SCM_REC_MUTEX (source_mutex);
+
+/* Lookup a given local variable in an environment. The local variable is
+ * given as an iloc, that is a triple <frame, binding, last?>, where frame
+ * indicates the relative number of the environment frame (counting upwards
+ * from the innermost environment frame), binding indicates the number of the
+ * binding within the frame, and last? (which is extracted from the iloc using
+ * the macro SCM_ICDRP) indicates whether the binding forms the binding at the
+ * very end of the improper list of bindings. */
SCM *
scm_ilookup (SCM iloc, SCM env)
{
- register long ir = SCM_IFRAME (iloc);
- register SCM er = env;
- for (; 0 != ir; --ir)
- er = SCM_CDR (er);
- er = SCM_CAR (er);
- for (ir = SCM_IDIST (iloc); 0 != ir; --ir)
- er = SCM_CDR (er);
+ unsigned int frame_nr = SCM_IFRAME (iloc);
+ unsigned int binding_nr = SCM_IDIST (iloc);
+ SCM frames = env;
+ SCM bindings;
+
+ for (; 0 != frame_nr; --frame_nr)
+ frames = SCM_CDR (frames);
+
+ bindings = SCM_CAR (frames);
+ for (; 0 != binding_nr; --binding_nr)
+ bindings = SCM_CDR (bindings);
+
if (SCM_ICDRP (iloc))
- return SCM_CDRLOC (er);
- return SCM_CARLOC (SCM_CDR (er));
+ return SCM_CDRLOC (bindings);
+ return SCM_CARLOC (SCM_CDR (bindings));
}
+
/* The Lookup Car Race
- by Eva Luator
}
-SCM_SYNTAX (s_quote, "quote", scm_makmmacro, scm_m_quote);
-SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote);
-
-SCM
-scm_m_quote (SCM xorig, SCM env SCM_UNUSED)
-{
- SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1, scm_s_expression, s_quote);
- return scm_cons (SCM_IM_QUOTE, SCM_CDR (xorig));
-}
-
-
-SCM_SYNTAX (s_begin, "begin", scm_makmmacro, scm_m_begin);
-SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin);
-
-SCM
-scm_m_begin (SCM xorig, SCM env SCM_UNUSED)
-{
- SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) >= 0, scm_s_expression, s_begin);
- return scm_cons (SCM_IM_BEGIN, SCM_CDR (xorig));
-}
-
-
-SCM_SYNTAX (s_if, "if", scm_makmmacro, scm_m_if);
-SCM_GLOBAL_SYMBOL (scm_sym_if, s_if);
-
-SCM
-scm_m_if (SCM xorig, SCM env SCM_UNUSED)
-{
- long len = scm_ilength (SCM_CDR (xorig));
- SCM_ASSYNT (len >= 2 && len <= 3, scm_s_expression, s_if);
- return scm_cons (SCM_IM_IF, SCM_CDR (xorig));
-}
-
-
-/* Will go into the RnRS module when Guile is factorized.
-SCM_SYNTAX (s_set_x, "set!", scm_makmmacro, scm_m_set_x); */
-static const char s_set_x[] = "set!";
-SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x);
-
-SCM
-scm_m_set_x (SCM xorig, SCM env SCM_UNUSED)
-{
- SCM x = SCM_CDR (xorig);
- SCM_ASSYNT (scm_ilength (x) == 2, scm_s_expression, s_set_x);
- SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (x)), scm_s_variable, s_set_x);
- return scm_cons (SCM_IM_SET_X, x);
-}
+/* Start of the memoizers for the standard R5RS builtin macros. */
SCM_SYNTAX (s_and, "and", scm_makmmacro, scm_m_and);
}
-SCM_SYNTAX (s_or, "or", scm_makmmacro, scm_m_or);
-SCM_GLOBAL_SYMBOL (scm_sym_or, s_or);
+SCM_SYNTAX (s_begin, "begin", scm_makmmacro, scm_m_begin);
+SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin);
SCM
-scm_m_or (SCM xorig, SCM env SCM_UNUSED)
+scm_m_begin (SCM xorig, SCM env SCM_UNUSED)
{
- long len = scm_ilength (SCM_CDR (xorig));
- SCM_ASSYNT (len >= 0, scm_s_test, s_or);
- if (len >= 1)
- return scm_cons (SCM_IM_OR, SCM_CDR (xorig));
- else
- return SCM_BOOL_F;
+ SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) >= 0, scm_s_expression, s_begin);
+ return scm_cons (SCM_IM_BEGIN, SCM_CDR (xorig));
}
}
-SCM_SYNTAX (s_lambda, "lambda", scm_makmmacro, scm_m_lambda);
-SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda);
+SCM_SYNTAX(s_define, "define", scm_makmmacro, scm_m_define);
+SCM_GLOBAL_SYMBOL(scm_sym_define, s_define);
-/* Return true if OBJ is `eq?' to one of the elements of LIST or to the
- * cdr of the last cons. (Thus, LIST is not required to be a proper
- * list and OBJ can also be found in the improper ending.) */
-static int
-scm_c_improper_memq (SCM obj, SCM list)
+/* Guile provides an extension to R5RS' define syntax to represent function
+ * currying in a compact way. With this extension, it is allowed to write
+ * (define <nested-variable> <body>), where <nested-variable> has of one of
+ * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>),
+ * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals>
+ * should be either a sequence of zero or more variables, or a sequence of one
+ * or more variables followed by a space-delimited period and another
+ * variable. Each level of argument nesting wraps the <body> within another
+ * lambda expression. For example, the following forms are allowed, each one
+ * followed by an equivalent, more explicit implementation.
