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src/hotspot/cpu/x86/c1_MacroAssembler_x86.cpp

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 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "c1/c1_MacroAssembler.hpp"
 27 #include "c1/c1_Runtime1.hpp"
 28 #include "compiler/compilerDefinitions.inline.hpp"
 29 #include "gc/shared/barrierSet.hpp"
 30 #include "gc/shared/barrierSetAssembler.hpp"
 31 #include "gc/shared/collectedHeap.hpp"
 32 #include "gc/shared/tlab_globals.hpp"
 33 #include "interpreter/interpreter.hpp"
 34 #include "oops/arrayOop.hpp"
 35 #include "oops/markWord.hpp"
 36 #include "runtime/basicLock.hpp"

 37 #include "runtime/os.hpp"
 38 #include "runtime/sharedRuntime.hpp"
 39 #include "runtime/stubRoutines.hpp"
 40 #include "utilities/checkedCast.hpp"
 41 
 42 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register tmp, Label& slow_case) {
 43   const int aligned_mask = BytesPerWord -1;
 44   const int hdr_offset = oopDesc::mark_offset_in_bytes();
 45   assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
 46   assert_different_registers(hdr, obj, disp_hdr, tmp);
 47   int null_check_offset = -1;
 48 
 49   verify_oop(obj);
 50 
 51   // save object being locked into the BasicObjectLock
 52   movptr(Address(disp_hdr, BasicObjectLock::obj_offset()), obj);
 53 
 54   null_check_offset = offset();
 55 
 56   if (DiagnoseSyncOnValueBasedClasses != 0) {

 58     movl(hdr, Address(hdr, Klass::access_flags_offset()));
 59     testl(hdr, JVM_ACC_IS_VALUE_BASED_CLASS);
 60     jcc(Assembler::notZero, slow_case);
 61   }
 62 
 63   // Load object header
 64   movptr(hdr, Address(obj, hdr_offset));
 65 
 66   if (LockingMode == LM_LIGHTWEIGHT) {
 67 #ifdef _LP64
 68     const Register thread = r15_thread;
 69 #else
 70     const Register thread = disp_hdr;
 71     get_thread(thread);
 72 #endif
 73     lightweight_lock(obj, hdr, thread, tmp, slow_case);
 74   } else  if (LockingMode == LM_LEGACY) {
 75     Label done;
 76     // and mark it as unlocked
 77     orptr(hdr, markWord::unlocked_value);




 78     // save unlocked object header into the displaced header location on the stack
 79     movptr(Address(disp_hdr, 0), hdr);
 80     // test if object header is still the same (i.e. unlocked), and if so, store the
 81     // displaced header address in the object header - if it is not the same, get the
 82     // object header instead
 83     MacroAssembler::lock(); // must be immediately before cmpxchg!
 84     cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
 85     // if the object header was the same, we're done
 86     jcc(Assembler::equal, done);
 87     // if the object header was not the same, it is now in the hdr register
 88     // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
 89     //
 90     // 1) (hdr & aligned_mask) == 0
 91     // 2) rsp <= hdr
 92     // 3) hdr <= rsp + page_size
 93     //
 94     // these 3 tests can be done by evaluating the following expression:
 95     //
 96     // (hdr - rsp) & (aligned_mask - page_size)
 97     //

148     jcc(Assembler::notEqual, slow_case);
149     // done
150   }
151   bind(done);
152   dec_held_monitor_count();
153 }
154 
155 
156 // Defines obj, preserves var_size_in_bytes
157 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
158   if (UseTLAB) {
159     tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
160   } else {
161     jmp(slow_case);
162   }
163 }
164 
165 
166 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
167   assert_different_registers(obj, klass, len);
168   movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));








169 #ifdef _LP64
170   if (UseCompressedClassPointers) { // Take care not to kill klass
171     movptr(t1, klass);
172     encode_klass_not_null(t1, rscratch1);
173     movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
174   } else
175 #endif
176   {
177     movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
178   }
179 
180   if (len->is_valid()) {
181     movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
182   }
183 #ifdef _LP64
184   else if (UseCompressedClassPointers) {
185     xorptr(t1, t1);
186     store_klass_gap(obj, t1);
187   }
188 #endif

301   verify_oop(receiver);
302   // explicit null check not needed since load from [klass_offset] causes a trap
303   // check against inline cache
304   assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
305   int start_offset = offset();
306 
307   if (UseCompressedClassPointers) {
308     load_klass(rscratch1, receiver, rscratch2);
309     cmpptr(rscratch1, iCache);
310   } else {
311     cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
312   }
313   // if icache check fails, then jump to runtime routine
314   // Note: RECEIVER must still contain the receiver!
315   jump_cc(Assembler::notEqual,
316           RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
317   const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
318   assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
319 }
320 












321 
322 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
323   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");











324   // Make sure there is enough stack space for this method's activation.
325   // Note that we do this before doing an enter(). This matches the
326   // ordering of C2's stack overflow check / rsp decrement and allows
327   // the SharedRuntime stack overflow handling to be consistent
328   // between the two compilers.

