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Invoke dynamic your api to hotspot

Boundary
Boundary

InvokeDynamic is a new JVM instruction that allows method calls to be dynamically dispatched at runtime based on the actual object type, enabling just-in-time compilation optimizations for any language by making non-Java call sites visible to the HotSpot JVM compiler. It uses bootstrap methods, call sites holding method handle chains, and switch points to dynamically bind calls based on guard conditions checking the actual object type and rebinding if needed.

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InvokeDynamic Your API for HotSpot Tony Arcieri Boundary October 11th, 2012
Who am I?
Who am I?
Our story begins...
Once upon a time... Java was slow
Anamorphic
Anamorphic StrongTalk
Anamorphic StrongTalk • Optional static typing • Modern garbage collector • JIT compiler
Anamorphic Sun Microsystems StrongTalk Java
Anamorphic Sun Microsystems StrongTalk Java Stolen legacy!
Anamorphic Sun Microsystems StrongTalk Java Stolen legacy!
Anamorphic Sun Microsystems StrongTalk Java Stolen legacy!
Invoke dynamic your api to hotspot
HotSpot
JIT
Just-In-Time Compiler Compile When Code Runs
JIT Spectrum
JIT Spectrum Eager Lazy
JIT Spectrum Eager Lazy V8 CLR HotSpot HiPE
JIT Spectrum Eager Lazy V8 CLR HotSpot HiPE Static Optimizations Runtime Optimizations
HotSpot • C1: Client Compiler • C2: Server Compiler
HotSpot • C1: Client Compiler • C2: Server Compiler • -XX:+TieredCompilation
Mixed Mode Profiling JIT
Start by interpreting JVM “emulates” bytecodes in userspace BYTECODE
Locate “hot spots” Using runtime profiling information BYTECODE
Generate machine code Compile JVM bytecode to native ISA after 10,000 calls 1 1 1 1 1 0 0 0 0 0 1 1 BYTECODE 1 1 1 0 0 0 0 0
Optimizations • Inlining methods • Unrolling loops • Eliding locks • Eliminating dead code • Escape analysis
Optimizations • Inlining methods • Unrolling loops • Eliding locks • Eliminating dead code • Escape analysis
Inlining Combine and optimize across calls Method 1 CALL Method 2
Inlining Combine and optimize across calls Method 1 Method 2
Call Sites Where the magic happens... CALL
Call Sites • Profile data • Monomorphic inline cache • Polymorphic inline cache
“Shapes”
Monomorphic Only one type seen at call site A CALL
Bimorphic Two types seen at call site A CALL B
Polymorphic Many types seen at call site A CALLB C
Megamorphic Too many types seen at call site F D A CALL E G B C
Inlining • Measure invocations and branches • Make an educated guess • Inline the code in question • Back out if we guessed wrong
Deopt • Check invariants at a “safe point” • Did we guess wrong? • Revert optimization and try again
JVM Limitations
Made for Java • InvokeVirtual • InvokeInterface • InvokeStatic • InvokeSpecial
Non-Java call sites are opaque to HotSpot Can’t be inlined Method 1 CALL Method 2
Teach HotSpot? See through non-Java call sites Method 1 CALL Method 2
Inline just like Java Method 1 Method 2
What if it worked for any language?
Even Ruby?
InvokeDynamic
InDy
InDy • JSR-292: “Supporting Dynamically Typed Languages on the Java Platform” • Initial version shipped in Java 7 • Feeds directly into HotSpot in Java 8
New JVM instruction
java.lang.invoke
InvokeDynamic
InvokeDynamic
InvokeDynamic
“User defined data endpoint”
JVM Data Endpoints • Invoke operations • Array element access • Property lookup • And more!
InDy Use Cases • Custom invocation • “Constant” values (e.g. globals, language intrinsics) • Scoped values (e.g. instance variables)
InDy How does it work?
Pieces of InDy • Bootstrap methods • Call sites • Method handles • Switch points
Bootstrap method
Bootstrap method Wire up the call site
Bootstrap method Your own code!