+ * Example 1:
+ * (define ((a b . c) . d) <body>) is equivalent to
+ * (define a (lambda (b . c) (lambda d <body>)))
+ * Example 2:
+ * (define (((a) b) c . d) <body>) is equivalent to
+ * (define a (lambda () (lambda (b) (lambda (c . d) <body>))))
+ */
+/* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS
+ * module that does not implement this extension. */
+SCM
+scm_m_define (SCM x, SCM env)
{
- for (; SCM_CONSP (list); list = SCM_CDR (list))
+ SCM name;
+ x = SCM_CDR (x);
+ SCM_ASSYNT (scm_ilength (x) >= 2, scm_s_expression, s_define);
+ name = SCM_CAR (x);
+ x = SCM_CDR (x);
+ while (SCM_CONSP (name))
{
- if (SCM_EQ_P (SCM_CAR (list), obj))
- return 1;
+ /* This while loop realizes function currying by variable nesting. */
+ SCM formals = SCM_CDR (name);
+ x = scm_list_1 (scm_cons2 (scm_sym_lambda, formals, x));
+ name = SCM_CAR (name);
}
- return SCM_EQ_P (list, obj);
-}
-
-SCM
-scm_m_lambda (SCM xorig, SCM env SCM_UNUSED)
-{
- SCM formals;
- SCM x = SCM_CDR (xorig);
-
- SCM_ASSYNT (SCM_CONSP (x), scm_s_formals, s_lambda);
-
- formals = SCM_CAR (x);
- while (SCM_CONSP (formals))
+ SCM_ASSYNT (SCM_SYMBOLP (name), scm_s_variable, s_define);
+ SCM_ASSYNT (scm_ilength (x) == 1, scm_s_expression, s_define);
+ if (SCM_TOP_LEVEL (env))
{
- SCM formal = SCM_CAR (formals);
- SCM_ASSYNT (SCM_SYMBOLP (formal), scm_s_formals, s_lambda);
- if (scm_c_improper_memq (formal, SCM_CDR (formals)))
- scm_misc_error (s_lambda, scm_s_duplicate_formals, SCM_EOL);
- formals = SCM_CDR (formals);
+ SCM var;
+ x = scm_eval_car (x, env);
+ if (SCM_REC_PROCNAMES_P)
+ {
+ SCM tmp = x;
+ while (SCM_MACROP (tmp))
+ tmp = SCM_MACRO_CODE (tmp);
+ if (SCM_CLOSUREP (tmp)
+ /* Only the first definition determines the name. */
+ && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name)))
+ scm_set_procedure_property_x (tmp, scm_sym_name, name);
+ }
+ var = scm_sym2var (name, scm_env_top_level (env), SCM_BOOL_T);
+ SCM_VARIABLE_SET (var, x);
+ return SCM_UNSPECIFIED;
}
- if (!SCM_NULLP (formals) && !SCM_SYMBOLP (formals))
- scm_misc_error (s_lambda, scm_s_formals, SCM_EOL);
-
- return scm_cons2 (SCM_IM_LAMBDA, SCM_CAR (x),
- scm_m_body (SCM_IM_LAMBDA, SCM_CDR (x), s_lambda));
+ else
+ return scm_cons2 (SCM_IM_DEFINE, name, x);
}
-SCM_SYNTAX (s_letstar, "let*", scm_makmmacro, scm_m_letstar);
-SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar);
+SCM_SYNTAX (s_delay, "delay", scm_makmmacro, scm_m_delay);
+SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay);
-/* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vk and initializers
- * i1 .. ik is transformed into the form (#@let* (v1 i1 v2 i2 ...) body*). */
+/* Promises are implemented as closures with an empty parameter list. Thus,
+ * (delay <expression>) is transformed into (#@delay '() <expression>), where
+ * the empty list represents the empty parameter list. This representation
+ * allows for easy creation of the closure during evaluation. */
SCM
-scm_m_letstar (SCM xorig, SCM env SCM_UNUSED)
+scm_m_delay (SCM xorig, SCM env SCM_UNUSED)
{
- SCM bindings;
- SCM x = SCM_CDR (xorig);
- SCM vars = SCM_EOL;
- SCM *varloc = &vars;
-
- SCM_ASSYNT (SCM_CONSP (x), scm_s_bindings, s_letstar);
-
- bindings = SCM_CAR (x);
- SCM_ASSYNT (scm_ilength (bindings) >= 0, scm_s_bindings, s_letstar);
- while (!SCM_NULLP (bindings))
- {
- SCM binding = SCM_CAR (bindings);
- SCM_ASSYNT (scm_ilength (binding) == 2, scm_s_bindings, s_letstar);
- SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding)), scm_s_variable, s_letstar);
- *varloc = scm_list_2 (SCM_CAR (binding), SCM_CADR (binding));
- varloc = SCM_CDRLOC (SCM_CDR (*varloc));
- bindings = SCM_CDR (bindings);
- }
-
- return scm_cons2 (SCM_IM_LETSTAR, vars,
- scm_m_body (SCM_IM_LETSTAR, SCM_CDR (x), s_letstar));
+ SCM_ASSYNT (scm_ilength (xorig) == 2, scm_s_expression, s_delay);
+ return scm_cons2 (SCM_IM_DELAY, SCM_EOL, SCM_CDR (xorig));
}
}
-SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote);
-SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote);
+SCM_SYNTAX (s_if, "if", scm_makmmacro, scm_m_if);
+SCM_GLOBAL_SYMBOL (scm_sym_if, s_if);
-/* Internal function to handle a quasiquotation: 'form' is the parameter in
- * the call (quasiquotation form), 'env' is the environment where unquoted
- * expressions will be evaluated, and 'depth' is the current quasiquotation
- * nesting level and is known to be greater than zero. */
-static SCM
-iqq (SCM form, SCM env, unsigned long int depth)
+SCM
+scm_m_if (SCM xorig, SCM env SCM_UNUSED)
{
- if (SCM_CONSP (form))
- {
- SCM tmp = SCM_CAR (form);
- if (SCM_EQ_P (tmp, scm_sym_quasiquote))
- {
- SCM args = SCM_CDR (form);
- SCM_ASSYNT (scm_ilength (args) == 1, scm_s_expression, s_quasiquote);
- return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1));
- }
- else if (SCM_EQ_P (tmp, scm_sym_unquote))
- {
- SCM args = SCM_CDR (form);
- SCM_ASSYNT (scm_ilength (args) == 1, scm_s_expression, s_quasiquote);
- if (depth - 1 == 0)
- return scm_eval_car (args, env);
- else
- return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1));
- }
- else if (SCM_CONSP (tmp)
- && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing))
- {
- SCM args = SCM_CDR (tmp);
- SCM_ASSYNT (scm_ilength (args) == 1, scm_s_expression, s_quasiquote);
- if (depth - 1 == 0)
- {
- SCM list = scm_eval_car (args, env);
- SCM rest = SCM_CDR (form);
- SCM_ASSYNT (scm_ilength (list) >= 0, s_splicing, s_quasiquote);
- return scm_append (scm_list_2 (list, iqq (rest, env, depth)));
- }
- else
- return scm_cons (iqq (SCM_CAR (form), env, depth - 1),
- iqq (SCM_CDR (form), env, depth));
- }
- else
- return scm_cons (iqq (SCM_CAR (form), env, depth),
- iqq (SCM_CDR (form), env, depth));
- }
- else if (SCM_VECTORP (form))
- {
- size_t i = SCM_VECTOR_LENGTH (form);
- SCM const *const data = SCM_VELTS (form);
- SCM tmp = SCM_EOL;
- while (i != 0)
- tmp = scm_cons (data[--i], tmp);
- scm_remember_upto_here_1 (form);
- return scm_vector (iqq (tmp, env, depth));
- }
- else
- return form;
+ long len = scm_ilength (SCM_CDR (xorig));
+ SCM_ASSYNT (len >= 2 && len <= 3, scm_s_expression, s_if);
+ return scm_cons (SCM_IM_IF, SCM_CDR (xorig));
}
-SCM
-scm_m_quasiquote (SCM xorig, SCM env)
-{
- SCM x = SCM_CDR (xorig);
- SCM_ASSYNT (scm_ilength (x) == 1, scm_s_expression, s_quasiquote);
- return iqq (SCM_CAR (x), env, 1);
-}
-
-
-SCM_SYNTAX (s_delay, "delay", scm_makmmacro, scm_m_delay);
-SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay);
-
-/* Promises are implemented as closures with an empty parameter list. Thus,
- * (delay <expression>) is transformed into (#@delay '() <expression>), where
- * the empty list represents the empty parameter list. This representation
- * allows for easy creation of the closure during evaluation. */
-SCM
-scm_m_delay (SCM xorig, SCM env SCM_UNUSED)
-{
- SCM_ASSYNT (scm_ilength (xorig) == 2, scm_s_expression, s_delay);
- return scm_cons2 (SCM_IM_DELAY, SCM_EOL, SCM_CDR (xorig));
-}
+SCM_SYNTAX (s_lambda, "lambda", scm_makmmacro, scm_m_lambda);
+SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda);
-SCM_SYNTAX (s_gset_x, "set!", scm_makmmacro, scm_m_generalized_set_x);
-SCM_SYMBOL (scm_sym_setter, "setter");
-
-SCM
-scm_m_generalized_set_x (SCM xorig, SCM env SCM_UNUSED)
+/* Return true if OBJ is `eq?' to one of the elements of LIST or to the
+ * cdr of the last cons. (Thus, LIST is not required to be a proper
+ * list and OBJ can also be found in the improper ending.) */
+static int
+scm_c_improper_memq (SCM obj, SCM list)
{
- SCM x = SCM_CDR (xorig);
- SCM_ASSYNT (2 == scm_ilength (x), scm_s_expression, s_set_x);
- if (SCM_SYMBOLP (SCM_CAR (x)))
- return scm_cons (SCM_IM_SET_X, x);
- else if (SCM_CONSP (SCM_CAR (x)))
- return scm_cons (scm_list_2 (scm_sym_setter, SCM_CAAR (x)),
- scm_append (scm_list_2 (SCM_CDAR (x), SCM_CDR (x))));
- else
- scm_misc_error (s_set_x, scm_s_variable, SCM_EOL);
+ for (; SCM_CONSP (list); list = SCM_CDR (list))
+ {
+ if (SCM_EQ_P (SCM_CAR (list), obj))
+ return 1;
+ }
+ return SCM_EQ_P (list, obj);
}
-
-SCM_SYNTAX (s_future, "future", scm_makmmacro, scm_m_future);
-SCM_GLOBAL_SYMBOL (scm_sym_future, s_future);
-
-/* Like promises, futures are implemented as closures with an empty
- * parameter list. Thus, (future <expression>) is transformed into
- * (#@future '() <expression>), where the empty list represents the
- * empty parameter list. This representation allows for easy creation
- * of the closure during evaluation. */
SCM
-scm_m_future (SCM xorig, SCM env SCM_UNUSED)
+scm_m_lambda (SCM xorig, SCM env SCM_UNUSED)
{
- SCM_ASSYNT (scm_ilength (xorig) == 2, scm_s_expression, s_future);
- return scm_cons2 (SCM_IM_FUTURE, SCM_EOL, SCM_CDR (xorig));
-}
-
+ SCM formals;
+ SCM x = SCM_CDR (xorig);
-SCM_SYNTAX(s_define, "define", scm_makmmacro, scm_m_define);
-SCM_GLOBAL_SYMBOL(scm_sym_define, s_define);
+ SCM_ASSYNT (SCM_CONSP (x), scm_s_formals, s_lambda);
-/* Guile provides an extension to R5RS' define syntax to represent function
- * currying in a compact way. With this extension, it is allowed to write
- * (define <nested-variable> <body>), where <nested-variable> has of one of
- * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>),
- * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals>
- * should be either a sequence of zero or more variables, or a sequence of one
- * or more variables followed by a space-delimited period and another
- * variable. Each level of argument nesting wraps the <body> within another
- * lambda expression. For example, the following forms are allowed, each one
- * followed by an equivalent, more explicit implementation.