329   generate_stack_overflow_check(bang_size_in_bytes);
330 
331   push(rbp);
332   if (PreserveFramePointer) {
333     mov(rbp, rsp);
334   }
335 #if !defined(_LP64) && defined(COMPILER2)
336   if (UseSSE < 2 && !CompilerConfig::is_c1_only_no_jvmci()) {
337     // c2 leaves fpu stack dirty. Clean it on entry
338     empty_FPU_stack();
339   }
340 #endif // !_LP64 && COMPILER2
341   decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0
342 
343   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
344   // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
345   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);
346 }
347 
348 
349 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) {
350   increment(rsp, frame_size_in_bytes);  // Does not emit code for frame_size == 0
351   pop(rbp);
352 }
353 
354 
355 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
356   if (breakAtEntry || VerifyFPU) {
357     // Verified Entry first instruction should be 5 bytes long for correct
358     // patching by patch_verified_entry().
359     //
360     // Breakpoint and VerifyFPU have one byte first instruction.
361     // Also first instruction will be one byte "push(rbp)" if stack banging
362     // code is not generated (see build_frame() above).
363     // For all these cases generate long instruction first.
364     fat_nop();
365   }
366   if (breakAtEntry) int3();
367   // build frame
368   IA32_ONLY( verify_FPU(0, "method_entry"); )
369 }
370 


























































371 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
372   // rbp, + 0: link
373   //     + 1: return address
374   //     + 2: argument with offset 0
375   //     + 3: argument with offset 1
376   //     + 4: ...
377 
378   movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
379 }
380 
381 #ifndef PRODUCT
382 
383 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
384   if (!VerifyOops) return;
385   verify_oop_addr(Address(rsp, stack_offset));
386 }
387 
388 void C1_MacroAssembler::verify_not_null_oop(Register r) {
389   if (!VerifyOops) return;
390   Label not_null;

 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "c1/c1_MacroAssembler.hpp"
 27 #include "c1/c1_Runtime1.hpp"
 28 #include "compiler/compilerDefinitions.inline.hpp"
 29 #include "gc/shared/barrierSet.hpp"
 30 #include "gc/shared/barrierSetAssembler.hpp"
 31 #include "gc/shared/collectedHeap.hpp"
 32 #include "gc/shared/tlab_globals.hpp"
 33 #include "interpreter/interpreter.hpp"
 34 #include "oops/arrayOop.hpp"
 35 #include "oops/markWord.hpp"
 36 #include "runtime/basicLock.hpp"
 37 #include "runtime/frame.inline.hpp"
 38 #include "runtime/os.hpp"
 39 #include "runtime/sharedRuntime.hpp"
 40 #include "runtime/stubRoutines.hpp"
 41 #include "utilities/checkedCast.hpp"
 42 
 43 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register tmp, Label& slow_case) {
 44   const int aligned_mask = BytesPerWord -1;
 45   const int hdr_offset = oopDesc::mark_offset_in_bytes();
 46   assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
 47   assert_different_registers(hdr, obj, disp_hdr, tmp);
 48   int null_check_offset = -1;
 49 
 50   verify_oop(obj);
 51 
 52   // save object being locked into the BasicObjectLock
 53   movptr(Address(disp_hdr, BasicObjectLock::obj_offset()), obj);
 54 
 55   null_check_offset = offset();
 56 
 57   if (DiagnoseSyncOnValueBasedClasses != 0) {

