/usr/local/lib/swipl/library/prolog_breakpoints.pl
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  • swipl
    • library
      • error.pl
      • debug.pl -- Print debug messages and test assertions
      • apply.pl -- Apply predicates on a list
      • lists.pl -- List Manipulation
      • broadcast.pl -- Event service
      • shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
      • option.pl -- Option list processing
      • thread_pool.pl -- Resource bounded thread management
      • gensym.pl -- Generate unique symbols
      • settings.pl -- Setting management
      • arithmetic.pl -- Extensible arithmetic
      • main.pl -- Provide entry point for scripts
      • readutil.pl -- Read utilities
      • operators.pl -- Manage operators
      • 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 -- Random numbers
      • base64.pl -- Base64 encoding and decoding
      • aggregate.pl -- Aggregation operators on backtrackable predicates
      • yall.pl -- Lambda expressions
      • sandbox.pl -- Sandboxed Prolog code
      • apply_macros.pl -- Goal expansion rules to avoid meta-calling
      • assoc.pl -- Binary associations
      • prolog_format.pl
      • predicate_options.pl -- Access and analyse predicate options
      • csv.pl
      • pprint.pl -- Pretty Print Prolog terms
      • atom.pl
      • modules.pl -- Module utility predicates
      • occurs.pl -- Finding and counting sub-terms
      • prolog_xref.pl
      • prolog_colour.pl -- Prolog syntax colouring support.
      • lazy_lists.pl -- Lazy list handling
      • ugraphs.pl -- Graph manipulation library
      • url.pl -- Analysing and constructing URL
      • www_browser.pl -- Open a URL in the users browser
      • prolog_pack.pl -- A package manager for Prolog
      • git.pl
      • rbtrees.pl
      • dif.pl
      • charsio.pl -- I/O on Lists of Character Codes
      • prolog_stack.pl -- Examine the Prolog stack
      • edinburgh.pl -- Some traditional Edinburgh predicates
      • prolog_clause.pl
      • prolog_breakpoints.pl -- Manage Prolog break-points
        • set_breakpoint/4
        • set_breakpoint/5
        • delete_breakpoint/1
        • breakpoint_property/2
        • set_breakpoint_condition/2
      • wfs.pl -- Well Founded Semantics interface
      • dialect.pl -- Support multiple Prolog dialects
      • prolog_code.pl -- Utilities for reasoning about code
      • sort.pl
      • iostream.pl -- Utilities to deal with streams
      • dicts.pl -- Dict utilities
      • varnumbers.pl -- Utilities for numbered terms
      • intercept.pl -- Intercept and signal interface
      • listing.pl -- List programs and pretty print clauses
      • statistics.pl -- Get information about resource usage
      • terms.pl -- Term manipulation
      • base32.pl -- Base32 encoding and decoding
      • codesio.pl
      • coinduction.pl -- Co-Logic Programming
      • date.pl -- Process dates and times
      • heaps.pl -- heaps/priority queues
      • utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
      • when.pl -- Conditional coroutining
      • backcomp.pl -- Backward compatibility
      • writef.pl -- Old-style formatted write
      • zip.pl -- Access resource ZIP archives
      • prolog_autoload.pl -- Autoload all dependencies
      • check.pl -- Consistency checking
      • strings.pl -- String utilities
      • ctypes.pl -- Character code classification
      • quintus.pl -- Quintus compatibility
      • prolog_codewalk.pl -- Prolog code walker
      • help.pl
      • oset.pl
      • ansi_term.pl -- Print decorated text to ANSI consoles
      • thread.pl -- High level thread primitives
      • shell.pl
      • threadutil.pl -- Interactive thread utilities
      • increval.pl
      • tables.pl -- XSB interface to tables
      • prolog_profile.pl
      • prolog_coverage.pl -- Coverage analysis tool
      • system.pl -- System utilities
      • explain.pl
      • hashtable.pl
      • portray_text.pl -- Portray text
      • persistency.pl -- Provide persistent dynamic predicates
      • files.pl
      • prolog_metainference.pl -- Infer meta-predicate properties
      • nb_set.pl -- Non-backtrackable sets
      • exceptions.pl
      • prolog_trace.pl
      • prolog_wrap.pl -- Wrapping predicates
      • prolog_debug.pl -- User level debugging tools
      • streams.pl -- Manage Prolog streams
      • optparse.pl -- command line parsing
      • make.pl -- Reload modified source files
      • fastrw.pl
      • prolog_versions.pl
 set_breakpoint(+File, +Line, +Char, -Id) is det
 set_breakpoint(+Owner, +File, +Line, +Char, -Id) is det
Put a breakpoint at the indicated source-location. File is a current sourcefile (as reported by source_file/1). Line is the 1-based line in which Char is. Char is the position of the break.

First, '$clause_from_source'/4 uses the SWI-Prolog clause-source information to find the last clause starting before Line. '$break_pc' generates (on backtracking), a list of possible breakpoints.

Note that in addition to setting the breakpoint, the system must be in debug mode for the breakpoint to take effect. With threading enabled, there are various different ways this may be done. See debug/0, tdebug/0 and tdebug/1. Therefore, this predicate does not enable debug mode.

Arguments:
Owner- denotes the file that owns the clause. set_breakpoint/5 is used to set breakpoints in an included file in the context of the Owner main file. See source_file_property/2.