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comparison: js/src/jit/arm/Trampoline-arm.cpp

js/src/jit/arm/Trampoline-arm.cpp

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1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 * vim: set ts=8 sts=4 et sw=4 tw=99:
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "jscompartment.h"
8
9 #include "assembler/assembler/MacroAssembler.h"
10 #include "jit/arm/BaselineHelpers-arm.h"
11 #include "jit/Bailouts.h"
12 #include "jit/IonFrames.h"
13 #include "jit/IonLinker.h"
14 #include "jit/IonSpewer.h"
15 #include "jit/JitCompartment.h"
16 #ifdef JS_ION_PERF
17 # include "jit/PerfSpewer.h"
18 #endif
19 #include "jit/VMFunctions.h"
20
21 #include "jit/ExecutionMode-inl.h"
22
23 using namespace js;
24 using namespace js::jit;
25
26 static const FloatRegisterSet NonVolatileFloatRegs =
27 FloatRegisterSet((1 << FloatRegisters::d8) |
28 (1 << FloatRegisters::d9) |
29 (1 << FloatRegisters::d10) |
30 (1 << FloatRegisters::d11) |
31 (1 << FloatRegisters::d12) |
32 (1 << FloatRegisters::d13) |
33 (1 << FloatRegisters::d14) |
34 (1 << FloatRegisters::d15));
35
36 static void
37 GenerateReturn(MacroAssembler &masm, int returnCode, SPSProfiler *prof)
38 {
39 // Restore non-volatile floating point registers
40 masm.transferMultipleByRuns(NonVolatileFloatRegs, IsLoad, StackPointer, IA);
41
42 // Unwind the sps mark.
43 masm.spsUnmarkJit(prof, r8);
44
45 // Set up return value
46 masm.ma_mov(Imm32(returnCode), r0);
47
48 // Pop and return
49 masm.startDataTransferM(IsLoad, sp, IA, WriteBack);
50 masm.transferReg(r4);
51 masm.transferReg(r5);
52 masm.transferReg(r6);
53 masm.transferReg(r7);
54 masm.transferReg(r8);
55 masm.transferReg(r9);
56 masm.transferReg(r10);
57 masm.transferReg(r11);
58 // r12 isn't saved, so it shouldn't be restored.
59 masm.transferReg(pc);
60 masm.finishDataTransfer();
61 masm.dumpPool();
62 }
63
64 struct EnterJITStack
65 {
66 double d8;
67 double d9;
68 double d10;
69 double d11;
70 double d12;
71 double d13;
72 double d14;
73 double d15;
74
75 size_t hasSPSMark;
76
77 // non-volatile registers.
78 void *r4;
79 void *r5;
80 void *r6;
81 void *r7;
82 void *r8;
83 void *r9;
84 void *r10;
85 void *r11;
86 // The abi does not expect r12 (ip) to be preserved
87 void *lr;
88
89 // Arguments.
90 // code == r0
91 // argc == r1
92 // argv == r2
93 // frame == r3
94 CalleeToken token;
95 JSObject *scopeChain;
96 size_t numStackValues;
97 Value *vp;
98 };
99
100 /*
101 * This method generates a trampoline for a c++ function with the following
102 * signature:
103 * void enter(void *code, int argc, Value *argv, InterpreterFrame *fp, CalleeToken
104 * calleeToken, JSObject *scopeChain, Value *vp)
105 * ...using standard EABI calling convention
106 */
107 JitCode *
108 JitRuntime::generateEnterJIT(JSContext *cx, EnterJitType type)
109 {
110 const Address slot_token(sp, offsetof(EnterJITStack, token));
111 const Address slot_vp(sp, offsetof(EnterJITStack, vp));
112
113 JS_ASSERT(OsrFrameReg == r3);
114
115 MacroAssembler masm(cx);
116 Assembler *aasm = &masm;
117
118 // Save non-volatile registers. These must be saved by the trampoline,
119 // rather than the JIT'd code, because they are scanned by the conservative
120 // scanner.
121 masm.startDataTransferM(IsStore, sp, DB, WriteBack);
122 masm.transferReg(r4); // [sp,0]
123 masm.transferReg(r5); // [sp,4]
124 masm.transferReg(r6); // [sp,8]
125 masm.transferReg(r7); // [sp,12]
126 masm.transferReg(r8); // [sp,16]
127 masm.transferReg(r9); // [sp,20]
128 masm.transferReg(r10); // [sp,24]
129 masm.transferReg(r11); // [sp,28]
130 // The abi does not expect r12 (ip) to be preserved
131 masm.transferReg(lr); // [sp,32]
132 // The 5th argument is located at [sp, 36]
133 masm.finishDataTransfer();
134
135 // Push the EnterJIT sps mark. "Frame pointer" = start of saved core regs.
136 masm.movePtr(sp, r8);
137 masm.spsMarkJit(&cx->runtime()->spsProfiler, r8, r9);
138
139 // Push the float registers.
140 masm.transferMultipleByRuns(NonVolatileFloatRegs, IsStore, sp, DB);
141
142 // Save stack pointer into r8
143 masm.movePtr(sp, r8);
144
145 // Load calleeToken into r9.
146 masm.loadPtr(slot_token, r9);
147
148 // Save stack pointer.
149 if (type == EnterJitBaseline)
150 masm.movePtr(sp, r11);
151
152 // Load the number of actual arguments into r10.
153 masm.loadPtr(slot_vp, r10);
154 masm.unboxInt32(Address(r10, 0), r10);
155
156 // Subtract off the size of the arguments from the stack pointer, store elsewhere
157 aasm->as_sub(r4, sp, O2RegImmShift(r1, LSL, 3)); //r4 = sp - argc*8
158 // Get the final position of the stack pointer into the stack pointer
159 aasm->as_sub(sp, r4, Imm8(16)); // sp' = sp - argc*8 - 16
160 // Get a copy of the number of args to use as a decrement counter, also
161 // Set the zero condition code
162 aasm->as_mov(r5, O2Reg(r1), SetCond);
163
164 // Loop over arguments, copying them from an unknown buffer onto the Ion
165 // stack so they can be accessed from JIT'ed code.
166 {
167 Label header, footer;
168 // If there aren't any arguments, don't do anything
169 aasm->as_b(&footer, Assembler::Zero);
170 // Get the top of the loop
171 masm.bind(&header);
172 aasm->as_sub(r5, r5, Imm8(1), SetCond);
173 // We could be more awesome, and unroll this, using a loadm
174 // (particularly since the offset is effectively 0)
175 // but that seems more error prone, and complex.
176 // BIG FAT WARNING: this loads both r6 and r7.
177 aasm->as_extdtr(IsLoad, 64, true, PostIndex, r6, EDtrAddr(r2, EDtrOffImm(8)));
178 aasm->as_extdtr(IsStore, 64, true, PostIndex, r6, EDtrAddr(r4, EDtrOffImm(8)));
179 aasm->as_b(&header, Assembler::NonZero);
180 masm.bind(&footer);
181 }
182
183 masm.ma_sub(r8, sp, r8);
184 masm.makeFrameDescriptor(r8, JitFrame_Entry);
185
186 masm.startDataTransferM(IsStore, sp, IB, NoWriteBack);
187 // [sp] = return address (written later)
188 masm.transferReg(r8); // [sp',4] = descriptor, argc*8+20
189 masm.transferReg(r9); // [sp',8] = callee token
190 masm.transferReg(r10); // [sp',12] = actual arguments
191 masm.finishDataTransfer();
192
193 Label returnLabel;
194 if (type == EnterJitBaseline) {
195 // Handle OSR.
196 GeneralRegisterSet regs(GeneralRegisterSet::All());
197 regs.take(JSReturnOperand);
198 regs.takeUnchecked(OsrFrameReg);
199 regs.take(r11);
200 regs.take(ReturnReg);
201
202 const Address slot_numStackValues(r11, offsetof(EnterJITStack, numStackValues));
203
204 Label notOsr;
205 masm.branchTestPtr(Assembler::Zero, OsrFrameReg, OsrFrameReg, &notOsr);
206
207 Register scratch = regs.takeAny();
208
209 Register numStackValues = regs.takeAny();
210 masm.load32(slot_numStackValues, numStackValues);
211
212 // Write return address. On ARM, CodeLabel is only used for tableswitch,
213 // so we can't use it here to get the return address. Instead, we use
214 // pc + a fixed offset to a jump to returnLabel. The pc register holds
215 // pc + 8, so we add the size of 2 instructions to skip the instructions
216 // emitted by storePtr and jump(&skipJump).
217 {
218 AutoForbidPools afp(&masm);
219 Label skipJump;
220 masm.mov(pc, scratch);
221 masm.addPtr(Imm32(2 * sizeof(uint32_t)), scratch);
222 masm.storePtr(scratch, Address(sp, 0));
223 masm.jump(&skipJump);
224 masm.jump(&returnLabel);
225 masm.bind(&skipJump);
226 }
227
228 // Push previous frame pointer.
229 masm.push(r11);
230
231 // Reserve frame.
232 Register framePtr = r11;
233 masm.subPtr(Imm32(BaselineFrame::Size()), sp);
234 masm.mov(sp, framePtr);
235
236 #ifdef XP_WIN
237 // Can't push large frames blindly on windows. Touch frame memory incrementally.
