO),
get_nondet_shadow_stack_depth(Depth, !IO),
(
Stack = [],
error("ssdb: nondet_stack_pop on empty stack")
;
Stack = [_ | StackTail],
set_nondet_shadow_stack(StackTail, !IO),
set_nondet_shadow_stack_depth(Depth - 1, !IO)
).
:- pred rollback_stack(int::in, io::di, io::uo) is det.
:- pragma foreign_export("C#", rollback_stack(in, di, uo),
"SSDB_rollback_stack").
:- pragma foreign_export("Java", rollback_stack(in, di, uo),
"SSDB_rollback_stack").
rollback_stack(TargetCSN, !IO) :-
stack_top(StackFrame, !IO),
( if StackFrame ^ sf_csn =< TargetCSN then
set_cur_ssdb_csn(StackFrame ^ sf_csn, !IO)
else
stack_pop(!IO),
rollback_stack(TargetCSN, !IO)
).
:- pred rollback_nondet_stack(int::in, io::di, io::uo) is det.
:- pragma foreign_export("C#", rollback_nondet_stack(in, di, uo),
"SSDB_rollback_nondet_stack").
:- pragma foreign_export("Java", rollback_nondet_stack(in, di, uo),
"SSDB_rollback_nondet_stack").
rollback_nondet_stack(TargetCSN, !IO) :-
nondet_stack_depth(StackDepth, !IO),
( if StackDepth = 0 then
true
else
nondet_stack_index(0, StackFrame, !IO),
( if StackFrame ^ sf_csn =< TargetCSN then
true
else
nondet_stack_pop(!IO),
rollback_nondet_stack(TargetCSN, !IO)
)
).
%-----------------------------------------------------------------------------%
% should_stop_at_the_event(Event, CSN, EventNum, ProcId, Stop, AutoRetry).
%
% Figure out whether we should stop execution and start user interaction.
%
:- pred should_stop_at_this_event(ssdb_event_type::in, int::in, int::in,
ssdb_proc_id::in, bool::out, ssdb_retry::out, io::di, io::uo) is det.
should_stop_at_this_event(Event, EventNum, CSN, ProcId, ShouldStopAtEvent,
AutoRetry, !IO) :-
get_cur_ssdb_next_stop(NextStop, !IO),
(
NextStop = ns_step,
ShouldStopAtEvent0 = yes,
AutoRetry = do_not_retry
;
NextStop = ns_next(StopCSN),
is_same_int(StopCSN, CSN, ShouldStopAtEvent0),
AutoRetry = do_not_retry
;
NextStop = ns_continue,
check_breakpoint(ProcId, ShouldStopAtEvent0, !IO),
AutoRetry = do_not_retry
;
NextStop = ns_final_port(StopCSN, AutoRetry0),
(
( Event = ssdb_exit
; Event = ssdb_exit_nondet
; Event = ssdb_fail
; Event = ssdb_fail_nondet
),
( if StopCSN = CSN then
ShouldStopAtEvent0 = yes,
AutoRetry = AutoRetry0,
(
AutoRetry = do_retry,
% NOTE: The event number and CSN used to be reset at the
% time the user entered the `retry' command. That is
% incorrect as we may need to perform forward execution
% before reaching the final port of the target CSN to
% retry. During forward execution the counters are
% incremented as usual, so the debugger state is corrupted.
stack_top(Frame, !IO),
reset_counters_for_retry(Frame, !IO)
;
AutoRetry = do_not_retry
)
else
ShouldStopAtEvent0 = no,
AutoRetry = do_not_retry
)
;
Event = ssdb_excp,
% Stop immediately, unless there is an exception handler which will
% catch the exception before we reach the final port of StopCSN.
get_shadow_stack(Stack, !IO),
( if exception_handler_exists(StopCSN, Stack) then
ShouldStopAtEvent0 = no
else
ShouldStopAtEvent0 = yes
),
AutoRetry = do_not_retry
;
( Event = ssdb_call
; Event = ssdb_call_nondet
; Event = ssdb_redo_nondet
),
ShouldStopAtEvent0 = no,
AutoRetry = do_not_retry
)
;
NextStop = ns_final_port_nondet(StopCSN, AutoRetry0),
(
Event = ssdb_fail_nondet,
( if StopCSN = CSN then
ShouldStopAtEvent0 = yes,
AutoRetry = AutoRetry0,
(
AutoRetry = do_retry,
nondet_stack_index(0, Frame, !IO),
( if Frame ^ sf_csn = CSN then
% See note above.
reset_counters_for_retry(Frame, !IO)
else
error("ssdb: nondet stack frame has unexpected CSN")
)
;
AutoRetry = do_not_retry
)
else
ShouldStopAtEvent0 = no,
AutoRetry = do_not_retry
)
;
Event = ssdb_excp,
get_shadow_stack(Stack, !IO),
( if exception_handler_exists(StopCSN, Stack) then
ShouldStopAtEvent0 = no
else
ShouldStopAtEvent0 = yes
),
AutoRetry = do_not_retry
;
( Event = ssdb_call
; Event = ssdb_exit
; Event = ssdb_fail
; Event = ssdb_call_nondet
; Event = ssdb_exit_nondet
; Event = ssdb_redo_nondet
),
ShouldStopAtEvent0 = no,
AutoRetry = do_not_retry
)
;
NextStop = ns_nonexit,
(
( Event = ssdb_call
; Event = ssdb_fail
; Event = ssdb_call_nondet
; Event = ssdb_redo_nondet
; Event = ssdb_fail_nondet
; Event = ssdb_excp
),
ShouldStopAtEvent0 = yes
;
( Event = ssdb_exit
; Event = ssdb_exit_nondet
),
ShouldStopAtEvent0 = no
),
AutoRetry = do_not_retry
;
NextStop = ns_goto(EventNumToGo),
is_same_int(EventNumToGo, EventNum, ShouldStopAtEvent0),
AutoRetry = do_not_retry
;
NextStop = ns_exception,
(
Event = ssdb_excp,
ShouldStopAtEvent0 = yes
;
( Event = ssdb_call
; Event = ssdb_exit
; Event = ssdb_fail
; Event = ssdb_call_nondet
; Event = ssdb_exit_nondet
; Event = ssdb_redo_nondet
; Event = ssdb_fail_nondet
),
ShouldStopAtEvent0 = no
),
AutoRetry = do_not_retry
),
current_and_parent_frame_tracing_levels(CurrentLevel, ParentLevel, !IO),
( if
ShouldStopAtEvent0 = yes,
CurrentLevel = shallow,
ParentLevel = shallow
then
ShouldStopAtEvent = no
else
ShouldStopAtEvent = ShouldStopAtEvent0
).
:- pred current_and_parent_frame_tracing_levels(
ssdb_tracing_level::out, ssdb_tracing_level::out, io::di, io::uo) is det.
current_and_parent_frame_tracing_levels(CurrentLevel, ParentLevel, !IO) :-
get_shadow_stack(Stack, !IO),
(
Stack = [],
error("ssdb: current_frame_shallow_traced")
;
Stack = [Current | RestStack],
CurrentLevel = Current ^ sf_tracing_level,
(
RestStack = [],
ParentLevel = deep
;
RestStack = [Parent | _],
ParentLevel = Parent ^ sf_tracing_level
)
).
:- pred is_same_int(int::in, int::in, bool::out) is det.
is_same_int(IntA, IntB, IsSame) :-
IsSame = (if IntA = IntB then yes else no).
% update_next_stop(EventNum, CSN, WhatNext, Retry).
%
% Set the NextStop and the Retry variable according to the WhatNext value.
% In the case where the WathNext is set for a retry, it modify the
% debugger_state at his old value which it had at the call point.
%
:- pred update_next_stop(int::in, int::in, what_next::in, ssdb_retry::out,
io::di, io::uo) is det.
update_next_stop(EventNum, CSN, WhatNext, Retry, !IO) :-
(
WhatNext = wn_step,
NextStop = ns_step,
Retry = do_not_retry
;
WhatNext = wn_next,
NextStop = ns_next(CSN),
Retry = do_not_retry
;
WhatNext = wn_continue,
NextStop = ns_continue,
Retry = do_not_retry
;
WhatNext = wn_finish(EndCSN),
NextStop = ns_final_port(EndCSN, do_not_retry),
Retry = do_not_retry
;
WhatNext = wn_return,
NextStop = ns_nonexit,
Retry = do_not_retry
;
WhatNext = wn_exception,
NextStop = ns_exception,
Retry = do_not_retry
;
WhatNext = wn_retry(RetryCSN),
( if RetryCSN = CSN then
NextStop = ns_step,
Retry = do_retry,
stack_top(Frame, !IO),
reset_counters_for_retry(Frame, !IO)
else
NextStop = ns_final_port(RetryCSN, do_retry),
Retry = do_not_retry
)
;
WhatNext = wn_retry_nondet(RetryCSN),
NextStop = ns_final_port_nondet(RetryCSN, do_retry),
Retry = do_not_retry
;
WhatNext = wn_goto(EventNumToGo),
( if EventNum = EventNumToGo then
NextStop = ns_step,
Retry = do_not_retry
else
NextStop = ns_goto(EventNumToGo),
Retry = do_not_retry
)
),
set_cur_ssdb_next_stop(NextStop, !IO).
% Reset the event number and CSN counters in order to retry from event in
% the given frame.
