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6985015: C1 needs to support compressed oops

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This change implements compressed oops for C1 for x64 and sparc. The changes are mostly on the codegen level, with a few exceptions when we do access things outside of the heap that are uncompressed from the IR. Compressed oops are now also enabled with tiered.

Reviewed-by: twisti, kvn, never, phh
This commit is contained in:
Igor Veresov 2010-11-30 23:23:40 -08:00
parent 8006fe8f75
commit d59d7ffc4a
30 changed files with 493 additions and 429 deletions
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20
hotspot/src/cpu/sparc/vm/c1_MacroAssembler_sparc.cpp
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@ -40,7 +40,7 @@ void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
const Register temp_reg = G3_scratch;
// Note: needs more testing of out-of-line vs. inline slow case
verify_oop(receiver);
ld_ptr(receiver, oopDesc::klass_offset_in_bytes(), temp_reg);
load_klass(receiver, temp_reg);
cmp(temp_reg, iCache);
brx(Assembler::equal, true, Assembler::pt, L);
delayed()->nop();
@ -185,9 +185,19 @@ void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register
} else {
set((intx)markOopDesc::prototype(), t1);
}
st_ptr(t1 , obj, oopDesc::mark_offset_in_bytes ());
st_ptr(klass, obj, oopDesc::klass_offset_in_bytes ());
if (len->is_valid()) st(len , obj, arrayOopDesc::length_offset_in_bytes());
st_ptr(t1, obj, oopDesc::mark_offset_in_bytes());
if (UseCompressedOops) {
// Save klass
mov(klass, t1);
encode_heap_oop_not_null(t1);
stw(t1, obj, oopDesc::klass_offset_in_bytes());
} else {
st_ptr(klass, obj, oopDesc::klass_offset_in_bytes());
}
if (len->is_valid()) st(len, obj, arrayOopDesc::length_offset_in_bytes());
else if (UseCompressedOops) {
store_klass_gap(G0, obj);
}
}
@ -235,7 +245,7 @@ void C1_MacroAssembler::initialize_object(
Register t1, // temp register
Register t2 // temp register
) {
const int hdr_size_in_bytes = instanceOopDesc::base_offset_in_bytes();
const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize;
initialize_header(obj, klass, noreg, t1, t2);