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part31.c
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/*
* File part31.c created 14.08.2021, last modified 11.11.2021.
*
* The part31.c file is part of the restored optimization program
* from the Hi-Tech C compiler v3.09 package.
*
* Andrey Nikitin & Mark Ogden 11.11.2021
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include "optim1.h"
int regTestMasks[] = {
0x01, /* 6cb2 REG_B */
0x02, /* 6cb4 REG_C */
0x04, /* 6cb6 REG_D */
0x08, /* 6cb8 REG_E */
0x10, /* 6cba REG_H */
0x20, /* 6cbc REG_L */
0x40, /* 6cbe REG_F */
0x80, /* 6cc0 REG_A */
0x00, /* 6cc2 REG_I */
0x00, /* 6cc4 REG_R */
0x03, /* 6cc6 REG_BC */
0x0C, /* 6cc8 REG_DE */
0x30, /* 6cca REG_HL */
0x00, /* 6ccc REG_SP */
0xC0, /* 6cce REG_AF */
0x00, /* 6cd0 REG_AF1 */
0x100, /* 6cd2 REG_IX */
0x200, /* 6cd4 REG_IY */
};
/**************************************************************************
50 rel_err ok++
**************************************************************************/
void rel_err() {
pr_warning("Relocation error");
}
/**************************************************************************
51 sub_3856 ok++ (PMO) except for one jp z, that is optimised to jr z,
**************************************************************************/
operand_t *evalOperand() {
register operand_t *oper;
oper = allocOperand();
switch (tokType) {
case T_EOL:
oper->type = T_INVALID;
break;
case T_REG:
if (expectCond && yylval.i == REG_C) { /* check if C is used in jp c context */
tokType = T_COND; /* convert to condition */
yylval.i = COND_LLT;
}
/* fall through */
case T_COND:
oper->type = tokType; /* save type, value and prep for next token */
oper->aux = (uint8_t)yylval.i;
tokType = get_token();
break;
case T_OPAR:
if ((tokType = get_token()) == T_REG) {
if (yylval.i != REG_C && yylval.i < REG_BC) { /* only (C) and (BC) onwards are valid */
oper_err();
}
oper->type = T_REGREF;
oper->aux = (uint8_t)yylval.i; /* save reg id */
if ((tokType = get_token()) == T_CPAR) { /* simple (reg) so prep for next token */
tokType = get_token();
break;
}
if (oper->aux < REG_IX) { /* only IX & IY are allowed expressions */
oper_err();
}
oper->type = T_INDEXED; /* is IX/IY +/- d operand */
} else {
oper->type = T_ADDRREF; /* is a (addr) operand */
}
oper->term = *evalExpr(); /* get the expression */
if (tokType != T_CPAR) { /* should now be the closing ) */
oper_err();
}
tokType = get_token(); /* prep for next token */
/* IX & IY are only allowed displacements -128 to 127 */
if (oper->type == T_INDEXED && (oper->oVal < -128 || oper->oVal >= 128)) {
pr_warning("Index offset too large");
}
break;
/*
the operands below are only valid as the last operand on a line
so there is no preping for the next token
*/
case T_FWD:
case T_BWD:
oper->type = tokType;
oper->oVal = yylval.i; /* save the label reference number */
break;
default:
oper->type = T_CONST;
oper->term = *evalExpr(); /* allow for more complex expression */
}
return oper;
}
/**************************************************************************
52 oper_err ok++ (PMO) but note jmpbuf not set
**************************************************************************/
void oper_err() {
pr_warning("Operand error");
longjmp(jmpbuf, 1); /* BUG: jmpbuf not set */
}
