794 lines
17 KiB
C
794 lines
17 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Ceriel J.H. Jacobs
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*/
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/* P A R S E T R E E W A L K E R */
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/* $Header$ */
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/* Routines to walk through parts of the parse tree, and generate
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code for these parts.
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*/
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#include "debug.h"
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#include <em_arith.h>
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#include <em_label.h>
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#include <em_reg.h>
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#include <em_code.h>
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#include <assert.h>
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#include "def.h"
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#include "type.h"
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#include "scope.h"
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#include "main.h"
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#include "LLlex.h"
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#include "node.h"
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#include "Lpars.h"
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#include "desig.h"
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#include "f_info.h"
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#include "idf.h"
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#include "chk_expr.h"
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#include "walk.h"
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#include "warning.h"
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extern arith NewPtr();
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extern arith NewInt();
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extern int proclevel;
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label text_label;
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label data_label;
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static struct type *func_type;
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struct withdesig *WithDesigs;
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struct node *Modules;
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static struct node *priority;
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#define NO_EXIT_LABEL ((label) 0)
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#define RETURN_LABEL ((label) 1)
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STATIC
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DoPriority()
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{
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/* For the time being (???), handle priorities by calls to
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the runtime system
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*/
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if (priority) {
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C_loc(priority->nd_INT);
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C_cal("_stackprio");
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C_asp(word_size);
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}
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}
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STATIC
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EndPriority()
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{
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if (priority) {
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C_cal("_unstackprio");
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}
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}
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STATIC
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DoProfil()
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{
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static label filename_label = 0;
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if (! options['L']) {
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if (!filename_label) {
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filename_label = ++data_label;
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C_df_dlb(filename_label);
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C_rom_scon(FileName, (arith) (strlen(FileName) + 1));
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}
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C_fil_dlb(filename_label, (arith) 0);
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}
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}
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WalkModule(module)
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register struct def *module;
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{
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/* Walk through a module, and all its local definitions.
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Also generate code for its body.
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This code is collected in an initialization routine.
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*/
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register struct scope *sc;
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struct scopelist *savevis = CurrVis;
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CurrVis = module->mod_vis;
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priority = module->mod_priority;
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sc = CurrentScope;
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/* Walk through it's local definitions
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*/
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WalkDef(sc->sc_def);
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/* Now, generate initialization code for this module.
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First call initialization routines for modules defined within
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this module.
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*/
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sc->sc_off = 0; /* no locals (yet) */
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text_label = 1; /* label at end of initialization routine */
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TmpOpen(sc); /* Initialize for temporaries */
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C_pro_narg(sc->sc_name);
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DoPriority();
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DoProfil();
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if (module == Defined) {
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/* Body of implementation or program module.
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Call initialization routines of imported modules.
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Also prevent recursive calls of this one.
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*/
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register struct node *nd = Modules;
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if (state == IMPLEMENTATION) {
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/* We don't actually prevent recursive calls,
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but do nothing if called recursively
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*/
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C_df_dlb(++data_label);
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C_con_cst((arith) 0);
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/* if this one is set to non-zero, the initialization
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was already done.
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*/
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C_loe_dlb(data_label, (arith) 0);
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C_zne(RETURN_LABEL);
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C_ine_dlb(data_label, (arith) 0);
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}
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for (; nd; nd = nd->next) {
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C_cal(nd->nd_IDF->id_text);
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}
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}
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MkCalls(sc->sc_def);
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proclevel++;
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WalkNode(module->mod_body, NO_EXIT_LABEL);
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DO_DEBUG(options['X'], PrNode(module->mod_body, 0));
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C_df_ilb(RETURN_LABEL);
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EndPriority();
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C_ret((arith) 0);
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C_end(-sc->sc_off);
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proclevel--;
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TmpClose();
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CurrVis = savevis;
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}
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WalkProcedure(procedure)
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register struct def *procedure;
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{
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/* Walk through the definition of a procedure and all its
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local definitions, checking and generating code.
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*/
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struct scopelist *savevis = CurrVis;
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register struct scope *sc = procedure->prc_vis->sc_scope;
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register struct type *tp;
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register struct paramlist *param;
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label func_res_label = 0;
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arith StackAdjustment = 0;
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arith retsav = 0;
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arith func_res_size = 0;
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proclevel++;
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CurrVis = procedure->prc_vis;
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/* Generate code for all local modules and procedures
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*/
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WalkDef(sc->sc_def);
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/* Generate code for this procedure
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*/
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C_pro_narg(sc->sc_name);
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DoPriority();
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DoProfil();
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TmpOpen(sc);
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func_type = tp = RemoveEqual(ResultType(procedure->df_type));
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if (tp && IsConstructed(tp)) {
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/* The result type of this procedure is constructed.
