Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/js/src/frontend/CompileScript.cpp b/js/src/frontend/CompileScript.cpp
new file mode 100644
index 0000000000..0c75b40ccb
--- /dev/null
+++ b/js/src/frontend/CompileScript.cpp
@@ -0,0 +1,175 @@
+/* -*- 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 "js/experimental/CompileScript.h"
+
+#include "frontend/BytecodeCompilation.h"  // frontend::CompileGlobalScriptToStencil
+#include "frontend/BytecodeCompiler.h"  // frontend::ParseModuleToStencil
+#include "frontend/CompilationStencil.h"  // frontend::{CompilationStencil,CompilationInput}
+#include "frontend/FrontendContext.h"    // frontend::FrontendContext
+#include "frontend/ScopeBindingCache.h"  // frontend::NoScopeBindingCache
+#include "js/SourceText.h"               // JS::SourceText
+
+using namespace js;
+using namespace js::frontend;
+
+JS_PUBLIC_API FrontendContext* JS::NewFrontendContext() {
+  MOZ_ASSERT(JS::detail::libraryInitState == JS::detail::InitState::Running,
+             "must call JS_Init prior to creating any FrontendContexts");
+
+  return js::NewFrontendContext();
+}
+
+JS_PUBLIC_API void JS::DestroyFrontendContext(FrontendContext* fc) {
+  return js::DestroyFrontendContext(fc);
+}
+
+JS_PUBLIC_API void JS::SetNativeStackQuota(JS::FrontendContext* fc,
+                                           JS::NativeStackSize stackSize) {
+  fc->setStackQuota(stackSize);
+}
+
+JS_PUBLIC_API bool JS::SetSupportedImportAssertions(
+    FrontendContext* fc,
+    const JS::ImportAssertionVector& supportedImportAssertions) {
+  return fc->setSupportedImportAssertions(supportedImportAssertions);
+}
+
+JS::CompilationStorage::~CompilationStorage() {
+  if (input_ && !isBorrowed_) {
+    js_delete(input_);
+    input_ = nullptr;
+  }
+}
+
+size_t JS::CompilationStorage::sizeOfIncludingThis(
+    mozilla::MallocSizeOf mallocSizeOf) const {
+  size_t sizeOfCompilationInput =
+      input_ ? input_->sizeOfExcludingThis(mallocSizeOf) : 0;
+  return mallocSizeOf(this) + sizeOfCompilationInput;
+}
+
+bool JS::CompilationStorage::allocateInput(
+    FrontendContext* fc, const JS::ReadOnlyCompileOptions& options) {
+  MOZ_ASSERT(!input_);
+  input_ = fc->getAllocator()->new_<frontend::CompilationInput>(options);
+  return !!input_;
+}
+
+void JS::CompilationStorage::trace(JSTracer* trc) {
+  if (input_) {
+    input_->trace(trc);
+  }
+}
+
+template <typename CharT>
+static already_AddRefed<JS::Stencil> CompileGlobalScriptToStencilImpl(
+    JS::FrontendContext* fc, const JS::ReadOnlyCompileOptions& options,
+    JS::SourceText<CharT>& srcBuf, JS::CompilationStorage& compilationStorage) {
+  ScopeKind scopeKind =
+      options.nonSyntacticScope ? ScopeKind::NonSyntactic : ScopeKind::Global;
+
+  JS::SourceText<CharT> data(std::move(srcBuf));
+
+  compilationStorage.allocateInput(fc, options);
+  if (!compilationStorage.hasInput()) {
+    return nullptr;
+  }
+
+  frontend::NoScopeBindingCache scopeCache;
+  LifoAlloc tempLifoAlloc(JSContext::TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE);
+  RefPtr<frontend::CompilationStencil> stencil_ =
+      frontend::CompileGlobalScriptToStencil(nullptr, fc, tempLifoAlloc,
+                                             compilationStorage.getInput(),
+                                             &scopeCache, data, scopeKind);
+  return stencil_.forget();
+}
+
+template <typename CharT>
+static already_AddRefed<JS::Stencil> CompileModuleScriptToStencilImpl(
+    JS::FrontendContext* fc, const JS::ReadOnlyCompileOptions& optionsInput,
+    JS::SourceText<CharT>& srcBuf, JS::CompilationStorage& compilationStorage) {
+  JS::CompileOptions options(nullptr, optionsInput);
+  options.setModule();
+
+  compilationStorage.allocateInput(fc, options);
+  if (!compilationStorage.hasInput()) {
+    return nullptr;
+  }
+
+  NoScopeBindingCache scopeCache;
+  js::LifoAlloc tempLifoAlloc(JSContext::TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE);
+  RefPtr<JS::Stencil> stencil =
+      ParseModuleToStencil(nullptr, fc, tempLifoAlloc,
+                           compilationStorage.getInput(), &scopeCache, srcBuf);
+  if (!stencil) {
+    return nullptr;
+  }
+
+  // Convert the UniquePtr to a RefPtr and increment the count (to 1).
