1 /*
2 * Copyright (c) 2013, 2018, 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
24
25 package org.graalvm.compiler.hotspot.sparc;
26
27 import static jdk.vm.ci.code.ValueUtil.asRegister;
28 import static jdk.vm.ci.code.ValueUtil.isRegister;
29 import static jdk.vm.ci.sparc.SPARC.g0;
30 import static jdk.vm.ci.sparc.SPARC.g5;
31 import static jdk.vm.ci.sparc.SPARC.i0;
32 import static jdk.vm.ci.sparc.SPARC.i7;
33 import static jdk.vm.ci.sparc.SPARC.l0;
34 import static jdk.vm.ci.sparc.SPARC.l7;
35 import static jdk.vm.ci.sparc.SPARC.o0;
36 import static jdk.vm.ci.sparc.SPARC.o7;
37 import static jdk.vm.ci.sparc.SPARC.sp;
38 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BPCC;
39 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.isGlobalRegister;
40 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.Annul.NOT_ANNUL;
41 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BranchPredict.PREDICT_NOT_TAKEN;
42 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.CC.Xcc;
43 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.ConditionFlag.NotEqual;
44 import static org.graalvm.compiler.core.common.GraalOptions.ZapStackOnMethodEntry;
45
46 import java.util.ArrayList;
47 import java.util.HashSet;
48 import java.util.Set;
49 import java.util.concurrent.ConcurrentHashMap;
50
51 import jdk.internal.vm.compiler.collections.EconomicMap;
52 import jdk.internal.vm.compiler.collections.EconomicSet;
53 import jdk.internal.vm.compiler.collections.Equivalence;
54 import org.graalvm.compiler.asm.Assembler;
55 import org.graalvm.compiler.asm.Label;
56 import org.graalvm.compiler.asm.sparc.SPARCAddress;
57 import org.graalvm.compiler.asm.sparc.SPARCAssembler;
58 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
59 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler.ScratchRegister;
60 import org.graalvm.compiler.code.CompilationResult;
61 import org.graalvm.compiler.code.DataSection;
62 import org.graalvm.compiler.code.DataSection.Data;
63 import org.graalvm.compiler.core.common.CompilationIdentifier;
64 import org.graalvm.compiler.core.common.alloc.RegisterAllocationConfig;
65 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
66 import org.graalvm.compiler.core.gen.LIRGenerationProvider;
67 import org.graalvm.compiler.core.sparc.SPARCNodeMatchRules;
68 import org.graalvm.compiler.debug.CounterKey;
69 import org.graalvm.compiler.debug.DebugContext;
70 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
71 import org.graalvm.compiler.hotspot.HotSpotDataBuilder;
72 import org.graalvm.compiler.hotspot.HotSpotGraalRuntimeProvider;
73 import org.graalvm.compiler.hotspot.HotSpotHostBackend;
74 import org.graalvm.compiler.hotspot.HotSpotLIRGenerationResult;
75 import org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProvider;
76 import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
77 import org.graalvm.compiler.hotspot.stubs.Stub;
78 import org.graalvm.compiler.lir.InstructionValueConsumer;
79 import org.graalvm.compiler.lir.LIR;
80 import org.graalvm.compiler.lir.LIRFrameState;
81 import org.graalvm.compiler.lir.LIRInstruction;
82 import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
83 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
84 import org.graalvm.compiler.lir.asm.CompilationResultBuilderFactory;
85 import org.graalvm.compiler.lir.asm.DataBuilder;
86 import org.graalvm.compiler.lir.asm.FrameContext;
87 import org.graalvm.compiler.lir.framemap.FrameMap;
88 import org.graalvm.compiler.lir.framemap.FrameMapBuilder;
89 import org.graalvm.compiler.lir.gen.LIRGenerationResult;
90 import org.graalvm.compiler.lir.gen.LIRGeneratorTool;
91 import org.graalvm.compiler.lir.sparc.SPARCCall;
92 import org.graalvm.compiler.lir.sparc.SPARCDelayedControlTransfer;
93 import org.graalvm.compiler.lir.sparc.SPARCFrameMap;
94 import org.graalvm.compiler.lir.sparc.SPARCFrameMapBuilder;
95 import org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin;
96 import org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin.SizeEstimate;
97 import org.graalvm.compiler.lir.sparc.SPARCTailDelayedLIRInstruction;
98 import org.graalvm.compiler.nodes.StructuredGraph;
99 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
100 import org.graalvm.compiler.options.OptionValues;
101
102 import jdk.vm.ci.code.CallingConvention;
103 import jdk.vm.ci.code.Register;
104 import jdk.vm.ci.code.RegisterConfig;
105 import jdk.vm.ci.code.StackSlot;
106 import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
107 import jdk.vm.ci.meta.JavaType;
108 import jdk.vm.ci.meta.ResolvedJavaMethod;
109
110 /**
111 * HotSpot SPARC specific backend.
