[WebAssembly] Add support for using a wasm global for the stack pointer.

This replaces the __stack_pointer variable which was allocated in linear
memory.

llvm-svn: 296201

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
index 56bb550c72f..c272eb4cbf5 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
@@ -27,6 +27,7 @@
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineModuleInfoImpls.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/MC/MCContext.h"
@@ -92,6 +93,11 @@ void WebAssemblyAsmPrinter::EmitEndOfAsmFile(Module &M) {
                                MCConstantExpr::create(Size, OutContext));
     }
   }
+
+  if (!TM.getTargetTriple().isOSBinFormatELF()) {
+    MachineModuleInfoWasm &MMIW = MMI->getObjFileInfo<MachineModuleInfoWasm>();
+    getTargetStreamer()->emitGlobal(MMIW.getGlobals());
+  }
 }
 
 void WebAssemblyAsmPrinter::EmitConstantPool() {