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[/] [eco32/] [trunk/] [lcc/] [src/] [tree.c] - Blame information for rev 4

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#include "c.h"
 
static char rcsid[] = "$Id: tree.c,v 1.1 2002/08/28 23:12:47 drh Exp $";
 
int where = STMT;
static int warn;
static int nid = 1;             /* identifies trees & nodes in debugging output */
static struct nodeid {
        int printed;
        Tree node;
} ids[500];                     /* if ids[i].node == p, then p's id is i */
 
static void printtree1(Tree, int, int);
 
Tree tree(int op, Type type, Tree left, Tree right) {
        Tree p;
 
        NEW0(p, where);
        p->op = op;
        p->type = type;
        p->kids[0] = left;
        p->kids[1] = right;
        return p;
}
 
Tree texpr(Tree (*f)(int), int tok, int a) {
        int save = where;
        Tree p;
 
        where = a;
        p = (*f)(tok);
        where = save;
        return p;
}
static Tree root1(Tree p) {
        if (p == NULL)
                return p;
        if (p->type == voidtype)
                warn++;
        switch (generic(p->op)) {
        case COND: {
                Tree q = p->kids[1];
                assert(q && q->op == RIGHT);
                if (p->u.sym && q->kids[0] && generic(q->kids[0]->op) == ASGN)
                        q->kids[0] = root1(q->kids[0]->kids[1]);
                else
                        q->kids[0] = root1(q->kids[0]);
                if (p->u.sym && q->kids[1] && generic(q->kids[1]->op) == ASGN)
                        q->kids[1] = root1(q->kids[1]->kids[1]);
                else
                        q->kids[1] = root1(q->kids[1]);
                p->u.sym = 0;
                if (q->kids[0] == 0 && q->kids[1] == 0)
                        p = root1(p->kids[0]);
                }
                break;
        case AND: case OR:
                if ((p->kids[1] = root1(p->kids[1])) == 0)
                        p = root1(p->kids[0]);
                break;
        case NOT:
                if (warn++ == 0)
                        warning("expression with no effect elided\n");
                return root1(p->kids[0]);
        case RIGHT:
                if (p->kids[1] == 0)
                        return root1(p->kids[0]);
                if (p->kids[0] && p->kids[0]->op == CALL+B
                &&  p->kids[1] && p->kids[1]->op == INDIR+B)
                        /* avoid premature release of the CALL+B temporary */
                        return p->kids[0];
                if (p->kids[0] && p->kids[0]->op == RIGHT
                &&  p->kids[1] == p->kids[0]->kids[0])
                        /* de-construct e++ construction */
                        return p->kids[0]->kids[1];
                p = tree(RIGHT, p->type, root1(p->kids[0]), root1(p->kids[1]));
                return p->kids[0] || p->kids[1] ? p : (Tree)0;
        case EQ:  case NE:  case GT:   case GE:  case LE:  case LT:
        case ADD: case SUB: case MUL:  case DIV: case MOD:
        case LSH: case RSH: case BAND: case BOR: case BXOR:
                if (warn++ == 0)
                        warning("expression with no effect elided\n");
                p = tree(RIGHT, p->type, root1(p->kids[0]), root1(p->kids[1]));
                return p->kids[0] || p->kids[1] ? p : (Tree)0;
        case INDIR:
                if (p->type->size == 0 && unqual(p->type) != voidtype)
                        warning("reference to `%t' elided\n", p->type);
                if (isptr(p->kids[0]->type) && isvolatile(p->kids[0]->type->type))
                        warning("reference to `volatile %t' elided\n", p->type);
                /* fall thru */
        case NEG: case BCOM: case FIELD:
                if (warn++ == 0)
                        warning("expression with no effect elided\n");
                return root1(p->kids[0]);
        case ADDRL: case ADDRG: case ADDRF: case CNST:
                if (needconst)
                        return p;
                if (warn++ == 0)
                        warning("expression with no effect elided\n");
                return NULL;
        case CVF:
                if (optype(p->op) == I
                || p->type->size < p->kids[0]->type->size)
                        if (warn++ == 0)
                                warning("expression with no effect elided\n");
                return root1(p->kids[0]);
        case CVI:
                if ((optype(p->op) == U || optype(p->op) == I)
                && p->type->size < p->kids[0]->type->size
                && specific(p->kids[0]->op) != CALL+I)
                        if (warn++ == 0)
                                warning("expression with no effect elided\n");
                return root1(p->kids[0]);
        case CVU: case CVP:
                if (optype(p->op) == U && p->type->size <  p->kids[0]->type->size
                ||  optype(p->op) == I && p->type->size <= p->kids[0]->type->size)
                        if (warn++ == 0)
                                warning("expression with no effect elided\n");
                return root1(p->kids[0]);
        case ARG: case ASGN: case CALL: case JUMP: case LABEL:
                break;
        default: assert(0);
        }
        return p;
}
 