 59     movl(hdr, Address(hdr, Klass::access_flags_offset()));
 60     testl(hdr, JVM_ACC_IS_VALUE_BASED_CLASS);
 61     jcc(Assembler::notZero, slow_case);
 62   }
 63 
 64   // Load object header
 65   movptr(hdr, Address(obj, hdr_offset));
 66 
 67   if (LockingMode == LM_LIGHTWEIGHT) {
 68 #ifdef _LP64
 69     const Register thread = r15_thread;
 70 #else
 71     const Register thread = disp_hdr;
 72     get_thread(thread);
 73 #endif
 74     lightweight_lock(obj, hdr, thread, tmp, slow_case);
 75   } else  if (LockingMode == LM_LEGACY) {
 76     Label done;
 77     // and mark it as unlocked
 78     orptr(hdr, markWord::unlocked_value);
 79     if (EnableValhalla) {
 80       // Mask inline_type bit such that we go to the slow path if object is an inline type
 81       andptr(hdr, ~((int) markWord::inline_type_bit_in_place));
 82     }
 83     // save unlocked object header into the displaced header location on the stack
 84     movptr(Address(disp_hdr, 0), hdr);
 85     // test if object header is still the same (i.e. unlocked), and if so, store the
 86     // displaced header address in the object header - if it is not the same, get the
 87     // object header instead
 88     MacroAssembler::lock(); // must be immediately before cmpxchg!
 89     cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
 90     // if the object header was the same, we're done
 91     jcc(Assembler::equal, done);
 92     // if the object header was not the same, it is now in the hdr register
 93     // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
 94     //
 95     // 1) (hdr & aligned_mask) == 0
 96     // 2) rsp <= hdr
 97     // 3) hdr <= rsp + page_size
 98     //
 99     // these 3 tests can be done by evaluating the following expression:
100     //
101     // (hdr - rsp) & (aligned_mask - page_size)
102     //

153     jcc(Assembler::notEqual, slow_case);
154     // done
155   }
156   bind(done);
157   dec_held_monitor_count();
158 }
159 
160 
161 // Defines obj, preserves var_size_in_bytes
162 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
163   if (UseTLAB) {
164     tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
165   } else {
166     jmp(slow_case);
167   }
168 }
169 
170 
171 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
172   assert_different_registers(obj, klass, len);
173   if (EnableValhalla) {
174     // Need to copy markWord::prototype header for klass
175     assert_different_registers(obj, klass, len, t1, t2);
176     movptr(t1, Address(klass, Klass::prototype_header_offset()));
177     movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
178   } else {
179     // This assumes that all prototype bits fit in an int32_t
180     movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
181   }
182 #ifdef _LP64
183   if (UseCompressedClassPointers) { // Take care not to kill klass
184     movptr(t1, klass);
185     encode_klass_not_null(t1, rscratch1);
186     movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
187   } else
188 #endif
189   {
190     movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
191   }
192 
193   if (len->is_valid()) {
194     movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
195   }
196 #ifdef _LP64
197   else if (UseCompressedClassPointers) {
198     xorptr(t1, t1);
199     store_klass_gap(obj, t1);
200   }
201 #endif

314   verify_oop(receiver);
315   // explicit null check not needed since load from [klass_offset] causes a trap
316   // check against inline cache
317   assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
318   int start_offset = offset();
319 
320   if (UseCompressedClassPointers) {
321     load_klass(rscratch1, receiver, rscratch2);
322     cmpptr(rscratch1, iCache);
323   } else {
324     cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
325   }
326   // if icache check fails, then jump to runtime routine
327   // Note: RECEIVER must still contain the receiver!
328   jump_cc(Assembler::notEqual,
329           RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
330   const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
331   assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
332 }
333 
334 void C1_MacroAssembler::build_frame_helper(int frame_size_in_bytes, int sp_offset_for_orig_pc, int sp_inc, bool reset_orig_pc, bool needs_stack_repair) {
335   push(rbp);
336   if (PreserveFramePointer) {
337     mov(rbp, rsp);
338   }
339 #if !defined(_LP64) && defined(COMPILER2)
340   if (UseSSE < 2 && !CompilerConfig::is_c1_only_no_jvmci()) {
341       // c2 leaves fpu stack dirty. Clean it on entry
342       empty_FPU_stack();
343     }
344 #endif // !_LP64 && COMPILER2
345   decrement(rsp, frame_size_in_bytes);
346 
347   if (needs_stack_repair) {
348     // Save stack increment (also account for fixed framesize and rbp)
349     assert((sp_inc & (StackAlignmentInBytes-1)) == 0, "stack increment not aligned");
350     int real_frame_size = sp_inc + frame_size_in_bytes + wordSize;
351     movptr(Address(rsp, frame_size_in_bytes - wordSize), real_frame_size);
352   }
353   if (reset_orig_pc) {
354     // Zero orig_pc to detect deoptimization during buffering in the entry points
355     movptr(Address(rsp, sp_offset_for_orig_pc), 0);
356   }
357 }
358 
359 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes, int sp_offset_for_orig_pc, bool needs_stack_repair, bool has_scalarized_args, Label* verified_inline_entry_label) {
360   // Make sure there is enough stack space for this method's activation.
361   // Note that we do this before doing an enter(). This matches the
362   // ordering of C2's stack overflow check / rsp decrement and allows
363   // the SharedRuntime stack overflow handling to be consistent
364   // between the two compilers.
365   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
366   generate_stack_overflow_check(bang_size_in_bytes);
367 
368   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, has_scalarized_args, needs_stack_repair);










