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JRuby 9.1.6.0 example of massign (paralle assignment) optimized
jit.dumping=true
jit.logging=true
jit.logging.verbose=true
jit.threshold=500
def foo(a, b, c)
a, b, c = c, a, b
a
end
(501+20000).times { foo(1, 2, 3) }
__END__
foo is optimized by JRuby and HotSpot Server Compiler into equivalent of:
def foo(a, b, c)
c
end
$ ~/sdk/jruby-9.1.6.0/bin/jirb
2017-01-09T13:27:23.030-08:00: Ruby: compiled: ~/sdk/jruby-9.1.6.0/bin/jirb
irb(main):001:0> def foo(a, b, c)
irb(main):002:1> a, b, c = c, a, b
irb(main):003:1> a
irb(main):004:1> end
=> nil
irb(main):005:0> (501+20000).times { foo(1, 2, 3) }
// class version 51.0 (51)
// access flags 0x21
public class rubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006 extends org/jruby/ast/executable/AbstractScript {
// compiled from: (irb)
// debug info: /private/tmp/test_jruby/(irb)
// access flags 0x100A
private static setPosition(Lorg/jruby/runtime/ThreadContext;I)V
ALOAD 0
LDC "(irb)"
ILOAD 1
INVOKEVIRTUAL org/jruby/runtime/ThreadContext.setFileAndLine (Ljava/lang/String;I)V
RETURN
MAXSTACK = 3
MAXLOCALS = 2
// access flags 0x1
public <init>()V
ALOAD 0
INVOKESPECIAL org/jruby/ast/executable/AbstractScript.<init> ()V
ALOAD 0
LDC "(irb)"
PUTFIELD rubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006.filename : Ljava/lang/String;
ALOAD 0
NEW org/jruby/ast/executable/RuntimeCache
DUP
INVOKESPECIAL org/jruby/ast/executable/RuntimeCache.<init> ()V
PUTFIELD org/jruby/ast/executable/AbstractScript.runtimeCache : Lorg/jruby/ast/executable/RuntimeCache;
ALOAD 0
LDC "\uffff\u0001\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000"
INVOKEVIRTUAL org/jruby/ast/executable/AbstractScript.initFromDescriptor (Ljava/lang/String;)V
RETURN
MAXSTACK = 3
MAXLOCALS = 1
// access flags 0x9
public static __file__(Lrubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
@Lorg/jruby/anno/JRubyMethod;(name="__file__", frame=true, required=3, optional=0, rest=false)
L0
ALOAD 3
ASTORE 11
ALOAD 4
ASTORE 12
ALOAD 5
ASTORE 13
L1
LINENUMBER 2 L1
ALOAD 13
ALOAD 11
ALOAD 12
DUP_X2
POP
SWAP
ASTORE 11
ASTORE 12
ASTORE 13
L2
LINENUMBER 3 L2
ALOAD 11
ARETURN
LOCALVARIABLE a Lorg/jruby/runtime/builtin/IRubyObject; L0 L0 11
LOCALVARIABLE b Lorg/jruby/runtime/builtin/IRubyObject; L0 L0 12
LOCALVARIABLE c Lorg/jruby/runtime/builtin/IRubyObject; L0 L0 13
MAXSTACK = 4
MAXLOCALS = 14
// access flags 0x1
public __file__(Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;[Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
ALOAD 0
ALOAD 1
ALOAD 2
ALOAD 3
ALOAD 4
INVOKESTATIC rubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006.__file__ (Lrubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;[Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
ARETURN
MAXSTACK = 5
MAXLOCALS = 5
// access flags 0x1
public __file__(Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
ALOAD 0
ALOAD 1
ALOAD 2
ALOAD 3
ALOAD 4
ALOAD 5
ALOAD 6
INVOKESTATIC rubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006.__file__ (Lrubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
ARETURN
MAXSTACK = 7
MAXLOCALS = 7
// access flags 0x1009
public static __file__(Lrubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;[Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
