Bug 1211962 - addNativeToBytecodeEntry: Check that the masm.currentOffset() returns a valid result. r=djvj

js/src/jit-test/tests/profiler/bug1211962.js

@@ -0,0 +1,11 @@
+// |jit-test| slow;
+load(libdir + "oomTest.js");
+
+enableSPSProfiling();
+var lfGlobal = newGlobal();
+for (lfLocal in this) {
+    lfGlobal[lfLocal] = this[lfLocal];
+}
+const script = 'oomTest(() => getBacktrace({args: true, locals: "123795", thisprops: true}));';
+lfGlobal.offThreadCompileScript(script);
+lfGlobal.runOffThreadScript();

js/src/jit/shared/CodeGenerator-shared.cpp

@@ -208,6 +208,11 @@ CodeGeneratorShared::addNativeToBytecodeEntry(const BytecodeSite* site)
     if (!isProfilerInstrumentationEnabled())
         return true;
 
+    // Fails early if the last added instruction caused the macro assembler to
+    // run out of memory as continuity assumption below do not hold.
+    if (masm.oom())
+        return false;
+
     MOZ_ASSERT(site);
     MOZ_ASSERT(site->tree());
     MOZ_ASSERT(site->pc());