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package org.graalvm.compiler.truffle.compiler.hotspot.amd64;

import static jdk.vm.ci.hotspot.HotSpotCallingConventionType.JavaCall;

import org.graalvm.compiler.asm.Assembler;
import org.graalvm.compiler.asm.Label;
import org.graalvm.compiler.asm.amd64.AMD64Address;
import org.graalvm.compiler.asm.amd64.AMD64Assembler.ConditionFlag;
import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
import org.graalvm.compiler.code.CompilationResult;
import org.graalvm.compiler.core.common.CompressEncoding;
import org.graalvm.compiler.core.common.spi.CodeGenProviders;
import org.graalvm.compiler.debug.DebugContext;
import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
import org.graalvm.compiler.hotspot.amd64.AMD64HotSpotBackend;
import org.graalvm.compiler.hotspot.meta.HotSpotRegistersProvider;
import org.graalvm.compiler.lir.amd64.AMD64Move;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
import org.graalvm.compiler.lir.asm.CompilationResultBuilderFactory;
import org.graalvm.compiler.lir.asm.DataBuilder;
import org.graalvm.compiler.lir.asm.FrameContext;
import org.graalvm.compiler.lir.framemap.FrameMap;
import org.graalvm.compiler.options.OptionValues;
import org.graalvm.compiler.serviceprovider.ServiceProvider;
import org.graalvm.compiler.truffle.compiler.hotspot.TruffleCallBoundaryInstrumentation;
import org.graalvm.compiler.truffle.compiler.hotspot.TruffleCallBoundaryInstrumentationFactory;

import jdk.vm.ci.amd64.AMD64;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.MetaAccessProvider;

@ServiceProvider(TruffleCallBoundaryInstrumentationFactory.class)
public class AMD64TruffleCallBoundaryInstrumentationFactory extends TruffleCallBoundaryInstrumentationFactory {

    @Override
    public CompilationResultBuilderFactory create(MetaAccessProvider metaAccess, GraalHotSpotVMConfig config, HotSpotRegistersProvider registers) {
        return new TruffleCompilationResultBuilderFactory(metaAccess, config, registers) {

            @Override
            public CompilationResultBuilder createBuilder(CodeGenProviders providers, FrameMap frameMap, Assembler asm, DataBuilder dataBuilder,
                            FrameContext frameContext,
                            OptionValues options, DebugContext debug, CompilationResult compilationResult, Register nullRegister) {
                return new TruffleCallBoundaryInstrumentation(providers, frameMap, asm, dataBuilder, frameContext, options, debug, compilationResult, config, registers) {
                    @Override
                    protected void injectTailCallCode(int installedCodeOffset, int entryPointOffset) {
                        AMD64MacroAssembler masm = (AMD64MacroAssembler) this.asm;
                        Register thisRegister = codeCache.getRegisterConfig().getCallingConventionRegisters(JavaCall, JavaKind.Object).get(0);
                        Register spillRegister = AMD64.r10;
                        Label doProlog = new Label();
                        int pos = masm.position();

                        if (config.useCompressedOops) {
                            // First instruction must be at least 5 bytes long to be safe for
                            // patching
                            masm.movl(spillRegister, new AMD64Address(thisRegister, installedCodeOffset), true);
                            assert masm.position() - pos >= AMD64HotSpotBackend.PATCHED_VERIFIED_ENTRY_POINT_INSTRUCTION_SIZE;
                            CompressEncoding encoding = config.getOopEncoding();
                            Register heapBaseRegister = AMD64Move.UncompressPointerOp.hasBase(options, encoding) ? registers.getHeapBaseRegister() : Register.None;
                            AMD64Move.UncompressPointerOp.emitUncompressCode(masm, spillRegister, encoding.getShift(), heapBaseRegister, true);
                        } else {
                            // First instruction must be at least 5 bytes long to be safe for
                            // patching
                            masm.movq(spillRegister, new AMD64Address(thisRegister, installedCodeOffset), true);
                            assert masm.position() - pos >= AMD64HotSpotBackend.PATCHED_VERIFIED_ENTRY_POINT_INSTRUCTION_SIZE;
                        }
                        masm.movq(spillRegister, new AMD64Address(spillRegister, entryPointOffset));
                        masm.testqAndJcc(spillRegister, spillRegister, ConditionFlag.Equal, doProlog, true);
                        masm.jmp(spillRegister);
                        masm.bind(doProlog);
                    }
                };
            }
        };
    }

    @Override
    public String getArchitecture() {
        return "AMD64";
    }
}