Fix the code that was WRONG.

The registers are placed into the saved registers list in the reverse order,
which is why the original loop was written to loop backwards.

llvm-svn: 148064

1 files changed, 65 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 82860c26574..1b15cdcc810 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -930,6 +930,71 @@ bool AsmPrinter::doFinalization(Module &M) {
     if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
       OutStreamer.SwitchSection(S);
 
+  // If we have module flags, then emit them.
+  NamedMDNode *ModFlags = M.getNamedMetadata("llvm.module.flags");
+  if (ModFlags) {
+    const char *ObjCGCName = "Objective-C Garbage Collection";
+    const char *ObjCGCOnlyName = "Objective-C GC Only";
+    const char *ObjCImageInfoVersion = "Objective-C Image Info Version";
+    const char *ObjCImageInfoSec = "Objective-C Image Info Section";
+
+    MDNode *GC = 0;
+    MDNode *GCOnly = 0;
+    MDNode *ImageInfoVersion = 0;
+    MDNode *ImageInfoSec = 0;
+
+    for (unsigned I = 0, E = ModFlags->getNumOperands(); I != E; ++I) {
+      MDNode *MD = ModFlags->getOperand(I);
+      unsigned Behavior = cast<ConstantInt>(MD->getOperand(0))->getZExtValue();
+      (void) Behavior;
+      MDString *Str = cast<MDString>(MD->getOperand(1));
+
+      if (Str->getString() == ObjCImageInfoVersion) {
+        assert(Behavior == 1 && "Invalid behavior for module flag!");
+        ImageInfoVersion = MD;
+      } else if (Str->getString() == ObjCGCName) {
+        assert((Behavior == 1 || Behavior == 3) &&
+               "Invalid behavior for module flag!");
+        GC = MD;
+      } else if (Str->getString() == ObjCGCOnlyName) {
+        if (Behavior == 2) continue; // Ignore the 'require' clause.
+        GCOnly = MD;
+      } else if (Str->getString() == ObjCImageInfoSec) {
+        assert(Behavior == 1 && "Invalid behavior for module flag!");
+        ImageInfoSec = MD;
+      }
+    }
+
+    if (ImageInfoVersion || GC || GCOnly || ImageInfoSec) {
+      // FIXME: Duh!
+      unsigned version = 0;
+      unsigned flags = 0;
+
+      version =
+        cast<ConstantInt>(ImageInfoVersion->getOperand(2))->getZExtValue();
+      if (GC)
+        flags |= cast<ConstantInt>(GC->getOperand(2))->getZExtValue();
+      if (GCOnly)
+        flags |= cast<ConstantInt>(GCOnly->getOperand(2))->getZExtValue();
+
+      Type *Int32Ty = Type::getInt32Ty(M.getContext());
+      Constant *values[2] = {
+        ConstantInt::get(Int32Ty, version),
+        ConstantInt::get(Int32Ty, flags)
+      };
+      ArrayType *AT = ArrayType::get(Int32Ty, 2);
+      StringRef Sec = cast<MDString>(ImageInfoSec->getOperand(2))->getString();
+
+      GlobalVariable *GV =
+        cast<GlobalVariable>(M.getOrInsertGlobal("L_OBJC_IMAGE_INFO", AT));
+      GV->setConstant(true);
+      GV->setSection(Sec);
+      GV->setInitializer(ConstantArray::get(AT, values));
+
+      EmitGlobalVariable(GV);
+    }
+  }
+
   // Allow the target to emit any magic that it wants at the end of the file,
   // after everything else has gone out.
   EmitEndOfAsmFile(M);