1 /*
2 * Copyright (c) 2013, 2016, 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 package org.graalvm.compiler.hotspot.sparc;
24
25 import static jdk.vm.ci.code.ValueUtil.asRegister;
26 import static jdk.vm.ci.code.ValueUtil.isRegister;
27 import static jdk.vm.ci.sparc.SPARC.g0;
28 import static jdk.vm.ci.sparc.SPARC.g5;
29 import static jdk.vm.ci.sparc.SPARC.i0;
30 import static jdk.vm.ci.sparc.SPARC.i7;
31 import static jdk.vm.ci.sparc.SPARC.l0;
32 import static jdk.vm.ci.sparc.SPARC.l7;
33 import static jdk.vm.ci.sparc.SPARC.o0;
34 import static jdk.vm.ci.sparc.SPARC.o7;
35 import static jdk.vm.ci.sparc.SPARC.sp;
36 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BPCC;
37 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.isGlobalRegister;
38 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.Annul.NOT_ANNUL;
39 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BranchPredict.PREDICT_NOT_TAKEN;
40 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.CC.Xcc;
41 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.ConditionFlag.NotEqual;
42 import static org.graalvm.compiler.core.common.GraalOptions.ZapStackOnMethodEntry;
43
44 import java.util.ArrayList;
45 import java.util.HashSet;
46 import java.util.Set;
47 import java.util.concurrent.ConcurrentHashMap;
48
49 import org.graalvm.compiler.asm.Assembler;
50 import org.graalvm.compiler.asm.Label;
51 import org.graalvm.compiler.asm.sparc.SPARCAddress;
52 import org.graalvm.compiler.asm.sparc.SPARCAssembler;
53 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
54 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler.ScratchRegister;
55 import org.graalvm.compiler.code.CompilationResult;
56 import org.graalvm.compiler.code.DataSection;
57 import org.graalvm.compiler.code.DataSection.Data;
58 import org.graalvm.compiler.core.common.CompilationIdentifier;
59 import org.graalvm.compiler.core.common.alloc.RegisterAllocationConfig;
60 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
61 import org.graalvm.compiler.core.sparc.SPARCNodeMatchRules;
62 import org.graalvm.compiler.debug.CounterKey;
63 import org.graalvm.compiler.debug.DebugContext;
64 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
65 import org.graalvm.compiler.hotspot.HotSpotDataBuilder;
66 import org.graalvm.compiler.hotspot.HotSpotGraalRuntimeProvider;
67 import org.graalvm.compiler.hotspot.HotSpotHostBackend;
68 import org.graalvm.compiler.hotspot.HotSpotLIRGenerationResult;
69 import org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProvider;
70 import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
71 import org.graalvm.compiler.hotspot.stubs.Stub;
72 import org.graalvm.compiler.lir.InstructionValueConsumer;
73 import org.graalvm.compiler.lir.LIR;
74 import org.graalvm.compiler.lir.LIRFrameState;
75 import org.graalvm.compiler.lir.LIRInstruction;
76 import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
77 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
78 import org.graalvm.compiler.lir.asm.CompilationResultBuilderFactory;
79 import org.graalvm.compiler.lir.asm.DataBuilder;
80 import org.graalvm.compiler.lir.asm.FrameContext;
81 import org.graalvm.compiler.lir.framemap.FrameMap;
82 import org.graalvm.compiler.lir.framemap.FrameMapBuilder;
83 import org.graalvm.compiler.lir.gen.LIRGenerationResult;
84 import org.graalvm.compiler.lir.gen.LIRGeneratorTool;
85 import org.graalvm.compiler.lir.sparc.SPARCCall;
86 import org.graalvm.compiler.lir.sparc.SPARCDelayedControlTransfer;
87 import org.graalvm.compiler.lir.sparc.SPARCFrameMap;
88 import org.graalvm.compiler.lir.sparc.SPARCFrameMapBuilder;
89 import org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin;
90 import org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin.SizeEstimate;
91 import org.graalvm.compiler.lir.sparc.SPARCTailDelayedLIRInstruction;
92 import org.graalvm.compiler.nodes.StructuredGraph;
93 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
94 import org.graalvm.compiler.options.OptionValues;
95 import org.graalvm.util.EconomicMap;
96 import org.graalvm.util.EconomicSet;
97 import org.graalvm.util.Equivalence;
98
99 import jdk.vm.ci.code.CallingConvention;
100 import jdk.vm.ci.code.Register;
101 import jdk.vm.ci.code.RegisterConfig;
102 import jdk.vm.ci.code.StackSlot;
103 import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
104 import jdk.vm.ci.meta.JavaType;
105 import jdk.vm.ci.meta.ResolvedJavaMethod;
106
107 /**
108 * HotSpot SPARC specific backend.
109 */
110 public class SPARCHotSpotBackend extends HotSpotHostBackend {
111
112 private static final SizeEstimateStatistics CONSTANT_ESTIMATED_STATS = new SizeEstimateStatistics("ESTIMATE");
113 private static final SizeEstimateStatistics CONSTANT_ACTUAL_STATS = new SizeEstimateStatistics("ACTUAL");
114
115 public SPARCHotSpotBackend(GraalHotSpotVMConfig config, HotSpotGraalRuntimeProvider runtime, HotSpotProviders providers) {
116 super(config, runtime, providers);
117 }
118
119 private static class SizeEstimateStatistics {
120 private static final ConcurrentHashMap<String, CounterKey> counters = new ConcurrentHashMap<>();
121 private final String suffix;
122
123 SizeEstimateStatistics(String suffix) {
124 super();
125 this.suffix = suffix;
126 }
127
128 public void add(Class<?> c, int count, DebugContext debug) {
129 String name = SizeEstimateStatistics.class.getSimpleName() + "_" + c.getSimpleName() + "." + suffix;
130 CounterKey m = counters.computeIfAbsent(name, (n) -> DebugContext.counter(n));
131 m.add(debug, count);
132 }
133 }
134
135 @Override
136 public FrameMapBuilder newFrameMapBuilder(RegisterConfig registerConfig) {
137 RegisterConfig registerConfigNonNull = registerConfig == null ? getCodeCache().getRegisterConfig() : registerConfig;
138 return new SPARCFrameMapBuilder(newFrameMap(registerConfigNonNull), getCodeCache(), registerConfigNonNull);
139 }
140
141 @Override
142 public FrameMap newFrameMap(RegisterConfig registerConfig) {
143 return new SPARCFrameMap(getCodeCache(), registerConfig, this);
144 }
145
146 @Override
147 public LIRGeneratorTool newLIRGenerator(LIRGenerationResult lirGenRes) {
148 return new SPARCHotSpotLIRGenerator(getProviders(), getRuntime().getVMConfig(), lirGenRes);
149 }
150
151 @Override
152 public LIRGenerationResult newLIRGenerationResult(CompilationIdentifier compilationId, LIR lir, FrameMapBuilder frameMapBuilder, StructuredGraph graph, Object stub) {
153 return new HotSpotLIRGenerationResult(compilationId, lir, frameMapBuilder, makeCallingConvention(graph, (Stub) stub), stub);
154 }
155
156 @Override
157 public NodeLIRBuilderTool newNodeLIRBuilder(StructuredGraph graph, LIRGeneratorTool lirGen) {
158 return new SPARCHotSpotNodeLIRBuilder(graph, lirGen, new SPARCNodeMatchRules(lirGen));
159 }
160
161 @Override
162 protected void bangStackWithOffset(CompilationResultBuilder crb, int bangOffset) {
163 // Use SPARCAddress to get the final displacement including the stack bias.
