30 #include "interp_masm_aarch64.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "oops/compiledICHolder.hpp"
33 #include "oops/instanceKlass.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/sharedRuntime.hpp"
36 #include "vmreg_aarch64.inline.hpp"
37 #ifdef COMPILER2
38 #include "opto/runtime.hpp"
39 #endif
40
41 // machine-dependent part of VtableStubs: create VtableStub of correct size and
42 // initialize its code
43
44 #define __ masm->
45
46 #ifndef PRODUCT
47 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
48 #endif
49
50 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
51 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
52 const int stub_code_length = code_size_limit(true);
53 VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index);
54 // Can be null if there is no free space in the code cache.
55 if (s == nullptr) {
56 return nullptr;
57 }
58
59 // Count unused bytes in instruction sequences of variable size.
60 // We add them to the computed buffer size in order to avoid
61 // overflow in subsequently generated stubs.
62 address start_pc;
63 int slop_bytes = 0;
64 int slop_delta = 0;
65
66 ResourceMark rm;
67 CodeBuffer cb(s->entry_point(), stub_code_length);
68 MacroAssembler* masm = new MacroAssembler(&cb);
69
70 #if (!defined(PRODUCT) && defined(COMPILER2))
71 if (CountCompiledCalls) {
72 __ lea(r16, ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
73 __ increment(Address(r16));
74 }
75 #endif
76
77 // get receiver (need to skip return address on top of stack)
78 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
79
80 // get receiver klass
81 address npe_addr = __ pc();
82 __ load_klass(r16, j_rarg0);
83
84 #ifndef PRODUCT
85 if (DebugVtables) {
99 const ptrdiff_t codesize = __ pc() - start_pc;
100 slop_delta = estimate - codesize; // call_VM varies in length, depending on data
101 slop_bytes += slop_delta;
102 assert(slop_delta >= 0, "vtable #%d: Code size estimate (%d) for DebugVtables too small, required: %d", vtable_index, (int)estimate, (int)codesize);
103
104 __ leave();
105 __ bind(L);
106 }
107 #endif // PRODUCT
108
109 start_pc = __ pc();
110 __ lookup_virtual_method(r16, vtable_index, rmethod);
111 slop_delta = 8 - (int)(__ pc() - start_pc);
112 slop_bytes += slop_delta;
113 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
114
115 #ifndef PRODUCT
116 if (DebugVtables) {
117 Label L;
118 __ cbz(rmethod, L);
119 __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
120 __ cbnz(rscratch1, L);
121 __ stop("Vtable entry is null");
122 __ bind(L);
123 }
124 #endif // PRODUCT
125
126 // r0: receiver klass
127 // rmethod: Method*
128 // r2: receiver
129 address ame_addr = __ pc();
130 __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
131 __ br(rscratch1);
132
133 masm->flush();
134 bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, 0);
135
136 return s;
137 }
138
139
140 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
141 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
142 const int stub_code_length = code_size_limit(false);
143 VtableStub* s = new(stub_code_length) VtableStub(false, itable_index);
144 // Can be null if there is no free space in the code cache.
145 if (s == nullptr) {
146 return nullptr;
147 }
148
149 // Count unused bytes in instruction sequences of variable size.
150 // We add them to the computed buffer size in order to avoid
151 // overflow in subsequently generated stubs.
152 address start_pc;
153 int slop_bytes = 0;
154 int slop_delta = 0;
155
156 ResourceMark rm;
157 CodeBuffer cb(s->entry_point(), stub_code_length);
158 MacroAssembler* masm = new MacroAssembler(&cb);
159
160 #if (!defined(PRODUCT) && defined(COMPILER2))
161 if (CountCompiledCalls) {
162 __ lea(r10, ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
163 __ increment(Address(r10));
164 }
165 #endif
166
167 // get receiver (need to skip return address on top of stack)
168 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
169
170 // Entry arguments:
171 // rscratch2: CompiledICHolder
172 // j_rarg0: Receiver
173
174 // This stub is called from compiled code which has no callee-saved registers,
175 // so all registers except arguments are free at this point.
190 // get receiver klass (also an implicit null-check)
191 address npe_addr = __ pc();
192 __ load_klass(recv_klass_reg, j_rarg0);
193
194 // Receiver subtype check against REFC.
195 // Get selected method from declaring class and itable index
196 __ lookup_interface_method_stub(recv_klass_reg, holder_klass_reg, resolved_klass_reg, rmethod,
197 temp_reg, temp_reg2, itable_index, L_no_such_interface);
198
199 // Reduce "estimate" such that "padding" does not drop below 8.
200 const ptrdiff_t estimate = 124;
201 const ptrdiff_t codesize = __ pc() - start_pc;
202 slop_delta = (int)(estimate - codesize);
203 slop_bytes += slop_delta;
204 assert(slop_delta >= 0, "itable #%d: Code size estimate (%d) for lookup_interface_method too small, required: %d", itable_index, (int)estimate, (int)codesize);
205
206 #ifdef ASSERT
207 if (DebugVtables) {
208 Label L2;
209 __ cbz(rmethod, L2);
210 __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
211 __ cbnz(rscratch1, L2);
212 __ stop("compiler entrypoint is null");
213 __ bind(L2);
214 }
215 #endif // ASSERT
216
217 // rmethod: Method*
218 // j_rarg0: receiver
219 address ame_addr = __ pc();
220 __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
221 __ br(rscratch1);
222
223 __ bind(L_no_such_interface);
224 // Handle IncompatibleClassChangeError in itable stubs.
225 // More detailed error message.
226 // We force resolving of the call site by jumping to the "handle
227 // wrong method" stub, and so let the interpreter runtime do all the
228 // dirty work.
229 assert(SharedRuntime::get_handle_wrong_method_stub() != nullptr, "check initialization order");
230 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
231
232 masm->flush();
233 bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, 0);
234
235 return s;
236 }
237
238 int VtableStub::pd_code_alignment() {
239 // aarch64 cache line size is not an architected constant. We just align on 4 bytes (instruction size).
240 const unsigned int icache_line_size = 4;
241 return icache_line_size;
242 }
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30 #include "interp_masm_aarch64.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "oops/compiledICHolder.hpp"
33 #include "oops/instanceKlass.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/sharedRuntime.hpp"
36 #include "vmreg_aarch64.inline.hpp"
37 #ifdef COMPILER2
38 #include "opto/runtime.hpp"
39 #endif
40
41 // machine-dependent part of VtableStubs: create VtableStub of correct size and
42 // initialize its code
43
44 #define __ masm->
45
46 #ifndef PRODUCT
47 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
48 #endif
49
50 VtableStub* VtableStubs::create_vtable_stub(int vtable_index, bool caller_is_c1) {
51 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
52 const int stub_code_length = code_size_limit(true);
53 VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index, caller_is_c1);
54 // Can be null if there is no free space in the code cache.
55 if (s == nullptr) {
56 return nullptr;
57 }
58
59 // Count unused bytes in instruction sequences of variable size.
60 // We add them to the computed buffer size in order to avoid
61 // overflow in subsequently generated stubs.
62 address start_pc;
63 int slop_bytes = 0;
64 int slop_delta = 0;
65
66 // No variance was detected in vtable stub sizes. Setting index_dependent_slop == 0 will unveil any deviation from this observation.
67 const int index_dependent_slop = 0;
68 ByteSize entry_offset = caller_is_c1 ? Method::from_compiled_inline_offset() : Method::from_compiled_inline_ro_offset();
69
70 ResourceMark rm;
71 CodeBuffer cb(s->entry_point(), stub_code_length);
72 MacroAssembler* masm = new MacroAssembler(&cb);
73
74 #if (!defined(PRODUCT) && defined(COMPILER2))
75 if (CountCompiledCalls) {
76 __ lea(r16, ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
77 __ increment(Address(r16));
78 }
79 #endif
80
81 // get receiver (need to skip return address on top of stack)
82 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
83
84 // get receiver klass
85 address npe_addr = __ pc();
86 __ load_klass(r16, j_rarg0);
87
88 #ifndef PRODUCT
89 if (DebugVtables) {
103 const ptrdiff_t codesize = __ pc() - start_pc;
104 slop_delta = estimate - codesize; // call_VM varies in length, depending on data
105 slop_bytes += slop_delta;
106 assert(slop_delta >= 0, "vtable #%d: Code size estimate (%d) for DebugVtables too small, required: %d", vtable_index, (int)estimate, (int)codesize);
107
108 __ leave();
109 __ bind(L);
110 }
111 #endif // PRODUCT
112
113 start_pc = __ pc();
114 __ lookup_virtual_method(r16, vtable_index, rmethod);
115 slop_delta = 8 - (int)(__ pc() - start_pc);
116 slop_bytes += slop_delta;
117 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
118
119 #ifndef PRODUCT
120 if (DebugVtables) {
121 Label L;
122 __ cbz(rmethod, L);
123 __ ldr(rscratch1, Address(rmethod, entry_offset));
124 __ cbnz(rscratch1, L);
125 __ stop("Vtable entry is null");
126 __ bind(L);
127 }
128 #endif // PRODUCT
129
130 // r0: receiver klass
131 // rmethod: Method*
132 // r2: receiver
133 address ame_addr = __ pc();
134 __ ldr(rscratch1, Address(rmethod, entry_offset));
135 __ br(rscratch1);
136
137 masm->flush();
138 slop_bytes += index_dependent_slop; // add'l slop for size variance due to large itable offsets
139 bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, index_dependent_slop);
140
141 return s;
142 }
143
144
145 VtableStub* VtableStubs::create_itable_stub(int itable_index, bool caller_is_c1) {
146 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
147 const int stub_code_length = code_size_limit(false);
148 VtableStub* s = new(stub_code_length) VtableStub(false, itable_index, caller_is_c1);
149 // Can be null if there is no free space in the code cache.
