Implement the __builtin_call_with_static_chain GNU extension.

The extension has the following syntax:

  __builtin_call_with_static_chain(Call, Chain)
  where Call must be a function call expression and Chain must be of pointer type

This extension performs a function call Call with a static chain pointer
Chain passed to the callee in a designated register. This is useful for
calling foreign language functions whose ABI uses static chain pointers
(e.g. to implement closures).

Differential Revision: http://reviews.llvm.org/D6332

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224167 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 2 deletions

diff --git a/include/clang/CodeGen/CGFunctionInfo.h b/include/clang/CodeGen/CGFunctionInfo.h
index 8aea6c3708..102d25d79e 100644
--- a/include/clang/CodeGen/CGFunctionInfo.h
+++ b/include/clang/CodeGen/CGFunctionInfo.h
@@ -352,6 +352,9 @@ class CGFunctionInfo : public llvm::FoldingSetNode {
   /// Whether this is an instance method.
   unsigned InstanceMethod : 1;
 
+  /// Whether this is a chain call.
+  unsigned ChainCall : 1;
+
   /// Whether this function is noreturn.
   unsigned NoReturn : 1;
 
@@ -360,7 +363,7 @@ class CGFunctionInfo : public llvm::FoldingSetNode {
 
   /// How many arguments to pass inreg.
   unsigned HasRegParm : 1;
-  unsigned RegParm : 4;
+  unsigned RegParm : 3;
 
   RequiredArgs Required;
 
@@ -380,7 +383,8 @@ class CGFunctionInfo : public llvm::FoldingSetNode {
 
 public:
   static CGFunctionInfo *create(unsigned llvmCC,
-                                bool InstanceMethod,
+                                bool instanceMethod,
+                                bool chainCall,
                                 const FunctionType::ExtInfo &extInfo,
                                 CanQualType resultType,
                                 ArrayRef<CanQualType> argTypes,
@@ -412,6 +416,8 @@ public:
 
   bool isInstanceMethod() const { return InstanceMethod; }
 
+  bool isChainCall() const { return ChainCall; }
+
   bool isNoReturn() const { return NoReturn; }
 
   /// In ARC, whether this function retains its return value.  This
@@ -462,6 +468,7 @@ public:
   void Profile(llvm::FoldingSetNodeID &ID) {
     ID.AddInteger(getASTCallingConvention());
     ID.AddBoolean(InstanceMethod);
+    ID.AddBoolean(ChainCall);
     ID.AddBoolean(NoReturn);
     ID.AddBoolean(ReturnsRetained);
     ID.AddBoolean(HasRegParm);
@@ -473,12 +480,14 @@ public:
   }
   static void Profile(llvm::FoldingSetNodeID &ID,
                       bool InstanceMethod,
+                      bool ChainCall,
                       const FunctionType::ExtInfo &info,
                       RequiredArgs required,
                       CanQualType resultType,
                       ArrayRef<CanQualType> argTypes) {
     ID.AddInteger(info.getCC());
     ID.AddBoolean(InstanceMethod);
+    ID.AddBoolean(ChainCall);
     ID.AddBoolean(info.getNoReturn());
     ID.AddBoolean(info.getProducesResult());
     ID.AddBoolean(info.getHasRegParm());