/**************************************************************************
53 sub_39a3 ok++ (PMO)
**************************************************************************/
void getOperands(register inst_t *pi) {
tokType = get_token();
cntOperand = 0;
pi->iLhs = NULL;
pi->iRhs = NULL;
if (tokType == T_COMM) {
oper_err(); /* cannot start with a comma */
}
if (tokType != T_EOL) { /* no operands */
pi->iLhs = evalOperand();
if (tokType == T_COMM) { /* if comma then 2nd operand */
tokType = get_token();
pi->iRhs = evalOperand();
++cntOperand;
}
++cntOperand;
}
clr_len_inbuf();
}
/**************************************************************************
54 sub_3a15 ok++ (PMO)
**************************************************************************/
void loadFunction() {
sym_t *ps;
inst_t *l2;
inst_t *l3;
int fpBase;
register inst_t *pi;
pi = root = (inst_t *)alloc_mem(sizeof(inst_t));
pi->pNext = (inst_t *)alloc_mem(sizeof(inst_t));
HEAP(pi->pNext);
pi->pNext->pAlt = pi;
pi = pi->pNext;
l2 = switchVectors = word_6fee = (inst_t *)alloc_mem(sizeof(inst_t));
for (;; HEAP(pi->iRhs)) {
tokType = get_token();
HEAP(pi->iRhs);
for (;; HEAP(pi->pNext)) {
if (tokType == T_EOL) {
clr_len_inbuf();
break;
}
if (pi->type != T_INVALID) {
pi = allocInst(pi); /* m3: */
}
if (tokType == -1) { /* m4: */
word_6ffc = pi;
word_6fee = l2;
return;
}
pi->type = tokType; /* m5: */
if (psect == SWDATA) {
if (tokType == T_DEFW) { /* collect the switch table */
pi->opCode = yytext;
getOperands(pi);
l2->pNext = pi;
pi = pi->pAlt;
pi->pNext = NULL;
l2->pNext->pAlt = l2;
l2 = l2->pNext;
break;
}
psect = DATA; /* revert to normal data handling */
}
switch (pi->type = tokType) { /* m7: */
case T_CONST:
if ((psect == DATA) || (psect == BSS)) {
pi->type = T_INVALID;
pr_psect(psect);
printf("%d:\n", yylval.i);
} else {
pi->aux = yylval.i; /* m10: */
l3 = pi->pAlt;
if (pi->pAlt->type == T_JP && l3->iLhs->type == T_FWD && l3->iLhs->oVal == pi->aux) {
removeInstruction(l3);
}
}
tokType = get_token(); /* m11: */
if (tokType != T_COLN) {
pr_error("Bad temp label");
}
break;
case T_SYMBOL:
ps = yylval.pSym;
pi->aux = 0;
tokType = get_token();
if (tokType == T_EQU) {
if (ps->label[0] != 'f') { /* compiler generated equ names begin with f */
pr_error("Unknown EQU");
}
pi->type = T_INVALID;
tokType = get_token();
pi->iLhs = evalOperand();
/* check is constant with no unresolved symbol ref */
if (pi->iLhs->type != T_CONST || pi->iLhs->oPSym) {
pr_error("Bad arg to EQU");
}
fpBase = pi->iLhs->oVal; /* the frame pointer offset to lowest local (will be 0 or -ve) */
word_6ffc = pi;
word_6fee = l2;
pi = root;
do { /* update any references to the frame size */
if (pi->iRhs && pi->iRhs->type == T_CONST && pi->iRhs->oPSym == ps) {
pi->iRhs->oVal += fpBase;
pi->iRhs->oPSym = NULL;
}
if (pi->iLhs && pi->iLhs->type == T_CONST && pi->iLhs->oPSym == ps) {
pi->iLhs->oVal += fpBase;
pi->iLhs->oPSym = NULL;
}
} while (pi = pi->pNext);
return;
}
pi->iPSym = ps;
ps->p.pInst = pi;
pi->aux = INT_MAX;
if (psect == DATA && ps->label[0] == 'S') { /* compiler generated switch tables start with S */
psect = SWDATA;
l2->pNext = pi;
pi = pi->pAlt;
pi->pNext = NULL;
l2->pNext->pAlt = l2;
l2 = l2->pNext;
}
if (psect == DATA || psect == BSS) {
pi->type = T_INVALID;
pi->iLhs = NULL;
ps->p.pInst = NULL;
pr_psect(psect);
printf("%s:\n", ps->label);
