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6537506: Provide a mechanism for specifying Java-level USDT-like dtrace probes

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Initial checkin of JSDT code

Reviewed-by: acorn, sbohne
This commit is contained in:
Keith McGuigan 2008-04-17 22:18:15 -04:00
parent 849e0dfc44
commit f072bc9d3f
26 changed files with 2935 additions and 26 deletions
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63
hotspot/src/share/vm/runtime/sharedRuntime.cpp
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@ -1748,11 +1748,6 @@ int AdapterHandlerLibrary::get_create_adapter_index(methodHandle method) {
// _fingerprints array (it is not safe for concurrent readers and a single
// writer: this can be fixed if it becomes a problem).
// Shouldn't be here if running -Xint
if (Arguments::mode() == Arguments::_int) {
ShouldNotReachHere();
}
// Get the address of the ic_miss handlers before we grab the
// AdapterHandlerLibrary_lock. This fixes bug 6236259 which
// was caused by the initialization of the stubs happening
@ -1997,6 +1992,64 @@ nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method) {
return nm;
}
#ifdef HAVE_DTRACE_H
// Create a dtrace nmethod for this method. The wrapper converts the
// java compiled calling convention to the native convention, makes a dummy call
// (actually nops for the size of the call instruction, which become a trap if
// probe is enabled). The returns to the caller. Since this all looks like a
// leaf no thread transition is needed.
nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {
ResourceMark rm;
nmethod* nm = NULL;
if (PrintCompilation) {
ttyLocker ttyl;
tty->print("--- n%s ");
method->print_short_name(tty);
if (method->is_static()) {
tty->print(" (static)");
}
tty->cr();
}
{
// perform the work while holding the lock, but perform any printing
// outside the lock
MutexLocker mu(AdapterHandlerLibrary_lock);
// See if somebody beat us to it
nm = method->code();
if (nm) {
return nm;
}
// Improve alignment slightly
u_char* buf = (u_char*)
(((intptr_t)_buffer + CodeEntryAlignment-1) & ~(CodeEntryAlignment-1));
CodeBuffer buffer(buf, AdapterHandlerLibrary_size);
// Need a few relocation entries
double locs_buf[20];
buffer.insts()->initialize_shared_locs(
(relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
MacroAssembler _masm(&buffer);
// Generate the compiled-to-native wrapper code
nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);
}
return nm;
}
// the dtrace method needs to convert java lang string to utf8 string.
void SharedRuntime::get_utf(oopDesc* src, address dst) {
typeArrayOop jlsValue = java_lang_String::value(src);
int jlsOffset = java_lang_String::offset(src);
int jlsLen = java_lang_String::length(src);
jchar* jlsPos = (jlsLen == 0) ? NULL :
jlsValue->char_at_addr(jlsOffset);
(void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);
}
#endif // ndef HAVE_DTRACE_H
// -------------------------------------------------------------------------
// Java-Java calling convention
// (what you use when Java calls Java)