Bug 1307446 - Disable async stacks by default in the JS shell and add command line option for enabling them. r=evilpie

MozReview-Commit-ID: HgF3UenbiFY

js/src/shell/js.cpp

@@ -314,6 +314,7 @@ static bool enableNativeRegExp = false;
 static bool enableUnboxedArrays = false;
 static bool enableSharedMemory = SHARED_MEMORY_DEFAULT;
 static bool enableWasmAlwaysBaseline = false;
+static bool enableAsyncStacks = false;
 #ifdef JS_GC_ZEAL
 static uint32_t gZealBits = 0;
 static uint32_t gZealFrequency = 0;
@@ -7132,6 +7133,7 @@ SetContextOptions(JSContext* cx, const OptionParser& op)
     enableNativeRegExp = !op.getBoolOption("no-native-regexp");
     enableUnboxedArrays = op.getBoolOption("unboxed-arrays");
     enableWasmAlwaysBaseline = op.getBoolOption("wasm-always-baseline");
+    enableAsyncStacks = op.getBoolOption("async-stacks");
 
     JS::ContextOptionsRef(cx).setBaseline(enableBaseline)
                              .setIon(enableIon)
@@ -7139,7 +7141,8 @@ SetContextOptions(JSContext* cx, const OptionParser& op)
                              .setWasm(true)
                              .setWasmAlwaysBaseline(enableWasmAlwaysBaseline)
                              .setNativeRegExp(enableNativeRegExp)
-                             .setUnboxedArrays(enableUnboxedArrays);
+                             .setUnboxedArrays(enableUnboxedArrays)
+                             .setAsyncStack(enableAsyncStacks);
 
     if (op.getBoolOption("no-unboxed-objects"))
         jit::JitOptions.disableUnboxedObjects = true;
@@ -7598,6 +7601,7 @@ main(int argc, char** argv, char** envp)
         || !op.addBoolOption('\0', "no-unboxed-objects", "Disable creating unboxed plain objects")
         || !op.addBoolOption('\0', "unboxed-arrays", "Allow creating unboxed arrays")
         || !op.addBoolOption('\0', "wasm-always-baseline", "Enable experimental Wasm baseline compiler when possible")
+        || !op.addBoolOption('\0', "async-stacks", "Enable capturing of async stacks, e.g. for Promises")
 #ifdef ENABLE_SHARED_ARRAY_BUFFER
         || !op.addStringOption('\0', "shared-memory", "on/off",
                                "SharedArrayBuffer and Atomics "