} else if (ps->label[0] == '_') { /* external name */
name_fun = ps->label;
}
if (tokType == T_COLN) {
break;
}
continue; /* inner loop */
case 255: /* -1 */
pi->type = T_INVALID;
word_6ffc = pi;
return;
case T_DEFW:
case T_DEFB:
if (psect == TEXT) {
goto case_default;
}
case T_DEFM:
case T_DEFS:
case T_DEFF:
if (psect == TEXT) {
pr_error("DEF[BMSF] in text psect");
}
pr_psect(psect);
/* fall through */
case T_GLB:
printf("%s\t%s\n", yytext, ptr_token());
pi->type = T_INVALID;
break;
case T_PSCT:
psect = num_psect(ptr_token()); /* m30: */
pi->type = T_INVALID;
break;
case T_JR:
pi->type = T_JP; /* convert to jp so it is safe to move code */
yytext = "jp";
/* fall through */
default:
case_default:
pi->opCode = yytext;
pi->aux = yylval.i;
if (tokType == T_JP || tokType == T_CALL) { /* set if can have conditional */
expectCond = true;
} else {
expectCond = false;
}
getOperands(pi);
if ((pi->type == T_JP) || (pi->type == T_CALL)) {
if (pi->iLhs->type == T_COND) { /* if cond then hoist condition and remove lhs */
pi->aux = pi->iLhs->aux;
pi->iLhs = pi->iRhs;
pi->iRhs = NULL;
}
}
if (pi->type == T_JP && pi->aux == 0 && pi->iLhs->type != T_REGREF &&
(l3 = pi->pAlt)->type == T_CONST && l3->pAlt->type == T_JP && l3->pAlt->aux == 0) {
while (l3 = l3->pAlt) {
if (l3->type == T_JP && l3->iLhs->type == T_FWD && l3->iLhs->oVal == pi->pAlt->aux) {
*l3->iLhs = *pi->iLhs;
} else if (l3->type == T_CONST && l3->aux == pi->pAlt->aux) {
break;
}
}
removeInstruction(pi->pAlt);
freeOperand(pi->iLhs);
pi->type = T_INVALID;
pi->iLhs = NULL;
pi->opCode = NULL;
}
break;
}
break; /* to outer loop */
}
}
}
/**************************************************************************
55 sub_4000 ok++ (PMO)
**************************************************************************/
bool sub_4000(register inst_t const *pi) {
return pi->type == T_JP && pi->iLhs->oPSym && strcmp(pi->iLhs->oPSym->label, "cret") == 0;
}
/**************************************************************************
56 sub_404d ok++ (PMO) Used in: optimise
**************************************************************************/
void sub_404d() {
register inst_t *pi;
if (root->pNext) {
pr_psect(TEXT);
for (pi = root->pNext; pi; pi = pi->pNext) {
if (pi->type == T_CALL && strcmp(pi->iLhs->oPSym->label, "ncsv") == 0) {
pi = pi->pNext;
if (pi->type != T_DEFW) { /* "defw" */
pr_error("Expecting defw after call ncsv");
}
if (pi->iLhs->oVal == 0) {
if (usesIXorIY) {
printf("global csv\ncall csv\n");
}
} else {
usesIXorIY = true;
if (pi->iLhs->oVal >= -4) {
printf("global csv\ncall csv\npush hl\n");
if (pi->iLhs->oVal < -2) {
printf("push hl\n");
}
} else {
printf("call ncsv\ndefw %d\n", pi->iLhs->oVal);
}
}
} else if (!usesIXorIY && sub_4000(pi)) {
pi->type = T_RET;
pi->opCode = NULL;
pr_instruction(pi);
} else if (!usesIXorIY && pi->type == T_CALL && pi->aux == 0 && pi->pNext->aux == 0 &&
sub_4000(pi->pNext) && pi->iLhs->oPSym->label[0] == '_') {
pi->type = T_JP; /* "jp" */
pi->opCode = NULL;
pr_instruction(pi);
pi = pi->pNext;
} else {
pr_instruction(pi);
}
}
}
if (switchVectors->pNext) {
pr_psect(DATA);
for (pi = switchVectors->pNext; pi; pi = pi->pNext) {
pr_instruction(pi);
}
}
}
/**************************************************************************
57 pr_instruction sub_420a ok++ (PMO)
*
