< prev index next > src/hotspot/cpu/riscv/gc/shenandoah/shenandoahBarrierSetAssembler_riscv.cpp
Print this page
#include "gc/shenandoah/mode/shenandoahMode.hpp"
#include "gc/shenandoah/shenandoahBarrierSet.hpp"
#include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
#include "gc/shenandoah/shenandoahHeap.inline.hpp"
#include "gc/shenandoah/shenandoahHeapRegion.hpp"
+ #include "gc/shenandoah/shenandoahNMethod.inline.hpp"
#include "gc/shenandoah/shenandoahRuntime.hpp"
#include "gc/shenandoah/shenandoahThreadLocalData.hpp"
#include "interpreter/interp_masm.hpp"
#include "interpreter/interpreter.hpp"
+ #include "nativeInst_riscv.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/sharedRuntime.hpp"
#ifdef COMPILER1
#include "c1/c1_LIRAssembler.hpp"
#include "c1/c1_MacroAssembler.hpp"
__ bind(L_done);
}
#undef __
+ address ShenandoahBarrierSetAssembler::parse_jump_address(address pc) {
+ NativeInstruction* ni = nativeInstruction_at(pc);
+ assert(ni->is_jump(), "Must be a jump");
+ NativeJump* jmp = nativeJump_at(pc);
+ return jmp->jump_destination();
+ }
+
+ static uint32_t encode_patchable_nop() {
+ return 0x00000013;
+ }
+
+ static uint32_t encode_patchable_jump(address pc, address target_pc) {
+ int32_t disp = checked_cast<int32_t>((intptr_t)target_pc - (intptr_t)pc);
+ return Assembler::encode_jal(x0, disp);
+ }
+
+ void ShenandoahBarrierSetAssembler::insert_patchable_nop(address pc) {
+ *((uint32_t*)pc) = encode_patchable_nop();
+ }
+
+ void ShenandoahBarrierSetAssembler::insert_patchable_jump(address pc, address target_pc) {
+ *((uint32_t*)pc) = encode_patchable_jump(pc, target_pc);
+ }
+
+ bool ShenandoahBarrierSetAssembler::is_patchable_nop(address pc) {
+ return *((uint32_t*)pc) == encode_patchable_nop();
+ }
+
+ bool ShenandoahBarrierSetAssembler::is_patchable_jump(address pc, address target_pc) {
+ return *((uint32_t*)pc) == encode_patchable_jump(pc, target_pc);
+ }
+
#ifdef COMPILER1
#define __ ce->masm()->
void ShenandoahBarrierSetAssembler::keepalive_barrier_c1_stub(LIR_Assembler* ce, ShenandoahKeepaliveBarrierStub* stub) {
} else {
__ sb(zr, Address(tmp2));
}
}
! void ShenandoahBarrierStubC2::enter_if_gc_state(MacroAssembler& masm, const char test_state, Register tmp) {
! Assembler::InlineSkippedInstructionsCounter skip_counter(&masm);
! Address gc_state_fast(xthread, in_bytes(ShenandoahThreadLocalData::gc_state_fast_array_offset(test_state)));
! __ lbu(tmp, gc_state_fast);
! __ beqz(tmp, *continuation());
! __ j(*entry());
! // This is were the slowpath stub will return to or the code above will
! // jump to if the checks are false
__ bind(*continuation());
}
void ShenandoahBarrierStubC2::emit_code(MacroAssembler& masm) {
Assembler::InlineSkippedInstructionsCounter skip_counter(&masm);
} else {
__ sb(zr, Address(tmp2));
}
}
! void ShenandoahBarrierStubC2::patchable_jump(MacroAssembler& masm, const char gc_state, bool jump_when_state, Label* L_target) {
! PhaseOutput* const output = Compile::current()->output();
+ if (output->in_scratch_emit_size()) {
+ // Avoid binding L_target in scratch emits.
+ // We know the patched check is exactly one incompressible instruction long.
+ Assembler::IncompressibleScope scope(&masm);
+ __ nop();
+ return;
+ }
! // Emit the unconditional branch in the first version of the method.
! // Let the rest of runtime figure out how to manage it.
