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Currently, not all user specified relocations (with clang intrinsic __builtin_preserve_access_index()) will turn into relocations. In the current implementation, a __builtin_preserve_access_index() chain is turned into relocation only if the result of the clang intrinsic is used in a function call or a nonzero offset computation of getelementptr. For all other cases, the relocatiion request is ignored and the __builtin_preserve_access_index() is turned into regular getelementptr instructions. The main reason is to mimic bpf_probe_read() requirement. But there are other use cases where relocatable offset is generated but not used for bpf_probe_read(). This patch relaxed previous constraints when to generate relocations. Now, all user __builtin_preserve_access_index() will have relocations generated. Differential Revision: https://reviews.llvm.org/D67688 llvm-svn: 372198
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