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codegen.c
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#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <sys/time.h>
#include "typeChecker.h"
#include "codegen.h"
#include "error.h"
int switchLabelCount = 0 ;
int forLabelCount = 0 ;
int whileLabelCount = 0 ;
int otherLabelCount = 0 ;
int divZeroLabelCount = 0 ;
int asmLines = 0 ;
int tf = 0 ;
int df = 0 ;
char offsetStr[10] ;
int get_label (labelType lt)
{
switch (lt)
{
case LABEL_SWITCH :
switchLabelCount++ ;
return switchLabelCount ;
case LABEL_FOR :
forLabelCount++ ;
return forLabelCount ;
case LABEL_WHILE :
whileLabelCount++ ;
return whileLabelCount ;
case LABEL_DIV_ZERO :
divZeroLabelCount++ ;
return divZeroLabelCount ;
case LABEL_OTHER :
otherLabelCount++ ;
return otherLabelCount ;
}
}
void codeComment (int tabCount, char *comment)
{
int i ;
for (i = 0 ; i < tabCount ; i++)
codePrint ("\t") ;
codePrint ("; %s\n", comment) ;
}
char* getOffsetStr (int offset)
{
if (offset > 0)
sprintf (offsetStr, " - %d", offset) ;
else if (offset < 0)
sprintf (offsetStr, " + %d", -offset) ;
else
memset (offsetStr, 0, 10) ;
return offsetStr ;
}
int isIndexStatic (astNode *node)
{
return isdigit (node->child->tok->lexeme[0]) ;
}
void loadRegLeftLim (varST *vst, char *reg)
{
if (isLeftLimStatic (vst))
codePrint ("\t\tMOV %s, %s\n", reg, vst->arrayIndices->tokLeft->lexeme) ;
else
codePrint ("\t\tMOV %s, [RBP%s]\n", reg, getOffsetStr(vst->offset-10)) ;
}
void loadRegRightLim (varST *vst, char *reg)
{
if (isRightLimStatic (vst))
codePrint ("\t\tMOV %s, %s\n", reg, vst->arrayIndices->tokRight->lexeme) ;
else
codePrint ("\t\tMOV %s, [RBP%s]\n", reg, getOffsetStr(vst->offset-8)) ;
}
void loadArrBase (varST *vst, char *reg)
{
if (isVarStaticArr (vst))
{
if (vst->varType == VAR_LOCAL)
{
codePrint ("\t\tMOV %s, RBP\n", reg) ;
codePrint ("\t\tSUB %s, %d\n", reg, vst->offset) ;
}
else
codePrint ("\t\tMOV %s, [RBP%s]\n", reg, getOffsetStr (vst->offset)) ;
}
else
codePrint ("\t\tMOV %s, [RBP%s]\n", reg, getOffsetStr(vst->offset)) ;
}
int getStaticOffset (varST *vst, astNode *node, int size)
{
return vst->offset - size*(atoi(node->child->tok->lexeme) - atoi(vst->arrayIndices->tokLeft->lexeme)) ;
}
void arrBoundCheck (astNode *node, moduleST *lst, varST *vst)
{
varST *indexVar = NULL ;
if (!isIndexStatic (node))
indexVar = searchVar (lst, node->child->tok->lexeme) ;
tf |= 1 << boundCheck ;
loadArrBase (vst, "RDI") ;
loadRegLeftLim (vst, "BX") ;
if (indexVar == NULL)
codePrint ("\t\tMOV CX, %s\n", node->child->tok->lexeme) ;
else
codePrint ("\t\tMOV CX, [RBP%s]\n", getOffsetStr (indexVar->offset)) ;