! __ relocate(patchable_barrier_Relocation::spec(ShenandoahNMethod::encode_to_reloc(gc_state, jump_when_state)));
! __ j(*L_target);
+ }
! void ShenandoahBarrierStubC2::enter_if_gc_state(MacroAssembler& masm, const char test_state) {
! Assembler::InlineSkippedInstructionsCounter skip_counter(&masm);
+ patchable_jump_if_gc_state(masm, test_state, entry());
__ bind(*continuation());
}
void ShenandoahBarrierStubC2::emit_code(MacroAssembler& masm) {
Assembler::InlineSkippedInstructionsCounter skip_counter(&masm);
void ShenandoahBarrierStubC2::keepalive(MacroAssembler& masm, Label* L_done) {
Address index(xthread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_index_offset()));
Address buffer(xthread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_buffer_offset()));
Label L_through, L_slowpath;
! // If another barrier is enabled as well, do a runtime check for a specific barrier.
if (_needs_load_ref_barrier) {
! assert(L_done == nullptr, "L_done is always null when _needs_load_ref_barrier is true");
! Address gc_state_fast(xthread, in_bytes(ShenandoahThreadLocalData::gc_state_fast_array_offset(ShenandoahHeap::MARKING)));
! __ lbu(_tmp1, gc_state_fast);
- __ beqz(_tmp1, L_through);
}
// Fast-path: put object into buffer.
// If buffer is already full, go slow.
__ ld(_tmp1, index);
void ShenandoahBarrierStubC2::keepalive(MacroAssembler& masm, Label* L_done) {
Address index(xthread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_index_offset()));
Address buffer(xthread, in_bytes(ShenandoahThreadLocalData::satb_mark_queue_buffer_offset()));
Label L_through, L_slowpath;
! // If another barrier is enabled as well, do a check for a specific barrier.
if (_needs_load_ref_barrier) {
! assert(L_done == nullptr, "Should be");
! char state_to_check = ShenandoahHeap::MARKING;
! patchable_jump_if_not_gc_state(masm, state_to_check, &L_through);
}
// Fast-path: put object into buffer.
// If buffer is already full, go slow.
__ ld(_tmp1, index);
}
void ShenandoahBarrierStubC2::lrb(MacroAssembler& masm) {
Label L_slow;
! // If another barrier is enabled as well, do a runtime check for a specific barrier.
if (_needs_keep_alive_barrier) {
char state_to_check = ShenandoahHeap::HAS_FORWARDED | (_needs_load_ref_weak_barrier ? ShenandoahHeap::WEAK_ROOTS : 0);
! Address gc_state_fast(xthread, in_bytes(ShenandoahThreadLocalData::gc_state_fast_array_offset(state_to_check)));
- __ lbu(_tmp1, gc_state_fast);
- maybe_far_jump_if_zero(masm, _tmp1);
}
// If weak references are being processed, weak/phantom loads need to go slow,
// regardless of their cset status.
if (_needs_load_ref_weak_barrier) {
! Address gc_state_fast(xthread, in_bytes(ShenandoahThreadLocalData::gc_state_fast_array_offset(ShenandoahHeap::WEAK_ROOTS)));
! __ lbu(_tmp1, gc_state_fast);
- __ bnez(_tmp1, L_slow);
}
// Cset-check. Fall-through to slow if in collection set.
if (_narrow) {
__ decode_heap_oop_not_null(_tmp2, _obj);
}
void ShenandoahBarrierStubC2::lrb(MacroAssembler& masm) {
Label L_slow;
! // If another barrier is enabled as well, do a check for a specific barrier.
if (_needs_keep_alive_barrier) {
char state_to_check = ShenandoahHeap::HAS_FORWARDED | (_needs_load_ref_weak_barrier ? ShenandoahHeap::WEAK_ROOTS : 0);
! patchable_jump_if_not_gc_state(masm, state_to_check, continuation());
}
// If weak references are being processed, weak/phantom loads need to go slow,
// regardless of their cset status.
if (_needs_load_ref_weak_barrier) {
! char state_to_check = ShenandoahHeap::WEAK_ROOTS;
! patchable_jump_if_gc_state(masm, state_to_check, &L_slow);
}
// Cset-check. Fall-through to slow if in collection set.
if (_narrow) {
__ decode_heap_oop_not_null(_tmp2, _obj);
< prev index next >