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Summary: (1) Function descriptor on AIX On AIX, a called routine may have 2 distinct symbols associated with it: * A function descriptor (Name) * A function entry point (.Name) The descriptor structure on AIX is the same as those in the ELF V1 ABI: * The address of the entry point of the function. * The TOC base address for the function. * The environment pointer. The descriptor symbol uses the same name as the source level function in C. The function entry point is analogous to the symbol we would generate for a function in a non-descriptor-based ABI, except that it is renamed by prepending a ".". Which symbol gets referenced depends on the context: * Taking the address of the function references the descriptor symbol. * Calling the function references the entry point symbol. (2) Speaking of implementation on AIX, for direct function call target, we create proper MCSymbol SDNode(e.g . ".foo") while constructing SDAG to replace original TargetGlobalAddress SDNode. Then down the path, we can take advantage of this MCSymbol. Patch by: Xiangling_L Reviewed by: sfertile, hubert.reinterpretcast, jasonliu, syzaara Differential Revision: https://reviews.llvm.org/D62532 llvm-svn: 362735
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