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8329433: Reduce nmethod header size #18768

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8329433: Reduce nmethod header size #18768

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a0c46b8
8329433: Reduce nmethod header size
vnkozlov Apr 12, 2024
488f1b9
Moved some fields initialization into init_defaults()
vnkozlov Apr 15, 2024
13744e7
Union fields which usages do not overlap
vnkozlov Apr 15, 2024
6cb22e8
Use 16-bits types for header_size and frame_complete_offset arguments
vnkozlov Apr 16, 2024
8405a23
Address comments. Used checked_cast.
vnkozlov Apr 16, 2024
71ade0f
Shuffle fields initialization
vnkozlov Apr 17, 2024
6a164b1
remove trailing space
vnkozlov Apr 17, 2024
adc1759
Merge master
vnkozlov Apr 17, 2024
5f5f30d
Address comment
vnkozlov Apr 17, 2024
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35 changes: 14 additions & 21 deletions src/hotspot/share/code/nmethod.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -999,23 +999,27 @@ const char* nmethod::compiler_name() const {
// Fill in default values for various flag fields
void nmethod::init_defaults() {
// avoid uninitialized fields, even for short time periods
_osr_link = nullptr;
_exception_cache = nullptr;
_gc_data = nullptr;
_oops_do_mark_link = nullptr;
_compiled_ic_data = nullptr;

#if INCLUDE_RTM_OPT
_rtm_state = NoRTM;
#endif
_is_unloading_state = 0;
_state = not_installed;

_has_unsafe_access = 0;
_has_method_handle_invokes = 0;
_has_wide_vectors = 0;
_has_monitors = 0;

_state = not_installed;
_has_flushed_dependencies = 0;
_is_unlinked = 0;
_load_reported = 0; // jvmti state

_oops_do_mark_link = nullptr;
_osr_link = nullptr;
#if INCLUDE_RTM_OPT
_rtm_state = NoRTM;
#endif
_deoptimization_status = not_marked;
}

#ifdef ASSERT
Expand Down Expand Up @@ -1208,12 +1212,8 @@ nmethod::nmethod(
offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
_deoptimization_generation(0),
_method(method),
_gc_data(nullptr),
_compiled_ic_data(nullptr),
_native_receiver_sp_offset(basic_lock_owner_sp_offset),
_native_basic_lock_sp_offset(basic_lock_sp_offset),
_is_unloading_state(0),
_deoptimization_status(not_marked)
_native_basic_lock_sp_offset(basic_lock_sp_offset)
{
{
debug_only(NoSafepointVerifier nsv;)
Expand Down Expand Up @@ -1268,7 +1268,6 @@ nmethod::nmethod(
_entry_offset = (uint16_t)offsets->value(CodeOffsets::Entry);
_verified_entry_offset = (uint16_t)offsets->value(CodeOffsets::Verified_Entry);
_osr_entry_point = nullptr;
_exception_cache = nullptr;
_pc_desc_container.reset_to(nullptr);

if (offsets->value(CodeOffsets::Exceptions) != -1) {
Expand Down Expand Up @@ -1369,12 +1368,8 @@ nmethod::nmethod(
offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
_deoptimization_generation(0),
_method(method),
_gc_data(nullptr),
_compiled_ic_data(nullptr),
_native_receiver_sp_offset(in_ByteSize(-1)),
_native_basic_lock_sp_offset(in_ByteSize(-1)),
_is_unloading_state(0),
_deoptimization_status(not_marked)
_native_basic_lock_sp_offset(in_ByteSize(-1))
{
assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
{
Expand Down Expand Up @@ -1466,15 +1461,14 @@ nmethod::nmethod(
_entry_offset = (uint16_t)offsets->value(CodeOffsets::Entry);
_verified_entry_offset = (uint16_t)offsets->value(CodeOffsets::Verified_Entry);
_osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
_exception_cache = nullptr;

_pc_desc_container.reset_to(scopes_pcs_begin());

code_buffer->copy_code_and_locs_to(this);
// Copy contents of ScopeDescRecorder to nmethod
code_buffer->copy_values_to(this);
debug_info->copy_to(this);
//dependencies->copy_to(this);
dependencies->copy_to(this);
clear_unloading_state();

#if INCLUDE_JVMCI
Expand All @@ -1483,7 +1477,6 @@ nmethod::nmethod(
jvmci_nmethod_data()->copy(jvmci_data);
}
#endif
dependencies->copy_to(this);

finalize_relocations();

Expand Down