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Annotation of researchv9/cmd/cfront/munch.c, revision 1.1

1.1     ! root        1: /*
        !             2:        scan nm output and detect constructors and destructors for static objects.
        !             3:        the name on an nm output line is expected to be in the right hand margin.
        !             4:        the name is expected to be on the form __STD*_ or __STI*_ and less than
        !             5:        100 characters long.
        !             6:        nm output lines are assumed to be less than 256 characters long.
        !             7:        constructors found are called by _main() called from main().
        !             8:        destructors found is called by exit().
        !             9:        return 0 if no constructor or destructor is found otherwise.
        !            10:        The output is ?
        !            11:        
        !            12: */
        !            13: 
        !            14: #include <stdio.h>
        !            15: //extern int strcpy(char*, char*);
        !            16: //extern char * strtok(char*, char*);
        !            17: 
        !            18: struct sbuf {
        !            19:        sbuf* next;
        !            20:        char str[100];
        !            21:        sbuf(sbuf* l, char* p);
        !            22: };
        !            23: 
        !            24: sbuf::sbuf(sbuf* l, char* p)
        !            25: {
        !            26:        next=l;
        !            27:        // strcpy(str,strtok(p," |"));
        !            28:        // ``unrolled'' since strtok() is not on bsd systems
        !            29:        register char* s = str;
        !            30:        for (register char c = *p++; c && c!=' ' && c!='|'; c = *p++) *s++ = c;
        !            31:        *s = 0; 
        !            32: }
        !            33: 
        !            34: sbuf* dtor;    // list of constructors
        !            35: sbuf* ctor;    // list of destructors
        !            36: 
        !            37: void _main() { };      // make munch.c independent of libC.a
        !            38: char* malloc(unsigned);
        !            39: void* operator new(long s) { return malloc(s); }
        !            40: 
        !            41: main (int, char* argv[])
        !            42: {
        !            43:        char buf[256];
        !            44:        register char* p;
        !            45: 
        !            46: newline:
        !            47:        p = buf;
        !            48:        for(;;) {
        !            49:                int c;
        !            50:                switch (c=getchar()) {
        !            51:                case EOF:
        !            52:                        goto done;
        !            53:                case '\n':
        !            54:                {       if (p == buf) goto newline;     // ignore empty lines
        !            55:                        *p = 0;                         // terminate string
        !            56:                        p = buf;
        !            57:                        while (*p++!='_') if (*p == 0) goto newline;
        !            58:                        if (p[-2] == '.') goto newline; // RT: ignore ._STI
        !            59:                        for (p--; *p == '_'; p++) ;     // accept _STI and __STI
        !            60:                        register char* st = p-1;
        !            61:                        if (st[0]!='_' || st[1]!='S' || st[2]!='T') goto newline;
        !            62:                        switch (st[3]) {
        !            63:                        case 'D':
        !            64:                                dtor = new sbuf(dtor,st);
        !            65:                                goto newline;
        !            66:                        case 'I':
        !            67:                                ctor = new sbuf(ctor,st);
        !            68:                        default:
        !            69:                                goto newline;
        !            70:                        }
        !            71:                }
        !            72:                default:
        !            73:                        *p++ = c;
        !            74:                }
        !            75:        }
        !            76: 
        !            77: done:
        !            78:        int cond = dtor||ctor;
        !            79: 
        !            80:        if (cond == 0) exit(0);
        !            81: 
        !            82:        printf("typedef int (*PFV)();\n");      // "int" to dodge bsd4.2 bug
        !            83:        if (ctor) {
        !            84:                for (sbuf* p = ctor; p; p=p->next) printf("int %s();\n",p->str);
        !            85:                printf("extern PFV _ctors[];\nPFV _ctors[] = {\n");
        !            86:                for (sbuf* q = ctor; q; q=q->next) printf("\t%s,\n",q->str);
        !            87:                printf("\t0\n};\n");
        !            88:        }
        !            89: 
        !            90:        if (dtor) {
        !            91:                for (sbuf* p = dtor; p; p=p->next) printf("int %s();\n",p->str);
        !            92:                printf("extern PFV _dtors[];\nPFV _dtors[] = {\n");
        !            93:                for (sbuf* q = dtor; q; q=q->next) printf("\t%s,\n",q->str);
        !            94:                printf("\t0\n};\n");
        !            95:        }
        !            96: 
        !            97:        exit(1);
        !            98: }

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