| /* |
| * Copyright (c) 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 |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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; |
| |
| /** |
| * Symbol for a regular Java call. This method also creates additional relocations for {@code .plt} |
| * to {@code .got} and {@code .got} to {@code .plt}. |
| */ |
| final class JavaCallSiteRelocationSymbol extends CallSiteRelocationSymbol { |
| |
| private static final byte[] zeroSlot = new byte[8]; |
| // -1 represents Universe::non_oop_word() value |
| 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); |
| } |
| |
| /** |
| * Returns a unique symbol name with the {@code suffix} appended. |
| */ |
| 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); |
| } |
| |
| /** |
| * Add all the required relocations. |
| */ |
| 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) { |
| // Nothing. |
| } else { |
| // For c2i stub we need slot with -1 value. |
| binaryContainer.appendExtLinkageGotBytes(minusOneSlot, 0, minusOneSlot.length); |
| } |
| |
| // Add relocation to GOT cell for call resolution jump. |
| // This GOT cell will be initialized during JVM startup with address |
| // of JVM runtime call resolution function. |
| String gotSymbolName = "got." + getResolveSymbolName(binaryContainer, mi, call); |
| Symbol gotSymbol = binaryContainer.getGotSymbol(gotSymbolName); |
| addExternalPltToGotRelocation(binaryContainer, gotSymbol, stub.getResolveJumpOffset()); |
| |
| // Add relocation to resolve call jump instruction address for GOT cell. |
| // This GOT cell will be initialized with address of resolution jump instruction and |
| // will be updated with call destination address by JVM runtime call resolution code. |
| String pltJmpSymbolName = relocationSymbolName("plt.jmp", mi, call, callSiteRelocation); |
| addCodeContainerRelocation(binaryContainer, pltJmpSymbolName, stub.getResolveJumpStart(), gotStartOffset); |
| |
| // Add relocation to GOT cell for dispatch jump. |
| // The dispatch jump loads destination address from this GOT cell. |
| String gotEntrySymbolName = relocationSymbolName("got.entry", mi, call, callSiteRelocation); |
| addExtLinkageGotContainerRelocation(binaryContainer, gotEntrySymbolName, gotStartOffset, stub.getDispatchJumpOffset()); |
| |
| // Virtual call needs initial -1 value for Klass pointer. |
| // Non virtual call needs initial 0 value for Method pointer to call c2i adapter. |
| byte[] slot = isVirtualCall ? minusOneSlot : zeroSlot; |
| final int gotMetaOffset = binaryContainer.appendExtLinkageGotBytes(slot, 0, slot.length); |
| |
| // Add relocation to GOT cell for move instruction (Klass* for virtual, Method* otherwise). |
| String gotMoveSymbolName = relocationSymbolName("got.move", mi, call, callSiteRelocation); |
| addExtLinkageGotContainerRelocation(binaryContainer, gotMoveSymbolName, gotMetaOffset, stub.getMovOffset()); |
| |
| if (isVirtualCall) { |
| // Nothing. |
| } else { |
| // Add relocation to GOT cell for c2i adapter jump. |
| // The c2i jump instruction loads destination address from this GOT cell. |
| // This GOT cell is initialized with -1 and will be updated |
| // by JVM runtime call resolution code. |
| String gotC2ISymbolName = relocationSymbolName("got.c2i", mi, call, callSiteRelocation); |
| addExtLinkageGotContainerRelocation(binaryContainer, gotC2ISymbolName, gotStartOffset + 8, stub.getC2IJumpOffset()); |
| } |
| } |
| |
| /** |
| * Returns the name of the resolve method for this particular call. |
| */ |
| 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; |
| } |
| |
| } |