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8153439: do not install an empty SpeculationLog in an nmethod

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Reviewed-by: iveresov, twisti
This commit is contained in:
Doug Simon 2016-04-07 08:57:26 -10:00
parent d9c49d2be5
commit 1131e05b66
14 changed files with 104 additions and 70 deletions
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15
hotspot/.mx.jvmci/suite.py
View File

@ -83,6 +83,21 @@ suite = {
"workingSets" : "API,JVMCI",
},
"jdk.vm.ci.code.test" : {
"subDir" : "test/compiler/jvmci",
"sourceDirs" : ["src"],
"dependencies" : [
"mx:JUNIT",
"jdk.vm.ci.amd64",
"jdk.vm.ci.sparc",
"jdk.vm.ci.code",
"jdk.vm.ci.hotspot",
],
"checkstyle" : "jdk.vm.ci.services",
"javaCompliance" : "1.8",
"workingSets" : "API,JVMCI",
},
"jdk.vm.ci.runtime" : {
"subDir" : "src/jdk.vm.ci/share/classes",
"sourceDirs" : ["src"],

4
hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotCodeCacheProvider.java
View File

@ -120,7 +120,9 @@ public class HotSpotCodeCacheProvider implements CodeCacheProvider {
resultInstalledCode = installedCode;
}
int result = runtime.getCompilerToVM().installCode(target, (HotSpotCompiledCode) compiledCode, resultInstalledCode, (HotSpotSpeculationLog) log);
HotSpotSpeculationLog speculationLog = (log != null && log.hasSpeculations()) ? (HotSpotSpeculationLog) log : null;
int result = runtime.getCompilerToVM().installCode(target, (HotSpotCompiledCode) compiledCode, resultInstalledCode, speculationLog);
if (result != config.codeInstallResultOk) {
String resultDesc = config.getCodeInstallResultDescription(result);
if (compiledCode instanceof HotSpotCompiledNmethod) {

7
hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotSpeculationLog.java
View File

@ -38,7 +38,7 @@ public class HotSpotSpeculationLog implements SpeculationLog {
/** All speculations that have been a deoptimization reason. */
private Set<SpeculationReason> failedSpeculations;
/** Strong references to all reasons embededded in the current nmethod. */
/** Strong references to all reasons embedded in the current nmethod. */
private volatile Collection<SpeculationReason> speculations;
@Override
@ -81,4 +81,9 @@ public class HotSpotSpeculationLog implements SpeculationLog {
return HotSpotObjectConstantImpl.forObject(reason);
}
@Override
public synchronized boolean hasSpeculations() {
return speculations != null && !speculations.isEmpty();
}
}

7
hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.meta/src/jdk/vm/ci/meta/SpeculationLog.java
View File

@ -56,4 +56,11 @@ public interface SpeculationLog {
* argument to the deoptimization function.
*/
JavaConstant speculate(SpeculationReason reason);
/**
* Returns if this log has speculations.
*
* @return true if there are speculations, false otherwise
*/
boolean hasSpeculations();
}

11
hotspot/test/compiler/jvmci/code/CodeInstallationTest.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/CodeInstallationTest.java
View File

@ -20,15 +20,19 @@
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package compiler.jvmci.code;
package jdk.vm.ci.code.test;
import java.lang.reflect.Method;
import org.junit.Assert;
import jdk.vm.ci.amd64.AMD64;
import jdk.vm.ci.code.Architecture;
import jdk.vm.ci.code.CodeCacheProvider;
import jdk.vm.ci.code.InstalledCode;
import jdk.vm.ci.code.TargetDescription;
import jdk.vm.ci.code.test.amd64.AMD64TestAssembler;
import jdk.vm.ci.code.test.sparc.SPARCTestAssembler;
import jdk.vm.ci.hotspot.HotSpotCompiledCode;
import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;
import jdk.vm.ci.meta.ConstantReflectionProvider;
@ -37,11 +41,6 @@ import jdk.vm.ci.runtime.JVMCI;
import jdk.vm.ci.runtime.JVMCIBackend;
import jdk.vm.ci.sparc.SPARC;
import org.junit.Assert;
import compiler.jvmci.code.amd64.AMD64TestAssembler;
import compiler.jvmci.code.sparc.SPARCTestAssembler;
/**
* Base class for code installation tests.
*/

6
hotspot/test/compiler/jvmci/code/DataPatchTest.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/DataPatchTest.java
View File

