Tue, 23 Nov 2010 13:22:55 -0800
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
1 /*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
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 */
25 #include "precompiled.hpp"
26 #include "c1/c1_MacroAssembler.hpp"
27 #include "c1/c1_Runtime1.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "gc_interface/collectedHeap.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "oops/arrayOop.hpp"
32 #include "oops/markOop.hpp"
33 #include "runtime/basicLock.hpp"
34 #include "runtime/biasedLocking.hpp"
35 #include "runtime/os.hpp"
36 #include "runtime/stubRoutines.hpp"
38 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register scratch, Label& slow_case) {
39 const int aligned_mask = BytesPerWord -1;
40 const int hdr_offset = oopDesc::mark_offset_in_bytes();
41 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
42 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
43 Label done;
44 int null_check_offset = -1;
46 verify_oop(obj);
48 // save object being locked into the BasicObjectLock
49 movptr(Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()), obj);
51 if (UseBiasedLocking) {
52 assert(scratch != noreg, "should have scratch register at this point");
53 null_check_offset = biased_locking_enter(disp_hdr, obj, hdr, scratch, false, done, &slow_case);
54 } else {
55 null_check_offset = offset();
56 }
58 // Load object header
59 movptr(hdr, Address(obj, hdr_offset));
60 // and mark it as unlocked
61 orptr(hdr, markOopDesc::unlocked_value);
62 // save unlocked object header into the displaced header location on the stack
63 movptr(Address(disp_hdr, 0), hdr);
64 // test if object header is still the same (i.e. unlocked), and if so, store the
65 // displaced header address in the object header - if it is not the same, get the
66 // object header instead
67 if (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg!
68 cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
69 // if the object header was the same, we're done
70 if (PrintBiasedLockingStatistics) {
71 cond_inc32(Assembler::equal,
72 ExternalAddress((address)BiasedLocking::fast_path_entry_count_addr()));
73 }
74 jcc(Assembler::equal, done);
75 // if the object header was not the same, it is now in the hdr register
76 // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
77 //
78 // 1) (hdr & aligned_mask) == 0
79 // 2) rsp <= hdr
80 // 3) hdr <= rsp + page_size
81 //
82 // these 3 tests can be done by evaluating the following expression:
83 //
84 // (hdr - rsp) & (aligned_mask - page_size)
85 //
86 // assuming both the stack pointer and page_size have their least
87 // significant 2 bits cleared and page_size is a power of 2
88 subptr(hdr, rsp);
89 andptr(hdr, aligned_mask - os::vm_page_size());
90 // for recursive locking, the result is zero => save it in the displaced header
91 // location (NULL in the displaced hdr location indicates recursive locking)
92 movptr(Address(disp_hdr, 0), hdr);
93 // otherwise we don't care about the result and handle locking via runtime call
94 jcc(Assembler::notZero, slow_case);
95 // done
96 bind(done);
97 return null_check_offset;
98 }
101 void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
102 const int aligned_mask = BytesPerWord -1;
103 const int hdr_offset = oopDesc::mark_offset_in_bytes();
104 assert(disp_hdr == rax, "disp_hdr must be rax, for the cmpxchg instruction");
105 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
106 Label done;
108 if (UseBiasedLocking) {
109 // load object
110 movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
111 biased_locking_exit(obj, hdr, done);
112 }
114 // load displaced header
115 movptr(hdr, Address(disp_hdr, 0));
116 // if the loaded hdr is NULL we had recursive locking
117 testptr(hdr, hdr);
118 // if we had recursive locking, we are done
119 jcc(Assembler::zero, done);
120 if (!UseBiasedLocking) {
121 // load object
122 movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
123 }
124 verify_oop(obj);
125 // test if object header is pointing to the displaced header, and if so, restore
126 // the displaced header in the object - if the object header is not pointing to
127 // the displaced header, get the object header instead
128 if (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg!