112 */
113 public class SPARCHotSpotBackend extends HotSpotHostBackend implements LIRGenerationProvider {
114
115 private static final SizeEstimateStatistics CONSTANT_ESTIMATED_STATS = new SizeEstimateStatistics("ESTIMATE");
116 private static final SizeEstimateStatistics CONSTANT_ACTUAL_STATS = new SizeEstimateStatistics("ACTUAL");
117
118 public SPARCHotSpotBackend(GraalHotSpotVMConfig config, HotSpotGraalRuntimeProvider runtime, HotSpotProviders providers) {
119 super(config, runtime, providers);
120 }
121
122 private static class SizeEstimateStatistics {
123 private static final ConcurrentHashMap<String, CounterKey> counters = new ConcurrentHashMap<>();
124 private final String suffix;
125
126 SizeEstimateStatistics(String suffix) {
127 super();
128 this.suffix = suffix;
129 }
130
131 public void add(Class<?> c, int count, DebugContext debug) {
132 String name = SizeEstimateStatistics.class.getSimpleName() + "_" + c.getSimpleName() + "." + suffix;
133 CounterKey m = counters.computeIfAbsent(name, (n) -> DebugContext.counter(n));
134 m.add(debug, count);
135 }
136 }
137
138 private FrameMapBuilder newFrameMapBuilder(RegisterConfig registerConfig) {
139 RegisterConfig registerConfigNonNull = registerConfig == null ? getCodeCache().getRegisterConfig() : registerConfig;
140 FrameMap frameMap = new SPARCFrameMap(getCodeCache(), registerConfigNonNull, this);
141 return new SPARCFrameMapBuilder(frameMap, getCodeCache(), registerConfigNonNull);
142 }
143
144 @Override
145 public LIRGeneratorTool newLIRGenerator(LIRGenerationResult lirGenRes) {
146 return new SPARCHotSpotLIRGenerator(getProviders(), getRuntime().getVMConfig(), lirGenRes);
147 }
148
149 @Override
150 public LIRGenerationResult newLIRGenerationResult(CompilationIdentifier compilationId, LIR lir, RegisterConfig registerConfig, StructuredGraph graph, Object stub) {
151 return new HotSpotLIRGenerationResult(compilationId, lir, newFrameMapBuilder(registerConfig), makeCallingConvention(graph, (Stub) stub), stub,
152 config.requiresReservedStackCheck(graph.getMethods()));
153 }
154
155 @Override
156 public NodeLIRBuilderTool newNodeLIRBuilder(StructuredGraph graph, LIRGeneratorTool lirGen) {
157 return new SPARCHotSpotNodeLIRBuilder(graph, lirGen, new SPARCNodeMatchRules(lirGen));
158 }
159
160 @Override
161 protected void bangStackWithOffset(CompilationResultBuilder crb, int bangOffset) {
162 // Use SPARCAddress to get the final displacement including the stack bias.
