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src/java.base/share/classes/java/lang/invoke/DirectMethodHandle.java
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rev 15427 : 8164483: Generate field lambda forms at link time
Reviewed-by: TBD
@@ -485,26 +485,31 @@
@ForceInline
/*non-public*/ static Object checkCast(Object mh, Object obj) {
return ((DirectMethodHandle) mh).checkCast(obj);
}
+ @ForceInline
+ /*non-public*/ static Unsafe unsafe() {
+ return UNSAFE;
+ }
+
Object checkCast(Object obj) {
return member.getReturnType().cast(obj);
}
// Caching machinery for field accessors:
- private static final byte
+ static final byte
AF_GETFIELD = 0,
AF_PUTFIELD = 1,
AF_GETSTATIC = 2,
AF_PUTSTATIC = 3,
AF_GETSTATIC_INIT = 4,
AF_PUTSTATIC_INIT = 5,
AF_LIMIT = 6;
// Enumerate the different field kinds using Wrapper,
// with an extra case added for checked references.
- private static final int
+ static final int
FT_LAST_WRAPPER = Wrapper.COUNT-1,
FT_UNCHECKED_REF = Wrapper.OBJECT.ordinal(),
FT_CHECKED_REF = FT_LAST_WRAPPER+1,
FT_LIMIT = FT_LAST_WRAPPER+2;
private static int afIndex(byte formOp, boolean isVolatile, int ftypeKind) {
@@ -513,11 +518,11 @@
+ ftypeKind);
}
@Stable
private static final LambdaForm[] ACCESSOR_FORMS
= new LambdaForm[afIndex(AF_LIMIT, false, 0)];
- private static int ftypeKind(Class<?> ftype) {
+ static int ftypeKind(Class<?> ftype) {
if (ftype.isPrimitive())
return Wrapper.forPrimitiveType(ftype).ordinal();
else if (VerifyType.isNullReferenceConversion(Object.class, ftype))
return FT_UNCHECKED_REF;
else
@@ -564,38 +569,85 @@
return lform;
}
private static final Wrapper[] ALL_WRAPPERS = Wrapper.values();
- private static LambdaForm makePreparedFieldLambdaForm(byte formOp, boolean isVolatile, int ftypeKind) {
+ private static Kind getFieldKind(boolean isGetter, boolean isVolatile, Wrapper wrapper) {
+ if (isGetter) {
+ if (isVolatile) {
+ switch (wrapper) {
+ case BOOLEAN: return GET_BOOLEAN_VOLATILE;
+ case BYTE: return GET_BYTE_VOLATILE;
+ case SHORT: return GET_SHORT_VOLATILE;
+ case CHAR: return GET_CHAR_VOLATILE;
+ case INT: return GET_INT_VOLATILE;
+ case LONG: return GET_LONG_VOLATILE;
+ case FLOAT: return GET_FLOAT_VOLATILE;
+ case DOUBLE: return GET_DOUBLE_VOLATILE;
+ case OBJECT: return GET_OBJECT_VOLATILE;
+ }
+ } else {
+ switch (wrapper) {
+ case BOOLEAN: return GET_BOOLEAN;
+ case BYTE: return GET_BYTE;
+ case SHORT: return GET_SHORT;
+ case CHAR: return GET_CHAR;
+ case INT: return GET_INT;
+ case LONG: return GET_LONG;
+ case FLOAT: return GET_FLOAT;
+ case DOUBLE: return GET_DOUBLE;
+ case OBJECT: return GET_OBJECT;
+ }
+ }
+ } else {
+ if (isVolatile) {
+ switch (wrapper) {
+ case BOOLEAN: return PUT_BOOLEAN_VOLATILE;
+ case BYTE: return PUT_BYTE_VOLATILE;
+ case SHORT: return PUT_SHORT_VOLATILE;
+ case CHAR: return PUT_CHAR_VOLATILE;
+ case INT: return PUT_INT_VOLATILE;
+ case LONG: return PUT_LONG_VOLATILE;
+ case FLOAT: return PUT_FLOAT_VOLATILE;
+ case DOUBLE: return PUT_DOUBLE_VOLATILE;
+ case OBJECT: return PUT_OBJECT_VOLATILE;
+ }
+ } else {
+ switch (wrapper) {
+ case BOOLEAN: return PUT_BOOLEAN;
+ case BYTE: return PUT_BYTE;
+ case SHORT: return PUT_SHORT;
+ case CHAR: return PUT_CHAR;
+ case INT: return PUT_INT;
+ case LONG: return PUT_LONG;
+ case FLOAT: return PUT_FLOAT;
+ case DOUBLE: return PUT_DOUBLE;
+ case OBJECT: return PUT_OBJECT;
+ }
+ }
+ }
+ throw new AssertionError("Invalid arguments");
+ }
+
+ static LambdaForm makePreparedFieldLambdaForm(byte formOp, boolean isVolatile, int ftypeKind) {
boolean isGetter = (formOp & 1) == (AF_GETFIELD & 1);
boolean isStatic = (formOp >= AF_GETSTATIC);
boolean needsInit = (formOp >= AF_GETSTATIC_INIT);
boolean needsCast = (ftypeKind == FT_CHECKED_REF);
Wrapper fw = (needsCast ? Wrapper.OBJECT : ALL_WRAPPERS[ftypeKind]);
Class<?> ft = fw.primitiveType();
assert(ftypeKind(needsCast ? String.class : ft) == ftypeKind);
// getObject, putIntVolatile, etc.