* benign differences
* 1) printf call/return code is shared
* 2) fputc('\n', stdout) is located differently
**************************************************************************/
void pr_instruction(register inst_t *pi) {
if (pi->type == T_INVALID)
;
else if (pi->type == T_SYMBOL) {
if ((pi->iPSym->label[0])) {
printf("%s:\n", pi->iPSym->label);
} else {
printf("L%d:\n", pi->iSymId);
}
} else if (pi->type == T_CONST) { /* m4: */
printf("%d:\n", pi->aux); /* OPTIMISER[1]: shares printf call with above*/
} else if (key_f && pi->type == T_CALL && strcmp(pi->iLhs->oPSym->label, "csv") == 0) {
printf("push\tiy\npush\tix\nld\tix,0\nadd\tix,sp\n");
} else {
if (key_n) {
fputc('\t', stdout); /* m7: */
}
pr_token(pi);
if (pi->type == T_JP || pi->type == T_CALL || pi->type == T_RET) {
fputc('\t', stdout);
if (pi->aux != 0) {
printf("%s", conditions[pi->aux]);
}
if (pi->type != T_RET) {
if (pi->aux != 0) {
fputc(',', stdout);
}
sub_436e(pi->iLhs); /* m11: */
}
} else if (pi->iLhs) { /* m14: */
fputc('\t', stdout);
sub_436e(pi->iLhs);
if (pi->iRhs) {
fputc(',', stdout);
sub_436e(pi->iRhs);
}
}
fputc('\n', stdout); /* OPTIMISER: minor movement in where this is located also optimises return */
}
}
/**************************************************************************
58 sub_436e ok++ (PMO)
Same except optimiser misses the optimisation of fputc(')', stdout)
**************************************************************************/
void sub_436e(register operand_t const *pi) {
HEAP(pi);
switch (pi->type) {
case T_INDEXED:
case T_ADDRREF:
fputc('(', stdout);
if (pi->type == T_INDEXED) {
if (pi->aux == REG_IX) {
printf("ix");
} else {
printf("iy");
}
fputc('+', stdout);
}
case T_CONST:
if (pi->oPSym) {
if (pi->oPSym->label[0]) {
printf("%s", pi->oPSym->label);
} else {
printf("L%d", pi->oPSym->p.pInst->iSymId);
}
if (0 < pi->oVal) {
fputc('+', stdout);
}
}
if (pi->oVal != 0 || !pi->oPSym) {
printf("%d", pi->oVal);
}
if (pi->type != T_CONST) {
fputc(')', stdout);
}
break;
case T_REGREF:
fputc('(', stdout);
case T_REG:
printf("%s", regs[pi->aux]);
if (pi->type == T_REGREF) {
fputc(')', stdout); /* OPTIMISER[1]: misses optimising htis with same fputc above */
}
break;
case T_FWD:
printf("%df", pi->oVal);
break;
default:
pr_error("Bad operand");
break;
}
HEAP(pi);
}
/**************************************************************************
59 sub_44b2 ok++ (PMO)
Optimiser saves some code with minor changes to code for regValues[18]
original replacement
ld a,(regValues + 6ch) ld hl,regvalues + 6ch ; test regValues[18].type
or a ld a,(hl)
jp z,cret or a
push iy jp z,cret
ld hl,regVales + 6ch push iy
push hl push hl ; ®Values[18]
The replacement code is slightly short
**************************************************************************/
void sub_44b2(register operand_t const *po) {
int n;
while ((n = sub_46b1(po, REG_B)) != -1) {
sub_4544(n);
}
while ((n = sub_46b1(po, REG_BC)) != -1) {
sub_4544(n);
}
if (regValues[17].type && operandsSame(po, ®Values[17])) {
sub_4544(17);
}
if (regValues[REG_TRACKER].type && operandsSame(®Values[REG_TRACKER], po)) {
regValues[REG_TRACKER].type = T_INVALID;
}
}
/**************************************************************************
60 sub_4544 ok++ (PMO)
*
* Optimiser generates marginally less efficient code for regValues[18]