%
:- pred reset_counters_for_retry(stack_frame::in, io::di, io::uo) is det.
reset_counters_for_retry(Frame, !IO) :-
set_cur_ssdb_event_number(Frame ^ sf_event_number - 1, !IO),
set_cur_ssdb_csn(Frame ^ sf_csn - 1, !IO).
:- pred exception_handler_exists(int::in, list(stack_frame)::in) is semidet.
exception_handler_exists(CSN, StackFrames) :-
list.member(StackFrame, StackFrames),
StackFrame ^ sf_csn >= CSN,
pred_catches_exceptions(StackFrame ^ sf_proc_id).
% Succeed if the given procedure is one which catches exceptions.
%
:- pred pred_catches_exceptions(ssdb_proc_id::in) is semidet.
pred_catches_exceptions(ProcId) :-
ProcId = ssdb_proc_id("exception", Name),
( Name = "try"
; Name = "try_io"
; Name = "try_store"
; Name = "try_all"
; Name = "incremental_try_all"
).
%----------------------------------------------------------------------------%
:- type ssdb_cmd
---> ssdb_step
; ssdb_next
; ssdb_goto
; ssdb_continue
; ssdb_finish
; ssdb_return
; ssdb_exception
; ssdb_retry
; ssdb_stack
; ssdb_print
; ssdb_browse
; ssdb_vars
; ssdb_down
; ssdb_up
; ssdb_level
; ssdb_current
; ssdb_format
; ssdb_format_param
; ssdb_alias
; ssdb_unalias
; ssdb_list
; ssdb_list_path
; ssdb_push_list_dir
; ssdb_pop_list_dir
; ssdb_list_context_lines
; ssdb_break
; ssdb_enable
; ssdb_disable
; ssdb_delete
; ssdb_help
; ssdb_source
; ssdb_quit.
:- pred ssdb_cmd_name(string, ssdb_cmd).
:- mode ssdb_cmd_name(in, out) is semidet.
:- mode ssdb_cmd_name(out, in) is det.
ssdb_cmd_name("step", ssdb_step).
ssdb_cmd_name("next", ssdb_next).
ssdb_cmd_name("goto", ssdb_goto).
ssdb_cmd_name("continue", ssdb_continue).
ssdb_cmd_name("finish", ssdb_finish).
ssdb_cmd_name("return", ssdb_return).
ssdb_cmd_name("exception", ssdb_exception).
ssdb_cmd_name("retry", ssdb_retry).
ssdb_cmd_name("stack", ssdb_stack).
ssdb_cmd_name("print", ssdb_print).
ssdb_cmd_name("browse", ssdb_browse).
ssdb_cmd_name("vars", ssdb_vars).
ssdb_cmd_name("down", ssdb_down).
ssdb_cmd_name("up", ssdb_up).
ssdb_cmd_name("level", ssdb_level).
ssdb_cmd_name("current", ssdb_current).
ssdb_cmd_name("format", ssdb_format).
ssdb_cmd_name("format_param", ssdb_format_param).
ssdb_cmd_name("alias", ssdb_alias).
ssdb_cmd_name("unalias", ssdb_unalias).
ssdb_cmd_name("list", ssdb_list).
ssdb_cmd_name("list_path", ssdb_list_path).
ssdb_cmd_name("push_list_dir", ssdb_push_list_dir).
ssdb_cmd_name("pop_list_dir", ssdb_pop_list_dir).
ssdb_cmd_name("list_context_lines", ssdb_list_context_lines).
ssdb_cmd_name("break", ssdb_break).
ssdb_cmd_name("enable", ssdb_enable).
ssdb_cmd_name("disable", ssdb_disable).
ssdb_cmd_name("delete", ssdb_delete).
ssdb_cmd_name("help", ssdb_help).
ssdb_cmd_name("source", ssdb_source).
ssdb_cmd_name("quit", ssdb_quit).
:- func init_command_queue = list(string).
init_command_queue =
[
"alias s step",
"alias g goto",
"alias f finish",
"alias r retry",
"alias v vars",
"alias p print",
"alias P print *",
"alias d stack",
"alias c continue",
"alias b break",
"alias h help",
"alias ? help",
"alias excp exception",
"alias e exception",
"alias EMPTY step",
"alias NUMBER step"
].
%---------------------------------------------------------------------------%
% Display the prompt, read a user command, and execute it.
% Depth is the level of the stack that the user is currently viewing.
%
:- pred read_and_execute_cmd(ssdb_event_type::in, int::in, what_next::out,
io::di, io::uo) is det.
read_and_execute_cmd(Event, Depth, WhatNext, !IO) :-
read_and_execute_cmd_2(0, Event, Depth, WhatNext, !IO).
:- pred read_and_execute_cmd_2(int::in, ssdb_event_type::in, int::in,
what_next::out, io::di, io::uo) is det.
read_and_execute_cmd_2(N, Event, Depth, WhatNext, !IO) :-
get_command_queue(Queue0, !IO),
(
Queue0 = [],
io.write_string("ssdb> ", !IO),
io.flush_output(!IO),
io.read_line_as_string(Result, !IO),
Interacting = yes
;
Queue0 = [QueuedString | Queue],
Result = ok(QueuedString),
set_command_queue(Queue, !IO),
Interacting = no
),
(
Result = ok(String),
% We don't yet support the `NUMBER COMMAND' syntax of mdb.
Words = string.words(String),
expand_alias_and_execute(Words, Interacting, Event, Depth, WhatNext,
!IO)
;
Result = eof,
execute_cmd(ssdb_quit, [], Interacting, Event, Depth, WhatNext, !IO)
;
Result = error(Error),
io.error_message(Error, Msg),
io.format("could not read command: %s\n", [s(Msg)], !IO),
% Some errors are transient, ie unknown key press, but if we get more
% than 10 errors in a row it's probably not a transient error so quit
( if N > 10 then
execute_cmd(ssdb_quit, ["-y"], no, Event, Depth, WhatNext, !IO)
else
read_and_execute_cmd_2(N + 1, Event, Depth, WhatNext, !IO)
)
).
:- pred expand_alias_and_execute(list(string)::in, bool::in,
ssdb_event_type::in, int::in, what_next::out, io::di, io::uo) is det.
expand_alias_and_execute(Words, Interacting, Event, Depth, WhatNext, !IO) :-
get_aliases(Aliases, !IO),
(
Words = [],
( if map.search(Aliases, "EMPTY", [AliasWord | AliasWords]) then
execute_cmd_string(AliasWord, AliasWords, Interacting,
Event, Depth, WhatNext, !IO)
else
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
;
Words = [FirstWord | LaterWords],
( if
nonnegative_int(FirstWord, _),
map.search(Aliases, "NUMBER", [AliasWord | AliasWords])
then
% Include the number itself as an argument.
execute_cmd_string(AliasWord, AliasWords ++ Words, Interacting,
Event, Depth, WhatNext, !IO)
else if
map.search(Aliases, FirstWord, [AliasWord | AliasWords])
then
execute_cmd_string(AliasWord, AliasWords ++ LaterWords,
Interacting, Event, Depth, WhatNext, !IO)
else
execute_cmd_string(FirstWord, LaterWords, Interacting,
Event, Depth, WhatNext, !IO)
)
).
:- pred execute_cmd_string(string::in, list(string)::in, bool::in,
ssdb_event_type::in, int::in, what_next::out, io::di, io::uo) is det.
execute_cmd_string(CmdWord, ArgWords, Interacting, Event, Depth, WhatNext, !IO)
:-
( if ssdb_cmd_name(CmdWord, Cmd) then
execute_cmd(Cmd, ArgWords, Interacting, Event, Depth, WhatNext, !IO)
else
io.format("Unknown command `%s' (try \"help\").\n", [s(CmdWord)], !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred execute_cmd(ssdb_cmd::in, list(string)::in, bool::in,
ssdb_event_type::in, int::in, what_next::out, io::di, io::uo) is det.