loadRegRightLim (vst, "DX") ;
codePrint ("\t\tCALL @boundCheck") ;
codeComment (10, "checking array index bound") ;
}
int isExprLeaf (tokenID id)
{
switch (id)
{
case TK_ID :
return 1 ;
case TK_NUM :
return 1 ;
case TK_TRUE :
return 1 ;
case TK_FALSE :
return 1 ;
default :
return 0 ;
}
}
int isUnary (tokenID id)
{
return (id == TK_PLUS || id == TK_MINUS) ;
}
int isAssignUnary (astNode *assignNode)
{
return (isUnary (assignNode->child->next->id) && assignNode->child->next->child->next == NULL) ;
}
int isArrayRHS (astNode *assignNode, moduleST *lst)
{
varST *searchedVar ;
if (assignNode->child->next->id == TK_ID)
{
searchedVar = searchVar (lst, assignNode->child->next->tok->lexeme) ;
if (searchedVar->datatype == TK_ARRAY && assignNode->child->next->child == NULL)
return 1 ;
}
return 0 ;
}
int isSingleRHS (astNode *assignNode)
{
return isExprLeaf (assignNode->child->next->id) ;
}
void dynAsgnArr (varST *lhs, varST *rhs)
{
tf |= 1 << asgnLimERROR ;
int leftLab, rightLab ;
leftLab = get_label (LABEL_OTHER) ;
rightLab = get_label (LABEL_OTHER) ;
loadRegLeftLim (lhs, "AX") ;
loadRegLeftLim (rhs, "CX") ;
codePrint ("\t\tCMP AX, CX\n") ;
codePrint ("\t\tJE @LABEL%d\n", leftLab) ;
codePrint ("\t\tCALL @asgnLimERROR\n") ;
codePrint ("\n\t@LABEL%d:\n", leftLab) ;
loadRegRightLim (lhs, "BX") ;
loadRegRightLim (rhs, "DX") ;
codePrint ("\t\tCMP BX, DX\n") ;
codePrint ("\t\tJE @LABEL%d\n", rightLab) ;
codePrint ("\t\tCALL @asgnLimERROR\n") ;
codePrint ("\n\t@LABEL%d:\n", rightLab) ;
loadArrBase (rhs, "RDI") ;
codePrint ("\t\tMOV[RBP%s], RDI", getOffsetStr(lhs->offset)) ;
}
void exprAssign (astNode *node, moduleST *lst, int singleAssign)
{
if (!singleAssign)
codePrint ("\t\tPOP AX\n") ;
if(node->child == NULL)
{
varST *searchedVar = searchVar (lst, node->tok->lexeme) ;
if (node->next->id == TK_MINUS && node->next->child->next == NULL)
codePrint ("\t\tNEG AX\n") ;
codePrint ("\t\tMOV [RBP%s], AX", getOffsetStr (searchedVar->offset)) ;
}
else
{
varST* vst ;
vst = searchVar (lst,node->tok->lexeme);
if (isVarStaticArr(vst) && node->child->id == TK_NUM)
{
if (node->next->id == TK_MINUS && node->next->child->next == NULL)
codePrint ("\t\tNEG AX\n") ;
codePrint ("\t\tMOV [RBP%s], AX" , getOffsetStr(getStaticOffset(vst,node,2))) ;
}
else
{
if (node->next->id == TK_MINUS && node->next->child->next == NULL)
codePrint ("\t\tNEG AX\n") ;
arrBoundCheck (node, lst, vst) ;
codePrint ("\t\tMOV [RDI + RBX], AX") ;
}
}
codeComment (10, "store variable") ;
}
void exprLeaf (astNode *node, moduleST *lst, int singleAssign)
{
char reg[3] ;
if (!singleAssign && node->prev != NULL)
strcpy (reg, "BX") ;
else
strcpy (reg, "AX") ;
switch (node->id)
