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ack/lang/cem/cemcom.ansi/eval.c
George Koehler 007a63d529 Begin to add long long to C compiler for linux386. 
Add long long type, but without literals; you can't say '123LL' yet.
You can try constant operations, like `(long long)123 + 1`, but the
compiler's `arith` type might not be wide enough.  Conversions,
shifts, and some other operations don't work in i386 ncg; I am using a
union instead of conversions:

	union q {
		long long ll;
		unsigned long long ull;
		int i[2];
	};

Hack plat/linux386/descr to enable long long (size 8, alignment 4)
only for this platform.  The default for other platforms is to disable
long long (size -1).

In lang/cem/cemcom.ansi,

 - BigPars, SmallPars: Add default size, alignment of long long.
 - align.h: Add lnglng_align.
 - arith.c: Convert arithmetic operands to long long or unsigned long
   long when necessary; avoid conversion from long long to long.
   Allow long long as an arithmetic, integral, or logical operand.
 - ch3.c: Handle long long like int and long when erroneously applying
   a selector, like `long long ll; ll.member` or `ll->member`.  Add
   long long to integral and arithmetic types.
 - code.c: Add long long to type stabs for debugging.
 - conversion.c: Add long long to integral conversions.
 - cstoper.c: Write masks up to full_mask[8].  Add FIXME comment.
 - declar.g: Parse `long long` in code.
 - decspecs.c: Understand long long in type declarations.
 - eval.c: Add long long to operations, to generate code like `adi 8`.
   Don't use `ldc` with constant over 4 bytes.
 - ival.g: Allow long long in initializations.
 - main.c: Set lnglng_type and related values.
 - options.c: Add option like `-Vq8.4` to set long long to size 8,
   alignment 4.  I chose 'q', because Perl's pack and Ruby's
   Array#pack use 'q' for 64-bit or long long values; it might be a
   reference to BSD's old quad_t alias for long long.
 - sizes.h: Add lnglng_size.
 - stab.c: Allow long long when writing the type stab for debugging.
   Switch from calculating the ranges to hardcoding them in strings;
   add 8-byte ranges as a special case.  This also hardcodes the
   unsigned 4-byte range as "0;-1".  Before it was either "0;-1" or
   "0;4294967295", depending on sizeof(long) in the compiler.
 - struct.c: Try long long bitfield, but it will probably give the
   error, "bit field type long long does not fit in a word".
 - switch.c: Update comment.
 - tokenname.c: Define LNGLNG (long long) like LNGDBL (long double).
 - type.c, type.str: Add lnglng_type and ulnglng_type.  Add function
   no_long_long() to check if long long is disabled.
2019-09-02 11:24:44 -04:00

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/*
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*/
/* $Id$ */
/* EXPRESSION-CODE GENERATOR */
#include "parameters.h"
#ifndef LINT
#include <assert.h>
#include <ack_string.h>
#include <em.h>
#include <em_reg.h>
#include <alloc.h>
#include <flt_arith.h>
#include "interface.h"
#include "eval.h"
#include "idf.h"
#include "arith.h"
#include "type.h"
#include "label.h"
#include "code.h"
#include "def.h"
#include "expr.h"
#include "sizes.h"
#include "field.h"
#include "Lpars.h"
#include "level.h"
#include "conversion.h"
#include "stack.h"
#include "struct.h"
#include "align.h"
#include "mes.h"
#include "atw.h"
#include "ch3.h"
#include "util.h"
#include "blocks.h"
#include "dataflow.h"
#include "specials.h"
#include "error.h"
#define CRASH() crash("EVAL: CRASH at line %u", __LINE__)
char *symbol2str();
arith NewLocal(); /* util.c */
#define LocalPtrVar() NewLocal(pointer_size, pointer_align, reg_pointer, REGISTER)
extern int err_occurred; /* error.c */
/* Forward internal declarations */
static void operands(register struct expr *, int);
static void ptr_add(arith size);
static void truthvalue(int relop);
static void compare(int relop, label lbl);
/* EVAL() is the main expression-tree evaluator, which turns
any legal expression tree into EM code. parameters.h:
struct expr *expr
pointer to root of the expression tree to be evaluated
int val
indicates whether the resulting expression is to be
dereferenced (if val == RVAL and expr->ex_lvalue == 1)
or not (val == LVAL). The latter case indicates that
the resulting expression is an lvalue expression which
should not be dereferenced by EVAL
int code
indicates whether the expression tree must be turned
into EM code or not. E.g. the expression statement "12;"
delivers the expression "12" to EVAL while this should
not result in any EM code
label false_label, label true_label
if the expression is a logical or relational expression
and if the loop of the program depends on the resulting
value then EVAL generates jumps to the specified program
labels, in case they are specified (i.e. are non-zero)
*/
void EVAL(register struct expr *expr, int val, int code, label true_label, label false_label)
{
int vol = (code != TRUE && recurqual(expr->ex_type, TQ_VOLATILE));
register int gencode = code == TRUE;
if (err_occurred) return;
switch (expr->ex_class) {
case Value: /* just a simple value */
if (gencode) {
if (true_label) {
/* can only result from ','-expressions with
constant right-hand sides ???
