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Add a new attribute called 'jumptable' that creates jump-instruction tables for functions marked with this attribute.

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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
This commit is contained in:
Tom Roeder
2014-06-05 19:29:43 +00:00
parent 4db3ad47fc
commit 5d0f7af3dc
40 changed files with 1109 additions and 8 deletions
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11
lib/IR/Verifier.cpp
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@ -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) {