303 lines
9.8 KiB
Text
303 lines
9.8 KiB
Text
namespace debugger
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inductive mode
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| init | step | run | done
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instance : decidable_eq mode :=
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by tactic.mk_dec_eq_instance
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structure state :=
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(md : mode)
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(csz : nat)
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(fn_bps : list name)
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(active_bps : list (nat × name))
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def init_state : state :=
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{ md := mode.init, csz := 0,
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fn_bps := [], active_bps := [] }
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def is_space (c : char) : bool :=
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if c = ' ' ∨ c = char.of_nat 11 ∨ c = '\n' then tt else ff
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def split_core : string → string → list string
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| (c::cs) [] :=
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if is_space c then split_core cs [] else split_core cs [c]
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| (c::cs) r :=
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if is_space c then r^.reverse :: split_core cs [] else split_core cs (c::r)
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| [] [] := []
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| [] r := [r^.reverse]
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def split (s : string) : list string :=
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(split_core s [])^.reverse
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def to_qualified_name_core : string → string → name
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| [] r := if r = [] then name.anonymous else mk_simple_name r^.reverse
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| (c::cs) r :=
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if is_space c then to_qualified_name_core cs r
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else if c = '.' then
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if r = [] then to_qualified_name_core cs []
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else name.mk_string r^.reverse (to_qualified_name_core cs [])
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else to_qualified_name_core cs (c::r)
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def to_qualified_name (s : string) : name :=
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to_qualified_name_core s []
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meta def get_file (fn : name) : vm string :=
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do {
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d ← vm.get_decl fn,
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some n ← return (vm_decl.olean d) | failure,
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return n
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}
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<|>
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return "[current file]"
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meta def pos_info (fn : name) : vm string :=
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do {
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d ← vm.get_decl fn,
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some (line, col) ← return (vm_decl.pos d) | failure,
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file ← get_file fn,
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return (file ++ ":" ++ line^.to_string ++ ":" ++ col^.to_string)
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}
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<|>
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return "<position not available>"
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meta def display_fn (header : string) (fn : name) (frame : nat) : vm unit :=
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do pos ← pos_info fn,
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vm.put_str ("[" ++ frame^.to_string ++ "] " ++ header ++ " " ++ fn^.to_string ++ " at " ++ pos ++ "\n")
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meta def display_curr_fn (header : string) : vm unit :=
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do fn ← vm.curr_fn,
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sz ← vm.call_stack_size,
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display_fn header fn (sz-1)
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meta def display_help : vm unit :=
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do
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vm.put_str "exit - stop debugger\n",
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vm.put_str "help - display this message\n",
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vm.put_str "run - continue execution\n",
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vm.put_str "step - execute until another function in on the top of the stack\n",
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vm.put_str "stack trace\n",
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vm.put_str " up - move up in the stack trace\n",
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vm.put_str " down - move down in the stack trace\n",
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vm.put_str " vars - display variables in the current stack frame\n",
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vm.put_str "breakpoints\n",
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vm.put_str " break fn - add breakpoint for fn\n",
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vm.put_str " rbreak fn - remove breakpoint\n",
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vm.put_str " bs - show breakpoints\n"
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meta def is_valid_fn_prefix (p : name) : vm bool :=
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do env ← vm.get_env,
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return $ env^.fold ff (λ d r,
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r ||
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let n := d^.to_name in
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p^.is_prefix_of n)
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meta def add_breakpoint (s : state) (args : list string) : vm state :=
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match args with
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| [arg] := do
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fn ← return $ to_qualified_name arg,
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ok ← is_valid_fn_prefix fn,
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if ok then
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return {s with fn_bps := fn :: list.filter (λ fn', fn ≠ fn') s^.fn_bps}
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else
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vm.put_str "invalid 'break' command, given name is not the prefix for any function\n" >>
