procyberian/emacs
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Minor re-phrasings throughout.

Browse source 
(Edebug Execution Modes): Sit-for affects continue mode too.
(Jumping): Use `forward-sexp' rather than its keybinding.
(Edebug Misc): Fix Q binding.
(Edebug Eval): Remove cl version.
(Printing in Edebug): Clarify print-length etc.
(Instrumenting Macro Calls): Defopt edebug-eval-macro-args.
(Specification List): Remove edebug-unwrap findex entry.
(Specification Examples): defmacro is actually not the same as defun.
Escape "`" in example.
This commit is contained in:
Glenn Morris 2009-07-15 03:09:52 +00:00
parent 2066b4fe21
commit 622fa3800b
2 changed files with 93 additions and 67 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
doc/lispref/ChangeLog
View file

@ -1,3 +1,16 @@
2009-07-15 Glenn Morris <rgm@gnu.org>
* edebug.texi: Minor re-phrasings throughout.
(Edebug Execution Modes): Sit-for affects continue mode too.
(Jumping): Use `forward-sexp' rather than its keybinding.
(Edebug Misc): Fix Q binding.
(Edebug Eval): Remove cl version.
(Printing in Edebug): Clarify print-length etc.
(Instrumenting Macro Calls): Defopt edebug-eval-macro-args.
(Specification List): Remove edebug-unwrap findex entry.
(Specification Examples): defmacro is actually not the same as defun.
Escape "`" in example.
2009-07-15 Chong Yidong <cyd@stupidchicken.com>
* markers.texi (The Mark): Document optional arg to

147
doc/lispref/edebug.texi
View file

@ -14,7 +14,7 @@
@section Edebug
@cindex Edebug debugging facility
Edebug is a source-level debugger for Emacs Lisp programs with which
Edebug is a source-level debugger for Emacs Lisp programs, with which
you can:
@itemize @bullet
@ -40,7 +40,7 @@ Automatically re-evaluate a list of expressions and
display their results each time Edebug updates the display.
@item
Output trace info on function enter and exit.
Output trace information on function calls and returns.
@item
Stop when an error occurs.
@ -56,7 +56,7 @@ Obtain rudimentary coverage testing and frequency counts.
@end itemize
The first three sections below should tell you enough about Edebug to
enable you to use it.
start using it.
@menu
* Using Edebug:: Introduction to use of Edebug.
@ -188,7 +188,7 @@ instrument any top-level form regardless of the values of
(@code{edebug-instrument-callee}) instruments the definition of the
function or macro called by the list form after point, if is not already
instrumented. This is possible only if Edebug knows where to find the
source for that function; for this reading, after loading Edebug,
source for that function; for this reason, after loading Edebug,
@code{eval-region} records the position of every definition it
evaluates, even if not instrumenting it. See also the @kbd{i} command
(@pxref{Jumping}), which steps into the call after instrumenting the
@ -199,7 +199,7 @@ function.
expressions, and other defining forms. However, Edebug cannot determine
on its own what a user-defined macro will do with the arguments of a
macro call, so you must provide that information using Edebug
specifications; see @ref{Edebug and Macros}, for details.
specifications; for details, @pxref{Edebug and Macros}.
When Edebug is about to instrument code for the first time in a
session, it runs the hook @code{edebug-setup-hook}, then sets it to
@ -293,18 +293,18 @@ completely work: exiting from Edebug, to resume the program, loses track
of the keyboard macro. This is not easy to fix. Also, defining or
executing a keyboard macro outside of Edebug does not affect commands
inside Edebug. This is usually an advantage. See also the
@code{edebug-continue-kbd-macro} option (@pxref{Edebug Options}).
@code{edebug-continue-kbd-macro} option in @ref{Edebug Options}.
When you enter a new Edebug level, the initial execution mode comes
from the value of the variable @code{edebug-initial-mode}.
(@xref{Edebug Options}.) By default, this specifies step mode. Note
from the value of the variable @code{edebug-initial-mode}
(@pxref{Edebug Options}). By default, this specifies step mode. Note
that you may reenter the same Edebug level several times if, for
example, an instrumented function is called several times from one
command.
@defopt edebug-sit-for-seconds
This option specifies how many seconds to wait between execution steps
in trace mode. The default is 1 second.
in trace mode or continue mode. The default is 1 second.
@end defopt
@node Jumping
@ -329,7 +329,7 @@ Run the program for one expression
(@code{edebug-forward-sexp}).
