/* Evaluator for GNU Emacs Lisp interpreter.
- Copyright (C) 1985-1987, 1993-1995, 1999-2011 Free Software Foundation, Inc.
+ Copyright (C) 1985-1987, 1993-1995, 1999-2012 Free Software Foundation, Inc.
This file is part of GNU Emacs.
int gcpro_level;
#endif
-Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun;
+Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp;
Lisp_Object Qinhibit_quit;
Lisp_Object Qand_rest;
static Lisp_Object Qand_optional;
int handling_signal;
+/* If non-nil, Lisp code must not be run since some part of Emacs is
+ in an inconsistent state. Currently, x-create-frame uses this to
+ avoid triggering window-configuration-change-hook while the new
+ frame is half-initialized. */
+Lisp_Object inhibit_lisp_code;
+
static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *);
-static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN;
static int interactive_p (int);
static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args);
-static Lisp_Object Ffetch_bytecode (Lisp_Object);
\f
void
init_eval_once (void)
{
enum { size = 50 };
- specpdl = (struct specbinding *) xmalloc (size * sizeof (struct specbinding));
+ specpdl = xmalloc (size * sizeof *specpdl);
specpdl_size = size;
specpdl_ptr = specpdl;
/* Don't forget to update docs (lispref node "Local Variables"). */
}
-DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0,
- doc: /* Define NAME as a function.
-The definition is (lambda ARGLIST [DOCSTRING] BODY...).
-See also the function `interactive'.
-usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */)
- (Lisp_Object args)
-{
- register Lisp_Object fn_name;
- register Lisp_Object defn;
-
- fn_name = Fcar (args);
- CHECK_SYMBOL (fn_name);
- defn = Fcons (Qlambda, Fcdr (args));
- if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */
- defn = Ffunction (Fcons (defn, Qnil));
- if (!NILP (Vpurify_flag))
- defn = Fpurecopy (defn);
- if (CONSP (XSYMBOL (fn_name)->function)
- && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload))
- LOADHIST_ATTACH (Fcons (Qt, fn_name));
- Ffset (fn_name, defn);
- LOADHIST_ATTACH (Fcons (Qdefun, fn_name));
- return fn_name;
-}
-
-DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0,
- doc: /* Define NAME as a macro.
-The actual definition looks like
- (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...).
-When the macro is called, as in (NAME ARGS...),
-the function (lambda ARGLIST BODY...) is applied to
-the list ARGS... as it appears in the expression,
-and the result should be a form to be evaluated instead of the original.
-
-DECL is a declaration, optional, which can specify how to indent
-calls to this macro, how Edebug should handle it, and which argument
-should be treated as documentation. It looks like this:
- (declare SPECS...)
-The elements can look like this:
- (indent INDENT)
- Set NAME's `lisp-indent-function' property to INDENT.
-
- (debug DEBUG)
- Set NAME's `edebug-form-spec' property to DEBUG. (This is
- equivalent to writing a `def-edebug-spec' for the macro.)
-
- (doc-string ELT)
- Set NAME's `doc-string-elt' property to ELT.
-
-usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */)
- (Lisp_Object args)
-{
- register Lisp_Object fn_name;
- register Lisp_Object defn;
- Lisp_Object lambda_list, doc, tail;
-
- fn_name = Fcar (args);
- CHECK_SYMBOL (fn_name);
- lambda_list = Fcar (Fcdr (args));
- tail = Fcdr (Fcdr (args));
-
- doc = Qnil;
- if (STRINGP (Fcar (tail)))
- {
- doc = XCAR (tail);
- tail = XCDR (tail);
- }
-
- if (CONSP (Fcar (tail))
- && EQ (Fcar (Fcar (tail)), Qdeclare))
- {
- if (!NILP (Vmacro_declaration_function))
- {
- struct gcpro gcpro1;
- GCPRO1 (args);
- call2 (Vmacro_declaration_function, fn_name, Fcar (tail));
- UNGCPRO;
- }
-
- tail = Fcdr (tail);
- }
-
- if (NILP (doc))
- tail = Fcons (lambda_list, tail);
- else
- tail = Fcons (lambda_list, Fcons (doc, tail));
-
- defn = Fcons (Qlambda, tail);
- if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */
- defn = Ffunction (Fcons (defn, Qnil));
- defn = Fcons (Qmacro, defn);
-
- if (!NILP (Vpurify_flag))
- defn = Fpurecopy (defn);
- if (CONSP (XSYMBOL (fn_name)->function)
- && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload))
- LOADHIST_ATTACH (Fcons (Qt, fn_name));
- Ffset (fn_name, defn);
- LOADHIST_ATTACH (Fcons (Qdefun, fn_name));
- return fn_name;
-}
-
-
DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0,
doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE.
