Bug 882514: Don't try to enable Ion on functions with no script; r=h4writer

js/src/ion/AsmJS.cpp

@@ -5231,9 +5231,11 @@ GenerateEntries(ModuleCompiler &m)
 }
 
 static inline bool
-TryEnablingIon(JSContext *cx, AsmJSModule::ExitDatum *exitDatum, int32_t argc, Value *argv) {
-
-    JSScript *script = exitDatum->fun->nonLazyScript();
+TryEnablingIon(JSContext *cx, AsmJSModule::ExitDatum *exitDatum, int32_t argc, Value *argv)
+{
+    JSScript *script = exitDatum->fun->maybeNonLazyScript();
+    if (!script)
+        return true;
 
     // Test if the function is Ion compiled
     if (!script->hasIonScript())

js/src/jit-test/tests/asm.js/testFFI.js

@@ -19,7 +19,7 @@ function addN() {
         sum += arguments[i];
     return sum;
 }
-var imp = { inc:inc, add1:add1, add2:add2, add3:add3, addN:addN };
+var imp = { inc:inc, add1:add1, add2:add2, add3:add3, addN:addN, identity: x => x };
 
 assertAsmTypeFail('glob', 'imp', USE_ASM + 'var inc=imp.inc; function f() { incc() } return f');
 assertAsmTypeFail('glob', 'imp', USE_ASM + 'var inc=imp.inc; function f() { var i = 0; return (i + inc)|0 } return f');
@@ -90,3 +90,5 @@ var f = asmLink(asmCompile('glob', 'imp', USE_ASM + 'var ffi=imp.ffi; function g
 assertThrowsValue(function() { f(0,2.4) }, 2.4+4);
 assertThrowsValue(function() { f(1,2.4) }, 2.4+8);
 assertThrowsValue(function() { f(8,2.4) }, 2.4+36);
+
+assertEq(asmLink(asmCompile('glob', 'imp', USE_ASM + 'var identity=imp.identity; function g(x) { x=+x; return +identity(x) } return g'), null, imp)(13.37), 13.37);