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general.cpp
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/******************************************************************************
* C++ code file : general.cpp
* Project : Pazcal Compiler
* Written by : Lolos Konstantinos, Podimata Charikleia
* (lolos.kostis@gmail.com, charapod@gmail.com)
* Date : 2014-2015
* Description : General use functions and tools
* Initial Code : Nikolaos S. Papaspyrou (nickie@softlab.ntua.gr)
******************************************************************************/
/* ---------------------------------------------------------------------
---------------------------- Header files ---------------------------
--------------------------------------------------------------------- */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "general.h"
#include "symbol.h"
#include "error.h"
#include "stdio.h"
#include <list>
#include <string>
#include <map>
using namespace std;
typedef RepReal (*REAL_OP)(RepReal, RepReal);
typedef int (*INT_OP)(int, int);
typedef bool (*COMP_OP)(RepReal, RepReal);
typedef bool (*COMP_BOOL)(bool, bool);
/* ---------------------------------------------------------------------
-------------------- Memory management functions --------------------
--------------------------------------------------------------------- */
void * newAlloc(size_t size)
{
void * result = malloc(size);
if (result == NULL)
fatal("\rOut of memory");
return result;
}
void deleteAlloc(void * p)
{
// we use garbage collection
}
const char *getFileName(const char *filename)
{
const char *s, *ret;
ret = filename;
for (s = filename; *s; s++)
if (*s == '/')
ret = s;
return ret;
}
/* ---------------------------------------------------------------------
----------------------- General variables ---------------------------
--------------------------------------------------------------------- */
char *trueConst, *falseConst;
char *zeroConst, *oneConst, *minusOneConst;
char *floatDecimals, *printLength;
char *new_line_const, *space_const;
unsigned int program_offset;
map<string, SymbolEntry *> lib_functions;
const char *filename;
bool ENABLE_OPT;
bool ENABLE_FINAL;
bool PRINT_IMM;
bool PRINT_DBG;
FILE *asm_out;
FILE *imm_out;
vector<quad> quads;
/* ---------------------------------------------------------------------
-------------------------- Helper functions -------------------------
--------------------------------------------------------------------- */
const char *print(const char* s);
void initiate_constants();
void initiate_library_functions();
void library_func(const char *lib_name, const char *pazcal_name, Type retType, Type t1, Type t2, Type t3);
const char *addressOf(const char * place);
Type funcResult(char * func);
Type typePtr(Type type);
Type typeArr(Type type);
const char *dereference(const char *place);
void printQuad(quad q, int i);
char * replace_extension(const char *filename, const char *ext);
void config_imm();
void config_final();
void config_debug();
void config_default();
REAL_OP get_real_op(const char *op);
INT_OP get_int_op(const char *op);
COMP_OP get_comp_op(const char *op);
COMP_BOOL get_comp_bool(const char *op);
/* Returns the number of the next quad */
int nextQuad()
{
return quads.size() ;
}
/* Generates and stores the given quad */
void genQuad(const char *op, const char *x, const char *y, const char *z)
