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AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry for empty methods we emitted something like this if a inline cache is needed: prefix: 00: < IC check > ... 0b: jne <ic_miss_call> 11: nop ... verified_entry: 20: ret ic_miss_call: 21: jmp <entry of runtime function> when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a jump to a stub that handles call-sites that has been made non-entrant. since this jump is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that calls this method via the unverified entry (prefix). the fix is to emit the jump to the runtime function inside the unverfied entry: prefix: 00: < IC check > ... 0b: je <verified_entry> 11: jeq <entry of runtime function> 16: nop ... verified_entry: 20: ret
author Bernhard Urban <bernhard.urban@jku.at>
date Mon, 30 Sep 2013 09:32:18 +0200
parents 35cca763f498
children
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://www.netbeans.org/ns/project/1">
    <type>org.netbeans.modules.apisupport.project</type>
    <configuration>
        <data xmlns="http://www.netbeans.org/ns/nb-module-project/3">
            <code-name-base>com.sun.hotspot.igv.graph</code-name-base>
            <suite-component/>
            <module-dependencies>
                <dependency>
                    <code-name-base>com.sun.hotspot.igv.data</code-name-base>
                    <build-prerequisite/>
                    <compile-dependency/>
                    <run-dependency>
                        <specification-version>1.0</specification-version>
                    </run-dependency>
                </dependency>
                <dependency>
                    <code-name-base>com.sun.hotspot.igv.layout</code-name-base>
                    <build-prerequisite/>
                    <compile-dependency/>
                    <run-dependency>
                        <specification-version>1.0</specification-version>
                    </run-dependency>
                </dependency>
            </module-dependencies>
            <public-packages>
                <package>com.sun.hotspot.igv.graph</package>
                <package>com.sun.hotspot.igv.graph.services</package>
            </public-packages>
        </data>
    </configuration>
</project>