+  return stencil.forget();
+}
+
+already_AddRefed<JS::Stencil> JS::CompileGlobalScriptToStencil(
+    JS::FrontendContext* fc, const JS::ReadOnlyCompileOptions& options,
+    JS::SourceText<mozilla::Utf8Unit>& srcBuf,
+    JS::CompilationStorage& compileStorage) {
+  return CompileGlobalScriptToStencilImpl(fc, options, srcBuf, compileStorage);
+}
+
+already_AddRefed<JS::Stencil> JS::CompileGlobalScriptToStencil(
+    JS::FrontendContext* fc, const JS::ReadOnlyCompileOptions& options,
+    JS::SourceText<char16_t>& srcBuf, JS::CompilationStorage& compileStorage) {
+  return CompileGlobalScriptToStencilImpl(fc, options, srcBuf, compileStorage);
+}
+
+already_AddRefed<JS::Stencil> JS::CompileModuleScriptToStencil(
+    JS::FrontendContext* fc, const JS::ReadOnlyCompileOptions& optionsInput,
+    JS::SourceText<mozilla::Utf8Unit>& srcBuf,
+    JS::CompilationStorage& compileStorage) {
+  return CompileModuleScriptToStencilImpl(fc, optionsInput, srcBuf,
+                                          compileStorage);
+}
+
+already_AddRefed<JS::Stencil> JS::CompileModuleScriptToStencil(
+    JS::FrontendContext* fc, const JS::ReadOnlyCompileOptions& optionsInput,
+    JS::SourceText<char16_t>& srcBuf, JS::CompilationStorage& compileStorage) {
+  return CompileModuleScriptToStencilImpl(fc, optionsInput, srcBuf,
+                                          compileStorage);
+}
+
+#ifdef DEBUG
+// We don't need to worry about GC if the CompilationInput has no GC pointers
+static bool isGCSafe(js::frontend::CompilationInput& input) {
+  bool isGlobalOrModule =
+      input.target == CompilationInput::CompilationTarget::Global ||
+      input.target == CompilationInput::CompilationTarget::Module;
+  bool scopeHasNoGC =
+      input.enclosingScope.isStencil() || input.enclosingScope.isNull();
+  bool scriptHasNoGC =
+      input.lazyOuterScript().isStencil() || input.lazyOuterScript().isNull();
+  bool cacheHasNoGC = input.atomCache.empty();
+
+  return isGlobalOrModule && scopeHasNoGC && scriptHasNoGC && cacheHasNoGC;
+}
+#endif  // DEBUG
+
+bool JS::PrepareForInstantiate(JS::FrontendContext* fc,
+                               JS::CompilationStorage& compileStorage,
+                               JS::Stencil& stencil,
+                               JS::InstantiationStorage& storage) {
+  MOZ_ASSERT(compileStorage.hasInput());
+  MOZ_ASSERT(isGCSafe(compileStorage.getInput()));
+  if (!storage.gcOutput_) {
+    storage.gcOutput_ =
+        fc->getAllocator()->new_<js::frontend::CompilationGCOutput>();
+    if (!storage.gcOutput_) {
+      return false;
+    }
+  }
+  return CompilationStencil::prepareForInstantiate(
+      fc, compileStorage.getInput().atomCache, stencil, *storage.gcOutput_);
+}