164 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
165 SPARCAddress address = new SPARCAddress(sp, -bangOffset);
166 if (SPARCAssembler.isSimm13(address.getDisplacement())) {
167 masm.stx(g0, address);
168 } else {
169 try (ScratchRegister sc = masm.getScratchRegister()) {
170 Register scratch = sc.getRegister();
171 assert isGlobalRegister(scratch) : "Only global (g1-g7) registers are allowed if the frame was not initialized here. Got register " + scratch;
172 masm.setx(address.getDisplacement(), scratch, false);
173 masm.stx(g0, new SPARCAddress(sp, scratch));
174 }
175 }
176 }
177
178 public class HotSpotFrameContext implements FrameContext {
179
180 final boolean isStub;
181
182 HotSpotFrameContext(boolean isStub) {
183 this.isStub = isStub;
184 }
185
186 @Override
187 public boolean hasFrame() {
188 return true;
189 }
190
191 @Override
192 public void enter(CompilationResultBuilder crb) {
193 final int frameSize = crb.frameMap.totalFrameSize();
194 final int stackpoinerChange = -frameSize;
195 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
196 emitStackOverflowCheck(crb);
197
198 if (SPARCAssembler.isSimm13(stackpoinerChange)) {
199 masm.save(sp, stackpoinerChange, sp);
200 } else {
201 try (ScratchRegister sc = masm.getScratchRegister()) {
202 Register scratch = sc.getRegister();
203 assert isGlobalRegister(scratch) : "Only global registers are allowed before save. Got register " + scratch;
204 masm.setx(stackpoinerChange, scratch, false);
205 masm.save(sp, scratch, sp);
206 }
207 }
208
209 if (ZapStackOnMethodEntry.getValue(crb.getOptions())) {
210 final int slotSize = 8;
211 for (int i = 0; i < frameSize / slotSize; ++i) {
212 // 0xC1C1C1C1
213 masm.stx(g0, new SPARCAddress(sp, i * slotSize));
214 }
215 }
216 }
217
218 @Override
219 public void leave(CompilationResultBuilder crb) {
220 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
221 masm.restoreWindow();
222 }
223 }
224
225 @Override
226 protected Assembler createAssembler(FrameMap frameMap) {
227 return new SPARCMacroAssembler(getTarget());
228 }
229
230 @Override
231 public CompilationResultBuilder newCompilationResultBuilder(LIRGenerationResult lirGenRes, FrameMap frameMap, CompilationResult compilationResult, CompilationResultBuilderFactory factory) {
232 HotSpotLIRGenerationResult gen = (HotSpotLIRGenerationResult) lirGenRes;
233 LIR lir = gen.getLIR();
234 assert gen.getDeoptimizationRescueSlot() == null || frameMap.frameNeedsAllocating() : "method that can deoptimize must have a frame";
235
236 Stub stub = gen.getStub();
237 Assembler masm = createAssembler(frameMap);
238 // On SPARC we always use stack frames.
239 HotSpotFrameContext frameContext = new HotSpotFrameContext(stub != null);
240 DataBuilder dataBuilder = new HotSpotDataBuilder(getCodeCache().getTarget());
241 OptionValues options = lir.getOptions();
242 DebugContext debug = lir.getDebug();
243 CompilationResultBuilder crb = factory.createBuilder(getProviders().getCodeCache(), getProviders().getForeignCalls(), frameMap, masm, dataBuilder, frameContext, options, debug,
244 compilationResult);
245 crb.setTotalFrameSize(frameMap.totalFrameSize());
246 crb.setMaxInterpreterFrameSize(gen.getMaxInterpreterFrameSize());
247 StackSlot deoptimizationRescueSlot = gen.getDeoptimizationRescueSlot();
248 if (deoptimizationRescueSlot != null && stub == null) {
249 crb.compilationResult.setCustomStackAreaOffset(deoptimizationRescueSlot);
250 }
251
252 if (stub != null) {
253 // Even on sparc we need to save floating point registers
254 EconomicSet<Register> destroyedCallerRegisters = gatherDestroyedCallerRegisters(lir);
255 EconomicMap<LIRFrameState, SaveRegistersOp> calleeSaveInfo = gen.getCalleeSaveInfo();
256 updateStub(stub, destroyedCallerRegisters, calleeSaveInfo, frameMap);
257 }
258 assert registerSizePredictionValidator(crb, debug);
259 return crb;
260 }
261
262 /**
263 * Registers a verifier which checks if the LIRInstructions estimate of constants size is
264 * greater or equal to the actual one.