@ -32,10 +32,11 @@
* jdk.vm.ci/jdk.vm.ci.runtime
* jdk.vm.ci/jdk.vm.ci.amd64
* jdk.vm.ci/jdk.vm.ci.sparc
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.jvmci.code.DataPatchTest
* @compile CodeInstallationTest.java DebugInfoTest.java TestAssembler.java amd64/AMD64TestAssembler.java sparc/SPARCTestAssembler.java
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI jdk.vm.ci.code.test.DataPatchTest
*/
package compiler.jvmci.code;
package jdk.vm.ci.code.test;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.code.site.DataSectionReference;
@ -158,7 +159,6 @@ public class DataPatchTest extends CodeInstallationTest {
});
}
public static long getConstSymbol(HotSpotMetaAccessProvider meta) {
HotSpotSymbol symbol = meta.lookupSymbol("java/lang/Object");
return symbol.getMetaspacePointer();

4
hotspot/test/compiler/jvmci/code/DebugInfoTest.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/DebugInfoTest.java
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -20,7 +20,7 @@
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package compiler.jvmci.code;
package jdk.vm.ci.code.test;
import java.lang.reflect.Method;

22
hotspot/test/compiler/jvmci/code/InterpreterFrameSizeTest.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/InterpreterFrameSizeTest.java
View File

@ -33,23 +33,20 @@
* jdk.vm.ci/jdk.vm.ci.amd64
* jdk.vm.ci/jdk.vm.ci.sparc
* @compile CodeInstallationTest.java DebugInfoTest.java TestAssembler.java amd64/AMD64TestAssembler.java sparc/SPARCTestAssembler.java
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.jvmci.code.InterpreterFrameSizeTest
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI jdk.vm.ci.code.test.InterpreterFrameSizeTest
*/
package compiler.jvmci.code;
import java.lang.reflect.Method;
import jdk.vm.ci.code.BytecodeFrame;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.JavaValue;
import jdk.vm.ci.meta.ResolvedJavaMethod;
import jdk.vm.ci.hotspot.HotSpotCodeCacheProvider;
package jdk.vm.ci.code.test;
import org.junit.Assert;
import org.junit.Test;
import jdk.vm.ci.code.BytecodeFrame;
import jdk.vm.ci.hotspot.HotSpotCodeCacheProvider;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.JavaValue;
import jdk.vm.ci.meta.ResolvedJavaMethod;
public class InterpreterFrameSizeTest extends CodeInstallationTest {
HotSpotCodeCacheProvider hotspotCodeCache() {
@ -61,7 +58,7 @@ public class InterpreterFrameSizeTest extends CodeInstallationTest {
try {
hotspotCodeCache().interpreterFrameSize(null);
} catch (NullPointerException npe) {
System.out.println("threw NPE as expected");
// Threw NPE as expected.
return;
}
Assert.fail("expected NullPointerException");
@ -78,7 +75,6 @@ public class InterpreterFrameSizeTest extends CodeInstallationTest {
JavaKind[] slotKinds = new JavaKind[numLocals];
BytecodeFrame frame = new BytecodeFrame(null, resolvedMethod, bci, false, false, values, slotKinds, numLocals, numStack, 0);
int size = hotspotCodeCache().interpreterFrameSize(frame);
System.out.println("Frame size is " + size + " bytes");
if (size <= 0) {
Assert.fail("expected non-zero result");
}

11
hotspot/test/compiler/jvmci/code/SimpleCodeInstallationTest.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/SimpleCodeInstallationTest.java
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -32,15 +32,16 @@
* jdk.vm.ci/jdk.vm.ci.runtime
* jdk.vm.ci/jdk.vm.ci.amd64
* jdk.vm.ci/jdk.vm.ci.sparc
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.jvmci.code.SimpleCodeInstallationTest
* @compile CodeInstallationTest.java DebugInfoTest.java TestAssembler.java amd64/AMD64TestAssembler.java sparc/SPARCTestAssembler.java
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI jdk.vm.ci.code.test.SimpleCodeInstallationTest
*/
package compiler.jvmci.code;
import jdk.vm.ci.code.Register;
package jdk.vm.ci.code.test;
import org.junit.Test;
import jdk.vm.ci.code.Register;
/**
* Test simple code installation.
*/

16
hotspot/test/compiler/jvmci/code/SimpleDebugInfoTest.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/SimpleDebugInfoTest.java
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -32,10 +32,14 @@
* jdk.vm.ci/jdk.vm.ci.runtime
* jdk.vm.ci/jdk.vm.ci.amd64
* jdk.vm.ci/jdk.vm.ci.sparc
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.jvmci.code.SimpleDebugInfoTest
* @compile CodeInstallationTest.java DebugInfoTest.java TestAssembler.java amd64/AMD64TestAssembler.java sparc/SPARCTestAssembler.java
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI jdk.vm.ci.code.test.SimpleDebugInfoTest
*/
package compiler.jvmci.code;
package jdk.vm.ci.code.test;
import org.junit.Assume;
import org.junit.Test;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.hotspot.HotSpotConstant;
@ -45,9 +49,6 @@ import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.ResolvedJavaType;
import jdk.vm.ci.meta.Value;
import org.junit.Assume;
import org.junit.Test;
public class SimpleDebugInfoTest extends DebugInfoTest {
public static int intOnStack() {
@ -99,7 +100,6 @@ public class SimpleDebugInfoTest extends DebugInfoTest {
testIntInLocal(compiler);
}
public static float floatOnStack() {
return 42.0f;
}
@ -149,7 +149,6 @@ public class SimpleDebugInfoTest extends DebugInfoTest {
testFloatInLocal(compiler);
}
public static long longOnStack() {
return 42;
}
@ -202,7 +201,6 @@ public class SimpleDebugInfoTest extends DebugInfoTest {
testLongInLocal(compiler);
}
public static Class<?> objectOnStack() {
return SimpleDebugInfoTest.class;
}

