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 "code/compiledIC.hpp"
29 #include "compiler/compilerDefinitions.inline.hpp"
30 #include "gc/shared/barrierSet.hpp"
31 #include "gc/shared/barrierSetAssembler.hpp"
32 #include "gc/shared/collectedHeap.hpp"
33 #include "gc/shared/tlab_globals.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/markWord.hpp"
37 #include "runtime/basicLock.hpp"
38 #include "runtime/globals.hpp"
39 #include "runtime/os.hpp"
40 #include "runtime/sharedRuntime.hpp"
41 #include "runtime/stubRoutines.hpp"
42 #include "utilities/checkedCast.hpp"
43 #include "utilities/globalDefinitions.hpp"
44
45 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register tmp, Label& slow_case) {
46 const int aligned_mask = BytesPerWord -1;
47 const int hdr_offset = oopDesc::mark_offset_in_bytes();
48 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
49 assert_different_registers(hdr, obj, disp_hdr, tmp);
50 int null_check_offset = -1;
51
52 verify_oop(obj);
53
54 // save object being locked into the BasicObjectLock
55 movptr(Address(disp_hdr, BasicObjectLock::obj_offset()), obj);
56
57 null_check_offset = offset();
60 load_klass(hdr, obj, rscratch1);
61 movl(hdr, Address(hdr, Klass::access_flags_offset()));
62 testl(hdr, JVM_ACC_IS_VALUE_BASED_CLASS);
63 jcc(Assembler::notZero, slow_case);
64 }
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 // Load object header
77 movptr(hdr, Address(obj, hdr_offset));
78 // and mark it as unlocked
79 orptr(hdr, markWord::unlocked_value);
80 // save unlocked object header into the displaced header location on the stack
81 movptr(Address(disp_hdr, 0), hdr);
82 // test if object header is still the same (i.e. unlocked), and if so, store the
83 // displaced header address in the object header - if it is not the same, get the
84 // object header instead
85 MacroAssembler::lock(); // must be immediately before cmpxchg!
86 cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
87 // if the object header was the same, we're done
88 jcc(Assembler::equal, done);
89 // if the object header was not the same, it is now in the hdr register
90 // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
91 //
92 // 1) (hdr & aligned_mask) == 0
93 // 2) rsp <= hdr
94 // 3) hdr <= rsp + page_size
95 //
96 // these 3 tests can be done by evaluating the following expression:
97 //
98 // (hdr - rsp) & (aligned_mask - page_size)
99 //
155 jcc(Assembler::notEqual, slow_case);
156 // done
157 }
158 bind(done);
159 dec_held_monitor_count();
160 }
161
162
163 // Defines obj, preserves var_size_in_bytes
164 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
165 if (UseTLAB) {
166 tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
167 } else {
168 jmp(slow_case);
169 }
170 }
171
172
173 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
174 assert_different_registers(obj, klass, len);
175 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
176 #ifdef _LP64
177 if (UseCompressedClassPointers) { // Take care not to kill klass
178 movptr(t1, klass);
179 encode_klass_not_null(t1, rscratch1);
180 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
181 } else
182 #endif
183 {
184 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
185 }
186
187 if (len->is_valid()) {
188 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
189 #ifdef _LP64
190 int base_offset = arrayOopDesc::length_offset_in_bytes() + BytesPerInt;
191 if (!is_aligned(base_offset, BytesPerWord)) {
192 assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
193 // Clear gap/first 4 bytes following the length field.
194 xorl(t1, t1);
195 movl(Address(obj, base_offset), t1);
299
300 initialize_header(obj, klass, len, t1, t2);
301
302 // clear rest of allocated space
303 if (zero_array) {
304 const Register len_zero = len;
305 // Align-up to word boundary, because we clear the 4 bytes potentially
306 // following the length field in initialize_header().
307 int base_offset = align_up(base_offset_in_bytes, BytesPerWord);
308 initialize_body(obj, arr_size, base_offset, len_zero);
309 }
310
311 if (CURRENT_ENV->dtrace_alloc_probes()) {
312 assert(obj == rax, "must be");
313 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
314 }
315
316 verify_oop(obj);
317 }
318
319 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
320 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
321 // Make sure there is enough stack space for this method's activation.