@item o
Run the program until the end of the containing sexp.
Run the program until the end of the containing sexp (@code{edebug-step-out}).
@item i
Step into the function or macro called by the form after point.
@ -340,22 +340,22 @@ location of point, using a temporary breakpoint.
The @kbd{f} command runs the program forward over one expression. More
precisely, it sets a temporary breakpoint at the position that
@kbd{C-M-f} would reach, then executes in go mode so that the program
will stop at breakpoints.
@code{forward-sexp} would reach, then executes in go mode so that
the program will stop at breakpoints.
With a prefix argument @var{n}, the temporary breakpoint is placed
@var{n} sexps beyond point. If the containing list ends before @var{n}
more elements, then the place to stop is after the containing
expression.
You must check that the position @kbd{C-M-f} finds is a place that the
program will really get to. In @code{cond}, for example, this may not
be true.
You must check that the position @code{forward-sexp} finds is a place
that the program will really get to. In @code{cond}, for example,
this may not be true.
For flexibility, the @kbd{f} command does @code{forward-sexp} starting
at point, rather than at the stop point. If you want to execute one
expression @emph{from the current stop point}, first type @kbd{w}, to
move point there, and then type @kbd{f}.
expression @emph{from the current stop point}, first type @kbd{w}
(@code{edebug-where}) to move point there, and then type @kbd{f}.
The @kbd{o} command continues ``out of'' an expression. It places a
temporary breakpoint at the end of the sexp containing point. If the
@ -398,7 +398,7 @@ debugging.
@item Q
Like @kbd{q}, but don't stop even for protected code
(@code{top-level-nonstop}).
(@code{edebug-top-level-nonstop}).
@item r
Redisplay the most recently known expression result in the echo area
@ -641,7 +641,8 @@ Evaluate expression @var{exp} in the context outside of Edebug
interference with the evaluation.
@item M-: @var{exp} @key{RET}
Evaluate expression @var{exp} in the context of Edebug itself.
Evaluate expression @var{exp} in the context of Edebug itself
(@code{eval-expression}).
@item C-x C-e
Evaluate the expression before point, in the context outside of Edebug
@ -651,8 +652,8 @@ Evaluate the expression before point, in the context outside of Edebug
@cindex lexical binding (Edebug)
Edebug supports evaluation of expressions containing references to
lexically bound symbols created by the following constructs in
@file{cl.el} (version 2.03 or later): @code{lexical-let},
@code{macrolet}, and @code{symbol-macrolet}.
@file{cl.el}: @code{lexical-let}, @code{macrolet}, and
@code{symbol-macrolet}.
@node Eval List
@subsection Evaluation List Buffer
@ -718,10 +719,10 @@ inserts comment lines so that each expression becomes its own group.
Thus, if you type @kbd{C-c C-u} again without changing the buffer text,
the evaluation list is effectively unchanged.
If an error occurs during an evaluation from the evaluation list, the
error message is displayed in a string as if it were the result.
Therefore, expressions that use variables not currently valid do not
interrupt your debugging.
If an error occurs during an evaluation from the evaluation list,
the error message is displayed in a string as if it were the result.
Therefore, expressions using variables that are not currently valid do
not interrupt your debugging.
Here is an example of what the evaluation list window looks like after
several expressions have been added to it:
@ -769,10 +770,10 @@ list structure, you may get an error when Edebug attempts to print it.
One way to cope with circular structure is to set @code{print-length}
or @code{print-level} to truncate the printing. Edebug does this for
you; it binds @code{print-length} and @code{print-level} to 50 if they
were @code{nil}. (Actually, the variables @code{edebug-print-length}
and @code{edebug-print-level} specify the values to use within Edebug.)
@xref{Output Variables}.
you; it binds @code{print-length} and @code{print-level} to the values
of the variables @code{edebug-print-length} and
@code{edebug-print-level} (so long as they have non-@code{nil}
values). @xref{Output Variables}.
@defopt edebug-print-length
If non-@code{nil}, Edebug binds @code{print-length} to this value while
@ -876,7 +877,7 @@ conditions that each form has returned two different values.
Coverage testing makes execution slower, so it is only done if
@code{edebug-test-coverage} is non-@code{nil}. Frequency counting is
performed for all execution of an instrumented function, even if the
performed for all executions of an instrumented function, even if the
execution mode is Go-nonstop, and regardless of whether coverage testing
is enabled.
@ -891,12 +892,12 @@ information temporarily, only until you type another key.