{
case TK_ID :
if (node->child == NULL)
{
varST *searchedVar = searchVar (lst, node->tok->lexeme) ;
codePrint ("\t\tMOV %s, [RBP%s]\n", reg, getOffsetStr(searchedVar->offset)) ;
}
else
{
varST *vst ;
vst = searchVar (lst,node->tok->lexeme) ;
if (isVarStaticArr(vst) && node->child->id == TK_NUM)
codePrint ("\t\tMOV %s, [RBP%s]\n", reg, getOffsetStr(getStaticOffset (vst, node, 2))) ;
else
{
arrBoundCheck (node, lst, vst) ;
codePrint ("\t\tMOV %s, [RDI + RBX]\n\n", reg) ;
}
}
break ;
case TK_RNUM :
break ;
case TK_NUM :
codePrint ("\t\tMOV %s, %s\n", reg, node->tok->lexeme);
break ;
case TK_TRUE :
codePrint ("\t\tMOV %s, 1\n", reg);
break ;
case TK_FALSE :
codePrint ("\t\tMOV %s, 0\n", reg);
break ;
}
if (!singleAssign)
codePrint ("\t\tPUSH %s\n", reg);
}
void expr (astNode *node, moduleST *lst, int singleAssign)
{
if (node->child == NULL || node->child->next == NULL)
{
exprLeaf (node, lst, singleAssign) ;
return ;
}
expr (node->child->next, lst, singleAssign) ;
expr (node->child, lst, singleAssign);
codePrint ("\t\tPOP AX\n");
codePrint ("\t\tPOP BX\n");
switch (node->id)
{
case TK_PLUS :
codePrint ("\t\tADD AX,BX\n");
break ;
case TK_MINUS :
codePrint ("\t\tSUB AX,BX\n");
break ;
case TK_MUL :
codePrint ("\t\tIMUL BX\n");
break ;
case TK_DIV :
{
codePrint ("\t\tCMP BX, 0\n") ;
tf |= 1 << divZeroERROR ;
int lab = get_label (LABEL_DIV_ZERO) ;
codePrint ("\t\tJNE @DIV_ZERO%d\n", lab) ;
codePrint ("\t\tCALL @divZeroERROR\n") ;
codePrint ("\n\t@DIV_ZERO%d:\n", lab) ;
codePrint ("\t\tCWD\n") ;
codePrint ("\t\tIDIV BX\n");
break ;
}
case TK_LT : case TK_GT : case TK_LE : case TK_GE : case TK_NE : case TK_EQ :
{
codePrint ("\t\tCMP AX,BX\n");
switch (node->id)
{
case TK_LT :
codePrint ("\t\tSETL AL\n");
break ;
case TK_GT :
codePrint ("\t\tSETG AL\n");
break ;
case TK_LE :
codePrint ("\t\tSETLE AL\n");
break ;
case TK_GE :
codePrint ("\t\tSETGE AL\n");
break ;
case TK_NE :
codePrint ("\t\tSETNE AL\n");
break ;
case TK_EQ :
codePrint ("\t\tSETE AL\n");
break ;
}
codePrint ("\t\tMOVSX AX, AL\n") ;
break ;
}
case TK_AND : case TK_OR :
{
if (node->id == TK_AND)
codePrint ("\t\tAND AX, BX\n");
else
codePrint ("\t\tOR AX, BX\n");
break ;
}
}
codePrint ("\t\tPUSH AX\n") ;
}
void print (astNode *node, moduleST *lst)
{
int start_label, end_label ;
int reserveLabel[2] ;
char valReg[5] ;
#if defined __linux__ || defined __MACH__
strcpy (valReg, "SI") ;
#endif
#ifdef _WIN64
strcpy (valReg, "DX") ;
#endif
varST *searchedVar ;
if (node->id == TK_ID)
searchedVar = searchVar (lst, node->tok->lexeme) ;
else
{
if (node->id == TK_NUM)
{
tf |= 1 << printInteger ;
codePrint ("\t\tMOV %s, %s\n", valReg, node->tok->lexeme) ;
