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/*
* Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2021 SAP SE. 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "c1/c1_CodeStubs.hpp"
#include "c1/c1_FrameMap.hpp"
#include "c1/c1_LIRAssembler.hpp"
#include "c1/c1_MacroAssembler.hpp"
#include "c1/c1_Runtime1.hpp"
#include "classfile/javaClasses.hpp"
#include "nativeInst_ppc.hpp"
#include "runtime/sharedRuntime.hpp"
#include "utilities/macros.hpp"
#include "vmreg_ppc.inline.hpp"
#define __ ce->masm()->
void C1SafepointPollStub::emit_code(LIR_Assembler* ce) {
if (UseSIGTRAP) {
DEBUG_ONLY( __ should_not_reach_here("C1SafepointPollStub::emit_code"); )
} else {
assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
"polling page return stub not created yet");
address stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
__ bind(_entry);
// Using pc relative address computation.
{
Label next_pc;
__ bl(next_pc);
__ bind(next_pc);
}
int current_offset = __ offset();
__ mflr(R12);
__ add_const_optimized(R12, R12, safepoint_offset() - current_offset);
__ std(R12, in_bytes(JavaThread::saved_exception_pc_offset()), R16_thread);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
__ mtctr(R0);
__ bctr();
}
}
RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array)
: _index(index), _array(array), _throw_index_out_of_bounds_exception(false) {
assert(info != NULL, "must have info");
_info = new CodeEmitInfo(info);
}
RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index)
: _index(index), _array(), _throw_index_out_of_bounds_exception(true) {
assert(info != NULL, "must have info");
_info = new CodeEmitInfo(info);
}
void RangeCheckStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
if (_info->deoptimize_on_exception()) {
address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
//__ load_const_optimized(R0, a);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
debug_only(__ illtrap());
return;
}
address stub = _throw_index_out_of_bounds_exception ? Runtime1::entry_for(Runtime1::throw_index_exception_id)
: Runtime1::entry_for(Runtime1::throw_range_check_failed_id);
//__ load_const_optimized(R0, stub);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
__ mtctr(R0);
Register index = R0;
if (_index->is_register()) {
__ extsw(index, _index->as_register());
} else {
__ load_const_optimized(index, _index->as_jint());
}
if (_array) {
__ std(_array->as_pointer_register(), -8, R1_SP);
}
__ std(index, -16, R1_SP);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
debug_only(__ illtrap());
}
PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
_info = new CodeEmitInfo(info);
}
void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
//__ load_const_optimized(R0, a);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
debug_only(__ illtrap());
}
void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
// Parameter 1: bci
__ load_const_optimized(R0, _bci);
__ std(R0, -16, R1_SP);
// Parameter 2: Method*
Metadata *m = _method->as_constant_ptr()->as_metadata();
AddressLiteral md = __ constant_metadata_address(m); // Notify OOP recorder (don't need the relocation).
__ load_const_optimized(R0, md.value());
__ std(R0, -8, R1_SP);
address a = Runtime1::entry_for(Runtime1::counter_overflow_id);
//__ load_const_optimized(R0, a);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
__ b(_continuation);
}
void DivByZeroStub::emit_code(LIR_Assembler* ce) {
if (_offset != -1) {
ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
}
__ bind(_entry);
address stub = Runtime1::entry_for(Runtime1::throw_div0_exception_id);
//__ load_const_optimized(R0, stub);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
debug_only(__ illtrap());
}
void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
address a;
if (_info->deoptimize_on_exception()) {
// Deoptimize, do not throw the exception, because it is probably wrong to do it here.
