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8141132: JEP 254: Compact Strings

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Adopt a more space-efficient internal representation for strings.

Co-authored-by: Brent Christian <brent.christian@oracle.com>
Co-authored-by: Vivek Deshpande <vivek.r.deshpande@intel.com>
Co-authored-by: Charlie Hunt <charlie.hunt@oracle.com>
Co-authored-by: Vladimir Kozlov <vladimir.kozlov@oracle.com>
Co-authored-by: Roger Riggs <roger.riggs@oracle.com>
Co-authored-by: Xueming Shen <xueming.shen@oracle.com>
Co-authored-by: Aleksey Shipilev <aleksey.shipilev@oracle.com>
Co-authored-by: Sandhya Viswanathan <sandhya.viswanathan@intel.com>
Reviewed-by: alanb, bdelsart, coleenp, iklam, jiangli, jrose, kevinw, naoto, pliden, roland, smarks, twisti
This commit is contained in:
Tobias Hartmann 2015-11-03 09:41:03 +01:00
parent 4e24e2cc6c
commit 7af927f9c1
74 changed files with 4838 additions and 1683 deletions
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26
hotspot/src/share/vm/c1/c1_GraphBuilder.cpp
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@ -3445,6 +3445,8 @@ void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee) {
case vmIntrinsics::_getAndSetInt :
case vmIntrinsics::_getAndSetLong :
case vmIntrinsics::_getAndSetObject : append_unsafe_get_and_set_obj(callee, false); return;
case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return;
case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return;
default:
break;
}
@ -4179,6 +4181,30 @@ void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
compilation()->set_has_unsafe_access(true);
}
void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) {
// This intrinsic accesses byte[] array as char[] array. Computing the offsets
// correctly requires matched array shapes.
assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE),
"sanity: byte[] and char[] bases agree");
assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2,
"sanity: byte[] and char[] scales agree");
ValueStack* state_before = copy_state_indexed_access();
compilation()->set_has_access_indexed(true);
Values* args = state()->pop_arguments(callee->arg_size());
Value array = args->at(0);
Value index = args->at(1);
if (is_store) {
Value value = args->at(2);
Instruction* store = append(new StoreIndexed(array, index, NULL, T_CHAR, value, state_before));
store->set_flag(Instruction::NeedsRangeCheckFlag, false);
_memory->store_value(value);
} else {
Instruction* load = append(new LoadIndexed(array, index, NULL, T_CHAR, state_before));
load->set_flag(Instruction::NeedsRangeCheckFlag, false);
push(load->type(), load);
}
}
void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) {
CompileLog* log = compilation()->log();