- 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
- 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
- quasi_quotations.pl -- Define Quasi Quotation syntax
- url.pl -- Analysing and constructing URL
- www_browser.pl -- Open a URL in the users browser
- prolog_colour.pl -- Prolog syntax colouring support.
- record.pl -- Access compound arguments by name
- prolog_xref.pl -- Prolog cross-referencer data collection
- occurs.pl -- Finding and counting sub-terms
- ordsets.pl -- Ordered set manipulation
- assoc.pl -- Binary associations
- ugraphs.pl -- Graph manipulation library
- iostream.pl -- Utilities to deal with streams
- atom.pl -- Operations on atoms
- prolog_pack.pl -- A package manager for Prolog
- solution_sequences.pl -- Modify solution sequences
- git.pl -- Run GIT commands
- ctypes.pl -- Character code classification
- utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
- base64.pl -- Base64 encoding and decoding
- persistency.pl -- Provide persistent dynamic predicates
- pure_input.pl -- Pure Input from files and streams
- nb_set.pl -- Non-backtrackable sets
- aggregate.pl -- Aggregation operators on backtrackable predicates
- csv.pl -- Process CSV (Comma-Separated Values) data
- dialect.pl -- Support multiple Prolog dialects
- apply_macros.pl -- Goal expansion rules to avoid meta-calling
- yall.pl -- Lambda expressions
- prolog_code.pl -- Utilities for reasoning about code
- dif.pl -- The dif/2 constraint
- thread.pl -- High level thread primitives
- rbtrees.pl -- Red black trees
- nb_rbtrees.pl -- Non-backtrackable operations on red black trees
- random.pl -- Random numbers
- sandbox.pl -- Sandboxed Prolog code
- prolog_format.pl -- Analyse format specifications
- pprint.pl -- Pretty Print Prolog terms
- modules.pl -- Module utility predicates
- lazy_lists.pl -- Lazy list handling
- edinburgh.pl -- Some traditional Edinburgh predicates
- prolog_clause.pl -- Get detailed source-information about a clause
- prolog_breakpoints.pl -- Manage Prolog break-points
- dicts.pl -- Dict utilities
- portray_text.pl -- Portray text
- optparse.pl -- command line parsing
- charsio.pl -- I/O on Lists of Character Codes
- strings.pl -- String utilities
- backcomp.pl -- Backward compatibility
- prolog_versions.pl -- Demand specific (Prolog) versions
- check.pl -- Consistency checking
- system.pl -- System utilities
- macros.pl -- Macro expansion
- terms.pl -- Term manipulation
- rwlocks.pl -- Read/write locks
- prolog_profile.pl -- Execution profiler
- prolog_coverage.pl -- Coverage analysis tool
- sort.pl
- listing.pl -- List programs and pretty print clauses
- help.pl -- Text based manual
- threadutil.pl -- Interactive thread utilities
- make.pl -- Reload modified source files
- shell.pl -- Elementary shell commands
- prolog_config.pl -- Provide configuration information
- prolog_jiti.pl -- Just In Time Indexing (JITI) utilities
- prolog_trace.pl -- Print access to predicates
- prolog_stack.pl -- Examine the Prolog stack
- heaps.pl -- heaps/priority queues
- statistics.pl -- Get information about resource usage
- prolog_debug.pl -- User level debugging tools
- quintus.pl -- Quintus compatibility
- intercept.pl -- Intercept and signal interface
- tables.pl -- XSB interface to tables
- prolog_codewalk.pl -- Prolog code walker
- increval.pl -- Incremental dynamic predicate modification
- files.pl
- prolog_autoload.pl -- Autoload all dependencies
- hashtable.pl -- Hash tables
- base32.pl -- Base32 encoding and decoding
- ansi_term.pl -- Print decorated text to ANSI consoles
- zip.pl -- Access resource ZIP archives
- date.pl -- Process dates and times
- oset.pl -- Ordered set manipulation
- fastrw.pl -- Fast reading and writing of terms
- qsave.pl -- Save current program as a state or executable
- prolog_wrap.pl -- Wrapping predicates
- edit.pl -- Editor interface
- codesio.pl -- I/O on Lists of Character Codes
- wfs.pl -- Well Founded Semantics interface
- writef.pl -- Old-style formatted write
- prolog_metainference.pl -- Infer meta-predicate properties
- varnumbers.pl -- Utilities for numbered terms
- explain.pl -- Describe Prolog Terms
- exceptions.pl -- Exception classification
- when.pl -- Conditional coroutining
- coinduction.pl -- Co-Logic Programming
- win_menu.pl -- Console window menu
- tty.pl -- Terminal operations
- prolog_history.pl -- Per-directory persistent commandline history
- streams.pl -- Manage Prolog streams
- library
- trace(:Pred) is det
- trace(:Pred, +PortSpec) is det
- Print passes through ports of specified predicates. Pred is a,
possible partial, specification of a predicate as it is also used be
spy/1 and similar predicates. Where a full predicate specification
is of the shape
Module:Name/Arity
(or `//Arity for non-terminals), both the module and arity may be omitted in which case Pred refers to all matching predicates. PortSpec is either a single port (call
,exit
,fail
orredo
), preceded with+
or-
or a list of these. The predicate modifies the current trace specification and then installs a suitable wrapper for the predicate using wrap_predicate/4. For example:?- trace(append). % lists:append/2: [all] % lists:append/3: [all] % append/1: [all] true. ?- append([a,b], [c], L). T [10] Call: lists:append([a, b], [c], _18032) T [19] Call: lists:append([b], [c], _19410) T [28] Call: lists:append([], [c], _20400) T [28 +0.1ms] Exit: lists:append([], [c], [c]) T [19 +0.2ms] Exit: lists:append([b], [c], [b, c]) T [10 +0.5ms] Exit: lists:append([a, b], [c], [a, b, c]) L = [a, b, c]. ?- trace(append, -all). % lists:append/2: Not tracing % lists:append/3: Not tracing % append/1: Not tracing
The text between [] indicates the call depth (first number) and for all ports except the
call
port the wall time since the start (call port) in milliseconds. Note that the instrumentation and print time is included in the time. In the example above the actual time is about 0.00001ms on todays hardware.In addition, conditions may be specified. In this case the the specification takes the shape
trace(:Head, Port(Condition))
. For example:?- trace(current_prolog_flag(Flag, Value), call(var(Flag))). ?- list_tracing. % Trace points (see trace/1,2) on: % system:current_prolog_flag(A,_): [call(var(A))]
This specification will only print the goal if the registered condition succeeds. Note that we can use the condition for its side effect and then fail to avoid printing the event. Clearing the trace event on all relevant ports removes the condition. There is currently no way to modify the condition without clearing the trace point first.