238 masm.ma_lsl(Imm32(3), numStackValues, scratch);
239 masm.subPtr(scratch, framePtr);
240 {
241 masm.ma_sub(sp, Imm32(WINDOWS_BIG_FRAME_TOUCH_INCREMENT), scratch);
242
243 Label touchFrameLoop;
244 Label touchFrameLoopEnd;
245 masm.bind(&touchFrameLoop);
246 masm.branchPtr(Assembler::Below, scratch, framePtr, &touchFrameLoopEnd);
247 masm.store32(Imm32(0), Address(scratch, 0));
248 masm.subPtr(Imm32(WINDOWS_BIG_FRAME_TOUCH_INCREMENT), scratch);
249 masm.jump(&touchFrameLoop);
250 masm.bind(&touchFrameLoopEnd);
251 }
252 masm.mov(sp, framePtr);
253 #endif
254
255 // Reserve space for locals and stack values.
256 masm.ma_lsl(Imm32(3), numStackValues, scratch);
257 masm.ma_sub(sp, scratch, sp);
258
259 // Enter exit frame.
260 masm.addPtr(Imm32(BaselineFrame::Size() + BaselineFrame::FramePointerOffset), scratch);
261 masm.makeFrameDescriptor(scratch, JitFrame_BaselineJS);
262 masm.push(scratch);
263 masm.push(Imm32(0)); // Fake return address.
264 masm.enterFakeExitFrame();
265
266 masm.push(framePtr); // BaselineFrame
267 masm.push(r0); // jitcode
268
269 masm.setupUnalignedABICall(3, scratch);
270 masm.passABIArg(r11); // BaselineFrame
271 masm.passABIArg(OsrFrameReg); // InterpreterFrame
272 masm.passABIArg(numStackValues);
273 masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, jit::InitBaselineFrameForOsr));
274
275 Register jitcode = regs.takeAny();
276 masm.pop(jitcode);
277 masm.pop(framePtr);
278
279 JS_ASSERT(jitcode != ReturnReg);
280
281 Label error;
282 masm.addPtr(Imm32(IonExitFrameLayout::SizeWithFooter()), sp);
283 masm.addPtr(Imm32(BaselineFrame::Size()), framePtr);
284 masm.branchIfFalseBool(ReturnReg, &error);
285
286 masm.jump(jitcode);
287
288 // OOM: load error value, discard return address and previous frame
289 // pointer and return.
290 masm.bind(&error);
291 masm.mov(framePtr, sp);
292 masm.addPtr(Imm32(2 * sizeof(uintptr_t)), sp);
293 masm.moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand);
294 masm.jump(&returnLabel);
295
296 masm.bind(&notOsr);
297 // Load the scope chain in R1.
298 JS_ASSERT(R1.scratchReg() != r0);
299 masm.loadPtr(Address(r11, offsetof(EnterJITStack, scopeChain)), R1.scratchReg());
300 }
301
302 // Call the function.
303 masm.ma_callIonNoPush(r0);
304
305 if (type == EnterJitBaseline) {
306 // Baseline OSR will return here.
307 masm.bind(&returnLabel);
308 }
309
310 // The top of the stack now points to the address of the field following
311 // the return address because the return address is popped for the
312 // return, so we need to remove the size of the return address field.
313 aasm->as_sub(sp, sp, Imm8(4));
314
315 // Load off of the stack the size of our local stack
316 masm.loadPtr(Address(sp, IonJSFrameLayout::offsetOfDescriptor()), r5);
317 aasm->as_add(sp, sp, lsr(r5, FRAMESIZE_SHIFT));
318
319 // Store the returned value into the slot_vp
320 masm.loadPtr(slot_vp, r5);
321 masm.storeValue(JSReturnOperand, Address(r5, 0));
322
323 // :TODO: Optimize storeValue with:
324 // We're using a load-double here. In order for that to work,
325 // the data needs to be stored in two consecutive registers,
326 // make sure this is the case
327 // ASSERT(JSReturnReg_Type.code() == JSReturnReg_Data.code()+1);
328 // aasm->as_extdtr(IsStore, 64, true, Offset,
329 // JSReturnReg_Data, EDtrAddr(r5, EDtrOffImm(0)));
330
331 // Restore non-volatile registers and return.
332 GenerateReturn(masm, true, &cx->runtime()->spsProfiler);
333
334 Linker linker(masm);
335 AutoFlushICache afc("EnterJIT");
336 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
337
338 #ifdef JS_ION_PERF
339 writePerfSpewerJitCodeProfile(code, "EnterJIT");
340 #endif
341
342 return code;
343 }
344
345 JitCode *
346 JitRuntime::generateInvalidator(JSContext *cx)
347 {
348 // See large comment in x86's JitRuntime::generateInvalidator.
349 MacroAssembler masm(cx);
350 //masm.as_bkpt();
351 // At this point, one of two things has happened.
