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[Attributor] Deduce "nosync" function attribute.

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Introduce and deduce "nosync" function attribute to indicate that a function
does not synchronize with another thread in a way that other thread might free memory.

Reviewers: jdoerfert, jfb, nhaehnle, arsenm

Subscribers: wdng, hfinkel, nhaenhle, mehdi_amini, steven_wu,
dexonsmith, arsenm, uenoku, hiraditya, jfb, llvm-commits

Differential Revision: https://reviews.llvm.org/D62766

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365830 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stefan Stipanovic
2019-07-11 21:37:40 +00:00
parent 97e268381d
commit 52d4c048b3
19 changed files with 675 additions and 60 deletions
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lib/Bitcode/Writer/BitcodeWriter.cpp
+2
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@@ -659,6 +659,8 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
return bitc::ATTR_KIND_NO_RED_ZONE;
case Attribute::NoReturn:
return bitc::ATTR_KIND_NO_RETURN;
case Attribute::NoSync:
return bitc::ATTR_KIND_NOSYNC;
case Attribute::NoCfCheck:
return bitc::ATTR_KIND_NOCF_CHECK;
case Attribute::NoUnwind: