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

  • swipl
    • library
      • error.pl -- Error generating support
      • debug.pl -- Print debug messages and test assertions
      • apply.pl -- Apply predicates on a list
      • lists.pl -- List Manipulation
      • broadcast.pl -- Event service
      • predicate_options.pl -- Access and analyse predicate options
      • shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
      • option.pl -- Option list processing
      • thread_pool.pl
      • 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 -- Examine Prolog source-files
      • record.pl -- Access compound arguments by name
      • 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 -- Analyse format specifications
      • csv.pl -- Process CSV (Comma-Separated Values) data
      • pprint.pl -- Pretty Print Prolog terms
      • atom.pl -- Operations on atoms
      • modules.pl -- Module utility predicates
      • occurs.pl -- Finding and counting sub-terms
      • prolog_xref.pl -- Prolog cross-referencer data collection
      • prolog_colour.pl -- Prolog syntax colouring support.
      • lazy_lists.pl -- Lazy list handling
      • ugraphs.pl -- Graph manipulation library
      • iostream.pl -- Utilities to deal with streams
      • 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 -- Run GIT commands
      • rbtrees.pl -- Red black trees
      • dif.pl -- The dif/2 constraint
      • 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 -- Get detailed source-information about a clause
      • 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
      • dicts.pl -- Dict utilities
      • varnumbers.pl -- Utilities for numbered terms
      • base32.pl -- Base32 encoding and decoding
      • codesio.pl -- I/O on Lists of Character Codes
      • coinduction.pl -- Co-Logic Programming
      • date.pl -- Process dates and times
      • heaps.pl -- heaps/priority queues
      • statistics.pl -- Get information about resource usage
      • terms.pl -- Term manipulation
      • when.pl -- Conditional coroutining
      • backcomp.pl -- Backward compatibility
      • persistency.pl -- Provide persistent dynamic predicates
      • check.pl -- Consistency checking
      • strings.pl -- String utilities
      • prolog_debug.pl -- User level debugging tools
      • optparse.pl -- command line parsing
      • system.pl -- System utilities
      • quintus.pl -- Quintus compatibility
      • threadutil.pl -- Interactive thread utilities
      • listing.pl -- List programs and pretty print clauses
      • ctypes.pl -- Character code classification
      • increval.pl -- Incremental dynamic predicate modification
      • tables.pl -- XSB interface to tables
      • prolog_metainference.pl -- Infer meta-predicate properties
      • prolog_codewalk.pl -- Prolog code walker
      • oset.pl -- Ordered set manipulation
      • ansi_term.pl -- Print decorated text to ANSI consoles
      • prolog_coverage.pl -- Coverage analysis tool
      • prolog_wrap.pl -- Wrapping predicates
      • prolog_trace.pl -- Print access to predicates
      • thread.pl -- High level thread primitives
      • help.pl -- Text based manual
 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.