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.

llvm-svn: 210280

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/IPO/IPO.cpp b/llvm/lib/Transforms/IPO/IPO.cpp
index b4d31d8d6fc..38fd165e752 100644
--- a/llvm/lib/Transforms/IPO/IPO.cpp
+++ b/llvm/lib/Transforms/IPO/IPO.cpp
@@ -30,6 +30,7 @@ void llvm::initializeIPO(PassRegistry &Registry) {
   initializeGlobalDCEPass(Registry);
   initializeGlobalOptPass(Registry);
   initializeIPCPPass(Registry);
+  initializeJumpInstrTablesPass(Registry);
   initializeAlwaysInlinerPass(Registry);
   initializeSimpleInlinerPass(Registry);
   initializeInternalizePassPass(Registry);