codePrint ("\t\tCALL @printInteger\n\n") ;
}
else if (node->id == TK_TRUE || node->id == TK_FALSE)
{
tf |= 1 << printBoolean ;
codePrint ("\t\tMOV %s, %d\n", valReg, node->tok->lexeme[0]=='t'?1:0) ;
codePrint ("\t\tCALL @printBoolean\n\n") ;
}
return ;
}
if (searchedVar->datatype == TK_INTEGER)
{
tf |= 1 << printInteger ;
codePrint ("\t\tMOV %s, [RBP%s]\n", valReg, getOffsetStr(searchedVar->offset)) ;
codePrint ("\t\tCALL @printInteger\n\n") ;
}
else if (searchedVar->datatype == TK_BOOLEAN)
{
tf |= 1 << printBoolean ;
codePrint ("\t\tMOV %s, [RBP%s]\n", valReg, getOffsetStr(searchedVar->offset)) ;
codePrint ("\t\tCALL @printBoolean\n\n") ;
}
else // Array type
{
if (node->child != NULL)
{
// Special Case
if (node->child->id == TK_NUM && isVarStaticArr (searchedVar))
codePrint ("\t\tMOV %s, [RBP%s]\n", valReg, getOffsetStr(getStaticOffset(searchedVar,node,2))) ;
else
{
// General case of static array with dynamic indices, or dynamic array
arrBoundCheck (node, lst, searchedVar) ;
codePrint ("\t\tMOV %s, [RDI + RBX]\n", valReg) ;
}
if (searchedVar->arrayIndices->type == TK_INTEGER)
{
tf |= 1 << printInteger ;
codePrint ("\t\tCALL @printInteger\n\n") ;
}
else
{
tf |= 1 << printBoolean ;
codePrint ("\t\tCALL @printBoolean\n\n") ;
}
}
else
{
loadArrBase (searchedVar, "RDI") ;
#if defined __linux__ || defined __MACH__
loadRegLeftLim (searchedVar, "CX") ;
loadRegRightLim (searchedVar, "DX") ;
codePrint ("\t\tSUB DX, CX\n") ;
codePrint ("\t\tADD DX, 1\n") ;
codePrint ("\t\tADD DX, DX\n") ;
#endif
#ifdef _WIN64
loadRegLeftLim (searchedVar, "AX") ;
loadRegRightLim (searchedVar, "BX") ;
codePrint ("\t\tSUB BX, AX\n") ;
codePrint ("\t\tADD BX, 1\n") ;
codePrint ("\t\tADD BX, BX\n") ;
#endif
if (searchedVar->arrayIndices->type == TK_INTEGER)
{
tf |= 1 << printIntegerArr ;
codePrint ("\t\tCALL @printIntegerArr\n\n") ;
}
else
{
tf |= 1 << printBooleanArr ;
codePrint ("\t\tCALL @printBooleanArr\n\n") ;
}
}
}
}
void RSPAlign ()
{
codePrint ("\t\tMOV RAX, RSP") ;
codeComment (9, "Stack Alignment") ;
codePrint ("\t\tAND RAX, 15\n") ;
codePrint ("\t\tADD RAX, 8\n") ;
codePrint ("\t\tSUB RSP, RAX\n") ;
codePrint ("\t\tPUSH RAX\n") ;
}
void RSPRestore ()
{
codePrint ("\n\t\tPOP RAX\n") ;
codePrint ("\t\tADD RSP, RAX") ;
codeComment (9, "Restoring Stack Alignment") ;
}
void getValue (moduleST *lst, varST *vst)
{
int rspAlign ;
df |= 1 << inputInt ;
char promptReg[5] ;
#if defined __linux__ || defined __MACH__
strcpy (promptReg, "RDI") ;
#endif
#ifdef _WIN64
strcpy (promptReg, "RCX") ;
#endif
if (vst->datatype == TK_INTEGER || vst->datatype == TK_BOOLEAN)
{
if (vst->datatype == TK_INTEGER)
{
df |= 1 << inputIntPrompt ;