369 
370   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
371   // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
372   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);

373 
374   if (verified_inline_entry_label != nullptr) {
375     // Jump here from the scalarized entry points that already created the frame.
376     bind(*verified_inline_entry_label);
377   }
378 }
379 

380 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
381   if (breakAtEntry || VerifyFPU) {
382     // Verified Entry first instruction should be 5 bytes long for correct
383     // patching by patch_verified_entry().
384     //
385     // Breakpoint and VerifyFPU have one byte first instruction.
386     // Also first instruction will be one byte "push(rbp)" if stack banging
387     // code is not generated (see build_frame() above).
388     // For all these cases generate long instruction first.
389     fat_nop();
390   }
391   if (breakAtEntry) int3();
392   // build frame
393   IA32_ONLY( verify_FPU(0, "method_entry"); )
394 }
395 
396 int C1_MacroAssembler::scalarized_entry(const CompiledEntrySignature* ces, int frame_size_in_bytes, int bang_size_in_bytes, int sp_offset_for_orig_pc, Label& verified_inline_entry_label, bool is_inline_ro_entry) {
397   assert(InlineTypePassFieldsAsArgs, "sanity");
398   // Make sure there is enough stack space for this method's activation.
399   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
400   generate_stack_overflow_check(bang_size_in_bytes);
401 
402   GrowableArray<SigEntry>* sig    = ces->sig();
403   GrowableArray<SigEntry>* sig_cc = is_inline_ro_entry ? ces->sig_cc_ro() : ces->sig_cc();
404   VMRegPair* regs      = ces->regs();
405   VMRegPair* regs_cc   = is_inline_ro_entry ? ces->regs_cc_ro() : ces->regs_cc();
406   int args_on_stack    = ces->args_on_stack();
407   int args_on_stack_cc = is_inline_ro_entry ? ces->args_on_stack_cc_ro() : ces->args_on_stack_cc();
408 
409   assert(sig->length() <= sig_cc->length(), "Zero-sized inline class not allowed!");
410   BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig_cc->length());
411   int args_passed = sig->length();
412   int args_passed_cc = SigEntry::fill_sig_bt(sig_cc, sig_bt);
413 
414   // Create a temp frame so we can call into the runtime. It must be properly set up to accommodate GC.
415   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, true, ces->c1_needs_stack_repair());
416 
417   // The runtime call might safepoint, make sure nmethod entry barrier is executed
418   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
419   // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
420   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);
421 
422   // FIXME -- call runtime only if we cannot in-line allocate all the incoming inline type args.
423   movptr(rbx, (intptr_t)(ces->method()));
424   if (is_inline_ro_entry) {
425     call(RuntimeAddress(Runtime1::entry_for(Runtime1::buffer_inline_args_no_receiver_id)));
426   } else {
427     call(RuntimeAddress(Runtime1::entry_for(Runtime1::buffer_inline_args_id)));
428   }
429   int rt_call_offset = offset();
430 
431   // Remove the temp frame
432   addptr(rsp, frame_size_in_bytes);
433   pop(rbp);
434 
435   // Check if we need to extend the stack for packing
436   int sp_inc = 0;
437   if (args_on_stack > args_on_stack_cc) {
438     sp_inc = extend_stack_for_inline_args(args_on_stack);
439   }
440 
441   shuffle_inline_args(true, is_inline_ro_entry, sig_cc,
442                       args_passed_cc, args_on_stack_cc, regs_cc, // from
443                       args_passed, args_on_stack, regs,          // to
444                       sp_inc, rax);
445 
446   // Create the real frame. Below jump will then skip over the stack banging and frame
447   // setup code in the verified_inline_entry (which has a different real_frame_size).
448   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, sp_inc, false, ces->c1_needs_stack_repair());
449 
450   jmp(verified_inline_entry_label);
451   return rt_call_offset;
452 }
453 
454 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
455   // rbp, + 0: link
456   //     + 1: return address
457   //     + 2: argument with offset 0
458   //     + 3: argument with offset 1
459   //     + 4: ...
460 
461   movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
462 }
463 
464 #ifndef PRODUCT
465 
466 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
467   if (!VerifyOops) return;
468   verify_oop_addr(Address(rsp, stack_offset));
469 }
470 
471 void C1_MacroAssembler::verify_not_null_oop(Register r) {
472   if (!VerifyOops) return;
473   Label not_null;
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