This command displays the frequency count data for each line of the
current definition.
The frequency counts appear as comment lines after each line of code,
and you can undo all insertions with one @code{undo} command. The
counts appear under the @samp{(} before an expression or the @samp{)}
after an expression, or on the last character of a variable. To
simplify the display, a count is not shown if it is equal to the
count of an earlier expression on the same line.
It inserts frequency counts as comment lines after each line of code.
You can undo all insertions with one @code{undo} command. The counts
appear under the @samp{(} before an expression or the @samp{)} after
an expression, or on the last character of a variable. To simplify
the display, a count is not shown if it is equal to the count of an
earlier expression on the same line.
The character @samp{=} following the count for an expression says that
the expression has returned the same value each time it was evaluated.
@ -954,8 +955,8 @@ program.
@itemize @bullet
@item
@code{max-lisp-eval-depth} and @code{max-specpdl-size} are both
incremented once to reduce Edebug's impact on the stack. You could,
however, still run out of stack space when using Edebug.
increased to reduce Edebug's impact on the stack. You could, however,
still run out of stack space when using Edebug.
@item
The state of keyboard macro execution is saved and restored. While
@ -1011,7 +1012,7 @@ The value of point in each displayed buffer is saved and restored if
@item
The variables @code{overlay-arrow-position} and
@code{overlay-arrow-string} are saved and restored. So you can safely
@code{overlay-arrow-string} are saved and restored, so you can safely
invoke Edebug from the recursive edit elsewhere in the same buffer.
@item
@ -1103,7 +1104,7 @@ For example, (for i from 1 to 10 do (print i))."
@end smallexample
The Edebug specification says which parts of a call to the macro are
forms to be evaluated. For simple macros, the @var{specification}
forms to be evaluated. For simple macros, the specification
often looks very similar to the formal argument list of the macro
definition, but specifications are much more general than macro
arguments. @xref{Defining Macros}, for more explanation of
@ -1135,7 +1136,7 @@ All arguments are instrumented for evaluation.
None of the arguments is instrumented.
@item a symbol
The symbol must have an Edebug specification which is used instead.
The symbol must have an Edebug specification, which is used instead.
This indirection is repeated until another kind of specification is
found. This allows you to inherit the specification from another macro.
@ -1145,12 +1146,16 @@ calling form. The possible elements of a specification list are
described in the following sections.
@end table
@vindex edebug-eval-macro-args
If a macro has no Edebug specification, neither through a @code{debug}
declaration nor through a @code{def-edebug-spec} call, the variable
@code{edebug-eval-macro-args} comes into play. If it is @code{nil},
the default, none of the arguments is instrumented for evaluation.
If it is non-@code{nil}, all arguments are instrumented.
@code{edebug-eval-macro-args} comes into play.
@defopt edebug-eval-macro-args
This controls the way Edebug treats macro arguments with no explicit
Edebug specification. If it is @code{nil} (the default), none of the
arguments is instrumented for evaluation. Otherwise, all arguments
are instrumented.
@end defopt
@node Specification List
@subsubsection Specification List
@ -1170,8 +1175,8 @@ levels. Specification keywords apply only to the remainder of the
sublist or group they are contained in.
When a specification list involves alternatives or repetition, matching
it against an actual macro call may require backtracking.
@xref{Backtracking}, for more details.
it against an actual macro call may require backtracking. For more
details, @pxref{Backtracking}.
Edebug specifications provide the power of regular expression matching,
plus some context-free grammar constructs: the matching of sublists with
@ -1191,7 +1196,8 @@ A single unevaluated Lisp object, which is not instrumented.
A single evaluated expression, which is instrumented.
@item place
@findex edebug-unwrap
@c I can't see that this index entry is useful without any explanation.
@c @findex edebug-unwrap
A place to store a value, as in the Common Lisp @code{setf} construct.
@item body
@ -1275,11 +1281,11 @@ If the symbol has an Edebug specification, this @dfn{indirect
specification} should be either a list specification that is used in
place of the symbol, or a function that is called to process the
arguments. The specification may be defined with @code{def-edebug-spec}
just as for macros. See the @code{defun} example.
just as for macros. See the @code{defun} example.
Otherwise, the symbol should be a predicate. The predicate is called
with the argument and the specification fails if the predicate returns
@code{nil}. In either case, that argument is not instrumented.
@code{nil}, and the argument is not instrumented.
Some suitable predicates include @code{symbolp}, @code{integerp},
@code{stringp}, @code{vectorp}, and @code{atom}.