2
hotspot/test/compiler/jvmci/code/TestAssembler.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/TestAssembler.java
View File

@ -21,7 +21,7 @@
* questions.
*/
package compiler.jvmci.code;
package jdk.vm.ci.code.test;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

27
hotspot/test/compiler/jvmci/code/VirtualObjectDebugInfoTest.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/VirtualObjectDebugInfoTest.java
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -32,14 +32,18 @@
* jdk.vm.ci/jdk.vm.ci.runtime
* jdk.vm.ci/jdk.vm.ci.amd64
* jdk.vm.ci/jdk.vm.ci.sparc
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.jvmci.code.VirtualObjectDebugInfoTest
* @compile CodeInstallationTest.java DebugInfoTest.java TestAssembler.java amd64/AMD64TestAssembler.java sparc/SPARCTestAssembler.java
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI jdk.vm.ci.code.test.VirtualObjectDebugInfoTest
*/
package compiler.jvmci.code;
package jdk.vm.ci.code.test;
import java.util.ArrayList;
import java.util.Objects;
import org.junit.Assert;
import org.junit.Test;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.code.VirtualObject;
import jdk.vm.ci.hotspot.HotSpotConstant;
@ -49,9 +53,6 @@ import jdk.vm.ci.meta.JavaValue;
import jdk.vm.ci.meta.ResolvedJavaField;
import jdk.vm.ci.meta.ResolvedJavaType;
import org.junit.Assert;
import org.junit.Test;
public class VirtualObjectDebugInfoTest extends DebugInfoTest {
private static class TestClass {
@ -61,11 +62,11 @@ public class VirtualObjectDebugInfoTest extends DebugInfoTest {
private float floatField;
private Object[] arrayField;
public TestClass() {
TestClass() {
this.longField = 8472;
this.intField = 42;
this.floatField = 3.14f;
this.arrayField = new Object[] { Integer.valueOf(58), this, null, Integer.valueOf(17), "Hello, World!" };
this.arrayField = new Object[]{Integer.valueOf(58), this, null, Integer.valueOf(17), "Hello, World!"};
}
@Override
@ -75,10 +76,7 @@ public class VirtualObjectDebugInfoTest extends DebugInfoTest {
}
TestClass other = (TestClass) o;
if (this.longField != other.longField
|| this.intField != other.intField
|| this.floatField != other.floatField
|| this.arrayField.length != other.arrayField.length) {
if (this.longField != other.longField || this.intField != other.intField || this.floatField != other.floatField || this.arrayField.length != other.arrayField.length) {
return false;
}
@ -95,6 +93,11 @@ public class VirtualObjectDebugInfoTest extends DebugInfoTest {
return true;
}
@Override
public int hashCode() {
return super.hashCode();
}
}
public static TestClass buildObject() {

19
hotspot/test/compiler/jvmci/code/amd64/AMD64TestAssembler.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/amd64/AMD64TestAssembler.java
View File