a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
} else {
a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
}
if (ImplicitNullChecks || TrapBasedNullChecks) {
ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
}
__ bind(_entry);
//__ load_const_optimized(R0, a);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
debug_only(__ illtrap());
}
// Implementation of SimpleExceptionStub
void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
address stub = Runtime1::entry_for(_stub);
//__ load_const_optimized(R0, stub);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
if (_obj->is_valid()) { __ mr_if_needed(/*tmp1 in do_CheckCast*/ R4_ARG2, _obj->as_register()); }
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
debug_only( __ illtrap(); )
}
// Implementation of NewInstanceStub
NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
_result = result;
_klass = klass;
_klass_reg = klass_reg;
_info = new CodeEmitInfo(info);
assert(stub_id == Runtime1::new_instance_id ||
stub_id == Runtime1::fast_new_instance_id ||
stub_id == Runtime1::fast_new_instance_init_check_id,
"need new_instance id");
_stub_id = stub_id;
}
void NewInstanceStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
address entry = Runtime1::entry_for(_stub_id);
//__ load_const_optimized(R0, entry);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
__ b(_continuation);
}
// Implementation of NewTypeArrayStub
NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
_klass_reg = klass_reg;
_length = length;
_result = result;
_info = new CodeEmitInfo(info);
}
void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
address entry = Runtime1::entry_for(Runtime1::new_type_array_id);
//__ load_const_optimized(R0, entry);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
__ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
__ b(_continuation);
}
// Implementation of NewObjectArrayStub
NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
_klass_reg = klass_reg;
_length = length;
_result = result;
_info = new CodeEmitInfo(info);
}
void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
address entry = Runtime1::entry_for(Runtime1::new_object_array_id);
//__ load_const_optimized(R0, entry);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
__ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
__ b(_continuation);
}
// Implementation of MonitorAccessStubs
MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
: MonitorAccessStub(obj_reg, lock_reg) {
_info = new CodeEmitInfo(info);
}
void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorenter_id : Runtime1::monitorenter_nofpu_id);
//__ load_const_optimized(R0, stub);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
__ mr_if_needed(/*scratch_opr()->as_register()*/ R4_ARG2, _obj_reg->as_register());
assert(_lock_reg->as_register() == R5_ARG3, "");
__ mtctr(R0);
__ bctrl();
ce->add_call_info_here(_info);
ce->verify_oop_map(_info);
__ b(_continuation);
}
void MonitorExitStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
if (_compute_lock) {
ce->monitor_address(_monitor_ix, _lock_reg);
}
address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorexit_id : Runtime1::monitorexit_nofpu_id);
//__ load_const_optimized(R0, stub);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
assert(_lock_reg->as_register() == R4_ARG2, "");
__ mtctr(R0);
__ bctrl();
__ b(_continuation);
}
// Implementation of patching:
// - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes).
// - Replace original code with a call to the stub.
// At Runtime:
// - call to stub, jump to runtime
// - in runtime: preserve all registers (especially objects, i.e., source and destination object)
// - in runtime: after initializing class, restore original code, reexecute instruction
int PatchingStub::_patch_info_offset = -(5 * BytesPerInstWord);
void PatchingStub::align_patch_site(MacroAssembler* ) {
// Patch sites on ppc are always properly aligned.
}
#ifdef ASSERT
inline void compare_with_patch_site(address template_start, address pc_start, int bytes_to_copy) {
address start = template_start;
for (int i = 0; i < bytes_to_copy; i++) {
address ptr = (address)(pc_start + i);
int a_byte = (*ptr) & 0xFF;
assert(a_byte == *start++, "should be the same code");
}
}
#endif
void PatchingStub::emit_code(LIR_Assembler* ce) {
// copy original code here
assert(NativeGeneralJump::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF,
"not enough room for call, need %d", _bytes_to_copy);
assert((_bytes_to_copy & 0x3) == 0, "must copy a multiple of four bytes");
Label call_patch;
int being_initialized_entry = __ offset();
if (_id == load_klass_id) {
// Produce a copy of the load klass instruction for use by the being initialized case.
AddressLiteral addrlit((address)NULL, metadata_Relocation::spec(_index));
__ load_const(_obj, addrlit, R0);
DEBUG_ONLY( compare_with_patch_site(__ code_section()->start() + being_initialized_entry, _pc_start, _bytes_to_copy); )
} else if (_id == load_mirror_id || _id == load_appendix_id) {
// Produce a copy of the load mirror instruction for use by the being initialized case.
