Fix cross-module call_indirects in the interpreter (#7964)

It was using the name of the function to look up the funcref in the
current module. Instead, use doCall so we can call another module's function.

Author: kripken

src/tools/wasm-ctor-eval.cpp

@@ -368,6 +368,9 @@ struct CtorEvalExternalInterface : EvallingModuleRunner::ExternalInterface {
     if (!Properties::isConstantExpression(value)) {
       throw FailToEvalException("tableLoad of non-literal");
     }
+    if (auto* r = value->dynCast<RefFunc>()) {
+      return instance->makeFuncData(r->func, r->type.getHeapType());
+    }
     return Properties::getLiteral(value);
   }
 

src/wasm-interpreter.h

@@ -3561,15 +3561,16 @@ class ModuleRunnerBase : public ExpressionRunner<SubType> {
       trap("non-function target in call_indirect");
     }
 
-    auto* func = self()->getModule()->getFunction(funcref.getFunc());
-    if (!HeapType::isSubType(func->type, curr->heapType)) {
+    // TODO: Throw a non-constant exception if the reference is to an imported
+    //       function that has a supertype of the expected type.
+    if (!HeapType::isSubType(funcref.type.getHeapType(), curr->heapType)) {
       trap("callIndirect: non-subtype");
     }
 
 #if WASM_INTERPRETER_DEBUG
     std::cout << self()->indent() << "(calling table)\n";
 #endif
-    Flow ret = callFunction(funcref.getFunc(), arguments);
+    Flow ret = funcref.getFuncData()->doCall(arguments);
 #if WASM_INTERPRETER_DEBUG
     std::cout << self()->indent() << "(returned to " << scope->function->name
               << ")\n";

test/spec/call_indirect_cross_module.wast

@@ -0,0 +1,55 @@
+
+;; Test for confusion regarding internal function names when using
+;; call_indirect.
+
+(module $primary
+  (import "spectest" "print_i32" (func $log (param i32)))
+
+  (func $run (export "run") (result funcref)
+    (call $log (i32.const -1))
+    (ref.func $run)
+  )
+)
+
+(register "primary")
+
+(module $secondary
+  (type $func (func (result funcref)))
+
+  (import "spectest" "print_i32" (func $log (param i32)))
+
+  (import "primary" "run" (func $primary_run (result funcref)))
+
+  (table $table 10 20 funcref)
+
+  (global $sum (mut i32) (i32.const 0))
+
+  (func $run (export "secondary_run") (result funcref)
+    (global.set $sum
+      (i32.add
+        (global.get $sum)
+        (i32.const 1)
+      )
+    )
+    (call $log (i32.const 10))
+    (table.set $table
+      (i32.const 0)
+      (call $primary_run)
+    )
+    (call $log (i32.const 20))
+    ;; This should call primary's $run, not ours. The overlap in internal name
+    ;; should not confuse us. If we do get confused, we'd recurse here and keep
+    ;; incrementing $sum.
+    (call_indirect (type $func)
+      (i32.const 0)
+    )
+  )
+
+  (func $sum (export "secondary_sum") (result i32)
+    (global.get $sum)
+  )
+)
+
+(invoke "secondary_run")
+(assert_return (invoke "secondary_sum") (i32.const 1))
+