@ -1355,7 +1361,7 @@ within the definition.
@item def-form
The argument is a single, highest-level form in a definition. This is
like @code{def-body}, except use this to match a single form rather than
like @code{def-body}, except it is used to match a single form rather than
a list of forms. As a special case, @code{def-form} also means that
tracing information is not output when the form is executed. See the
@code{interactive} example.
@ -1374,15 +1380,15 @@ matched by some element in the specification, and every required element
in the specification must match some argument.
When a syntax error is detected, it might not be reported until much
later after higher-level alternatives have been exhausted, and with the
later, after higher-level alternatives have been exhausted, and with the
point positioned further from the real error. But if backtracking is
disabled when an error occurs, it can be reported immediately. Note
that backtracking is also reenabled automatically in several situations;
it is reenabled when a new alternative is established by
@code{&optional}, @code{&rest}, or @code{&or}, or at the start of
processing a sublist, group, or indirect specification. The effect of
enabling or disabling backtracking is limited to the remainder of the
level currently being processed and lower levels.
when a new alternative is established by @code{&optional},
@code{&rest}, or @code{&or}, or at the start of processing a sublist,
group, or indirect specification. The effect of enabling or disabling
backtracking is limited to the remainder of the level currently being
processed and lower levels.
Backtracking is disabled while matching any of the
form specifications (that is, @code{form}, @code{body}, @code{def-form}, and
@ -1413,6 +1419,7 @@ of the bindings is either a symbol or a sublist with a symbol and
optional expression. In the specification below, notice the @code{gate}
inside of the sublist to prevent backtracking once a sublist is found.
@c FIXME? The actual definition in edebug.el does not have a gate.
@example
(def-edebug-spec let
((&rest
@ -1420,14 +1427,14 @@ inside of the sublist to prevent backtracking once a sublist is found.
body))
@end example
Edebug uses the following specifications for @code{defun} and
@code{defmacro} and the associated argument list and @code{interactive}
specifications. It is necessary to handle interactive forms specially
since an expression argument is actually evaluated outside of the
function body.
Edebug uses the following specifications for @code{defun} and the
associated argument list and @code{interactive} specifications. It is
necessary to handle interactive forms specially since an expression
argument is actually evaluated outside of the function body. (The
specification for @code{defmacro} is very similar to that for
@code{defun}, but allows for the @code{declare} statement.)
@smallexample
(def-edebug-spec defmacro defun) ; @r{Indirect ref to @code{defun} spec.}
(def-edebug-spec defun
(&define name lambda-list
[&optional stringp] ; @r{Match the doc string, if present.}
@ -1447,11 +1454,12 @@ function body.
The specification for backquote below illustrates how to match
dotted lists and use @code{nil} to terminate recursion. It also
illustrates how components of a vector may be matched. (The actual
specification defined by Edebug does not support dotted lists because
doing so causes very deep recursion that could fail.)
specification defined by Edebug is a little different, and does not
support dotted lists because doing so causes very deep recursion that
could fail.)
@smallexample
(def-edebug-spec ` (backquote-form)) ; @r{Alias just for clarity.}
(def-edebug-spec \` (backquote-form)) ; @r{Alias just for clarity.}
(def-edebug-spec backquote-form
(&or ([&or "," ",@@"] &or ("quote" backquote-form) form)
@ -1465,6 +1473,9 @@ doing so causes very deep recursion that could fail.)
@subsection Edebug Options
These options affect the behavior of Edebug:
@c Previously defopt'd:
@c edebug-sit-for-seconds, edebug-print-length, edebug-print-level
@c edebug-print-circle, edebug-eval-macro-args
@defopt edebug-setup-hook
Functions to call before Edebug is used. Each time it is set to a new
@ -1513,7 +1524,7 @@ If this is non-@code{nil}, Edebug saves and restores point in all
displayed buffers.
Saving and restoring point in other buffers is necessary if you are
debugging code that changes the point of a buffer which is displayed in
debugging code that changes the point of a buffer that is displayed in
a non-selected window. If Edebug or the user then selects the window,
point in that buffer will move to the window's value of point.
@ -1552,6 +1563,8 @@ debugged.
@xref{Edebug Execution Modes}.
@end defopt
@c FIXME edebug-unwrap-results
@defopt edebug-on-error
Edebug binds @code{debug-on-error} to this value, if
@code{debug-on-error} was previously @code{nil}. @xref{Trapping