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[docs] Coverage: Explain how to avoid static initializers 

llvm-svn: 272067
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Vedant Kumar 2016-06-07 22:25:29 +00:00
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commit b06294da84
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clang/docs/SourceBasedCodeCoverage.rst
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@ -185,6 +185,22 @@ Format compatibility guarantees
into instrumented binaries. Tools must retain **backwards** compatibility
with these formats. These formats are not forwards-compatible.
Using the profiling runtime without static initializers
=======================================================
By default the compiler runtime uses a static initializer to determine the
profile output path and to register a writer function. To collect profiles
without using static initializers, do this manually:
* Export a ``int __llvm_profile_runtime`` symbol. The linker won't pull in the
object file containing the profiling runtime's static initializer if this
symbol is defined.
* Call ``__llvm_profile_initialize_file`` once. This parses
``LLVM_PROFILE_FILE`` and sets the output path.
* Call ``__llvm_profile_write_file`` to write out a profile.
Drawbacks and limitations
=========================