Tree root(Tree p) {
        warn = 0;
        return root1(p);
}
 
char *opname(int op) {
        static char *opnames[] = {
        "",
        "CNST",
        "ARG",
        "ASGN",
        "INDIR",
        "CVC",
        "CVD",
        "CVF",
        "CVI",
        "CVP",
        "CVS",
        "CVU",
        "NEG",
        "CALL",
        "*LOAD*",
        "RET",
        "ADDRG",
        "ADDRF",
        "ADDRL",
        "ADD",
        "SUB",
        "LSH",
        "MOD",
        "RSH",
        "BAND",
        "BCOM",
        "BOR",
        "BXOR",
        "DIV",
        "MUL",
        "EQ",
        "GE",
        "GT",
        "LE",
        "LT",
        "NE",
        "JUMP",
        "LABEL",
        "AND",
        "NOT",
        "OR",
        "COND",
        "RIGHT",
        "FIELD"
        }, *suffixes[] = {
                "0", "F", "D", "C", "S", "I", "U", "P", "V", "B",
                "10","11","12","13","14","15"
        };
 
        if (generic(op) >= AND && generic(op) <= FIELD && opsize(op) == 0)
                return opnames[opindex(op)];
        return stringf("%s%s%s",
                opindex(op) > 0 && opindex(op) < NELEMS(opnames) ?
                        opnames[opindex(op)] : stringd(opindex(op)),
                suffixes[optype(op)], opsize(op) > 0 ? stringd(opsize(op)) : "");
}
 
int nodeid(Tree p) {
        int i = 1;
 
        ids[nid].node = p;
        while (ids[i].node != p)
                i++;
        if (i == nid)
                ids[nid++].printed = 0;
        return i;
}
 
/* printed - return pointer to ids[id].printed */
int *printed(int id) {
        if (id)
                return &ids[id].printed;
        nid = 1;
        return 0;
}
 
/* printtree - print tree p on fd */
void printtree(Tree p, int fd) {
        (void)printed(0);
        printtree1(p, fd, 1);
}
 
/* printtree1 - recursively print tree p */
static void printtree1(Tree p, int fd, int lev) {
        FILE *f = fd == 1 ? stdout : stderr;
        int i;
        static char blanks[] = "                                                   ";
 
        if (p == 0 || *printed(i = nodeid(p)))
                return;
        fprint(f, "#%d%S%S", i, blanks, i < 10 ? 2 : i < 100 ? 1 : 0, blanks, lev);
        fprint(f, "%s %t", opname(p->op), p->type);
        *printed(i) = 1;
        for (i = 0; i < NELEMS(p->kids); i++)
                if (p->kids[i])
                        fprint(f, " #%d", nodeid(p->kids[i]));
        if (p->op == FIELD && p->u.field)
                fprint(f, " %s %d..%d", p->u.field->name,
                        fieldsize(p->u.field) + fieldright(p->u.field), fieldright(p->u.field));
        else if (generic(p->op) == CNST)
                fprint(f, " %s", vtoa(p->type, p->u.v));
        else if (p->u.sym)
                fprint(f, " %s", p->u.sym->name);
        if (p->node)
                fprint(f, " node=%p", p->node);
        fprint(f, "\n");
        for (i = 0; i < NELEMS(p->kids); i++)
                printtree1(p->kids[i], fd, lev + 1);
}

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[/] [eco32/] [trunk/] [lcc/] [src/] [tree.c] - Blame information for rev 4

