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hellwig |
#include "c.h"
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static char rcsid[] = "$Id: trace.c,v 1.1 2002/08/28 23:12:47 drh Exp $";
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static char *fmt, *fp, *fmtend; /* format string, current & limit pointer */
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static Tree args; /* printf arguments */
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static Symbol frameno; /* local holding frame number */
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/* appendstr - append str to the evolving format string, expanding it if necessary */
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static void appendstr(char *str) {
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do
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if (fp == fmtend)
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if (fp) {
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char *s = allocate(2*(fmtend - fmt), FUNC);
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strncpy(s, fmt, fmtend - fmt);
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fp = s + (fmtend - fmt);
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fmtend = s + 2*(fmtend - fmt);
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fmt = s;
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} else {
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fp = fmt = allocate(80, FUNC);
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fmtend = fmt + 80;
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}
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while ((*fp++ = *str++) != 0);
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fp--;
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}
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/* tracevalue - append format and argument to print the value of e */
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static void tracevalue(Tree e, int lev) {
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Type ty = unqual(e->type);
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switch (ty->op) {
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case INT:
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if (ty == chartype || ty == signedchar)
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appendstr("'\\x%02x'");
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else if (ty == longtype)
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appendstr("0x%ld");
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else
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appendstr("0x%d");
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break;
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case UNSIGNED:
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if (ty == chartype || ty == unsignedchar)
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appendstr("'\\x%02x'");
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else if (ty == unsignedlong)
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appendstr("0x%lx");
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else
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appendstr("0x%x");
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break;
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case FLOAT:
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if (ty == longdouble)
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appendstr("%Lg");
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else
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appendstr("%g");
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break;
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case POINTER:
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if (unqual(ty->type) == chartype
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|| unqual(ty->type) == signedchar
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|| unqual(ty->type) == unsignedchar) {
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static Symbol null;
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if (null == NULL)
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null = mkstr("(null)");
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tracevalue(cast(e, unsignedtype), lev + 1);
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appendstr(" \"%.30s\"");
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e = condtree(e, e, pointer(idtree(null->u.c.loc)));
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} else {
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appendstr("("); appendstr(typestring(ty, "")); appendstr(")0x%x");
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}
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break;
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case STRUCT: {
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Field q;
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appendstr("("); appendstr(typestring(ty, "")); appendstr("){");
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for (q = ty->u.sym->u.s.flist; q; q = q->link) {
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appendstr(q->name); appendstr("=");
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tracevalue(field(addrof(e), q->name), lev + 1);
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if (q->link)
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appendstr(",");
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}
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appendstr("}");
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return;
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}
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case UNION:
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appendstr("("); appendstr(typestring(ty, "")); appendstr("){...}");
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return;
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case ARRAY:
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if (lev && ty->type->size > 0) {
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int i;
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e = pointer(e);
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appendstr("{");
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for (i = 0; i < ty->size/ty->type->size; i++) {
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Tree p = (*optree['+'])(ADD, e, consttree(i, inttype));
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if (isptr(p->type) && isarray(p->type->type))
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p = retype(p, p->type->type);
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else
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p = rvalue(p);
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if (i)
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appendstr(",");
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tracevalue(p, lev + 1);
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}
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appendstr("}");
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} else
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appendstr(typestring(ty, ""));
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return;
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default:
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assert(0);
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}
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e = cast(e, promote(ty));
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args = tree(mkop(ARG,e->type), e->type, e, args);
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}
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/* tracefinis - complete & generate the trace call to print */
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static void tracefinis(Symbol printer) {
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Tree *ap;
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Symbol p;
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*fp = 0;
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p = mkstr(string(fmt));
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for (ap = &args; *ap; ap = &(*ap)->kids[1])
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;
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*ap = tree(ARG+P, charptype, pointer(idtree(p->u.c.loc)), 0);
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walk(calltree(pointer(idtree(printer)), freturn(printer->type), args, NULL), 0, 0);
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args = 0;
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fp = fmtend = 0;
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}
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/* tracecall - generate code to trace entry to f */
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static void tracecall(Symbol printer, Symbol f, void *ignore) {
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int i;
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Symbol counter = genident(STATIC, inttype, GLOBAL);
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defglobal(counter, BSS);
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(*IR->space)(counter->type->size);
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frameno = genident(AUTO, inttype, level);
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addlocal(frameno);
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appendstr(f->name); appendstr("#");
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tracevalue(asgn(frameno, incr(INCR, idtree(counter), consttree(1, inttype))), 0);
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appendstr("(");
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for (i = 0; f->u.f.callee[i]; i++) {
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if (i)
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appendstr(",");
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appendstr(f->u.f.callee[i]->name); appendstr("=");
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tracevalue(idtree(f->u.f.callee[i]), 0);
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}
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if (variadic(f->type))
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appendstr(",...");
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appendstr(") called\n");
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tracefinis(printer);
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}
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/* tracereturn - generate code to trace return e */
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static void tracereturn(Symbol printer, Symbol f, Tree e) {
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appendstr(f->name); appendstr("#");
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tracevalue(idtree(frameno), 0);
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appendstr(" returned");
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if (freturn(f->type) != voidtype && e) {
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appendstr(" ");
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tracevalue(e, 0);
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}
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appendstr("\n");
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tracefinis(printer);
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}
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/* traceInit - initialize for tracing */
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void traceInit(char *arg) {
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if (strncmp(arg, "-t", 2) == 0 && strchr(arg, '=') == NULL) {
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Symbol printer = mksymbol(EXTERN, arg[2] ? &arg[2] : "printf",
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ftype(inttype, ptr(qual(CONST, chartype)), voidtype, NULL));
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printer->defined = 0;
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attach((Apply)tracecall, printer, &events.entry);
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attach((Apply)tracereturn, printer, &events.returns);
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}
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}
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