352 // 1) Execution has just returned from C code, which left the stack aligned
353 // 2) Execution has just returned from Ion code, which left the stack unaligned.
354 // The old return address should not matter, but we still want the
355 // stack to be aligned, and there is no good reason to automatically align it with
356 // a call to setupUnalignedABICall.
357 masm.ma_and(Imm32(~7), sp, sp);
358 masm.startDataTransferM(IsStore, sp, DB, WriteBack);
359 // We don't have to push everything, but this is likely easier.
360 // setting regs_
361 for (uint32_t i = 0; i < Registers::Total; i++)
362 masm.transferReg(Register::FromCode(i));
363 masm.finishDataTransfer();
364
365 masm.startFloatTransferM(IsStore, sp, DB, WriteBack);
366 for (uint32_t i = 0; i < FloatRegisters::Total; i++)
367 masm.transferFloatReg(FloatRegister::FromCode(i));
368 masm.finishFloatTransfer();
369
370 masm.ma_mov(sp, r0);
371 const int sizeOfRetval = sizeof(size_t)*2;
372 masm.reserveStack(sizeOfRetval);
373 masm.mov(sp, r1);
374 const int sizeOfBailoutInfo = sizeof(void *)*2;
375 masm.reserveStack(sizeOfBailoutInfo);
376 masm.mov(sp, r2);
377 masm.setupAlignedABICall(3);
378 masm.passABIArg(r0);
379 masm.passABIArg(r1);
380 masm.passABIArg(r2);
381 masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, InvalidationBailout));
382
383 masm.ma_ldr(Address(sp, 0), r2);
384 masm.ma_ldr(Address(sp, sizeOfBailoutInfo), r1);
385 // Remove the return address, the IonScript, the register state
386 // (InvaliationBailoutStack) and the space that was allocated for the return value
387 masm.ma_add(sp, Imm32(sizeof(InvalidationBailoutStack) + sizeOfRetval + sizeOfBailoutInfo), sp);
388 // remove the space that this frame was using before the bailout
389 // (computed by InvalidationBailout)
390 masm.ma_add(sp, r1, sp);
391
392 // Jump to shared bailout tail. The BailoutInfo pointer has to be in r2.
393 JitCode *bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail();
394 masm.branch(bailoutTail);
395
396 Linker linker(masm);
397 AutoFlushICache afc("Invalidator");
398 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
399 IonSpew(IonSpew_Invalidate, " invalidation thunk created at %p", (void *) code->raw());
400
401 #ifdef JS_ION_PERF
402 writePerfSpewerJitCodeProfile(code, "Invalidator");
403 #endif
404
405 return code;
406 }
407
408 JitCode *
409 JitRuntime::generateArgumentsRectifier(JSContext *cx, ExecutionMode mode, void **returnAddrOut)
410 {
411 MacroAssembler masm(cx);
412 // ArgumentsRectifierReg contains the |nargs| pushed onto the current frame.
413 // Including |this|, there are (|nargs| + 1) arguments to copy.
414 JS_ASSERT(ArgumentsRectifierReg == r8);
415
416 // Copy number of actual arguments into r0
417 masm.ma_ldr(DTRAddr(sp, DtrOffImm(IonRectifierFrameLayout::offsetOfNumActualArgs())), r0);
418
419 // Load the number of |undefined|s to push into r6.
420 masm.ma_ldr(DTRAddr(sp, DtrOffImm(IonRectifierFrameLayout::offsetOfCalleeToken())), r1);
421 masm.ma_ldrh(EDtrAddr(r1, EDtrOffImm(JSFunction::offsetOfNargs())), r6);
422
423 masm.ma_sub(r6, r8, r2);
424
425 masm.moveValue(UndefinedValue(), r5, r4);
426
427 masm.ma_mov(sp, r3); // Save %sp.
428 masm.ma_mov(sp, r7); // Save %sp again.
429
430 // Push undefined.
431 {
432 Label undefLoopTop;
433 masm.bind(&undefLoopTop);
434 masm.ma_dataTransferN(IsStore, 64, true, sp, Imm32(-8), r4, PreIndex);
435 masm.ma_sub(r2, Imm32(1), r2, SetCond);
436
437 masm.ma_b(&undefLoopTop, Assembler::NonZero);
438 }
439
440 // Get the topmost argument.
441
442 masm.ma_alu(r3, lsl(r8, 3), r3, op_add); // r3 <- r3 + nargs * 8
443 masm.ma_add(r3, Imm32(sizeof(IonRectifierFrameLayout)), r3);
444
445 // Push arguments, |nargs| + 1 times (to include |this|).
