From ce5b453a449e4e7729abb5128114e2687f08360d Mon Sep 17 00:00:00 2001 From: Stefan Monnier Date: Mon, 19 Apr 2010 21:50:52 -0400 Subject: Make variable forwarding explicit rather the using special values. Basically, this makes the structure of buffer-local values and object forwarding explicit in the type of Lisp_Symbols rather than use special Lisp_Objects for that. This tends to lead to slightly more verbose code, but is more C-like, simpler, and makes it easier to make sure we handled all cases, among other things by letting the compiler help us check it. * lisp.h (enum Lisp_Misc_Type, union Lisp_Misc): Removing forwarding objects. (enum Lisp_Fwd_Type, enum symbol_redirect, union Lisp_Fwd): New types. (struct Lisp_Symbol): Make the various forms of variable-forwarding explicit rather than hiding them inside Lisp_Object "values". (XFWDTYPE): New macro. (XINTFWD, XBOOLFWD, XOBJFWD, XKBOARD_OBJFWD): Redefine. (XBUFFER_LOCAL_VALUE): Remove. (SYMBOL_VAL, SYMBOL_ALIAS, SYMBOL_BLV, SYMBOL_FWD, SET_SYMBOL_VAL) (SET_SYMBOL_ALIAS, SET_SYMBOL_BLV, SET_SYMBOL_FWD): New macros. (SYMBOL_VALUE, SET_SYMBOL_VALUE): Remove. (struct Lisp_Intfwd, struct Lisp_Boolfwd, struct Lisp_Objfwd) (struct Lisp_Buffer_Objfwd, struct Lisp_Kboard_Objfwd): Remove the Lisp_Misc_* header. (struct Lisp_Buffer_Local_Value): Redefine. (BLV_FOUND, SET_BLV_FOUND, BLV_VALUE, SET_BLV_VALUE): New macros. (struct Lisp_Misc_Any): Add filler to get the right size. (struct Lisp_Free): Use struct Lisp_Misc_Any rather than struct Lisp_Intfwd. (DEFVAR_LISP, DEFVAR_LISP_NOPRO, DEFVAR_BOOL, DEFVAR_INT) (DEFVAR_KBOARD): Allocate a forwarding object. * data.c (do_blv_forwarding, store_blv_forwarding): New macros. (let_shadows_global_binding_p): New function. (union Lisp_Val_Fwd): New type. (make_blv): New function. (swap_in_symval_forwarding, indirect_variable, do_symval_forwarding) (store_symval_forwarding, swap_in_global_binding, Fboundp) (swap_in_symval_forwarding, find_symbol_value, Fset) (let_shadows_buffer_binding_p, set_internal, default_value) (Fset_default, Fmake_variable_buffer_local, Fmake_local_variable) (Fkill_local_variable, Fmake_variable_frame_local) (Flocal_variable_p, Flocal_variable_if_set_p) (Fvariable_binding_locus): * xdisp.c (select_frame_for_redisplay): * lread.c (Fintern, Funintern, init_obarray, defvar_int) (defvar_bool, defvar_lisp_nopro, defvar_lisp, defvar_kboard): * frame.c (store_frame_param): * eval.c (Fdefvaralias, Fuser_variable_p, specbind, unbind_to): * bytecode.c (Fbyte_code) : Adapt to the new symbol value structure. * buffer.c (PER_BUFFER_SYMBOL): Move from buffer.h. (clone_per_buffer_values): Only adjust markers into the current buffer. (reset_buffer_local_variables): PER_BUFFER_IDX is never -2. (Fbuffer_local_value, set_buffer_internal_1) (swap_out_buffer_local_variables): Adapt to the new symbol value structure. (DEFVAR_PER_BUFFER): Allocate a Lisp_Buffer_Objfwd object. (defvar_per_buffer): Take a new arg for the fwd object. (buffer_lisp_local_variables): Return a proper alist (different fix for bug#4138). * alloc.c (Fmake_symbol): Use SET_SYMBOL_VAL. (Fgarbage_collect): Don't handle buffer_defaults specially. (mark_object): Handle new symbol value structure rather than the old special Lisp_Misc_* objects. (gc_sweep) : Free also the buffer-local-value objects. * term.c (set_tty_color_mode): * bidi.c (bidi_initialize): Don't access the ->value field directly. * buffer.h (PER_BUFFER_VAR_OFFSET): Don't bother with a buffer_local_flags. * print.c (print_object): Get rid of impossible forwarding objects. --- src/bytecode.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'src/bytecode.c') diff --git a/src/bytecode.c b/src/bytecode.c index e95614c72a9..c59f75dc78e 100644 --- a/src/bytecode.c +++ b/src/bytecode.c @@ -505,8 +505,9 @@ If the third argument is incorrect, Emacs may crash. */) v1 = vectorp[op]; if (SYMBOLP (v1)) { - v2 = SYMBOL_VALUE (v1); - if (MISCP (v2) || EQ (v2, Qunbound)) + if (XSYMBOL (v1)->redirect != SYMBOL_PLAINVAL + || (v2 = SYMBOL_VAL (XSYMBOL (v1)), + EQ (v2, Qunbound))) { BEFORE_POTENTIAL_GC (); v2 = Fsymbol_value (v1); @@ -597,10 +598,9 @@ If the third argument is incorrect, Emacs may crash. */) /* Inline the most common case. */ if (SYMBOLP (sym) && !EQ (val, Qunbound) - && !XSYMBOL (sym)->indirect_variable - && !SYMBOL_CONSTANT_P (sym) - && !MISCP (XSYMBOL (sym)->value)) - XSYMBOL (sym)->value = val; + && !XSYMBOL (sym)->redirect + && !SYMBOL_CONSTANT_P (sym)) + XSYMBOL (sym)->val.value = val; else { BEFORE_POTENTIAL_GC (); -- cgit v1.2.1