package jdk.tools.jaotc;
import jdk.tools.jaotc.binformat.BinaryContainer;
import jdk.tools.jaotc.binformat.Symbol;
import jdk.tools.jaotc.CompiledMethodInfo.StubInformation;
import jdk.vm.ci.code.site.Call;
import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;
final class JavaCallSiteRelocationSymbol extends CallSiteRelocationSymbol {
private static final byte[] zeroSlot = new byte[8];
private static final byte[] minusOneSlot = {-1, -1, -1, -1, -1, -1, -1, -1};
public JavaCallSiteRelocationSymbol(CompiledMethodInfo mi, Call call, CallSiteRelocationInfo callSiteRelocation, BinaryContainer binaryContainer) {
super(createPltEntrySymbol(binaryContainer, mi, call, callSiteRelocation));
StubInformation stub = getStub(mi, call);
addRelocations(mi, stub, binaryContainer, call, callSiteRelocation);
}
private static String relocationSymbolName(String suffix, CompiledMethodInfo mi, Call call, CallSiteRelocationInfo callSiteRelocation) {
return "M" + mi.getCodeId() + "_" + call.pcOffset + "_" + callSiteRelocation.targetSymbol + "_" + suffix;
}
private static Symbol createPltEntrySymbol(BinaryContainer binaryContainer, CompiledMethodInfo mi, Call call, CallSiteRelocationInfo callSiteRelocation) {
String symbolName = relocationSymbolName("plt.entry", mi, call, callSiteRelocation);
StubInformation stub = getStub(mi, call);
return createCodeContainerSymbol(binaryContainer, symbolName, stub.getOffset());
}
private static StubInformation getStub(CompiledMethodInfo mi, Call call) {
HotSpotResolvedJavaMethod callTarget = (HotSpotResolvedJavaMethod) call.target;
String callTargetSymbol = MiscUtils.uniqueMethodName(callTarget) + ".at." + call.pcOffset;
return mi.getStubFor(callTargetSymbol);
}
private static void addRelocations(CompiledMethodInfo mi, StubInformation stub, BinaryContainer binaryContainer, Call call, CallSiteRelocationInfo callSiteRelocation) {
final boolean isVirtualCall = MiscUtils.isVirtualCall(mi, call);
final int gotStartOffset = binaryContainer.appendExtLinkageGotBytes(zeroSlot, 0, zeroSlot.length);
if (isVirtualCall) {
} else {
binaryContainer.appendExtLinkageGotBytes(minusOneSlot, 0, minusOneSlot.length);
}
String gotSymbolName = "got." + getResolveSymbolName(binaryContainer, mi, call);
Symbol gotSymbol = binaryContainer.getGotSymbol(gotSymbolName);
addExternalPltToGotRelocation(binaryContainer, gotSymbol, stub.getResolveJumpOffset());
String pltJmpSymbolName = relocationSymbolName("plt.jmp", mi, call, callSiteRelocation);
addCodeContainerRelocation(binaryContainer, pltJmpSymbolName, stub.getResolveJumpStart(), gotStartOffset);
String gotEntrySymbolName = relocationSymbolName("got.entry", mi, call, callSiteRelocation);
addExtLinkageGotContainerRelocation(binaryContainer, gotEntrySymbolName, gotStartOffset, stub.getDispatchJumpOffset());
byte[] slot = isVirtualCall ? minusOneSlot : zeroSlot;
final int gotMetaOffset = binaryContainer.appendExtLinkageGotBytes(slot, 0, slot.length);
String gotMoveSymbolName = relocationSymbolName("got.move", mi, call, callSiteRelocation);
addExtLinkageGotContainerRelocation(binaryContainer, gotMoveSymbolName, gotMetaOffset, stub.getMovOffset());
if (isVirtualCall) {
} else {
String gotC2ISymbolName = relocationSymbolName("got.c2i", mi, call, callSiteRelocation);
addExtLinkageGotContainerRelocation(binaryContainer, gotC2ISymbolName, gotStartOffset + 8, stub.getC2IJumpOffset());
}
}
private static String getResolveSymbolName(BinaryContainer binaryContainer, CompiledMethodInfo mi, Call call) {
String resolveSymbolName;
if (MiscUtils.isStaticCall(call)) {
resolveSymbolName = binaryContainer.getResolveStaticEntrySymbolName();
} else if (MiscUtils.isSpecialCall(call)) {
resolveSymbolName = binaryContainer.getResolveOptVirtualEntrySymbolName();
} else if (MiscUtils.isOptVirtualCall(mi, call)) {
resolveSymbolName = binaryContainer.getResolveOptVirtualEntrySymbolName();
} else if (MiscUtils.isVirtualCall(mi, call)) {
resolveSymbolName = binaryContainer.getResolveVirtualEntrySymbolName();
} else {
throw new InternalError("Unknown call type in " + mi.asTag() + " @ " + call.pcOffset + " for call" + call.target);
}
return resolveSymbolName;
}
}