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6706829: Compressed Oops: add debug info for narrow oops

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Add support for narrow oops in debug info to avoid decoding.

Reviewed-by: rasbold, never
This commit is contained in:
Vladimir Kozlov 2008-09-10 18:23:32 -07:00
parent 63c98ed888
commit 659ca734bb
11 changed files with 169 additions and 48 deletions
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18
hotspot/src/share/vm/runtime/stackValue.cpp
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@ -1,5 +1,5 @@
/*
* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -86,6 +86,22 @@ StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* r
case Location::lng:
// Long value in an aligned adjacent pair
return new StackValue(*(intptr_t*)value_addr);
case Location::narrowoop: {
union { intptr_t p; narrowOop noop;} value;
value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
if (loc.is_register()) {
// The callee has no clue whether the register holds an int,
// long or is unused. He always saves a long. Here we know
// a long was saved, but we only want an int back. Narrow the
// saved long to the int that the JVM wants.
value.noop = (narrowOop) *(julong*) value_addr;
} else {
value.noop = *(narrowOop*) value_addr;
}
// Decode narrowoop and wrap a handle around the oop
Handle h(oopDesc::decode_heap_oop(value.noop));
return new StackValue(h);
}
#endif
case Location::oop: {
Handle h(*(oop *)value_addr); // Wrap a handle around the oop