*/
assert(is_cp_cst(expr));
C_bra(expr->VL_VALUE == 0 ? false_label : true_label);
}
else load_val(expr, val);
}
else if (vol) {
load_val(expr, val);
C_asp(ATW(expr->ex_type->tp_size));
}
break;
case String: /* a string constant */
if (gencode) {
string2pointer(expr);
C_lae_dlb(expr->VL_LBL, expr->VL_VALUE);
}
break;
case Float: /* a floating constant */
if (gencode) {
label datlab = data_label();
char buf[FLT_STRLEN];
fp_used = 1;
flt_flt2str(&(expr->FL_ARITH), buf, FLT_STRLEN);
C_df_dlb(datlab);
C_rom_fcon(buf, expr->ex_type->tp_size);
C_lae_dlb(datlab, (arith)0);
C_loi(expr->ex_type->tp_size);
}
break;
case Oper: /* compound expression */
{
int oper = expr->OP_OPER;
register struct expr *left = expr->OP_LEFT;
register struct expr *right = expr->OP_RIGHT;
register struct type *tp = expr->OP_TYPE;
switch (oper) {
case '+':
/* We have the following possibilities :
int + int, pointer + int, pointer + long,
long + long, long long + long long,
double + double
*/
operands(expr, gencode);
if (gencode) {
switch (tp->tp_fund) {
case INT:
case LONG:
case LNGLNG:
if (tp->tp_unsigned)
C_adu(tp->tp_size);
else
C_adi(tp->tp_size);
break;
case POINTER:
ptr_add(right->ex_type->tp_size);
break;
case FLOAT:
case DOUBLE:
case LNGDBL:
C_adf(tp->tp_size);
break;
default:
crash("bad type +");
}
}
break;
case '-':
if (left == 0) { /* unary */
EVAL(right, RVAL, gencode, NO_LABEL, NO_LABEL);
if (gencode) {
switch (tp->tp_fund) {
case INT:
case LONG:
case LNGLNG:
case POINTER:
C_ngi(tp->tp_size);
break;
case FLOAT:
case DOUBLE:
case LNGDBL:
C_ngf(tp->tp_size);
break;
default:
CRASH();
}
}
break;
}
/* else binary; we have the following flavours:
int - int, pointer - int, pointer - long,
pointer - pointer, long - long,
long long - long long, double - double
*/
operands(expr, gencode);
if (!gencode)
break;
switch (tp->tp_fund) {
case INT:
case LONG:
case LNGLNG:
if (tp->tp_unsigned)
C_sbu(tp->tp_size);
else
C_sbi(tp->tp_size);
break;
case POINTER:
if (right->ex_type->tp_fund == POINTER)
C_sbs(pointer_size);
else {
C_ngi(right->ex_type->tp_size);
ptr_add(right->ex_type->tp_size);
}
break;
case FLOAT:
case DOUBLE:
case LNGDBL:
C_sbf(tp->tp_size);
break;
default:
crash("bad type -");
}
break;
case '*':
if (left == 0) { /* unary */
EVAL(right, RVAL, gencode, NO_LABEL, NO_LABEL);
if (gencode && right->ex_class == String) {
C_loi((arith)1);
}
break;
}
operands(expr, gencode);
if (gencode) {
switch (tp->tp_fund) {
case INT:
case LONG:
case LNGLNG:
case POINTER:
if (tp->tp_unsigned)
C_mlu(tp->tp_size);
else
C_mli(tp->tp_size);
break;
case FLOAT:
case DOUBLE:
case LNGDBL:
C_mlf(tp->tp_size);
break;
default:
crash("bad type *");
}
}
break;
case '/':
operands(expr, gencode);
if (gencode)
switch (tp->tp_fund) {
case INT:
case LONG:
case LNGLNG:
case POINTER:
if (tp->tp_unsigned)
C_dvu(tp->tp_size);
else
C_dvi(tp->tp_size);
break;
case FLOAT:
case DOUBLE:
case LNGDBL:
/*C_dvf(double_size);*/
C_dvf(tp->tp_size);
