Add AsmPrinter support for emitting a directive to declare that
the code being generated does not require an executable stack.
Also, add target-specific code to make use of this on Linux
on x86.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50634 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter.cpp
index 65b8c43..9c4e789 100644
--- a/lib/CodeGen/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter.cpp
@@ -192,6 +192,13 @@
E = CMM->begin(); I != E; )
(*--I)->finishAssembly(O, *this, *TAI);
+ // If we don't have any trampolines, then we don't require stack memory
+ // to be executable. Some targets have a directive to declare this.
+ Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
+ if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
+ if (TAI->getNonexecutableStackDirective())
+ O << TAI->getNonexecutableStackDirective() << "\n";
+
delete Mang; Mang = 0;
return false;
}