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* libguile/eval.c (scm_m_set_x, scm_m_apply, scm_m_atbind): Use
ASSERT_SYNTAX to signal syntax errors. Avoid unnecessary consing when creating the memoized code. (scm_m_atbind): Reversed the order, in which the init expressions are stored and executed. The order of execution is now equal to the order in which the initializers of the let-forms are executed. Use check_bindings and transform_bindings. (SCM_CEVAL): Eliminated SCM_NIMP in favor of more appropriate !SCM_NULLP. Added some comments. * test-suite/tests/dynamic-scope.test (exception:missing-expr): Introduced temporarily until all memoizers use the new way of error reporting.
This commit is contained in:
Dirk Herrmann
parent
216286857b
commit
82b3e2c612
4 changed files with 98 additions and 60 deletions
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@ -1,3 +1,17 @@
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2003-10-18 Dirk Herrmann <D.Herrmann@tu-bs.de>
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* eval.c (scm_m_set_x, scm_m_apply, scm_m_atbind): Use
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ASSERT_SYNTAX to signal syntax errors. Avoid unnecessary consing
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when creating the memoized code.
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(scm_m_atbind): Reversed the order, in which the init expressions
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are stored and executed. The order of execution is now equal to
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the order in which the initializers of the let-forms are executed.
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Use check_bindings and transform_bindings.
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(SCM_CEVAL): Eliminated SCM_NIMP in favor of more appropriate
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!SCM_NULLP. Added some comments.
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2003-10-18 Dirk Herrmann <D.Herrmann@tu-bs.de>
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* eval.c: Sorted include files alphabetically.
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128
libguile/eval.c
128
libguile/eval.c
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@ -1487,12 +1487,18 @@ static const char s_set_x[] = "set!";
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SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x);
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SCM
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scm_m_set_x (SCM xorig, SCM env SCM_UNUSED)
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scm_m_set_x (SCM expr, SCM env SCM_UNUSED)
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{
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SCM x = SCM_CDR (xorig);
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SCM_ASSYNT (scm_ilength (x) == 2, s_expression, s_set_x);
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SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (x)), s_variable, s_set_x);
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return scm_cons (SCM_IM_SET_X, x);
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SCM variable;
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const SCM cdr_expr = SCM_CDR (expr);
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ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
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ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr);
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variable = SCM_CAR (cdr_expr);
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ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr);
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SCM_SETCAR (expr, SCM_IM_SET_X);
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return expr;
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}
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@ -1504,64 +1510,69 @@ SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply);
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SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1);
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SCM
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scm_m_apply (SCM xorig, SCM env SCM_UNUSED)
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scm_m_apply (SCM expr, SCM env SCM_UNUSED)
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{
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SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2, s_expression, s_atapply);
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return scm_cons (SCM_IM_APPLY, SCM_CDR (xorig));
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const SCM cdr_expr = SCM_CDR (expr);
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ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
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ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr);
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SCM_SETCAR (expr, SCM_IM_APPLY);
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return expr;
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}
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/* (@bind ((var exp) ...) body ...)
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This will assign the values of the `exp's to the global variables
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named by `var's (symbols, not evaluated), creating them if they
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don't exist, executes body, and then restores the previous values of
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the `var's. Additionally, whenever control leaves body, the values
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of the `var's are saved and restored when control returns. It is an
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error when a symbol appears more than once among the `var's.
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All `exp's are evaluated before any `var' is set.
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Think of this as `let' for dynamic scope.
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It is memoized into (#@bind ((var ...) . (reversed-val ...)) body ...).
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XXX - also implement `@bind*'.
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*/
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SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind);
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/* FIXME: The following explanation should go into the documentation: */
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/* (@bind ((var init) ...) body ...) will assign the values of the `init's to
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* the global variables named by `var's (symbols, not evaluated), creating
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* them if they don't exist, executes body, and then restores the previous
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* values of the `var's. Additionally, whenever control leaves body, the
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* values of the `var's are saved and restored when control returns. It is an
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* error when a symbol appears more than once among the `var's. All `init's
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* are evaluated before any `var' is set.
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*
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* Think of this as `let' for dynamic scope.
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*/
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/* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into
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* (#@bind ((varn ... var1) . (exp1 ... expn)) body ...).
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*
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* FIXME - also implement `@bind*'.