Bootstrap Method • Called the first time each InDy call site is used • Find MethodHandle to dispatch • Return CallSite object
Call Site Replaces InDy instruction in bytecode
Call Site Holds onto a chain of MethodHandles
java.lang.invoke.CallSite • ConstantCallSite: unchangeable • VolatileCallSite: seen coherently across cores • MutableCallSite: may appear different across cores
Any of those can be subclassed
java.lang.invoke.MethodHandle • Directly executable reference to a Java method (i.e. fast-as-Java) • Inlineable by HotSpot • MethodHandles all the way down
Methods are first- class objects
Project Lambda Lambdas for the JVM Coming in Java 8! (Summer 2013)
Guarded Invocation
Guarded Invocation MethodHandle.guardWithTest( ! MethodHandle test, ! MethodHandle target, ! MethodHandle fallback )
fallback can rebind the call site Handle new types as they’re seen
SwitchPoints
SwitchPoints SwitchPoint.guardWithTest( ! MethodHandle target, ! MethodHandle fallback ) SwitchPoint.invalidateAll( ! SwitchPoint[] )
java.lang.invoke.SwitchPoint • Publish events across threads (e.g. blow caches when classes change) • Only event is valid -> invalid • Hooks directly into the HotSpot deoptimizer (no additional branches)
Putting it together
Invocation example CallSite: where the call is taking place
Invocation example CallSite: where the call is taking place SwitchPoint: did the class change?
Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound?
Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound? Target: invoke the target method
Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound? Target: invoke the target method - or - Rebind: lookup new method and rebuild call site
Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound? Target: invoke the target method - or - Rebind: lookup new method and rebuild call site - or - Rebind: lookup potentially changed methods
InDy in the real world
Is it good? To the assembly!
Enabling ASM output java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly
Contrived Ruby code def foo; 1; end def invoker; foo; end i = 0 while i < 10000   invoker   i+=1 end
0x00000001060a1be0: mov %eax,-0x14000(%rsp)   0x00000001060a1be7: push %rbp   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Stack juggling   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Is “self” a Ruby object?   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Same metaclass as before?   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Store Fixnum “1” for return   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Note: inside the “foo” method   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Stack juggling   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Safe point check   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Done!   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
Benchmarks
Invoke dynamic your api to hotspot
Invoke dynamic your api to hotspot
That’s it!
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Invoke dynamic your api to hotspot

  • 1. InvokeDynamic Your API for HotSpot Tony Arcieri Boundary October 11th, 2012
  • 5. Once upon a time... Java was slow
  • 8. Anamorphic StrongTalk • Optional static typing • Modern garbage collector • JIT compiler
  • 9. Anamorphic Sun Microsystems StrongTalk Java
  • 10. Anamorphic Sun Microsystems StrongTalk Java Stolen legacy!
  • 11. Anamorphic Sun Microsystems StrongTalk Java Stolen legacy!
  • 12. Anamorphic Sun Microsystems StrongTalk Java Stolen legacy!
  • 15. JIT
  • 16. Just-In-Time Compiler Compile When Code Runs
  • 19. JIT Spectrum Eager Lazy V8 CLR HotSpot HiPE
  • 20. JIT Spectrum Eager Lazy V8 CLR HotSpot HiPE Static Optimizations Runtime Optimizations
  • 21. HotSpot • C1: Client Compiler • C2: Server Compiler
  • 22. HotSpot • C1: Client Compiler • C2: Server Compiler • -XX:+TieredCompilation
  • 23. Mixed Mode Profiling JIT
  • 24. Start by interpreting JVM “emulates” bytecodes in userspace BYTECODE
  • 25. Locate “hot spots” Using runtime profiling information BYTECODE
  • 26. Generate machine code Compile JVM bytecode to native ISA after 10,000 calls 1 1 1 1 1 0 0 0 0 0 1 1 BYTECODE 1 1 1 0 0 0 0 0
  • 27. Optimizations • Inlining methods • Unrolling loops • Eliding locks • Eliminating dead code • Escape analysis
  • 28. Optimizations • Inlining methods • Unrolling loops • Eliding locks • Eliminating dead code • Escape analysis
  • 29. Inlining Combine and optimize across calls Method 1 CALL Method 2
  • 30. Inlining Combine and optimize across calls Method 1 Method 2
  • 31. Call Sites Where the magic happens... CALL
  • 32. Call Sites • Profile data • Monomorphic inline cache • Polymorphic inline cache
  • 34. Monomorphic Only one type seen at call site A CALL
  • 35. Bimorphic Two types seen at call site A CALL B
  • 36. Polymorphic Many types seen at call site A CALLB C
  • 37. Megamorphic Too many types seen at call site F D A CALL E G B C
  • 38. Inlining • Measure invocations and branches • Make an educated guess • Inline the code in question • Back out if we guessed wrong
  • 39. Deopt • Check invariants at a “safe point” • Did we guess wrong? • Revert optimization and try again
  • 41. Made for Java • InvokeVirtual • InvokeInterface • InvokeStatic • InvokeSpecial
  • 42. Non-Java call sites are opaque to HotSpot Can’t be inlined Method 1 CALL Method 2
  • 43. Teach HotSpot? See through non-Java call sites Method 1 CALL Method 2
  • 44. Inline just like Java Method 1 Method 2
  • 45. What if it worked for any language?