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return s
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| _ :=
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vm.put_str "invalid 'break <fn>' command, incorrect number of arguments\n" >>
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return s
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end
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meta def remove_breakpoint (s : state) (args : list string) : vm state :=
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match args with
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| [arg] := do
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fn ← return $ to_qualified_name arg,
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return {s with fn_bps := list.filter (λ fn', fn ≠ fn') s^.fn_bps}
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| _ :=
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vm.put_str "invalid 'rbreak <fn>' command, incorrect number of arguments\n" >>
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return s
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end
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meta def show_breakpoints : list name → vm unit
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| [] := return ()
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| (fn::fns) := do
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vm.put_str " ",
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vm.put_str fn^.to_string,
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vm.put_str "\n",
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show_breakpoints fns
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meta def show_frame (frame : nat) : vm unit :=
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do sz ← vm.call_stack_size,
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fn ← if frame >= sz then vm.curr_fn else vm.call_stack_fn frame,
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display_fn "frame" fn frame
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meta def up (frame : nat) : vm nat :=
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if frame = 0 then return 0
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else show_frame (frame - 1) >> return (frame - 1)
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meta def down (frame : nat) : vm nat :=
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do sz ← vm.call_stack_size,
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if frame >= sz - 1 then return frame
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else show_frame (frame + 1) >> return (frame + 1)
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meta def type_to_string : option expr → nat → vm string
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| none i := do
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o ← vm.stack_obj i,
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match o^.kind with
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| vm_obj_kind.simple := return "[tagged value]"
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| vm_obj_kind.constructor := return "[constructor]"
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| vm_obj_kind.closure := return "[closure]"
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| vm_obj_kind.mpz := return "[big num]"
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| vm_obj_kind.name := return "name"
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| vm_obj_kind.level := return "level"
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| vm_obj_kind.expr := return "expr"
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| vm_obj_kind.declaration := return "declaration"
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| vm_obj_kind.environment := return "environment"
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| vm_obj_kind.tactic_state := return "tactic_state"
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| vm_obj_kind.format := return "format"
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| vm_obj_kind.options := return "options"
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| vm_obj_kind.other := return "[other]"
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end
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| (some type) i := do
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fmt ← vm.pp_expr type,
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opts ← vm.get_options,
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return (fmt^.to_string opts)
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meta def show_vars_core : nat → nat → nat → vm unit
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| c i e :=
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if i = e then return ()
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else do
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(n, type) ← vm.stack_obj_info i,
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type_str ← type_to_string type i,
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vm.put_str $ "#" ++ c^.to_string ++ " " ++ n^.to_string ++ " : " ++ type_str ++ "\n",
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show_vars_core (c+1) (i+1) e
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meta def show_vars (frame : nat) : vm unit :=
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do (s, e) ← vm.call_stack_var_range frame,
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show_vars_core 0 s e
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meta def cmd_loop_core : state → nat → list string → vm state
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| s frame default_cmd := do
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is_eof ← vm.eof,
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if is_eof then do
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vm.put_str "stopping debugger... 'end of file' has been found\n",
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return {s with md := mode.done }
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else do
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vm.put_str "% ",
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l ← vm.get_line,
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tks ← return $ split l,
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tks ← return $ if tks = [] then default_cmd else tks,
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match tks with
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| [] := cmd_loop_core s frame default_cmd
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| (cmd::args) :=
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if cmd = "help" then display_help >> cmd_loop_core s frame default_cmd
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else if cmd = "exit" then return {s with md := mode.done }
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else if cmd = "run" ∨ cmd = "r" then return {s with md := mode.run }
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else if cmd = "step" ∨ cmd = "s" then return {s with md := mode.step }
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else if cmd = "break" ∨ cmd = "b" then do new_s ← add_breakpoint s args, cmd_loop_core new_s frame default_cmd
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else if cmd = "rbreak" then do new_s ← remove_breakpoint s args, cmd_loop_core new_s frame default_cmd
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else if cmd = "bs" then do
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vm.put_str "breakpoints\n",
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show_breakpoints s^.fn_bps,
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cmd_loop_core s frame default_cmd
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else if cmd = "up" ∨ cmd = "u" then do frame ← up frame, cmd_loop_core s frame ["u"]
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else if cmd = "down" ∨ cmd = "d" then do frame ← down frame, cmd_loop_core s frame ["d"]
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else if cmd = "vars" ∨ cmd = "v" then do show_vars frame, cmd_loop_core s frame ["vars"]
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else do vm.put_str "unknown command, type 'help' for help\n", cmd_loop_core s frame default_cmd
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end
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meta def cmd_loop (s : state) (default_cmd : list string) : vm state :=
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do csz ← vm.call_stack_size,
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cmd_loop_core s (csz - 1) default_cmd
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def prune_active_bps_core (csz : nat) : list (nat × name) → list (nat × name)
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| [] := []
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| ((csz', n)::ls) := if csz < csz' then prune_active_bps_core ls else ((csz',n)::ls)
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meta def prune_active_bps (s : state) : vm state :=
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do sz ← vm.call_stack_size,
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return {s with active_bps := prune_active_bps_core sz s^.active_bps}
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meta def updt_csz (s : state) : vm state :=
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do sz ← vm.call_stack_size,
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return {s with csz := sz}
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meta def init_transition (s : state) : vm state :=
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do opts ← vm.get_options,
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if opts^.get_bool `server ff then return {s with md := mode.done}
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else do
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bps ← vm.get_attribute `breakpoint,
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new_s ← return {s with fn_bps := bps},
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if opts^.get_bool `debugger.autorun ff then
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return {new_s with md := mode.run}
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else do
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vm.put_str "Lean debugger\n",
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display_curr_fn "debugging",
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vm.put_str "type 'help' for help\n",
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cmd_loop new_s []
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meta def step_transition (s : state) : vm state :=
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do
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sz ← vm.call_stack_size,
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if sz = s^.csz then return s
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else do
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display_curr_fn "step",
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cmd_loop s ["s"]
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meta def bp_reached (s : state) : vm bool :=
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do fn ← vm.curr_fn,
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return $ s^.fn_bps^.any (λ p, p^.is_prefix_of fn)
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meta def in_active_bps (s : state) : vm bool :=
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do sz ← vm.call_stack_size,
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match s^.active_bps with
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| [] := return ff
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| (csz, _)::_ := return $ to_bool (sz = csz)
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end
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meta def run_transition (s : state) : vm state :=
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do b1 ← in_active_bps s,
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b2 ← bp_reached s,
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if b1 ∨ not b2 then return s
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else do
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display_curr_fn "breakpoint",
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fn ← vm.curr_fn,
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sz ← vm.call_stack_size,
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new_s ← return $ {s with active_bps := (sz, fn) :: s^.active_bps},
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cmd_loop new_s ["r"]
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meta def step_fn (s : state) : vm state :=
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do s ← prune_active_bps s,
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if s^.md = mode.init then do new_s ← init_transition s, updt_csz new_s
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else if s^.md = mode.done then return s
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else if s^.md = mode.step then do new_s ← step_transition s, updt_csz new_s
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else if s^.md = mode.run then do new_s ← run_transition s, updt_csz new_s
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else return s
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meta def monitor : vm_monitor state :=
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{ init := init_state, step := step_fn }
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def attr : user_attribute :=
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{ name := `breakpoint,
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descr := "breakpoint for debugger" }
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end debugger
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run_command vm_monitor.register `debugger.monitor
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run_command attribute.register `debugger.attr
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set_option debugger true
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set_option debugger.autorun true
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def g (c : nat) := c + 1
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def h (a : nat) (b : nat) := g b + a
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def s (a : nat) := h 2 a + h 3 a
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local attribute [breakpoint] h
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def f : nat → nat
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| 0 := s 0
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| (a+1) := f a
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vm_eval f 3
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