ALOAD 1
ALOAD 3
ICONST_3
INVOKESTATIC org/jruby/runtime/Helpers.checkArgumentCount (Lorg/jruby/runtime/ThreadContext;[Lorg/jruby/runtime/builtin/IRubyObject;I)V
ALOAD 0
ALOAD 1
ALOAD 2
ALOAD 3
LDC 0
AALOAD
ALOAD 3
LDC 1
AALOAD
ALOAD 3
LDC 2
AALOAD
ALOAD 4
INVOKESTATIC rubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006.__file__ (Lrubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
ARETURN
MAXSTACK = 7
MAXLOCALS = 5
}
2017-01-09T13:27:26.311-08:00: JITCompiler: done jitting:Object.Object.foo at (irb):1
=> 20501
irb(main):006:0>
public static __file__(Lrubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd231043998006;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
@Lorg/jruby/anno/JRubyMethod;(name="__file__", frame=true, required=3, optional=0, rest=false)
L0
ALOAD 3
ASTORE 11
ALOAD 4
ASTORE 12
ALOAD 5
ASTORE 13
L1
LINENUMBER 2 L1
ALOAD 13
ALOAD 11
ALOAD 12
DUP_X2
POP
SWAP
ASTORE 11
ASTORE 12
ASTORE 13
L2
LINENUMBER 3 L2
ALOAD 11
ARETURN
LOCALVARIABLE a Lorg/jruby/runtime/builtin/IRubyObject; L0 L0 11
LOCALVARIABLE b Lorg/jruby/runtime/builtin/IRubyObject; L0 L0 12
LOCALVARIABLE c Lorg/jruby/runtime/builtin/IRubyObject; L0 L0 13
MAXSTACK = 4
MAXLOCALS = 14
$ JAVA_OPTS="-XX:-TieredCompilation -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly" ~/sdk/jruby-9.1.6.0/bin/jirb
...
Decoding compiled method 0x000000010772e990:
Code:
[Entry Point]
[Constants]
# {method} '__file__' '(Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;' in 'rubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd23594590671'
# this: rsi:rsi = 'rubyjit/Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd23594590671'
# parm0: rdx:rdx = 'org/jruby/runtime/ThreadContext'
# parm1: rcx:rcx = 'org/jruby/runtime/builtin/IRubyObject'
# parm2: r8:r8 = 'org/jruby/runtime/builtin/IRubyObject'
# parm3: r9:r9 = 'org/jruby/runtime/builtin/IRubyObject'
# parm4: rdi:rdi = 'org/jruby/runtime/builtin/IRubyObject'
# parm5: [sp+0x20] = 'org/jruby/runtime/Block' (sp of caller)
0x000000010772eac0: mov 0x8(%rsi),%r10d
0x000000010772eac4: shl $0x3,%r10
0x000000010772eac8: cmp %r10,%rax
0x000000010772eacb: jne 0x000000010768d960 ; {runtime_call}
0x000000010772ead1: data32 xchg %ax,%ax
0x000000010772ead4: nopl 0x0(%rax,%rax,1)
0x000000010772eadc: data32 data32 xchg %ax,%ax
[Verified Entry Point]
0x000000010772eae0: sub $0x18,%rsp
0x000000010772eae7: mov %rbp,0x10(%rsp) ;*synchronization entry
; - rubyjit.Object$$foo_4bf0e5f1cc4a54c5f4e2f8727e91176c740fdd23594590671::__file__@-1
0x000000010772eaec: mov %rdi,%rax
0x000000010772eaef: add $0x10,%rsp
0x000000010772eaf3: pop %rbp
0x000000010772eaf4: test %eax,-0x158eafa(%rip) # 0x00000001061a0000
; {poll_return}
0x000000010772eafa: retq
0x000000010772eafb: hlt
0x000000010772eafc: hlt
0x000000010772eafd: hlt
0x000000010772eafe: hlt
0x000000010772eaff: hlt
[Exception Handler]
[Stub Code]
0x000000010772eb00: jmpq 0x00000001076b98e0 ; {no_reloc}
[Deopt Handler Code]
0x000000010772eb05: callq 0x000000010772eb0a
0x000000010772eb0a: subq $0x5,(%rsp)
0x000000010772eb0f: jmpq 0x000000010768eb00 ; {runtime_call}
0x000000010772eb14: hlt
0x000000010772eb15: hlt
0x000000010772eb16: hlt
0x000000010772eb17: hlt
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