[NFC] Send the closed-world flag to TranslateToFuzzReader (#7136)

This sends --closed-world to wasm-opt from the fuzzer, when we use that
flag (before we just used it on optimizations, but not fuzz generation). And
TranslateToFuzzReader now stores a boolean about whether we are in closed-
world mode or not.

This has no effect so far, and is a refactoring for a later PR, where we must
generate code differently based on whether we are in closed-world mode
or not.

1 files changed, 13 insertions, 6 deletions

diff --git a/src/tools/fuzzing/fuzzing.cpp b/src/tools/fuzzing/fuzzing.cpp
index 7e87f4f58..ab200a126 100644
--- a/src/tools/fuzzing/fuzzing.cpp
+++ b/src/tools/fuzzing/fuzzing.cpp
@@ -32,8 +32,10 @@ namespace {
 } // anonymous namespace
 
 TranslateToFuzzReader::TranslateToFuzzReader(Module& wasm,
-                                             std::vector<char>&& input)
-  : wasm(wasm), builder(wasm), random(std::move(input), wasm.features) {
+                                             std::vector<char>&& input,
+                                             bool closedWorld)
+  : wasm(wasm), closedWorld(closedWorld), builder(wasm),
+    random(std::move(input), wasm.features) {
 
   // Half the time add no unreachable code so that we'll execute the most code
   // as possible with no early exits.
@@ -50,9 +52,11 @@ TranslateToFuzzReader::TranslateToFuzzReader(Module& wasm,
 }
 
 TranslateToFuzzReader::TranslateToFuzzReader(Module& wasm,
-                                             std::string& filename)
-  : TranslateToFuzzReader(
-      wasm, read_file<std::vector<char>>(filename, Flags::Binary)) {}
+                                             std::string& filename,
+                                             bool closedWorld)
+  : TranslateToFuzzReader(wasm,
+                          read_file<std::vector<char>>(filename, Flags::Binary),
+                          closedWorld) {}
 
 void TranslateToFuzzReader::pickPasses(OptimizationOptions& options) {
   // Pick random passes to further shape the wasm. This is similar to how we
@@ -197,8 +201,11 @@ void TranslateToFuzzReader::pickPasses(OptimizationOptions& options) {
       case 41:
         // GC specific passes.
         if (wasm.features.hasGC()) {
-          // Most of these depend on closed world, so just set that.
+          // Most of these depend on closed world, so just set that. Set it both
+          // on the global pass options, and in the internal state of this
+          // TranslateToFuzzReader instance.
           options.passOptions.closedWorld = true;
+          closedWorld = true;
 
           switch (upTo(16)) {
             case 0: