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package org.graalvm.wasm.api;
import org.graalvm.wasm.exception.Failure;
import org.graalvm.wasm.exception.WasmException;
import org.graalvm.wasm.exception.WasmJsApiException;
import org.graalvm.wasm.memory.UnsafeWasmMemory;
import org.graalvm.wasm.memory.WasmMemory;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
public class Memory extends Dictionary {
private final MemoryDescriptor descriptor;
private final WasmMemory memory;
public Memory(WasmMemory memory) {
this.descriptor = new MemoryDescriptor(memory.pageSize(), memory.maxPageSize());
this.memory = memory;
addMembers(new Object[]{
"descriptor", this.descriptor,
"grow", new Executable(args -> grow((Integer) args[0])),
"buffer", new Executable(args -> new MemoryArrayBuffer(memory)),
});
}
public Memory(Object descriptor) {
this(new UnsafeWasmMemory(initial(descriptor), maximum(descriptor)));
}
private static int initial(Object descriptor) {
try {
return (int) InteropLibrary.getUncached().readMember(descriptor, "initial");
} catch (UnsupportedMessageException | UnknownIdentifierException e) {
throw new WasmJsApiException(WasmJsApiException.Kind.TypeError, "Invalid memory descriptor " + descriptor);
}
}
private static int maximum(Object descriptor) {
try {
return (int) InteropLibrary.getUncached().readMember(descriptor, "maximum");
} catch (UnsupportedMessageException | UnknownIdentifierException e) {
throw new WasmJsApiException(WasmJsApiException.Kind.TypeError, "Invalid memory descriptor " + descriptor);
}
}
public WasmMemory wasmMemory() {
return memory;
}
@TruffleBoundary
private static WasmException rangeError() {
return WasmException.create(Failure.UNSPECIFIED_INTERNAL, "Range error.");
}
private long grow(int delta) {
final long pageSize = memory.pageSize();
if (!memory.grow(delta)) {
throw rangeError();
}
return pageSize;
}
}