{
SymbolEntry *xe = lookupEntry(x, LOOKUP_ALL_SCOPES, false);
SymbolEntry *ye = lookupEntry(y, LOOKUP_ALL_SCOPES, false);
SymbolEntry *ze = lookupEntry(z, LOOKUP_ALL_SCOPES, false);
quad *q = (quad *) malloc(sizeof(*q));
q->op = strdup(op);
q->x = strdup(x);
q->y = strdup(y);
q->z = strdup(z);
q->xe = xe;
q->ye = ye;
q->ze = ze;
quads.push_back(*q);
}
/* Generates and stores the given quad for parameters special */
void genQuad(const char *op, const char *x, const char *y, const char *z, SymbolEntry *par)
{
SymbolEntry * xe = lookupEntry(x, LOOKUP_ALL_SCOPES, false);
SymbolEntry * ye = lookupEntry(y, LOOKUP_ALL_SCOPES, false);
quad *q = (quad *) malloc(sizeof(*q));
q->op = strdup(op);
q->x = strdup(x);
q->y = strdup(y);
q->z = strdup(z);
q->xe = xe;
q->ye = ye;
q->ze = par;
quads.push_back(*q);
}
/* Returns the address of the given place */
const char *addressOf(const char *place)
{
if (*place != '[')
internal("Problem addressOf");
return strndup(place + 1,strlen(place+1));
}
/* Creates a list of quad tags that contains only x */
list<int> *makelist(int x)
{
list<int> *l = new list<int>();
l->push_back(x);
return l;
}
/* Function to backpatch a quad tag into the list l */
void backpatch(list<int> *l, int quadNum)
{
list<int>::iterator it;
char *temp;
for (it = l->begin(); it != l->end(); it++) {
if (strcmp(quads[*it].z, "*")) {
printQuads();
internal("Tried to backpatch value %i in line %i, was %s before", quadNum, *it, quads[*it].z);
}
temp = (char *) malloc(10);
sprintf(temp, "%d", quadNum);
quads[*it].z = temp;
}
}
/* Returns the type of the Nth argument of the function */
Type paramType(char *name, int n)
{
SymbolEntry * entry = lookupEntry(name, LOOKUP_ALL_SCOPES, false);
if (!entry) {
internal("%s function entry not found", name);
return typeVoid;
}
if (entry->entryType != ENTRY_FUNCTION) {
internal("%s entry found but was not a function", name);
return typeVoid;
}
SymbolEntry * temp = entry->u.eFunction.firstArgument;
while (temp != entry->u.eFunction.lastArgument) {
if (n-- == 1) return temp->u.eParameter.type;
temp = temp->u.eParameter.next;
}
if (n == 1)
return temp->u.eParameter.type;
else
internal("Invalid number of arguments.");
return typeVoid;
}
/* Returns the return type of the function */
Type funcResult(char * func)
{
SymbolEntry * entry = lookupEntry(func, LOOKUP_ALL_SCOPES, false);
if (!entry) {
internal("%s function entry not found", func);
return typeVoid; /* default error return value */
}
if (entry->entryType != ENTRY_FUNCTION) {
internal("%s entry found but was not a function", func);
return typeVoid;
}
Type type = entry->u.eFunction.resultType;
if (type->kind == TYPE_VOID)
internal("%s is a procedure and NOT a function!", func);
return type;
}
/* Returns the type referenced by the given type (pointer) */
Type typePtr(Type type)
{
if (type->kind != TYPE_POINTER) {
internal("Argument type not of TYPE_POINTER type.");
return typeVoid;
}
return type->refType;
}
/* Returns the type of the elements of the given array type */
Type typeArr(Type type)
{
if (type->kind != TYPE_ARRAY && type->kind != TYPE_IARRAY) {
internal("Argument type not of Array type.");
return typeVoid;
}
return type->refType;
}
/* Prints all the intermediate code that has been generated so far */
void printQuads()
{
unsigned int i;
for (i = 0; i < quads.size(); ++i) {
printQuad(quads[i], i);
