Bug 1834478 - Add public API to test and clear errors on JS::FrontendContext. r=nbp

Differential Revision: https://phabricator.services.mozilla.com/D179428

js/public/experimental/CompileScript.h

@@ -36,6 +36,13 @@ JS_PUBLIC_API void DestroyFrontendContext(JS::FrontendContext* fc);
 JS_PUBLIC_API void SetNativeStackQuota(JS::FrontendContext* fc,
                                        JS::NativeStackSize stackSize);
 
+// Returns true if there was any error reported to given FrontendContext.
+JS_PUBLIC_API bool HadFrontendErrors(JS::FrontendContext* fc);
+
+// Clear errors reported to given FrontendContext.
+// No-op when there's no errors.
+JS_PUBLIC_API void ClearFrontendErrors(JS::FrontendContext* fc);
+
 /*
  * Set supported import assertions on a FrontendContext to be used with
  * CompileModuleScriptToStencil. May only be set once for each FrontendContext.

js/src/frontend/CompileScript.cpp

@@ -32,6 +32,14 @@ JS_PUBLIC_API void JS::SetNativeStackQuota(JS::FrontendContext* fc,
   fc->setStackQuota(stackSize);
 }
 
+JS_PUBLIC_API bool JS::HadFrontendErrors(JS::FrontendContext* fc) {
+  return fc->hadErrors();
+}
+
+JS_PUBLIC_API void JS::ClearFrontendErrors(JS::FrontendContext* fc) {
+  fc->clearErrors();
+}
+
 JS_PUBLIC_API bool JS::SetSupportedImportAssertions(
     FrontendContext* fc,
     const JS::ImportAssertionVector& supportedImportAssertions) {

js/src/frontend/FrontendContext.cpp

@@ -16,6 +16,14 @@
 
 using namespace js;
 
+void FrontendErrors::clearErrors() {
+  error.reset();
+  warnings.clear();
+  overRecursed = false;
+  outOfMemory = false;
+  allocationOverflow = false;
+}
+
 void FrontendAllocator::reportAllocationOverflow() {
   fc_->onAllocationOverflow();
 }
@@ -76,6 +84,11 @@ bool FrontendContext::hadErrors() const {
   return errors_.hadErrors();
 }
 
+void FrontendContext::clearErrors() {
+  MOZ_ASSERT(!maybeCx_);
+  return errors_.clearErrors();
+}
+
 void* FrontendContext::onOutOfMemory(AllocFunction allocFunc, arena_id_t arena,
                                      size_t nbytes, void* reallocPtr) {
   addPendingOutOfMemory();

js/src/frontend/FrontendContext.h

@@ -45,6 +45,8 @@ struct FrontendErrors {
   bool hadErrors() const {
     return outOfMemory || overRecursed || allocationOverflow || error;
   }
+
+  void clearErrors();
 };
 
 class FrontendAllocator : public MallocProvider<FrontendAllocator> {
@@ -167,6 +169,7 @@ class FrontendContext {
   bool hadOverRecursed() const { return errors_.overRecursed; }
   bool hadAllocationOverflow() const { return errors_.allocationOverflow; }
   bool hadErrors() const;
+  void clearErrors();
 
 #ifdef __wasi__
   void incWasiRecursionDepth();