break;
default:
crash("bad type /");
}
break;
case '%':
operands(expr, gencode);
assert(tp->tp_fund==INT || tp->tp_fund==LONG ||
tp->tp_fund==LNGLNG);
if (gencode)
if (tp->tp_unsigned)
C_rmu(tp->tp_size);
else
C_rmi(tp->tp_size);
break;
case LEFT:
operands(expr, gencode);
if (gencode)
if (tp->tp_unsigned)
C_slu(tp->tp_size);
else
C_sli(tp->tp_size);
break;
case RIGHT:
operands(expr, gencode);
if (gencode)
if (tp->tp_unsigned)
C_sru(tp->tp_size);
else
C_sri(tp->tp_size);
break;
case '<':
case LESSEQ:
case '>':
case GREATEREQ:
case EQUAL:
case NOTEQUAL:
operands(expr, gencode);
if (gencode) {
/* The operands have the same type */
arith size = left->ex_type->tp_size;
switch (tp->tp_fund) {
case INT:
case LONG:
case LNGLNG:
if (left->ex_type->tp_unsigned)
C_cmu(size);
else
C_cmi(size);
break;
case FLOAT:
case DOUBLE:
case LNGDBL:
C_cmf(size);
break;
case POINTER:
C_cmp();
break;
case ENUM:
C_cmi(size);
break;
default:
CRASH();
}
if (true_label != 0) {
compare(oper, true_label);
C_bra(false_label);
}
else {
truthvalue(oper);
}
}
break;
case '&':
case '|':
case '^':
/* both operands should have type int */
operands(expr, gencode);
if (gencode) {
arith size = tp->tp_size;
if ((int)size < (int)word_size)
size = word_size;
switch (oper) {
case '&':
C_and(size);
break;
case '|':
C_ior(size);
break;
case '^':
C_xor(size);
break;
}
}
break;
case '=':
#ifndef NOBITFIELD
if (left->ex_type->tp_fund == FIELD) {
eval_field(expr, gencode);
break;
}
#endif /* NOBITFIELD */
if (is_struct_or_union(tp->tp_fund) && ! gencode) {
EVAL(right, LVAL, TRUE, NO_LABEL, NO_LABEL);
EVAL(left, LVAL, TRUE, NO_LABEL, NO_LABEL);
copy_block(tp->tp_size, tp->tp_align);
break;
}
EVAL(right, RVAL, TRUE, NO_LABEL, NO_LABEL);
if (gencode && val == RVAL)
C_dup(ATW(tp->tp_size));
if (left->ex_class != Value) {
EVAL(left, LVAL, TRUE, NO_LABEL, NO_LABEL);
if (gencode && val == LVAL) {
arith tmp = LocalPtrVar();
C_dup(pointer_size);
StoreLocal(tmp, pointer_size);
store_block(tp->tp_size, tp->tp_align);
LoadLocal(tmp, pointer_size);
FreeLocal(tmp);
}
else store_block(tp->tp_size, tp->tp_align);
}
else {
store_val(&(left->EX_VALUE), left->ex_type);
if (gencode && val == LVAL) {
EVAL(left, LVAL, TRUE, NO_LABEL, NO_LABEL);
}
}
break;
case PLUSAB:
case MINAB:
case TIMESAB:
case DIVAB:
case MODAB:
case LEFTAB:
case RIGHTAB:
case ANDAB:
case XORAB:
case ORAB:
case POSTINCR:
case POSTDECR:
case PLUSPLUS:
case MINMIN:
{
arith tmp = 0;
int compl; /* Complexity of left operand */
int right_done = 0;
int dupval;
#ifndef NOBITFIELD
if (left->ex_type->tp_fund == FIELD) {
eval_field(expr, gencode);
break;
}
#endif /* NOBITFIELD */
if (left->ex_class == Value) {
compl = 0; /* Value */
}
else if (left->ex_depth == 1 &&
!(left->ex_flags & EX_SIDEEFFECTS)) {
compl = 1;
}
else compl = 2;
/* evaluate right-hand side first when possible,
but not for POSTINCR or PLUSPLUS, because then
we might miss a chance for increment instructions.
*/
if (compl != 2 &&
tp->tp_fund != POINTER &&
(oper == PLUSAB || oper == TIMESAB ||
oper == ANDAB || oper == XORAB || oper == ORAB)) {
right_done = 1;
EVAL(right, RVAL, TRUE, NO_LABEL, NO_LABEL);
}
if (compl == 0) {
load_val(left, RVAL);
}
else
if (compl == 1) {
EVAL(left, RVAL, TRUE, NO_LABEL, NO_LABEL);
}
else {
EVAL(left, LVAL, TRUE, NO_LABEL, NO_LABEL);
tmp = LocalPtrVar();
C_dup(pointer_size);
StoreLocal(tmp, pointer_size);
C_loi(left->ex_type->tp_size);
}
if (gencode && (oper == POSTINCR ||
oper == POSTDECR))
C_dup(ATW(left->ex_type->tp_size));
conversion(left->ex_type, tp);
if (! right_done) {
EVAL(right, RVAL, TRUE, NO_LABEL, NO_LABEL);
}
dupval = gencode && oper != POSTINCR &&
oper != POSTDECR;
assop(tp, oper);
conversion(tp, left->ex_type);
if (compl == 0) {
store_val(&(left->EX_VALUE),
left->ex_type);
if (dupval) load_val(left, RVAL);
}
else if (compl == 1) {
EVAL(left, LVAL, TRUE, NO_LABEL, NO_LABEL);
C_sti(left->ex_type->tp_size);
if (dupval) {
EVAL(left, LVAL, TRUE, NO_LABEL, NO_LABEL);
C_loi(left->ex_type->tp_size);
}
}
else {
LoadLocal(tmp, pointer_size);
C_sti(left->ex_type->tp_size);
if (dupval) {
LoadLocal(tmp, pointer_size);
C_loi(left->ex_type->tp_size);
}
FreeLocal(tmp);
}
break;
}
case '(':
{
register struct expr *ex;
arith ParSize = (arith)0;
label setjmp_label = 0;
arith retspace = 0;
if (ISNAME(left)) {
if (left->VL_IDF->id_special == SP_SETJMP) {
label addr_label = data_label();
setjmp_label = text_label();
C_df_dlb(addr_label);
C_rom_ilb(setjmp_label);
C_lae_dlb(addr_label, (arith) 0);
C_loi(pointer_size);
ParSize += pointer_size;
}
}
if ((ex = right) != NILEXPR) {
/* function call with parameters*/
while ( ex->ex_class == Oper &&
ex->OP_OPER == PARCOMMA
) {
EVAL(ex->OP_RIGHT, RVAL, TRUE,
NO_LABEL, NO_LABEL);
ParSize += ATW(ex->OP_RIGHT->ex_type->tp_size);
ex = ex->OP_LEFT;
}
EVAL(ex, RVAL, TRUE, NO_LABEL, NO_LABEL);
ParSize += ATW(ex->ex_type->tp_size);
}
if (is_struct_or_union(tp->tp_fund)) {
retspace = NewLocal(tp->tp_size, tp->tp_align,
-1, 0);
C_lal(retspace);
ParSize += pointer_size;
}
if (ISNAME(left)) {
/* e.g., main() { (*((int (*)())0))(); } */
C_cal(left->VL_IDF->id_text);
if (setjmp_label) {
C_df_ilb(setjmp_label);
}
#ifdef DATAFLOW
{ extern char options[];
if (options['d'])
DfaCallFunction(
left->VL_IDF->id_text);
}
#endif /* DATAFLOW */
}
else {
EVAL(left, LVAL, TRUE, NO_LABEL, NO_LABEL);
C_cai();
}
/* remove parameters from stack */
if (ParSize > (arith)0)