}
}
/* Prints a quad */
void printQuad(quad q, int i)
{
fprintf(imm_out, "%d: %s, %s, %s, %s", i, q.op, print(q.x), print(q.y), print(q.z));
if (PRINT_DBG)
fprintf(imm_out, " \t(%s, %s, %s)\n", get_type(q.xe), get_type(q.ye), get_type(q.ze));
else
fprintf(imm_out, "\n");
}
/* Returns the printable version of the given variable */
const char *print(const char* s)
{
SymbolEntry *se = lookupEntry(s, LOOKUP_ALL_SCOPES, false);
if (se && (entry_type(se) == ENTRY_TEMPORARY) && (se->u.eTemporary.isReference)) {
char *temp = (char *) newAlloc(strlen(s)+3);
sprintf(temp, "[%s]", s);
return temp;
}
return s;
}
/* Prints lists */
void printList(list<int> *l,const char * s)
{
list<int>::iterator i;
printf("%s:",s);
for (i = l->begin(); i != l->end(); ++i)
printf(" %d ", *i);
printf("\n");
}
/* Creates intermediate code for expr evaluation */
char *generatePlace(list<int> *TRUE, list<int> *FALSE)
{
SymbolEntry *entry = newTemporary(typeBoolean);
backpatch(TRUE, nextQuad());
genQuad(":=", trueConst, "-", entry->u.eTemporary.name);
genQuad("jump", "-", "-", to_string(nextQuad() + 2).c_str());
backpatch(FALSE, nextQuad());
genQuad(":=", falseConst, "-", entry->u.eTemporary.name);
return entry->u.eTemporary.name;
}
/* Returns the type of a symbol table entry in string format */
const char *get_type(SymbolEntry *e)
{
if (!e)
return "-";
Type type;
switch (e->entryType) {
case ENTRY_VARIABLE:
type = e->u.eVariable.type;
break;
case ENTRY_CONSTANT:
type = e->u.eConstant.type;
break;
case ENTRY_FUNCTION:
type = e->u.eFunction.resultType;
break;
case ENTRY_PARAMETER:
type = e->u.eParameter.type;
break;
case ENTRY_TEMPORARY:
type = e->u.eTemporary.type;
break;
default:
internal("quad symbol entry was of unknown type!");
return "";
}
switch (type->kind) {
case TYPE_VOID:
return "void";
case TYPE_INTEGER:
return "int";
case TYPE_BOOLEAN:
return "bool";
case TYPE_CHAR:
return "char";
case TYPE_REAL:
return "real";
case TYPE_ARRAY:
return "arr";
case TYPE_IARRAY:
return "iarr";
case TYPE_POINTER:
return "ptr";
default:
internal("quad symbol entry was of unknown type!");
return "";
}
}
/* General initializations fuction */
void initiate()
{
openScope();
initiate_constants();
initiate_library_functions();
}
/* Initiates all the global variables for constants */
void initiate_constants()
{
/* create trueConst, falseConst */
VALUE v;
v.vBoolean = false;
SymbolEntry *entry = newTemporary(typeBoolean, &v);
falseConst = entry->u.eTemporary.name;
v.vBoolean = true;
entry = newTemporary(typeBoolean, &v);
trueConst = entry->u.eTemporary.name;
/* create oneConst */
v.vInteger = 1;
entry = newTemporary(typeInteger, &v);
oneConst = entry->u.eTemporary.name;
/* create zeroConst */
v.vInteger = 0;
entry = newTemporary(typeInteger, &v);
zeroConst = entry->u.eTemporary.name;
/* create minusOneConst */
v.vInteger = -1;
entry = newTemporary(typeInteger, &v);
minusOneConst = entry->u.eTemporary.name;
/* create default num of float decimals */
v.vInteger = 6;
entry = newTemporary(typeInteger, &v);
floatDecimals = entry->u.eTemporary.name;
/* create default print lenght */
v.vInteger = 1;
entry = newTemporary(typeInteger, &v);
printLength = entry->u.eTemporary.name;
/* create new constant for space */
v.vString = " ";
entry = newTemporary(typeString, &v);
space_const = entry->u.eTemporary.name;
/* create new constant for new line */