* access it chooses to use hl and (hl) rather than the load directly
* to/from a code functionally is the same
**************************************************************************/
void sub_4544(int reg) {
register operand_t *pi;
regValues[reg].type = T_INVALID;
if (regTestMasks[REG_HL] & regTestMasks[reg]) {
hlDelta = 0;
regValues[REG_TRACKER].type = T_INVALID;
}
if (pi = regHiLoValMap[reg].pHiRegVal) {
pi->type = T_INVALID;
if (pi = regHiLoValMap[reg].pLoRegVal) {
pi->type = T_INVALID;
}
}
if (reg != 17) {
return;
}
for (pi = regValues; pi < ®Values[REG_TRACKER]; ++pi)
if (pi->type == T_INDEXED && pi->aux == REG_IY) {
pi->type = T_INVALID;
}
if (regValues[REG_TRACKER].type == T_INDEXED && regValues[REG_TRACKER].aux == REG_IY) {
regValues[REG_TRACKER].type = T_INVALID;
}
}
/**************************************************************************
61 sub_4601 ok+
*
* Generates correct code, but different from original
**************************************************************************/
void sub_4601() {
register operand_t *po;
for (po = regValues; po < ®Values[REG_TRACKER]; ++po) {
po->type = T_INVALID;
}
regValues[REG_TRACKER].type = T_INVALID;
}
/**************************************************************************
62 sub_4625 ok+
*
* Generates correct code, but in a sequence different from original
**************************************************************************/
bool sub_4625(register inst_t const *pi) {
switch (pi->type) {
case T_LD:
case T_STK:
return true;
case T_INCDEC:
return pi->iLhs->type == T_REG && pi->iLhs->aux >= REG_BC;
case T_EX:
return pi->iLhs->aux != REG_AF;
}
return false;
}
/**************************************************************************
63 sub_4682 ok++
**************************************************************************/
bool sub_4682(register operand_t const *pi) {
return pi->type == T_CONST && !pi->oPSym && pi->oVal == 0;
}
/**************************************************************************
64 sub_46b1 ok++
**************************************************************************/
int sub_46b1(register operand_t const *opr, int reg) {
operand_t *po;
int i;
po = reg < REG_BC ? ®Values[REG_B] : ®Values[REG_BC];
do {
if (po->type) {
if (operandsSame(po, opr)) {
i = (int)(po - regValues);
if (i >= REG_BC && reg < REG_BC) {
return regHiLoMap[i].loReg;
}
return i;
}
}
} while (++po < ®Values[REG_SP]);
return -1;
}
/**************************************************************************
65 sub_475c ok++
**************************************************************************/
int sub_475c(register operand_t const *po, int p2) {
if (!po) {
return false;
}
if (po->type != T_REG && po->type != T_INDEXED && po->type != T_REGREF) {
return false;
}
if (p2 & regTestMasks[po->aux]) {
return true;
}
return false;
}
/**************************************************************************
66 sub_47a2 ok++
**************************************************************************/
int sub_47a2(register operand_t const *po, int p2) {
if (!po) {
return false;
}
if (po->type != T_REG) {
return false;
}
if (p2 & regTestMasks[po->aux]) {
return true;
}
return false;
}
/**************************************************************************
67 sub_47e0 ok++ (PMO)
*