163 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
164 SPARCAddress address = new SPARCAddress(sp, -bangOffset);
165 if (SPARCAssembler.isSimm13(address.getDisplacement())) {
166 masm.stx(g0, address);
167 } else {
168 try (ScratchRegister sc = masm.getScratchRegister()) {
169 Register scratch = sc.getRegister();
170 assert isGlobalRegister(scratch) : "Only global (g1-g7) registers are allowed if the frame was not initialized here. Got register " + scratch;
171 masm.setx(address.getDisplacement(), scratch, false);
172 masm.stx(g0, new SPARCAddress(sp, scratch));
173 }
174 }
175 }
176
177 public class HotSpotFrameContext implements FrameContext {
178
179 final boolean isStub;
180
181 HotSpotFrameContext(boolean isStub) {
182 this.isStub = isStub;
183 }
184
185 @Override
186 public boolean hasFrame() {
187 return true;
188 }
189
190 @Override
191 public void enter(CompilationResultBuilder crb) {
192 final int frameSize = crb.frameMap.totalFrameSize();
193 final int stackpointerChange = -frameSize;
194 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
195 if (!isStub) {
196 emitStackOverflowCheck(crb);
197 }
198
199 if (SPARCAssembler.isSimm13(stackpointerChange)) {
200 masm.save(sp, stackpointerChange, sp);
201 } else {
202 try (ScratchRegister sc = masm.getScratchRegister()) {
203 Register scratch = sc.getRegister();
204 assert isGlobalRegister(scratch) : "Only global registers are allowed before save. Got register " + scratch;
205 masm.setx(stackpointerChange, scratch, false);
206 masm.save(sp, scratch, sp);
207 }
208 }
209
210 if (ZapStackOnMethodEntry.getValue(crb.getOptions())) {
211 final int slotSize = 8;
212 for (int i = 0; i < frameSize / slotSize; ++i) {
213 // 0xC1C1C1C1
214 masm.stx(g0, new SPARCAddress(sp, i * slotSize));
215 }
216 }
217 }
218
219 @Override
220 public void leave(CompilationResultBuilder crb) {
221 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
222 masm.restoreWindow();
223 }
224 }
225
226 @Override
227 public CompilationResultBuilder newCompilationResultBuilder(LIRGenerationResult lirGenRes, FrameMap frameMap, CompilationResult compilationResult, CompilationResultBuilderFactory factory) {
228 HotSpotLIRGenerationResult gen = (HotSpotLIRGenerationResult) lirGenRes;
229 LIR lir = gen.getLIR();
230 assert gen.getDeoptimizationRescueSlot() == null || frameMap.frameNeedsAllocating() : "method that can deoptimize must have a frame";
231
232 Stub stub = gen.getStub();
233 Assembler masm = new SPARCMacroAssembler(getTarget());
234 // On SPARC we always use stack frames.
235 HotSpotFrameContext frameContext = new HotSpotFrameContext(stub != null);
236 DataBuilder dataBuilder = new HotSpotDataBuilder(getCodeCache().getTarget());
237 OptionValues options = lir.getOptions();
238 DebugContext debug = lir.getDebug();
239 CompilationResultBuilder crb = factory.createBuilder(getProviders().getCodeCache(), getProviders().getForeignCalls(), frameMap, masm, dataBuilder, frameContext, options, debug,
240 compilationResult, Register.None);
241 crb.setTotalFrameSize(frameMap.totalFrameSize());
242 crb.setMaxInterpreterFrameSize(gen.getMaxInterpreterFrameSize());
243 StackSlot deoptimizationRescueSlot = gen.getDeoptimizationRescueSlot();
244 if (deoptimizationRescueSlot != null && stub == null) {
245 crb.compilationResult.setCustomStackAreaOffset(deoptimizationRescueSlot);
246 }
247
248 if (stub != null) {
249 // Even on sparc we need to save floating point registers
250 EconomicSet<Register> destroyedCallerRegisters = gatherDestroyedCallerRegisters(lir);
251 EconomicMap<LIRFrameState, SaveRegistersOp> calleeSaveInfo = gen.getCalleeSaveInfo();
252 updateStub(stub, destroyedCallerRegisters, calleeSaveInfo, frameMap);
253 }
254 assert registerSizePredictionValidator(crb, debug);
255 return crb;
256 }
257
258 /**
259 * Registers a verifier which checks if the LIRInstructions estimate of constants size is
260 * greater or equal to the actual one.
