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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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11
lib/AsmParser/LLParser.cpp
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@ -956,6 +956,7 @@ bool LLParser::ParseOptionalFuncAttrs(AttrBuilder &B) {
case lltok::kw_returns_twice: B.addAttribute(Attribute::ReturnsTwice); break;
case lltok::kw_ssp: B.addAttribute(Attribute::StackProtect); break;
case lltok::kw_sspreq: B.addAttribute(Attribute::StackProtectReq); break;
case lltok::kw_sspstrong: B.addAttribute(Attribute::StackProtectStrong); break;
case lltok::kw_uwtable: B.addAttribute(Attribute::UWTable); break;
case lltok::kw_noduplicate: B.addAttribute(Attribute::NoDuplicate); break;
@ -1050,11 +1051,11 @@ bool LLParser::ParseOptionalReturnAttrs(AttrBuilder &B) {
case lltok::kw_readonly: case lltok::kw_inlinehint:
case lltok::kw_alwaysinline: case lltok::kw_optsize:
case lltok::kw_ssp: case lltok::kw_sspreq:
case lltok::kw_noredzone: case lltok::kw_noimplicitfloat:
case lltok::kw_naked: case lltok::kw_nonlazybind:
case lltok::kw_address_safety: case lltok::kw_minsize:
case lltok::kw_alignstack: case lltok::kw_align:
case lltok::kw_noduplicate:
case lltok::kw_sspstrong: case lltok::kw_noimplicitfloat:
case lltok::kw_noredzone: case lltok::kw_naked:
case lltok::kw_nonlazybind: case lltok::kw_address_safety:
case lltok::kw_minsize: case lltok::kw_alignstack:
case lltok::kw_align: case lltok::kw_noduplicate:
HaveError |= Error(Lex.getLoc(), "invalid use of function-only attribute");
break;
}