v.vString = "\\n";
entry = newTemporary(typeString, &v);
new_line_const = entry->u.eTemporary.name;
}
/* Adds all the library functions to the symbol table */
void initiate_library_functions()
{
/* Library Functions for input/output */
library_func("_putchar", "putchar", typeVoid, typeChar, NULL, NULL);
library_func("_puts", "puts", typeVoid, typeString, NULL, NULL);
library_func("_WRITE_INT", "WRITE_INT", typeVoid, typeInteger, typeInteger, NULL);
library_func("_WRITE_REAL2", "WRITE_REAL", typeVoid, typeReal, typeInteger, typeInteger);
library_func("_WRITE_BOOL", "WRITE_BOOL", typeVoid, typeBoolean, typeInteger, NULL);
library_func("_WRITE_CHAR", "WRITE_CHAR", typeVoid, typeChar, typeInteger, NULL);
library_func("_WRITE_STRING", "WRITE_STRING", typeVoid, typeString, typeInteger, NULL);
library_func("_READ_INT2", "READ_INT", typeInteger, NULL, NULL, NULL);
library_func("_READ_BOOL2", "READ_BOOL", typeBoolean, NULL, NULL, NULL);
library_func("_getchar2", "getchar", typeInteger, NULL, NULL, NULL);
library_func("_READ_REAL2", "READ_REAL", typeReal, NULL, NULL, NULL);
library_func("_READ_STRING", "READ_STRING", typeVoid, typeInteger, typeString, NULL);
/* Mathematical Functions */
library_func("_sin2", "sin", typeReal, typeReal, NULL, NULL);
library_func("_abs", "abs", typeInteger, typeInteger, NULL, NULL);
library_func("_fabs", "fabs", typeReal, typeReal, NULL, NULL);
library_func("_sqrt", "sqrt", typeReal, typeReal, NULL, NULL);
library_func("_cos", "cos", typeReal, typeReal, NULL, NULL);
library_func("_tan", "tan", typeReal, typeReal, NULL, NULL);
library_func("_arctan", "arctan", typeReal, typeReal, NULL, NULL);
library_func("_exp2", "exp", typeReal, typeReal, NULL, NULL);
library_func("_ln2", "ln", typeReal, typeReal, NULL, NULL);
library_func("_pi", "pi", typeReal, NULL, NULL, NULL);
/* Conversion Functions */
library_func("_trunc2", "trunc", typeReal, typeReal, NULL, NULL);
library_func("_round2", "round", typeReal, typeReal, NULL, NULL);
library_func("_TRUNC2", "TRUNC", typeInteger, typeReal, NULL, NULL);
library_func("_ROUND2", "ROUND", typeInteger, typeReal, NULL, NULL);
/* String Manipulation Functions */
library_func("_strlen", "strlen", typeInteger, typeString, NULL, NULL);
library_func("_strcmp", "strcmp", typeInteger, typeString, typeString, NULL);
library_func("_strcpy", "strcpy", typeVoid, typeString, typeString, NULL);
library_func("_strcat", "strcat", typeVoid, typeString, typeString, NULL);
}
/* Adds an entry to the symbol table for the given library function */
void library_func(const char *lib_name, const char *pazcal_name, Type retType, Type t1, Type t2, Type t3)
{
SymbolEntry *f = newFunction(lib_name);
openScope();
if (t1) newParameter("__x", t1, isArray(t1) ? PASS_BY_REFERENCE : PASS_BY_VALUE, f);
if (t2) newParameter("__y", t2, isArray(t2) ? PASS_BY_REFERENCE : PASS_BY_VALUE, f);
if (t3) newParameter("__z", t3, isArray(t3) ? PASS_BY_REFERENCE : PASS_BY_VALUE, f);
endFunctionHeader(f, retType);
closeScope();
lib_functions[pazcal_name] = f;
}
/* Returns the mode the Nth parameter of the given function is passed with */
const char *paramMode(const char *id, int N)
{
int i;
SymbolEntry *x, *entry = lookupEntry(id, LOOKUP_ALL_SCOPES, false);
if ((!entry) || (entry->entryType != ENTRY_FUNCTION) || !(entry->u.eFunction.firstArgument))
internal("paramMode called with invalid fuction id");
x = entry->u.eFunction.firstArgument;
for (i=0;i<N-1;i++) {
if (x == entry->u.eFunction.lastArgument)
internal("paramMode called with out of bounds argument number");
x = x->u.eParameter.next;
}
if (x->u.eParameter.mode == PASS_BY_VALUE)
return "V";
return "R";
}
/* Merges the elements of the second list into the first list */
void merge(list<int> *l1, list<int> *l2)
{
(*(l1)).merge(*(l2));
}
/* Generates the intermediate code that prints a space character */
void write_space()
{
call_write(typeString, space_const, printLength, NULL);
}
/* Generates the intermediate code that prints a new line */
void write_new_line()
{
call_write(typeString, new_line_const, printLength, NULL);
}
/* Generates intermediate code for WRITES */
void call_write(Type t, const char *printed, const char *length, const char *num_decimals)
{
SymbolEntry *write_func, *par;
switch (t->kind) {
case TYPE_VOID:
error("unprintable type");
break;
case TYPE_INTEGER:
write_func = lookupEntry("_WRITE_INT", LOOKUP_ALL_SCOPES, false);
par = write_func->u.eFunction.firstArgument;
genQuad("par", printed, "V", "-", par);
par = par->u.eParameter.next;
genQuad("par", length, "V", "-", par);
genQuad("call","-","-","_WRITE_INT");
break;
case TYPE_BOOLEAN:
write_func = lookupEntry("_WRITE_BOOL", LOOKUP_ALL_SCOPES, false);
par = write_func->u.eFunction.firstArgument;
genQuad("par", printed, "V", "-", par);
par = par->u.eParameter.next;
genQuad("par", length, "V", "-", par);
genQuad("call","-","-","_WRITE_BOOL");
break;
case TYPE_CHAR:
write_func = lookupEntry("_WRITE_CHAR", LOOKUP_ALL_SCOPES, false);
par = write_func->u.eFunction.firstArgument;
genQuad("par", printed, "V", "-", par);
par = par->u.eParameter.next;
genQuad("par", length, "V", "-", par);
genQuad("call","-","-","_WRITE_CHAR");
break;
case TYPE_REAL:
write_func = lookupEntry("_WRITE_REAL2", LOOKUP_ALL_SCOPES, false);
par = write_func->u.eFunction.firstArgument;
genQuad("par", printed, "V", "-", par);
par = par->u.eParameter.next;
genQuad("par", length, "V", "-", par);
par = par->u.eParameter.next;
genQuad("par", num_decimals, "V", "-", par);
genQuad("call","-","-","_WRITE_REAL2");
break;
case TYPE_ARRAY:
case TYPE_IARRAY:
if (t->refType->kind != TYPE_CHAR)
error("cannot print arrays");
write_func = lookupEntry("_WRITE_STRING", LOOKUP_ALL_SCOPES, false);
par = write_func->u.eFunction.firstArgument;
genQuad("par", printed, "R", "-", par);
par = par->u.eParameter.next;
genQuad("par", length, "V", "-", par);
genQuad("call","-","-","_WRITE_STRING");
break;
default:
internal("call_write: unknown parameter type");
}
}
/* returns the type of the result of a bin_expr between two arithmetic types
assumes the given types are reals, ints or chars */
Type calc_type(Type t1, Type t2)
{
int k1 = t1->kind, k2 = t2->kind;
if (k1 == TYPE_REAL || k2 == TYPE_REAL)
return typeReal;
if (k1 == TYPE_INTEGER || k2 == TYPE_INTEGER)
return typeInteger;
return typeChar;
}
/* returns TRUE is t1 is assignable to t2 */
bool assignable_var_def(Type t1, Type t2)
{
int k1 = t1->kind, k2 = t2->kind;
if (k1 == TYPE_INTEGER)
return (k2 == TYPE_INTEGER || k2 == TYPE_CHAR || k2 == TYPE_REAL);
else if (k1 == TYPE_CHAR)
return (k2 == TYPE_INTEGER || k2 == TYPE_CHAR);
else if (k1 == TYPE_REAL)
return (k2 == TYPE_REAL);
else if (k1 == TYPE_BOOLEAN)
return (k2 == TYPE_BOOLEAN);
else if (k1 == TYPE_VOID)
return true;