261 */
262 private static boolean registerSizePredictionValidator(final CompilationResultBuilder crb, DebugContext debug) {
263 /**
264 * Used to hold state between beforeOp and afterOp
265 */
266 class ValidationState {
267 LIRInstruction op;
268 final DebugContext debug;
269 int constantSizeBefore;
270
271 ValidationState(DebugContext debug) {
272 this.debug = debug;
273 }
274
275 public void before(LIRInstruction before) {
276 assert op == null : "LIRInstruction " + op + " no after call received";
277 op = before;
278 constantSizeBefore = calculateDataSectionSize(crb.compilationResult.getDataSection());
279 }
280
281 public void after(LIRInstruction after) {
282 assert after.equals(op) : "Instructions before/after don't match " + op + "/" + after;
283 int constantSizeAfter = calculateDataSectionSize(crb.compilationResult.getDataSection());
284 int actual = constantSizeAfter - constantSizeBefore;
285 if (op instanceof SPARCLIRInstructionMixin) {
286 org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin.SizeEstimate size = ((SPARCLIRInstructionMixin) op).estimateSize();
287 assert size != null : "No size prediction available for op: " + op;
288 Class<?> c = op.getClass();
289 CONSTANT_ESTIMATED_STATS.add(c, size.constantSize, debug);
290 CONSTANT_ACTUAL_STATS.add(c, actual, debug);
291 assert size.constantSize >= actual : "Op " + op + " exceeded estimated constant size; predicted: " + size.constantSize + " actual: " + actual;
292 } else {
293 assert actual == 0 : "Op " + op + " emitted to DataSection without any estimate.";
294 }
295 op = null;
296 constantSizeBefore = 0;
297 }
298 }
299 final ValidationState state = new ValidationState(debug);
300 crb.setOpCallback(op -> state.before(op), op -> state.after(op));
301 return true;
302 }
303
304 private static int calculateDataSectionSize(DataSection ds) {
305 int sum = 0;
306 for (Data d : ds) {
307 sum += d.getSize();
308 }
309 return sum;
310 }
311
312 @Override
313 public void emitCode(CompilationResultBuilder crb, LIR lir, ResolvedJavaMethod installedCodeOwner) {
314 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
315 // TODO: (sa) Fold the two traversals into one
316 stuffDelayedControlTransfers(lir);
317 int constantSize = calculateConstantSize(lir);
318 boolean canUseImmediateConstantLoad = constantSize < (1 << 13);
319 masm.setImmediateConstantLoad(canUseImmediateConstantLoad);
320 FrameMap frameMap = crb.frameMap;
321 RegisterConfig regConfig = frameMap.getRegisterConfig();
322 Label unverifiedStub = installedCodeOwner == null || installedCodeOwner.isStatic() ? null : new Label();
323 for (int i = 0; i < 2; i++) {
324 if (i > 0) {
325 crb.resetForEmittingCode();
326 lir.resetLabels();
327 resetDelayedControlTransfers(lir);
328 }
329
330 // Emit the prefix
331 if (unverifiedStub != null) {
332 crb.recordMark(config.MARKID_UNVERIFIED_ENTRY);
333 // We need to use JavaCall here because we haven't entered the frame yet.
