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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 "c1/c1_MacroAssembler.hpp"
 26 #include "c1/c1_Runtime1.hpp"
 27 #include "code/compiledIC.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/globals.hpp"
 38 #include "runtime/os.hpp"
 39 #include "runtime/sharedRuntime.hpp"
 40 #include "runtime/stubRoutines.hpp"
 41 #include "utilities/checkedCast.hpp"
 42 #include "utilities/globalDefinitions.hpp"
 43 
 44 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register tmp, Label& slow_case) {
 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   lightweight_lock(disp_hdr, obj, hdr, tmp, slow_case);

 65   // load object
 66   movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset()));
 67   verify_oop(obj);
 68 
 69   lightweight_unlock(obj, disp_hdr, hdr, slow_case);
 70 }
 71 
 72 
 73 // Defines obj, preserves var_size_in_bytes
 74 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
 75   if (UseTLAB) {
 76     tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
 77   } else {
 78     jmp(slow_case);
 79   }
 80 }
 81 
 82 
 83 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
 84   assert_different_registers(obj, klass, len, t1, t2);
 85   if (UseCompactObjectHeaders) {



 86     movptr(t1, Address(klass, Klass::prototype_header_offset()));
 87     movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
 88   } else if (UseCompressedClassPointers) { // Take care not to kill klass
 89     movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
 90     movptr(t1, klass);
 91     encode_klass_not_null(t1, rscratch1);
 92     movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
 93   } else {

 94     movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
 95     movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);










 96   }
 97 
 98   if (len->is_valid()) {
 99     movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
100     int base_offset = arrayOopDesc::length_offset_in_bytes() + BytesPerInt;
101     if (!is_aligned(base_offset, BytesPerWord)) {
102       assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
103       // Clear gap/first 4 bytes following the length field.
104       xorl(t1, t1);
105       movl(Address(obj, base_offset), t1);
106     }
107   } else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
108     xorptr(t1, t1);
109     store_klass_gap(obj, t1);
110   }
111 }
112 
113 
114 // preserves obj, destroys len_in_bytes
115 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {

205 
206   initialize_header(obj, klass, len, t1, t2);
207 
208   // clear rest of allocated space
209   if (zero_array) {
210     const Register len_zero = len;
211     // Align-up to word boundary, because we clear the 4 bytes potentially
212     // following the length field in initialize_header().
213     int base_offset = align_up(base_offset_in_bytes, BytesPerWord);
214     initialize_body(obj, arr_size, base_offset, len_zero);
215   }
216 
217   if (CURRENT_ENV->dtrace_alloc_probes()) {
218     assert(obj == rax, "must be");
219     call(RuntimeAddress(Runtime1::entry_for(StubId::c1_dtrace_object_alloc_id)));
220   }
221 
222   verify_oop(obj);
223 }
224 
225 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
226   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");


















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

232   generate_stack_overflow_check(bang_size_in_bytes);
233 
234   push(rbp);
235   if (PreserveFramePointer) {
236     mov(rbp, rsp);
237   }
238   decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0
239 
240   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
241   // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
242   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);
243 }
244 
245 
246 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) {
247   increment(rsp, frame_size_in_bytes);  // Does not emit code for frame_size == 0
248   pop(rbp);

249 }
250 
251 
252 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
253   if (breakAtEntry) int3();
254   // build frame
255 }
256 


























































257 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
258   // rbp, + 0: link
259   //     + 1: return address
260   //     + 2: argument with offset 0
261   //     + 3: argument with offset 1
262   //     + 4: ...
263 
264   movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
265 }
266 
267 #ifndef PRODUCT
268 
269 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
270   if (!VerifyOops) return;
271   verify_oop_addr(Address(rsp, stack_offset));
272 }
273 
274 void C1_MacroAssembler::verify_not_null_oop(Register r) {
275   if (!VerifyOops) return;
276   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 "c1/c1_MacroAssembler.hpp"
 26 #include "c1/c1_Runtime1.hpp"
 27 #include "code/compiledIC.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/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   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   lightweight_lock(disp_hdr, obj, hdr, tmp, slow_case);

 66   // load object
 67   movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset()));
 68   verify_oop(obj);
 69 
 70   lightweight_unlock(obj, disp_hdr, hdr, slow_case);
 71 }
 72 
 73 
 74 // Defines obj, preserves var_size_in_bytes
 75 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
 76   if (UseTLAB) {
 77     tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
 78   } else {
 79     jmp(slow_case);
 80   }
 81 }
 82 
 83 
 84 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
 85   assert_different_registers(obj, klass, len, t1, t2);
 86   if (UseCompactObjectHeaders || EnableValhalla) {
 87     // COH: Markword contains class pointer which is only known at runtime.
 88     // Valhalla: Could have value class which has a different prototype header to a normal object.
 89     // In both cases, we need to fetch dynamically.
 90     movptr(t1, Address(klass, Klass::prototype_header_offset()));
 91     movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);





 92   } else {
 93     // Otherwise: Can use the statically computed prototype header which is the same for every object.
 94     movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
 95   }
 96   if (!UseCompactObjectHeaders) {
 97     // COH: Markword already contains class pointer. Nothing else to do.
 98     // Otherwise: Fetch klass pointer following the markword
 99     if (UseCompressedClassPointers) { // Take care not to kill klass
100       movptr(t1, klass);
101       encode_klass_not_null(t1, rscratch1);
102       movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
103     } else {
104       movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
105     }
106   }
107 
108   if (len->is_valid()) {
109     movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
110     int base_offset = arrayOopDesc::length_offset_in_bytes() + BytesPerInt;
111     if (!is_aligned(base_offset, BytesPerWord)) {
112       assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
113       // Clear gap/first 4 bytes following the length field.
114       xorl(t1, t1);
115       movl(Address(obj, base_offset), t1);
116     }
117   } else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
118     xorptr(t1, t1);
119     store_klass_gap(obj, t1);
120   }
121 }
122 
123 
124 // preserves obj, destroys len_in_bytes
125 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {

215 
216   initialize_header(obj, klass, len, t1, t2);
217 
218   // clear rest of allocated space
219   if (zero_array) {
220     const Register len_zero = len;
221     // Align-up to word boundary, because we clear the 4 bytes potentially
222     // following the length field in initialize_header().
223     int base_offset = align_up(base_offset_in_bytes, BytesPerWord);
224     initialize_body(obj, arr_size, base_offset, len_zero);
225   }
226 
227   if (CURRENT_ENV->dtrace_alloc_probes()) {
228     assert(obj == rax, "must be");
229     call(RuntimeAddress(Runtime1::entry_for(StubId::c1_dtrace_object_alloc_id)));
230   }
231 
232   verify_oop(obj);
233 }
234 
235 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) {
236   push(rbp);
237   if (PreserveFramePointer) {
238     mov(rbp, rsp);
239   }
240   decrement(rsp, frame_size_in_bytes);
241 
242   if (needs_stack_repair) {
243     // Save stack increment (also account for fixed framesize and rbp)
244     assert((sp_inc & (StackAlignmentInBytes-1)) == 0, "stack increment not aligned");
245     int real_frame_size = sp_inc + frame_size_in_bytes + wordSize;
246     movptr(Address(rsp, frame_size_in_bytes - wordSize), real_frame_size);
247   }
248   if (reset_orig_pc) {
249     // Zero orig_pc to detect deoptimization during buffering in the entry points
250     movptr(Address(rsp, sp_offset_for_orig_pc), 0);
251   }
252 }
253 
254 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) {
255   // Make sure there is enough stack space for this method's activation.
256   // Note that we do this before doing an enter(). This matches the
257   // ordering of C2's stack overflow check / rsp decrement and allows
258   // the SharedRuntime stack overflow handling to be consistent
259   // between the two compilers.
260   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
261   generate_stack_overflow_check(bang_size_in_bytes);
262 
263   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, has_scalarized_args, needs_stack_repair);




264 
265   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
266   // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
267   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);


268 
269   if (verified_inline_entry_label != nullptr) {
270     // Jump here from the scalarized entry points that already created the frame.
271     bind(*verified_inline_entry_label);
272   }
273 }
274 

275 void C1_MacroAssembler::verified_entry(bool breakAtEntry) {
276   if (breakAtEntry) int3();
277   // build frame
278 }
279 
280 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) {
281   assert(InlineTypePassFieldsAsArgs, "sanity");
282   // Make sure there is enough stack space for this method's activation.
283   assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
284   generate_stack_overflow_check(bang_size_in_bytes);
285 
286   GrowableArray<SigEntry>* sig    = ces->sig();
287   GrowableArray<SigEntry>* sig_cc = is_inline_ro_entry ? ces->sig_cc_ro() : ces->sig_cc();
288   VMRegPair* regs      = ces->regs();
289   VMRegPair* regs_cc   = is_inline_ro_entry ? ces->regs_cc_ro() : ces->regs_cc();
290   int args_on_stack    = ces->args_on_stack();
291   int args_on_stack_cc = is_inline_ro_entry ? ces->args_on_stack_cc_ro() : ces->args_on_stack_cc();
292 
293   assert(sig->length() <= sig_cc->length(), "Zero-sized inline class not allowed!");
294   BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig_cc->length());
295   int args_passed = sig->length();
296   int args_passed_cc = SigEntry::fill_sig_bt(sig_cc, sig_bt);
297 
298   // Create a temp frame so we can call into the runtime. It must be properly set up to accommodate GC.
299   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, 0, true, ces->c1_needs_stack_repair());
300 
301   // The runtime call might safepoint, make sure nmethod entry barrier is executed
302   BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
303   // C1 code is not hot enough to micro optimize the nmethod entry barrier with an out-of-line stub
304   bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */);
305 
306   // FIXME -- call runtime only if we cannot in-line allocate all the incoming inline type args.
307   movptr(rbx, (intptr_t)(ces->method()));
308   if (is_inline_ro_entry) {
309     call(RuntimeAddress(Runtime1::entry_for(StubId::c1_buffer_inline_args_no_receiver_id)));
310   } else {
311     call(RuntimeAddress(Runtime1::entry_for(StubId::c1_buffer_inline_args_id)));
312   }
313   int rt_call_offset = offset();
314 
315   // Remove the temp frame
316   addptr(rsp, frame_size_in_bytes);
317   pop(rbp);
318 
319   // Check if we need to extend the stack for packing
320   int sp_inc = 0;
321   if (args_on_stack > args_on_stack_cc) {
322     sp_inc = extend_stack_for_inline_args(args_on_stack);
323   }
324 
325   shuffle_inline_args(true, is_inline_ro_entry, sig_cc,
326                       args_passed_cc, args_on_stack_cc, regs_cc, // from
327                       args_passed, args_on_stack, regs,          // to
328                       sp_inc, rax);
329 
330   // Create the real frame. Below jump will then skip over the stack banging and frame
331   // setup code in the verified_inline_entry (which has a different real_frame_size).
332   build_frame_helper(frame_size_in_bytes, sp_offset_for_orig_pc, sp_inc, false, ces->c1_needs_stack_repair());
333 
334   jmp(verified_inline_entry_label);
335   return rt_call_offset;
336 }
337 
338 void C1_MacroAssembler::load_parameter(int offset_in_words, Register reg) {
339   // rbp, + 0: link
340   //     + 1: return address
341   //     + 2: argument with offset 0
342   //     + 3: argument with offset 1
343   //     + 4: ...
344 
345   movptr(reg, Address(rbp, (offset_in_words + 2) * BytesPerWord));
346 }
347 
348 #ifndef PRODUCT
349 
350 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
351   if (!VerifyOops) return;
352   verify_oop_addr(Address(rsp, stack_offset));
353 }
354 
355 void C1_MacroAssembler::verify_not_null_oop(Register r) {
356   if (!VerifyOops) return;
357   Label not_null;
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