- * Example 1:
- * (define ((a b . c) . d) <body>) is equivalent to
- * (define a (lambda (b . c) (lambda d <body>)))
- * Example 2:
- * (define (((a) b) c . d) <body>) is equivalent to
- * (define a (lambda () (lambda (b) (lambda (c . d) <body>))))
- */
-/* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS
- * module that does not implement this extension. */
-SCM
-scm_m_define (SCM x, SCM env)
-{
- SCM name;
- x = SCM_CDR (x);
- SCM_ASSYNT (scm_ilength (x) >= 2, scm_s_expression, s_define);
- name = SCM_CAR (x);
- x = SCM_CDR (x);
- while (SCM_CONSP (name))
- {
- /* This while loop realizes function currying by variable nesting. */
- SCM formals = SCM_CDR (name);
- x = scm_list_1 (scm_cons2 (scm_sym_lambda, formals, x));
- name = SCM_CAR (name);
- }
- SCM_ASSYNT (SCM_SYMBOLP (name), scm_s_variable, s_define);
- SCM_ASSYNT (scm_ilength (x) == 1, scm_s_expression, s_define);
- if (SCM_TOP_LEVEL (env))
+ formals = SCM_CAR (x);
+ while (SCM_CONSP (formals))
{
- SCM var;
- x = scm_eval_car (x, env);
- if (SCM_REC_PROCNAMES_P)
- {
- SCM tmp = x;
- while (SCM_MACROP (tmp))
- tmp = SCM_MACRO_CODE (tmp);
- if (SCM_CLOSUREP (tmp)
- /* Only the first definition determines the name. */
- && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name)))
- scm_set_procedure_property_x (tmp, scm_sym_name, name);
- }
- var = scm_sym2var (name, scm_env_top_level (env), SCM_BOOL_T);
- SCM_VARIABLE_SET (var, x);
- return SCM_UNSPECIFIED;
+ SCM formal = SCM_CAR (formals);
+ SCM_ASSYNT (SCM_SYMBOLP (formal), scm_s_formals, s_lambda);
+ if (scm_c_improper_memq (formal, SCM_CDR (formals)))
+ scm_misc_error (s_lambda, scm_s_duplicate_formals, SCM_EOL);
+ formals = SCM_CDR (formals);
}
- else
- return scm_cons2 (SCM_IM_DEFINE, name, x);
+ if (!SCM_NULLP (formals) && !SCM_SYMBOLP (formals))
+ scm_misc_error (s_lambda, scm_s_formals, SCM_EOL);
+
+ return scm_cons2 (SCM_IM_LAMBDA, SCM_CAR (x),
+ scm_m_body (SCM_IM_LAMBDA, SCM_CDR (x), s_lambda));
}
}
-SCM_SYNTAX(s_letrec, "letrec", scm_makmmacro, scm_m_letrec);
-SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec);
-
-SCM
-scm_m_letrec (SCM xorig, SCM env)
-{
- SCM x = SCM_CDR (xorig);
- SCM_ASSYNT (SCM_CONSP (x), scm_s_bindings, s_letrec);
-
- if (SCM_NULLP (SCM_CAR (x)))
- {
- /* null binding, let* faster */
- SCM body = scm_m_body (SCM_IM_LETREC, SCM_CDR (x), s_letrec);
- return scm_m_letstar (scm_cons2 (SCM_CAR (xorig), SCM_EOL, body), env);
- }
- else
- {
- SCM rvars, inits, body;
- transform_bindings (SCM_CAR (x), &rvars, &inits, "letrec");
- body = scm_m_body (SCM_IM_LETREC, SCM_CDR (x), "letrec");
- return scm_cons2 (SCM_IM_LETREC, rvars, scm_cons (inits, body));
- }
-}
-
-
SCM_SYNTAX(s_let, "let", scm_makmmacro, scm_m_let);
SCM_GLOBAL_SYMBOL(scm_sym_let, s_let);
initloc = SCM_CDRLOC (*initloc);
bindings = SCM_CDR (bindings);
}
-
- {
- SCM lambda_body = scm_m_body (SCM_IM_LET, SCM_CDR (x), "let");
- SCM lambda_form = scm_cons2 (scm_sym_lambda, vars, lambda_body);
- SCM rvar = scm_list_1 (name);
- SCM init = scm_list_1 (lambda_form);
- SCM body = scm_m_body (SCM_IM_LET, scm_list_1 (name), "let");
- SCM letrec = scm_cons2 (SCM_IM_LETREC, rvar, scm_cons (init, body));
- return scm_cons (letrec, inits);
- }
+
+ {
+ SCM lambda_body = scm_m_body (SCM_IM_LET, SCM_CDR (x), "let");
+ SCM lambda_form = scm_cons2 (scm_sym_lambda, vars, lambda_body);
+ SCM rvar = scm_list_1 (name);
+ SCM init = scm_list_1 (lambda_form);
+ SCM body = scm_m_body (SCM_IM_LET, scm_list_1 (name), "let");
+ SCM letrec = scm_cons2 (SCM_IM_LETREC, rvar, scm_cons (init, body));
+ return scm_cons (letrec, inits);
+ }
+ }
+}
+
+
+SCM_SYNTAX (s_letstar, "let*", scm_makmmacro, scm_m_letstar);
+SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar);
+
+/* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vk and initializers
+ * i1 .. ik is transformed into the form (#@let* (v1 i1 v2 i2 ...) body*). */
+SCM
+scm_m_letstar (SCM xorig, SCM env SCM_UNUSED)
+{
+ SCM bindings;