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The actual procedure will return a pointer to a global
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data area in which the function result is stored.
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Notice that this does make the code non-reentrant.
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Here, we create the data area for the function result.
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*/
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func_res_label = ++data_label;
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C_df_dlb(func_res_label);
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C_bss_cst(tp->tp_size, (arith) 0, 0);
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}
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if (tp) func_res_size = WA(tp->tp_size);
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/* Generate calls to initialization routines of modules defined within
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this procedure
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*/
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MkCalls(sc->sc_def);
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/* Make sure that arguments of size < word_size are on a
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fixed place.
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Also make copies of conformant arrays when neccessary.
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*/
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for (param = ParamList(procedure->df_type);
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param;
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param = param->next) {
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if (! IsVarParam(param)) {
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tp = TypeOfParam(param);
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if (! IsConformantArray(tp)) {
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if (tp->tp_size < word_size) {
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C_lol(param->par_def->var_off);
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C_lal(param->par_def->var_off);
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C_sti(tp->tp_size);
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}
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}
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else {
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/* Here, we have to make a copy of the
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array. We must also remember how much
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room is reserved for copies, because
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we have to adjust the stack pointer before
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a RET is done. This is even more complicated
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when the procedure returns a value.
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Then, the value must be saved (in retval),
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the stack adjusted, the return value pushed
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again, and then RET
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*/
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arith tmpvar = NewInt();
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if (! StackAdjustment) {
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/* First time we get here
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*/
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if (tp && !func_res_label) {
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/* Some local space, only
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needed if the value itself
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is returned
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*/
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sc->sc_off -= func_res_size;
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retsav = sc->sc_off;
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}
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StackAdjustment = NewInt();
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C_loc((arith) 0);
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C_stl(StackAdjustment);
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}
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/* First compute the size of the array */
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C_lol(param->par_def->var_off +
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pointer_size + word_size);
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/* upper - lower */
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C_inc(); /* gives number of elements */
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C_loc(tp->arr_elem->tp_size);
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C_mli(word_size);
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C_loc(word_size - 1);
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C_adi(word_size);
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C_loc(word_size);
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C_dvi(word_size);
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/* size in words */
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C_loc(word_size);
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C_mli(word_size);
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/* size in bytes */
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C_stl(tmpvar);
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C_lol(tmpvar);
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C_lol(tmpvar);
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C_lol(StackAdjustment);
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C_adi(word_size);
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C_stl(StackAdjustment);
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/* remember stack adjustments */
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C_ngi(word_size);
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/* Assumption: stack grows
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downwards!! ???
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*/
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C_ass(word_size);
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/* adjusted stack pointer */
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C_lol(param->par_def->var_off);
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/* push source address */
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C_lol(tmpvar); /* push size */
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C_cal("_load"); /* copy */
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C_asp(2 * word_size);
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C_lor((arith) 1);
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/* push new address of array
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... downwards ... ???
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*/
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C_stl(param->par_def->var_off);
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FreeInt(tmpvar);
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}
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}
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}
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text_label = 1; /* label at end of procedure */
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WalkNode(procedure->prc_body, NO_EXIT_LABEL);
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DO_DEBUG(options['X'], PrNode(procedure->prc_body, 0));
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C_df_ilb(RETURN_LABEL); /* label at end */
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tp = func_type;
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if (func_res_label) {
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/* Fill the data area reserved for the function result
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with the result
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*/
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C_lae_dlb(func_res_label, (arith) 0);
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C_sti(tp->tp_size);
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if (StackAdjustment) {
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/* Remove copies of conformant arrays
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*/
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C_lol(StackAdjustment);
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C_ass(word_size);
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}
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C_lae_dlb(func_res_label, (arith) 0);
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EndPriority();
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C_ret(pointer_size);
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}
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else if (tp) {
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if (StackAdjustment) {
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/* First save the function result in a safe place.