- StringBuilder nameBuilder = new StringBuilder();
- if (isGetter) {
- nameBuilder.append("get");
- } else {
- nameBuilder.append("put");
- }
- nameBuilder.append(fw.primitiveSimpleName());
- nameBuilder.setCharAt(3, Character.toUpperCase(nameBuilder.charAt(3)));
- if (isVolatile) {
- nameBuilder.append("Volatile");
- }
+ Kind kind = getFieldKind(isGetter, isVolatile, fw);
MethodType linkerType;
if (isGetter)
linkerType = MethodType.methodType(ft, Object.class, long.class);
else
linkerType = MethodType.methodType(void.class, Object.class, long.class, ft);
- MemberName linker = new MemberName(Unsafe.class, nameBuilder.toString(), linkerType, REF_invokeVirtual);
+ MemberName linker = new MemberName(Unsafe.class, kind.methodName, linkerType, REF_invokeVirtual);
try {
linker = IMPL_NAMES.resolveOrFail(REF_invokeVirtual, linker, null, NoSuchMethodException.class);
} catch (ReflectiveOperationException ex) {
throw newInternalError(ex);
}
@@ -618,10 +670,11 @@
final int SET_VALUE = isGetter ? -1 : ARG_LIMIT - 1;
int nameCursor = ARG_LIMIT;
final int F_HOLDER = (isStatic ? nameCursor++ : -1); // static base if any
final int F_OFFSET = nameCursor++; // Either static offset or field offset.
final int OBJ_CHECK = (OBJ_BASE >= 0 ? nameCursor++ : -1);
+ final int U_HOLDER = nameCursor++; // UNSAFE holder
final int INIT_BAR = (needsInit ? nameCursor++ : -1);
final int PRE_CAST = (needsCast && !isGetter ? nameCursor++ : -1);
final int LINKER_CALL = nameCursor++;
final int POST_CAST = (needsCast && isGetter ? nameCursor++ : -1);
final int RESULT = nameCursor-1; // either the call or the cast
@@ -630,11 +683,11 @@
names[INIT_BAR] = new Name(NF_ensureInitialized, names[DMH_THIS]);
if (needsCast && !isGetter)
names[PRE_CAST] = new Name(NF_checkCast, names[DMH_THIS], names[SET_VALUE]);
Object[] outArgs = new Object[1 + linkerType.parameterCount()];
assert(outArgs.length == (isGetter ? 3 : 4));
- outArgs[0] = UNSAFE;
+ outArgs[0] = names[U_HOLDER] = new Name(NF_unsafe);
if (isStatic) {
outArgs[1] = names[F_HOLDER] = new Name(NF_staticBase, names[DMH_THIS]);
outArgs[2] = names[F_OFFSET] = new Name(NF_staticOffset, names[DMH_THIS]);
} else {
outArgs[1] = names[OBJ_CHECK] = new Name(NF_checkBase, names[OBJ_BASE]);
@@ -648,18 +701,24 @@
if (needsCast && isGetter)
names[POST_CAST] = new Name(NF_checkCast, names[DMH_THIS], names[LINKER_CALL]);
for (Name n : names) assert(n != null);
// add some detail to the lambdaForm debugname,
// significant only for debugging
+ StringBuilder nameBuilder = new StringBuilder(kind.methodName);
if (isStatic) {
nameBuilder.append("Static");
} else {
nameBuilder.append("Field");
}
if (needsCast) nameBuilder.append("Cast");
if (needsInit) nameBuilder.append("Init");
+ if (needsCast || needsInit) {
+ // can't use the pre-generated form when casting and/or initializing
return new LambdaForm(nameBuilder.toString(), ARG_LIMIT, names, RESULT);
+ } else {
+ return new LambdaForm(nameBuilder.toString(), ARG_LIMIT, names, RESULT, kind);
+ }
}
/**
* Pre-initialized NamedFunctions for bootstrapping purposes.
* Factored in an inner class to delay initialization until first usage.
@@ -672,11 +731,12 @@
NF_checkBase,
NF_staticBase,
NF_staticOffset,
NF_checkCast,
NF_allocateInstance,
- NF_constructorMethod;
+ NF_constructorMethod,
+ NF_unsafe;
static {
try {
NamedFunction nfs[] = {
NF_internalMemberName = new NamedFunction(DirectMethodHandle.class
.getDeclaredMethod("internalMemberName", Object.class)),
@@ -695,11 +755,13 @@
NF_checkCast = new NamedFunction(DirectMethodHandle.class
.getDeclaredMethod("checkCast", Object.class, Object.class)),
NF_allocateInstance = new NamedFunction(DirectMethodHandle.class
.getDeclaredMethod("allocateInstance", Object.class)),
NF_constructorMethod = new NamedFunction(DirectMethodHandle.class
- .getDeclaredMethod("constructorMethod", Object.class))
+ .getDeclaredMethod("constructorMethod", Object.class)),
+ NF_unsafe = new NamedFunction(DirectMethodHandle.class
+ .getDeclaredMethod("unsafe"))
};
// Each nf must be statically invocable or we get tied up in our bootstraps.
assert(InvokerBytecodeGenerator.isStaticallyInvocable(nfs));
} catch (ReflectiveOperationException ex) {
throw newInternalError(ex);
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