Alien-TinyCCx

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src/tccasm.c  view on Meta::CPAN

                    tcc_error("local label '%d' not found backward", n);
            } else {
                /* forward */
                if (!sym || sym->r) {
                    /* if the last label is defined, then define a new one */
                    sym = label_push(&s1->asm_labels, label, 0);
                    sym->type.t = VT_STATIC | VT_VOID;
                }
            }
            pe->v = 0;
            pe->sym = sym;
        } else if (*p == '\0') {
            pe->v = n;
            pe->sym = NULL;
        } else {
            tcc_error("invalid number syntax");
        }
        next();
        break;
    case '+':
        next();
        asm_expr_unary(s1, pe);
        break;
    case '-':
    case '~':
        op = tok;
        next();
        asm_expr_unary(s1, pe);
        if (pe->sym)
            tcc_error("invalid operation with label");
        if (op == '-')
            pe->v = -pe->v;
        else
            pe->v = ~pe->v;
        break;
    case TOK_CCHAR:
    case TOK_LCHAR:
	pe->v = tokc.i;
	pe->sym = NULL;
	next();
	break;
    case '(':
        next();
        asm_expr(s1, pe);
        skip(')');
        break;
    case '.':
        pe->v = 0;
        pe->sym = &sym_dot;
        sym_dot.type.t = VT_VOID | VT_STATIC;
        sym_dot.r = cur_text_section->sh_num;
        sym_dot.jnext = ind;
        next();
        break;
    default:
        if (tok >= TOK_IDENT) {
            /* label case : if the label was not found, add one */
            sym = label_find(tok);
            if (!sym) {
                sym = label_push(&s1->asm_labels, tok, 0);
                /* NOTE: by default, the symbol is global */
                sym->type.t = VT_VOID;
            }
            if (sym->r == SHN_ABS) {
                /* if absolute symbol, no need to put a symbol value */
                pe->v = sym->jnext;
                pe->sym = NULL;
            } else {
                pe->v = 0;
                pe->sym = sym;
            }
            next();
        } else {
            tcc_error("bad expression syntax [%s]", get_tok_str(tok, &tokc));
        }
        break;
    }
}
    
static void asm_expr_prod(TCCState *s1, ExprValue *pe)
{
    int op;
    ExprValue e2;

    asm_expr_unary(s1, pe);
    for(;;) {
        op = tok;
        if (op != '*' && op != '/' && op != '%' && 
            op != TOK_SHL && op != TOK_SAR)
            break;
        next();
        asm_expr_unary(s1, &e2);
        if (pe->sym || e2.sym)
            tcc_error("invalid operation with label");
        switch(op) {
        case '*':
            pe->v *= e2.v;
            break;
        case '/':  
            if (e2.v == 0) {
            div_error:
                tcc_error("division by zero");
            }
            pe->v /= e2.v;
            break;
        case '%':  
            if (e2.v == 0)
                goto div_error;
            pe->v %= e2.v;
            break;
        case TOK_SHL:
            pe->v <<= e2.v;
            break;
        default:
        case TOK_SAR:
            pe->v >>= e2.v;
            break;
        }
    }
}

src/tccasm.c  view on Meta::CPAN

                    next();
                    val = asm_int_expr(s1);
                }
            }
            /* XXX: endianness */
            repeat_buf[0] = val;
            repeat_buf[1] = val >> 8;
            repeat_buf[2] = val >> 16;
            repeat_buf[3] = val >> 24;
            repeat_buf[4] = 0;
            repeat_buf[5] = 0;
            repeat_buf[6] = 0;
            repeat_buf[7] = 0;
            for(i = 0; i < repeat; i++) {
                for(j = 0; j < size; j++) {
                    g(repeat_buf[j]);
                }
            }
        }
        break;
    case TOK_ASMDIR_rept:
        {
            int repeat;
            TokenString *init_str;
            ParseState saved_parse_state = {0};
            next();
            repeat = asm_int_expr(s1);
            init_str = tok_str_alloc();
            next();
            while ((tok != TOK_ASMDIR_endr) && (tok != CH_EOF)) {
                tok_str_add_tok(init_str);
                next();
            }
            if (tok == CH_EOF) tcc_error("we at end of file, .endr not found");
            next();
            tok_str_add(init_str, -1);
            tok_str_add(init_str, 0);
            save_parse_state(&saved_parse_state);
            begin_macro(init_str, 1);
            while (repeat-- > 0) {
                tcc_assemble_internal(s1, (parse_flags & PARSE_FLAG_PREPROCESS));
                macro_ptr = init_str->str;
            }
            end_macro();
            restore_parse_state(&saved_parse_state);
            break;
        }
    case TOK_ASMDIR_org:
        {
            unsigned long n;
            next();
            /* XXX: handle section symbols too */
            n = asm_int_expr(s1);
            if (n < ind)
                tcc_error("attempt to .org backwards");
            v = 0;
            size = n - ind;
            goto zero_pad;
        }
        break;
    case TOK_ASMDIR_globl:
    case TOK_ASMDIR_global:
    case TOK_ASMDIR_weak:
    case TOK_ASMDIR_hidden:
    tok1 = tok;
	do { 
            Sym *sym;

