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Corrections to the under the hood yada yada.
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Ian A Mason 2019-06-10 13:54:51 -07:00 committed by GitHub
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@ -121,18 +121,18 @@ This together with the slowness of python's `fork exec`-ing, and it's
interpreted nature accounts for the large efficiency gap between the interpreted nature accounts for the large efficiency gap between the
tool toolsets. tool toolsets.
Both inject the path of the bitcode version of the .o file into a Both inject the path of the bitcode version of the `.o` file into a
dedicated segment of the .o file itself. This segment is the same across dedicated segment of the `.o` file itself. This segment is the same across
toolsets, so extracting the bitcode can be done by the appropriate toolsets, so extracting the bitcode can be done by the appropriate
tool in either toolset. On *nix both toolsets use objcopy to add the tool in either toolset. On `*nix` both toolsets use `objcopy` to add the
segment, while on OS X they use ld. segment, while on OS X they use `ld`.
When the object files are linked into the resulting library or When the object files are linked into the resulting library or
executable, the bitcode path segments are appended, so the resulting executable, the bitcode path segments are appended, so the resulting
binary contains the paths of all the bitcode files that constitute the binary contains the paths of all the bitcode files that constitute the
binary. To extract the sections the `gllvm` toolset uses the golang binary. To extract the sections the `gllvm` toolset uses the golang
packages `"debug/elf"` and `"debug/macho"`, while the `wllvm` toolset uses packages `"debug/elf"` and `"debug/macho"`, while the `wllvm` toolset uses
`objdump` on *nix, and `otool` on OScX. `objdump` on *nix, and `otool` on OS X.
Both tools then use `llvm-link` or `llvm-ar` to combine the bitcode files Both tools then use `llvm-link` or `llvm-ar` to combine the bitcode files
into the desired form. into the desired form.