PNaCl: Add ExpandByVal pass for expanding out by-value struct args and results

This pass expands out the "byval" and "sret" argument attributes.

This will affect the calling conventions for PPAPI under PNaCl (for
passing PP_Var etc. by value), so the PNaCl PPAPI shims will need to
be updated in order to enable this pass by default.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3400
TEST=PNaCl toolchain trybots + GCC torture tests + LLVM test suite + Spec2k

Review URL: https://codereview.chromium.org/13973018

1 files changed, 1 insertions, 0 deletions

diff --git a/include/llvm/Transforms/NaCl.h b/include/llvm/Transforms/NaCl.h
index 650779c058..ba765c1c21 100644
--- a/include/llvm/Transforms/NaCl.h
+++ b/include/llvm/Transforms/NaCl.h
@@ -19,6 +19,7 @@ class ModulePass;
 class Use;
 class Value;
 
+ModulePass *createExpandByValPass();
 FunctionPass *createExpandConstantExprPass();
 ModulePass *createExpandCtorsPass();
 BasicBlockPass *createExpandGetElementPtrPass();