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Then remove copies of conformant arrays,
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and put function result back on the stack
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*/
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C_lal(retsav);
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C_sti(func_res_size);
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C_lol(StackAdjustment);
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C_ass(word_size);
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C_lal(retsav);
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C_loi(func_res_size);
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}
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EndPriority();
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C_ret(func_res_size);
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}
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else {
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if (StackAdjustment) {
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C_lol(StackAdjustment);
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C_ass(word_size);
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}
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EndPriority();
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C_ret((arith) 0);
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}
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if (StackAdjustment) FreeInt(StackAdjustment);
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if (! options['n']) RegisterMessages(sc->sc_def);
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C_end(-sc->sc_off);
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TmpClose();
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CurrVis = savevis;
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proclevel--;
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}
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WalkDef(df)
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register struct def *df;
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{
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/* Walk through a list of definitions
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*/
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for ( ; df; df = df->df_nextinscope) {
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switch(df->df_kind) {
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case D_MODULE:
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WalkModule(df);
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break;
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case D_PROCEDURE:
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WalkProcedure(df);
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break;
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case D_VARIABLE:
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if (!proclevel && !df->var_addrgiven) {
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C_df_dnam(df->var_name);
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C_bss_cst(
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WA(df->df_type->tp_size),
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(arith) 0, 0);
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}
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break;
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default:
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/* nothing */
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;
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}
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}
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}
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MkCalls(df)
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register struct def *df;
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{
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/* Generate calls to initialization routines of modules
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*/
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for ( ; df; df = df->df_nextinscope) {
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if (df->df_kind == D_MODULE) {
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C_lxl((arith) 0);
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C_cal(df->mod_vis->sc_scope->sc_name);
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C_asp(pointer_size);
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}
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}
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}
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WalkLink(nd, exit_label)
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register struct node *nd;
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label exit_label;
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{
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/* Walk node "nd", which is a link.
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*/
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while (nd && nd->nd_class == Link) { /* statement list */
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WalkNode(nd->nd_left, exit_label);
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nd = nd->nd_right;
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}
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WalkNode(nd, exit_label);
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}
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WalkCall(nd)
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register struct node *nd;
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{
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assert(nd->nd_class == Call);
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if (! options['L']) C_lin((arith) nd->nd_lineno);
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if (ChkCall(nd)) {
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if (nd->nd_type != 0) {
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node_error(nd, "procedure call expected");
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return;
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}
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CodeCall(nd);
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}
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}
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WalkStat(nd, exit_label)
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register struct node *nd;
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label exit_label;
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{
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/* Walk through a statement, generating code for it.
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*/
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register struct node *left = nd->nd_left;
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register struct node *right = nd->nd_right;
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assert(nd->nd_class == Stat);
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if (! options['L']) C_lin((arith) nd->nd_lineno);
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switch(nd->nd_symb) {
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case ';':
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break;
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case BECOMES:
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DoAssign(nd, left, right);
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break;
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case IF:
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{ label l1 = ++text_label, l3 = ++text_label;
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ExpectBool(left, l3, l1);
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assert(right->nd_symb == THEN);
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C_df_ilb(l3);
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WalkNode(right->nd_left, exit_label);
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if (right->nd_right) { /* ELSE part */
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label l2 = ++text_label;
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C_bra(l2);
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C_df_ilb(l1);
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WalkNode(right->nd_right, exit_label);
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C_df_ilb(l2);
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}
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else C_df_ilb(l1);
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break;
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}
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case CASE:
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CaseCode(nd, exit_label);
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break;
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case WHILE:
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{ label loop = ++text_label,
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exit = ++text_label,
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dummy = ++text_label;
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C_df_ilb(loop);
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ExpectBool(left, dummy, exit);
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C_df_ilb(dummy);
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WalkNode(right, exit_label);
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C_bra(loop);
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C_df_ilb(exit);
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break;
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}
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case REPEAT:
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{ label loop = ++text_label, exit = ++text_label;
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C_df_ilb(loop);
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WalkNode(left, exit_label);
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ExpectBool(right, exit, loop);
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C_df_ilb(exit);
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break;
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}
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case LOOP:
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{ label loop = ++text_label, exit = ++text_label;
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C_df_ilb(loop);
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WalkNode(right, exit);
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C_bra(loop);
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C_df_ilb(exit);
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break;
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}
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case FOR:
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{
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arith tmp = 0;
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register struct node *fnd;
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int good_forvar;
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label l1 = ++text_label;
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label l2 = ++text_label;
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good_forvar = DoForInit(nd, left);
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fnd = left->nd_right;
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if (fnd->nd_class != Value) {
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/* Upperbound not constant.
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The expression may only be evaluated once,
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so generate a temporary for it
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*/
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CodePExpr(fnd);
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tmp = NewInt();
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C_stl(tmp);
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}
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C_df_ilb(l1);
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C_dup(int_size);
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if (tmp) C_lol(tmp); else C_loc(fnd->nd_INT);
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if (left->nd_INT > 0) {
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C_bgt(l2);
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}
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else C_blt(l2);
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if (good_forvar) {
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RangeCheck(nd->nd_type, int_type);
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CodeDStore(nd);
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}
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WalkNode(right, exit_label);
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if (good_forvar) {
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CodePExpr(nd);
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C_loc(left->nd_INT);
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C_adi(int_size);
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C_bra(l1);
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C_df_ilb(l2);
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C_asp(int_size);
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}
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if (tmp) FreeInt(tmp);
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}
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break;
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case WITH:
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{
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struct scopelist link;
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struct withdesig wds;
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struct desig ds;
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if (! WalkDesignator(left, &ds)) break;
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if (left->nd_type->tp_fund != T_RECORD) {
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node_error(left, "record variable expected");
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break;
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}
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wds.w_next = WithDesigs;
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WithDesigs = &wds;
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wds.w_scope = left->nd_type->rec_scope;
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CodeAddress(&ds);
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ds.dsg_kind = DSG_FIXED;
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/* Create a designator structure for the temporary.
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*/
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ds.dsg_offset = NewPtr();
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ds.dsg_name = 0;
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CodeStore(&ds, pointer_size, pointer_align);
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ds.dsg_kind = DSG_PFIXED;
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/* the record is indirectly available */
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wds.w_desig = ds;
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link.sc_scope = wds.w_scope;
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link.next = CurrVis;
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CurrVis = &link;
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WalkNode(right, exit_label);
|
|
CurrVis = link.next;
|
|
WithDesigs = wds.w_next;
|
|
FreePtr(ds.dsg_offset);
|
|
break;
|
|
}
|
|
|
|
case EXIT:
|
|
assert(exit_label != 0);
|
|
|
|
C_bra(exit_label);
|
|
break;
|
|
|
|
case RETURN:
|
|
if (right) {
|
|
if (! ChkExpression(right)) break;
|
|
/* The type of the return-expression must be
|
|
assignment compatible with the result type of the
|
|
function procedure (See Rep. 9.11).
|
|
*/
|
|
if (!TstAssCompat(func_type, right->nd_type)) {
|
|
node_error(right, "type incompatibility in RETURN statement");
|
|
break;
|
|
}
|
|
if (right->nd_type->tp_fund == T_STRING) {
|
|
CodePString(right, func_type);
|
|
}
|
|
else CodePExpr(right);
|
|
}
|
|
C_bra(RETURN_LABEL);
|
|
break;
|
|
|
|
default:
|
|
crash("(WalkStat)");
|
|
}
|
|
}
|
|
|
|
extern int NodeCrash();
|
|
|
|
int (*WalkTable[])() = {
|
|
NodeCrash,
|
|
NodeCrash,
|
|
NodeCrash,
|
|
NodeCrash,
|
|
NodeCrash,
|
|
WalkCall,
|
|
NodeCrash,
|
|
NodeCrash,
|
|
NodeCrash,
|
|
NodeCrash,
|
|
WalkStat,
|
|
WalkLink,
|
|
NodeCrash
|
|
};
|
|
|
|
ExpectBool(nd, true_label, false_label)
|
|
register struct node *nd;
|
|
label true_label, false_label;
|
|
{
|
|
/* "nd" must indicate a boolean expression. Check this and
|
|
generate code to evaluate the expression.