Aliased variables always have the same value; setting one sets the other.
DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0,
doc: /* Define SYMBOL as a variable, and return SYMBOL.
-You are not required to define a variable in order to use it,
-but the definition can supply documentation and an initial value
-in a way that tags can recognize.
-
-INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.
-If SYMBOL is buffer-local, its default value is what is set;
- buffer-local values are not affected.
-INITVALUE and DOCSTRING are optional.
-If DOCSTRING starts with *, this variable is identified as a user option.
- This means that M-x set-variable recognizes it.
- See also `user-variable-p'.
+You are not required to define a variable in order to use it, but
+defining it lets you supply an initial value and documentation, which
+can be referred to by the Emacs help facilities and other programming
+tools. The `defvar' form also declares the variable as \"special\",
+so that it is always dynamically bound even if `lexical-binding' is t.
+
+The optional argument INITVALUE is evaluated, and used to set SYMBOL,
+only if SYMBOL's value is void. If SYMBOL is buffer-local, its
+default value is what is set; buffer-local values are not affected.
If INITVALUE is missing, SYMBOL's value is not set.
If SYMBOL has a local binding, then this form affects the local
`defcustom', you should always load that file _outside_ any bindings
for these variables. \(`defconst' and `defcustom' behave similarly in
this respect.)
+
+The optional argument DOCSTRING is a documentation string for the
+variable.
+
+To define a user option, use `defcustom' instead of `defvar'.
usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */)
(Lisp_Object args)
{
DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0,
doc: /* Define SYMBOL as a constant variable.
-The intent is that neither programs nor users should ever change this value.
-Always sets the value of SYMBOL to the result of evalling INITVALUE.
-If SYMBOL is buffer-local, its default value is what is set;
- buffer-local values are not affected.
-DOCSTRING is optional.
-
-If SYMBOL has a local binding, then this form sets the local binding's
-value. However, you should normally not make local bindings for
-variables defined with this form.
+This declares that neither programs nor users should ever change the
+value. This constancy is not actually enforced by Emacs Lisp, but
+SYMBOL is marked as a special variable so that it is never lexically
+bound.
+
+The `defconst' form always sets the value of SYMBOL to the result of
+evalling INITVALUE. If SYMBOL is buffer-local, its default value is
+what is set; buffer-local values are not affected. If SYMBOL has a
+local binding, then this form sets the local binding's value.
+However, you should normally not make local bindings for variables
+defined with this form.
+
+The optional DOCSTRING specifies the variable's documentation string.
usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
(Lisp_Object args)
{
return sym;
}
-/* Error handler used in Fuser_variable_p. */
-static Lisp_Object
-user_variable_p_eh (Lisp_Object ignore)
+/* Make SYMBOL lexically scoped. */
+DEFUN ("internal-make-var-non-special", Fmake_var_non_special,
+ Smake_var_non_special, 1, 1, 0,
+ doc: /* Internal function. */)
+ (Lisp_Object symbol)
{
+ CHECK_SYMBOL (symbol);
+ XSYMBOL (symbol)->declared_special = 0;
return Qnil;
}
-static Lisp_Object
-lisp_indirect_variable (Lisp_Object sym)
-{
- struct Lisp_Symbol *s = indirect_variable (XSYMBOL (sym));
- XSETSYMBOL (sym, s);
- return sym;
-}
-
-DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0,
- doc: /* Return t if VARIABLE is intended to be set and modified by users.
-\(The alternative is a variable used internally in a Lisp program.)
-A variable is a user variable if
-\(1) the first character of its documentation is `*', or
-\(2) it is customizable (its property list contains a non-nil value
- of `standard-value' or `custom-autoload'), or
-\(3) it is an alias for another user variable.
