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
41 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
42 const int aligned_mask = BytesPerWord -1;
43 const int hdr_offset = oopDesc::mark_offset_in_bytes();
44 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
45 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
46 Label done;
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_in_bytes()), obj);
53
54 null_check_offset = offset();
55
56 if (DiagnoseSyncOnValueBasedClasses != 0) {
57 load_klass(hdr, obj, rscratch1);
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 // and mark it as unlocked
66 orptr(hdr, markWord::unlocked_value);
67 // save unlocked object header into the displaced header location on the stack
68 movptr(Address(disp_hdr, 0), hdr);
69 // test if object header is still the same (i.e. unlocked), and if so, store the
70 // displaced header address in the object header - if it is not the same, get the
71 // object header instead
72 MacroAssembler::lock(); // must be immediately before cmpxchg!
73 cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
74 // if the object header was the same, we're done
75 jcc(Assembler::equal, done);
76 // if the object header was not the same, it is now in the hdr register
77 // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
78 //
79 // 1) (hdr & aligned_mask) == 0
80 // 2) rsp <= hdr
81 // 3) hdr <= rsp + page_size
82 //
83 // these 3 tests can be done by evaluating the following expression:
84 //
85 // (hdr - rsp) & (aligned_mask - page_size)
86 //
128 jcc(Assembler::notEqual, slow_case);
129 // done
130 bind(done);
131
132 dec_held_monitor_count();
133 }
134
135
136 // Defines obj, preserves var_size_in_bytes
137 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
138 if (UseTLAB) {
139 tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
140 } else {
141 jmp(slow_case);
142 }
143 }
144
145
146 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
147 assert_different_registers(obj, klass, len);
148 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
149 #ifdef _LP64
150 if (UseCompressedClassPointers) { // Take care not to kill klass
151 movptr(t1, klass);
152 encode_klass_not_null(t1, rscratch1);
153 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
154 } else
155 #endif
156 {
157 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
158 }
159
160 if (len->is_valid()) {
161 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
162 }
163 #ifdef _LP64
164 else if (UseCompressedClassPointers) {
165 xorptr(t1, t1);
166 store_klass_gap(obj, t1);
167 }
168 #endif
282 verify_oop(receiver);
283 // explicit NULL check not needed since load from [klass_offset] causes a trap
284 // check against inline cache
285 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
286 int start_offset = offset();
287
288 if (UseCompressedClassPointers) {
289 load_klass(rscratch1, receiver, rscratch2);
290 cmpptr(rscratch1, iCache);
291 } else {
292 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
293 }
294 // if icache check fails, then jump to runtime routine
295 // Note: RECEIVER must still contain the receiver!
296 jump_cc(Assembler::notEqual,
297 RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
298 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
299 assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
300 }
301
302
303 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
304 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
305 // Make sure there is enough stack space for this method's activation.
306 // Note that we do this before doing an enter(). This matches the
307 // ordering of C2's stack overflow check / rsp decrement and allows
308 // the SharedRuntime stack overflow handling to be consistent
309 // between the two compilers.
310 generate_stack_overflow_check(bang_size_in_bytes);
311
312 push(rbp);
313 if (PreserveFramePointer) {
314 mov(rbp, rsp);
315 }
316 #if !defined(_LP64) && defined(COMPILER2)
317 if (UseSSE < 2 && !CompilerConfig::is_c1_only_no_jvmci()) {
318 // c2 leaves fpu stack dirty. Clean it on entry
319 empty_FPU_stack();
320 }
321 #endif // !_LP64 && COMPILER2
322 decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0
323
324 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
325 // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
326 bs->nmethod_entry_barrier(this, NULL /* slow_path */, NULL /* continuation */);
327 }
328
329
330 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) {
331 increment(rsp, frame_size_in_bytes); // Does not emit code for frame_size == 0
332 pop(rbp);
333 }
334
335
336 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
337 if (breakAtEntry || VerifyFPU) {
338 // Verified Entry first instruction should be 5 bytes long for correct
339 // patching by patch_verified_entry().
340 //
341 // Breakpoint and VerifyFPU have one byte first instruction.
342 // Also first instruction will be one byte "push(rbp)" if stack banging
343 // code is not generated (see build_frame() above).
344 // For all these cases generate long instruction first.
345 fat_nop();
346 }
347 if (breakAtEntry) int3();
348 // build frame
349 IA32_ONLY( verify_FPU(0, "method_entry"); )
350 }
351
352 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
353 // rbp, + 0: link
354 // + 1: return address
355 // + 2: argument with offset 0
356 // + 3: argument with offset 1
357 // + 4: ...