codePrint ("\n\t\tMOV %s, @inputIntPrompt", promptReg) ;
}
else if (vst->datatype == TK_BOOLEAN)
{
df |= 1 << inputBoolPrompt ;
codePrint ("\n\t\tMOV %s, @inputBoolPrompt", promptReg) ;
}
codeComment (9, "get_value") ;
tf |= 1 << getValuePrimitive ;
codePrint ("\t\tMOV RBX, -%d\n", vst->offset) ;
codePrint ("\t\tCALL @getValuePrimitive\n\n") ;
}
else // Array type
{
if (vst->arrayIndices->type == TK_INTEGER)
{
df |= 1 << inputIntArrPrompt ;
codePrint ("\t\tMOV %s, @inputIntArrPrompt\n", promptReg) ;
}
else
{
df |= 1 << inputBoolArrPrompt ;
codePrint ("\t\tMOV %s, @inputBoolArrPrompt\n", promptReg) ;
}
tf |= 1 << printGetArrPrompt ;
tf |= 1 << getArr ;
#if defined __linux__ || defined __MACH__
loadRegLeftLim (vst, "BX") ;
loadRegRightLim (vst, "CX") ;
#endif
#ifdef _WIN64
loadRegLeftLim (vst, "SI") ;
loadRegRightLim (vst, "DI") ;
#endif
codePrint ("\t\tCALL @printGetArrPrompt\n\n") ;
#if defined __linux__ || defined __MACH__
codePrint ("\t\tMOV DX, CX\n") ;
codePrint ("\t\tSUB DX, BX\n") ;
codePrint ("\t\tADD DX, 1\n") ;
codePrint ("\t\tADD DX, DX\n") ;
codePrint ("\t\tMOVSX RDX, DX\n") ;
#endif
#ifdef _WIN64
codePrint ("\t\tMOV BX, DI\n") ;
codePrint ("\t\tSUB BX, SI\n") ;
codePrint ("\t\tADD BX, 1\n") ;
codePrint ("\t\tADD BX, BX\n") ;
codePrint ("\t\tMOVSX RBX, BX\n") ;
#endif
loadArrBase (vst, "RDI") ;
codePrint ("\t\tCALL @getArr\n\n") ;
}
}
void dynamicDeclarationCheck (moduleST *lst, varST *vst)
{
int start_label , end_label ;
varST *leftVar , *rightVar ;
tf |= 1 << dynamicDeclCheck ;
codePrint ("\n") ;
if (isLeftLimStatic (vst))
codePrint ("\t\tMOV AX, %s\n", vst->arrayIndices->tokLeft->lexeme) ;
else
{
leftVar = searchVar (lst, vst->arrayIndices->tokLeft->lexeme) ;
codePrint ("\t\tMOV AX, [RBP%s]\n", getOffsetStr (leftVar->offset)) ;
}
if (isRightLimStatic (vst))
codePrint ("\t\tMOV BX, %s\n", vst->arrayIndices->tokRight->lexeme) ;
else
{
rightVar = searchVar (lst, vst->arrayIndices->tokRight->lexeme) ;
codePrint ("\t\tMOV BX, [RBP%s]\n", getOffsetStr(rightVar->offset)) ;
}
codePrint ("\t\tCALL @dynamicDeclCheck") ;
codeComment (10, "checking dynamic array declaration limits") ;
codePrint ("\n\n") ;
}
void dynamicDeclaration (moduleST *lst, varST *vst, int declCount)
{
RSPAlign () ;
dynamicDeclarationCheck (lst, vst) ;
codePrint ("\t\tPUSH BX") ;
codeComment (12, "saving register for malloc") ;
codePrint ("\t\tPUSH AX") ;
codeComment (12, "saving register for malloc") ;
int RSPsub ;
if (declCount > 1)
{
char counterReg[3], mallocReg[5] ;
#if defined __linux__ || defined __MACH__
strcpy (counterReg, "CX") ;
strcpy (mallocReg, "RDI") ;
RSPsub = 10 ;
#endif
#ifdef _WIN64