            next();
            sym = label_find(tok);
            if (!sym) {
                sym = label_push(&s1->asm_labels, tok, 0);
                sym->type.t = VT_VOID;
            }
	    if (tok1 != TOK_ASMDIR_hidden)
                sym->type.t &= ~VT_STATIC;
            if (tok1 == TOK_ASMDIR_weak)
                sym->type.t |= VT_WEAK;
	    else if (tok1 == TOK_ASMDIR_hidden)
	        sym->type.t |= STV_HIDDEN << VT_VIS_SHIFT;
            next();
	} while (tok == ',');
	break;
    case TOK_ASMDIR_string:
    case TOK_ASMDIR_ascii:
    case TOK_ASMDIR_asciz:
        {
            const uint8_t *p;
            int i, size, t;

            t = tok;
            next();
            for(;;) {
                if (tok != TOK_STR)
                    expect("string constant");
                p = tokc.str.data;
                size = tokc.str.size;
                if (t == TOK_ASMDIR_ascii && size > 0)
                    size--;
                for(i = 0; i < size; i++)
                    g(p[i]);
                next();
                if (tok == ',') {
                    next();
                } else if (tok != TOK_STR) {
                    break;
                }
            }
	}
	break;
    case TOK_ASMDIR_text:
    case TOK_ASMDIR_data:
    case TOK_ASMDIR_bss:
	{ 
            char sname[64];
            tok1 = tok;
            n = 0;
            next();
            if (tok != ';' && tok != TOK_LINEFEED) {
		n = asm_int_expr(s1);
		next();
            }

src/tccasm.c  view on Meta::CPAN

        memset(freq, 0, sizeof(freq));
        for(pa = asm_instrs; pa->sym != 0; pa++) {
            freq[pa->nb_ops]++;
            for(i=0;i<pa->nb_ops;i++) {
                for(j=0;j<nb_op_vals;j++) {
                    if (pa->op_type[i] == op_vals[j])
                        goto found;
                }
                op_vals[nb_op_vals++] = pa->op_type[i];
            found: ;
            }
        }
        for(i=0;i<nb_op_vals;i++) {
            int v = op_vals[i];
            if ((v & (v - 1)) != 0)
                printf("%3d: %08x\n", i, v);
        }
        printf("size=%d nb=%d f0=%d f1=%d f2=%d f3=%d\n",
               sizeof(asm_instrs), sizeof(asm_instrs) / sizeof(ASMInstr),
               freq[0], freq[1], freq[2], freq[3]);
    }
#endif

