Specify if `-mno-red-zone' was used when creating the GCOV instrucmentation pass.

This prevents the functions generated by that pass from using the red zone.
<rdar://problem/12843084>

llvm-svn: 169755

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index f6e9dd7..e960871 100644 (file)
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -294,7 +294,9 @@ void EmitAssemblyHelper::CreatePasses(TargetMachine *TM) {
   if (CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes) {
     MPM->add(createGCOVProfilerPass(CodeGenOpts.EmitGcovNotes,
                                     CodeGenOpts.EmitGcovArcs,
-                                    TargetTriple.isMacOSX()));
+                                    TargetTriple.isMacOSX(),
+                                    false,
+                                    CodeGenOpts.DisableRedZone));
 
     if (CodeGenOpts.getDebugInfo() == CodeGenOptions::NoDebugInfo)
       MPM->add(createStripSymbolsPass(true));

diff --git a/clang/test/CodeGen/code-coverage.c b/clang/test/CodeGen/code-coverage.c
new file mode 100644 (file)
index 0000000..b073ae6
--- /dev/null
+++ b/clang/test/CodeGen/code-coverage.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -O0  -mno-red-zone -fprofile-arcs -ftest-coverage -emit-llvm %s -o - | FileCheck %s
+// <rdar://problem/12843084>
+
+int test1(int a) {
+  switch (a % 2) {
+  case 0:
+    ++a;
+  case 1:
+    a /= 2;
+  }
+  return a;
+}
+
+// Check tha the `-mno-red-zone' flag is set here on the generated functions.
+
+// CHECK: void @__llvm_gcov_indirect_counter_increment(i32* %{{.*}}, i64** %{{.*}}) unnamed_addr noinline noredzone
+// CHECK: void @__llvm_gcov_writeout() unnamed_addr noinline noredzone
+// CHECK: void @__llvm_gcov_init() unnamed_addr noinline noredzone
+// CHECK: void @__gcov_flush() unnamed_addr noinline noredzone