150 if (s == nullptr) {
151 return nullptr;
152 }
153
154 // Count unused bytes in instruction sequences of variable size.
155 // We add them to the computed buffer size in order to avoid
156 // overflow in subsequently generated stubs.
157 address start_pc;
158 int slop_bytes = 0;
159 int slop_delta = 0;
160
161 const int index_dependent_slop = (itable_index == 0) ? 4 : // code size change with transition from 8-bit to 32-bit constant (@index == 16).
162 (itable_index < 16) ? 3 : 0; // index == 0 generates even shorter code.
163 ByteSize entry_offset = caller_is_c1 ? Method::from_compiled_inline_offset() : Method::from_compiled_inline_ro_offset();
164
165 ResourceMark rm;
166 CodeBuffer cb(s->entry_point(), stub_code_length);
167 MacroAssembler* masm = new MacroAssembler(&cb);
168
169 #if (!defined(PRODUCT) && defined(COMPILER2))
170 if (CountCompiledCalls) {
171 __ lea(r10, ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
172 __ increment(Address(r10));
173 }
174 #endif
175
176 // get receiver (need to skip return address on top of stack)
177 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
178
179 // Entry arguments:
180 // rscratch2: CompiledICHolder
181 // j_rarg0: Receiver
182
183 // This stub is called from compiled code which has no callee-saved registers,
184 // so all registers except arguments are free at this point.
199 // get receiver klass (also an implicit null-check)
200 address npe_addr = __ pc();
201 __ load_klass(recv_klass_reg, j_rarg0);
202
203 // Receiver subtype check against REFC.
204 // Get selected method from declaring class and itable index
205 __ lookup_interface_method_stub(recv_klass_reg, holder_klass_reg, resolved_klass_reg, rmethod,
206 temp_reg, temp_reg2, itable_index, L_no_such_interface);
207
208 // Reduce "estimate" such that "padding" does not drop below 8.
209 const ptrdiff_t estimate = 124;
210 const ptrdiff_t codesize = __ pc() - start_pc;
211 slop_delta = (int)(estimate - codesize);
212 slop_bytes += slop_delta;
213 assert(slop_delta >= 0, "itable #%d: Code size estimate (%d) for lookup_interface_method too small, required: %d", itable_index, (int)estimate, (int)codesize);
214
215 #ifdef ASSERT
216 if (DebugVtables) {
217 Label L2;
218 __ cbz(rmethod, L2);
219 __ ldr(rscratch1, Address(rmethod, entry_offset));
220 __ cbnz(rscratch1, L2);
221 __ stop("compiler entrypoint is null");
222 __ bind(L2);
223 }
224 #endif // ASSERT
225
226 // rmethod: Method*
227 // j_rarg0: receiver
228 address ame_addr = __ pc();
229 __ ldr(rscratch1, Address(rmethod, entry_offset));
230 __ br(rscratch1);
231
232 __ bind(L_no_such_interface);
233 // Handle IncompatibleClassChangeError in itable stubs.
234 // More detailed error message.
235 // We force resolving of the call site by jumping to the "handle
236 // wrong method" stub, and so let the interpreter runtime do all the
237 // dirty work.
238 assert(SharedRuntime::get_handle_wrong_method_stub() != nullptr, "check initialization order");
239 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
240
241 masm->flush();
242 slop_bytes += index_dependent_slop; // add'l slop for size variance due to large itable offsets
243 bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, index_dependent_slop);
244
245 return s;
246 }
247
248 int VtableStub::pd_code_alignment() {
249 // aarch64 cache line size is not an architected constant. We just align on 4 bytes (instruction size).
250 const unsigned int icache_line_size = 4;
251 return icache_line_size;
252 }
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