* Optimiser differences
* 1) The code for case 0 is detected as the same as the code in case T_JP
* and reused
* 2) There are two instances where the test cases are reversed along with
* the associated jumps. Leaving the logic the same
**************************************************************************/
bool sub_47e0(int reg, register inst_t const *pi1, inst_t const *pi2) {
uint16_t msk;
sym_t *ps;
inst_t *l3;
int n; /* number of iterations */
if (reg == REG_SP || reg == REG_IX) {
return true;
}
if (REG_BC <= reg && reg <= REG_HL) {
if (sub_47e0(regHiLoMap[reg].hiReg, pi1, pi2)) {
return true;
}
reg = regHiLoMap[reg].loReg;
}
if (reg >= sizeof(regTestMasks) / sizeof(regTestMasks[0])) {
fprintf(stderr, "%d\n", reg);
}
/* #pragma warning(suppress : 6385) /* reg has limited values */
msk = regTestMasks[reg]; /* m3: */
n = 40;
do {
switch (pi1->type) {
case T_CALL:
if (pi1->aux != 0 && (msk & 0x40)) {
return true;
}
if (reg == REG_IY) {
break;
}
if (!pi1->iLhs->oPSym || pi1->iLhs->oPSym->label[0] == '_') {
return false;
}
if (!(msk & 0xBF)) {
return false;
} else {
return true;
}
case T_JP:
if (pi1->aux != 0 || pi1->iLhs->type == T_REGREF || !(ps = pi1->iLhs->oPSym)) {
return true;
}
if (!(l3 = ps->p.pInst))
if (strcmp(ps->label, "cret") != 0) {
return true;
} else if (msk & 0x3C) { /* code reused */
return true;
} else {
return false;
}
pi1 = l3;
break;
case T_SIMPLE:
switch (pi1->aux) { /* m14: */
case 0: /* "nop" */
case I_CPL:
case I_SCF:
case I_CCF:
case I_NEG:
case I_HALT:
case I_DI:
case I_EI:
break;
case I_EXX:
while ((pi1 = pi1->pNext) && (pi1->type != T_SIMPLE || pi1->aux != I_EXX))
if (pi1->type != T_LD && pi1->type != T_STK && pi1->type != T_CADD) {
return false;
}
if (!pi1) {
return false;
}
break;
default:
if (msk & 0x80) {
return true;
}
break;
}
break;
case T_TWOBYTE:
if (reg != 17) {
return true;
}
break;
case T_3:
if (pi1->aux == I_XOR) /* m22: */
if (pi1->iLhs->type == T_REG && pi1->iLhs->aux == REG_A && reg == REG_A) {
return false;
}
if (msk & 0x80) {
return true; /* m23: */
}
if (msk & 0x40) {
return false;
}
if (sub_475c(pi1->iLhs, msk)) { /* OPTIMISER[1]: see below */
return true;
}
break;
case T_SHIFT:
if ((pi1->aux & 0xFFE7) != 0x20 && (msk & 0x40)) {
return true;
}
case T_INCDEC:
if ((msk & 0x40) && (pi1->iLhs->type != T_REG || pi1->iLhs->aux < REG_BC)) {
return false;
}
if (pi1->iLhs->type == T_REG || sub_475c(pi1->iLhs, msk)) {
return true;
}
break;
case T_BIT: /* "set", "res", "bit" */
if (pi1->aux == 0x40 && (msk & 0x40)) {
return false;
}
case T_0xF: /* 0xF */
if (sub_475c(pi1->iRhs, msk) || sub_475c(pi1->iLhs, msk)) {
return true;
}
break;
case T_5:
break;
case T_DJNZ:
if (msk & 1) {
return true;
}
break;
case T_0xE:
if (sub_475c(pi1->iRhs, msk)) {
return true;
}
if (sub_47a2(pi1->iLhs, msk)) {
return false;
}
break;
case T_STK:
if (pi1->aux == I_PUSH && (msk & regTestMasks[pi1->iLhs->aux])) {
return true;
}
if (msk & regTestMasks[pi1->iLhs->aux]) {
return false;
}
break;
case T_EX:
if (pi1->iLhs->type == T_REGREF && (msk & regTestMasks[pi1->iRhs->aux])) {
return true;
}
if (msk & 0x3C) {
return true;
}
break;
case T_CADD:
if (msk & 0x40) {
return false;
}
case T_CARR: /* Add, sub with Carry */
if ((regTestMasks[pi1->iLhs->aux] | 0x40) & msk) {
return true;
}
if (sub_475c(pi1->iRhs, msk)) {
return true;
}
break;
case T_LD:
