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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);
for (unsigned i = 0; i < objectArrayLength(t, trace); ++i) {
object e = objectArrayBody(t, trace, i);
const int8_t* class_ = &byteArrayBody
(t, className(t, methodClass(t, traceElementMethod(t, e))), 0);
const int8_t* method = &byteArrayBody
(t, methodName(t, traceElementMethod(t, e)), 0);
int line = t->m->processor->lineNumber
(t, traceElementMethod(t, e), traceElementIp(t, e));
if (trace) {
for (unsigned i = 0; i < objectArrayLength(t, trace); ++i) {
object e = objectArrayBody(t, trace, i);
const int8_t* class_ = &byteArrayBody
(t, className(t, methodClass(t, traceElementMethod(t, e))), 0);
const int8_t* method = &byteArrayBody
(t, methodName(t, traceElementMethod(t, e)), 0);
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) {
case NativeLine:
fprintf(stderr, "(native)\n");
break;
case UnknownLine:
fprintf(stderr, "(unknown line)\n");
break;
default:
fprintf(stderr, "(line %d)\n", line);
switch (line) {
case NativeLine:
fprintf(stderr, "(native)\n");
break;
case UnknownLine:
fprintf(stderr, "(unknown line)\n");
break;
default:
fprintf(stderr, "(line %d)\n", line);
}
}
}