-Return nil if VARIABLE is an alias and there is a loop in the
-chain of symbols. */)
- (Lisp_Object variable)
-{
- Lisp_Object documentation;
-
- if (!SYMBOLP (variable))
- return Qnil;
-
- /* If indirect and there's an alias loop, don't check anything else. */
- if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS
- && NILP (internal_condition_case_1 (lisp_indirect_variable, variable,
- Qt, user_variable_p_eh)))
- return Qnil;
-
- while (1)
- {
- documentation = Fget (variable, Qvariable_documentation);
- if (INTEGERP (documentation) && XINT (documentation) < 0)
- return Qt;
- if (STRINGP (documentation)
- && ((unsigned char) SREF (documentation, 0) == '*'))
- return Qt;
- /* If it is (STRING . INTEGER), a negative integer means a user variable. */
- if (CONSP (documentation)
- && STRINGP (XCAR (documentation))
- && INTEGERP (XCDR (documentation))
- && XINT (XCDR (documentation)) < 0)
- return Qt;
- /* Customizable? See `custom-variable-p'. */
- if ((!NILP (Fget (variable, intern ("standard-value"))))
- || (!NILP (Fget (variable, intern ("custom-autoload")))))
- return Qt;
-
- if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS))
- return Qnil;
-
- /* An indirect variable? Let's follow the chain. */
- XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable)));
- }
-}
\f
DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0,
doc: /* Bind variables according to VARLIST then eval BODY.
if (NILP (expander))
break;
}
- form = apply1 (expander, XCDR (form));
+ {
+ Lisp_Object newform = apply1 (expander, XCDR (form));
+ if (EQ (form, newform))
+ break;
+ else
+ form = newform;
+ }
}
return form;
}
This is used for correct unwinding in Fthrow and Fsignal. */
-static void
+static _Noreturn void
unwind_to_catch (struct catchtag *catch, Lisp_Object value)
{
- register int last_time;
+ int last_time;
/* Save the value in the tag. */
catch->val = value;
static int maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig,
Lisp_Object data);
+void
+process_quit_flag (void)
+{
+ Lisp_Object flag = Vquit_flag;
+ Vquit_flag = Qnil;
+ if (EQ (flag, Qkill_emacs))
+ Fkill_emacs (Qnil);
+ if (EQ (Vthrow_on_input, flag))
+ Fthrow (Vthrow_on_input, Qt);
+ Fsignal (Qquit, Qnil);
+}
+
DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0,
doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
This function does not return.
/* Only add entries after dumping, because the ones before are
not useful and else we get loads of them from the loaddefs.el. */
LOADHIST_ATTACH (Fcons (Qautoload, function));
- else
- /* We don't want the docstring in purespace (instead,
- Snarf-documentation should (hopefully) overwrite it).
- We used to use 0 here, but that leads to accidental sharing in
- purecopy's hash-consing, so we use a (hopefully) unique integer
- instead. */
- docstring = make_number (XPNTR (function));
+ else if (EQ (docstring, make_number (0)))
+ /* `read1' in lread.c has found the docstring starting with "\
+ and assumed the docstring will be provided by Snarf-documentation, so it
+ passed us 0 instead. But that leads to accidental sharing in purecopy's
+ hash-consing, so we use a (hopefully) unique integer instead. */
+ docstring = make_number (XUNTAG (function, Lisp_Symbol));
return Ffset (function,
Fpurecopy (list5 (Qautoload, file, docstring,
interactive, type)));
error ("Lisp nesting exceeds `max-lisp-eval-depth'");
}
- original_fun = Fcar (form);
- original_args = Fcdr (form);
+ original_fun = XCAR (form);
+ original_args = XCDR (form);
backtrace.next = backtrace_list;
backtrace_list = &backtrace;
return val;
}
\f
-DEFUN ("apply", Fapply, Sapply, 2, MANY, 0,
+DEFUN ("apply", Fapply, Sapply, 1, MANY, 0,
doc: /* Call FUNCTION with our remaining args, using our last arg as list of args.
Then return the value FUNCTION returns.
Thus, (apply '+ 1 2 '(3 4)) returns 10.
{
if (XSUBR (fun)->max_args > numargs)
{
- internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object));
+ internal_args = alloca (XSUBR (fun)->max_args
+ * sizeof *internal_args);
memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object));
for (i = numargs; i < XSUBR (fun)->max_args; i++)
internal_args[i] = Qnil;
syms_of_eval (void)
{
DEFVAR_INT ("max-specpdl-size", max_specpdl_size,
- doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's.
+ doc: /* Limit on number of Lisp variable bindings and `unwind-protect's.