C_asp(ParSize);
if (gencode) {
if (is_struct_or_union(tp->tp_fund)) {
C_lfr(pointer_size);
if (val == RVAL) {
load_block(tp->tp_size, (int) word_size);
FreeLocal(retspace);
}
}
else
C_lfr(ATW(tp->tp_size));
}
if (tp->tp_fund == FLOAT || tp->tp_fund == DOUBLE
|| tp->tp_fund == LNGDBL)
fp_used = 1;
/* ??? set filename and line number ??? */
break;
}
case '.':
case ARROW:
if (tp->tp_fund == FLOAT || tp->tp_fund == DOUBLE
|| tp->tp_fund == LNGDBL)
fp_used = 1;
EVAL(left, oper == '.' ? LVAL : RVAL, gencode,
NO_LABEL, NO_LABEL);
assert(is_cp_cst(right));
if (gencode) {
C_adp(right->VL_VALUE);
}
break;
case ',':
EVAL(left, RVAL, FALSE, NO_LABEL, NO_LABEL);
EVAL(right, val, gencode, true_label, false_label);
break;
case '~':
EVAL(right, RVAL, gencode, NO_LABEL, NO_LABEL);
if (gencode)
C_com(tp->tp_size);
break;
case '?': /* must be followed by ':' */
{
label l_true = text_label();
label l_false = text_label();
label l_end = text_label();
EVAL(left, RVAL, TRUE, l_true, l_false);
C_df_ilb(l_true);
EVAL(right->OP_LEFT, val, gencode, NO_LABEL, NO_LABEL);
C_bra(l_end);
C_df_ilb(l_false);
EVAL(right->OP_RIGHT, val, gencode, NO_LABEL, NO_LABEL);
C_df_ilb(l_end);
break;
}
case OR:
case AND: {
label l_false, l_true, l_maybe;
l_maybe = text_label();
if (true_label) {
l_false = false_label;
l_true = true_label;
}
else {
l_false = text_label();
l_true = gencode ? text_label(): l_false;
}
EVAL(left, RVAL, TRUE, oper == AND ? l_maybe : l_true,
oper == AND ? l_false : l_maybe);
C_df_ilb(l_maybe);
EVAL(right, RVAL, gencode, l_true, l_false);
if (gencode && !true_label) {
label l_end = text_label();
C_df_ilb(l_true);
C_loc((arith)1);
C_bra(l_end);
C_df_ilb(l_false);
C_loc((arith)0);
C_df_ilb(l_end);
}
else {
if (! true_label) C_df_ilb(l_false);
}
}
break;
case '!':
if (true_label == 0) {
EVAL(right, RVAL, gencode, NO_LABEL, NO_LABEL);
if (gencode) {
C_teq();
}
}
else
EVAL(right, RVAL, gencode, false_label,
true_label);
break;
case INT2INT:
case INT2FLOAT:
case FLOAT2INT:
case FLOAT2FLOAT:
EVAL(right, RVAL, gencode, NO_LABEL, NO_LABEL);
if (gencode)
conversion(right->ex_type, left->ex_type);
break;
default:
crash("(EVAL) bad operator %s\n", symbol2str(oper));
}
/* If the rvalue of the expression is required but
only its lvalue is evaluated, its rvalue is
loaded by the following statements:
*/
if (gencode && val == RVAL && expr->ex_lvalue == 1) {
if (expr->ex_type->tp_fund == FLOAT
|| expr->ex_type->tp_fund == DOUBLE