strcpy (counterReg, "AX") ;
strcpy (mallocReg, "RCX") ;
RSPsub = 42 ;
#endif
codePrint ("\t\tMOV RBX, %d\n", -vst->offset) ;
codePrint ("\n\t\tMOV %s, 0\n", counterReg) ;
codePrint ("\n\t.declLoop:\n") ;
codePrint ("\t\tPUSH %s\n", counterReg) ;
codePrint ("\t\tPUSH %s\n", mallocReg) ;
codePrint ("\t\tPUSH RBX\n") ;
codePrint ("\t\tSUB RSP, %d\n", RSPsub) ;
#if defined __linux__ || defined _WIN64
codePrint ("\t\tCALL malloc\n") ;
#endif
#ifdef __MACH__
codePrint ("\t\tCALL _malloc\n") ;
#endif
codePrint ("\t\tADD RSP, %d\n", RSPsub) ;
codePrint ("\t\tPOP RBX\n") ;
codePrint ("\t\tMOV [RBP + RBX], RAX\n") ;
codePrint ("\t\tPOP %s\n", mallocReg) ;
codePrint ("\t\tPOP %s\n", counterReg) ;
codePrint ("\t\tPOP SI\n") ;
codePrint ("\t\tMOV [RBP + RBX + 10], SI\n") ;
codePrint ("\t\tPOP DI\n") ;
codePrint ("\t\tMOV [RBP + RBX + 8], DI\n") ;
codePrint ("\t\tPUSH DI\n") ;
codePrint ("\t\tPUSH SI\n") ;
codePrint ("\t\tADD RBX, 12\n") ;
codePrint ("\t\tINC %s\n", counterReg) ;
codePrint ("\t\tCMP %s, %d\n", counterReg, declCount) ;
codePrint ("\t\tJL .declLoop\n") ;
codePrint ("\t\tADD RSP, 4") ;
codeComment (8, "Restoring array limits") ;
}
else
{
#if defined __linux__ || defined __MACH__
RSPsub = 12 ;
#endif
#ifdef _WIN64
RSPsub = 44 ;
#endif
codePrint ("\t\tSUB RSP, %d\n", RSPsub) ;
#if defined __linux__ || defined _WIN64
codePrint ("\t\tCALL malloc\n") ;
#endif
#ifdef __MACH__
codePrint ("\t\tCALL _malloc\n") ;
#endif
codePrint ("\t\tADD RSP, %d\n", RSPsub) ;
codePrint ("\t\tMOV [RBP%s], RAX\n", getOffsetStr(vst->offset)) ;
codePrint ("\t\tPOP SI\n") ;
codePrint ("\t\tMOV [RBP%s], SI\n", getOffsetStr(vst->offset - 10)) ;
codePrint ("\t\tPOP DI\n") ;
codePrint ("\t\tMOV [RBP%s], DI\n\n", getOffsetStr(vst->offset - 8)) ;
}
RSPRestore () ;
}
/* ---------------------------------- SWITCH CASE ------------------------------------- */
int getCaseCount (astNode *statementsNode)
{
int cnt = 0 ;
while (statementsNode != NULL)
{
cnt++ ;
if (statementsNode->next != NULL)
{
if (statementsNode->next->id == TK_DEFAULT)
return cnt ;
statementsNode = statementsNode->next->next->next ;
}
else
statementsNode = NULL ;
}
return cnt ;
}
void switchDeclareVars (astNode *statementsNode)
{
astNode *statementNode ;
// Reserving space for switch scope variables
while (statementsNode != NULL)
{
statementNode = statementsNode->child ;
while (statementNode != NULL)
{
if (statementNode->child->id == TK_DECLARE)
{
moduleGeneration (statementNode->child, statementsNode->localST) ;
statementNode->child->parent = statementNode->child ; // tieing a knot
}
statementNode = statementNode->next ;
}
if (statementsNode->next != NULL)
{
