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Method handle calling sequence is a variation of the virtual calling sequence. (The gory details [are documented elsewhere|CallingSequences.) The caller sets up the call as if the method handle were the receiver of a virtual call (which is nominally invoke).
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callSite: set #callSiteType, CHECK load (MH + #handler), TEM call (TEM) --- callHandler: cmp (MH + #type), CHECK jump,ne wrongMethodType load (MH + #method), METHOD load (METHOD + #compiledEntry), TEM jump (TEM) --- compiledEntry: ... |
Thus, a compiled call to a non-constant method handle can be completed in a small handful of instructions, including about four memory references and two indirect branches.
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