Line No.	Rev	Author	Line
1	4	hellwig	`#include "c.h"`
2
3			`static char rcsid[] = "$Id: tree.c,v 1.1 2002/08/28 23:12:47 drh Exp $";`
4
5			`int where = STMT;`
6			`static int warn;`
7			`static int nid = 1; /* identifies trees & nodes in debugging output */`
8			`static struct nodeid {`
9			`int printed;`
10			`Tree node;`
11			`} ids[500]; /* if ids[i].node == p, then p's id is i */`
12
13			`static void printtree1(Tree, int, int);`
14
15			`Tree tree(int op, Type type, Tree left, Tree right) {`
16			`Tree p;`
17
18			`NEW0(p, where);`
19			`p->op = op;`
20			`p->type = type;`
21			`p->kids[0] = left;`
22			`p->kids[1] = right;`
23			`return p;`
24			`}`
25
26			`Tree texpr(Tree (*f)(int), int tok, int a) {`
27			`int save = where;`
28			`Tree p;`
29
30			`where = a;`
31			`p = (*f)(tok);`
32			`where = save;`
33			`return p;`
34			`}`
35			`static Tree root1(Tree p) {`
36			`if (p == NULL)`
37			`return p;`
38			`if (p->type == voidtype)`
39			`warn++;`
40			`switch (generic(p->op)) {`
41			`case COND: {`
42			`Tree q = p->kids[1];`
43			`assert(q && q->op == RIGHT);`
44			`if (p->u.sym && q->kids[0] && generic(q->kids[0]->op) == ASGN)`
45			`q->kids[0] = root1(q->kids[0]->kids[1]);`
46			`else`
47			`q->kids[0] = root1(q->kids[0]);`
48			`if (p->u.sym && q->kids[1] && generic(q->kids[1]->op) == ASGN)`
49			`q->kids[1] = root1(q->kids[1]->kids[1]);`
50			`else`
51			`q->kids[1] = root1(q->kids[1]);`
52			`p->u.sym = 0;`
53			`if (q->kids[0] == 0 && q->kids[1] == 0)`
54			`p = root1(p->kids[0]);`
55			`}`
56			`break;`
57			`case AND: case OR:`
58			`if ((p->kids[1] = root1(p->kids[1])) == 0)`
59			`p = root1(p->kids[0]);`
60			`break;`
61			`case NOT:`
62			`if (warn++ == 0)`
63			`warning("expression with no effect elided\n");`
64			`return root1(p->kids[0]);`
65			`case RIGHT:`
66			`if (p->kids[1] == 0)`
67			`return root1(p->kids[0]);`
68			`if (p->kids[0] && p->kids[0]->op == CALL+B`
69			`&& p->kids[1] && p->kids[1]->op == INDIR+B)`
70			`/* avoid premature release of the CALL+B temporary */`
71			`return p->kids[0];`
72			`if (p->kids[0] && p->kids[0]->op == RIGHT`
73			`&& p->kids[1] == p->kids[0]->kids[0])`
74			`/* de-construct e++ construction */`
75			`return p->kids[0]->kids[1];`
76			`p = tree(RIGHT, p->type, root1(p->kids[0]), root1(p->kids[1]));`
77			`return p->kids[0] \|\| p->kids[1] ? p : (Tree)0;`
78			`case EQ: case NE: case GT: case GE: case LE: case LT:`
79			`case ADD: case SUB: case MUL: case DIV: case MOD:`
80			`case LSH: case RSH: case BAND: case BOR: case BXOR:`
81			`if (warn++ == 0)`
82			`warning("expression with no effect elided\n");`
83			`p = tree(RIGHT, p->type, root1(p->kids[0]), root1(p->kids[1]));`
84			`return p->kids[0] \|\| p->kids[1] ? p : (Tree)0;`
85			`case INDIR:`
86			`if (p->type->size == 0 && unqual(p->type) != voidtype)`
87			warning("reference to `%t' elided\n", p->type);
88			`if (isptr(p->kids[0]->type) && isvolatile(p->kids[0]->type->type))`
89			warning("reference to `volatile %t' elided\n", p->type);
90			`/* fall thru */`
91			`case NEG: case BCOM: case FIELD:`
92			`if (warn++ == 0)`
93			`warning("expression with no effect elided\n");`
94			`return root1(p->kids[0]);`
95			`case ADDRL: case ADDRG: case ADDRF: case CNST:`
96			`if (needconst)`
97			`return p;`
98			`if (warn++ == 0)`
99			`warning("expression with no effect elided\n");`
100			`return NULL;`
101			`case CVF:`
102			`if (optype(p->op) == I`
103			`\|\| p->type->size < p->kids[0]->type->size)`
104			`if (warn++ == 0)`
105			`warning("expression with no effect elided\n");`
106			`return root1(p->kids[0]);`
107			`case CVI:`