execute_cmd(Cmd, Args, Interacting, Event, Depth, WhatNext, !IO) :-
(
Cmd = ssdb_step,
execute_ssdb_step(Args, Event, Depth, WhatNext, !IO)
;
Cmd = ssdb_next,
execute_ssdb_next(Args, Event, Depth, WhatNext, !IO)
;
Cmd = ssdb_goto,
execute_ssdb_goto(Args, Event, Depth, WhatNext, !IO)
;
Cmd = ssdb_continue,
execute_ssdb_continue(Args, Event, Depth, WhatNext, !IO)
;
Cmd = ssdb_finish,
execute_ssdb_finish(Args, Event, Depth, WhatNext, !IO)
;
Cmd = ssdb_return,
execute_ssdb_return(Args, Event, Depth, WhatNext, !IO)
;
Cmd = ssdb_exception,
execute_ssdb_exception(Args, Event, Depth, WhatNext, !IO)
;
Cmd = ssdb_retry,
execute_ssdb_retry(Args, Event, Depth, WhatNext, !IO)
;
(
Cmd = ssdb_down,
execute_ssdb_down(Args, Depth, NewDepth, !IO)
;
Cmd = ssdb_up,
execute_ssdb_up(Args, Depth, NewDepth, !IO)
;
Cmd = ssdb_level,
execute_ssdb_level(Args, Depth, NewDepth, !IO)
),
read_and_execute_cmd(Event, NewDepth, WhatNext, !IO)
;
(
Cmd = ssdb_stack,
execute_ssdb_stack(Args, Depth, !IO)
;
Cmd = ssdb_print,
execute_ssdb_print(Args, Depth, !IO)
;
Cmd = ssdb_browse,
execute_ssdb_browse(Args, Depth, !IO)
;
Cmd = ssdb_vars,
execute_ssdb_vars(Args, Depth, !IO)
;
Cmd = ssdb_current,
execute_ssdb_current(Args, Event, !IO)
;
Cmd = ssdb_format,
execute_ssdb_format(Args, !IO)
;
Cmd = ssdb_format_param,
execute_ssdb_format_param(Args, !IO)
;
Cmd = ssdb_alias,
execute_ssdb_alias(Args, Interacting, !IO)
;
Cmd = ssdb_unalias,
execute_ssdb_unalias(Args, Interacting, !IO)
;
Cmd = ssdb_list,
execute_ssdb_list(Args, Depth, !IO)
;
Cmd = ssdb_list_path,
execute_ssdb_list_path(Args, !IO)
;
Cmd = ssdb_push_list_dir,
execute_ssdb_push_list_dir(Args, !IO)
;
Cmd = ssdb_pop_list_dir,
execute_ssdb_pop_list_dir(Args, !IO)
;
Cmd = ssdb_list_context_lines,
execute_ssdb_list_context_lines(Args, !IO)
;
Cmd = ssdb_break,
execute_ssdb_break(Args, !IO)
;
Cmd = ssdb_enable,
execute_ssdb_enable(Args, !IO)
;
Cmd = ssdb_disable,
execute_ssdb_disable(Args, !IO)
;
Cmd = ssdb_delete,
execute_ssdb_delete(Args, !IO)
;
Cmd = ssdb_help,
execute_ssdb_help(Args, !IO)
;
Cmd = ssdb_source,
execute_ssdb_source(Args, !IO)
;
Cmd = ssdb_quit,
execute_ssdb_quit(Args, Interacting, !IO)
),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_help(list(string)::in, io::di, io::uo) is det.
execute_ssdb_help(Args, !IO) :-
(
Args = [],
print_help(!IO)
;
Args = [_ | _],
% We should provide more detailed help if the user specifies a command
% name.
print_too_many_arguments(!IO)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_step(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_step(Args, Event, Depth, WhatNext, !IO) :-
(
Args = [],
WhatNext = wn_step
;
Args = [_ | _],
( if
Args = [NStr],
string.to_int(NStr, N),
N > 0
then
get_cur_ssdb_event_number(EventNumber, !IO),
WhatNext = wn_goto(EventNumber + N)
else
print_expect_integer(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
).
:- pred execute_ssdb_next(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_next(Args, Event, Depth, WhatNext, !IO) :-
(
Args = [],
( if
( Event = ssdb_call
; Event = ssdb_call_nondet
; Event = ssdb_redo_nondet
)
then
WhatNext = wn_next
else
io.write_string("The `next' command can be executed "
++ "only at a call or redo port.\n", !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
;
Args = [_ | _],
print_too_many_arguments(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred execute_ssdb_goto(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_goto(Args, Event, Depth, WhatNext, !IO) :-
(
Args = [],
print_expect_integer(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
;
Args = [Arg],
( if nonnegative_int(Arg, Num) then
get_cur_ssdb_event_number(CurEventNum, !IO),
( if Num > CurEventNum then
WhatNext = wn_goto(Num)
else
io.write_string("The debugger cannot go to a past event.\n",
!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
else
print_invalid_argument(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred execute_ssdb_continue(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_continue(Args, Event, Depth, WhatNext, !IO) :-
(
Args = [],
WhatNext = wn_continue
;
Args = [_ | _],
print_too_many_arguments(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred execute_ssdb_finish(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_finish(Args, Event, Depth, WhatNext, !IO) :-
(
Args = [],
( if
( Event = ssdb_call
; Event = ssdb_call_nondet
; Event = ssdb_redo_nondet
)
then
stack_top(StackFrame, !IO),
CSN = StackFrame ^ sf_csn,
WhatNext = wn_finish(CSN)
else
io.write_string("The `finish' command can be executed "
++ "only at a call or redo port.\n", !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
;
Args = [Arg],
( if nonnegative_int(Arg, Num) then
stack_depth(CurDepth, !IO),
( if Num < CurDepth then
stack_index(Num, StackFrame, !IO),
CSN = StackFrame ^ sf_csn,
WhatNext = wn_finish(CSN)
else
io.format("The depth must be between 0 and %i.\n",
[i(CurDepth - 1)], !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
else
print_invalid_argument(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred execute_ssdb_return(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_return(Args, Event, Depth, WhatNext, !IO) :-
(
Args = [],
(
( Event = ssdb_exit
; Event = ssdb_exit_nondet
),
WhatNext = wn_return
;
( Event = ssdb_call
; Event = ssdb_fail
; Event = ssdb_call_nondet
; Event = ssdb_redo_nondet
; Event = ssdb_fail_nondet
; Event = ssdb_excp
),
io.write_string("This command is a no-op from this port.\n", !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
;
Args = [_ | _],
print_too_many_arguments(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred execute_ssdb_exception(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_exception(Args, Event, Depth, WhatNext, !IO) :-
(
Args = [],
WhatNext = wn_exception
;
Args = [_ | _],
io.write_string("The exception command accepts no arguments.\n", !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_retry(list(string)::in, ssdb_event_type::in,
int::in, what_next::out, io::di, io::uo) is det.
execute_ssdb_retry(Args, Event, Depth, WhatNext, !IO) :-
% XXX: For some reason, the original code here handled the case of the
% number argument being zero as if the command had no argument at all.
(
Args = [],
execute_ssdb_retry_2(0, Event, Depth, WhatNext, !IO)
;
Args = [Arg],
( if nonnegative_int(Arg, Num) then
stack_depth(CurDepth, !IO),
( if Num < CurDepth then
execute_ssdb_retry_2(Num, Event, Depth, WhatNext, !IO)
else
io.format("The depth must be between 0 and %i.\n",
[i(CurDepth - 1)], !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
else
print_invalid_argument(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred execute_ssdb_retry_2(int::in, ssdb_event_type::in, int::in,
what_next::out, io::di, io::uo) is det.
execute_ssdb_retry_2(Num, Event, Depth, WhatNext, !IO) :-
stack_index(Num, Frame, !IO),
CSN = Frame ^ sf_csn,
(
( Event = ssdb_exit
; Event = ssdb_fail
; Event = ssdb_fail_nondet
),
WhatNext = wn_retry(CSN)
;
Event = ssdb_exit_nondet,
nondet_stack_contains_csn(CSN, Found, !IO),
(
Found = yes,
WhatNext = wn_retry_nondet(CSN)
;
Found = no,
WhatNext = wn_retry(CSN)
)
;
( Event = ssdb_call
; Event = ssdb_call_nondet
; Event = ssdb_redo_nondet
; Event = ssdb_excp
),
io.write_string("Cannot retry at call or redo port.\n", !IO),
read_and_execute_cmd(Event, Depth, WhatNext, !IO)
).
:- pred nondet_stack_contains_csn(int::in, bool::out, io::di, io::uo) is det.
nondet_stack_contains_csn(CSN, Contains, !IO) :-
nondet_stack_depth(StackDepth, !IO),
nondet_stack_contains_csn_2(CSN, StackDepth - 1, Contains, !IO).
:- pred nondet_stack_contains_csn_2(int::in, int::in, bool::out,
io::di, io::uo) is det.
nondet_stack_contains_csn_2(CSN, Depth, Contains, !IO) :-
( if Depth < 0 then
Contains = no
else
nondet_stack_index(Depth, StackFrame, !IO),
( if CSN = StackFrame ^ sf_csn then
Contains = yes
else
nondet_stack_contains_csn_2(CSN, Depth - 1, Contains, !IO)
)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_stack(list(string)::in, int::in, io::di, io::uo) is det.
execute_ssdb_stack(Args, Depth, !IO) :-
(
Args = [],
print_stack_trace(0, Depth, int.max_int, !IO)
;
Args = [_ | _],
( if
Args = [NStr],
string.to_int(NStr, N),
N > 0
then
print_stack_trace(0, Depth, N, !IO)
else
print_expect_integer(!IO)
)
).
:- pred execute_ssdb_print(list(string)::in, int::in, io::di, io::uo) is det.
execute_ssdb_print(!.Args, Depth, !IO) :-
process_options(print_options, !Args, no, Res),
(
Res = ok(MaybeFormat),
stack_index(Depth, StackFrame, !IO),
( if !.Args = [] then
Term = goal_to_synthetic_term(StackFrame),
print_browser_term(MaybeFormat, print, Term, !IO)
else if !.Args = ["*"] then
ListVarValue = StackFrame ^ sf_list_var_value,
(
ListVarValue = [],
io.write_string("ssdb: there are no live variables.\n", !IO)
;
ListVarValue = [_ | _],
print_vars(MaybeFormat, print_all, ListVarValue, !IO)
)
else if !.Args = [Arg] then
ListVarValue = StackFrame ^ sf_list_var_value,
print_var_with_name(MaybeFormat, ListVarValue, Arg, !IO)
else
print_too_many_arguments(!IO)
)
;
Res = error(Error),
io.write_string("ssdb: ", !IO),
io.write_string(io.error_message(Error), !IO),
io.nl(!IO)
).
