summaryrefslogtreecommitdiffstats
path: root/js/src/frontend/FrontendContext.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--js/src/frontend/FrontendContext.cpp237
1 files changed, 237 insertions, 0 deletions
diff --git a/js/src/frontend/FrontendContext.cpp b/js/src/frontend/FrontendContext.cpp
new file mode 100644
index 0000000000..c9f1bf75b4
--- /dev/null
+++ b/js/src/frontend/FrontendContext.cpp
@@ -0,0 +1,237 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "frontend/FrontendContext.h"
+
+#include "gc/GC.h"
+#include "js/AllocPolicy.h" // js::ReportOutOfMemory
+#include "js/friend/StackLimits.h" // js::ReportOverRecursed
+#include "js/Modules.h"
+#include "util/DifferentialTesting.h"
+#include "util/NativeStack.h" // GetNativeStackBase
+#include "vm/JSContext.h"
+
+using namespace js;
+
+void FrontendAllocator::reportAllocationOverflow() {
+ fc_->onAllocationOverflow();
+}
+
+void* FrontendAllocator::onOutOfMemory(AllocFunction allocFunc,
+ arena_id_t arena, size_t nbytes,
+ void* reallocPtr) {
+ return fc_->onOutOfMemory(allocFunc, arena, nbytes, reallocPtr);
+}
+
+FrontendContext::~FrontendContext() {
+ if (ownNameCollectionPool_) {
+ MOZ_ASSERT(nameCollectionPool_);
+ js_delete(nameCollectionPool_);
+ }
+}
+
+bool FrontendContext::setSupportedImportAssertions(
+ const JS::ImportAssertionVector& supportedImportAssertions) {
+ MOZ_ASSERT(supportedImportAssertions_.empty());
+ if (!supportedImportAssertions_.appendAll(supportedImportAssertions)) {
+ ReportOutOfMemory();
+ return false;
+ }
+ return true;
+}
+
+void FrontendContext::setStackQuota(JS::NativeStackSize stackSize) {
+#ifdef __wasi__
+ stackLimit_ = JS::WASINativeStackLimit;
+#else // __wasi__
+ if (stackSize == 0) {
+ stackLimit_ = JS::NativeStackLimitMax;
+ } else {
+ stackLimit_ = JS::GetNativeStackLimit(GetNativeStackBase(), stackSize - 1);
+ }
+#endif // !__wasi__
+}
+
+bool FrontendContext::allocateOwnedPool() {
+ MOZ_ASSERT(!nameCollectionPool_);
+
+ nameCollectionPool_ = js_new<frontend::NameCollectionPool>();
+ if (!nameCollectionPool_) {
+ return false;
+ }
+ ownNameCollectionPool_ = true;
+ return true;
+}
+
+bool FrontendContext::hadErrors() const {
+ if (maybeCx_) {
+ if (maybeCx_->isExceptionPending()) {
+ return true;
+ }
+ }
+
+ return errors_.hadErrors();
+}
+
+void* FrontendContext::onOutOfMemory(AllocFunction allocFunc, arena_id_t arena,
+ size_t nbytes, void* reallocPtr) {
+ addPendingOutOfMemory();
+ return nullptr;
+}
+
+void FrontendContext::onAllocationOverflow() {
+ errors_.allocationOverflow = true;
+}
+
+void FrontendContext::onOutOfMemory() { addPendingOutOfMemory(); }
+
+void FrontendContext::onOverRecursed() { errors_.overRecursed = true; }
+
+void FrontendContext::recoverFromOutOfMemory() {
+ // TODO: Remove this branch once error report directly against JSContext is
+ // removed from the frontend code.
+ if (maybeCx_) {
+ maybeCx_->recoverFromOutOfMemory();
+ }
+
+ errors_.outOfMemory = false;
+}
+
+const JSErrorFormatString* FrontendContext::gcSafeCallback(
+ JSErrorCallback callback, void* userRef, const unsigned errorNumber) {
+ mozilla::Maybe<gc::AutoSuppressGC> suppressGC;
+ if (maybeCx_) {
+ suppressGC.emplace(maybeCx_);
+ }
+
+ return callback(userRef, errorNumber);
+}
+
+void FrontendContext::reportError(CompileError&& err) {
+ if (errors_.error) {
+ errors_.error.reset();
+ }
+
+ // When compiling off thread, save the error so that the thread finishing the
+ // parse can report it later.