446 {
447 Label copyLoopTop;
448 masm.bind(&copyLoopTop);
449 masm.ma_dataTransferN(IsLoad, 64, true, r3, Imm32(-8), r4, PostIndex);
450 masm.ma_dataTransferN(IsStore, 64, true, sp, Imm32(-8), r4, PreIndex);
451
452 masm.ma_sub(r8, Imm32(1), r8, SetCond);
453 masm.ma_b(&copyLoopTop, Assembler::NotSigned);
454 }
455
456 // translate the framesize from values into bytes
457 masm.ma_add(r6, Imm32(1), r6);
458 masm.ma_lsl(Imm32(3), r6, r6);
459
460 // Construct sizeDescriptor.
461 masm.makeFrameDescriptor(r6, JitFrame_Rectifier);
462
463 // Construct IonJSFrameLayout.
464 masm.ma_push(r0); // actual arguments.
465 masm.ma_push(r1); // callee token
466 masm.ma_push(r6); // frame descriptor.
467
468 // Call the target function.
469 // Note that this code assumes the function is JITted.
470 masm.ma_ldr(DTRAddr(r1, DtrOffImm(JSFunction::offsetOfNativeOrScript())), r3);
471 masm.loadBaselineOrIonRaw(r3, r3, mode, nullptr);
472 masm.ma_callIonHalfPush(r3);
473
474 uint32_t returnOffset = masm.currentOffset();
475
476 // arg1
477 // ...
478 // argN
479 // num actual args
480 // callee token
481 // sizeDescriptor <- sp now
482 // return address
483
484 // Remove the rectifier frame.
485 masm.ma_dtr(IsLoad, sp, Imm32(12), r4, PostIndex);
486
487 // arg1
488 // ...
489 // argN <- sp now; r4 <- frame descriptor
490 // num actual args
491 // callee token
492 // sizeDescriptor
493 // return address
494
495 // Discard pushed arguments.
496 masm.ma_alu(sp, lsr(r4, FRAMESIZE_SHIFT), sp, op_add);
497
498 masm.ret();
499 Linker linker(masm);
500 AutoFlushICache afc("ArgumentsRectifier");
501 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
502
503 CodeOffsetLabel returnLabel(returnOffset);
504 returnLabel.fixup(&masm);
505 if (returnAddrOut)
506 *returnAddrOut = (void *) (code->raw() + returnLabel.offset());
507
508 #ifdef JS_ION_PERF
509 writePerfSpewerJitCodeProfile(code, "ArgumentsRectifier");
510 #endif
511
512 return code;
513 }
514
515 static void
516 GenerateBailoutThunk(JSContext *cx, MacroAssembler &masm, uint32_t frameClass)
517 {
518 // the stack should look like:
519 // [IonFrame]
520 // bailoutFrame.registersnapshot
521 // bailoutFrame.fpsnapshot
522 // bailoutFrame.snapshotOffset
523 // bailoutFrame.frameSize
524
525 // STEP 1a: save our register sets to the stack so Bailout() can
526 // read everything.
527 // sp % 8 == 0
528 masm.startDataTransferM(IsStore, sp, DB, WriteBack);
529 // We don't have to push everything, but this is likely easier.
530 // setting regs_
531 for (uint32_t i = 0; i < Registers::Total; i++)
532 masm.transferReg(Register::FromCode(i));
533 masm.finishDataTransfer();
534
535 masm.startFloatTransferM(IsStore, sp, DB, WriteBack);
536 for (uint32_t i = 0; i < FloatRegisters::Total; i++)
537 masm.transferFloatReg(FloatRegister::FromCode(i));
538 masm.finishFloatTransfer();
539
540 // STEP 1b: Push both the "return address" of the function call (the
541 // address of the instruction after the call that we used to get
542 // here) as well as the callee token onto the stack. The return
543 // address is currently in r14. We will proceed by loading the
544 // callee token into a sacrificial register <= r14, then pushing
545 // both onto the stack
546
547 // now place the frameClass onto the stack, via a register
548 masm.ma_mov(Imm32(frameClass), r4);
549 // And onto the stack. Since the stack is full, we need to put this
550 // one past the end of the current stack. Sadly, the ABI says that we need
551 // to always point to the lowest place that has been written. the OS is
552 // free to do whatever it wants below sp.
553 masm.startDataTransferM(IsStore, sp, DB, WriteBack);
554 // set frameClassId_
555 masm.transferReg(r4);
556 // Set tableOffset_; higher registers are stored at higher locations on
557 // the stack.
