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Add the IR attribute 'sspstrong'.

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SSPStrong applies a heuristic to insert stack protectors in these situations:

* A Protector is required for functions which contain an array, regardless of
  type or length.

* A Protector is required for functions which contain a structure/union which
  contains an array, regardless of type or length.  Note, there is no limit to
  the depth of nesting.

* A protector is required when the address of a local variable (i.e., stack
  based variable) is exposed. (E.g., such as through a local whose address is
  taken as part of the RHS of an assignment or a local whose address is taken as
  part of a function argument.)

This patch implements the SSPString attribute to be equivalent to
SSPRequired. This will change in a subsequent patch.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173230 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2013-01-23 06:41:41 +00:00
parent 28d65722d6
commit 114baee1fa
14 changed files with 856 additions and 44 deletions
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3
lib/IR/Attributes.cpp
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@ -206,6 +206,8 @@ std::string Attribute::getAsString() const {
Result += "ssp ";
if (hasAttribute(Attribute::StackProtectReq))
Result += "sspreq ";
if (hasAttribute(Attribute::StackProtectStrong))
Result += "sspstrong ";
if (hasAttribute(Attribute::NoRedZone))
Result += "noredzone ";
if (hasAttribute(Attribute::NoImplicitFloat))
@ -487,6 +489,7 @@ uint64_t AttributeImpl::getAttrMask(Attribute::AttrKind Val) {
case Attribute::AddressSafety: return 1ULL << 32;
case Attribute::MinSize: return 1ULL << 33;
case Attribute::NoDuplicate: return 1ULL << 34;
case Attribute::StackProtectStrong: return 1ULL << 35;
}
llvm_unreachable("Unsupported attribute type");
}