|
|
*/
|
|
struct desig ds;
|
|
|
|
if (!ChkExpression(nd)) return;
|
|
|
|
if (nd->nd_type != bool_type && nd->nd_type != error_type) {
|
|
node_error(nd, "boolean expression expected");
|
|
}
|
|
|
|
ds = InitDesig;
|
|
CodeExpr(nd, &ds, true_label, false_label);
|
|
}
|
|
|
|
int
|
|
WalkExpr(nd)
|
|
register struct node *nd;
|
|
{
|
|
/* Check an expression and generate code for it
|
|
*/
|
|
|
|
if (! ChkExpression(nd)) return 0;
|
|
|
|
CodePExpr(nd);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
WalkDesignator(nd, ds)
|
|
struct node *nd;
|
|
struct desig *ds;
|
|
{
|
|
/* Check designator and generate code for it
|
|
*/
|
|
|
|
if (! ChkVariable(nd)) return 0;
|
|
|
|
*ds = InitDesig;
|
|
CodeDesig(nd, ds);
|
|
return 1;
|
|
}
|
|
|
|
DoForInit(nd, left)
|
|
register struct node *nd, *left;
|
|
{
|
|
register struct def *df;
|
|
|
|
nd->nd_left = nd->nd_right = 0;
|
|
nd->nd_class = Name;
|
|
nd->nd_symb = IDENT;
|
|
|
|
if (!( ChkVariable(nd) &
|
|
WalkExpr(left->nd_left) &
|
|
ChkExpression(left->nd_right))) return 0;
|
|
|
|
df = nd->nd_def;
|
|
if (df->df_kind == D_FIELD) {
|
|
node_error(nd,
|
|
"FOR-loop variable may not be a field of a record");
|
|
return 1;
|
|
}
|
|
|
|
if (!df->var_name && df->var_off >= 0) {
|
|
node_error(nd, "FOR-loop variable may not be a parameter");
|
|
return 1;
|
|
}
|
|
|
|
if (df->df_scope != CurrentScope) {
|
|
register struct scopelist *sc = CurrVis;
|
|
|
|
for (;;) {
|
|
if (!sc) {
|
|
node_error(nd,
|
|
"FOR-loop variable may not be imported");
|
|
return 1;
|
|
}
|
|
if (sc->sc_scope == df->df_scope) break;
|
|
sc = nextvisible(sc);
|
|
}
|
|
}
|
|
|
|
if (df->df_type->tp_size > word_size ||
|
|
!(df->df_type->tp_fund & T_DISCRETE)) {
|
|
node_error(nd, "illegal type of FOR loop variable");
|
|
return 1;
|
|
}
|
|
|
|
if (!TstCompat(df->df_type, left->nd_left->nd_type) ||
|
|
!TstCompat(df->df_type, left->nd_right->nd_type)) {
|
|
if (!TstAssCompat(df->df_type, left->nd_left->nd_type) ||
|
|
!TstAssCompat(df->df_type, left->nd_right->nd_type)) {
|
|
node_error(nd, "type incompatibility in FOR statement");
|
|
return 1;
|
|
}
|
|
node_warning(nd, W_OLDFASHIONED, "compatibility required in FOR statement");
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
DoAssign(nd, left, right)
|
|
struct node *nd;
|
|
register struct node *left, *right;
|
|
{
|
|
/* May we do it in this order (expression first) ???
|
|
The reference manual sais nothing about it, but the book does:
|
|
it sais that the left hand side is evaluated first.
|
|
DAMN THE BOOK!
|
|
*/
|
|
struct desig dsr;
|
|
register struct type *rtp, *ltp;
|
|
|
|
if (! (ChkExpression(right) & ChkVariable(left))) return;
|
|
rtp = right->nd_type;
|
|
ltp = left->nd_type;
|
|
|
|
if (right->nd_symb == STRING) TryToString(right, ltp);
|
|
dsr = InitDesig;
|
|
|
|
if (! TstAssCompat(ltp, rtp)) {
|
|
node_error(nd, "type incompatibility in assignment");
|
|
return;
|
|
}
|
|
|
|
#define StackNeededFor(ds) ((ds)->dsg_kind == DSG_PLOADED \
|
|
|| (ds)->dsg_kind == DSG_INDEXED)
|
|
CodeExpr(right, &dsr, NO_LABEL, NO_LABEL);
|
|
if (complex(rtp)) {
|
|
if (StackNeededFor(&dsr)) CodeAddress(&dsr);
|
|
}
|
|
else {
|
|
CodeValue(&dsr, rtp->tp_size, rtp->tp_align);
|
|
CodeCoercion(rtp, ltp);
|
|
RangeCheck(ltp, rtp);
|
|
}
|
|
CodeMove(&dsr, left, rtp);
|
|
}
|
|
|
|
RegisterMessages(df)
|
|
register struct def *df;
|
|
{
|
|
register struct type *tp;
|
|
|
|
for (; df; df = df->df_nextinscope) {
|
|
if (df->df_kind == D_VARIABLE && !(df->df_flags & D_NOREG)) {
|
|
/* Examine type and size
|
|
*/
|
|
tp = BaseType(df->df_type);
|
|
if ((df->df_flags & D_VARPAR) ||
|
|
(tp->tp_fund & (T_POINTER|T_HIDDEN|T_EQUAL))) {
|
|
C_ms_reg(df->var_off, pointer_size,
|
|
reg_pointer, 0);
|
|
}
|
|
else if (tp->tp_fund & T_NUMERIC) {
|
|
C_ms_reg(df->var_off,
|
|
tp->tp_size,
|
|
tp->tp_fund == T_REAL ?
|
|
reg_float : reg_any,
|
|
0);
|
|
}
|
|
}
|
|
}
|
|
}
|