Wasm2c fuzz support: only emit a call to the hang limit function if present (#2977)

It may not be present while reducing a testcase, if the reducer removed it.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/tools/wasm2c-wrapper.h b/src/tools/wasm2c-wrapper.h
index 55eed0c35..b3205c6fe 100644
--- a/src/tools/wasm2c-wrapper.h
+++ b/src/tools/wasm2c-wrapper.h
@@ -85,9 +85,14 @@ int main(int argc, char** argv) {
   // wasm traps, and emitting a single one helps compilation speed into wasm as
   // compile times are O(size * num_setjmps).
   for (size_t curr = 0;; curr++) {
-    // Always call the hang limit initializer before each export.
+  )";
+  if (wasm.getExportOrNull("hangLimitInitializer")) {
+    ret += R"(
+    // If present, call the hang limit initializer before each export.
     (*Z_hangLimitInitializerZ_vv)();
-
+)";
+  }
+  ret += R"(
     // Prepare to call the export, so we can catch traps.
     if (WASM_RT_SETJMP(g_jmp_buf) != 0) {
       puts("exception!");