forked from Mirrors/tinycc
clarified function types - added extern / static - added unsigned and invalid type parsing
bellard
parent
9c1b84560e
commit
704d61357c
316
tcc.c
316
tcc.c
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@ -19,7 +19,7 @@
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int tok, *vac, *vat, *lsym, rsym,
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prog, ind, loc, glo, file, vt,
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vc, *macro_stack, *macro_stack_ptr, line_num;
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char *idtable, *idptr, *idlast, *filename;
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char *idtable, *idptr, *filename;
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/* The current value can be: */
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#define VT_CONST 0x0002 /* constant in vc */
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@ -49,30 +49,55 @@ char *idtable, *idptr, *idlast, *filename;
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* otherwise integer type is assumed.
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* */
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#define VT_BYTE 0x00001 /* byte pointer. HARDCODED VALUE */
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#define VT_PTRMASK 0x00f00 /* pointer mask */
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#define VT_PTRINC 0x00100 /* pointer increment */
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#define VT_FUNC 0x01000 /* function type */
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#define VT_TYPE 0x01f01 /* type mask */
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#define VT_TYPEN 0xffffe0fe /* ~VT_TYPE */
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#define VT_BYTE 0x00001 /* byte pointer. HARDCODED VALUE */
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#define VT_PTRMASK 0x00f00 /* pointer mask */
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#define VT_PTRINC 0x00100 /* pointer increment */
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#define VT_FUNC 0x01000 /* function type */
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#define VT_UNSIGNED 0x02000 /* unsigned type */
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#define VT_ARRAY 0x04000 /* array type (only used in parsing) */
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#define VT_TYPE 0x07f01 /* type mask */
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#define VT_TYPEN 0xffff80fe /* ~VT_TYPE */
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#define VT_FUNCN -4097
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#define VT_EXTERN 0x08000 /* extern definition */
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#define VT_STATIC 0x10000 /* static variable */
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/* Special infos */
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#define VT_DEFINE 0x02000 /* special value for #defined symbols */
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#define VT_DEFINE 0x80000 /* special value for #defined symbols */
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/* token values */
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#define TOK_INT 256
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#define TOK_VOID 257
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#define TOK_CHAR 258
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#define TOK_IF 259
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#define TOK_ELSE 260
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#define TOK_WHILE 261
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#define TOK_BREAK 262
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#define TOK_RETURN 263
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#define TOK_DEFINE 264
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#define TOK_MAIN 265
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#define TOK_FOR 266
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#define TOK_INT 256
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#define TOK_VOID 257
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#define TOK_CHAR 258
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#define TOK_IF 259
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#define TOK_ELSE 260
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#define TOK_WHILE 261
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#define TOK_BREAK 262
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#define TOK_RETURN 263
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#define TOK_DEFINE 264
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#define TOK_MAIN 265
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#define TOK_FOR 266
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#define TOK_EXTERN 267
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#define TOK_STATIC 268
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#define TOK_UNSIGNED 269
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#define TOK_GOTO 270
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#define TOK_DO 271
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#define TOK_CONTINUE 272
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#define TOK_SWITCH 273
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#define TOK_CASE 274
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/* ignored types Must have contiguous values */
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#define TOK_CONST 271
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#define TOK_LONG 276
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#define TOK_REGISTER 277
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#define TOK_SIGNED 278
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/* unsupported types. Must have contiguous values */
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#define TOK_FLOAT 279
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#define TOK_DOUBLE 280
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#define TOK_STRUCT 281
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#define TOK_UNION 282
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#define TOK_TYPEDEF 283
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#define TOK_EQ 0x94 /* warning: depend on asm code */
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#define TOK_NE 0x95 /* warning: depend on asm code */
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@ -166,6 +191,21 @@ void test_lvalue()
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#endif
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char *get_tok_str(int v)
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{
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int t;
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char *p;
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p = idtable;
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t = 256;
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while (t != v) {
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if (p >= idptr)
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return 0;
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while (*p++);
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t++;
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}
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return p;
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}
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void next()
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{
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int c, v;
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@ -226,7 +266,6 @@ void next()
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}
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if (isid(c)) {
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q = idptr;
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idlast = q;
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while(isid(c) | isnum(c)) {
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*q++ = c;
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c = inp();
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@ -328,6 +367,7 @@ void vset(t, v)
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}
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/* generate a value in eax from vt and vc */
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/* XXX: generate correct pointer for forward references to functions */
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void gv()
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{
