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don't try to print null exception trace in printTrace

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It is possible to create an Exception with no stack trace by
overriding Throwable.fillInStackTrace, so we can't assume any given
instance will have one.
This commit is contained in:
Joel Dice 2011-03-04 15:58:10 -07:00
parent 4db79b9be6
commit 8fb9523de5
1 changed files with 20 additions and 18 deletions
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38
src/machine.cpp
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@ -3904,26 +3904,28 @@ printTrace(Thread* t, object exception)
} }
object trace = throwableTrace(t, e); object trace = throwableTrace(t, e);
for (unsigned i = 0; i < objectArrayLength(t, trace); ++i) { if (trace) {
object e = objectArrayBody(t, trace, i); for (unsigned i = 0; i < objectArrayLength(t, trace); ++i) {
const int8_t* class_ = &byteArrayBody object e = objectArrayBody(t, trace, i);
(t, className(t, methodClass(t, traceElementMethod(t, e))), 0); const int8_t* class_ = &byteArrayBody
const int8_t* method = &byteArrayBody (t, className(t, methodClass(t, traceElementMethod(t, e))), 0);
(t, methodName(t, traceElementMethod(t, e)), 0); const int8_t* method = &byteArrayBody
int line = t->m->processor->lineNumber (t, methodName(t, traceElementMethod(t, e)), 0);
(t, traceElementMethod(t, e), traceElementIp(t, e)); int line = t->m->processor->lineNumber
(t, traceElementMethod(t, e), traceElementIp(t, e));
fprintf(stderr, " at %s.%s ", class_, method); fprintf(stderr, " at %s.%s ", class_, method);
switch (line) { switch (line) {
case NativeLine: case NativeLine:
fprintf(stderr, "(native)\n"); fprintf(stderr, "(native)\n");
break; break;
case UnknownLine: case UnknownLine:
fprintf(stderr, "(unknown line)\n"); fprintf(stderr, "(unknown line)\n");
break; break;
default: default:
fprintf(stderr, "(line %d)\n", line); fprintf(stderr, "(line %d)\n", line);
}
} }
} }