:- pred print_options(string::in, maybe(portray_format)::in,
maybe(portray_format)::out) is semidet.
print_options("--flat", _, yes(flat)).
print_options("--pretty", _, yes(pretty)).
print_options("--raw", _, yes(raw_pretty)).
print_options("--verbose", _, yes(verbose)).
print_options("-f", _, yes(flat)).
print_options("-p", _, yes(pretty)).
print_options("-r", _, yes(raw_pretty)).
print_options("-v", _, yes(verbose)).
:- func goal_to_synthetic_term(stack_frame) = browser_term.
goal_to_synthetic_term(StackFrame) = Term :-
ProcId = StackFrame ^ sf_proc_id,
ProcId = ssdb_proc_id(_ModuleName, ProcName),
% XXX I/O state arguments at the end of this list will be missing.
% This can be fixed once we have the procedure arity.
make_arg_univs(StackFrame ^ sf_list_var_value, 0, ArgUnivs),
% XXX We need to know if the procedure is a predicate or function.
FuncReturn = no,
Term = synthetic_term(ProcName, ArgUnivs, FuncReturn).
:- pred make_arg_univs(list(var_value)::in, int::in, list(univ)::out) is det.
make_arg_univs([], _, []).
make_arg_univs([Var | Vars], Pos, ArgUnivs) :-
(
Var = unbound_head_var(_, VarPos),
( if VarPos = Pos then
make_arg_univs(Vars, Pos + 1, ArgUnivs0)
else
make_arg_univs(Vars, Pos, ArgUnivs0)
),
type_to_univ('_' : mdb.print_term.unbound, Univ),
ArgUnivs = [Univ | ArgUnivs0]
;
Var = bound_head_var(_, VarPos, Value),
( if VarPos = Pos then
make_arg_univs(Vars, Pos + 1, ArgUnivs0),
type_to_univ(Value, Univ)
else
make_arg_univs(Vars, Pos, ArgUnivs0),
type_to_univ('_' : mdb.print_term.unbound, Univ)
),
ArgUnivs = [Univ | ArgUnivs0]
;
Var = bound_other_var(_, _),
make_arg_univs(Vars, Pos, ArgUnivs)
).
:- pred execute_ssdb_browse(list(string)::in, int::in, io::di, io::uo) is det.
execute_ssdb_browse(Args, Depth, !IO) :-
stack_index(Depth, StackFrame, !IO),
(
Args = [],
browse_term(goal_to_synthetic_term(StackFrame), !IO)
;
Args = [VarName],
ListVarValue = StackFrame ^ sf_list_var_value,
browse_var(ListVarValue, VarName, !IO)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
:- pred execute_ssdb_vars(list(string)::in, int::in, io::di, io::uo) is det.
execute_ssdb_vars(Args, Depth, !IO) :-
(
Args = [],
stack_index(Depth, StackFrame, !IO),
ListVarValue = StackFrame ^ sf_list_var_value,
print_vars_list(ListVarValue, 1, !IO)
;
Args = [_ | _],
print_too_many_arguments(!IO)
).
:- pred execute_ssdb_down(list(string)::in, int::in, int::out, io::di, io::uo)
is det.
execute_ssdb_down(Args, !Depth, !IO) :-
execute_ssdb_up_down(Args, -1, !Depth, !IO).
:- pred execute_ssdb_up(list(string)::in, int::in, int::out, io::di, io::uo)
is det.
execute_ssdb_up(Args, !Depth, !IO) :-
execute_ssdb_up_down(Args, 1, !Depth, !IO).
:- pred execute_ssdb_up_down(list(string)::in, int::in, int::in, int::out,
io::di, io::uo) is det.
execute_ssdb_up_down(Args, Direction, !Depth, !IO) :-
(
Args = [],
change_depth(!.Depth + Direction, !Depth, !IO)
;
Args = [Arg],
( if nonnegative_int(Arg, N) then
change_depth(!.Depth + N * Direction, !Depth, !IO)
else
print_expect_integer(!IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
:- pred execute_ssdb_level(list(string)::in, int::in, int::out, io::di, io::uo)
is det.
execute_ssdb_level(Args, !Depth, !IO) :-
(
Args = [],
print_expect_argument(!IO)
;
Args = [Arg],
( if nonnegative_int(Arg, N) then
change_depth(N, !Depth, !IO)
else
print_expect_integer(!IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
:- pred change_depth(int::in, int::in, int::out, io::di, io::uo) is det.
change_depth(ChangedDepth, !Depth, !IO) :-
stack_depth(StackDepth, !IO),
( if ChangedDepth < 0 then
io.write_string("ssdb: that stack frame does not exist.\n", !IO)
else if ChangedDepth >= StackDepth then
io.write_string("ssdb: not that many ancestors.\n", !IO)
else
print_depth_change(ChangedDepth, !IO),
!:Depth = ChangedDepth
).
:- pred execute_ssdb_current(list(string)::in, ssdb_event_type::in,
io::di, io::uo) is det.
execute_ssdb_current(Args, Event, !IO) :-
(
Args = [],
get_cur_ssdb_event_number(EventNum, !IO),
print_event_info(Event, EventNum, !IO)
;
Args = [_ | _],
print_too_many_arguments(!IO)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_format(list(string)::in, io::di, io::uo) is det.
execute_ssdb_format(!.Args, !IO) :-
Config0 = format_config(no, no, no, no, no, no, no),
process_options(format_options, !Args, Config0, Res),
(
Res = ok(format_config(P, B, A, F, Pr, V, NPr)),
( if
!.Args = [Word],
is_portray_format(Word, Format)
then
get_browser_state(State0, !IO),
FromBrowser = no,
set_browser_param(FromBrowser, P, B, A, F, Pr, V, NPr,
setting_format(Format), State0, State),
set_browser_state(State, !IO)
else
io.write_string("ssdb: cannot set to unknown format.\n", !IO)
)
;
Res = error(Error),
io.write_string("ssdb: ", !IO),
io.write_string(io.error_message(Error), !IO),
io.nl(!IO)
).
:- pred execute_ssdb_format_param(list(string)::in, io::di, io::uo) is det.
execute_ssdb_format_param(!.Args, !IO) :-
Config0 = format_config(no, no, no, no, no, no, no),
process_options(format_param_options, !Args, Config0, Res),
(
Res = ok(format_config(P, B, A, F, Pr, V, NPr)),
( if format_param_setting(!.Args, Setting) then
get_browser_state(State0, !IO),
FromBrowser = no,
set_browser_param(FromBrowser, P, B, A, F, Pr, V, NPr, Setting,
State0, State),
set_browser_state(State, !IO)
else
io.write_string("ssdb: invalid format parameter.\n", !IO)
)
;
Res = error(Error),
io.write_string("ssdb: ", !IO),
io.write_string(io.error_message(Error), !IO),
io.nl(!IO)
).
:- type format_config
---> format_config(
print :: bool,
browse :: bool,
print_all :: bool,
f :: bool,
r :: bool,
v :: bool,
p :: bool
).
:- pred format_options(string::in, format_config::in, format_config::out)
is semidet.
format_options(Opt, !Config) :-
(
( Opt = "-P"
; Opt = "--print"
),
!Config ^ print := yes
;
( Opt = "-B"
; Opt = "--browse"
),
!Config ^ browse := yes
;
( Opt = "-A"
; Opt = "--print-all"
),
!Config ^ print_all := yes
).
:- pred format_param_options(string::in, format_config::in, format_config::out)
is semidet.
format_param_options(Opt, !Config) :-
(
( Opt = "-P"
; Opt = "--print"
),
!Config ^ print := yes
;
( Opt = "-B"
; Opt = "--browse"
),
!Config ^ browse := yes
;
( Opt = "-A"
; Opt = "--print-all"
),
!Config ^ print_all := yes
;
( Opt = "-f"
; Opt = "--flat"
),
!Config ^ f := yes
;
( Opt = "-r"
; Opt = "--raw"
),
!Config ^ r := yes
;
( Opt = "-v"
; Opt = "--verbose"
),
!Config ^ v := yes
;
( Opt = "-p"
; Opt = "--pretty"
),
!Config ^ p := yes
).
:- pred is_portray_format(string, portray_format).
:- mode is_portray_format(in, out) is semidet.
:- mode is_portray_format(out, in) is det.
is_portray_format("flat", flat).
is_portray_format("raw_pretty", raw_pretty).
is_portray_format("verbose", verbose).
is_portray_format("pretty", pretty).
:- pred format_param_setting(list(string)::in, browser_info.setting::out)
is semidet.
format_param_setting([Word, ValueStr], Setting) :-
nonnegative_int(ValueStr, Value),
(
Word = "depth",
Setting = setting_depth(Value)
;
Word = "size",
Setting = setting_size(Value)
;
Word = "width",
Setting = setting_width(Value)
;
Word = "lines",
Setting = setting_lines(Value)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_alias(list(string)::in, bool::in, io::di, io::uo) is det.
execute_ssdb_alias(Args, Interacting, !IO) :-
get_aliases(Aliases0, !IO),
(
Args = [],
map.foldl(print_alias, Aliases0, !IO)
;
Args = [Name],
( if map.search(Aliases0, Name, Command) then
print_alias(Name, Command, !IO)
else
io.write_string("There is no such alias.\n", !IO)
)
;
Args = [Name | Words],
Words = [Command | _],
( if ssdb_cmd_name(Command, _) then
map.set(Name, Words, Aliases0, Aliases),
set_aliases(Aliases, !IO),
(
Interacting = yes,
print_alias(Name, Words, !IO)
;
Interacting = no
)
else
io.format("`%s' is not a valid command.\n", [s(Command)], !IO)
)
).
