ref: bf7236ddf91b0242a3960fb3f66391e1a51b4a74
dir: /cc1/types.c/
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../inc/sizes.h"
#include "../inc/cc.h"
#include "cc1.h"
#define NR_TYPE_HASH 16
/*
* Compiler can generate warnings here if the ranges of TINT,
* TUINT and TFLOAT are smaller than any of the constants in this
* array. Ignore them if you know that the target types are correct
*/
static struct limits limits[][4] = {
{
{ /* 0 = signed 1 byte */
.min.i = -127,
.max.i = 127
},
{ /* 1 = signed 2 byte */
.min.i = -32767,
.max.i = 327677
},
{ /* 2 = signed 4 byte */
.min.i = -2147483647L,
.max.i = 2147483647L
},
{ /* 3 = signed 8 byte */
.min.i = -9223372036854775807LL,
.max.i = 9223372036854775807LL,
}
},
{
{ /* 0 = unsigned 1 byte */
.min.u = 0,
.max.u = 255
},
{ /* 1 = unsigned 2 bytes */
.min.u = 0,
.max.u = 65535u
},
{ /* 2 = unsigned 4 bytes */
.min.u = 0,
.max.u = 4294967295u
},
{ /* 3 = unsigned 4 bytes */
.min.u = 0,
.max.u = 18446744073709551615u
}
},
{
{
/* 0 = float 4 bytes */
.min.f = -1,
.max.f = 2
},
{
/* 1 = float 8 bytes */
.min.f = -1,
.max.f = 2,
},
{
/* 2 = float 16 bytes */
.min.f = -1,
.max.f = 2,
}
}
};
/*
* Initializaion of type pointers were done with
* a C99 initilizator '... = &(Type) {...', but
* c compiler in Plan9 gives error with this
* syntax, so I have switched it to this ugly form
* I hope I will change it again in the future
*/
static Type types[] = {
{ /* 0 = voidtype */
.op = VOID,
.letter = L_VOID,
.printed = 1
},
{ /* 1 = pvoidtype */
.op = PTR,
.letter = L_POINTER,
.size = 2,
.align = 2,
.printed = 1
},
{ /* 2 = booltype */
.op = INT,
.letter = L_BOOL,
.defined = 1,
.size = 1,
.align = 1,
.n.rank = RANK_BOOL,
.printed = 1
},
{ /* 3 = schartype */
.op = INT,
.letter = L_SCHAR,
.defined = 1,
.size = 1,
.align = 1,
.sign = 1,
.n.rank = RANK_SCHAR,
.printed = 1
},
{ /* 4 = uchartype */
.op = INT,
.letter = L_UCHAR,
.defined = 1,
.size = 1,
.align = 1,
.n.rank = RANK_UCHAR,
.printed = 1
},
{ /* 5 = chartype */
.op = INT,
.letter = L_CHAR,
.defined = 1,
.size = 1,
.align = 1,
.sign = 1,
.n.rank = RANK_CHAR,
.printed = 1
},
{ /* 6 = ushortype */
.op = INT,
.letter = L_USHORT,
.defined = 1,
.size = 2,
.align = 1,
.n.rank = RANK_USHORT,
.printed = 1
},
{ /* 7 = shortype */
.op = INT,
.letter = L_SHORT,
.defined = 1,
.size = 2,
.align = 1,
.sign = 1,
.n.rank = RANK_SHORT,
.printed = 1
},
{ /* 8 = uinttype */
.op = INT,
.letter = L_UINT,
.defined = 1,
.size = 2,
.align = 1,
.n.rank = RANK_UINT,
.printed = 1
},
{ /* 9 = inttype */
.op = INT,
.letter = L_INT,
.defined = 1,
.size = 2,
.align = 1,
.sign = 1,
.n.rank = RANK_INT,
.printed = 1
},
{ /* 10 = longtype */
.op = INT,
.letter = L_LONG,
.defined = 1,
.size = 4,
.align = 1,
.sign = 1,
.n.rank = RANK_LONG,
.printed = 1
},
{ /* 11 = ulongtype */
.op = INT,
.letter = L_ULONG,
.defined = 1,
.size = 4,
.align = 1,
.n.rank = RANK_ULONG,
.printed = 1
},
{ /* 12 = ullongtype */
.op = INT,
.letter = L_ULLONG,
.defined = 1,
.size = 8,
.align = 1,
.n.rank = RANK_ULLONG,
.printed = 1
},
{ /* 13 = llongtype */
.op = INT,
.letter = L_LLONG,
.defined = 1,
.size = 8,
.align = 1,
.sign = 1,
.n.rank = RANK_LLONG,
.printed = 1
},
{ /* 14 = floattype */
.op = FLOAT,
.letter = L_FLOAT,
.defined = 1,
.size = 4,
.align = 1,
.n.rank = RANK_FLOAT,
.printed = 1
},
{ /* 15 = doubletype */
.op = FLOAT,
.letter = L_DOUBLE,
.defined = 1,
.size = 8,
.align = 1,
.n.rank = RANK_DOUBLE,
.printed = 1
},
{ /* 16 = ldoubletype */
.op = FLOAT,
.letter = L_LDOUBLE,
.defined = 1,
.size = 16,
.align = 1,
.n.rank = RANK_LDOUBLE,
.printed = 1
},
{ /* 17 = sizettype */
.op = INT,
.letter = L_UINT,
.defined = 1,
.size = 2,
.align = 1,
.n.rank = RANK_UINT,
.printed = 1
}
};
Type *voidtype = &types[0], *pvoidtype = &types[1],
*booltype = &types[2], *schartype = &types[3],
*uchartype = &types[4], *chartype = &types[5],
*ushortype = &types[6], *shortype = &types[7],
*uinttype = &types[8], *inttype = &types[9],
*longtype = &types[10], *ulongtype = &types[11],
*ullongtype = &types[12], *llongtype = &types[13],