358
359 movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
360 }
361
362 #ifndef PRODUCT
363
364 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
365 if (!VerifyOops) return;
366 verify_oop_addr(Address(rsp, stack_offset));
367 }
368
369 void C1_MacroAssembler::verify_not_null_oop(Register r) {
370 if (!VerifyOops) return;
371 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
42 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, 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(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
47 Label done;
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_in_bytes()), obj);
54
55 null_check_offset = offset();
56
57 if (DiagnoseSyncOnValueBasedClasses != 0) {
58 load_klass(hdr, obj, rscratch1);
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 // and mark it as unlocked
67 orptr(hdr, markWord::unlocked_value);
68 if (EnableValhalla) {
69 // Mask inline_type bit such that we go to the slow path if object is an inline type
70 andptr(hdr, ~((int) markWord::inline_type_bit_in_place));
71 }
72 // save unlocked object header into the displaced header location on the stack
73 movptr(Address(disp_hdr, 0), hdr);
74 // test if object header is still the same (i.e. unlocked), and if so, store the
75 // displaced header address in the object header - if it is not the same, get the
76 // object header instead
77 MacroAssembler::lock(); // must be immediately before cmpxchg!
78 cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
79 // if the object header was the same, we're done
80 jcc(Assembler::equal, done);
81 // if the object header was not the same, it is now in the hdr register
82 // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
83 //
84 // 1) (hdr & aligned_mask) == 0
85 // 2) rsp <= hdr
86 // 3) hdr <= rsp + page_size
87 //
88 // these 3 tests can be done by evaluating the following expression:
89 //
90 // (hdr - rsp) & (aligned_mask - page_size)
91 //
133 jcc(Assembler::notEqual, slow_case);
134 // done
135 bind(done);
136
137 dec_held_monitor_count();
138 }
139
140
141 // Defines obj, preserves var_size_in_bytes
142 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
143 if (UseTLAB) {
144 tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
145 } else {
146 jmp(slow_case);
147 }
148 }
149
150
151 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
152 assert_different_registers(obj, klass, len);
153 if (EnableValhalla) {
154 // Need to copy markWord::prototype header for klass
155 assert_different_registers(obj, klass, len, t1, t2);
156 movptr(t1, Address(klass, Klass::prototype_header_offset()));
157 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
158 } else {
159 // This assumes that all prototype bits fit in an int32_t
160 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
161 }
162 #ifdef _LP64
163 if (UseCompressedClassPointers) { // Take care not to kill klass
164 movptr(t1, klass);
165 encode_klass_not_null(t1, rscratch1);
166 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
167 } else
168 #endif
169 {
170 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
171 }
172
173 if (len->is_valid()) {
174 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
175 }
176 #ifdef _LP64
177 else if (UseCompressedClassPointers) {
178 xorptr(t1, t1);
179 store_klass_gap(obj, t1);
180 }
181 #endif
295 verify_oop(receiver);
296 // explicit NULL check not needed since load from [klass_offset] causes a trap
297 // check against inline cache
298 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
299 int start_offset = offset();
300
301 if (UseCompressedClassPointers) {
302 load_klass(rscratch1, receiver, rscratch2);
303 cmpptr(rscratch1, iCache);
304 } else {
305 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
306 }
307 // if icache check fails, then jump to runtime routine
308 // Note: RECEIVER must still contain the receiver!
309 jump_cc(Assembler::notEqual,
310 RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
311 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
312 assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
313 }
314
315 void C1_MacroAssembler::build_frame_helper(int frame_size_in_bytes, int sp_inc, bool needs_stack_repair) {
316 push(rbp);
317 if (PreserveFramePointer) {
318 mov(rbp, rsp);
319 }
320 #if !defined(_LP64) && defined(COMPILER2)
321 if (UseSSE < 2 && !CompilerConfig::is_c1_only_no_jvmci()) {
322 // c2 leaves fpu stack dirty. Clean it on entry
323 empty_FPU_stack();
324 }
325 #endif // !_LP64 && COMPILER2
326 decrement(rsp, frame_size_in_bytes);
327
328 if (needs_stack_repair) {
329 // Save stack increment (also account for fixed framesize and rbp)
330 assert((sp_inc & (StackAlignmentInBytes-1)) == 0, "stack increment not aligned");
331 int real_frame_size = sp_inc + frame_size_in_bytes + wordSize;
332 movptr(Address(rsp, frame_size_in_bytes - wordSize), real_frame_size);
333 }
334 }
335
336 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) {
337 if (has_scalarized_args) {
338 // Initialize orig_pc to detect deoptimization during buffering in the entry points
339 movptr(Address(rsp, sp_offset_for_orig_pc - frame_size_in_bytes - wordSize), 0);
340 }
341 if (!needs_stack_repair && verified_inline_entry_label != NULL) {
342 bind(*verified_inline_entry_label);
343 }
344 // Make sure there is enough stack space for this method's activation.
345 // Note that we do this before doing an enter(). This matches the
346 // ordering of C2's stack overflow check / rsp decrement and allows
347 // the SharedRuntime stack overflow handling to be consistent
348 // between the two compilers.