if (statementsNode->next->id == TK_DEFAULT)
{
statementsNode = statementsNode->next->next ;
statementNode = statementsNode->child ;
while (statementNode != NULL)
{
if (statementNode->child->id == TK_DECLARE)
{
moduleGeneration (statementNode->child, statementsNode->localST) ;
statementNode->child->parent = statementNode->child ; // tieing a knot
}
statementNode = statementNode->next ;
}
break ;
}
statementsNode = statementsNode->next->next->next ;
}
else
statementsNode = NULL ;
}
}
int switchCaseLabels (astNode *node, moduleST *lst, int caseCount , int *caseLabels)
{
int i, def_label = -1 ;
for (i = 0 ; i < caseCount ; i++)
caseLabels[i] = get_label (LABEL_SWITCH) ;
varST *switchVar = searchVar (lst, node->next->tok->lexeme) ;
codePrint ("\n\t\tMOV AX, [RBP%s]", getOffsetStr(switchVar->offset)) ;
codeComment (10, "loading switch variable") ;
astNode *caseValNode = node->next->next->next ;
i = 0 ;
if (switchVar->datatype == TK_INTEGER)
{
while (caseValNode != NULL)
{
codePrint ("\n\t\tCMP AX, %s", caseValNode->tok->lexeme) ;
codeComment (11, "switch case") ;
codePrint ("\t\tJE @SWITCH%d\n", caseLabels[i]) ;
if (caseValNode->next->next->next->id == statements)
{
def_label = get_label (LABEL_SWITCH) ;
codePrint ("\n\t\tJMP @SWITCH%d", def_label) ;
codeComment (11, "default case") ;
break ;
}
i++ ;
caseValNode = caseValNode->next->next->next ;
}
}
else
{
codePrint ("\n\t\tCMP AX, 0\n") ;
if (caseValNode->tok->lexeme[0] == 't')
{
codePrint ("\t\tJNE @SWITCH%d", caseLabels[0]) ;
codeComment (11, "true case") ;
}
else
{
codePrint ("\t\tJE @SWITCH%d", caseLabels[0]) ;
codeComment (11, "false case") ;
}
codePrint ("\t\tJMP @SWITCH%d", caseLabels[1]) ;
if (caseValNode->tok->lexeme[0] == 't')
codeComment (11, "false case") ;
else
codeComment (11, "true case") ;
}
return def_label ;
}
void pushInputDynamicArr (varST *vst, varSTentry *varEntry, char *reg, pushArrLim flag)
{
int lab, sub ;
if (flag == LEFT)
sub = 10 ;
else
sub = 8 ;
codePrint ("\t\tMOV %s, [RBP%s]\n", reg, getOffsetStr(vst->offset - sub)) ;
if (isLeftLimStatic(varEntry->thisVarST) && !isLeftLimStatic(vst))
{
lab = get_label (LABEL_OTHER) ;
tf |= 1 << argLimERROR ;
if (flag == LEFT)
codePrint ("\t\tMOV CX, %s\n", varEntry->thisVarST->arrayIndices->tokLeft->lexeme) ;
else
codePrint ("\t\tMOV CX, %s\n", varEntry->thisVarST->arrayIndices->tokRight->lexeme) ;
codePrint ("\t\tCMP %s, CX\n", reg) ;
codePrint ("\t\tJE @LABEL%d\n", lab) ;
codePrint ("\t\tCALL @argLimERROR\n") ;
codePrint ("\n\t@LABEL%d:\n", lab) ;
}
if (!isVarStaticArr (varEntry->thisVarST))
codePrint ("\t\tPUSH %s\n", reg) ;
}
void pushInput (astNode *inputEnd, varSTentry *varEntry, moduleST *lst)
