/usr/local/lib/swipl/library/prolog_debug.pl
All Application Manual Name SummaryHelp

  • swipl
    • library
      • error.pl
      • debug.pl
      • apply.pl
      • lists.pl
      • broadcast.pl
      • shlib.pl
      • option.pl
      • thread_pool.pl
      • gensym.pl
      • settings.pl
      • arithmetic.pl
      • main.pl
      • readutil.pl -- Read utilities
      • operators.pl
      • pairs.pl -- Operations on key-value lists
      • prolog_source.pl
      • record.pl
      • quasi_quotations.pl -- Define Quasi Quotation syntax
      • pure_input.pl -- Pure Input from files and streams
      • solution_sequences.pl -- Modify solution sequences
      • ordsets.pl -- Ordered set manipulation
      • random.pl
      • base64.pl -- Base64 encoding and decoding
      • aggregate.pl -- Aggregation operators on backtrackable predicates
      • yall.pl
      • sandbox.pl
      • apply_macros.pl -- Goal expansion rules to avoid meta-calling
      • assoc.pl -- Binary associations
      • prolog_format.pl -- Analyse format specifications
      • predicate_options.pl
      • csv.pl
      • pprint.pl -- Pretty Print Prolog terms
      • atom.pl
      • modules.pl
      • occurs.pl
      • prolog_xref.pl
      • prolog_colour.pl
      • lazy_lists.pl
      • ugraphs.pl
      • url.pl -- Analysing and constructing URL
      • www_browser.pl
      • prolog_pack.pl
      • git.pl
      • utf8.pl
      • dialect.pl
      • system.pl
      • terms.pl
      • date.pl
      • persistency.pl -- Provide persistent dynamic predicates
      • iostream.pl -- Utilities to deal with streams
      • prolog_stack.pl -- Examine the Prolog stack
      • edinburgh.pl -- Some traditional Edinburgh predicates
      • prolog_clause.pl
      • prolog_breakpoints.pl -- Manage Prolog break-points
      • wfs.pl
      • prolog_code.pl
      • sort.pl
      • dicts.pl
      • dif.pl
      • varnumbers.pl
      • pio.pl
      • backcomp.pl -- Backward compatibility
      • base32.pl
      • charsio.pl
      • codesio.pl -- I/O on Lists of Character Codes
      • coinduction.pl
      • heaps.pl
      • rbtrees.pl
      • statistics.pl
      • when.pl
      • ansi_term.pl -- Print decorated text to ANSI consoles
      • prolog_versions.pl -- Demand specific (Prolog) versions
      • help.pl
      • listing.pl -- List programs and pretty print clauses
      • thread.pl -- High level thread primitives
      • nb_set.pl
      • threadutil.pl -- Interactive thread utilities
      • check.pl
      • prolog_codewalk.pl -- Prolog code walker
      • make.pl
      • writef.pl -- Old-style formatted write
      • edit.pl
      • prolog_profile.pl -- Execution profiler
      • optparse.pl
      • macros.pl
      • ctypes.pl -- Character code classification
      • zip.pl
      • tty.pl
      • intercept.pl
      • tables.pl
      • prolog_history.pl -- Per-directory persistent commandline history
      • prolog_config.pl -- Provide configuration information
      • quintus.pl
      • prolog_autoload.pl
      • prolog_jiti.pl
      • shell.pl
      • prolog_coverage.pl
      • hashtable.pl -- Hash tables
      • prolog_trace.pl
      • prolog_wrap.pl -- Wrapping predicates
      • explain.pl
      • exceptions.pl
      • files.pl
      • prolog_debug.pl -- User level debugging tools
        • debug_control_hook/1
        • spy/1
        • nospy/1
        • nospyall/0
        • debugging/0
        • debugging_hook/1
        • trap/1
        • notrap/1
        • trap_alias/2
        • exception_hook/5
      • rwlocks.pl
      • increval.pl
      • strings.pl -- String utilities
      • streams.pl -- Manage Prolog streams
      • portray_text.pl
      • oset.pl
      • prolog_metainference.pl
      • fastrw.pl
 spy(:Spec) is det
 nospy(:Spec) is det
 nospyall is det
Set/clear spy-points. A successfully set or cleared spy-point is reported using print_message/2, level informational, with one of the following terms, where Spec is of the form M:Head.
  • spy(Spec)
  • nospy(Spec)
See also
- spy/1 and nospy/1 call the hook prolog:debug_control_hook/1 to allow for alternative specifications of the thing to debug.