558 masm.transferReg(lr);
559 masm.finishDataTransfer();
560
561 // SP % 8 == 4
562 // STEP 1c: Call the bailout function, giving a pointer to the
563 // structure we just blitted onto the stack
564 masm.ma_mov(sp, r0);
565 const int sizeOfBailoutInfo = sizeof(void *)*2;
566 masm.reserveStack(sizeOfBailoutInfo);
567 masm.mov(sp, r1);
568 masm.setupAlignedABICall(2);
569
570 // Decrement sp by another 4, so we keep alignment
571 // Not Anymore! pushing both the snapshotoffset as well as the
572 // masm.as_sub(sp, sp, Imm8(4));
573
574 // Set the old (4-byte aligned) value of the sp as the first argument
575 masm.passABIArg(r0);
576 masm.passABIArg(r1);
577
578 // Sp % 8 == 0
579 masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, Bailout));
580 masm.ma_ldr(Address(sp, 0), r2);
581 masm.ma_add(sp, Imm32(sizeOfBailoutInfo), sp);
582 // Common size of a bailout frame.
583 uint32_t bailoutFrameSize = sizeof(void *) + // frameClass
584 sizeof(double) * FloatRegisters::Total +
585 sizeof(void *) * Registers::Total;
586
587 if (frameClass == NO_FRAME_SIZE_CLASS_ID) {
588 // Make sure the bailout frame size fits into the offset for a load
589 masm.as_dtr(IsLoad, 32, Offset,
590 r4, DTRAddr(sp, DtrOffImm(4)));
591 // used to be: offsetof(BailoutStack, frameSize_)
592 // this structure is no longer available to us :(
593 // We add 12 to the bailoutFrameSize because:
594 // sizeof(uint32_t) for the tableOffset that was pushed onto the stack
595 // sizeof(uintptr_t) for the snapshotOffset;
596 // alignment to round the uintptr_t up to a multiple of 8 bytes.
597 masm.ma_add(sp, Imm32(bailoutFrameSize+12), sp);
598 masm.as_add(sp, sp, O2Reg(r4));
599 } else {
600 uint32_t frameSize = FrameSizeClass::FromClass(frameClass).frameSize();
601 masm.ma_add(Imm32(frameSize // the frame that was added when we entered the most recent function
602 + sizeof(void*) // the size of the "return address" that was dumped on the stack
603 + bailoutFrameSize) // everything else that was pushed on the stack
604 , sp);
605 }
606
607 // Jump to shared bailout tail. The BailoutInfo pointer has to be in r2.
608 JitCode *bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail();
609 masm.branch(bailoutTail);
610 }
611
612 JitCode *
613 JitRuntime::generateBailoutTable(JSContext *cx, uint32_t frameClass)
614 {
615 MacroAssembler masm(cx);
616
617 Label bailout;
618 for (size_t i = 0; i < BAILOUT_TABLE_SIZE; i++)
619 masm.ma_bl(&bailout);
620 masm.bind(&bailout);
621
622 GenerateBailoutThunk(cx, masm, frameClass);
623
624 Linker linker(masm);
625 AutoFlushICache afc("BailoutTable");
626 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
627
628 #ifdef JS_ION_PERF
629 writePerfSpewerJitCodeProfile(code, "BailoutTable");
630 #endif
631
632 return code;
633 }
634
635 JitCode *
636 JitRuntime::generateBailoutHandler(JSContext *cx)
637 {
638 MacroAssembler masm(cx);
639 GenerateBailoutThunk(cx, masm, NO_FRAME_SIZE_CLASS_ID);
640
641 Linker linker(masm);
642 AutoFlushICache afc("BailoutHandler");
643 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
644
645 #ifdef JS_ION_PERF
646 writePerfSpewerJitCodeProfile(code, "BailoutHandler");
647 #endif
648
649 return code;
650 }
651
652 JitCode *
653 JitRuntime::generateVMWrapper(JSContext *cx, const VMFunction &f)
654 {
655 JS_ASSERT(functionWrappers_);
656 JS_ASSERT(functionWrappers_->initialized());
657 VMWrapperMap::AddPtr p = functionWrappers_->lookupForAdd(&f);
658 if (p)
659 return p->value();
660
661 // Generate a separated code for the wrapper.
662 MacroAssembler masm(cx);
663 GeneralRegisterSet regs = GeneralRegisterSet(Register::Codes::WrapperMask);
664
665 // Wrapper register set is a superset of Volatile register set.
666 JS_STATIC_ASSERT((Register::Codes::VolatileMask & ~Register::Codes::WrapperMask) == 0);
667
668 // The context is the first argument; r0 is the first argument register.
669 Register cxreg = r0;
670 regs.take(cxreg);
671
672 // Stack is:
673 // ... frame ...
674 // +8 [args] + argPadding
675 // +0 ExitFrame
676 //
677 // We're aligned to an exit frame, so link it up.
678 masm.enterExitFrameAndLoadContext(&f, cxreg, regs.getAny(), f.executionMode);
679
680 // Save the base of the argument set stored on the stack.
681 Register argsBase = InvalidReg;
682 if (f.explicitArgs) {
683 argsBase = r5;
684 regs.take(argsBase);
685 masm.ma_add(sp, Imm32(IonExitFrameLayout::SizeWithFooter()), argsBase);
686 }
687
688 // Reserve space for the outparameter.
