{"push_id":1158825383,"size":1,"distinct_size":1,"ref":"refs/heads/master","head":"9c2a3745ff6b33a2d355de07c5471bb1a654cb7f","before":"4e4d1143217cf75e9d4d859c26638a221171002e","commits":[{"sha":"9c2a3745ff6b33a2d355de07c5471bb1a654cb7f","author":{"name":"Peter Collingbourne","email":"6214814a67b9688a08e8c6dc7fa5dee076dddc8d@pcc.me.uk"},"message":"IR: Introduce local_unnamed_addr attribute.\n\nIf a local_unnamed_addr attribute is attached to a global, the address\nis known to be insignificant within the module. It is distinct from the\nexisting unnamed_addr attribute in that it only describes a local property\nof the module rather than a global property of the symbol.\n\nThis attribute is intended to be used by the code generator and LTO to allow\nthe linker to decide whether the global needs to be in the symbol table. It is\npossible to exclude a global from the symbol table if three things are true:\n- This attribute is present on every instance of the global (which means that\n  the normal rule that the global must have a unique address can be broken without\n  being observable by the program by performing comparisons against the global's\n  address)\n- The global has linkonce_odr linkage (which means that each linkage unit must have\n  its own copy of the global if it requires one, and the copy in each linkage unit\n  must be the same)\n- It is a constant or a function (which means that the program cannot observe that\n  the unique-address rule has been broken by writing to the global)\n\nAlthough this attribute could in principle be computed from the module\ncontents, LTO clients (i.e. linkers) will normally need to be able to compute\nthis property as part of symbol resolution, and it would be inefficient to\nmaterialize every module just to compute it.\n\nSee:\nhttp://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160509/356401.html\nhttp://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160516/356738.html\nfor earlier discussion.\n\nPart of the fix for PR27553.\n\nDifferential Revision: http://reviews.llvm.org/D20348","distinct":true,"url":"https://api.github.com/repos/llvm-project/llvm-project/commits/9c2a3745ff6b33a2d355de07c5471bb1a654cb7f"}]}
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