265 */
266 private static boolean registerSizePredictionValidator(final CompilationResultBuilder crb, DebugContext debug) {
267 /**
268 * Used to hold state between beforeOp and afterOp
269 */
270 class ValidationState {
271 LIRInstruction op;
272 final DebugContext debug;
273 int constantSizeBefore;
274
275 ValidationState(DebugContext debug) {
276 this.debug = debug;
277 }
278
279 public void before(LIRInstruction before) {
280 assert op == null : "LIRInstruction " + op + " no after call received";
281 op = before;
282 constantSizeBefore = calculateDataSectionSize(crb.compilationResult.getDataSection());
283 }
284
285 public void after(LIRInstruction after) {
286 assert after.equals(op) : "Instructions before/after don't match " + op + "/" + after;
287 int constantSizeAfter = calculateDataSectionSize(crb.compilationResult.getDataSection());
288 int actual = constantSizeAfter - constantSizeBefore;
289 if (op instanceof SPARCLIRInstructionMixin) {
290 org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin.SizeEstimate size = ((SPARCLIRInstructionMixin) op).estimateSize();
291 assert size != null : "No size prediction available for op: " + op;
292 Class<?> c = op.getClass();
293 CONSTANT_ESTIMATED_STATS.add(c, size.constantSize, debug);
294 CONSTANT_ACTUAL_STATS.add(c, actual, debug);
295 assert size.constantSize >= actual : "Op " + op + " exceeded estimated constant size; predicted: " + size.constantSize + " actual: " + actual;
296 } else {
297 assert actual == 0 : "Op " + op + " emitted to DataSection without any estimate.";
298 }
299 op = null;
300 constantSizeBefore = 0;
301 }
302 }
303 final ValidationState state = new ValidationState(debug);
304 crb.setOpCallback(op -> state.before(op), op -> state.after(op));
305 return true;
306 }
307
308 private static int calculateDataSectionSize(DataSection ds) {
309 int sum = 0;
310 for (Data d : ds) {
311 sum += d.getSize();
312 }
313 return sum;
314 }
315
316 @Override
317 public void emitCode(CompilationResultBuilder crb, LIR lir, ResolvedJavaMethod installedCodeOwner) {
318 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
319 // TODO: (sa) Fold the two traversals into one
320 stuffDelayedControlTransfers(lir);
321 int constantSize = calculateConstantSize(lir);
322 boolean canUseImmediateConstantLoad = constantSize < (1 << 13);
323 masm.setImmediateConstantLoad(canUseImmediateConstantLoad);
324 FrameMap frameMap = crb.frameMap;
325 RegisterConfig regConfig = frameMap.getRegisterConfig();
326 Label unverifiedStub = installedCodeOwner == null || installedCodeOwner.isStatic() ? null : new Label();
327 for (int i = 0; i < 2; i++) {
328 if (i > 0) {
329 crb.resetForEmittingCode();
330 lir.resetLabels();
331 resetDelayedControlTransfers(lir);
332 }
333
334 // Emit the prefix
335 if (unverifiedStub != null) {
336 crb.recordMark(config.MARKID_UNVERIFIED_ENTRY);
337 // We need to use JavaCall here because we haven't entered the frame yet.
