[PowerPC] Add a target option for invariant function descriptors

The PPC backend will now assume that PPC64 ELFv1 function descriptors are
invariant. This must be true for well-defined C/C++ code, but I'm providing an
option to disable this assumption in case someone's JIT-engine needs it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@226209 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index 4daddba332d7ac63623c79f00e77f6c7e68c2c72..5b58a57dca687fe3dc588a08a0bac58fcefd3439 100644 (file)
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -1228,6 +1228,11 @@ def mqpx : Flag<["-"], "mqpx">, Group<m_ppc_Features_Group>;
 def mno_qpx : Flag<["-"], "mno-qpx">, Group<m_ppc_Features_Group>;
 def mcrbits : Flag<["-"], "mcrbits">, Group<m_ppc_Features_Group>;
 def mno_crbits : Flag<["-"], "mno-crbits">, Group<m_ppc_Features_Group>;
+def minvariant_function_descriptors :
+  Flag<["-"], "minvariant-function-descriptors">, Group<m_ppc_Features_Group>;
+def mno_invariant_function_descriptors :
+  Flag<["-"], "mno-invariant-function-descriptors">,
+  Group<m_ppc_Features_Group>;
 
 def faltivec : Flag<["-"], "faltivec">, Group<f_Group>, Flags<[CC1Option]>,
   HelpText<"Enable AltiVec vector initializer syntax">;

diff --git a/test/Driver/ppc-features.cpp b/test/Driver/ppc-features.cpp
index f7cc879f39ac7ed6995d18ff7c5ad865276f968f..39d6357dccdac8d679b9af862b2d865a3cd8a142 100644 (file)
--- a/test/Driver/ppc-features.cpp
+++ b/test/Driver/ppc-features.cpp
@@ -113,6 +113,12 @@
 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-crbits -mcrbits -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-CRBITS %s
 // CHECK-CRBITS: "-target-feature" "+crbits"
 
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-invariant-function-descriptors -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-NOINVFUNCDESC %s
+// CHECK-NOINVFUNCDESC: "-target-feature" "-invariant-function-descriptors"
+
+// RUN: %clang -target powerpc64-unknown-linux-gnu %s -mno-invariant-function-descriptors -minvariant-function-descriptors -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK-INVFUNCDESC %s
+// CHECK-INVFUNCDESC: "-target-feature" "+invariant-function-descriptors"
+
 // Assembler features
 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -### -o %t.o -no-integrated-as 2>&1 | FileCheck -check-prefix=CHECK_BE_AS_ARGS %s
 // CHECK_BE_AS_ARGS: "-mppc64"