Finalize tail call support (#2246)

Adds tail call support to fuzzer and makes small changes to handle return calls in multiple utilities and passes. Makes larger changes to DAE and inlining passes to properly handle tail calls.

1 files changed, 12 insertions, 2 deletions

diff --git a/src/passes/I64ToI32Lowering.cpp b/src/passes/I64ToI32Lowering.cpp
index e893b6296..5d7d5998c 100644
--- a/src/passes/I64ToI32Lowering.cpp
+++ b/src/passes/I64ToI32Lowering.cpp
@@ -262,9 +262,14 @@ struct I64ToI32Lowering : public WalkerPass<PostWalker<I64ToI32Lowering>> {
     return call;
   }
   void visitCall(Call* curr) {
+    if (curr->isReturn &&
+        getModule()->getFunction(curr->target)->result == i64) {
+      Fatal()
+        << "i64 to i32 lowering of return_call values not yet implemented";
+    }
     auto* fixedCall = visitGenericCall<Call>(
       curr, [&](std::vector<Expression*>& args, Type ty) {
-        return builder->makeCall(curr->target, args, ty);
+        return builder->makeCall(curr->target, args, ty, curr->isReturn);
       });
     // If this was to an import, we need to call the legal version. This assumes
     // that legalize-js-interface has been run before.
@@ -275,10 +280,15 @@ struct I64ToI32Lowering : public WalkerPass<PostWalker<I64ToI32Lowering>> {
   }
 
   void visitCallIndirect(CallIndirect* curr) {
+    if (curr->isReturn &&
+        getModule()->getFunctionType(curr->fullType)->result == i64) {
+      Fatal()
+        << "i64 to i32 lowering of return_call values not yet implemented";
+    }
     visitGenericCall<CallIndirect>(
       curr, [&](std::vector<Expression*>& args, Type ty) {
         return builder->makeCallIndirect(
-          curr->fullType, curr->target, args, ty);
+          curr->fullType, curr->target, args, ty, curr->isReturn);
       });
   }