108			`if ((optype(p->op) == U \|\| optype(p->op) == I)`
109			`&& p->type->size < p->kids[0]->type->size`
110			`&& specific(p->kids[0]->op) != CALL+I)`
111			`if (warn++ == 0)`
112			`warning("expression with no effect elided\n");`
113			`return root1(p->kids[0]);`
114			`case CVU: case CVP:`
115			`if (optype(p->op) == U && p->type->size < p->kids[0]->type->size`
116			`\|\| optype(p->op) == I && p->type->size <= p->kids[0]->type->size)`
117			`if (warn++ == 0)`
118			`warning("expression with no effect elided\n");`
119			`return root1(p->kids[0]);`
120			`case ARG: case ASGN: case CALL: case JUMP: case LABEL:`
121			`break;`
122			`default: assert(0);`
123			`}`
124			`return p;`
125			`}`
126
127			`Tree root(Tree p) {`
128			`warn = 0;`
129			`return root1(p);`
130			`}`
131
132			`char *opname(int op) {`
133			`static char *opnames[] = {`
134			`"",`
135			`"CNST",`
136			`"ARG",`
137			`"ASGN",`
138			`"INDIR",`
139			`"CVC",`
140			`"CVD",`
141			`"CVF",`
142			`"CVI",`
143			`"CVP",`
144			`"CVS",`
145			`"CVU",`
146			`"NEG",`
147			`"CALL",`
148			`"LOAD",`
149			`"RET",`
150			`"ADDRG",`
151			`"ADDRF",`
152			`"ADDRL",`
153			`"ADD",`
154			`"SUB",`
155			`"LSH",`
156			`"MOD",`
157			`"RSH",`
158			`"BAND",`
159			`"BCOM",`
160			`"BOR",`
161			`"BXOR",`
162			`"DIV",`
163			`"MUL",`
164			`"EQ",`
165			`"GE",`
166			`"GT",`
167			`"LE",`
168			`"LT",`
169			`"NE",`
170			`"JUMP",`
171			`"LABEL",`
172			`"AND",`
173			`"NOT",`
174			`"OR",`
175			`"COND",`
176			`"RIGHT",`
177			`"FIELD"`
178			`}, *suffixes[] = {`
179			`"0", "F", "D", "C", "S", "I", "U", "P", "V", "B",`
180			`"10","11","12","13","14","15"`
181			`};`
182
183			`if (generic(op) >= AND && generic(op) <= FIELD && opsize(op) == 0)`
184			`return opnames[opindex(op)];`
185			`return stringf("%s%s%s",`
186			`opindex(op) > 0 && opindex(op) < NELEMS(opnames) ?`
187			`opnames[opindex(op)] : stringd(opindex(op)),`
188			`suffixes[optype(op)], opsize(op) > 0 ? stringd(opsize(op)) : "");`
189			`}`
190
191			`int nodeid(Tree p) {`
192			`int i = 1;`
193
194			`ids[nid].node = p;`
195			`while (ids[i].node != p)`
196			`i++;`
197			`if (i == nid)`
198			`ids[nid++].printed = 0;`
199			`return i;`
200			`}`
201
202			`/* printed - return pointer to ids[id].printed */`
203			`int *printed(int id) {`
204			`if (id)`
205			`return &ids[id].printed;`
206			`nid = 1;`
207			`return 0;`
208			`}`
209
210			`/* printtree - print tree p on fd */`
211			`void printtree(Tree p, int fd) {`
212			`(void)printed(0);`
213			`printtree1(p, fd, 1);`
214			`}`
215
216			`/* printtree1 - recursively print tree p */`
217			`static void printtree1(Tree p, int fd, int lev) {`
218			`FILE *f = fd == 1 ? stdout : stderr;`
219			`int i;`
220			`static char blanks[] = " ";`
221
222			`if (p == 0 \|\| *printed(i = nodeid(p)))`
223			`return;`
224			`fprint(f, "#%d%S%S", i, blanks, i < 10 ? 2 : i < 100 ? 1 : 0, blanks, lev);`
225			`fprint(f, "%s %t", opname(p->op), p->type);`
226			`*printed(i) = 1;`
227			`for (i = 0; i < NELEMS(p->kids); i++)`
228			`if (p->kids[i])`
229			`fprint(f, " #%d", nodeid(p->kids[i]));`
230			`if (p->op == FIELD && p->u.field)`
231			`fprint(f, " %s %d..%d", p->u.field->name,`
232			`fieldsize(p->u.field) + fieldright(p->u.field), fieldright(p->u.field));`
233			`else if (generic(p->op) == CNST)`
234			`fprint(f, " %s", vtoa(p->type, p->u.v));`
235			`else if (p->u.sym)`
236			`fprint(f, " %s", p->u.sym->name);`
237			`if (p->node)`
238			`fprint(f, " node=%p", p->node);`
239			`fprint(f, "\n");`
240			`for (i = 0; i < NELEMS(p->kids); i++)`
241			`printtree1(p->kids[i], fd, lev + 1);`
242			`}`