|| expr->ex_type->tp_fund == LNGDBL)
fp_used = 1;
load_block(expr->ex_type->tp_size,
expr->ex_type->tp_align);
}
break;
}
default:
crash("(EVAL) bad expression class");
}
if (val == RVAL && ((expr->ex_flags & EX_VOLATILE) || vol)) C_nop();
}
/* compare() serves as an auxiliary function of EVAL */
static void compare(int relop, label lbl)
{
switch (relop) {
case '<':
C_zlt(lbl);
break;
case LESSEQ:
C_zle(lbl);
break;
case '>':
C_zgt(lbl);
break;
case GREATEREQ:
C_zge(lbl);
break;
case EQUAL:
C_zeq(lbl);
break;
case NOTEQUAL:
C_zne(lbl);
break;
default:
CRASH();
}
}
/* truthvalue() serves as an auxiliary function of EVAL */
static void truthvalue(int relop)
{
switch (relop) {
case '<':
C_tlt();
break;
case LESSEQ:
C_tle();
break;
case '>':
C_tgt();
break;
case GREATEREQ:
C_tge();
break;
case EQUAL:
C_teq();
break;
case NOTEQUAL:
C_tne();
break;
default:
CRASH();
}
}
/* assop() generates the opcode of an assignment operators op= */
void assop(register struct type *type, int oper)
{
register arith size;
register int uns = type->tp_unsigned;
if ((int)(size = type->tp_size) < (int)word_size)
size = word_size;
switch (type->tp_fund) {
case CHAR:
case SHORT:
case INT:
case LONG:
case LNGLNG:
case ENUM:
switch (oper) {
case PLUSAB:
case PLUSPLUS:
case POSTINCR:
if (uns)
C_adu(size);
else
C_adi(size);
break;
case MINAB:
case MINMIN:
case POSTDECR:
if (uns)
C_sbu(size);
else
C_sbi(size);
break;
case TIMESAB:
if (uns)
C_mlu(size);
else
C_mli(size);
break;
case DIVAB:
if (uns)
C_dvu(size);
else
C_dvi(size);
break;
case MODAB:
if (uns)
C_rmu(size);
else
C_rmi(size);
break;
case LEFTAB:
if (uns)
C_slu(size);
else
C_sli(size);
break;
case RIGHTAB:
if (uns)
C_sru(size);
else
C_sri(size);
break;
case ANDAB:
C_and(size);
break;
case XORAB:
C_xor(size);
break;
case ORAB:
C_ior(size);
break;
}
break;
case FLOAT:
case DOUBLE:
case LNGDBL:
switch (oper) {
case PLUSAB:
case PLUSPLUS: /* ??? etc... */
case POSTINCR:
C_adf(size);
break;
case MINAB:
case MINMIN:
case POSTDECR:
C_sbf(size);
break;
case TIMESAB:
C_mlf(size);
break;
case DIVAB:
C_dvf(size);
break;
}
break;
case POINTER:
if (oper == MINAB || oper == MINMIN || oper == POSTDECR)
C_ngi(size);
ptr_add(size);
break;
default:
crash("(assop) bad type %s\n", symbol2str(type->tp_fund));
}
}
static void ptr_add(arith size)
{
if (size != pointer_size) {
C_loc(size);
C_loc(pointer_size);
C_cuu();
}
C_ads(pointer_size);
}
/* store_val() generates code for a store operation.