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#ifndef TINY
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@ -402,15 +442,23 @@ int gtst(inv, t)
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return t;
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}
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/* return the size in bytes of a given type */
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int type_size(t)
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{
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if ((t & VT_PTRMASK) > VT_PTRINC | (t & VT_TYPE) == VT_PTRINC)
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if ((t & VT_PTRMASK) >= VT_PTRINC | (t & VT_TYPE) == 0)
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return 4;
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else
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return 1;
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}
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/* return the number size in bytes of a given type */
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int incr_value(t)
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{
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if ((t & VT_PTRMASK) >= VT_PTRINC)
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return type_size(t - VT_PTRINC);
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else
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return 1;
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}
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#define POST_ADD 0x1000
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#define PRE_ADD 0
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@ -422,12 +470,13 @@ void inc(a, c)
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gv();
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o(0x018bc189); /* movl %eax, %ecx ; mov (%ecx), %eax */
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o(0x408d | a); /* leal x(%eax), %eax/%edx */
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g((c - TOK_MID) * type_size(vt));
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g((c - TOK_MID) * incr_value(vt));
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o(0x0189 | a); /* mov %eax/%edx, (%ecx) */
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}
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/* XXX: handle ptr sub and 'int + ptr' case (only 'ptr + int' handled) */
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/* XXX: handle constant propagation (need to track live eax) */
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/* XXX: handle unsigned propagation */
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void gen_op(op, l)
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{
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int t;
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@ -445,7 +494,7 @@ void gen_op(op, l)
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o(0x59); /* pop %ecx */
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if (op == '+' | op == '-') {
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/* XXX: incorrect for short (futur!) */
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if (type_size(t) == 4)
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if (incr_value(t) == 4)
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o(0x02e0c1); /* shl $2, %eax */
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if (op == '-')
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o(0xd8f7); /* neg %eax */
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@ -461,16 +510,23 @@ void gen_op(op, l)
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o(0xc1af0f); /* imul %ecx, %eax */
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#ifndef TINY
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else if (op == TOK_SHL | op == TOK_SHR) {
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o(0xd391); /* xchg %ecx, %eax, shl/sar %cl, %eax */
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o(0xd391); /* xchg %ecx, %eax, shl/shr/sar %cl, %eax */
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if (op == TOK_SHL)
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o(0xe0);
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else if (t & VT_UNSIGNED)
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o(0xe8);
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else
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o(0xf8);
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}
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#endif
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else if (op == '/' | op == '%') {
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o(0x91); /* xchg %ecx, %eax */
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o(0xf9f799); /* cltd, idiv %ecx, %eax */
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if (t & VT_UNSIGNED) {
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o(0xd231); /* xor %edx, %edx */
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o(0xf1f7); /* div %ecx, %eax */
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} else {
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o(0xf9f799); /* cltd, idiv %ecx, %eax */
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}
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if (op == '%')
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o(0x92); /* xchg %edx, %eax */
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} else {
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@ -486,19 +542,33 @@ void gen_op(op, l)
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int ist()
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{
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int t;
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if (tok == TOK_INT | tok == TOK_CHAR | tok == TOK_VOID) {
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t = tok;
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t = 0;
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while(1) {
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if (tok == TOK_CHAR | tok == TOK_VOID) {
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t |= VT_BYTE;
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} else if (tok == TOK_INT |
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(tok >= TOK_CONST & tok <= TOK_SIGNED)) {
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/* ignored types */
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} else if (tok >= TOK_FLOAT & tok <= TOK_TYPEDEF) {
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error("unsupported type");
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} else if (tok == TOK_EXTERN) {
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t |= VT_EXTERN;
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} else if (tok == TOK_STATIC) {
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t |= VT_STATIC;
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} else if (tok == TOK_UNSIGNED) {
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t |= VT_UNSIGNED;
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} else {
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break;
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}
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next();
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return (t != TOK_INT) | 2;
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} else {
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return 0;
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t |= 2;
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}
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return t;
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}
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/* Read a type declaration (except basic type), and return the
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type. If v is true, then also put variable name in 'vc' */
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int typ(v,t)
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int typ(int *v, int t, int *array_size_ptr)
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{
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int u, p, n;
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@ -512,46 +582,80 @@ int typ(v,t)
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/* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
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if (tok == '(') {
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next();
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u = typ(v, 0);