:- pred execute_ssdb_unalias(list(string)::in, bool::in, io::di, io::uo)
is det.
execute_ssdb_unalias(Args, Interacting, !IO) :-
( if Args = [Name] then
get_aliases(Aliases0, !IO),
( if map.remove(Name, _, Aliases0, Aliases) then
set_aliases(Aliases, !IO),
(
Interacting = yes,
io.format("Alias `%s' removed.\n", [s(Name)], !IO)
;
Interacting = no
)
else
io.format("Alias `%s' cannot be removed, " ++
"since it does not exist.\n", [s(Name)], !IO)
)
else
print_expect_argument(!IO)
).
:- pred print_alias(string::in, list(string)::in, io::di, io::uo) is det.
print_alias(Name, Command, !IO) :-
io.write_string(Name, !IO),
io.write_string("\t=>\t", !IO),
io.write_list(Command, " ", io.write_string, !IO),
io.nl(!IO).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_list(list(string)::in, int::in, io::di, io::uo) is det.
execute_ssdb_list(Args, Depth, !IO) :-
(
Args = [],
get_list_params(Params, !IO),
ContextLines = Params ^ list_context_lines,
execute_ssdb_list_2(ContextLines, Depth, !IO)
;
Args = [Arg],
( if nonnegative_int(Arg, ContextLines) then
execute_ssdb_list_2(ContextLines, Depth, !IO)
else
print_expect_integer(!IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
:- pred execute_ssdb_list_2(int::in, int::in, io::di, io::uo) is det.
execute_ssdb_list_2(ContextLines, Depth, !IO) :-
stack_index(Depth, StackFrame, !IO),
FileName = StackFrame ^ sf_call_site_file,
MarkLine = StackFrame ^ sf_call_site_line,
( if FileName = "" then
io.write_string("ssdb: sorry, call site is unknown.\n", !IO)
else
FirstLine = int.max(0, MarkLine - ContextLines),
LastLine = MarkLine + ContextLines,
io.output_stream(StdOut, !IO),
io.stderr_stream(StdErr, !IO),
get_list_params(Params, !IO),
ListPath = Params ^ list_path,
list_file_portable(StdOut, StdErr, FileName, FirstLine, LastLine,
MarkLine, ListPath, !IO)
).
:- pred execute_ssdb_list_path(list(string)::in, io::di, io::uo) is det.
execute_ssdb_list_path(Args, !IO) :-
(
Args = [],
get_list_params(Params, !IO),
Dirs = get_list_path(Params ^ list_path),
(
Dirs = [],
io.write_string("Context search path is empty\n", !IO)
;
Dirs = [_ | _],
io.write_string("Context search path: ", !IO),
io.write_list(Dirs, " ", io.write_string, !IO),
io.nl(!IO)
)
;
Args = [_ | _],
get_list_params(Params0, !IO),
ListPath0 = Params0 ^ list_path,
set_list_path(Args, ListPath0, ListPath),
Params = Params0 ^ list_path := ListPath,
set_list_params(Params, !IO)
).
:- pred execute_ssdb_push_list_dir(list(string)::in, io::di, io::uo) is det.
execute_ssdb_push_list_dir(Args, !IO) :-
(
Args = [],
print_expect_argument(!IO)
;
Args = [_ | _],
get_list_params(Params0, !IO),
ListPath0 = Params0 ^ list_path,
list.foldr(push_list_path, Args, ListPath0, ListPath),
Params = Params0 ^ list_path := ListPath,
set_list_params(Params, !IO)
).
:- pred execute_ssdb_pop_list_dir(list(string)::in, io::di, io::uo) is det.
execute_ssdb_pop_list_dir(Args, !IO) :-
(
Args = [],
get_list_params(Params0, !IO),
ListPath0 = Params0 ^ list_path,
pop_list_path(ListPath0, ListPath),
Params = Params0 ^ list_path := ListPath,
set_list_params(Params, !IO)
;
Args = [_ | _],
print_too_many_arguments(!IO)
).
:- pred execute_ssdb_list_context_lines(list(string)::in, io::di, io::uo)
is det.
execute_ssdb_list_context_lines(Args, !IO) :-
(
Args = [],
get_list_params(Params, !IO),
Lines = Params ^ list_context_lines,
io.format("Printing %d lines around each context listing.\n",
[i(Lines)], !IO)
;
Args = [Arg],
( if nonnegative_int(Arg, N) then
get_list_params(Params0, !IO),
Params = Params0 ^ list_context_lines := N,
set_list_params(Params, !IO)
else
print_expect_integer(!IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_break(list(string)::in, io::di, io::uo) is det.
execute_ssdb_break(Args, !IO) :-
(
Args = [],
print_expect_argument(!IO)
;
Args = [Arg],
( if Arg = "info" then
get_breakpoints_map(BreakPoints, !IO),
print_breakpoints(BreakPoints, !IO)
else if split_module_pred_name(Arg, ModuleName, PredName) then
ProcId = ssdb_proc_id(ModuleName, PredName),
add_breakpoint(ProcId, !IO)
else
io.write_string("ssdb: invalid argument.\n", !IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
:- pred split_module_pred_name(string::in, string::out, string::out)
is semidet.
split_module_pred_name(String, ModuleName, PredName) :-
ModuleDot = string.rstrip_pred(non_dot, String),
Sep = string.length(ModuleDot),
ModuleName = string.left(String, Sep - 1),
ModuleName \= "",
PredName = string.right(String, string.length(String) - Sep),
PredName \= "".
:- pred non_dot(char::in) is semidet.
non_dot(C) :-
C \= ('.').
:- pred execute_ssdb_enable(list(string)::in, io::di, io::uo) is det.
execute_ssdb_enable(Args, !IO) :-
(
Args = [],
print_expect_argument(!IO)
;
Args = [Arg],
( if Arg = "*" then
modify_breakpoint_states(bp_state_enabled, !IO)
else if nonnegative_int(Arg, Num) then
modify_breakpoint_state(Num, bp_state_enabled, !IO)
else
print_invalid_argument(!IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
:- pred execute_ssdb_disable(list(string)::in, io::di, io::uo) is det.
execute_ssdb_disable(Args, !IO) :-
(
Args = [],
print_expect_argument(!IO)
;
Args = [Arg],
( if Arg = "*" then
modify_breakpoint_states(bp_state_disabled, !IO)
else if nonnegative_int(Arg, Num) then
modify_breakpoint_state(Num, bp_state_disabled, !IO)
else
print_invalid_argument(!IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
:- pred execute_ssdb_delete(list(string)::in, io::di, io::uo) is det.
execute_ssdb_delete(Args, !IO) :-
(
Args = [],
print_expect_argument(!IO)
;
Args = [Arg],
( if Arg = "*" then
get_breakpoints_map(BreakPoints, !IO),
print_breakpoints(BreakPoints, !IO),
set_breakpoints_map(map.init, !IO),
set_breakpoints_filter(new_breakpoints_filter, !IO)
else if nonnegative_int(Arg, Num) then
delete_breakpoint(Num, !IO)
else
print_invalid_argument(!IO)
)
;
Args = [_, _ | _],
print_too_many_arguments(!IO)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_source(list(string)::in, io::di, io::uo) is det.
execute_ssdb_source(Args, !IO) :-
( if Args = [FileName] then
io.open_input(FileName, OpenRes, !IO),
(
OpenRes = ok(Stream),
read_command_lines(Stream, [], RevLines, !IO),
io.close_input(Stream, !IO),
get_command_queue(Queue0, !IO),
Queue = list.reverse(RevLines) ++ Queue0,
set_command_queue(Queue, !IO)
;
OpenRes = error(Error),
io.stderr_stream(ErrorStream, !IO),
io.write_string(ErrorStream, "ssdb: ", !IO),
io.write_string(ErrorStream, io.error_message(Error), !IO),
io.nl(ErrorStream, !IO)
)
else
io.write_string("ssdb: `source' command expects filename argument.\n",
!IO)
).
:- pred read_command_lines(io.text_input_stream::in,
list(string)::in, list(string)::out, io::di, io::uo) is det.
read_command_lines(Stream, !RevLines, !IO) :-
io.read_line_as_string(Stream, Res, !IO),
(
Res = ok(Line),
Words = string.words(Line),
(
Words = []
;
Words = [First | _],
( if string.prefix(First, "#") then
true
else
!:RevLines = [Line | !.RevLines]
)
),
read_command_lines(Stream, !RevLines, !IO)
;
Res = eof
;
Res = error(Error),
io.stderr_stream(ErrorStream, !IO),
io.write_string(ErrorStream, "ssdb: ", !IO),
io.write_string(ErrorStream, io.error_message(Error), !IO),
io.nl(ErrorStream, !IO)
).
