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8303582: Reduce duplication in jdk/java/foreign tests

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Reviewed-by: mcimadamore
This commit is contained in:
Jorn Vernee 2023-03-06 14:52:04 +00:00
parent 8e2014527e
commit dccfe8a2ee
13 changed files with 230 additions and 364 deletions
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42
src/java.base/share/classes/jdk/internal/foreign/Utils.java
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@ -29,17 +29,22 @@ package jdk.internal.foreign;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.SegmentAllocator;
import java.lang.foreign.StructLayout;
import java.lang.foreign.ValueLayout;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.VarHandle;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;
import jdk.internal.access.SharedSecrets;
import jdk.internal.foreign.abi.SharedUtils;
import jdk.internal.vm.annotation.ForceInline;
import sun.invoke.util.Wrapper;
import static java.lang.foreign.ValueLayout.JAVA_BYTE;
/**
@ -199,4 +204,41 @@ public final class Utils {
throw new IllegalArgumentException("Invalid alignment constraint : " + byteAlignment);
}
}
private static long computePadding(long offset, long align) {
boolean isAligned = offset == 0 || offset % align == 0;
if (isAligned) {
return 0;
} else {
long gap = offset % align;
return align - gap;
}
}
/**
* {@return return a struct layout constructed from the given elements, with padding
* computed automatically so that they are naturally aligned}.
*
* @param elements the structs' fields
*/
public static StructLayout computePaddedStructLayout(MemoryLayout... elements) {
long offset = 0L;
List<MemoryLayout> layouts = new ArrayList<>();
long align = 0;
for (MemoryLayout l : elements) {
long padding = computePadding(offset, l.bitAlignment());
if (padding != 0) {
layouts.add(MemoryLayout.paddingLayout(padding));
offset += padding;
}
layouts.add(l);
align = Math.max(align, l.bitAlignment());
offset += l.bitSize();
}
long padding = computePadding(offset, align);
if (padding != 0) {
layouts.add(MemoryLayout.paddingLayout(padding));
}
return MemoryLayout.structLayout(layouts.toArray(MemoryLayout[]::new));
}
}