internal("Assignable called with invalid types.");
return false;
}
/* Returns true if the variable is a constant */
bool isConst(SymbolEntry *var)
{
return (var->entryType == ENTRY_CONSTANT) ||
(var->entryType == ENTRY_TEMPORARY && var->u.eTemporary.isConst);
}
/* Returns true if the variable is global */
bool isGlobal(SymbolEntry *var)
{
return var->isGlobal;
}
/* Returns true if the variable is temporary */
bool isTemp(SymbolEntry *var)
{
return var->entryType == ENTRY_TEMPORARY;
}
/* Returns true if the given temporary is array element */
bool isArrayElement(SymbolEntry *var)
{
return var->u.eTemporary.isArrayElement;
}
/* Parses the command line arguments */
void parse_arguments(int argc, char **argv)
{
int c;
int opt_i = 0, opt_o = 0, opt_f = 0, opt_d = 0;
while ((c = getopt(argc, argv, "iofd")) != -1) {
switch (c) {
case 'i': opt_i = 1; break;
case 'o': opt_o = 1; break;
case 'f': opt_f = 1; break;
case 'd': opt_d = 1; break;
case '?': break;
default : printf("?? getopt returned character code 0%o ??\n", c);
exit(EXIT_FAILURE);
}
}
if (optind < argc) {
filename = argv[optind];
} else if (!opt_i && !opt_f) {
printf("Usage: %s [-oifd] <filename>\n", argv[0]);
exit(EXIT_FAILURE);
}
// -ifo arguments are exclusive
if ((opt_i && opt_d) || (opt_i && opt_f) || (opt_d && opt_f)) {
printf("Error: -i -o -f flags are exclusive\n");
exit(EXIT_FAILURE);
}
if (opt_i) config_imm();
else if (opt_f) config_final();
else if (opt_d) config_debug();
else config_default();
// enable optimizations?
if (opt_o) ENABLE_OPT = true;
else ENABLE_OPT = false;
}
/* -i flag: program from stdin, intermediate code to stdout */
void config_imm()
{
ENABLE_FINAL = false;
PRINT_IMM = true;
PRINT_DBG = false;
imm_out = stdout;
asm_out = NULL;
}
/* -f flag: program from stdin, final code to stdout */
void config_final()
{
ENABLE_FINAL = true;
PRINT_IMM = false;
PRINT_DBG = false;
imm_out = NULL;
asm_out = stdout;
}
/* -d flag: program from file, code and debug comments to stdout */
void config_debug()
{
freopen(filename, "r", stdin);
ENABLE_FINAL = true;
PRINT_IMM = true;
PRINT_DBG = true;
imm_out = stdout;
asm_out = stdout;
}
/* no flag: program from file, intermediate code to .imm, final code to .asm */
void config_default()
{
ENABLE_FINAL = true;
PRINT_IMM = true;
PRINT_DBG = false;
freopen(filename, "r", stdin);
const char *file_imm = replace_extension(filename, ".imm");
const char *file_asm = replace_extension(filename, ".asm");
imm_out = fopen(file_imm, "w");
if (!imm_out) {
perror("open:");
exit(EXIT_FAILURE);
}
asm_out = fopen(file_asm, "w");
if (!asm_out) {
perror("open:");
exit(EXIT_FAILURE);
}
}
/* Replaces the extension of a file if it is .pz, else it appends .pz */
char *replace_extension(const char *filename, const char *ext)
{
int len = strlen(filename);
int ext_len = strlen(ext);
char *name = (char *) newAlloc(len + ext_len + 1);
strcpy(name, filename);
if (equal(filename + len - 3, ".pz"))
strcpy(name + len - 3, ext);
else
strcpy(name + len, ext);
return name;
}
/* Returns true if the strings are equal */
inline bool equal(const char *s1, const char *s2)
{
return !strcmp(s1, s2);
}
/* Returns true if the given type is a numeric type (int, char, real) */
bool is_numeric_type(Type t)
{
return is_integer_type(t) || (t->kind == TYPE_REAL);
}
/* Returns true if the given symbol entry is of REAL type */
bool is_real_type(SymbolEntry *e)