334 CallingConvention cc = regConfig.getCallingConvention(HotSpotCallingConventionType.JavaCall, null, new JavaType[]{getProviders().getMetaAccess().lookupJavaType(Object.class)}, this);
335 Register inlineCacheKlass = g5; // see MacroAssembler::ic_call
336
337 try (ScratchRegister sc = masm.getScratchRegister()) {
338 Register scratch = sc.getRegister();
339 Register receiver = asRegister(cc.getArgument(0));
340 SPARCAddress src = new SPARCAddress(receiver, config.hubOffset);
341
342 masm.ldx(src, scratch);
343 masm.cmp(scratch, inlineCacheKlass);
344 }
345 BPCC.emit(masm, Xcc, NotEqual, NOT_ANNUL, PREDICT_NOT_TAKEN, unverifiedStub);
346 masm.nop(); // delay slot
347 }
348
349 masm.align(config.codeEntryAlignment);
350 crb.recordMark(config.MARKID_OSR_ENTRY);
351 crb.recordMark(config.MARKID_VERIFIED_ENTRY);
352
353 // Emit code for the LIR
354 crb.emit(lir);
355 }
356 profileInstructions(lir, crb);
357
358 HotSpotFrameContext frameContext = (HotSpotFrameContext) crb.frameContext;
359 HotSpotForeignCallsProvider foreignCalls = getProviders().getForeignCalls();
360 if (!frameContext.isStub) {
361 crb.recordMark(config.MARKID_EXCEPTION_HANDLER_ENTRY);
362 SPARCCall.directCall(crb, masm, foreignCalls.lookupForeignCall(EXCEPTION_HANDLER), null, null);
363 crb.recordMark(config.MARKID_DEOPT_HANDLER_ENTRY);
364 SPARCCall.directCall(crb, masm, foreignCalls.lookupForeignCall(DEOPTIMIZATION_HANDLER), null, null);
365 } else {
366 // No need to emit the stubs for entries back into the method since
367 // it has no calls that can cause such "return" entries
368 }
369
370 if (unverifiedStub != null) {
371 masm.bind(unverifiedStub);
372 try (ScratchRegister sc = masm.getScratchRegister()) {
373 Register scratch = sc.getRegister();
374 SPARCCall.indirectJmp(crb, masm, scratch, foreignCalls.lookupForeignCall(IC_MISS_HANDLER));
375 }
376 }
377 masm.peephole();
378 }
379
380 private static int calculateConstantSize(LIR lir) {
381 int size = 0;
382 for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {
383 if (block == null) {
384 continue;
385 }
386 for (LIRInstruction inst : lir.getLIRforBlock(block)) {
387 if (inst instanceof SPARCLIRInstructionMixin) {
388 SizeEstimate pred = ((SPARCLIRInstructionMixin) inst).estimateSize();
389 if (pred != null) {
390 size += pred.constantSize;
391 }
392 }
393 }
394 }
395 return size;
396 }
397
398 private static void resetDelayedControlTransfers(LIR lir) {
399 for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {
400 if (block == null) {
401 continue;
402 }
403 for (LIRInstruction inst : lir.getLIRforBlock(block)) {
404 if (inst instanceof SPARCDelayedControlTransfer) {
405 ((SPARCDelayedControlTransfer) inst).resetState();
406 }
407 }
408 }
409 }
410
411 /**
412 * Fix-up over whole LIR.
413 *
414 * @see #stuffDelayedControlTransfers(LIR, AbstractBlockBase)
415 * @param l
416 */
417 private static void stuffDelayedControlTransfers(LIR l) {
418 for (AbstractBlockBase<?> b : l.codeEmittingOrder()) {
419 if (b != null) {
420 stuffDelayedControlTransfers(l, b);
421 }
422 }
423 }
424
425 /**
426 * Tries to put DelayedControlTransfer instructions and DelayableLIRInstructions together. Also
427 * it tries to move the DelayedLIRInstruction to the DelayedControlTransfer instruction, if
428 * possible.