If Lisp code tries to increase the total number past this amount,
an error is signaled.
You can safely use a value considerably larger than the default value,
Emacs could run out of memory trying to make the stack bigger. */);
DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth,
- doc: /* *Limit on depth in `eval', `apply' and `funcall' before error.
+ doc: /* Limit on depth in `eval', `apply' and `funcall' before error.
This limit serves to catch infinite recursions for you before they cause
actual stack overflow in C, which would be fatal for Emacs.
DEFSYM (Qinteractive, "interactive");
DEFSYM (Qcommandp, "commandp");
- DEFSYM (Qdefun, "defun");
DEFSYM (Qand_rest, "&rest");
DEFSYM (Qand_optional, "&optional");
DEFSYM (Qclosure, "closure");
DEFSYM (Qdebug, "debug");
DEFVAR_LISP ("debug-on-error", Vdebug_on_error,
- doc: /* *Non-nil means enter debugger if an error is signaled.
+ doc: /* Non-nil means enter debugger if an error is signaled.
Does not apply to errors handled by `condition-case' or those
matched by `debug-ignored-errors'.
If the value is a list, an error only means to enter the debugger
Vdebug_on_error = Qnil;
DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors,
- doc: /* *List of errors for which the debugger should not be called.
+ doc: /* List of errors for which the debugger should not be called.
Each element may be a condition-name or a regexp that matches error messages.
If any element applies to a given error, that error skips the debugger
and just returns to top level.
Vdebug_ignored_errors = Qnil;
DEFVAR_BOOL ("debug-on-quit", debug_on_quit,
- doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example).
+ doc: /* Non-nil means enter debugger if quit is signaled (C-g, for example).
Does not apply if quit is handled by a `condition-case'. */);
debug_on_quit = 0;
Vsignal_hook_function = Qnil;
DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal,
- doc: /* *Non-nil means call the debugger regardless of condition handlers.
+ doc: /* Non-nil means call the debugger regardless of condition handlers.
Note that `debug-on-error', `debug-on-quit' and friends
still determine whether to handle the particular condition. */);
Vdebug_on_signal = Qnil;
- DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function,
- doc: /* Function to process declarations in a macro definition.
-The function will be called with two args MACRO and DECL.
-MACRO is the name of the macro being defined.
-DECL is a list `(declare ...)' containing the declarations.
-The value the function returns is not used. */);
- Vmacro_declaration_function = Qnil;
-
/* When lexical binding is being used,
- vinternal_interpreter_environment is non-nil, and contains an alist
+ Vinternal_interpreter_environment is non-nil, and contains an alist
of lexically-bound variable, or (t), indicating an empty
environment. The lisp name of this variable would be
`internal-interpreter-environment' if it weren't hidden.
Every element of this list can be either a cons (VAR . VAL)
specifying a lexical binding, or a single symbol VAR indicating
that this variable should use dynamic scoping. */
- DEFSYM (Qinternal_interpreter_environment, "internal-interpreter-environment");
+ DEFSYM (Qinternal_interpreter_environment,
+ "internal-interpreter-environment");
DEFVAR_LISP ("internal-interpreter-environment",
Vinternal_interpreter_environment,
doc: /* If non-nil, the current lexical environment of the lisp interpreter.
A value of `(t)' indicates an empty environment, otherwise it is an
alist of active lexical bindings. */);
Vinternal_interpreter_environment = Qnil;
- /* Don't export this variable to Elisp, so noone can mess with it
+ /* Don't export this variable to Elisp, so no one can mess with it
(Just imagine if someone makes it buffer-local). */
Funintern (Qinternal_interpreter_environment, Qnil);
staticpro (&Vsignaling_function);
Vsignaling_function = Qnil;
+ inhibit_lisp_code = Qnil;
+
defsubr (&Sor);
defsubr (&Sand);
defsubr (&Sif);
defsubr (&Ssetq);
defsubr (&Squote);
defsubr (&Sfunction);
- defsubr (&Sdefun);
- defsubr (&Sdefmacro);
defsubr (&Sdefvar);
defsubr (&Sdefvaralias);
defsubr (&Sdefconst);
- defsubr (&Suser_variable_p);
+ defsubr (&Smake_var_non_special);
defsubr (&Slet);
defsubr (&SletX);
defsubr (&Swhile);
HCoop / bpt / emacs.git / blobdiff