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| author | Tom Roeder <tmroeder@google.com> | 2014-06-05 19:29:43 +0000 |
|---|---|---|
| committer | Tom Roeder <tmroeder@google.com> | 2014-06-05 19:29:43 +0000 |
| commit | 5d0f7af3dc42d7bc843858317fba3bb91c44d68f (patch) | |
| tree | c525924c6e517a0e74dc7c5329096c68c6a27a2f /lib/IR | |
| parent | 4db3ad47fc58e3cc2b8227b4e6ea0c126338463e (diff) | |
| download | llvm-5d0f7af3dc42d7bc843858317fba3bb91c44d68f.tar.gz llvm-5d0f7af3dc42d7bc843858317fba3bb91c44d68f.tar.bz2 llvm-5d0f7af3dc42d7bc843858317fba3bb91c44d68f.tar.xz | |
Add a new attribute called 'jumptable' that creates jump-instruction tables for functions marked with this attribute.
It includes a pass that rewrites all indirect calls to jumptable functions to pass through these tables.
This also adds backend support for generating the jump-instruction tables on ARM and X86.
Note that since the jumptable attribute creates a second function pointer for a
function, any function marked with jumptable must also be marked with unnamed_addr.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210280 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/IR')
| -rw-r--r-- | lib/IR/Attributes.cpp | 3 | ||||
| -rw-r--r-- | lib/IR/Verifier.cpp | 11 |
2 files changed, 13 insertions, 1 deletions
diff --git a/lib/IR/Attributes.cpp b/lib/IR/Attributes.cpp index a9074bb294..58475e2d3c 100644 --- a/lib/IR/Attributes.cpp +++ b/lib/IR/Attributes.cpp @@ -173,6 +173,8 @@ std::string Attribute::getAsString(bool InAttrGrp) const { return "inlinehint"; if (hasAttribute(Attribute::InReg)) return "inreg"; + if (hasAttribute(Attribute::JumpTable)) + return "jumptable"; if (hasAttribute(Attribute::MinSize)) return "minsize"; if (hasAttribute(Attribute::Naked)) @@ -395,6 +397,7 @@ uint64_t AttributeImpl::getAttrMask(Attribute::AttrKind Val) { case Attribute::OptimizeNone: return 1ULL << 42; case Attribute::InAlloca: return 1ULL << 43; case Attribute::NonNull: return 1ULL << 44; + case Attribute::JumpTable: return 1ULL << 45; } llvm_unreachable("Unsupported attribute type"); } diff --git a/lib/IR/Verifier.cpp b/lib/IR/Verifier.cpp index 6da8014a22..46beb13622 100644 --- a/lib/IR/Verifier.cpp +++ b/lib/IR/Verifier.cpp @@ -735,7 +735,8 @@ void Verifier::VerifyAttributeTypes(AttributeSet Attrs, unsigned Idx, I->getKindAsEnum() == Attribute::Builtin || I->getKindAsEnum() == Attribute::NoBuiltin || I->getKindAsEnum() == Attribute::Cold || - I->getKindAsEnum() == Attribute::OptimizeNone) { + I->getKindAsEnum() == Attribute::OptimizeNone || + I->getKindAsEnum() == Attribute::JumpTable) { if (!isFunction) { CheckFailed("Attribute '" + I->getAsString() + "' only applies to functions!", V); @@ -909,6 +910,14 @@ void Verifier::VerifyFunctionAttrs(FunctionType *FT, AttributeSet Attrs, Attribute::MinSize), "Attributes 'minsize and optnone' are incompatible!", V); } + + if (Attrs.hasAttribute(AttributeSet::FunctionIndex, + Attribute::JumpTable)) { + const GlobalValue *GV = cast<GlobalValue>(V); + Assert1(GV->hasUnnamedAddr(), + "Attribute 'jumptable' requires 'unnamed_addr'", V); + + } } void Verifier::VerifyBitcastType(const Value *V, Type *DestTy, Type *SrcTy) { |