  • 48. InDy
  • 49. InDy • JSR-292: “Supporting Dynamically Typed Languages on the Java Platform” • Initial version shipped in Java 7 • Feeds directly into HotSpot in Java 8
  • 56. JVM Data Endpoints • Invoke operations • Array element access • Property lookup • And more!
  • 57. InDy Use Cases • Custom invocation • “Constant” values (e.g. globals, language intrinsics) • Scoped values (e.g. instance variables)
  • 59. Pieces of InDy • Bootstrap methods • Call sites • Method handles • Switch points
  • 61. Bootstrap method Wire up the call site
  • 62. Bootstrap method Your own code!
  • 63. Bootstrap Method • Called the first time each InDy call site is used • Find MethodHandle to dispatch • Return CallSite object
  • 64. Call Site Replaces InDy instruction in bytecode
  • 65. Call Site Holds onto a chain of MethodHandles
  • 66. java.lang.invoke.CallSite • ConstantCallSite: unchangeable • VolatileCallSite: seen coherently across cores • MutableCallSite: may appear different across cores
  • 67. Any of those can be subclassed
  • 68. java.lang.invoke.MethodHandle • Directly executable reference to a Java method (i.e. fast-as-Java) • Inlineable by HotSpot • MethodHandles all the way down
  • 69. Methods are first- class objects
  • 70. Project Lambda Lambdas for the JVM Coming in Java 8! (Summer 2013)
  • 72. Guarded Invocation MethodHandle.guardWithTest( ! MethodHandle test, ! MethodHandle target, ! MethodHandle fallback )
  • 73. fallback can rebind the call site Handle new types as they’re seen
  • 76. java.lang.invoke.SwitchPoint • Publish events across threads (e.g. blow caches when classes change) • Only event is valid -> invalid • Hooks directly into the HotSpot deoptimizer (no additional branches)
  • 78. Invocation example CallSite: where the call is taking place
  • 79. Invocation example CallSite: where the call is taking place SwitchPoint: did the class change?
  • 80. Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound?
  • 81. Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound? Target: invoke the target method
  • 82. Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound? Target: invoke the target method - or - Rebind: lookup new method and rebuild call site
  • 83. Invocation example CallSite: where the call is taking place SwitchPoint: did the class change? GuardWithTest: is this the type we bound? Target: invoke the target method - or - Rebind: lookup new method and rebuild call site - or - Rebind: lookup potentially changed methods
  • 84. InDy in the real world
  • 85. Is it good? To the assembly!
  • 86. Enabling ASM output java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly
  • 87. Contrived Ruby code def foo; 1; end def invoker; foo; end i = 0 while i < 10000   invoker   i+=1 end
  • 88. 0x00000001060a1be0: mov %eax,-0x14000(%rsp)   0x00000001060a1be7: push %rbp   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 89. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Stack juggling   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 90. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Is “self” a Ruby object?   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 91. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Same metaclass as before?   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 92. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Store Fixnum “1” for return   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 93. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Note: inside the “foo” method   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 94. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Stack juggling   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 95. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Safe point check   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 96. 0x00000001060a1be0: mov   0x00000001060a1be7: push %eax,-0x14000(%rsp) %rbp Done!   0x00000001060a1be8: sub $0x30,%rsp ;*synchronization entry                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@-1 (line 1)   0x00000001060a1bec: mov 0x8(%rcx),%r10d ; implicit exception: dispatches to 0x00000001060a1c55   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d ; {oop('org/jruby/RubyObject')}   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10 ;*checkcast                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@2 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1bfc: mov 0x10(%r10),%ebp ;*getfield metaClass                                                 ; - org.jruby.RubyBasicObject::getMetaClass@1 (line 520)                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@5 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c00: cmp $0xfed77602,%ebp ; {oop(a 'org/jruby/MetaClass')}   0x00000001060a1c06: jne 0x00000001060a1c1e ;*if_acmpne                                                 ; - org.jruby.runtime.invokedynamic.InvocationLinker::testMetaclass@8 (line 633)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@3                                                 ; - java.lang.invoke.MethodHandle::invokeExact@5                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax ;*areturn                                                 ; - ruby.__dash_e__::method__0$RUBY$foo@6 (line 1)                                                 ; - java.lang.invoke.MethodHandle::invokeExact@6                                                 ; - java.lang.invoke.MethodHandle::invokeExact@31                                                 ; - java.lang.invoke.MethodHandle::invokeExact@29                                                 ; - ruby.__dash_e__::method__1$RUBY$invoker@3 (line 1)                                                 ; {oop(a 'org/jruby/RubyFixnum')}   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip) # 0x00000001051de000                                                 ; {poll_return}   0x00000001060a1c1d: retq
  • 101. Twitter: @bascule Celluloid: celluloid.io Blog: unlimitednovelty.com