*floattype = &types[14], *doubletype = &types[15],
*ldoubletype = &types[16], *sizettype = &types[17];
static Symbol dummy0 = {.u.i = 0, .type = &types[9]},
dummy1 = {.u.i = 1, .type = &types[9]};
Symbol *zero = &dummy0, *one = &dummy1;
struct limits *
getlimits(Type *tp)
{
int ntable, ntype;
switch (tp->op) {
case INT:
ntable = tp->sign;
switch (tp->size) {
case 1: ntype = 0; break;
case 2: ntype = 1; break;
case 4: ntype = 2; break;
case 8: ntype = 3; break;
}
break;
case FLOAT:
ntable = 2;
switch (tp->size) {
case 4: ntype = 0; break;
case 8: ntype = 1; break;
case 16: ntype = 2; break;
}
break;
}
return &limits[ntable][ntype];
}
Type *
ctype(unsigned type, unsigned sign, unsigned size)
{
switch (type) {
case CHAR:
if (size)
goto invalid_type;
switch (sign) {
case 0:
return chartype;
case SIGNED:
return schartype;
case UNSIGNED:
return uchartype;
}
break;
case VOID:
if (size || sign)
goto invalid_type;
return voidtype;
case BOOL:
if (size || sign)
goto invalid_type;
return booltype;
case 0:
/* fallthrough */
case INT:
switch (size) {
case 0:
return (sign == UNSIGNED) ? uinttype : inttype;
case SHORT:
return (sign == UNSIGNED) ? ushortype : shortype;
case LONG:
return (sign == UNSIGNED) ? ulongtype : longtype;
case LLONG:
return (sign == UNSIGNED) ? ullongtype : llongtype;
}
break;
case DOUBLE:
if (size == LLONG)
goto invalid_type;
size += LONG;
goto floating;
case FLOAT:
if (size == LLONG)
goto invalid_type;
floating:
if (sign)
goto invalid_type;
switch (size) {
case 0:
return floattype;
case LONG:
return doubletype;
case LLONG:
return ldoubletype;
}
break;
}
invalid_type:
error("invalid type specification");
}
/* TODO: define a type for sizes instead of using short */
static short
typesize(Type *tp)
{
short align, size;
Symbol **sp;
int n;
switch (tp->op) {
case ARY:
return tp->n.elem * tp->type->size;
case PTR:
return pvoidtype->size;
case STRUCT:
size = 0;
n = tp->n.elem;
for (sp = tp->p.fields; n--; ++sp) {
tp = (*sp)->type;
align = tp->align-1;
size = size + align & ~align;
size += tp->size;
}
/* TODO: Add aligment of the first field */
return size;
case UNION:
size = 0;
n = tp->n.elem;
for (sp = tp->p.fields; n--; ++sp) {
tp = (*sp)->type;
if (tp->size > size)
size = tp->size;
}
/* TODO: Add aligment of the worst field */
return size;
case ENUM:
return inttype->size;
}
return 0;
}
Type *
mktype(Type *tp, unsigned op, short nelem, Type *pars[])
{
static Type *typetab[NR_TYPE_HASH];
Type **tbl, type;
unsigned t;
Type *bp;
static char letters[] = {
[PTR] = L_POINTER,
[ARY] = L_ARRAY,
[FTN] = L_FUNCTION,
[ENUM] = L_INT,
[STRUCT] = L_STRUCT,
[UNION] = L_UNION
};
if (op == PTR && tp == voidtype)
return pvoidtype;
type.type = tp;
type.op = op;
type.printed = 0;
type.letter = letters[op];
type.p.pars = pars;
type.n.elem = nelem;
type.ns = 0;
/* TODO: Set aligment for new types */
switch (op) {
case ARY:
if (nelem == 0)
goto no_defined;
/* PASSTROUGH */
case FTN:
case PTR:
type.defined = 1;
break;
case ENUM:
type.printed = 1;
/* PASSTROUGH */
case STRUCT:
case UNION:
no_defined:
type.defined = 0;
break;
}
t = (op ^ (uintptr_t) tp >> 3) & NR_TYPE_HASH-1;
tbl = &typetab[t];
for (bp = *tbl; bp; bp = bp->next) {
if (eqtype(bp, &type) && op != STRUCT && op != UNION) {
/*
* pars was allocated by the caller
* but the type already exists, so
* we have to deallocted it
*/
free(pars);
return bp;
}
}
type.size = typesize(&type);
bp = duptype(&type);
bp->next = *tbl;
return *tbl = bp;
}
bool
eqtype(Type *tp1, Type *tp2)
{
int n;
Type **p1, **p2;
if (!tp1 || !tp2)
return 0;
if (tp1 == tp2)
return 1;
switch (tp1->op) {
case ARY:
if (tp1->op != tp2->op || tp1->n.elem != tp2->n.elem)
return 0;
case PTR:
return eqtype(tp1->type, tp2->type);
case UNION:
case STRUCT:
case FTN:
if (tp1->op != tp2->op || tp1->n.elem != tp2->n.elem)
return 0;
p1 = tp1->p.pars, p2 = tp2->p.pars;
for (n = tp1->n.elem; n > 0; --n) {
if (!eqtype(*p1++, *p2++))
return 0;
}
return 1;
case VOID:
case ENUM:
return 0;
case INT:
case FLOAT:
return tp1->letter == tp2->letter;
default:
fputs("internal type error, aborting\n", stderr);
abort();
}
}