{
switch (e->entryType) {
case ENTRY_VARIABLE:
return is_real_type(e->u.eVariable.type);
case ENTRY_CONSTANT:
return is_real_type(e->u.eConstant.type);
case ENTRY_FUNCTION:
return is_real_type(e->u.eFunction.resultType);
case ENTRY_PARAMETER:
return is_real_type(e->u.eParameter.type);
case ENTRY_TEMPORARY:
return is_real_type(e->u.eTemporary.type);
default:
internal("unknown entryType");
return false;
}
}
bool is_real_type(Type type)
{
return type->kind == TYPE_REAL;
}
/* Returns true if the given kind is a numeric type (int, char, real) */
bool is_numeric_kind(KIND kind)
{
return is_integer_kind(kind) || (kind == TYPE_REAL);
}
/* Returns true if the given type is an integer type (int, char) */
bool is_integer_type(Type t)
{
return (t->kind == TYPE_INTEGER) || (t->kind == TYPE_CHAR);
}
/* Returns true if the given type is an array or an iarray */
bool isArray(Type t)
{
return (t->kind == TYPE_ARRAY) || (t->kind == TYPE_IARRAY);
}
/* Returns true if the given variable is an array or an iarray */
bool isArray(SymbolEntry *var)
{
return isArray(var_kind(var));
}
bool isArray(KIND k)
{
return (k == TYPE_ARRAY) || (k == TYPE_IARRAY);
}
/* Returns true if the given kind is a numeric type (int, char, real) */
bool is_integer_kind(KIND kind)
{
return (kind == TYPE_INTEGER) || (kind == TYPE_CHAR);
}
/* Returns true if the given entry is a reference */
bool is_by_ref(SymbolEntry *e)
{
KIND kind = var_kind(e);
EntryType entryType = entry_type(e);
if (entryType == ENTRY_PARAMETER)
return (kind == TYPE_ARRAY) || (kind == TYPE_IARRAY) || e->u.eParameter.mode == PASS_BY_REFERENCE;
else if (entryType == ENTRY_TEMPORARY)
return e->u.eTemporary.isReference;
return false;
}
/* Returns the entry type of the given Symbol Entry */
EntryType entry_type(SymbolEntry *var)
{
return var->entryType;
}
/* Returns the kind of the given variable */
KIND var_kind(SymbolEntry *var)
{
if (!var)
return TYPE_VOID;
switch (var->entryType) {
case ENTRY_VARIABLE:
return var->u.eVariable.type->kind;
case ENTRY_PARAMETER:
return var->u.eParameter.type->kind;
case ENTRY_CONSTANT:
return var->u.eConstant.type->kind;
case ENTRY_TEMPORARY:
return var->u.eTemporary.type->kind;
case ENTRY_FUNCTION:
return var->u.eFunction.resultType->kind;
default:
internal("var_kind called with entry that has no type");
return TYPE_VOID;
}
}
/* Returns the type of the given variable */
Type var_type(SymbolEntry *var)
{
if (!var)
return typeVoid;
switch (var->entryType) {
case ENTRY_VARIABLE:
return var->u.eVariable.type;
case ENTRY_PARAMETER:
return var->u.eParameter.type;
case ENTRY_CONSTANT:
return var->u.eConstant.type;
case ENTRY_TEMPORARY:
return var->u.eTemporary.type;
case ENTRY_FUNCTION:
return var->u.eFunction.resultType;
default:
internal("var_type called with entry that has no type");
return typeVoid;
}
}
/* Calculates the size of the parameters on the stack for a function call */
int calc_param_size(SymbolEntry *func)
{
if (func->entryType != ENTRY_FUNCTION)
internal("calc_param_size called with non-function");
SymbolEntry *first = func->u.eFunction.firstArgument;
SymbolEntry *last = func->u.eFunction.lastArgument;
int count = 0;
while (first != last) {
if (is_by_ref(first))
count += 4;
else
count += sizeOfType(first->u.eParameter.type);
first = first->u.eParameter.next;
}
if (first) {
if (is_by_ref(first))
count += 4;
else