    /* XXX: undefine C labels */

    ch = file->buf_ptr[0];
    tok_flags = TOK_FLAG_BOL | TOK_FLAG_BOF;
    parse_flags = PARSE_FLAG_ASM_FILE | PARSE_FLAG_TOK_STR;
    if (do_preprocess)
        parse_flags |= PARSE_FLAG_PREPROCESS;
    next();
    for(;;) {
        if (tok == TOK_EOF)
            break;
        parse_flags |= PARSE_FLAG_LINEFEED; /* XXX: suppress that hack */
    redo:
        if (tok == '#') {
            /* horrible gas comment */
            while (tok != TOK_LINEFEED)
                next();
        } else if (tok >= TOK_ASMDIR_FIRST && tok <= TOK_ASMDIR_LAST) {
            asm_parse_directive(s1);
        } else if (tok == TOK_PPNUM) {
            const char *p;
            int n;
            p = tokc.str.data;
            n = strtoul(p, (char **)&p, 10);
            if (*p != '\0')
                expect("':'");
            /* new local label */
            asm_new_label(s1, asm_get_local_label_name(s1, n), 1);
            next();
            skip(':');
            goto redo;
        } else if (tok >= TOK_IDENT) {
            /* instruction or label */
            opcode = tok;
            next();
            if (tok == ':') {
                /* handle "extern void vide(void); __asm__("vide: ret");" as
                "__asm__("globl vide\nvide: ret");" */
                Sym *sym = sym_find(opcode);
                if (sym && (sym->type.t & VT_EXTERN) && nocode_wanted) {
                    sym = label_find(opcode);
                    if (!sym) {
                        sym = label_push(&s1->asm_labels, opcode, 0);
                        sym->type.t = VT_VOID;
                    }
                }
                /* new label */
                asm_new_label(s1, opcode, 0);
                next();
                goto redo;
            } else if (tok == '=') {
                int n;
                next();
                n = asm_int_expr(s1);
                asm_new_label1(s1, opcode, 0, SHN_ABS, n);
                goto redo;
            } else {
                asm_opcode(s1, opcode);
            }
        }
        /* end of line */
        if (tok != ';' && tok != TOK_LINEFEED){
            expect("end of line");
        }
        parse_flags &= ~PARSE_FLAG_LINEFEED; /* XXX: suppress that hack */
        next();
    }

    asm_free_labels(s1);

    return 0;
}

/* Assemble the current file */
ST_FUNC int tcc_assemble(TCCState *s1, int do_preprocess)
{
    Sym *define_start;
    int ret;

    preprocess_start(s1);

    /* default section is text */
    cur_text_section = text_section;
    ind = cur_text_section->data_offset;

    define_start = define_stack;

    /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
       symbols can be safely used */
    put_elf_sym(symtab_section, 0, 0,
                ELFW(ST_INFO)(STB_LOCAL, STT_FILE), 0,
                SHN_ABS, file->filename);

    ret = tcc_assemble_internal(s1, do_preprocess);

    cur_text_section->data_offset = ind;

    free_defines(define_start); 

src/tccasm.c  view on Meta::CPAN

                        } else {
                            break;
                        }
                    }
                }
            }
        }
    }
    skip(')');
    /* NOTE: we do not eat the ';' so that we can restore the current
       token after the assembler parsing */
    if (tok != ';')
        expect("';'");
    
    /* save all values in the memory */
    save_regs(0);

    /* compute constraints */
    asm_compute_constraints(operands, nb_operands, nb_outputs, 
                            clobber_regs, &out_reg);

    /* substitute the operands in the asm string. No substitution is
       done if no operands (GCC behaviour) */
#ifdef ASM_DEBUG
    printf("asm: \"%s\"\n", (char *)astr.data);
#endif
    if (must_subst) {
        subst_asm_operands(operands, nb_operands, nb_outputs, &astr1, &astr);
        cstr_free(&astr);
    } else {
        astr1 = astr;
    }
#ifdef ASM_DEBUG
    printf("subst_asm: \"%s\"\n", (char *)astr1.data);
#endif

    /* generate loads */
    asm_gen_code(operands, nb_operands, nb_outputs, 0, 
                 clobber_regs, out_reg);    

    /* assemble the string with tcc internal assembler */
    tcc_assemble_inline(tcc_state, astr1.data, astr1.size - 1);

    /* restore the current C token */
    next();

    /* store the output values if needed */
    asm_gen_code(operands, nb_operands, nb_outputs, 1, 
                 clobber_regs, out_reg);
    
    /* free everything */
    for(i=0;i<nb_operands;i++) {
        ASMOperand *op;
        op = &operands[i];
        tcc_free(op->constraint);
        vpop();
    }
    cstr_free(&astr1);
}

ST_FUNC void asm_global_instr(void)
{
    CString astr;

    next();
    parse_asm_str(&astr);
    skip(')');
    /* NOTE: we do not eat the ';' so that we can restore the current
       token after the assembler parsing */
    if (tok != ';')
        expect("';'");
    
#ifdef ASM_DEBUG
    printf("asm_global: \"%s\"\n", (char *)astr.data);
#endif
    cur_text_section = text_section;
    ind = cur_text_section->data_offset;

    /* assemble the string with tcc internal assembler */
    tcc_assemble_inline(tcc_state, astr.data, astr.size - 1);
    
    cur_text_section->data_offset = ind;

    /* restore the current C token */
    next();

    cstr_free(&astr);
}
#endif /* CONFIG_TCC_ASM */