129 cmpxchgptr(hdr, Address(obj, hdr_offset));
130 // if the object header was not pointing to the displaced header,
131 // we do unlocking via runtime call
132 jcc(Assembler::notEqual, slow_case);
133 // done
134 bind(done);
135 }
138 // Defines obj, preserves var_size_in_bytes
139 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
140 if (UseTLAB) {
141 tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
142 } else {
143 eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
144 }
145 }
148 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
149 assert_different_registers(obj, klass, len);
150 if (UseBiasedLocking && !len->is_valid()) {
151 assert_different_registers(obj, klass, len, t1, t2);
152 movptr(t1, Address(klass, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes()));
153 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
154 } else {
155 // This assumes that all prototype bits fit in an int32_t
156 movptr(Address(obj, oopDesc::mark_offset_in_bytes ()), (int32_t)(intptr_t)markOopDesc::prototype());
157 }
159 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
160 if (len->is_valid()) {
161 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
162 }
163 }
166 // preserves obj, destroys len_in_bytes
167 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {
168 Label done;
169 assert(obj != len_in_bytes && obj != t1 && t1 != len_in_bytes, "registers must be different");
170 assert((hdr_size_in_bytes & (BytesPerWord - 1)) == 0, "header size is not a multiple of BytesPerWord");
171 Register index = len_in_bytes;
172 // index is positive and ptr sized
173 subptr(index, hdr_size_in_bytes);
174 jcc(Assembler::zero, done);
175 // initialize topmost word, divide index by 2, check if odd and test if zero
176 // note: for the remaining code to work, index must be a multiple of BytesPerWord
177 #ifdef ASSERT
178 { Label L;
179 testptr(index, BytesPerWord - 1);
180 jcc(Assembler::zero, L);
181 stop("index is not a multiple of BytesPerWord");
182 bind(L);
183 }
184 #endif
185 xorptr(t1, t1); // use _zero reg to clear memory (shorter code)
186 if (UseIncDec) {
187 shrptr(index, 3); // divide by 8/16 and set carry flag if bit 2 was set
188 } else {
189 shrptr(index, 2); // use 2 instructions to avoid partial flag stall
190 shrptr(index, 1);
191 }
192 #ifndef _LP64
193 // index could have been not a multiple of 8 (i.e., bit 2 was set)
194 { Label even;
195 // note: if index was a multiple of 8, than it cannot
196 // be 0 now otherwise it must have been 0 before
197 // => if it is even, we don't need to check for 0 again
198 jcc(Assembler::carryClear, even);
199 // clear topmost word (no jump needed if conditional assignment would work here)
200 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 0*BytesPerWord), t1);
201 // index could be 0 now, need to check again
202 jcc(Assembler::zero, done);
203 bind(even);
204 }
205 #endif // !_LP64
206 // initialize remaining object fields: rdx is a multiple of 2 now
207 { Label loop;
208 bind(loop);
209 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 1*BytesPerWord), t1);
210 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 2*BytesPerWord), t1);)
211 decrement(index);
212 jcc(Assembler::notZero, loop);
213 }
215 // done
216 bind(done);
217 }
220 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
221 assert(obj == rax, "obj must be in rax, for cmpxchg");
222 assert(obj != t1 && obj != t2 && t1 != t2, "registers must be different"); // XXX really?
223 assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
225 try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
227 initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2);
228 }
230 void C1_MacroAssembler::initialize_object(Register obj, Register klass, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2) {
231 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0,
232 "con_size_in_bytes is not multiple of alignment");
233 const int hdr_size_in_bytes = instanceOopDesc::base_offset_in_bytes();
235 initialize_header(obj, klass, noreg, t1, t2);
237 // clear rest of allocated space
238 const Register t1_zero = t1;
239 const Register index = t2;
240 const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below)
241 if (var_size_in_bytes != noreg) {
242 mov(index, var_size_in_bytes);
243 initialize_body(obj, index, hdr_size_in_bytes, t1_zero);
244 } else if (con_size_in_bytes <= threshold) {
245 // use explicit null stores
246 // code size = 2 + 3*n bytes (n = number of fields to clear)
247 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code)
248 for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord)
249 movptr(Address(obj, i), t1_zero);
250 } else if (con_size_in_bytes > hdr_size_in_bytes) {
251 // use loop to null out the fields