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u = typ(v, 0, 0);
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skip(')');
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} else {
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u = 0;
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/* type identifier */
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if (v) {
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vc = tok;
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*v = tok;
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next();
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}
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}
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/* function declaration */
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if (tok == '(') {
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next();
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p = 4;
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n = vc; /* must save vc there */
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while (tok != ')') {
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/* read param name and compute offset */
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while(1) {
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if (tok == '(') {
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/* function declaration */
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next();
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p = 4;
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while (tok != ')') {
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/* read param name and compute offset */
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if (t = ist())
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t = typ(1, t); /* XXX: should accept both arg/non arg if v == 0 */
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t = typ(&n, t, 0); /* XXX: should accept both arg/non arg if v == 0 */
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else {
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vc = tok;
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n = tok;
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t = 0;
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next();
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}
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p = p + 4;
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vat[vc] = VT_LOCAL | VT_LVAL | t;
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vac[vc] = p;
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vat[n] = VT_LOCAL | VT_LVAL | t;
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vac[n] = p;
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if (tok == ',')
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next();
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}
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next(); /* skip ')' */
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vc = n;
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if (u)
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t = u + VT_BYTE;
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else
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t = t | VT_FUNC;
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}
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next(); /* skip ')' */
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if (u)
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t = u + VT_BYTE;
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else
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t = t | VT_FUNC;
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} else if (tok == '[') {
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/* array definition */
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if (t & VT_ARRAY)
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error("multi dimension arrays not supported");
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next();
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vc = 0;
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if (tok != ']') {
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expr();
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if (array_size_ptr)
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*array_size_ptr = vc;
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}
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if ((vt & (VT_CONST | VT_LVAL)) != VT_CONST |
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(vc <= 0 & array_size_ptr != 0))
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error("invalid array size");
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skip(']');
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t = (t + VT_PTRINC) | VT_ARRAY;
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} else
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break;
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}
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return t;
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}
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/* define a new external reference to a function 'v' of type 'u' */
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void external_func(v, u)
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{
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int t, n;
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t = vat[v];
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if (t == 0) {
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n = dlsym(0, get_tok_str(v));
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if (n == 0) {
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vat[v] = u | VT_CONST | VT_LVAL | VT_FORWARD;
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vac[v] = 0; /* used to generate symbol list */
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} else {
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vat[v] = u | VT_CONST | VT_LVAL; /* int f() */
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vac[v] = n;
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}
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}
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}
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/* read a number in base b */
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int getn(c, b)
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{
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@ -631,20 +735,18 @@ void unary()
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vset(VT_CONST | VT_PTRINC | VT_BYTE, glo);
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while (tok == '\"') {
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while((n = inp()) != 34) {
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*(char *)glo = getq(n);
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glo++;
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*(char *)glo++ = getq(n);
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}
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next();
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}
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*(char *)glo = 0;
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glo = (glo + 4) & -4; /* align heap */
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*(char *)glo++ = 0;
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} else {
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t = tok;
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next();
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if (t == '(') {
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/* cast ? */
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if (t = ist()) {
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ft = typ(0, t);
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ft = typ(0, t, 0);
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skip(')');
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unary();
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vt = (vt & VT_TYPEN) | ft;
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@ -700,15 +802,17 @@ void unary()
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}
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} else
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{
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vset(vat[t], vac[t]);
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/* forward reference or external reference ? */
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if (vt == 0) {
