// We need to skip the NativeCallStack::NativeCallStack frame if a tail call is NOT used // to call os::get_native_stack. A tail call is used if _NMT_NOINLINE_ is not defined // (which means this is not a slowdebug build), and we are on 64-bit (except Windows). // This is not necessarily a rule, but what has been obvserved to date. #if (defined(_NMT_NOINLINE_) || defined(_WINDOWS) || !defined(_LP64) || defined(PPC64) || (defined(BSD) && defined (__aarch64__))) // Not a tail call.
toSkip++; #if (defined(_NMT_NOINLINE_) && defined(BSD) && defined(_LP64)) // Mac OS X slowdebug builds have this odd behavior where NativeCallStack::NativeCallStack // appears as two frames, so we need to skip an extra frame.
toSkip++; #endif// Special-case for BSD. #endif// Not a tail call.
os::get_native_stack(_stack, NMT_TrackingStackDepth, toSkip);
}
NativeCallStack::NativeCallStack(address* pc, int frameCount) {
int frameToCopy = (frameCount < NMT_TrackingStackDepth) ?
frameCount : NMT_TrackingStackDepth;
int index;
for (index = 0; index < frameToCopy; index ++) {
_stack[index] = pc[index];
}
for (; index < NMT_TrackingStackDepth; index ++) {
_stack[index] = NULL;
}
}
// number of stack frames captured
int NativeCallStack::frames() const {
int index;
for (index = 0; index < NMT_TrackingStackDepth; index ++) {
if (_stack[index] == NULL) { break;
}
} return index;
}
// Decode and print this call path void NativeCallStack::print_on(outputStream* out, int indent) const {
DEBUG_ONLY(assert_not_fake();)
address pc;
char buf[1024];
int offset;
if (is_empty()) {
for (int index = 0; index < indent; index ++) out->print(" ");
out->print("[BOOTSTRAP]");
} else {
for (int frame = 0; frame < NMT_TrackingStackDepth; frame ++) {
pc = get_frame(frame);
if (pc == NULL) break; // Print indent
for (int index = 0; index < indent; index ++) out->print(" ");
if (os::dll_address_to_function_name(pc, buf, sizeof(buf), &offset)) {
out->print("[" PTR_FORMAT "] %s+0x%x", p2i(pc), buf, offset);
} else {
out->print("[" PTR_FORMAT "]", p2i(pc));
}
// Note: we deliberately omit printing source information here. NativeCallStack::print_on() // can be called thousands of times as part of NMT detail reporting, and source printing // can slow down reporting by a factor of 5 or more depending on platform (see JDK-8296931).
out->cr();
}
}
}
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