%-----------------------------------------------------------------------------%
:- pred execute_ssdb_quit(list(string)::in, bool::in, io::di, io::uo) is det.
execute_ssdb_quit(Args, Interacting, !IO) :-
(
Args = [],
Interacting = yes,
io.write_string("ssdb: are you sure you want to quit? ", !IO),
io.flush_output(!IO),
io.read_line_as_string(Result, !IO),
(
Result = ok(String),
( if
( string.prefix(String, "y")
; string.prefix(String, "Y")
)
then
exit_process(!IO)
else
true
)
;
Result = eof,
exit_process(!IO)
;
Result = error(_Error),
exit_process(!IO)
)
;
Args = [],
Interacting = no
% Don't quit.
;
Args = [_ | _],
( if Args = ["-y"] then
exit_process(!IO)
else
io.write_string("ssdb: invalid argument.\n", !IO)
)
).
%-----------------------------------------------------------------------------%
%
% Breakpoints
%
:- pred add_breakpoint(ssdb_proc_id::in, io::di, io::uo) is det.
add_breakpoint(ProcId, !IO) :-
get_breakpoints_map(BreakPoints0, !IO),
( if map.contains(BreakPoints0, ProcId) then
io.write_string("The breakpoint already exists.\n", !IO)
else
get_free_breakpoint_number(BreakPoints0, Number),
NewBreakPoint = breakpoint(Number, ProcId, bp_state_enabled),
map.det_insert(ProcId, NewBreakPoint, BreakPoints0, BreakPoints),
set_breakpoints_map(BreakPoints, !IO),
get_breakpoints_filter(Filter0, !IO),
set_breakpoints_filter_bits(NewBreakPoint, Filter0, Filter),
set_breakpoints_filter(Filter, !IO),
print_breakpoint(NewBreakPoint, !IO)
).
:- pred get_free_breakpoint_number(breakpoints_map::in, int::out) is det.
get_free_breakpoint_number(BreakPointsMap, Number) :-
map.values(BreakPointsMap, BreakPoints),
Numbers = list.map(bp_number, BreakPoints),
list.sort(Numbers, SortedNumbers),
first_unseen(SortedNumbers, 0, Number).
:- func bp_number(breakpoint) = int.
:- pred first_unseen(list(int)::in, int::in, int::out) is det.
first_unseen([], N, N).
first_unseen([H | T], N0, N) :-
( if H = N0 then
first_unseen(T, N0 + 1, N)
else
N = N0
).
% Disable or enable all breakpoints.
%
:- pred modify_breakpoint_states(bp_state::in, io::di, io::uo) is det.
modify_breakpoint_states(State, !IO) :-
get_breakpoints_map(BreakPoints0, !IO),
SetState = (func(BP) = BP ^ bp_state := State),
map.map_values_only(SetState, BreakPoints0) = BreakPoints,
set_breakpoints_map(BreakPoints, !IO),
generate_breakpoints_filter(BreakPoints, Filter),
set_breakpoints_filter(Filter, !IO),
print_breakpoints(BreakPoints, !IO).
% modify_state_breakpoint_with_num(State, Num, !IO).
%
% Modify the state of the breakpoint with the number which match Num.
%
:- pred modify_breakpoint_state(int::in, bp_state::in, io::di, io::uo) is det.
modify_breakpoint_state(Num, State, !IO) :-
get_breakpoints_map(BreakPoints0, !IO),
( if find_breakpoint(BreakPoints0, Num, Key, BreakPoint0) then
BreakPoint = BreakPoint0 ^ bp_state := State,
map.det_update(Key, BreakPoint, BreakPoints0, BreakPoints),
set_breakpoints_map(BreakPoints, !IO),
generate_breakpoints_filter(BreakPoints, Filter),
set_breakpoints_filter(Filter, !IO),
print_breakpoint(BreakPoint, !IO)
else
io.format("ssdb: break point #%d does not exist.\n", [i(Num)], !IO)
).
% delete_breakpoint(Num, !IO).
%
% Delete the breakpoint that match with Num.
%
:- pred delete_breakpoint(int::in, io::di, io::uo) is det.
delete_breakpoint(Num, !IO) :-
get_breakpoints_map(BreakPoints0, !IO),
( if find_breakpoint(BreakPoints0, Num, ProcId, BreakPoint) then
map.delete(ProcId, BreakPoints0, BreakPoints),
set_breakpoints_map(BreakPoints, !IO),
generate_breakpoints_filter(BreakPoints, Filter),
set_breakpoints_filter(Filter, !IO),
print_breakpoint(BreakPoint, !IO)
else
io.format("ssdb: break point #%d does not exist.\n", [i(Num)], !IO)
).
% find_breakpoint(BreakPoints, Num, Key, BreakPoint)
%
% Return the breakpoint with the given id number.
%
:- pred find_breakpoint(breakpoints_map::in, int::in,
ssdb_proc_id::out, breakpoint::out) is semidet.
find_breakpoint(BreakPoints, Num, Key, BreakPoint) :-
% Breakpoints have unique integer ids so there is at most one solution.
promise_equivalent_solutions [Key, BreakPoint] (
map.member(BreakPoints, Key, BreakPoint),
BreakPoint ^ bp_number = Num
).
% At every event we will check if we have reached a breakpoint. To minimise
% the cost of these checks we use a simple Bloom filter, where, for each
% breakpoint which is enabled, bits k1 and k2 of the bitmap are set:
%
% k1 = hash(PredName) mod N,
% k2 = hash(ModuleName) mod N,
% N = bitmap size
%
% This is very quick to check. Obviously, false positives are possible but
% the relatively slow map lookups will usually be avoided.
:- func new_breakpoints_filter = (bitmap::bitmap_uo) is det.
new_breakpoints_filter = bitmap.init(breakpoints_filter_mask + 1).
:- func breakpoints_filter_mask = int.
breakpoints_filter_mask = 0xffff.
:- func breakpoints_filter_hash(string) = int.
breakpoints_filter_hash(String) =
string_hash(String) /\ breakpoints_filter_mask.
:- pred generate_breakpoints_filter(breakpoints_map::in, bitmap::bitmap_uo)
is det.
generate_breakpoints_filter(BreakPoints, Bitmap) :-
map.foldl_values(set_breakpoints_filter_bits, BreakPoints,
new_breakpoints_filter, Bitmap).
:- pred set_breakpoints_filter_bits(breakpoint::in,
bitmap::bitmap_di, bitmap::bitmap_uo) is det.
set_breakpoints_filter_bits(BreakPoint, !Bitmap) :-
BreakPoint = breakpoint(_Num, ProcId, State),
(
State = bp_state_enabled,
ProcId = ssdb_proc_id(ModuleName, ProcName),
bitmap.set(breakpoints_filter_hash(ModuleName), !Bitmap),
bitmap.set(breakpoints_filter_hash(ProcName), !Bitmap)
;
State = bp_state_disabled
).
:- pred check_breakpoint(ssdb_proc_id::in, bool::out, io::di, io::uo) is det.
check_breakpoint(ProcId, Hit, !IO) :-
get_breakpoints_filter(Filter, !IO),
ProcId = ssdb_proc_id(ModuleName, ProcName),
( if
Filter ^ unsafe_bit(breakpoints_filter_hash(ProcName)) = yes,
Filter ^ unsafe_bit(breakpoints_filter_hash(ModuleName)) = yes
then
get_breakpoints_map(BreakPoints, !IO),
( if
map.search(BreakPoints, ProcId, BreakPoint),
BreakPoint ^ bp_state = bp_state_enabled
then
Hit = yes
else
Hit = no
)
else
Hit = no
).
:- func string_hash(string) = int.
string_hash(S) = string.hash(S).
:- pragma foreign_proc("Java",
string_hash(Str::in) = (Hash::out),
[will_not_call_mercury, promise_pure, thread_safe],
"
// Faster than the string.hash implementation.
Hash = Str.hashCode();
").
%----------------------------------------------------------------------------%
% Print the current information at this event point.
%
:- pred print_event_info(ssdb_event_type::in, int::in, io::di, io::uo) is det.
print_event_info(Event, EventNum, !IO) :-
stack_top(StackFrame, !IO),
CSN = StackFrame ^ sf_csn,
ProcId = StackFrame ^ sf_proc_id,
PrintDepth = StackFrame ^ sf_depth,
SiteFile = StackFrame ^ sf_call_site_file,
SiteLine = StackFrame ^ sf_call_site_line,
% Should right align these numbers.
io.write_string("\t", !IO),
io.write_int(EventNum, !IO),
io.write_string(":\t", !IO),
io.write_int(CSN, !IO),
io.write_string(" ", !IO),
io.write_int(PrintDepth, !IO),
io.write_string("\t", !IO),
(
( Event = ssdb_call
; Event = ssdb_call_nondet
),
io.write_string("CALL", !IO)
;
( Event = ssdb_exit
; Event = ssdb_exit_nondet
),
io.write_string("EXIT", !IO)
;
( Event = ssdb_fail
; Event = ssdb_fail_nondet
),
io.write_string("FAIL", !IO)
;
Event = ssdb_redo_nondet,
io.write_string("REDO", !IO)
;
Event = ssdb_excp,
io.write_string("EXCP", !IO)
),
io.write_string(" ", !IO),
% mdb writes pred/func here.
io.write_string(ProcId ^ module_name, !IO),
io.write_string(".", !IO),
io.write_string(ProcId ^ proc_name, !IO),
% mdb writes arity, mode, determinism and context here.
io.format(" (%s:%d)\n", [s(SiteFile), i(SiteLine)], !IO).