+ errors_.error.emplace(std::move(err));
+}
+
+bool FrontendContext::reportWarning(CompileError&& err) {
+ if (!errors_.warnings.append(std::move(err))) {
+ ReportOutOfMemory();
+ return false;
+ }
+
+ return true;
+}
+
+void FrontendContext::ReportOutOfMemory() {
+ /*
+ * OOMs are non-deterministic, especially across different execution modes
+ * (e.g. interpreter vs JIT). When doing differential testing, print to
+ * stderr so that the fuzzers can detect this.
+ */
+ if (SupportDifferentialTesting()) {
+ fprintf(stderr, "ReportOutOfMemory called\n");
+ }
+
+ addPendingOutOfMemory();
+}
+
+void FrontendContext::addPendingOutOfMemory() { errors_.outOfMemory = true; }
+
+void FrontendContext::setCurrentJSContext(JSContext* cx) {
+ MOZ_ASSERT(!nameCollectionPool_);
+
+ maybeCx_ = cx;
+ nameCollectionPool_ = &cx->frontendCollectionPool();
+ scriptDataTableHolder_ = &cx->runtime()->scriptDataTableHolder();
+ stackLimit_ = cx->stackLimitForCurrentPrincipal();
+}
+
+bool FrontendContext::convertToRuntimeError(
+ JSContext* cx, Warning warning /* = Warning::Report */) {
+ // Report out of memory errors eagerly, or errors could be malformed.
+ if (hadOutOfMemory()) {
+ js::ReportOutOfMemory(cx);
+ return false;
+ }
+
+ if (maybeError()) {
+ if (!maybeError()->throwError(cx)) {
+ return false;
+ }
+ }
+ if (warning == Warning::Report) {
+ for (CompileError& error : warnings()) {
+ if (!error.throwError(cx)) {
+ return false;
+ }
+ }
+ }
+ if (hadOverRecursed()) {
+ js::ReportOverRecursed(cx);
+ }
+ if (hadAllocationOverflow()) {
+ js::ReportAllocationOverflow(cx);
+ }
+ return true;
+}
+
+void FrontendContext::linkWithJSContext(JSContext* cx) {
+ if (cx) {
+ cx->setFrontendErrors(&errors_);
+ }
+}
+
+#ifdef __wasi__
+void FrontendContext::incWasiRecursionDepth() {
+ if (maybeCx_) {
+ IncWasiRecursionDepth(maybeCx_);
+ }
+}
+
+void FrontendContext::decWasiRecursionDepth() {
+ if (maybeCx_) {
+ DecWasiRecursionDepth(maybeCx_);
+ }
+}
+
+bool FrontendContext::checkWasiRecursionLimit() {
+ if (maybeCx_) {
+ return CheckWasiRecursionLimit(maybeCx_);
+ }
+ return true;
+}
+
+JS_PUBLIC_API void js::IncWasiRecursionDepth(FrontendContext* fc) {
+ fc->incWasiRecursionDepth();
+}
+
+JS_PUBLIC_API void js::DecWasiRecursionDepth(FrontendContext* fc) {
+ fc->decWasiRecursionDepth();
+}
+
+JS_PUBLIC_API bool js::CheckWasiRecursionLimit(FrontendContext* fc) {
+ return fc->checkWasiRecursionLimit();
+}
+#endif // __wasi__
+
+FrontendContext* js::NewFrontendContext() {
+ UniquePtr<FrontendContext> fc = MakeUnique<FrontendContext>();
+ if (!fc) {
+ return nullptr;
+ }
+
+ if (!fc->allocateOwnedPool()) {
+ return nullptr;
+ }
+
+ return fc.release();
+}
+
+void js::DestroyFrontendContext(FrontendContext* fc) { js_delete_poison(fc); }