+ SCM x = SCM_CDR (xorig);
+ SCM vars = SCM_EOL;
+ SCM *varloc = &vars;
+
+ SCM_ASSYNT (SCM_CONSP (x), scm_s_bindings, s_letstar);
+
+ bindings = SCM_CAR (x);
+ SCM_ASSYNT (scm_ilength (bindings) >= 0, scm_s_bindings, s_letstar);
+ while (!SCM_NULLP (bindings))
+ {
+ SCM binding = SCM_CAR (bindings);
+ SCM_ASSYNT (scm_ilength (binding) == 2, scm_s_bindings, s_letstar);
+ SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding)), scm_s_variable, s_letstar);
+ *varloc = scm_list_2 (SCM_CAR (binding), SCM_CADR (binding));
+ varloc = SCM_CDRLOC (SCM_CDR (*varloc));
+ bindings = SCM_CDR (bindings);
+ }
+
+ return scm_cons2 (SCM_IM_LETSTAR, vars,
+ scm_m_body (SCM_IM_LETSTAR, SCM_CDR (x), s_letstar));
+}
+
+
+SCM_SYNTAX(s_letrec, "letrec", scm_makmmacro, scm_m_letrec);
+SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec);
+
+SCM
+scm_m_letrec (SCM xorig, SCM env)
+{
+ SCM x = SCM_CDR (xorig);
+ SCM_ASSYNT (SCM_CONSP (x), scm_s_bindings, s_letrec);
+
+ if (SCM_NULLP (SCM_CAR (x)))
+ {
+ /* null binding, let* faster */
+ SCM body = scm_m_body (SCM_IM_LETREC, SCM_CDR (x), s_letrec);
+ return scm_m_letstar (scm_cons2 (SCM_CAR (xorig), SCM_EOL, body), env);
+ }
+ else
+ {
+ SCM rvars, inits, body;
+ transform_bindings (SCM_CAR (x), &rvars, &inits, "letrec");
+ body = scm_m_body (SCM_IM_LETREC, SCM_CDR (x), "letrec");
+ return scm_cons2 (SCM_IM_LETREC, rvars, scm_cons (inits, body));
+ }
+}
+
+
+SCM_SYNTAX (s_or, "or", scm_makmmacro, scm_m_or);
+SCM_GLOBAL_SYMBOL (scm_sym_or, s_or);
+
+SCM
+scm_m_or (SCM xorig, SCM env SCM_UNUSED)
+{
+ long len = scm_ilength (SCM_CDR (xorig));
+ SCM_ASSYNT (len >= 0, scm_s_test, s_or);
+ if (len >= 1)
+ return scm_cons (SCM_IM_OR, SCM_CDR (xorig));
+ else
+ return SCM_BOOL_F;
+}
+
+
+SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote);
+SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote);
+
+/* Internal function to handle a quasiquotation: 'form' is the parameter in
+ * the call (quasiquotation form), 'env' is the environment where unquoted
+ * expressions will be evaluated, and 'depth' is the current quasiquotation
+ * nesting level and is known to be greater than zero. */
+static SCM
+iqq (SCM form, SCM env, unsigned long int depth)
+{
+ if (SCM_CONSP (form))
+ {
+ SCM tmp = SCM_CAR (form);
+ if (SCM_EQ_P (tmp, scm_sym_quasiquote))
+ {
+ SCM args = SCM_CDR (form);
+ SCM_ASSYNT (scm_ilength (args) == 1, scm_s_expression, s_quasiquote);
+ return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1));
+ }
+ else if (SCM_EQ_P (tmp, scm_sym_unquote))
+ {
+ SCM args = SCM_CDR (form);
+ SCM_ASSYNT (scm_ilength (args) == 1, scm_s_expression, s_quasiquote);
+ if (depth - 1 == 0)
+ return scm_eval_car (args, env);
+ else
+ return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1));
+ }
+ else if (SCM_CONSP (tmp)
+ && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing))
+ {
+ SCM args = SCM_CDR (tmp);
+ SCM_ASSYNT (scm_ilength (args) == 1, scm_s_expression, s_quasiquote);
+ if (depth - 1 == 0)
+ {
+ SCM list = scm_eval_car (args, env);
+ SCM rest = SCM_CDR (form);
+ SCM_ASSYNT (scm_ilength (list) >= 0, s_splicing, s_quasiquote);
+ return scm_append (scm_list_2 (list, iqq (rest, env, depth)));
+ }
+ else
+ return scm_cons (iqq (SCM_CAR (form), env, depth - 1),
+ iqq (SCM_CDR (form), env, depth));
+ }
+ else
+ return scm_cons (iqq (SCM_CAR (form), env, depth),
+ iqq (SCM_CDR (form), env, depth));
+ }
+ else if (SCM_VECTORP (form))
+ {
+ size_t i = SCM_VECTOR_LENGTH (form);
+ SCM const *const data = SCM_VELTS (form);
+ SCM tmp = SCM_EOL;
+ while (i != 0)
+ tmp = scm_cons (data[--i], tmp);
+ scm_remember_upto_here_1 (form);
+ return scm_vector (iqq (tmp, env, depth));
}
+ else
+ return form;
}
-
-SCM_SYNTAX (s_atapply, "@apply", scm_makmmacro, scm_m_apply);
-SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply);
-SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1);
-
SCM
-scm_m_apply (SCM xorig, SCM env SCM_UNUSED)
+scm_m_quasiquote (SCM xorig, SCM env)
{
- SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2, scm_s_expression, s_atapply);
- return scm_cons (SCM_IM_APPLY, SCM_CDR (xorig));
+ SCM x = SCM_CDR (xorig);
+ SCM_ASSYNT (scm_ilength (x) == 1, scm_s_expression, s_quasiquote);
+ return iqq (SCM_CAR (x), env, 1);
}
-SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_makmmacro, scm_m_cont);
-SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc);
-
+SCM_SYNTAX (s_quote, "quote", scm_makmmacro, scm_m_quote);
+SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote);
-SCM
-scm_m_cont (SCM xorig, SCM env SCM_UNUSED)
+SCM
+scm_m_quote (SCM xorig, SCM env SCM_UNUSED)
{
- SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
- scm_s_expression, s_atcall_cc);
- return scm_cons (SCM_IM_CONT, SCM_CDR (xorig));
+ SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1, scm_s_expression, s_quote);
+ return scm_cons (SCM_IM_QUOTE, SCM_CDR (xorig));
}
-#if SCM_ENABLE_ELISP
-SCM_SYNTAX (s_nil_cond, "nil-cond", scm_makmmacro, scm_m_nil_cond);
+/* Will go into the RnRS module when Guile is factorized.
+SCM_SYNTAX (s_set_x, "set!", scm_makmmacro, scm_m_set_x); */
+static const char s_set_x[] = "set!";
+SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x);
SCM
-scm_m_nil_cond (SCM xorig, SCM env SCM_UNUSED)
+scm_m_set_x (SCM xorig, SCM env SCM_UNUSED)
{
- long len = scm_ilength (SCM_CDR (xorig));
- SCM_ASSYNT (len >= 1 && (len & 1) == 1, scm_s_expression, "nil-cond");
- return scm_cons (SCM_IM_NIL_COND, SCM_CDR (xorig));
+ SCM x = SCM_CDR (xorig);
+ SCM_ASSYNT (scm_ilength (x) == 2, scm_s_expression, s_set_x);
+ SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (x)), scm_s_variable, s_set_x);
+ return scm_cons (SCM_IM_SET_X, x);
}
-SCM_SYNTAX (s_atfop, "@fop", scm_makmmacro, scm_m_atfop);
-SCM
-scm_m_atfop (SCM xorig, SCM env SCM_UNUSED)
+/* Start of the memoizers for non-R5RS builtin macros. */
+
+
+SCM_SYNTAX (s_atapply, "@apply", scm_makmmacro, scm_m_apply);
+SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply);
+SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1);
+
+SCM
+scm_m_apply (SCM xorig, SCM env SCM_UNUSED)
{
- SCM x = SCM_CDR (xorig), var;
- SCM_ASSYNT (scm_ilength (x) >= 1, scm_s_expression, "@fop");
- var = scm_symbol_fref (SCM_CAR (x));
- /* Passing the symbol name as the `subr' arg here isn't really
- right, but without it it can be very difficult to work out from
- the error message which function definition was missing. In any
- case, we shouldn't really use SCM_ASSYNT here at all, but instead
- something equivalent to (signal void-function (list SYM)) in
- Elisp. */
- SCM_ASSYNT (SCM_VARIABLEP (var),
- "Symbol's function definition is void",
- SCM_SYMBOL_CHARS (SCM_CAR (x)));
- /* Support `defalias'. */
- while (SCM_SYMBOLP (SCM_VARIABLE_REF (var)))
- {
- var = scm_symbol_fref (SCM_VARIABLE_REF (var));
- SCM_ASSYNT (SCM_VARIABLEP (var),
- "Symbol's function definition is void",
- SCM_SYMBOL_CHARS (SCM_CAR (x)));
- }
- /* Use `var' here rather than `SCM_VARIABLE_REF (var)' because the
- former allows for automatically picking up redefinitions of the
- corresponding symbol. */
- SCM_SETCAR (x, var);
- /* If the variable contains a procedure, leave the
- `transformer-macro' in place so that the procedure's arguments
- get properly transformed, and change the initial @fop to
- SCM_IM_APPLY. */
- if (!SCM_MACROP (SCM_VARIABLE_REF (var)))
- {
- SCM_SETCAR (xorig, SCM_IM_APPLY);
- return xorig;
- }
- /* Otherwise (the variable contains a macro), the arguments should
- not be transformed, so cut the `transformer-macro' out and return
- the resulting expression starting with the variable. */
- SCM_SETCDR (x, SCM_CDADR (x));
- return x;
+ SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2, scm_s_expression, s_atapply);
+ return scm_cons (SCM_IM_APPLY, SCM_CDR (xorig));
}
-#endif /* SCM_ENABLE_ELISP */
/* (@bind ((var exp) ...) body ...)
