23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "c1/c1_MacroAssembler.hpp"
29 #include "c1/c1_Runtime1.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "gc/shared/collectedHeap.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "oops/arrayOop.hpp"
34 #include "oops/markWord.hpp"
35 #include "runtime/basicLock.hpp"
36 #include "runtime/biasedLocking.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/sharedRuntime.hpp"
39 #include "runtime/stubRoutines.hpp"
40
41 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
42 Label ic_miss, ic_hit;
43 verify_oop(receiver);
44 int klass_offset = oopDesc::klass_offset_in_bytes();
45
46 if (!ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(klass_offset)) {
47 if (VM_Version::has_CompareBranch()) {
48 z_cgij(receiver, 0, Assembler::bcondEqual, ic_miss);
49 } else {
50 z_ltgr(receiver, receiver);
51 z_bre(ic_miss);
52 }
53 }
54
55 compare_klass_ptr(iCache, klass_offset, receiver, false);
56 z_bre(ic_hit);
57
58 // If icache check fails, then jump to runtime routine.
59 // Note: RECEIVER must still contain the receiver!
60 load_const_optimized(Z_R1_scratch, AddressLiteral(SharedRuntime::get_ic_miss_stub()));
61 z_br(Z_R1_scratch);
62 align(CodeEntryAlignment);
63 bind(ic_hit);
66 void C1_MacroAssembler::explicit_null_check(Register base) {
67 ShouldNotCallThis(); // unused
68 }
69
70 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
71 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
72 generate_stack_overflow_check(bang_size_in_bytes);
73 save_return_pc();
74 push_frame(frame_size_in_bytes);
75 }
76
77 void C1_MacroAssembler::verified_entry() {
78 if (C1Breakpoint) z_illtrap(0xC1);
79 }
80
81 void C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
82 const int hdr_offset = oopDesc::mark_offset_in_bytes();
83 assert_different_registers(hdr, obj, disp_hdr);
84 NearLabel done;
85
86 verify_oop(obj);
87
88 // Load object header.
89 z_lg(hdr, Address(obj, hdr_offset));
90
91 // Save object being locked into the BasicObjectLock...
92 z_stg(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
93
94 if (UseBiasedLocking) {
95 biased_locking_enter(obj, hdr, Z_R1_scratch, Z_R0_scratch, done, &slow_case);
96 }
97
98 // and mark it as unlocked.
99 z_oill(hdr, markWord::unlocked_value);
100 // Save unlocked object header into the displaced header location on the stack.
101 z_stg(hdr, Address(disp_hdr, (intptr_t)0));
102 // Test if object header is still the same (i.e. unlocked), and if so, store the
103 // displaced header address in the object header. If it is not the same, get the
104 // object header instead.
105 z_csg(hdr, disp_hdr, hdr_offset, obj);
106 // If the object header was the same, we're done.
141 void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
142 const int aligned_mask = BytesPerWord -1;
143 const int hdr_offset = oopDesc::mark_offset_in_bytes();
144 assert_different_registers(hdr, obj, disp_hdr);
145 NearLabel done;
146
147 if (UseBiasedLocking) {
148 // Load object.
149 z_lg(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
150 biased_locking_exit(obj, hdr, done);
151 }
152
153 // Load displaced header.
154 z_ltg(hdr, Address(disp_hdr, (intptr_t)0));
155 // If the loaded hdr is NULL we had recursive locking, and we are done.
156 z_bre(done);
157 if (!UseBiasedLocking) {
158 // Load object.
159 z_lg(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
160 }
161 verify_oop(obj);
162 // Test if object header is pointing to the displaced header, and if so, restore
163 // the displaced header in the object. If the object header is not pointing to
164 // the displaced header, get the object header instead.
165 z_csg(disp_hdr, hdr, hdr_offset, obj);
166 // If the object header was not pointing to the displaced header,
167 // we do unlocking via runtime call.
168 branch_optimized(Assembler::bcondNotEqual, slow_case);
169 // done
170 bind(done);
171 }
172
173 void C1_MacroAssembler::try_allocate(
174 Register obj, // result: Pointer to object after successful allocation.
175 Register var_size_in_bytes, // Object size in bytes if unknown at compile time; invalid otherwise.
176 int con_size_in_bytes, // Object size in bytes if known at compile time.
177 Register t1, // Temp register: Must be global register for incr_allocated_bytes.
178 Label& slow_case // Continuation point if fast allocation fails.
179 ) {
180 if (UseTLAB) {
181 tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
261 if (con_size_in_bytes <= threshold) {
262 // Use explicit null stores.
263 // code size = 6*n bytes (n = number of fields to clear)
264 for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord)
265 z_stg(Rzero, Address(obj, i));
266 } else {
267 // Code size generated by initialize_body() is 16.
268 Register object_fields = Z_R0_scratch;
269 Register len_in_bytes = Z_R1_scratch;
270 z_la(object_fields, hdr_size_in_bytes, obj);
271 load_const_optimized(len_in_bytes, con_size_in_bytes - hdr_size_in_bytes);
272 initialize_body(object_fields, len_in_bytes, Rzero);
273 }
274
275 // Dtrace support is unimplemented.
276 // if (CURRENT_ENV->dtrace_alloc_probes()) {
277 // assert(obj == rax, "must be");
278 // call(RuntimeAddress(Runtime1::entry_for (Runtime1::dtrace_object_alloc_id)));
279 // }
280
281 verify_oop(obj);
282 }
283
284 void C1_MacroAssembler::allocate_array(
285 Register obj, // result: Pointer to array after successful allocation.
286 Register len, // array length
287 Register t1, // temp register
288 Register t2, // temp register
289 int hdr_size, // object header size in words
290 int elt_size, // element size in bytes
291 Register klass, // object klass
292 Label& slow_case // Continuation point if fast allocation fails.
293 ) {
294 assert_different_registers(obj, len, t1, t2, klass);
295
296 // Determine alignment mask.
297 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
298
299 // Check for negative or excessive length.
300 compareU64_and_branch(len, (int32_t)max_array_allocation_length, bcondHigh, slow_case);
301
319
320 initialize_header(obj, klass, len, noreg, t1);
321
322 // Clear rest of allocated space.
323 Label done;
324 Register object_fields = t1;
325 Register Rzero = Z_R1_scratch;
326 z_aghi(arr_size, -(hdr_size * BytesPerWord));
327 z_bre(done); // Jump if size of fields is zero.
328 z_la(object_fields, hdr_size * BytesPerWord, obj);
329 z_xgr(Rzero, Rzero);
330 initialize_body(object_fields, arr_size, Rzero);
331 bind(done);
332
333 // Dtrace support is unimplemented.
334 // if (CURRENT_ENV->dtrace_alloc_probes()) {
335 // assert(obj == rax, "must be");
336 // call(RuntimeAddress(Runtime1::entry_for (Runtime1::dtrace_object_alloc_id)));
337 // }
338
339 verify_oop(obj);
340 }
341
342
343 #ifndef PRODUCT
344
345 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
346 Unimplemented();
347 // if (!VerifyOops) return;
348 // verify_oop_addr(Address(SP, stack_offset + STACK_BIAS));
349 }
350
351 void C1_MacroAssembler::verify_not_null_oop(Register r) {
352 if (!VerifyOops) return;
353 NearLabel not_null;
354 compareU64_and_branch(r, (intptr_t)0, bcondNotEqual, not_null);
355 stop("non-null oop required");
356 bind(not_null);
357 verify_oop(r);
358 }
359
360 void C1_MacroAssembler::invalidate_registers(Register preserve1,
361 Register preserve2,
362 Register preserve3) {
363 Register dead_value = noreg;
364 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
365 Register r = as_Register(i);
366 if (r != preserve1 && r != preserve2 && r != preserve3 && r != Z_SP && r != Z_thread) {
367 if (dead_value == noreg) {
368 load_const_optimized(r, 0xc1dead);
369 dead_value = r;
370 } else {
371 z_lgr(r, dead_value);
372 }
373 }
374 }
375 }
376
377 #endif // !PRODUCT
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23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "c1/c1_MacroAssembler.hpp"
29 #include "c1/c1_Runtime1.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "gc/shared/collectedHeap.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "oops/arrayOop.hpp"
34 #include "oops/markWord.hpp"
35 #include "runtime/basicLock.hpp"
36 #include "runtime/biasedLocking.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/sharedRuntime.hpp"
39 #include "runtime/stubRoutines.hpp"
40
41 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
42 Label ic_miss, ic_hit;
43 verify_oop(receiver, FILE_AND_LINE);
44 int klass_offset = oopDesc::klass_offset_in_bytes();
45
46 if (!ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(klass_offset)) {
47 if (VM_Version::has_CompareBranch()) {
48 z_cgij(receiver, 0, Assembler::bcondEqual, ic_miss);
49 } else {
50 z_ltgr(receiver, receiver);
51 z_bre(ic_miss);
52 }
53 }
54
55 compare_klass_ptr(iCache, klass_offset, receiver, false);
56 z_bre(ic_hit);
57
58 // If icache check fails, then jump to runtime routine.
59 // Note: RECEIVER must still contain the receiver!
60 load_const_optimized(Z_R1_scratch, AddressLiteral(SharedRuntime::get_ic_miss_stub()));
61 z_br(Z_R1_scratch);
62 align(CodeEntryAlignment);
63 bind(ic_hit);
66 void C1_MacroAssembler::explicit_null_check(Register base) {
67 ShouldNotCallThis(); // unused
68 }
69
70 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
71 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
72 generate_stack_overflow_check(bang_size_in_bytes);
73 save_return_pc();
74 push_frame(frame_size_in_bytes);
75 }
76
77 void C1_MacroAssembler::verified_entry() {
78 if (C1Breakpoint) z_illtrap(0xC1);
79 }
80
81 void C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
82 const int hdr_offset = oopDesc::mark_offset_in_bytes();
83 assert_different_registers(hdr, obj, disp_hdr);
84 NearLabel done;
85
86 verify_oop(obj, FILE_AND_LINE);
87
88 // Load object header.
89 z_lg(hdr, Address(obj, hdr_offset));
90
91 // Save object being locked into the BasicObjectLock...
92 z_stg(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
93
94 if (UseBiasedLocking) {
95 biased_locking_enter(obj, hdr, Z_R1_scratch, Z_R0_scratch, done, &slow_case);
96 }
97
98 // and mark it as unlocked.
99 z_oill(hdr, markWord::unlocked_value);
100 // Save unlocked object header into the displaced header location on the stack.
101 z_stg(hdr, Address(disp_hdr, (intptr_t)0));
102 // Test if object header is still the same (i.e. unlocked), and if so, store the
103 // displaced header address in the object header. If it is not the same, get the
104 // object header instead.
105 z_csg(hdr, disp_hdr, hdr_offset, obj);
106 // If the object header was the same, we're done.
141 void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
142 const int aligned_mask = BytesPerWord -1;
143 const int hdr_offset = oopDesc::mark_offset_in_bytes();
144 assert_different_registers(hdr, obj, disp_hdr);
145 NearLabel done;
146
147 if (UseBiasedLocking) {
148 // Load object.
149 z_lg(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
150 biased_locking_exit(obj, hdr, done);
151 }
152
153 // Load displaced header.
154 z_ltg(hdr, Address(disp_hdr, (intptr_t)0));
155 // If the loaded hdr is NULL we had recursive locking, and we are done.
156 z_bre(done);
157 if (!UseBiasedLocking) {
158 // Load object.
159 z_lg(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
160 }
161 verify_oop(obj, FILE_AND_LINE);
162 // Test if object header is pointing to the displaced header, and if so, restore
163 // the displaced header in the object. If the object header is not pointing to
164 // the displaced header, get the object header instead.
165 z_csg(disp_hdr, hdr, hdr_offset, obj);
166 // If the object header was not pointing to the displaced header,
167 // we do unlocking via runtime call.
168 branch_optimized(Assembler::bcondNotEqual, slow_case);
169 // done
170 bind(done);
171 }
172
173 void C1_MacroAssembler::try_allocate(
174 Register obj, // result: Pointer to object after successful allocation.
175 Register var_size_in_bytes, // Object size in bytes if unknown at compile time; invalid otherwise.
176 int con_size_in_bytes, // Object size in bytes if known at compile time.
177 Register t1, // Temp register: Must be global register for incr_allocated_bytes.
178 Label& slow_case // Continuation point if fast allocation fails.
179 ) {
180 if (UseTLAB) {
181 tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
261 if (con_size_in_bytes <= threshold) {
262 // Use explicit null stores.
263 // code size = 6*n bytes (n = number of fields to clear)
264 for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord)
265 z_stg(Rzero, Address(obj, i));
266 } else {
267 // Code size generated by initialize_body() is 16.
268 Register object_fields = Z_R0_scratch;
269 Register len_in_bytes = Z_R1_scratch;
270 z_la(object_fields, hdr_size_in_bytes, obj);
271 load_const_optimized(len_in_bytes, con_size_in_bytes - hdr_size_in_bytes);
272 initialize_body(object_fields, len_in_bytes, Rzero);
273 }
274
275 // Dtrace support is unimplemented.
276 // if (CURRENT_ENV->dtrace_alloc_probes()) {
277 // assert(obj == rax, "must be");
278 // call(RuntimeAddress(Runtime1::entry_for (Runtime1::dtrace_object_alloc_id)));
279 // }
280
281 verify_oop(obj, FILE_AND_LINE);
282 }
283
284 void C1_MacroAssembler::allocate_array(
285 Register obj, // result: Pointer to array after successful allocation.
286 Register len, // array length
287 Register t1, // temp register
288 Register t2, // temp register
289 int hdr_size, // object header size in words
290 int elt_size, // element size in bytes
291 Register klass, // object klass
292 Label& slow_case // Continuation point if fast allocation fails.
293 ) {
294 assert_different_registers(obj, len, t1, t2, klass);
295
296 // Determine alignment mask.
297 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
298
299 // Check for negative or excessive length.
300 compareU64_and_branch(len, (int32_t)max_array_allocation_length, bcondHigh, slow_case);
301
319
320 initialize_header(obj, klass, len, noreg, t1);
321
322 // Clear rest of allocated space.
323 Label done;
324 Register object_fields = t1;
325 Register Rzero = Z_R1_scratch;
326 z_aghi(arr_size, -(hdr_size * BytesPerWord));
327 z_bre(done); // Jump if size of fields is zero.
328 z_la(object_fields, hdr_size * BytesPerWord, obj);
329 z_xgr(Rzero, Rzero);
330 initialize_body(object_fields, arr_size, Rzero);
331 bind(done);
332
333 // Dtrace support is unimplemented.
334 // if (CURRENT_ENV->dtrace_alloc_probes()) {
335 // assert(obj == rax, "must be");
336 // call(RuntimeAddress(Runtime1::entry_for (Runtime1::dtrace_object_alloc_id)));
337 // }
338
339 verify_oop(obj, FILE_AND_LINE);
340 }
341
342
343 #ifndef PRODUCT
344
345 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
346 if (!VerifyOops) return;
347 verify_oop_addr(Address(Z_SP, stack_offset), FILE_AND_LINE);
348 }
349
350 void C1_MacroAssembler::verify_not_null_oop(Register r) {
351 if (!VerifyOops) return;
352 NearLabel not_null;
353 compareU64_and_branch(r, (intptr_t)0, bcondNotEqual, not_null);
354 stop("non-null oop required");
355 bind(not_null);
356 verify_oop(r, FILE_AND_LINE);
357 }
358
359 void C1_MacroAssembler::invalidate_registers(Register preserve1,
360 Register preserve2,
361 Register preserve3) {
362 Register dead_value = noreg;
363 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
364 Register r = as_Register(i);
365 if (r != preserve1 && r != preserve2 && r != preserve3 && r != Z_SP && r != Z_thread) {
366 if (dead_value == noreg) {
367 load_const_optimized(r, 0xc1dead);
368 dead_value = r;
369 } else {
370 z_lgr(r, dead_value);
371 }
372 }
373 }
374 }
375
376 #endif // !PRODUCT
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