1 files changed, 106 insertions, 0 deletions
diff --git a/clang/test/CodeGen/blockstret.c b/clang/test/CodeGen/blockstret.c
new file mode 100644
index 0000000..d5dae6f
--- /dev/null
+++ b/clang/test/CodeGen/blockstret.c
@@ -0,0 +1,106 @@
+// RUN: %clang_cc1 -fblocks -triple x86_64-apple-darwin9 %s -emit-llvm -o - | FileCheck %s -check-prefix=X64
+// RUN: %clang_cc1 -fblocks -triple i686-apple-darwin9 %s -emit-llvm -o - | FileCheck %s -check-prefix=X32
+
+// X64:   internal constant {{.*}} { i8** @_NSConcreteGlobalBlock, i32 1879048192
+// X64:     store i32 1610612736, i32* %want
+
+// X32:   @_NSConcreteGlobalBlock, i32 1879048192, i32 0,
+// X32:   store i32 1610612736, i32* %want
+
+// rdar://7677537
+int printf(const char *, ...);
+void *malloc(__SIZE_TYPE__ size);
+
+typedef struct bigbig {
+   int array[512];
+   char more[32];
+} BigStruct_t;
+
+BigStruct_t (^global)(void) = ^{ return *(BigStruct_t *)malloc(sizeof(struct bigbig)); };
+
+const char * getBlockSignature(void *);
+ 
+BigStruct_t foo(int param) {
+   BigStruct_t x;
+   BigStruct_t (^f)(int) = ^(int param) {
+     BigStruct_t *result = malloc(sizeof(BigStruct_t));
+     result->array[23] = param;
+     return *result;
+   };
+   getBlockSignature(f);
+   return x;
+}
+
+enum {
+    BLOCK_HAS_COPY_DISPOSE =  (1 << 25),
+    BLOCK_HAS_CXX_OBJ =       (1 << 26),
+    BLOCK_IS_GLOBAL =         (1 << 28),
+    BLOCK_USE_STRET =    (1 << 29),
+    BLOCK_HAS_OBJC_TYPE  =    (1 << 30)
+};
+
+struct block_descriptor_big {
+    unsigned long int reserved;
+    unsigned long int size;
+    void (*copy)(void *dst, void *src); // conditional on BLOCK_HAS_COPY_DISPOSE
+    void (*dispose)(void *);            // conditional on BLOCK_HAS_COPY_DISPOSE
+    const char *signature;                  // conditional on BLOCK_HAS_OBJC
+    const char *layout;                 // conditional on BLOCK_HAS_OBJC
+};
+struct block_descriptor_small {
+    unsigned long int reserved;
+    unsigned long int size;
+    const char *signature;              // conditional on BLOCK_HAS_OBJC
+    const char *layout;                 // conditional on BLOCK_HAS_OBJC
+};
+
+struct block_layout_abi { // can't change
+  void *isa;
+  int flags;
+  int reserved; 
+  void (*invoke)(void *, ...);
+  struct block_descriptor_big *descriptor;
+};
+
+const char *getBlockSignature(void *block) {
+   struct block_layout_abi *layout = (struct block_layout_abi *)block;
+   if ((layout->flags & BLOCK_HAS_OBJC_TYPE) != BLOCK_HAS_OBJC_TYPE) return 0;
+   if (layout->flags & BLOCK_HAS_COPY_DISPOSE) 
+      return layout->descriptor->signature;
+   else
+      return ((struct block_descriptor_small *)layout->descriptor)->signature;
+}
+
+int usesStruct(void *block) {
+   struct block_layout_abi *layout = (struct block_layout_abi *)block;
+   int want = BLOCK_HAS_OBJC_TYPE | BLOCK_USE_STRET;
+   return (layout->flags & want) == want;
+}
+    
+   
+int main(int argc, char *argv[]) {
+   printf("desired global flags: %d\n", BLOCK_USE_STRET | BLOCK_IS_GLOBAL  | BLOCK_HAS_OBJC_TYPE);
+   printf("desired stack flags: %d\n",  BLOCK_USE_STRET | BLOCK_HAS_OBJC_TYPE);
+   
+   printf("should be non-zero: %d\n", usesStruct(global));
+   BigStruct_t x;
+   BigStruct_t (^local)(int) = ^(int param) {
+     BigStruct_t *result = (BigStruct_t *)malloc(sizeof(BigStruct_t));
+     result->array[23] = argc;
+     return *result;
+   };
+   printf("should be non-zero: %d\n", usesStruct(global));
+   printf("should be non-zero: %d\n", usesStruct(local));
+   printf("should be zero: %d\n", usesStruct(^void(int x){ }));
+   return 0;
+}
+
+/*
+desired global flags: 1879048192
+desired stack flags: 1610612736
+should be non-zero: 1
+should be non-zero: 1
+should be non-zero: 1
+should be zero: 0
+
+*/