SCM_CDDR (xorig)));
}
-SCM_SYNTAX (s_atslot_ref, "@slot-ref", scm_makmmacro, scm_m_atslot_ref);
+SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_makmmacro, scm_m_cont);
+SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc);
+
+
+SCM
+scm_m_cont (SCM xorig, SCM env SCM_UNUSED)
+{
+ SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
+ scm_s_expression, s_atcall_cc);
+ return scm_cons (SCM_IM_CONT, SCM_CDR (xorig));
+}
+
+
+SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_makmmacro, scm_m_at_call_with_values);
+SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values);
+
+SCM
+scm_m_at_call_with_values (SCM xorig, SCM env SCM_UNUSED)
+{
+ SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2,
+ scm_s_expression, s_at_call_with_values);
+ return scm_cons (SCM_IM_CALL_WITH_VALUES, SCM_CDR (xorig));
+}
+
+
+SCM_SYNTAX (s_future, "future", scm_makmmacro, scm_m_future);
+SCM_GLOBAL_SYMBOL (scm_sym_future, s_future);
+
+/* Like promises, futures are implemented as closures with an empty
+ * parameter list. Thus, (future <expression>) is transformed into
+ * (#@future '() <expression>), where the empty list represents the
+ * empty parameter list. This representation allows for easy creation
+ * of the closure during evaluation. */
+SCM
+scm_m_future (SCM xorig, SCM env SCM_UNUSED)
+{
+ SCM_ASSYNT (scm_ilength (xorig) == 2, scm_s_expression, s_future);
+ return scm_cons2 (SCM_IM_FUTURE, SCM_EOL, SCM_CDR (xorig));
+}
+
+
+SCM_SYNTAX (s_gset_x, "set!", scm_makmmacro, scm_m_generalized_set_x);
+SCM_SYMBOL (scm_sym_setter, "setter");
+
+SCM
+scm_m_generalized_set_x (SCM xorig, SCM env SCM_UNUSED)
+{
+ SCM x = SCM_CDR (xorig);
+ SCM_ASSYNT (2 == scm_ilength (x), scm_s_expression, s_set_x);
+ if (SCM_SYMBOLP (SCM_CAR (x)))
+ return scm_cons (SCM_IM_SET_X, x);
+ else if (SCM_CONSP (SCM_CAR (x)))
+ return scm_cons (scm_list_2 (scm_sym_setter, SCM_CAAR (x)),
+ scm_append (scm_list_2 (SCM_CDAR (x), SCM_CDR (x))));
+ else
+ scm_misc_error (s_set_x, scm_s_variable, SCM_EOL);
+}
+
+
+static const char* s_atslot_ref = "@slot-ref";
+
+/* @slot-ref is bound privately in the (oop goops) module from goops.c. As
+ * soon as the module system allows us to more freely create bindings in
+ * arbitrary modules during the startup phase, the code from goops.c should be
+ * moved here. */
SCM
scm_m_atslot_ref (SCM xorig, SCM env SCM_UNUSED)
#define FUNC_NAME s_atslot_ref
#undef FUNC_NAME
-SCM_SYNTAX (s_atslot_set_x, "@slot-set!", scm_makmmacro, scm_m_atslot_set_x);
+static const char* s_atslot_set_x = "@slot-set!";
+/* @slot-set! is bound privately in the (oop goops) module from goops.c. As
+ * soon as the module system allows us to more freely create bindings in
+ * arbitrary modules during the startup phase, the code from goops.c should be
+ * moved here. */
SCM
scm_m_atslot_set_x (SCM xorig, SCM env SCM_UNUSED)
#define FUNC_NAME s_atslot_set_x
#undef FUNC_NAME
-SCM_SYNTAX (s_atdispatch, "@dispatch", scm_makmmacro, scm_m_atdispatch);
+#if SCM_ENABLE_ELISP
-SCM_SYMBOL (sym_atdispatch, s_atdispatch);
+SCM_SYNTAX (s_nil_cond, "nil-cond", scm_makmmacro, scm_m_nil_cond);
SCM
-scm_m_atdispatch (SCM xorig, SCM env)
-#define FUNC_NAME s_atdispatch
+scm_m_nil_cond (SCM xorig, SCM env SCM_UNUSED)
{
- SCM args, n, v, gf, x = SCM_CDR (xorig);
- SCM_ASSYNT (scm_ilength (x) == 4, scm_s_expression, FUNC_NAME);
- args = SCM_CAR (x);
- if (!SCM_CONSP (args) && !SCM_SYMBOLP (args))
- SCM_WRONG_TYPE_ARG (SCM_ARG1, args);
- x = SCM_CDR (x);
- n = SCM_XEVALCAR (x, env);
- SCM_VALIDATE_INUM (SCM_ARG2, n);
- SCM_ASSERT_RANGE (0, n, SCM_INUM (n) >= 1);
- x = SCM_CDR (x);
- v = SCM_XEVALCAR (x, env);
- SCM_VALIDATE_VECTOR (SCM_ARG3, v);
- x = SCM_CDR (x);
- gf = SCM_XEVALCAR (x, env);
- SCM_VALIDATE_PUREGENERIC (SCM_ARG4, gf);