322 // Note that we do this before doing an enter(). This matches the
323 // ordering of C2's stack overflow check / rsp decrement and allows
324 // the SharedRuntime stack overflow handling to be consistent
325 // between the two compilers.
326 generate_stack_overflow_check(bang_size_in_bytes);
327
328 push(rbp);
329 if (PreserveFramePointer) {
330 mov(rbp, rsp);
331 }
332 #if !defined(_LP64) && defined(COMPILER2)
333 if (UseSSE < 2 && !CompilerConfig::is_c1_only_no_jvmci()) {
334 // c2 leaves fpu stack dirty. Clean it on entry
335 empty_FPU_stack();
336 }
337 #endif // !_LP64 && COMPILER2
338 decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0
339
340 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
341 // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
342 bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);
343 }
344
345
346 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) {
347 increment(rsp, frame_size_in_bytes); // Does not emit code for frame_size == 0
348 pop(rbp);
349 }
350
351
352 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
353 if (breakAtEntry || VerifyFPU) {
354 // Verified Entry first instruction should be 5 bytes long for correct
355 // patching by patch_verified_entry().
356 //
357 // Breakpoint and VerifyFPU have one byte first instruction.
358 // Also first instruction will be one byte "push(rbp)" if stack banging
359 // code is not generated (see build_frame() above).
360 // For all these cases generate long instruction first.
361 fat_nop();
362 }
363 if (breakAtEntry) int3();
364 // build frame
365 IA32_ONLY( verify_FPU(0, "method_entry"); )
366 }
367
368 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
369 // rbp, + 0: link
370 // + 1: return address
371 // + 2: argument with offset 0
372 // + 3: argument with offset 1
373 // + 4: ...
374
375 movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
376 }
377
378 #ifndef PRODUCT
379
380 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
381 if (!VerifyOops) return;
382 verify_oop_addr(Address(rsp, stack_offset));
383 }
384
385 void C1_MacroAssembler::verify_not_null_oop(Register r) {
386 if (!VerifyOops) return;
387 Label not_null;
|
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 "code/compiledIC.hpp"
29 #include "compiler/compilerDefinitions.inline.hpp"
30 #include "gc/shared/barrierSet.hpp"
31 #include "gc/shared/barrierSetAssembler.hpp"
32 #include "gc/shared/collectedHeap.hpp"
33 #include "gc/shared/tlab_globals.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/markWord.hpp"
37 #include "runtime/basicLock.hpp"
38 #include "runtime/frame.inline.hpp"
39 #include "runtime/globals.hpp"
40 #include "runtime/os.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/stubRoutines.hpp"
43 #include "utilities/checkedCast.hpp"
44 #include "utilities/globalDefinitions.hpp"
45
46 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register tmp, Label& slow_case) {
47 const int aligned_mask = BytesPerWord -1;
48 const int hdr_offset = oopDesc::mark_offset_in_bytes();
49 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
50 assert_different_registers(hdr, obj, disp_hdr, tmp);
51 int null_check_offset = -1;
52
53 verify_oop(obj);
54
55 // save object being locked into the BasicObjectLock
56 movptr(Address(disp_hdr, BasicObjectLock::obj_offset()), obj);
57
58 null_check_offset = offset();
61 load_klass(hdr, obj, rscratch1);
62 movl(hdr, Address(hdr, Klass::access_flags_offset()));
63 testl(hdr, JVM_ACC_IS_VALUE_BASED_CLASS);
64 jcc(Assembler::notZero, slow_case);
65 }
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 // Load object header
78 movptr(hdr, Address(obj, hdr_offset));
79 // and mark it as unlocked
80 orptr(hdr, markWord::unlocked_value);
81 if (EnableValhalla) {
82 // Mask inline_type bit such that we go to the slow path if object is an inline type
83 andptr(hdr, ~((int) markWord::inline_type_bit_in_place));
84 }
85 // save unlocked object header into the displaced header location on the stack
86 movptr(Address(disp_hdr, 0), hdr);
87 // test if object header is still the same (i.e. unlocked), and if so, store the
88 // displaced header address in the object header - if it is not the same, get the
89 // object header instead
90 MacroAssembler::lock(); // must be immediately before cmpxchg!
91 cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
92 // if the object header was the same, we're done
93 jcc(Assembler::equal, done);
94 // if the object header was not the same, it is now in the hdr register
95 // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
96 //
97 // 1) (hdr & aligned_mask) == 0
98 // 2) rsp <= hdr
99 // 3) hdr <= rsp + page_size
100 //
101 // these 3 tests can be done by evaluating the following expression:
102 //
103 // (hdr - rsp) & (aligned_mask - page_size)
104 //
160 jcc(Assembler::notEqual, slow_case);
161 // done
162 }
163 bind(done);
164 dec_held_monitor_count();
165 }
166
167
168 // Defines obj, preserves var_size_in_bytes
169 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
170 if (UseTLAB) {
171 tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
172 } else {
173 jmp(slow_case);
174 }
175 }
176
177
178 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
179 assert_different_registers(obj, klass, len);
180 if (EnableValhalla) {
181 // Need to copy markWord::prototype header for klass
182 assert_different_registers(obj, klass, len, t1, t2);
183 movptr(t1, Address(klass, Klass::prototype_header_offset()));
184 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
185 } else {
186 // This assumes that all prototype bits fit in an int32_t
187 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
188 }
189 #ifdef _LP64
190 if (UseCompressedClassPointers) { // Take care not to kill klass
191 movptr(t1, klass);
192 encode_klass_not_null(t1, rscratch1);
193 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
194 } else
195 #endif
196 {
197 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
198 }
199
200 if (len->is_valid()) {
201 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
202 #ifdef _LP64
203 int base_offset = arrayOopDesc::length_offset_in_bytes() + BytesPerInt;
204 if (!is_aligned(base_offset, BytesPerWord)) {
205 assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
206 // Clear gap/first 4 bytes following the length field.
207 xorl(t1, t1);
208 movl(Address(obj, base_offset), t1);
312
313 initialize_header(obj, klass, len, t1, t2);
314
315 // clear rest of allocated space
316 if (zero_array) {
317 const Register len_zero = len;
318 // Align-up to word boundary, because we clear the 4 bytes potentially
319 // following the length field in initialize_header().
320 int base_offset = align_up(base_offset_in_bytes, BytesPerWord);
321 initialize_body(obj, arr_size, base_offset, len_zero);
322 }
323
324 if (CURRENT_ENV->dtrace_alloc_probes()) {
325 assert(obj == rax, "must be");
326 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
327 }
328
329 verify_oop(obj);
330 }
331
332 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) {
333 push(rbp);
334 if (PreserveFramePointer) {
335 mov(rbp, rsp);
336 }
337 #if !defined(_LP64) && defined(COMPILER2)
338 if (UseSSE < 2 && !CompilerConfig::is_c1_only_no_jvmci()) {
339 // c2 leaves fpu stack dirty. Clean it on entry
340 empty_FPU_stack();
341 }
342 #endif // !_LP64 && COMPILER2
343 decrement(rsp, frame_size_in_bytes);
344
345 if (needs_stack_repair) {
346 // Save stack increment (also account for fixed framesize and rbp)
347 assert((sp_inc & (StackAlignmentInBytes-1)) == 0, "stack increment not aligned");
348 int real_frame_size = sp_inc + frame_size_in_bytes + wordSize;
349 movptr(Address(rsp, frame_size_in_bytes - wordSize), real_frame_size);
350 }
351 if (reset_orig_pc) {
352 // Zero orig_pc to detect deoptimization during buffering in the entry points
353 movptr(Address(rsp, sp_offset_for_orig_pc), 0);
354 }
355 }
356
357 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) {
358 // Make sure there is enough stack space for this method's activation.
359 // Note that we do this before doing an enter(). This matches the
360 // ordering of C2's stack overflow check / rsp decrement and allows
361 // the SharedRuntime stack overflow handling to be consistent
362 // between the two compilers.