429 */
430 private static void stuffDelayedControlTransfers(LIR l, AbstractBlockBase<?> block) {
431 ArrayList<LIRInstruction> instructions = l.getLIRforBlock(block);
432 if (instructions.size() >= 2) {
433 LIRDependencyAccumulator acc = new LIRDependencyAccumulator();
434 SPARCDelayedControlTransfer delayedTransfer = null;
435 int delayTransferPosition = -1;
436 for (int i = instructions.size() - 1; i >= 0; i--) {
437 LIRInstruction inst = instructions.get(i);
438 boolean adjacent = delayTransferPosition - i == 1;
439 if (!adjacent || inst.destroysCallerSavedRegisters() || leavesRegisterWindow(inst)) {
440 delayedTransfer = null;
441 }
442 if (inst instanceof SPARCDelayedControlTransfer) {
443 delayedTransfer = (SPARCDelayedControlTransfer) inst;
444 acc.start(inst);
445 delayTransferPosition = i;
446 } else if (delayedTransfer != null) {
447 boolean overlap = acc.add(inst);
448 if (!overlap && inst instanceof SPARCTailDelayedLIRInstruction) {
449 // We have found a non overlapping LIR instruction which can be delayed
450 ((SPARCTailDelayedLIRInstruction) inst).setDelayedControlTransfer(delayedTransfer);
451 delayedTransfer = null;
452 }
453 }
454 }
455 }
456 }
457
458 private static boolean leavesRegisterWindow(LIRInstruction inst) {
459 return inst instanceof SPARCLIRInstructionMixin && ((SPARCLIRInstructionMixin) inst).leavesRegisterWindow();
460 }
461
462 /**
463 * Accumulates inputs/outputs/temp/alive in a set along we walk back the LIRInstructions and
464 * detects, if there is any overlap. In this way LIRInstructions can be detected, which can be
465 * moved nearer to the DelayedControlTransfer instruction.
466 */
467 private static class LIRDependencyAccumulator {
468 private final Set<Object> inputs = new HashSet<>(10);
469 private boolean overlap = false;
470
471 private final InstructionValueConsumer valueConsumer = (instruction, value, mode, flags) -> {
472 Object valueObject = value;
473 if (isRegister(value)) { // Canonicalize registers
474 valueObject = asRegister(value);
475 }
476 if (!inputs.add(valueObject)) {
477 overlap = true;
478 }
479 };
480
481 public void start(LIRInstruction initial) {
482 inputs.clear();
483 overlap = false;
484 initial.visitEachInput(valueConsumer);
485 initial.visitEachTemp(valueConsumer);
486 initial.visitEachAlive(valueConsumer);
487 }
488
489 /**
490 * Adds the inputs of lir instruction to the accumulator and returns, true if there was any
491 * overlap of parameters.
492 *
493 * @param inst
494 * @return true if an overlap was found
495 */
496 public boolean add(LIRInstruction inst) {
497 overlap = false;
498 inst.visitEachOutput(valueConsumer);
499 inst.visitEachTemp(valueConsumer);
500 inst.visitEachInput(valueConsumer);
501 inst.visitEachAlive(valueConsumer);
502 return overlap;
503 }
504 }
505
506 @Override
507 public RegisterAllocationConfig newRegisterAllocationConfig(RegisterConfig registerConfig, String[] allocationRestrictedTo) {
508 RegisterConfig registerConfigNonNull = registerConfig == null ? getCodeCache().getRegisterConfig() : registerConfig;
509 return new SPARCHotSpotRegisterAllocationConfig(registerConfigNonNull, allocationRestrictedTo);
510 }
511
512 @Override
513 public EconomicSet<Register> translateToCallerRegisters(EconomicSet<Register> calleeRegisters) {
514 EconomicSet<Register> callerRegisters = EconomicSet.create(Equivalence.IDENTITY, calleeRegisters.size());
515 for (Register register : calleeRegisters) {
516 if (l0.number <= register.number && register.number <= l7.number) {
517 // do nothing
518 } else if (o0.number <= register.number && register.number <= o7.number) {
519 // do nothing
520 } else if (i0.number <= register.number && register.number <= i7.number) {
521 // translate input to output registers
522 callerRegisters.add(translateInputToOutputRegister(register));
523 } else {
524 callerRegisters.add(register);
525 }
526 }
527 return callerRegisters;
528 }
529
530 private Register translateInputToOutputRegister(Register register) {
531 assert i0.number <= register.number && register.number <= i7.number : "Not an input register " + register;
532 return getTarget().arch.getRegisters().get(o0.number + register.number - i0.number);
533 }
534 }