252 // code size = 16 bytes for even n (n = number of fields to clear)
253 // initialize last object field first if odd number of fields
254 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code)
255 movptr(index, (con_size_in_bytes - hdr_size_in_bytes) >> 3);
256 // initialize last object field if constant size is odd
257 if (((con_size_in_bytes - hdr_size_in_bytes) & 4) != 0)
258 movptr(Address(obj, con_size_in_bytes - (1*BytesPerWord)), t1_zero);
259 // initialize remaining object fields: rdx is a multiple of 2
260 { Label loop;
261 bind(loop);
262 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (1*BytesPerWord)),
263 t1_zero);
264 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (2*BytesPerWord)),
265 t1_zero);)
266 decrement(index);
267 jcc(Assembler::notZero, loop);
268 }
269 }
271 if (CURRENT_ENV->dtrace_alloc_probes()) {
272 assert(obj == rax, "must be");
273 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
274 }
276 verify_oop(obj);
277 }
279 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, Address::ScaleFactor f, Register klass, Label& slow_case) {
280 assert(obj == rax, "obj must be in rax, for cmpxchg");
281 assert_different_registers(obj, len, t1, t2, klass);
283 // determine alignment mask
284 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
286 // check for negative or excessive length
287 cmpptr(len, (int32_t)max_array_allocation_length);
288 jcc(Assembler::above, slow_case);
290 const Register arr_size = t2; // okay to be the same
291 // align object end
292 movptr(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask);
293 lea(arr_size, Address(arr_size, len, f));
294 andptr(arr_size, ~MinObjAlignmentInBytesMask);
296 try_allocate(obj, arr_size, 0, t1, t2, slow_case);
298 initialize_header(obj, klass, len, t1, t2);
300 // clear rest of allocated space
301 const Register len_zero = len;
302 initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero);
304 if (CURRENT_ENV->dtrace_alloc_probes()) {
305 assert(obj == rax, "must be");
306 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
307 }
309 verify_oop(obj);
310 }
314 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
315 verify_oop(receiver);
316 // explicit NULL check not needed since load from [klass_offset] causes a trap
317 // check against inline cache
318 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
319 int start_offset = offset();
320 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
321 // if icache check fails, then jump to runtime routine
322 // Note: RECEIVER must still contain the receiver!
323 jump_cc(Assembler::notEqual,
324 RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
325 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
326 assert(offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
327 }
330 void C1_MacroAssembler::build_frame(int frame_size_in_bytes) {
331 // Make sure there is enough stack space for this method's activation.
332 // Note that we do this before doing an enter(). This matches the
333 // ordering of C2's stack overflow check / rsp decrement and allows
334 // the SharedRuntime stack overflow handling to be consistent
335 // between the two compilers.
336 generate_stack_overflow_check(frame_size_in_bytes);
338 push(rbp);
339 #ifdef TIERED
340 // c2 leaves fpu stack dirty. Clean it on entry
341 if (UseSSE < 2 ) {
342 empty_FPU_stack();
343 }
344 #endif // TIERED
345 decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0
346 }
349 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) {
350 increment(rsp, frame_size_in_bytes); // Does not emit code for frame_size == 0
351 pop(rbp);
352 }
355 void C1_MacroAssembler::unverified_entry(Register receiver, Register ic_klass) {
356 if (C1Breakpoint) int3();
357 inline_cache_check(receiver, ic_klass);
358 }
361 void C1_MacroAssembler::verified_entry() {
362 if (C1Breakpoint)int3();
363 // build frame
364 verify_FPU(0, "method_entry");
365 }
368 #ifndef PRODUCT
370 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
371 if (!VerifyOops) return;
372 verify_oop_addr(Address(rsp, stack_offset));
373 }
375 void C1_MacroAssembler::verify_not_null_oop(Register r) {
376 if (!VerifyOops) return;
377 Label not_null;
378 testptr(r, r);
379 jcc(Assembler::notZero, not_null);
380 stop("non-null oop required");
381 bind(not_null);
382 verify_oop(r);
383 }
385 void C1_MacroAssembler::invalidate_registers(bool inv_rax, bool inv_rbx, bool inv_rcx, bool inv_rdx, bool inv_rsi, bool inv_rdi) {
386 #ifdef ASSERT
387 if (inv_rax) movptr(rax, 0xDEAD);
388 if (inv_rbx) movptr(rbx, 0xDEAD);
389 if (inv_rcx) movptr(rcx, 0xDEAD);
390 if (inv_rdx) movptr(rdx, 0xDEAD);
391 if (inv_rsi) movptr(rsi, 0xDEAD);
392 if (inv_rdi) movptr(rdi, 0xDEAD);
393 #endif
394 }
396 #endif // ifndef PRODUCT