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*/
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SCM
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scm_m_atbind (SCM xorig, SCM env)
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scm_m_atbind (SCM expr, SCM env)
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{
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SCM x = SCM_CDR (xorig);
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SCM top_level = scm_env_top_level (env);
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SCM vars = SCM_EOL, var;
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SCM exps = SCM_EOL;
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SCM bindings;
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SCM rvariables;
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SCM inits;
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SCM variable_idx;
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SCM_ASSYNT (scm_ilength (x) > 1, s_expression, s_atbind);
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const SCM top_level = scm_env_top_level (env);
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x = SCM_CAR (x);
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while (SCM_NIMP (x))
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const SCM cdr_expr = SCM_CDR (expr);
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ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
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ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr);
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bindings = SCM_CAR (cdr_expr);
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check_bindings (bindings, expr);
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transform_bindings (bindings, expr, &rvariables, &inits);
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for (variable_idx = rvariables;
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!SCM_NULLP (variable_idx);
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variable_idx = SCM_CDR (variable_idx))
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{
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SCM rest;
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SCM sym_exp = SCM_CAR (x);
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SCM_ASSYNT (scm_ilength (sym_exp) == 2, s_bindings, s_atbind);
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SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (sym_exp)), s_bindings, s_atbind);
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x = SCM_CDR (x);
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for (rest = x; SCM_NIMP (rest); rest = SCM_CDR (rest))
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if (SCM_EQ_P (SCM_CAR (sym_exp), SCM_CAAR (rest)))
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scm_misc_error (s_atbind, s_duplicate_bindings, SCM_EOL);
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/* The first call to scm_sym2var will look beyond the current
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module, while the second call wont. */
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var = scm_sym2var (SCM_CAR (sym_exp), top_level, SCM_BOOL_F);
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if (SCM_FALSEP (var))
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var = scm_sym2var (SCM_CAR (sym_exp), top_level, SCM_BOOL_T);
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vars = scm_cons (var, vars);
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exps = scm_cons (SCM_CADR (sym_exp), exps);
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/* The first call to scm_sym2var will look beyond the current module,
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* while the second call wont. */
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const SCM variable = SCM_CAR (variable_idx);
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SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F);
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if (SCM_FALSEP (new_variable))
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new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T);
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SCM_SETCAR (variable_idx, new_variable);
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}
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return scm_cons (SCM_IM_BIND,
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scm_cons (scm_cons (scm_reverse_x (vars, SCM_EOL), exps),
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SCM_CDDR (xorig)));
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SCM_SETCAR (expr, SCM_IM_BIND);
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SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits));
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return expr;
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}
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@ -3169,10 +3180,8 @@ dispatch:
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x = SCM_CDR (x);
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vars = SCM_CAAR (x);
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exps = SCM_CDAR (x);
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vals = SCM_EOL;
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while (SCM_NIMP (exps))
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while (!SCM_NULLP (exps))
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{
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vals = scm_cons (EVALCAR (exps, env), vals);
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exps = SCM_CDR (exps);
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@ -3206,9 +3215,15 @@ dispatch:
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proc = EVALCAR (x, env); /* proc is the consumer. */
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arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL);
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if (SCM_VALUESP (arg1))
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arg1 = scm_struct_ref (arg1, SCM_INUM0);
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{
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/* The list of arguments is not copied. Rather, it is assumed
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* that this has been done by the 'values' procedure. */
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arg1 = scm_struct_ref (arg1, SCM_INUM0);
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}
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else
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arg1 = scm_list_1 (arg1);
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{
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arg1 = scm_list_1 (arg1);
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}
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PREP_APPLY (proc, arg1);
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goto apply_proc;
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}
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@ -3221,6 +3236,7 @@ dispatch:
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default:
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proc = x;
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goto evapply;
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case scm_tc7_vector:
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case scm_tc7_wvect:
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#if SCM_HAVE_ARRAYS
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@ -1,3 +1,9 @@
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2003-10-18 Dirk Herrmann <D.Herrmann@tu-bs.de>
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* tests/dynamic-scope.test (exception:missing-expr): Introduced
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temporarily until all memoizers use the new way of error
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reporting.
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2003-10-18 Dirk Herrmann <D.Herrmann@tu-bs.de>
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* tests/syntax.test (exception:missing/extra-expr,
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@ -22,10 +22,12 @@
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:use-module (test-suite lib))
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(define exception:duplicate-binding
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(cons 'misc-error "^duplicate bindings"))
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(define exception:missing-expr
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(cons 'syntax-error "Missing expression"))
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(define exception:bad-binding
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(cons 'misc-error "^bad bindings"))
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(cons 'syntax-error "Bad binding"))
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(define exception:duplicate-binding
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(cons 'syntax-error "Duplicate binding"))
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(define global-a 0)
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(define (fetch-global-a) global-a)
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@ -47,7 +49,7 @@
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(interaction-environment)))
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(pass-if-exception "@bind missing expression"
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exception:missing-expression
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exception:missing-expr
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(eval '(@bind ((global-a 1)))
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(interaction-environment)))
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