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n = dlsym(0, idlast);
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if (n == 0)
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vset(VT_CONST | VT_FORWARD | VT_LVAL, vac + t);
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else
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vset(VT_CONST | VT_LVAL, n);
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if (vat[t] == 0) {
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if (tok != '(')
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error("undefined symbol");
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/* for simple function calls, we tolerate undeclared
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external reference */
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external_func(t, VT_FUNC); /* int() function */
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}
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vset(vat[t], vac[t]);
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/* if forward reference, we must point to vac[t] */
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if (vt & VT_FORWARD)
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vc = t;
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}
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}
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@ -764,18 +868,20 @@ void unary()
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}
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if (ft & VT_CONST) {
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/* forward reference */
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if (ft & VT_FORWARD)
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*(int *)fc = psym(0xe8, *(int *)fc);
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else
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if (ft & VT_FORWARD) {
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vac[fc] = psym(0xe8, vac[fc]);
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} else
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oad(0xe8, fc - ind - 5);
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/* return value is variable, and take type from function proto */
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vt = VT_VAR | (ft & VT_TYPE & VT_FUNCN);
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} else {
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oad(0x2494ff, t); /* call *xxx(%esp) */
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t = t + 4;
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/* return value is variable, int */
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vt = VT_VAR;
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}
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if (t)
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oad(0xc481, t);
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/* return value is variable, int */
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vt = VT_VAR;
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}
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}
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@ -1005,22 +1111,22 @@ void block()
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}
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}
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/* 'l' is true if local declarations */
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/* 'l' is VT_LOCAL or VT_CONST to define default storage type */
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void decl(l)
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{
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int *a, t, b;
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int *a, t, b, s, align, v, u, n;
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while (b = ist()) {
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while (1) { /* iterate thru each declaration */
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vt = typ(1, b);
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s = 1;
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t = typ(&v, b, &s);
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if (tok == '{') {
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/* patch forward references (XXX: does not work for
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function pointers) */
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if (vat[vc] == 0)
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gsym(vac[vc]);
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/* patch forward references */
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if (vat[v] & VT_FORWARD)
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gsym(vac[v]);
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/* put function address */
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vat[vc] = VT_CONST | VT_LVAL | vt;
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vac[vc] = ind;
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vat[v] = VT_CONST | VT_LVAL | t;
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vac[v] = ind;
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loc = 0;
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o(0xe58955); /* push %ebp, mov %esp, %ebp */
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a = oad(0xec81, 0); /* sub $xxx, %esp */
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@ -1028,17 +1134,44 @@ void decl(l)
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block();
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gsym(rsym);
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o(0xc3c9); /* leave, ret */
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*a = loc; /* save local variables */
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*a = (-loc + 3) & -4; /* align local size to word &
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save local variables */
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break;
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} else {
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/* variable */
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vat[vc] = l | VT_LVAL | vt;
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if (l == VT_LOCAL) {
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loc = loc + 4;
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vac[vc] = -loc;
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if (t & VT_FUNC) {
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/* external function definition */
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external_func(v, t);
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} else {
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vac[vc] = glo;
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glo = glo + 4;
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/* not lvalue if array */
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if (!(t & VT_ARRAY))
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t |= VT_LVAL;
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if (t & VT_EXTERN) {
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/* external variable */
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n = dlsym(NULL, get_tok_str(v));
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if (!n)
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||||
error("unknown external variable");
|
||||
vat[v] = VT_CONST | t;
|
||||
vac[v] = n;
|
||||
} else {
|
||||
u = l;
|
||||
if (t & VT_STATIC)
|
||||
u = VT_CONST;
|
||||
vat[v] = u | t;
|
||||
if (t & VT_ARRAY)
|
||||
t -= VT_PTRINC;
|
||||
align = type_size(t);
|
||||
s *= align;
|
||||
if (u == VT_LOCAL) {
|
||||
/* allocate space down on the stack */
|
||||
loc = (loc - s) & -align;
|
||||
vac[v] = loc;
|
||||
} else {
|
||||
/* allocate space up in the data space */
|
||||
glo = (glo + align - 1) & -align;
|
||||
vac[v] = glo;
|
||||
glo += s;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (tok != ',') {
|
||||
skip(';');
|
||||
|
|
@ -1074,8 +1207,9 @@ int main(int c, char **v)
|
|||
idptr = idtable + 53;
|
||||
#else
|
||||
memcpy(idtable,
|
||||
"int\0void\0char\0if\0else\0while\0break\0return\0define\0main\0for", 57);
|
||||
idptr = idtable + 57;
|
||||
"int\0void\0char\0if\0else\0while\0break\0return\0define\0main\0for\0extern\0static\0unsigned\0goto\0do\0continue\0switch\0case\0const\0long\0register\0signed\0float\0double\0struct\0union\0typedef", 170);
|
||||
|
||||
idptr = idtable + 170;
|
||||
#endif
|
||||
glo = malloc(DATA_SIZE);
|
||||
prog = malloc(TEXT_SIZE);
|
||||
|
|
|
|||
Loading…
Reference in New Issue