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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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2
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -177,6 +177,8 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
return bitc::ATTR_KIND_INLINE_HINT;
case Attribute::InReg:
return bitc::ATTR_KIND_IN_REG;
case Attribute::JumpTable:
return bitc::ATTR_KIND_JUMP_TABLE;
case Attribute::MinSize:
return bitc::ATTR_KIND_MIN_SIZE;
case Attribute::Naked: