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| author | whitequark <whitequark@whitequark.org> | 2017-06-21 18:46:50 +0000 |
|---|---|---|
| committer | whitequark <whitequark@whitequark.org> | 2017-06-21 18:46:50 +0000 |
| commit | ed54b4a7985000624229f2375233eb3c6a9b23fc (patch) | |
| tree | ca66ba5e0f61c8b2d913d4e974bba1b53a363313 /llvm/lib/IR/Attributes.cpp | |
| parent | 47f856095a0180c01a07e5c72769a4163efd9d98 (diff) | |
| download | bcm5719-llvm-ed54b4a7985000624229f2375233eb3c6a9b23fc.tar.gz bcm5719-llvm-ed54b4a7985000624229f2375233eb3c6a9b23fc.zip | |
Add a "probe-stack" attribute
This attribute is used to ensure the guard page is triggered on stack
overflow. Stack frames larger than the guard page size will generate
a call to __probestack to touch each page so the guard page won't
be skipped.
Reviewed By: majnemer
Differential Revision: https://reviews.llvm.org/D34386
llvm-svn: 305939
Diffstat (limited to 'llvm/lib/IR/Attributes.cpp')
| -rw-r--r-- | llvm/lib/IR/Attributes.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/IR/Attributes.cpp b/llvm/lib/IR/Attributes.cpp index a518f7b5c81..ba2ec93ac24 100644 --- a/llvm/lib/IR/Attributes.cpp +++ b/llvm/lib/IR/Attributes.cpp @@ -1638,6 +1638,13 @@ static void adjustCallerSSPLevel(Function &Caller, const Function &Callee) { Caller.addFnAttr(Attribute::StackProtect); } +/// \brief If the inlined function required stack probes, then ensure that +/// the calling function has those too. +static void adjustCallerStackProbes(Function &Caller, const Function &Callee) { + if (!Caller.hasFnAttribute("probe-stack") && Callee.hasFnAttribute("probe-stack")) + Caller.addFnAttr("probe-stack", Callee.getFnAttribute("probe-stack").getValueAsString()); +} + #define GET_ATTR_COMPAT_FUNC #include "AttributesCompatFunc.inc" |
