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Some functions have their sizes as zero in input binary's symbol table, like those compiled by assembler. When figuring out function sizes, we may create label symbol if it doesn't point to any constant island. However, before function size is known, marker symbol can not be correctly associated to a function and therefore all such checks would fail and we could end up adding a code label pointing to constant island as secondary entry point and later mistakenly marking the function as not simple. Querying the global marker symbol array has big throughput overhead. Instead we can run an extra check when post processing entry points to identify such label symbols that actually point to constant islands.
The LLVM Compiler Infrastructure
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This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
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