Reland: "[WebAssembly] Add new pass to lower int/ptr conversions of reftypes"

Add new pass LowerRefTypesIntPtrConv to generate debugtrap
instruction for an inttoptr and ptrtoint of a reference type instead
of erroring, since calling these instructions on non-integral pointers
has been since allowed (see ac81cb7e6).

Differential Revision: https://reviews.llvm.org/D107102

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
index 746a759..10497e45 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
@@ -332,6 +332,7 @@ public:
   void addPostRegAlloc() override;
   bool addGCPasses() override { return false; }
   void addPreEmitPass() override;
+  bool addPreISel() override;
 
   // No reg alloc
   bool addRegAssignAndRewriteFast() override { return false; }
@@ -518,6 +519,12 @@ void WebAssemblyPassConfig::addPreEmitPass() {
   addPass(createWebAssemblyMCLowerPrePass());
 }
 
+bool WebAssemblyPassConfig::addPreISel() {
+  TargetPassConfig::addPreISel();
+  addPass(createWebAssemblyLowerRefTypesIntPtrConv());
+  return false;
+}
+
 yaml::MachineFunctionInfo *
 WebAssemblyTargetMachine::createDefaultFuncInfoYAML() const {
   return new yaml::WebAssemblyFunctionInfo();