AddressLiteral addrlit((address)NULL, oop_Relocation::spec(_index));
__ load_const(_obj, addrlit, R0);
DEBUG_ONLY( compare_with_patch_site(__ code_section()->start() + being_initialized_entry, _pc_start, _bytes_to_copy); )
} else {
// Make a copy of the code which is going to be patched.
for (int i = 0; i < _bytes_to_copy; i++) {
address ptr = (address)(_pc_start + i);
int a_byte = (*ptr) & 0xFF;
__ emit_int8 (a_byte);
}
}
address end_of_patch = __ pc();
int bytes_to_skip = 0;
if (_id == load_mirror_id) {
int offset = __ offset();
__ block_comment(" being_initialized check");
// Static field accesses have special semantics while the class
// initializer is being run so we emit a test which can be used to
// check that this code is being executed by the initializing
// thread.
assert(_obj != noreg, "must be a valid register");
assert(_index >= 0, "must have oop index");
__ mr(R0, _obj); // spill
__ ld(_obj, java_lang_Class::klass_offset(), _obj);
__ ld(_obj, in_bytes(InstanceKlass::init_thread_offset()), _obj);
__ cmpd(CCR0, _obj, R16_thread);
__ mr(_obj, R0); // restore
__ bne(CCR0, call_patch);
// Load_klass patches may execute the patched code before it's
// copied back into place so we need to jump back into the main
// code of the nmethod to continue execution.
__ b(_patch_site_continuation);
// Make sure this extra code gets skipped.
bytes_to_skip += __ offset() - offset;
}
// Now emit the patch record telling the runtime how to find the
// pieces of the patch. We only need 3 bytes but it has to be
// aligned as an instruction so emit 4 bytes.
int sizeof_patch_record = 4;
bytes_to_skip += sizeof_patch_record;
// Emit the offsets needed to find the code to patch.
int being_initialized_entry_offset = __ offset() - being_initialized_entry + sizeof_patch_record;
// Emit the patch record. We need to emit a full word, so emit an extra empty byte.
__ emit_int8(0);
__ emit_int8(being_initialized_entry_offset);
__ emit_int8(bytes_to_skip);
__ emit_int8(_bytes_to_copy);
address patch_info_pc = __ pc();
assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
address entry = __ pc();
NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
address target = NULL;
relocInfo::relocType reloc_type = relocInfo::none;
switch (_id) {
case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id);
reloc_type = relocInfo::metadata_type; break;
case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id);
reloc_type = relocInfo::oop_type; break;
case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id);
reloc_type = relocInfo::oop_type; break;
default: ShouldNotReachHere();
}
__ bind(call_patch);
__ block_comment("patch entry point");
//__ load_const(R0, target); + mtctr + bctrl must have size -_patch_info_offset
__ load_const32(R0, MacroAssembler::offset_to_global_toc(target));
__ add(R0, R29_TOC, R0);
__ mtctr(R0);
__ bctrl();
assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
ce->add_call_info_here(_info);
__ b(_patch_site_entry);
if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
CodeSection* cs = __ code_section();
address pc = (address)_pc_start;
RelocIterator iter(cs, pc, pc + 1);
relocInfo::change_reloc_info_for_address(&iter, (address) pc, reloc_type, relocInfo::none);
}
}
void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
address stub = Runtime1::entry_for(Runtime1::deoptimize_id);
//__ load_const_optimized(R0, stub);
__ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
__ mtctr(R0);
__ load_const_optimized(R0, _trap_request); // Pass trap request in R0.
__ bctrl();
ce->add_call_info_here(_info);
debug_only(__ illtrap());
}
void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
//---------------slow case: call to native-----------------
__ bind(_entry);
__ mr(R3_ARG1, src()->as_register());
__ extsw(R4_ARG2, src_pos()->as_register());
__ mr(R5_ARG3, dst()->as_register());
__ extsw(R6_ARG4, dst_pos()->as_register());
__ extsw(R7_ARG5, length()->as_register());
ce->emit_static_call_stub();
bool success = ce->emit_trampoline_stub_for_call(SharedRuntime::get_resolve_static_call_stub());
if (!success) { return; }
__ relocate(relocInfo::static_call_type);
// Note: At this point we do not have the address of the trampoline
// stub, and the entry point might be too far away for bl, so __ pc()
// serves as dummy and the bl will be patched later.
__ code()->set_insts_mark();
__ bl(__ pc());
ce->add_call_info_here(info());
ce->verify_oop_map(info());
#ifndef PRODUCT
if (PrintC1Statistics) {
const address counter = (address)&Runtime1::_arraycopy_slowcase_cnt;
const Register tmp = R3, tmp2 = R4;
int simm16_offs = __ load_const_optimized(tmp, counter, tmp2, true);
__ lwz(tmp2, simm16_offs, tmp);
__ addi(tmp2, tmp2, 1);
__ stw(tmp2, simm16_offs, tmp);
}
#endif
__ b(_continuation);
}
#undef __
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