@ -21,7 +21,7 @@
* questions.
*/
package compiler.jvmci.code.amd64;
package jdk.vm.ci.code.test.amd64;
import jdk.vm.ci.amd64.AMD64;
import jdk.vm.ci.amd64.AMD64Kind;
@ -31,6 +31,7 @@ import jdk.vm.ci.code.Register;
import jdk.vm.ci.code.StackSlot;
import jdk.vm.ci.code.site.ConstantReference;
import jdk.vm.ci.code.site.DataSectionReference;
import jdk.vm.ci.code.test.TestAssembler;
import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
import jdk.vm.ci.hotspot.HotSpotConstant;
import jdk.vm.ci.hotspot.HotSpotForeignCallTarget;
@ -39,8 +40,6 @@ import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.LIRKind;
import jdk.vm.ci.meta.VMConstant;
import compiler.jvmci.code.TestAssembler;
public class AMD64TestAssembler extends TestAssembler {
public AMD64TestAssembler(CodeCacheProvider codeCache) {
@ -161,7 +160,7 @@ public class AMD64TestAssembler extends TestAssembler {
code.emitInt(0xDEADDEAD);
return ret;
} else {
return emitLoadLong(0xDEADDEADDEADDEADl);
return emitLoadLong(0xDEADDEADDEADDEADL);
}
}
@ -195,14 +194,16 @@ public class AMD64TestAssembler extends TestAssembler {
@Override
public StackSlot emitIntToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.value(AMD64Kind.DWORD));
emitModRMMemory(false, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16); // MOV r/m32,r32
// MOV r/m32,r32
emitModRMMemory(false, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16);
return ret;
}
@Override
public StackSlot emitLongToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.value(AMD64Kind.QWORD));
emitModRMMemory(true, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16); // MOV r/m64,r64
// MOV r/m64,r64
emitModRMMemory(true, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16);
return ret;
}
@ -221,14 +222,16 @@ public class AMD64TestAssembler extends TestAssembler {
@Override
public StackSlot emitPointerToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.reference(AMD64Kind.QWORD));
emitModRMMemory(true, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16); // MOV r/m64,r64
// MOV r/m64,r64
emitModRMMemory(true, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16);
return ret;
}
@Override
public StackSlot emitNarrowPointerToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.reference(AMD64Kind.DWORD));
emitModRMMemory(false, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16); // MOV r/m32,r32
// MOV r/m32,r32
emitModRMMemory(false, 0x89, a.encoding, AMD64.rbp.encoding, ret.getRawOffset() + 16);
return ret;
}

23
hotspot/test/compiler/jvmci/code/sparc/SPARCTestAssembler.java → hotspot/test/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/sparc/SPARCTestAssembler.java
View File

@ -21,7 +21,7 @@
* questions.
*/
package compiler.jvmci.code.sparc;
package jdk.vm.ci.code.test.sparc;
import jdk.vm.ci.code.CodeCacheProvider;
import jdk.vm.ci.code.DebugInfo;
@ -29,6 +29,7 @@ import jdk.vm.ci.code.Register;
import jdk.vm.ci.code.StackSlot;
import jdk.vm.ci.code.site.ConstantReference;
import jdk.vm.ci.code.site.DataSectionReference;
import jdk.vm.ci.code.test.TestAssembler;
import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
import jdk.vm.ci.hotspot.HotSpotCompiledCode;
import jdk.vm.ci.hotspot.HotSpotConstant;
@ -41,8 +42,6 @@ import jdk.vm.ci.meta.VMConstant;
import jdk.vm.ci.sparc.SPARC;
import jdk.vm.ci.sparc.SPARCKind;
import compiler.jvmci.code.TestAssembler;
public class SPARCTestAssembler extends TestAssembler {
private static final int MASK13 = (1 << 13) - 1;
@ -69,7 +68,8 @@ public class SPARCTestAssembler extends TestAssembler {
@Override
public void emitPrologue() {
emitOp3(0b10, SPARC.sp, 0b111100, SPARC.sp, -SPARC.REGISTER_SAFE_AREA_SIZE); // SAVE sp, -128, sp
// SAVE sp, -128, sp
emitOp3(0b10, SPARC.sp, 0b111100, SPARC.sp, -SPARC.REGISTER_SAFE_AREA_SIZE);
setDeoptRescueSlot(newStackSlot(LIRKind.value(SPARCKind.XWORD)));
}
@ -195,35 +195,40 @@ public class SPARCTestAssembler extends TestAssembler {
@Override
public StackSlot emitIntToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.value(SPARCKind.WORD));
emitOp3(0b11, a, 0b000100, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS); // STW a, [fp+offset]
// STW a, [fp+offset]
emitOp3(0b11, a, 0b000100, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS);
return ret;
}
@Override
public StackSlot emitLongToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.value(SPARCKind.XWORD));
emitOp3(0b11, a, 0b001110, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS); // STX a, [fp+offset]
// STX a, [fp+offset]
emitOp3(0b11, a, 0b001110, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS);
return ret;
}
@Override
public StackSlot emitFloatToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.value(SPARCKind.SINGLE));
emitOp3(0b11, a, 0b100100, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS); // STF a, [fp+offset]
// STF a, [fp+offset]
emitOp3(0b11, a, 0b100100, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS);
return ret;
}
@Override
public StackSlot emitPointerToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.reference(SPARCKind.XWORD));
emitOp3(0b11, a, 0b001110, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS); // STX a, [fp+offset]
// STX a, [fp+offset]
emitOp3(0b11, a, 0b001110, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS);
return ret;
}
@Override
public StackSlot emitNarrowPointerToStack(Register a) {
StackSlot ret = newStackSlot(LIRKind.reference(SPARCKind.WORD));
emitOp3(0b11, a, 0b000100, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS); // STW a, [fp+offset]
// STW a, [fp+offset]
emitOp3(0b11, a, 0b000100, SPARC.fp, ret.getRawOffset() + SPARC.STACK_BIAS);
return ret;
}