338 CallingConvention cc = regConfig.getCallingConvention(HotSpotCallingConventionType.JavaCall, null, new JavaType[]{getProviders().getMetaAccess().lookupJavaType(Object.class)}, this);
339 Register inlineCacheKlass = g5; // see MacroAssembler::ic_call
340
341 try (ScratchRegister sc = masm.getScratchRegister()) {
342 Register scratch = sc.getRegister();
343 Register receiver = asRegister(cc.getArgument(0));
344 SPARCAddress src = new SPARCAddress(receiver, config.hubOffset);
345
346 masm.ldx(src, scratch);
347 masm.cmp(scratch, inlineCacheKlass);
348 }
349 BPCC.emit(masm, Xcc, NotEqual, NOT_ANNUL, PREDICT_NOT_TAKEN, unverifiedStub);
350 masm.nop(); // delay slot
351 }
352
353 masm.align(config.codeEntryAlignment);
354 crb.recordMark(config.MARKID_OSR_ENTRY);
355 crb.recordMark(config.MARKID_VERIFIED_ENTRY);
356
357 // Emit code for the LIR
358 crb.emit(lir);
359 }
360 profileInstructions(lir, crb);
361
362 HotSpotFrameContext frameContext = (HotSpotFrameContext) crb.frameContext;
363 HotSpotForeignCallsProvider foreignCalls = getProviders().getForeignCalls();
364 if (!frameContext.isStub) {
365 crb.recordMark(config.MARKID_EXCEPTION_HANDLER_ENTRY);
366 SPARCCall.directCall(crb, masm, foreignCalls.lookupForeignCall(EXCEPTION_HANDLER), null, null);
367 crb.recordMark(config.MARKID_DEOPT_HANDLER_ENTRY);
368 SPARCCall.directCall(crb, masm, foreignCalls.lookupForeignCall(DEOPTIMIZATION_HANDLER), null, null);
369 } else {
370 // No need to emit the stubs for entries back into the method since
371 // it has no calls that can cause such "return" entries
372 }
373
374 if (unverifiedStub != null) {
375 masm.bind(unverifiedStub);
376 try (ScratchRegister sc = masm.getScratchRegister()) {
377 Register scratch = sc.getRegister();
378 SPARCCall.indirectJmp(crb, masm, scratch, foreignCalls.lookupForeignCall(IC_MISS_HANDLER));
379 }
380 }
381 masm.peephole();
382 }
383
384 private static int calculateConstantSize(LIR lir) {
385 int size = 0;
386 for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {
387 if (block == null) {
388 continue;
389 }
390 for (LIRInstruction inst : lir.getLIRforBlock(block)) {
391 if (inst instanceof SPARCLIRInstructionMixin) {
392 SizeEstimate pred = ((SPARCLIRInstructionMixin) inst).estimateSize();
393 if (pred != null) {
394 size += pred.constantSize;
395 }
396 }
397 }
398 }
399 return size;
400 }
401
402 private static void resetDelayedControlTransfers(LIR lir) {
403 for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {
404 if (block == null) {
405 continue;
406 }
407 for (LIRInstruction inst : lir.getLIRforBlock(block)) {
408 if (inst instanceof SPARCDelayedControlTransfer) {
409 ((SPARCDelayedControlTransfer) inst).resetState();
410 }
411 }
412 }
413 }
414
415 /**
416 * Fix-up over whole LIR.
417 *
418 * @see #stuffDelayedControlTransfers(LIR, AbstractBlockBase)
419 * @param l
420 */
421 private static void stuffDelayedControlTransfers(LIR l) {
422 for (AbstractBlockBase<?> b : l.codeEmittingOrder()) {
423 if (b != null) {
424 stuffDelayedControlTransfers(l, b);
425 }
426 }
427 }
428
429 /**
430 * Tries to put DelayedControlTransfer instructions and DelayableLIRInstructions together. Also
431 * it tries to move the DelayedLIRInstruction to the DelayedControlTransfer instruction, if
432 * possible.