if (!operandsSame(pi1->iLhs, pi1->iRhs))
if (sub_475c(pi1->iRhs, msk)) {
return true;
} else if (sub_47a2(pi1->iLhs, msk)) {
return false;
} else if (sub_475c(pi1->iLhs, msk)) {
return true;
}
break;
case 0: /* OPTIMISER[2]: optimised to reuse code in T_JP */
if (msk & 0x3C) {
return true;
} else {
return false;
}
case T_JR:
case T_RET:
case T_RST:
break;
}
pi1 = pi1->pNext;
if (pi2 == pi1) {
return false;
}
} while (n-- != 0);
return true;
}
/**************************************************************************
68 sub_4c33 ok++ (PMO) Used in: sub_4cf0, sub_4da7
**************************************************************************/
sym_t *allocItem() {
register sym_t *ps;
ps = (sym_t *)freeItemList; /* check the free list*/
if (ps) { /* if there is an entry release it*/
freeItemList = ((list_t *)ps)->pNext;
ps->label = NULL;
ps->p.pInst = NULL;
return ps;
}
return (sym_t *)alloc_mem(sizeof(sym_t)); /* else allocate a new one */
}
/**************************************************************************
69 sub_4c6b ok+
**************************************************************************/
void freeSymbol(register sym_t *ps) {
if (strlen(ps->label) >= sizeof(sym_t)) { /* if string could be reused as a symbol at it to the free list*/
((list_t *)(ps->label))->pNext = freeItemList;
freeItemList = (list_t *)(ps->label);
}
((list_t *)ps)->pNext = freeItemList; /* add the symbol to the free list */
freeItemList = (list_t *)ps;
}
/**************************************************************************
70 hash_index sub_4cab ok++ Used in: sub_4cf0
**************************************************************************/
int hash_index(register char const *s, int size) {
uint16_t hash;
for (hash = 0; *s != 0; ++s) {
hash += *(uint8_t *)s + hash;
}
return hash % size;
}
/**************************************************************************
71 sub_4cf0 ok++ (PMO) Used in: get_token
**************************************************************************/
sym_t *lookupSym(register char const *s) {
sym_t **pps;
sym_t *ps;
pps = &hashtab[hash_index(s, HASHSIZE)];
while (*pps && strcmp((*pps)->label, s))
if (++pps == &hashtab[HASHSIZE]) {
pps = hashtab;
}
if (ps = *pps) {
return ps;
}
*pps = ps = allocItem();
ps->label = alloc_mem((int)strlen(s) + 1);
strcpy(ps->label, s);
return ps;
}
/**************************************************************************
72 sub_4da7 ok++
**************************************************************************/
sym_t *allocBlankSym() {
register sym_t *ps;
ps = allocItem();
ps->label = "";
return ps;
}
/**************************************************************************
73 sub_4dbf ok++ Used in: optimise
**************************************************************************/
void resetHeap() {
int *p;
if (programBreak == 0) {
programBreak = sbrk(0); /* current base of heap */
} else {
brk(programBreak); /* reset the heap */
}
alloct = allocs = programBreak;
for (p = (int *)hashtab; p < (int *)&hashtab[HASHSIZE];) {
*p++ = 0;
}
freeItemList = NULL;
}
/**************************************************************************
74 sub_4e20 ok++ Used in: optimise
**************************************************************************/
void freeHashtab() {
allocs = (char *)&hashtab;