%-----------------------------------------------------------------------------%
:- pred print_depth_change(int::in, io::di, io::uo) is det.
print_depth_change(Depth, !IO) :-
io.format("Ancestor level set to %d:\n", [i(Depth)], !IO),
stack_index(Depth, StackFrame, !IO),
stack_depth(StackDepth, !IO),
print_frame_info(StackFrame, StackDepth, !IO).
% print_frame_info(Frame, StackDepth, !IO).
%
% Print the information of the frame gave in argument.
%
:- pred print_frame_info(stack_frame::in, int::in, io::di, io::uo) is det.
print_frame_info(StackFrame, StackDepth, !IO) :-
Depth = StackFrame ^ sf_depth,
ProcId = StackFrame ^ sf_proc_id,
ProcId = ssdb_proc_id(ModuleName, ProcName),
SiteFile = StackFrame ^ sf_call_site_file,
SiteLine = StackFrame ^ sf_call_site_line,
RevDepth = StackDepth - Depth,
io.format("%4d %s.%s (%s:%d)\n",
[i(RevDepth), s(ModuleName), s(ProcName), s(SiteFile), i(SiteLine)],
!IO).
%-----------------------------------------------------------------------------%
:- pred print_stack_trace(int::in, int::in, int::in, io::di, io::uo) is det.
print_stack_trace(CurLevel, StarDepth, RemainingLines, !IO) :-
stack_depth(StackDepth, !IO),
( if
RemainingLines = 0,
CurLevel < StackDepth - 1
then
io.write_string("<more stack frames snipped>\n", !IO)
else if
CurLevel < StackDepth
then
get_shadow_stack(Stack0, !IO),
list.det_drop(CurLevel, Stack0, Stack),
CurFrame = list.det_head(Stack),
compress_stack_frames(CurFrame, Stack, 0, SkippedFrames),
NextLevel = CurLevel + SkippedFrames,
( if
StarDepth >= CurLevel,
StarDepth < NextLevel
then
Star = ('*')
else
Star = (' ')
),
print_stack_frame(Star, CurLevel, CurFrame, SkippedFrames, !IO),
print_stack_trace(NextLevel, StarDepth, RemainingLines - 1, !IO)
else
true
).
:- pred compress_stack_frames(stack_frame::in, list(stack_frame)::in,
int::in, int::out) is det.
compress_stack_frames(RefFrame, Stack, Count0, Count) :-
(
Stack = [],
Count = Count0
;
Stack = [Frame | Frames],
( if RefFrame ^ sf_proc_id = Frame ^ sf_proc_id then
compress_stack_frames(RefFrame, Frames, Count0 + 1, Count)
else
Count = Count0
)
).
:- pred print_stack_frame(char::in, int::in, stack_frame::in, int::in,
io::di, io::uo) is det.
print_stack_frame(Star, Level, Frame, SkippedFrames, !IO) :-
Module = Frame ^ sf_proc_id ^ module_name,
Procedure = Frame ^ sf_proc_id ^ proc_name,
SiteFile = Frame ^ sf_call_site_file,
SiteLine = Frame ^ sf_call_site_line,
io.format("%c%4d ", [c(Star), i(Level)], !IO),
( if SkippedFrames > 1 then
io.format("%4d*", [i(SkippedFrames)], !IO),
Etc = " and others"
else
io.write_string(" ", !IO),
Etc = ""
),
io.format(" %s.%s (%s:%d%s)\n",
[s(Module), s(Procedure), s(SiteFile), i(SiteLine), s(Etc)], !IO).
%-----------------------------------------------------------------------------%
% Print the given list of variables and their values, if bound.
%
:- pred print_vars(maybe(portray_format)::in, browse_caller_type::in,
list(var_value)::in, io::di, io::uo) is det.
print_vars(MaybeFormat, CallerType, Vars, !IO) :-
list.foldl(print_var(MaybeFormat, CallerType), Vars, !IO).
:- pred print_var_with_name(maybe(portray_format)::in, list(var_value)::in,
string::in, io::di, io::uo) is det.
print_var_with_name(MaybeFormat, VarDescs, VarName, !IO) :-
( if
string.to_int(VarName, VarNum),
VarNum > 0
then
print_var_with_number(MaybeFormat, VarDescs, VarNum, !IO)
else
% Since we don't have tab completion, make it easier for the user by
% matching prefixes instead of the entire name.
P = (pred(VarDesc::in) is semidet :-
string.prefix(get_var_name(VarDesc), VarName)
),
list.filter(P, VarDescs, MatchVars),
(
MatchVars = [],
io.write_string("ssdb: there is no such variable.\n", !IO)
;
MatchVars = [_ | _],
print_vars(MaybeFormat, print, MatchVars, !IO)
)
).
:- pred print_var_with_number(maybe(portray_format)::in, list(var_value)::in,
int::in, io::di, io::uo) is det.
print_var_with_number(MaybeFormat, VarDescs, VarNum, !IO) :-
( if list.index1(VarDescs, VarNum, VarDesc) then
print_var(MaybeFormat, print, VarDesc, !IO)
else
io.write_string("ssdb: there aren't that many variables.\n", !IO)
).
:- pred print_var(maybe(portray_format)::in, browse_caller_type::in,
var_value::in, io::di, io::uo) is det.
print_var(MaybeFormat, CallerType, VarValue, !IO) :-
(
VarValue = unbound_head_var(Name, Pos),
print_var_prelude(Name, Pos, !IO),
io.write_string("_\n", !IO)
;
VarValue = bound_head_var(Name, Pos, T),
( if Pos >= 0 then
Prefix = string.format("\t%s (arg %d)\t", [s(Name), i(Pos + 1)])
else
Prefix = string.format("\t%s\t", [s(Name)])
),
safe_write(MaybeFormat, CallerType, Prefix, T, !IO)
;
VarValue = bound_other_var(Name, T),
Prefix = string.format("\t%s\t", [s(Name)]),
safe_write(MaybeFormat, CallerType, Prefix, T, !IO)
).
:- pred print_var_prelude(var_name::in, int::in, io::di, io::uo) is det.
print_var_prelude(Name, Pos, !IO) :-
io.write_char('\t', !IO),
io.write_string(Name, !IO),
( if Pos >= 0 then
io.write_string(" (arg ", !IO),
io.write_int(Pos + 1, !IO),
io.write_string(")\t", !IO)
else
io.write_string("\t", !IO)
).
:- pred safe_write(maybe(portray_format)::in, browse_caller_type::in,
string::in, T::in, io::di, io::uo) is det.
safe_write(MaybeFormat, CallerType, Prefix, T, !IO) :-
( if safe_to_write(T) then
io.write_string(Prefix, !IO),
type_to_univ(T, Univ),
print_browser_term(MaybeFormat, CallerType, plain_term(Univ), !IO)
else
io.write_string(Prefix, !IO),
io.write_string("(unsafe)\n", !IO)
).
:- pred safe_to_write(T::in) is semidet.
safe_to_write(_) :-
semidet_true.
:- pragma foreign_proc("C",
safe_to_write(T::in),
[will_not_call_mercury, promise_pure, thread_safe],
"
SUCCESS_INDICATOR = (T != 0);
").
:- pragma foreign_proc("Java",
safe_to_write(T::in),
[will_not_call_mercury, promise_pure, thread_safe],
"
SUCCESS_INDICATOR = (T != null);
").
:- pred print_browser_term(maybe(portray_format)::in, browse_caller_type::in,
browser_term::in, io::di, io::uo) is det.
print_browser_term(MaybeFormat, CallerType, Term, !IO) :-
io.output_stream(StdOut, !IO),
get_browser_state(State, !IO),
promise_equivalent_solutions [!:IO] (
(
MaybeFormat = yes(Format),
print_browser_term_format(StdOut, CallerType, Format, Term,
State, !IO)
;
MaybeFormat = no,
print_browser_term(StdOut, CallerType, Term, State, !IO)
)
).
:- func get_var_name(var_value) = string.
get_var_name(unbound_head_var(Name, _)) = Name.
get_var_name(bound_head_var(Name, _, _)) = Name.
get_var_name(bound_other_var(Name, _)) = Name.
%-----------------------------------------------------------------------------%
:- pred browse_var(list(var_value)::in, string::in, io::di, io::uo) is det.
browse_var(ListVarValue, VarName, !IO) :-
( if
string.to_int(VarName, VarNum),
VarNum > 0
then
( if list.index1(ListVarValue, VarNum, VarValue) then
(
VarValue = bound_head_var(_, _, Value),
type_to_univ(Value, Univ),
browse_term(plain_term(Univ), !IO)
;
VarValue = bound_other_var(_, Value),
type_to_univ(Value, Univ),
browse_term(plain_term(Univ), !IO)
;
VarValue = unbound_head_var(_, _),
io.write_string("ssdb: the variable is unbound.\n", !IO)
)
else
io.write_string("ssdb: there aren't that many variables.\n", !IO)
)
else if
list_var_value_to_assoc_list(ListVarValue, VarDescs),
assoc_list.search(VarDescs, VarName, Univ)
then
browse_term(plain_term(Univ), !IO)
else
io.write_string("ssdb: there is no such variable.\n", !IO)
).