433 */
434 private static void stuffDelayedControlTransfers(LIR l, AbstractBlockBase<?> block) {
435 ArrayList<LIRInstruction> instructions = l.getLIRforBlock(block);
436 if (instructions.size() >= 2) {
437 LIRDependencyAccumulator acc = new LIRDependencyAccumulator();
438 SPARCDelayedControlTransfer delayedTransfer = null;
439 int delayTransferPosition = -1;
440 for (int i = instructions.size() - 1; i >= 0; i--) {
441 LIRInstruction inst = instructions.get(i);
442 boolean adjacent = delayTransferPosition - i == 1;
443 if (!adjacent || inst.destroysCallerSavedRegisters() || leavesRegisterWindow(inst)) {
444 delayedTransfer = null;
445 }
446 if (inst instanceof SPARCDelayedControlTransfer) {
447 delayedTransfer = (SPARCDelayedControlTransfer) inst;
448 acc.start(inst);
449 delayTransferPosition = i;
450 } else if (delayedTransfer != null) {
451 boolean overlap = acc.add(inst);
452 if (!overlap && inst instanceof SPARCTailDelayedLIRInstruction) {
453 // We have found a non overlapping LIR instruction which can be delayed
454 ((SPARCTailDelayedLIRInstruction) inst).setDelayedControlTransfer(delayedTransfer);
455 delayedTransfer = null;
456 }
457 }
458 }
459 }
460 }
461
462 private static boolean leavesRegisterWindow(LIRInstruction inst) {
463 return inst instanceof SPARCLIRInstructionMixin && ((SPARCLIRInstructionMixin) inst).leavesRegisterWindow();
464 }
465
466 /**
467 * Accumulates inputs/outputs/temp/alive in a set along we walk back the LIRInstructions and
468 * detects, if there is any overlap. In this way LIRInstructions can be detected, which can be
469 * moved nearer to the DelayedControlTransfer instruction.
470 */
471 private static class LIRDependencyAccumulator {
472 private final Set<Object> inputs = new HashSet<>(10);
473 private boolean overlap = false;
474
475 private final InstructionValueConsumer valueConsumer = (instruction, value, mode, flags) -> {
476 Object valueObject = value;
477 if (isRegister(value)) { // Canonicalize registers
478 valueObject = asRegister(value);
479 }
480 if (!inputs.add(valueObject)) {
481 overlap = true;
482 }
483 };
484
485 public void start(LIRInstruction initial) {
486 inputs.clear();
487 overlap = false;
488 initial.visitEachInput(valueConsumer);
489 initial.visitEachTemp(valueConsumer);
490 initial.visitEachAlive(valueConsumer);
491 }
492
493 /**
494 * Adds the inputs of lir instruction to the accumulator and returns, true if there was any
495 * overlap of parameters.
496 *
497 * @param inst
498 * @return true if an overlap was found
499 */
500 public boolean add(LIRInstruction inst) {
501 overlap = false;
502 inst.visitEachOutput(valueConsumer);
503 inst.visitEachTemp(valueConsumer);
504 inst.visitEachInput(valueConsumer);
505 inst.visitEachAlive(valueConsumer);
506 return overlap;
507 }
508 }
509
510 @Override
511 public RegisterAllocationConfig newRegisterAllocationConfig(RegisterConfig registerConfig, String[] allocationRestrictedTo) {
512 RegisterConfig registerConfigNonNull = registerConfig == null ? getCodeCache().getRegisterConfig() : registerConfig;
513 return new SPARCHotSpotRegisterAllocationConfig(registerConfigNonNull, allocationRestrictedTo);
514 }
515
516 @Override
517 public EconomicSet<Register> translateToCallerRegisters(EconomicSet<Register> calleeRegisters) {
518 EconomicSet<Register> callerRegisters = EconomicSet.create(Equivalence.IDENTITY, calleeRegisters.size());
519 for (Register register : calleeRegisters) {
520 if (l0.number <= register.number && register.number <= l7.number) {
521 // do nothing
522 } else if (o0.number <= register.number && register.number <= o7.number) {
523 // do nothing
524 } else if (i0.number <= register.number && register.number <= i7.number) {
525 // translate input to output registers
526 callerRegisters.add(translateInputToOutputRegister(register));
527 } else {
528 callerRegisters.add(register);
529 }
530 }
531 return callerRegisters;
532 }
533
534 private Register translateInputToOutputRegister(Register register) {
535 assert i0.number <= register.number && register.number <= i7.number : "Not an input register " + register;
536 return getTarget().arch.getRegisters().get(o0.number + register.number - i0.number);
537 }
538 }