1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h b/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h
index 9c23412b3cc..4760f0d576e 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h
@@ -63,11 +63,19 @@ public:
   void initWARegs();
   void setWAReg(unsigned VReg, unsigned WAReg) {
     assert(WAReg != UnusedReg);
+    assert(TargetRegisterInfo::virtReg2Index(VReg) < WARegs.size());
     WARegs[TargetRegisterInfo::virtReg2Index(VReg)] = WAReg;
   }
   unsigned getWAReg(unsigned VReg) const {
+    assert(TargetRegisterInfo::virtReg2Index(VReg) < WARegs.size());
     return WARegs[TargetRegisterInfo::virtReg2Index(VReg)];
   }
+  // If new virtual registers are created after initWARegs has been called,
+  // this function can be used to add WebAssembly register mappings for them.
+  void addWAReg(unsigned VReg, unsigned WAReg) {
+    assert(VReg = WARegs.size());
+    WARegs.push_back(WAReg);
+  }
 };
 
 } // end namespace llvm