a ridiculous amount of propagation through the backend later,

have the code generate slap a srcloc metadata on inline asm nodes.
This allows us to diagnose invalid inline asms with such nice 
diagnostics as:

<inline asm>:1:2: error: unrecognized instruction
        abc incl    %eax
        ^
asm.c:2:12: note: generated from here
  __asm__ ("abc incl    %0" : "+r" (X));
           ^
2 diagnostics generated.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@100608 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 2 deletions

diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index ae2f791719..6604b91db9 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -1044,9 +1044,10 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
         // Use ptrtoint as appropriate so that we can do our extension.
         if (isa<llvm::PointerType>(Arg->getType()))
           Arg = Builder.CreatePtrToInt(Arg,
-                                      llvm::IntegerType::get(VMContext, LLVMPointerWidth));
+                           llvm::IntegerType::get(VMContext, LLVMPointerWidth));
         unsigned OutputSize = (unsigned)getContext().getTypeSize(OutputTy);
-        Arg = Builder.CreateZExt(Arg, llvm::IntegerType::get(VMContext, OutputSize));
+        Arg = Builder.CreateZExt(Arg,
+                                 llvm::IntegerType::get(VMContext, OutputSize));
       }
     }
 
@@ -1102,6 +1103,12 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
   llvm::CallInst *Result = Builder.CreateCall(IA, Args.begin(), Args.end());
   Result->addAttribute(~0, llvm::Attribute::NoUnwind);
 
+  // Slap the source location of the inline asm into a !srcloc metadata on the
+  // call.
+  unsigned LocID = S.getAsmString()->getLocStart().getRawEncoding();
+  llvm::Value *LocIDC =
+    llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LocID);
+  Result->setMetadata("srcloc", llvm::MDNode::get(VMContext, &LocIDC, 1));
 
   // Extract all of the register value results from the asm.
   std::vector<llvm::Value*> RegResults;