363 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
364 generate_stack_overflow_check(bang_size_in_bytes);
365
366 build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, has_scalarized_args, needs_stack_repair);
367
368 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
369 // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
370 bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);
371
372 if (verified_inline_entry_label != nullptr) {
373 // Jump here from the scalarized entry points that already created the frame.
374 bind(*verified_inline_entry_label);
375 }
376 }
377
378 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
379 if (breakAtEntry || VerifyFPU) {
380 // Verified Entry first instruction should be 5 bytes long for correct
381 // patching by patch_verified_entry().
382 //
383 // Breakpoint and VerifyFPU have one byte first instruction.
384 // Also first instruction will be one byte "push(rbp)" if stack banging
385 // code is not generated (see build_frame() above).
386 // For all these cases generate long instruction first.
387 fat_nop();
388 }
389 if (breakAtEntry) int3();
390 // build frame
391 IA32_ONLY( verify_FPU(0, "method_entry"); )
392 }
393
394 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) {
395 assert(InlineTypePassFieldsAsArgs, "sanity");
396 // Make sure there is enough stack space for this method's activation.
397 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
398 generate_stack_overflow_check(bang_size_in_bytes);
399
400 GrowableArray<SigEntry>* sig = ces->sig();
401 GrowableArray<SigEntry>* sig_cc = is_inline_ro_entry ? ces->sig_cc_ro() : ces->sig_cc();
402 VMRegPair* regs = ces->regs();
403 VMRegPair* regs_cc = is_inline_ro_entry ? ces->regs_cc_ro() : ces->regs_cc();
404 int args_on_stack = ces->args_on_stack();
405 int args_on_stack_cc = is_inline_ro_entry ? ces->args_on_stack_cc_ro() : ces->args_on_stack_cc();
406
407 assert(sig->length() <= sig_cc->length(), "Zero-sized inline class not allowed!");
408 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig_cc->length());
409 int args_passed = sig->length();
410 int args_passed_cc = SigEntry::fill_sig_bt(sig_cc, sig_bt);
411
412 // Create a temp frame so we can call into the runtime. It must be properly set up to accommodate GC.
413 build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, true, ces->c1_needs_stack_repair());
414
415 // The runtime call might safepoint, make sure nmethod entry barrier is executed
416 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
417 // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
418 bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);
419
420 // FIXME -- call runtime only if we cannot in-line allocate all the incoming inline type args.
421 movptr(rbx, (intptr_t)(ces->method()));
422 if (is_inline_ro_entry) {
423 call(RuntimeAddress(Runtime1::entry_for(Runtime1::buffer_inline_args_no_receiver_id)));
424 } else {
425 call(RuntimeAddress(Runtime1::entry_for(Runtime1::buffer_inline_args_id)));
426 }
427 int rt_call_offset = offset();
428
429 // Remove the temp frame
430 addptr(rsp, frame_size_in_bytes);
431 pop(rbp);
432
433 // Check if we need to extend the stack for packing
434 int sp_inc = 0;
435 if (args_on_stack > args_on_stack_cc) {
436 sp_inc = extend_stack_for_inline_args(args_on_stack);
437 }
438
439 shuffle_inline_args(true, is_inline_ro_entry, sig_cc,
440 args_passed_cc, args_on_stack_cc, regs_cc, // from
441 args_passed, args_on_stack, regs, // to
442 sp_inc, rax);
443
444 // Create the real frame. Below jump will then skip over the stack banging and frame
445 // setup code in the verified_inline_entry (which has a different real_frame_size).
446 build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, sp_inc, false, ces->c1_needs_stack_repair());
447
448 jmp(verified_inline_entry_label);
449 return rt_call_offset;
450 }
451
452 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
453 // rbp, + 0: link
454 // + 1: return address
455 // + 2: argument with offset 0
456 // + 3: argument with offset 1
457 // + 4: ...
458
459 movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
460 }
461
462 #ifndef PRODUCT
463
464 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
465 if (!VerifyOops) return;
466 verify_oop_addr(Address(rsp, stack_offset));
467 }
468
469 void C1_MacroAssembler::verify_not_null_oop(Register r) {
470 if (!VerifyOops) return;
471 Label not_null;
|