:- pred browse_term(browser_term::in, io::di, io::uo) is det.
browse_term(Term, !IO) :-
io.input_stream(StdIn, !IO),
io.output_stream(StdOut, !IO),
get_browser_state(State0, !IO),
promise_equivalent_solutions [State, !:IO] (
browse.browse_browser_term_no_modes(StdIn, StdOut, Term, _,
State0, State, !IO)
),
set_browser_state(State, !IO).
%-----------------------------------------------------------------------------%
% Transform the list(var_value) into a assoc_list. As it is for the browser
% use, only the bound variable are put into the assoc_list structure.
%
:- pred list_var_value_to_assoc_list(list(var_value)::in,
assoc_list(string, univ)::out) is det.
list_var_value_to_assoc_list([], []).
list_var_value_to_assoc_list([VarValue | VarValues], AssocListVarValue) :-
(
VarValue = unbound_head_var(_Name, _Pos),
list_var_value_to_assoc_list(VarValues, AssocListVarValue)
;
VarValue = bound_head_var(Name, _Pos, Value),
type_to_univ(Value, ValueUniv),
list_var_value_to_assoc_list(VarValues, AssocListVarValue0),
AssocListVarValue = [pair(Name, ValueUniv) | AssocListVarValue0]
;
VarValue = bound_other_var(Name, Value),
type_to_univ(Value, ValueUniv),
list_var_value_to_assoc_list(VarValues, AssocListVarValue0),
AssocListVarValue = [pair(Name, ValueUniv) | AssocListVarValue0]
).
%-----------------------------------------------------------------------------%
:- pred print_vars_list(list(var_value)::in, int::in, io::di, io::uo) is det.
print_vars_list([], _, !IO).
print_vars_list([Var | Vars], VarNum, !IO) :-
io.format("\t%2d ", [i(VarNum)], !IO),
( Var = unbound_head_var(Name, Pos)
; Var = bound_head_var(Name, Pos, _)
; Var = bound_other_var(Name, _), Pos = -1
),
io.write_string(Name, !IO),
( if Pos >= 0 then
io.format(" (arg %d)\n", [i(Pos + 1)], !IO)
else
io.nl(!IO)
),
print_vars_list(Vars, VarNum + 1, !IO).
%-----------------------------------------------------------------------------%
% Print the current list of breakpoints with their details.
%
:- pred print_breakpoints(breakpoints_map::in, io::di, io::uo) is det.
print_breakpoints(BreakPoints, !IO) :-
( if map.is_empty(BreakPoints) then
io.write_string("There are no break points.\n", !IO)
else
% This relies on the integer id being the first field.
list.sort(map.values(BreakPoints), SortedBreakPoints),
list.foldl(print_breakpoint, SortedBreakPoints, !IO)
).
:- pred print_breakpoint(breakpoint::in, io::di, io::uo) is det.
print_breakpoint(BreakPoint, !IO) :-
BreakPoint = breakpoint(Num, ProcId, State),
ProcId = ssdb_proc_id(ModuleName, PredName),
(
State = bp_state_enabled,
Enabled = "+"
;
State = bp_state_disabled,
Enabled = "-"
),
io.format("%2d: %s %s.%s\n",
[i(Num), s(Enabled), s(ModuleName), s(PredName)], !IO).
%-----------------------------------------------------------------------------%
% Print a summary of the commands.
%
:- pred print_help(io::di, io::uo) is det.
print_help(!IO) :-
Lines = [
"Supported commands: (type `alias' to show aliases)",
"step [NUM]",
"next",
"goto NUM",
"continue",
"exception",
"retry [NUM]",
"print [-fprv]",
"print [-fprv] VAR|NUM",
"print [-fprv] *",
"browse VAR|NUM",
"vars",
"stack [NUM]",
"up [NUM]",
"down [NUM]",
"level NUM",
"current",
"format [-APB] flat|raw_pretty|pretty|verbose",
"format_param [-APBfpv] depth|size|width|lines NUM",
"alias [NAME]",
"alias NAME COMMAND [COMMAND-PARAMETER ...]",
"unalias NAME",
"list [NUM]",
"list_path [DIR ...]",
"push_list_dir DIR ...",
"pop_list_dir",
"break MODULE.PRED",
"break info",
"enable NUM|*",
"disable NUM|*",
"delete NUM|*",
"help",
"source FILENAME",
"quit [-y]"
],
io.write_list(Lines, "\n", io.write_string, !IO),
io.write_string("\n\n", !IO).
%-----------------------------------------------------------------------------%
:- pred process_options(pred(string, T, T)::in(pred(in, in, out) is semidet),
list(string)::in, list(string)::out, T::in, io.res(T)::out) is det.
process_options(Handler, Args0, Args, Data0, Res) :-
(
Args0 = [],
Args = [],
Res = ok(Data0)
;
Args0 = [First | Rest],
( if string.prefix(First, "--") then
( if Handler(First, Data0, Data1) then
process_options(Handler, Rest, Args, Data1, Res)
else
Message = "unrecognised option `" ++ First ++ "'",
Res = error(io.make_io_error(Message)),
Args = Args0
)
else if
string.prefix(First, "-"),
string.to_char_list(First, [_ | FirstChars]),
FirstChars = [_ | _]
then
process_short_options(Handler, FirstChars, Data0, Res1),
(
Res1 = ok(Data1),
process_options(Handler, Rest, Args, Data1, Res)
;
Res1 = error(_),
Res = Res1,
Args = Args0
)
else
process_options(Handler, Rest, Rest1, Data0, Res),
Args = [First | Rest1]
)
).
:- pred process_short_options(
pred(string, T, T)::in(pred(in, in, out) is semidet), list(char)::in,
T::in, io.res(T)::out) is det.
process_short_options(Handler, Chars, Data0, Res) :-
(
Chars = [],
Res = ok(Data0)
;
Chars = [C | Cs],
Option = string.from_char_list(['-', C]),
( if Handler(Option, Data0, Data1) then
process_short_options(Handler, Cs, Data1, Res)
else
Message = "unrecognised option `" ++ Option ++ "'",
Res = error(io.make_io_error(Message))
)
).
%-----------------------------------------------------------------------------%
:- pred print_expect_argument(io::di, io::uo) is det.
print_expect_argument(!IO) :-
io.write_string("ssdb: command requires argument.\n", !IO).
:- pred print_expect_integer(io::di, io::uo) is det.
print_expect_integer(!IO) :-
io.write_string("ssdb: command requires integer argument.\n", !IO).
:- pred print_too_many_arguments(io::di, io::uo) is det.
print_too_many_arguments(!IO) :-
io.write_string("ssdb: too many arguments to command.\n", !IO).
:- pred print_invalid_argument(io::di, io::uo) is det.
print_invalid_argument(!IO) :-
io.write_string("ssdb: invalid argument to command.\n", !IO).
%----------------------------------------------------------------------------%
:- impure pred invent_io(io::uo) is det.
:- pragma inline(pred(invent_io/1)).
invent_io(IO) :-
private_builtin.unsafe_type_cast(0, IO0),
unsafe_promise_unique(IO0, IO),
impure impure_true.
:- impure pred consume_io(io::di) is det.
:- pragma inline(pred(consume_io/1)).
consume_io(_) :-
impure impure_true.
%-----------------------------------------------------------------------------%
:- pred save_streams(io::di, io::uo) is det.
save_streams(!IO) :-
get_tty_in(TTY_in, !IO),
get_tty_out(TTY_out, !IO),
io.set_input_stream(TTY_in, OldInputStream, !IO),
io.set_output_stream(TTY_out, OldOutputStream, !IO),
set_saved_input_stream(OldInputStream, !IO),
set_saved_output_stream(OldOutputStream, !IO).
:- pred restore_streams(io::di, io::uo) is det.
restore_streams(!IO) :-
get_saved_input_stream(InputStream, !IO),
get_saved_output_stream(OutputStream, !IO),
io.set_input_stream(InputStream, _, !IO),
io.set_output_stream(OutputStream, _, !IO).
%-----------------------------------------------------------------------------%
:- pred exit_process(io::di, io::uo) is det.
:- pragma foreign_proc("C",
exit_process(_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io],
"
exit(0);
").
:- pragma foreign_proc("C#",
exit_process(_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io],
"
System.Environment.Exit(0);
").
:- pragma foreign_proc("Java",
exit_process(_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io],
"
System.exit(0);
").
%-----------------------------------------------------------------------------%
:- pred nonnegative_int(string::in, int::out) is semidet.
nonnegative_int(S, N) :-
string.to_int(S, N),
N >= 0.
%-----------------------------------------------------------------------------%
pause_debugging(Paused, !IO) :-
get_debugger_state_safer(PausedOnOrOff, !IO),
(
PausedOnOrOff = debugger_off
;
PausedOnOrOff = debugger_on,
set_debugger_state(debugger_off, !IO)
),
Paused = debugging_paused(PausedOnOrOff).
resume_debugging(Paused, !IO) :-
Paused = debugging_paused(PausedOnOrOff),
(
PausedOnOrOff = debugger_on,
set_debugger_state(debugger_on, !IO)
;
PausedOnOrOff = debugger_off
).
enable_debugging(!IO) :-
set_debugger_state(debugger_on, !IO).
%----------------------------------------------------------------------------%
%----------------------------------------------------------------------------%
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