count += sizeOfType(first->u.eParameter.type);
}
return count;
}
/* Returns true if the first type can be assigned to the second */
bool can_be_assigned_to(Type t1, Type t2)
{
KIND k1 = t1->kind;
KIND k2 = t2->kind;
if (is_integer_type(t2)) // int and char
return is_integer_type(t1);
else if (is_numeric_type(t2)) // reals
return is_numeric_type(t1);
else if (k2 == TYPE_BOOLEAN) // booleans
return k1 == TYPE_BOOLEAN;
else if (k2 == TYPE_POINTER) // pointers
return (k1 == TYPE_POINTER) && equal_types(t1->refType, t2->refType);
else if (k2 == TYPE_ARRAY) // arrays
return isArray(t1) && (t1->size == t2->size) && equal_types(t1->refType, t2->refType);
else if (k2 == TYPE_IARRAY) // unknown size arrays
return isArray(t1) && equal_types(t1->refType, t2->refType);
return false;
}
/* Returns true if the two types are equal */
bool equal_types(Type t1, Type t2)
{
KIND k1 = t1->kind;
KIND k2 = t2->kind;
switch (k1) {
case TYPE_ARRAY:
return (k2 == TYPE_ARRAY) && (t1->size == t2->size) && equal_types(t1->refType, t2->refType);
case TYPE_IARRAY:
return (k2 == TYPE_IARRAY) && equal_types(t1->refType, t2->refType);
case TYPE_POINTER:
return equal_types(t1->refType, t2->refType);
default:
return k1 == k2;
}
return false;
}
/* Returns the value of a real constant or const temporary */
RepReal get_real_val(SymbolEntry *real)
{
if (!isConst(real))
internal("get_real_val called with non constant symbol entry");
if (entry_type(real) == ENTRY_CONSTANT)
return real->u.eConstant.value.vReal;
else if (entry_type(real) == ENTRY_TEMPORARY)
return real->u.eTemporary.value.vReal;
else {
internal("get_real_val called with unknown constant entry type");
return 0;
}
}
/* Return the whole "VALUE" struct */
VALUE get_val(SymbolEntry *val)
{
if (!isConst(val))
internal("get_val called with non constant symbol entry");
if (entry_type(val) == ENTRY_CONSTANT)
return val->u.eConstant.value;
else if (entry_type(val) == ENTRY_TEMPORARY)
return val->u.eTemporary.value;
else {
internal("get_val called with unknown constant entry type");
VALUE v; //dummy value for return
return v;
}
}
/* Returns the value of a string constant */
const char *get_str_val(SymbolEntry *str)
{
if (!isConst(str))
internal("get_str_val called with non constant symbol entry");
if (entry_type(str) == ENTRY_CONSTANT)
return str->u.eConstant.value.vString;
else if (entry_type(str) == ENTRY_TEMPORARY)
return str->u.eTemporary.value.vString;
else {
internal("get_str_val called with unknown constant entry type");
return NULL;
}
}
/* Maximum of two integers */
int max(int a, int b)
{
return a > b ? a : b;
}
/* Evaluates the result of the given binary operation */
VALUE eval_bin_expr(VALUE v1, VALUE v2, KIND k1, KIND k2, const char *op)
{
VALUE res;
RepReal (*real_op)(RepReal, RepReal) = get_real_op(op);
int (*int_op)(int, int) = get_int_op(op);
if (k1 == TYPE_INTEGER && k2 == TYPE_INTEGER)
res.vInteger = int_op(v1.vInteger, v2.vInteger);
else if (k1 == TYPE_INTEGER && k2 == TYPE_REAL)
res.vReal = real_op(v1.vInteger, v2.vReal);
else if (k1 == TYPE_INTEGER && k2 == TYPE_CHAR)
res.vInteger = int_op(v1.vInteger, v2.vChar);
else if (k1 == TYPE_REAL && k2 == TYPE_INTEGER)
res.vReal = real_op(v1.vReal, v2.vInteger);
else if (k1 == TYPE_REAL && k2 == TYPE_REAL)
res.vReal = real_op(v1.vReal, v2.vReal);
else if (k1 == TYPE_REAL && k2 == TYPE_CHAR)
res.vReal = real_op(v1.vReal, v2.vChar);