- return scm_list_5 (SCM_IM_DISPATCH, args, n, v, gf);
+ long len = scm_ilength (SCM_CDR (xorig));
+ SCM_ASSYNT (len >= 1 && (len & 1) == 1, scm_s_expression, "nil-cond");
+ return scm_cons (SCM_IM_NIL_COND, SCM_CDR (xorig));
}
-#undef FUNC_NAME
-SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_makmmacro, scm_m_at_call_with_values);
-SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values);
+SCM_SYNTAX (s_atfop, "@fop", scm_makmmacro, scm_m_atfop);
SCM
-scm_m_at_call_with_values (SCM xorig, SCM env SCM_UNUSED)
+scm_m_atfop (SCM xorig, SCM env SCM_UNUSED)
{
- SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2,
- scm_s_expression, s_at_call_with_values);
- return scm_cons (SCM_IM_CALL_WITH_VALUES, SCM_CDR (xorig));
+ SCM x = SCM_CDR (xorig), var;
+ SCM_ASSYNT (scm_ilength (x) >= 1, scm_s_expression, "@fop");
+ var = scm_symbol_fref (SCM_CAR (x));
+ /* Passing the symbol name as the `subr' arg here isn't really
+ right, but without it it can be very difficult to work out from
+ the error message which function definition was missing. In any
+ case, we shouldn't really use SCM_ASSYNT here at all, but instead
+ something equivalent to (signal void-function (list SYM)) in
+ Elisp. */
+ SCM_ASSYNT (SCM_VARIABLEP (var),
+ "Symbol's function definition is void",
+ SCM_SYMBOL_CHARS (SCM_CAR (x)));
+ /* Support `defalias'. */
+ while (SCM_SYMBOLP (SCM_VARIABLE_REF (var)))
+ {
+ var = scm_symbol_fref (SCM_VARIABLE_REF (var));
+ SCM_ASSYNT (SCM_VARIABLEP (var),
+ "Symbol's function definition is void",
+ SCM_SYMBOL_CHARS (SCM_CAR (x)));
+ }
+ /* Use `var' here rather than `SCM_VARIABLE_REF (var)' because the
+ former allows for automatically picking up redefinitions of the
+ corresponding symbol. */
+ SCM_SETCAR (x, var);
+ /* If the variable contains a procedure, leave the
+ `transformer-macro' in place so that the procedure's arguments
+ get properly transformed, and change the initial @fop to
+ SCM_IM_APPLY. */
+ if (!SCM_MACROP (SCM_VARIABLE_REF (var)))
+ {
+ SCM_SETCAR (xorig, SCM_IM_APPLY);
+ return xorig;
+ }
+ /* Otherwise (the variable contains a macro), the arguments should
+ not be transformed, so cut the `transformer-macro' out and return
+ the resulting expression starting with the variable. */
+ SCM_SETCDR (x, SCM_CDADR (x));
+ return x;
}
+#endif /* SCM_ENABLE_ELISP */
+
+
SCM
scm_m_expand_body (SCM xorig, SCM env)
{
RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env)));
- case (SCM_ISYMNUM (SCM_IM_DISPATCH)):
- {
- /* If not done yet, evaluate the operand forms. The result is a
- * list of arguments stored in arg1, which is used to perform the
- * function dispatch. */
- SCM operand_forms = SCM_CADR (x);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- if (SCM_ILOCP (operand_forms))
- arg1 = *scm_ilookup (operand_forms, env);
- else if (SCM_VARIABLEP (operand_forms))
- arg1 = SCM_VARIABLE_REF (operand_forms);
- else if (!SCM_CONSP (operand_forms))
- arg1 = *scm_lookupcar (SCM_CDR (x), env, 1);
- else
- {
- SCM tail = arg1 = scm_list_1 (EVALCAR (operand_forms, env));
- operand_forms = SCM_CDR (operand_forms);
- while (!SCM_NULLP (operand_forms))
- {
- SCM new_tail = scm_list_1 (EVALCAR (operand_forms, env));
- SCM_SETCDR (tail, new_tail);
- tail = new_tail;
- operand_forms = SCM_CDR (operand_forms);
- }
- }
- }
-
+ /* PLACEHOLDER for case (SCM_ISYMNUM (SCM_IM_DISPATCH)): The
+ following code (type_dispatch) is intended to be the tail
+ of the case clause for the internal macro
+ SCM_IM_DISPATCH. Please don't remove it from this
+ location without discussing it with Mikael
+ <djurfeldt@nada.kth.se> */
+
/* The type dispatch code is duplicated below
* (c.f. objects.c:scm_mcache_compute_cmethod) since that
* cuts down execution time for type dispatch to 50%. */
HCoop / bpt / guile.git / blobdiff