There are four ways of storing data:
- into a global variable
- into an automatic local variable
- into a local static variable
- absolute addressing
*/
void store_val(register struct value *vl, register struct type *tp)
{
register int inword = 0;
register int indword = 0;
arith val = vl->vl_value;
if (vl->vl_class == Const) { /* absolute addressing */
load_cst(val, pointer_size);
store_block(tp->tp_size, tp->tp_align);
return;
}
if (tp->tp_align % word_align == 0) {
if (tp->tp_size == word_size) inword = 1;
else if (tp->tp_size == dword_size) indword = 1;
}
if (vl->vl_class == Name) {
register struct idf *id = vl->vl_data.vl_idf;
register struct def *df = id->id_def;
/* if (df->df_level == L_GLOBAL) { // } ??? re-examine */
if (df->df_sc == GLOBAL
|| df->df_sc == EXTERN
|| df->df_sc == STATIC) {
if (inword)
C_ste_dnam(id->id_text, val);
else
if (indword)
C_sde_dnam(id->id_text, val);
else {
C_lae_dnam(id->id_text, val);
store_block(tp->tp_size, tp->tp_align);
}
}
else {
assert(df->df_sc != STATIC);
if (inword || indword)
StoreLocal(df->df_address + val, tp->tp_size);
else {
AddrLocal(df->df_address + val);
store_block(tp->tp_size, tp->tp_align);
}
}
}
else {
label dlb = vl->vl_data.vl_lbl;
assert(vl->vl_class == Label);
if (inword)
C_ste_dlb(dlb, val);
else
if (indword)
C_sde_dlb(dlb, val);
else {
C_lae_dlb(dlb, val);
store_block(tp->tp_size, tp->tp_align);
}
}
}
/* load_val() generates code for stacking a certain value (from ex),
which can be obtained in one of the following ways:
- value from absolute addressed memory
- constant value
- function result
- global variable
- static variable
- local variable
rlval generate rlval or lval
*/
void load_val(register struct expr *expr, int rlval)
{
register struct type *tp = expr->ex_type;
int rvalue = (rlval == RVAL && expr->ex_lvalue != 0);
register int inword = 0, indword = 0;
register arith val = expr->VL_VALUE;
if (expr->ex_type->tp_fund == FLOAT
|| expr->ex_type->tp_fund == DOUBLE
|| expr->ex_type->tp_fund == LNGDBL)
fp_used = 1;
if (expr->VL_CLASS == Const) {
if (rvalue) { /* absolute addressing */
load_cst(val, pointer_size);
load_block(tp->tp_size, tp->tp_align);
}
else /* integer, unsigned, long, enum etc */
load_cst(val, tp->tp_size);
return;
}
if (rvalue) {
if (tp->tp_align % word_align == 0) {
if (tp->tp_size == word_size) inword = 1;
else if (tp->tp_size == dword_size) indword = 1;
}
}
if (expr->VL_CLASS == Label) {
if (rvalue) {
if (inword)
C_loe_dlb(expr->VL_LBL, val);
else
if (indword)
C_lde_dlb(expr->VL_LBL, val);
else {
C_lae_dlb(expr->VL_LBL, val);
load_block(tp->tp_size, tp->tp_align);
}
}
else {
C_lae_dlb(expr->VL_LBL, (arith)0);
C_adp(val);
}
}
else {
register struct idf *id = expr->VL_IDF;
register struct def *df = id->id_def;
int fund = df->df_type->tp_fund;
assert(ISNAME(expr));
if (fund == FUNCTION) {
/* the previous statement tried to catch a function
identifier, which may be cast to a pointer to a
function.
assert(!(rvalue)); ???
*/
C_lpi(id->id_text);
}
else
/* if (df->df_level == L_GLOBAL) { // } ??? re-examine */
if ( df->df_sc == GLOBAL
|| df->df_sc == STATIC
|| df->df_sc == EXTERN) {
if (rvalue) {
if (inword)
C_loe_dnam(id->id_text, val);
else
if (indword)
C_lde_dnam(id->id_text, val);
else {
C_lae_dnam(id->id_text, val);
load_block(tp->tp_size, tp->tp_align);
}
}
else {
C_lae_dnam(id->id_text, (arith)0);
C_adp(val);
}
}
else {
/* assert(df->df_sc != STATIC); */
if (rvalue) {
if (inword || indword)
LoadLocal(df->df_address + val, tp->tp_size);
else {
AddrLocal(df->df_address + val);
load_block(tp->tp_size, tp->tp_align);
}
}
else {
AddrLocal(df->df_address);
C_adp(val);
}
}
}
}
void load_cst(arith val, arith siz)
{
/* EM can't encode ldc with constant over 4 bytes.
Such a constant must go into rom.
*/
if ((int)siz <= (int)word_size)
C_loc(val);
else
if ((int)siz == (int)dword_size && (int)dword_size <= 4)
C_ldc(val);
else {
label datlab;
C_df_dlb(datlab = data_label());
C_rom_icon(long2str((long)val, 10), siz);
C_lae_dlb(datlab, (arith)0);
C_loi(siz);
}
}
static void operands(register struct expr *expr, int gencode)
{
EVAL(expr->OP_LEFT, RVAL, gencode, NO_LABEL, NO_LABEL);
EVAL(expr->OP_RIGHT, RVAL, gencode, NO_LABEL, NO_LABEL);
}
#endif /* LINT */
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