689 Register outReg = InvalidReg;
690 switch (f.outParam) {
691 case Type_Value:
692 outReg = r4;
693 regs.take(outReg);
694 masm.reserveStack(sizeof(Value));
695 masm.ma_mov(sp, outReg);
696 break;
697
698 case Type_Handle:
699 outReg = r4;
700 regs.take(outReg);
701 masm.PushEmptyRooted(f.outParamRootType);
702 masm.ma_mov(sp, outReg);
703 break;
704
705 case Type_Int32:
706 case Type_Pointer:
707 case Type_Bool:
708 outReg = r4;
709 regs.take(outReg);
710 masm.reserveStack(sizeof(int32_t));
711 masm.ma_mov(sp, outReg);
712 break;
713
714 case Type_Double:
715 outReg = r4;
716 regs.take(outReg);
717 masm.reserveStack(sizeof(double));
718 masm.ma_mov(sp, outReg);
719 break;
720
721 default:
722 JS_ASSERT(f.outParam == Type_Void);
723 break;
724 }
725
726 masm.setupUnalignedABICall(f.argc(), regs.getAny());
727 masm.passABIArg(cxreg);
728
729 size_t argDisp = 0;
730
731 // Copy any arguments.
732 for (uint32_t explicitArg = 0; explicitArg < f.explicitArgs; explicitArg++) {
733 MoveOperand from;
734 switch (f.argProperties(explicitArg)) {
735 case VMFunction::WordByValue:
736 masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::GENERAL);
737 argDisp += sizeof(void *);
738 break;
739 case VMFunction::DoubleByValue:
740 // Values should be passed by reference, not by value, so we
741 // assert that the argument is a double-precision float.
742 JS_ASSERT(f.argPassedInFloatReg(explicitArg));
743 masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::DOUBLE);
744 argDisp += sizeof(double);
745 break;
746 case VMFunction::WordByRef:
747 masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS), MoveOp::GENERAL);
748 argDisp += sizeof(void *);
749 break;
750 case VMFunction::DoubleByRef:
751 masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS), MoveOp::GENERAL);
752 argDisp += 2 * sizeof(void *);
753 break;
754 }
755 }
756
757 // Copy the implicit outparam, if any.
758 if (outReg != InvalidReg)
759 masm.passABIArg(outReg);
760
761 masm.callWithABI(f.wrapped);
762
763 // Test for failure.
764 switch (f.failType()) {
765 case Type_Object:
766 masm.branchTestPtr(Assembler::Zero, r0, r0, masm.failureLabel(f.executionMode));
767 break;
768 case Type_Bool:
769 masm.branchIfFalseBool(r0, masm.failureLabel(f.executionMode));
770 break;
771 default:
772 MOZ_ASSUME_UNREACHABLE("unknown failure kind");
773 }
774
775 // Load the outparam and free any allocated stack.
776 switch (f.outParam) {
777 case Type_Handle:
778 masm.popRooted(f.outParamRootType, ReturnReg, JSReturnOperand);
779 break;
780
781 case Type_Value:
782 masm.loadValue(Address(sp, 0), JSReturnOperand);
783 masm.freeStack(sizeof(Value));
784 break;
785
786 case Type_Int32:
787 case Type_Pointer:
788 masm.load32(Address(sp, 0), ReturnReg);
789 masm.freeStack(sizeof(int32_t));
790 break;
791
792 case Type_Bool:
793 masm.load8ZeroExtend(Address(sp, 0), ReturnReg);
794 masm.freeStack(sizeof(int32_t));
795 break;
796
797 case Type_Double:
798 if (cx->runtime()->jitSupportsFloatingPoint)
799 masm.loadDouble(Address(sp, 0), ReturnFloatReg);
800 else
801 masm.assumeUnreachable("Unable to load into float reg, with no FP support.");
802 masm.freeStack(sizeof(double));
803 break;
804
805 default:
806 JS_ASSERT(f.outParam == Type_Void);
807 break;
808 }
809 masm.leaveExitFrame();
810 masm.retn(Imm32(sizeof(IonExitFrameLayout) +
811 f.explicitStackSlots() * sizeof(void *) +
812 f.extraValuesToPop * sizeof(Value)));
813
814 Linker linker(masm);
815 AutoFlushICache afc("VMWrapper");
816 JitCode *wrapper = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
817 if (!wrapper)
818 return nullptr;
819
820 // linker.newCode may trigger a GC and sweep functionWrappers_ so we have to
821 // use relookupOrAdd instead of add.