349 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
350 generate_stack_overflow_check(bang_size_in_bytes);
351
352 build_frame_helper(frame_size_in_bytes, 0, needs_stack_repair);
353
354 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
355 // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
356 bs->nmethod_entry_barrier(this, NULL /* slow_path */, NULL /* continuation */);
357
358 if (needs_stack_repair && verified_inline_entry_label != NULL) {
359 // Jump here from the scalarized entry points that require additional stack space
360 // for packing scalarized arguments and therefore already created the frame.
361 bind(*verified_inline_entry_label);
362 }
363 }
364
365 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
366 if (breakAtEntry || VerifyFPU) {
367 // Verified Entry first instruction should be 5 bytes long for correct
368 // patching by patch_verified_entry().
369 //
370 // Breakpoint and VerifyFPU have one byte first instruction.
371 // Also first instruction will be one byte "push(rbp)" if stack banging
372 // code is not generated (see build_frame() above).
373 // For all these cases generate long instruction first.
374 fat_nop();
375 }
376 if (breakAtEntry) int3();
377 // build frame
378 IA32_ONLY( verify_FPU(0, "method_entry"); )
379 }
380
381 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) {
382 assert(InlineTypePassFieldsAsArgs, "sanity");
383 // Make sure there is enough stack space for this method's activation.
384 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
385 generate_stack_overflow_check(bang_size_in_bytes);
386
387 GrowableArray<SigEntry>* sig = &ces->sig();
388 GrowableArray<SigEntry>* sig_cc = is_inline_ro_entry ? &ces->sig_cc_ro() : &ces->sig_cc();
389 VMRegPair* regs = ces->regs();
390 VMRegPair* regs_cc = is_inline_ro_entry ? ces->regs_cc_ro() : ces->regs_cc();
391 int args_on_stack = ces->args_on_stack();
392 int args_on_stack_cc = is_inline_ro_entry ? ces->args_on_stack_cc_ro() : ces->args_on_stack_cc();
393
394 assert(sig->length() <= sig_cc->length(), "Zero-sized inline class not allowed!");
395 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig_cc->length());
396 int args_passed = sig->length();
397 int args_passed_cc = SigEntry::fill_sig_bt(sig_cc, sig_bt);
398
399 // Check if we need to extend the stack for packing
400 int sp_inc = 0;
401 if (args_on_stack > args_on_stack_cc) {
402 sp_inc = extend_stack_for_inline_args(args_on_stack);
403 }
404
405 // Create a temp frame so we can call into the runtime. It must be properly set up to accommodate GC.
406 build_frame_helper(frame_size_in_bytes, sp_inc, ces->c1_needs_stack_repair());
407
408 // Initialize orig_pc to detect deoptimization during buffering in below runtime call
409 movptr(Address(rsp, sp_offset_for_orig_pc), 0);
410
411 // The runtime call might safepoint, make sure nmethod entry barrier is executed
412 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
413 bs->nmethod_entry_barrier(this, NULL /* slow_path */, NULL /* continuation */);
414
415 // FIXME -- call runtime only if we cannot in-line allocate all the incoming inline type args.
416 movptr(rbx, (intptr_t)(ces->method()));
417 if (is_inline_ro_entry) {
418 call(RuntimeAddress(Runtime1::entry_for(Runtime1::buffer_inline_args_no_receiver_id)));
419 } else {
420 call(RuntimeAddress(Runtime1::entry_for(Runtime1::buffer_inline_args_id)));
421 }
422 int rt_call_offset = offset();
423
424 // Remove the temp frame
425 addptr(rsp, frame_size_in_bytes);
426 pop(rbp);
427
428 shuffle_inline_args(true, is_inline_ro_entry, sig_cc,
429 args_passed_cc, args_on_stack_cc, regs_cc, // from
430 args_passed, args_on_stack, regs, // to
431 sp_inc, rax);
432
433 if (ces->c1_needs_stack_repair()) {
434 // Create the real frame. Below jump will then skip over the stack banging and frame
435 // setup code in the verified_inline_entry (which has a different real_frame_size).
436 build_frame_helper(frame_size_in_bytes, sp_inc, true);
437 }
438
439 jmp(verified_inline_entry_label);
440 return rt_call_offset;
441 }
442
443 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
444 // rbp, + 0: link
445 // + 1: return address
446 // + 2: argument with offset 0
447 // + 3: argument with offset 1
448 // + 4: ...
449
450 movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
451 }
452
453 #ifndef PRODUCT
454
455 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
456 if (!VerifyOops) return;
457 verify_oop_addr(Address(rsp, stack_offset));
458 }
459
460 void C1_MacroAssembler::verify_not_null_oop(Register r) {
461 if (!VerifyOops) return;
462 Label not_null;
|