{
varST *searchedVar ;
while (varEntry->thisVarST->varType == VAR_PLACEHOLDER)
varEntry = varEntry->next ;
while (inputEnd != NULL)
{
searchedVar = searchVar (lst, inputEnd->tok->lexeme) ;
if (searchedVar->datatype == TK_INTEGER || searchedVar->datatype == TK_BOOLEAN)
{
codePrint ("\t\tMOV AX, [RBP%s]\n", getOffsetStr(searchedVar->offset)) ;
codePrint ("\t\tPUSH AX\n") ;
}
else if (isVarStaticArr (searchedVar))
{
loadArrBase (searchedVar, "RAX") ;
codePrint ("\t\tPUSH RAX\n") ;
}
else
{
pushInputDynamicArr (searchedVar, varEntry, "AX", LEFT) ;
pushInputDynamicArr (searchedVar, varEntry, "BX", RIGHT) ;
loadArrBase (searchedVar, "RAX") ;
codePrint ("\t\tPUSH RAX\n") ;
}
inputEnd = inputEnd->prev ;
varEntry = varEntry->next ;
while (varEntry != NULL && varEntry->thisVarST->varType == VAR_PLACEHOLDER)
varEntry = varEntry->next ;
}
}
void popOutput (astNode *outputHead, moduleST *lst)
{
varST* searchedVar ;
while (outputHead != NULL)
{
searchedVar = searchVar (lst, outputHead->tok->lexeme) ;
codePrint ("\t\tPOP AX\n") ;
codePrint ("\t\tMOV [RBP%s], AX\n", getOffsetStr(searchedVar->offset)) ;
outputHead = outputHead->next ;
}
codePrint ("\n") ;
}
void retModule (moduleST *lst)
{
codePrint ("\n\t\tMOV RSP, RBP\n") ;
codePrint ("\t\tPOP RBP\n") ;
if (lst == realBase->driverST) // driver module
{
#ifdef __linux__
codePrint ("\t\tMOV RAX, 60\n") ;
codePrint ("\t\tXOR RDI, RDI\n") ;
codePrint ("\t\tsyscall\n") ;
#endif
#ifdef __MACH__
codePrint ("\t\tMOV RAX, 0x2000001\n") ;
codePrint ("\t\tXOR RDI, RDI\n") ;
codePrint ("\t\tsyscall\n") ;
#endif
#ifdef _WIN64
codePrint ("\t\tret\n") ;
#endif
}
else
codePrint ("\t\tret\n") ;
printCommentLineNASM () ;
}
void freeDynamic (varSTentry *varEntry)
{
if (varEntry == NULL)
return ;
char freeReg[5] ;
RSPAlign () ;
#if defined __linux__ || defined __MACH__
strcpy (freeReg, "RDI") ;
#endif
#ifdef _WIN64
strcpy (freeReg, "RCX") ;
codePrint ("\n\t\tSUB RSP, 32\n") ;
#endif
while (varEntry != NULL)
{
codePrint ("\n\t\tMOV %s, [RBP%s]\n", freeReg, getOffsetStr (varEntry->thisVarST->offset)) ;
#if defined __linux__ || defined _WIN64
codePrint ("\t\tCALL free") ;
#endif
#ifdef __MACH__
codePrint ("\t\tCALL _free") ;
#endif
codeComment (8, "freeing local dynamic arrays\n") ;
varEntry = varEntry->next ;
}
#ifdef _WIN64
codePrint ("\t\tADD RSP, 32\n") ;
#endif
RSPRestore () ;
}
/*
Carried over convention from symbolTable.c
Module refers to not only a module, but any scope
*/
void moduleGeneration (astNode *node, moduleST *lst)
{
if (node == NULL)
return ;
varST *searchedVar ;
astNode *idListHead ;
moduleST *calledModule ;
varSTentry *varEntry ;
switch (node->id)