822 if (!functionWrappers_->relookupOrAdd(p, &f, wrapper))
823 return nullptr;
824
825 #ifdef JS_ION_PERF
826 writePerfSpewerJitCodeProfile(wrapper, "VMWrapper");
827 #endif
828
829 return wrapper;
830 }
831
832 JitCode *
833 JitRuntime::generatePreBarrier(JSContext *cx, MIRType type)
834 {
835 MacroAssembler masm(cx);
836
837 RegisterSet save;
838 if (cx->runtime()->jitSupportsFloatingPoint) {
839 save = RegisterSet(GeneralRegisterSet(Registers::VolatileMask),
840 FloatRegisterSet(FloatRegisters::VolatileMask));
841 } else {
842 save = RegisterSet(GeneralRegisterSet(Registers::VolatileMask),
843 FloatRegisterSet());
844 }
845 masm.PushRegsInMask(save);
846
847 JS_ASSERT(PreBarrierReg == r1);
848 masm.movePtr(ImmPtr(cx->runtime()), r0);
849
850 masm.setupUnalignedABICall(2, r2);
851 masm.passABIArg(r0);
852 masm.passABIArg(r1);
853 if (type == MIRType_Value) {
854 masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, MarkValueFromIon));
855 } else {
856 JS_ASSERT(type == MIRType_Shape);
857 masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, MarkShapeFromIon));
858 }
859
860 masm.PopRegsInMask(save);
861 masm.ret();
862
863 Linker linker(masm);
864 AutoFlushICache afc("PreBarrier");
865 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
866
867 #ifdef JS_ION_PERF
868 writePerfSpewerJitCodeProfile(code, "PreBarrier");
869 #endif
870
871 return code;
872 }
873
874 typedef bool (*HandleDebugTrapFn)(JSContext *, BaselineFrame *, uint8_t *, bool *);
875 static const VMFunction HandleDebugTrapInfo = FunctionInfo<HandleDebugTrapFn>(HandleDebugTrap);
876
877 JitCode *
878 JitRuntime::generateDebugTrapHandler(JSContext *cx)
879 {
880 MacroAssembler masm;
881
882 Register scratch1 = r0;
883 Register scratch2 = r1;
884
885 // Load BaselineFrame pointer in scratch1.
886 masm.mov(r11, scratch1);
887 masm.subPtr(Imm32(BaselineFrame::Size()), scratch1);
888
889 // Enter a stub frame and call the HandleDebugTrap VM function. Ensure
890 // the stub frame has a nullptr ICStub pointer, since this pointer is
891 // marked during GC.
892 masm.movePtr(ImmPtr(nullptr), BaselineStubReg);
893 EmitEnterStubFrame(masm, scratch2);
894
895 JitCode *code = cx->runtime()->jitRuntime()->getVMWrapper(HandleDebugTrapInfo);
896 if (!code)
897 return nullptr;
898
899 masm.push(lr);
900 masm.push(scratch1);
901 EmitCallVM(code, masm);
902
903 EmitLeaveStubFrame(masm);
904
905 // If the stub returns |true|, we have to perform a forced return
906 // (return from the JS frame). If the stub returns |false|, just return
907 // from the trap stub so that execution continues at the current pc.
908 Label forcedReturn;
909 masm.branchTest32(Assembler::NonZero, ReturnReg, ReturnReg, &forcedReturn);
910 masm.mov(lr, pc);
911
912 masm.bind(&forcedReturn);
913 masm.loadValue(Address(r11, BaselineFrame::reverseOffsetOfReturnValue()),
914 JSReturnOperand);
915 masm.mov(r11, sp);
916 masm.pop(r11);
917 masm.ret();
918
919 Linker linker(masm);
920 AutoFlushICache afc("DebugTrapHandler");
921 JitCode *codeDbg = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
922
923 #ifdef JS_ION_PERF
924 writePerfSpewerJitCodeProfile(codeDbg, "DebugTrapHandler");
925 #endif
926
927 return codeDbg;
928 }
929
930 JitCode *
931 JitRuntime::generateExceptionTailStub(JSContext *cx)
932 {
933 MacroAssembler masm;
934
935 masm.handleFailureWithHandlerTail();
936
937 Linker linker(masm);
938 AutoFlushICache afc("ExceptionTailStub");
939 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
940
941 #ifdef JS_ION_PERF
942 writePerfSpewerJitCodeProfile(code, "ExceptionTailStub");
943 #endif
944
945 return code;
946 }
947
948 JitCode *
949 JitRuntime::generateBailoutTailStub(JSContext *cx)
950 {
951 MacroAssembler masm;
952
953 masm.generateBailoutTail(r1, r2);
954
955 Linker linker(masm);
956 AutoFlushICache afc("BailoutTailStub");
957 JitCode *code = linker.newCode<NoGC>(cx, JSC::OTHER_CODE);
958
959 #ifdef JS_ION_PERF
960 writePerfSpewerJitCodeProfile(code, "BailoutTailStub");
961 #endif
962
963 return code;
964 }

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