Set function attribute llvm::Attribute::NoRedZone appropriately.

llvm-svn: 72902

clang/include/clang/Frontend/CompileOptions.h

@@ -41,6 +41,7 @@ public:
                                   /// should be run through the LLVM Verifier.
   unsigned TimePasses        : 1; /// Set when -ftime-report is enabled.
   unsigned NoCommon          : 1; /// Set when -fno-common or C++ is enabled.
+  unsigned DisableRedZone    : 1; /// Set when -mno-red-zone is enabled.
 
   /// Inlining - The kind of inlining to perform.
   InliningMethod Inlining;
@@ -63,6 +64,7 @@ public:
     TimePasses = 0;
     NoCommon = 0;
     Inlining = NoInlining;
+    DisableRedZone = 0;
   }  
 };
 

clang/lib/CodeGen/CGCall.cpp

@@ -21,6 +21,7 @@
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/RecordLayout.h"
+#include "clang/Frontend/CompileOptions.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Attributes.h"
 #include "llvm/Support/CallSite.h"
@@ -1751,6 +1752,9 @@ void CodeGenModule::ConstructAttributeList(const CGFunctionInfo &FI,
       FuncAttrs |= llvm::Attribute::ReadOnly;
   }
 
+  if (CompileOpts.DisableRedZone)
+    FuncAttrs |= llvm::Attribute::NoRedZone;
+
   QualType RetTy = FI.getReturnType();
   unsigned Index = 1;
   const ABIArgInfo &RetAI = FI.getReturnInfo();

clang/tools/clang-cc/clang-cc.cpp

@@ -1395,6 +1395,12 @@ TargetCPU("mcpu",
 static llvm::cl::list<std::string>
 TargetFeatures("target-feature", llvm::cl::desc("Target specific attributes"));
 
+
+static llvm::cl::opt<bool>
+DisableRedZone("disable-red-zone",
+               llvm::cl::desc("Do not emit code that uses the red zone."),
+               llvm::cl::init(false));
+
 /// ComputeTargetFeatures - Recompute the target feature list to only
 /// be the list of things that are enabled, based on the target cpu
 /// and feature list.
@@ -1471,6 +1477,8 @@ static void InitializeCompileOptions(CompileOptions &Opts,
   
   // Handle -ftime-report.
   Opts.TimePasses = TimeReport;
+
+  Opts.DisableRedZone = DisableRedZone;
 }
 
 //===----------------------------------------------------------------------===//