Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 613 insertions, 0 deletions

diff --git a/js/src/vm/CompilationAndEvaluation.cpp b/js/src/vm/CompilationAndEvaluation.cpp
new file mode 100644
index 0000000000..786002beb0
--- /dev/null
+++ b/js/src/vm/CompilationAndEvaluation.cpp
@@ -0,0 +1,613 @@
+/* -*- 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/. */
+
+/* Same-thread compilation and evaluation APIs. */
+
+#include "js/CompilationAndEvaluation.h"
+
+#include "mozilla/Maybe.h"  // mozilla::None, mozilla::Some
+#include "mozilla/Utf8.h"   // mozilla::Utf8Unit
+
+#include <utility>  // std::move
+
+#include "jsapi.h"    // JS_WrapValue
+#include "jstypes.h"  // JS_PUBLIC_API
+
+#include "debugger/DebugAPI.h"
+#include "frontend/BytecodeCompilation.h"  // frontend::CompileGlobalScript
+#include "frontend/BytecodeCompiler.h"     // frontend::IsIdentifier
+#include "frontend/CompilationStencil.h"  // for frontened::{CompilationStencil, BorrowingCompilationStencil, CompilationGCOutput}
+#include "frontend/FrontendContext.h"     // js::AutoReportFrontendContext
+#include "frontend/Parser.h"       // frontend::Parser, frontend::ParseGoal
+#include "js/CharacterEncoding.h"  // JS::UTF8Chars, JS::UTF8CharsToNewTwoByteCharsZ
+#include "js/experimental/JSStencil.h"  // JS::Stencil
+#include "js/friend/ErrorMessages.h"    // js::GetErrorMessage, JSMSG_*
+#include "js/RootingAPI.h"              // JS::Rooted
+#include "js/SourceText.h"              // JS::SourceText
+#include "js/TypeDecls.h"          // JS::HandleObject, JS::MutableHandleScript
+#include "js/Utility.h"            // js::MallocArena, JS::UniqueTwoByteChars
+#include "js/Value.h"              // JS::Value
+#include "util/CompleteFile.h"     // js::FileContents, js::ReadCompleteFile
+#include "util/StringBuffer.h"     // js::StringBuffer
+#include "vm/EnvironmentObject.h"  // js::CreateNonSyntacticEnvironmentChain
+#include "vm/ErrorReporting.h"  // js::ErrorMetadata, js::ReportCompileErrorLatin1
+#include "vm/Interpreter.h"     // js::Execute
+#include "vm/JSContext.h"       // JSContext
+
+#include "vm/JSContext-inl.h"  // JSContext::check
+
+using mozilla::Utf8Unit;
+
+using JS::CompileOptions;
+using JS::HandleObject;
+using JS::ReadOnlyCompileOptions;
+using JS::SourceOwnership;
+using JS::SourceText;
+using JS::UniqueTwoByteChars;
+using JS::UTF8Chars;
+using JS::UTF8CharsToNewTwoByteCharsZ;
+
+using namespace js;
+
+JS_PUBLIC_API void JS::detail::ReportSourceTooLong(JSContext* cx) {
+  JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+                            JSMSG_SOURCE_TOO_LONG);
+}
+
+static void ReportSourceTooLongImpl(JS::FrontendContext* fc, ...) {
+  va_list args;
+  va_start(args, fc);
+
+  js::ErrorMetadata metadata;
+  metadata.filename = "<unknown>";
+  metadata.lineNumber = 0;
+  metadata.columnNumber = 0;
+  metadata.lineLength = 0;
+  metadata.tokenOffset = 0;
+  metadata.isMuted = false;
+
+  js::ReportCompileErrorLatin1(fc, std::move(metadata), nullptr,
+                               JSMSG_SOURCE_TOO_LONG, &args);
+
+  va_end(args);
+}
+
+JS_PUBLIC_API void JS::detail::ReportSourceTooLong(JS::FrontendContext* fc) {
+  ReportSourceTooLongImpl(fc);
+}
+
+template <typename Unit>
+static JSScript* CompileSourceBuffer(JSContext* cx,
+                                     const ReadOnlyCompileOptions& options,
+                                     SourceText<Unit>& srcBuf) {
+  ScopeKind scopeKind =
+      options.nonSyntacticScope ? ScopeKind::NonSyntactic : ScopeKind::Global;
+
+  MOZ_ASSERT(!cx->zone()->isAtomsZone());
+  AssertHeapIsIdle();
+  CHECK_THREAD(cx);
+
+  JS::Rooted<JSScript*> script(cx);
+  {
+    AutoReportFrontendContext fc(cx);
+    script = frontend::CompileGlobalScript(cx, &fc, options, srcBuf, scopeKind);
+  }
+  return script;
+}
+
+JSScript* JS::Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
+                      SourceText<char16_t>& srcBuf) {
+  return CompileSourceBuffer(cx, options, srcBuf);
+}
+
+JSScript* JS::Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
+                      SourceText<Utf8Unit>& srcBuf) {
+  return CompileSourceBuffer(cx, options, srcBuf);
+}
+
+JS_PUBLIC_API bool JS::StartIncrementalEncoding(JSContext* cx,
+                                                RefPtr<JS::Stencil>&& stencil) {
+  MOZ_ASSERT(cx);
+  MOZ_ASSERT(!stencil->hasMultipleReference());
+
+  auto* source = stencil->source.get();
+
+  UniquePtr<frontend::ExtensibleCompilationStencil> initial;
+  if (stencil->hasOwnedBorrow()) {
+    initial.reset(stencil->takeOwnedBorrow());
+    stencil = nullptr;
+  } else {
+    initial = cx->make_unique<frontend::ExtensibleCompilationStencil>(
+        stencil->source);
+    if (!initial) {
+      return false;
+    }
+
+    AutoReportFrontendContext fc(cx);
+    if (!initial->steal(&fc, std::move(stencil))) {
+      return false;
+    }
+  }
+
+  return source->startIncrementalEncoding(cx, std::move(initial));
+}
+
+JSScript* JS::CompileUtf8File(JSContext* cx,
+                              const ReadOnlyCompileOptions& options,
+                              FILE* file) {
+  FileContents buffer(cx);
+  if (!ReadCompleteFile(cx, file, buffer)) {
+    return nullptr;
+  }
+
+  SourceText<Utf8Unit> srcBuf;
+  if (!srcBuf.init(cx, reinterpret_cast<const char*>(buffer.begin()),
+                   buffer.length(), SourceOwnership::Borrowed)) {
+    return nullptr;
+  }
+
+  return CompileSourceBuffer(cx, options, srcBuf);
+}
+
+JSScript* JS::CompileUtf8Path(JSContext* cx,
+                              const ReadOnlyCompileOptions& optionsArg,
+                              const char* filename) {
+  AutoFile file;
+  if (!file.open(cx, filename)) {
+    return nullptr;
+  }
+
+  CompileOptions options(cx, optionsArg);
+  options.setFileAndLine(filename, 1);
+  return CompileUtf8File(cx, options, file.fp());
+}
+
+JS_PUBLIC_API bool JS_Utf8BufferIsCompilableUnit(JSContext* cx,
+                                                 HandleObject obj,
+                                                 const char* utf8,
+                                                 size_t length) {
+  AssertHeapIsIdle();
+  CHECK_THREAD(cx);
+  cx->check(obj);
+
+  cx->clearPendingException();
+
+  JS::UniqueTwoByteChars chars{
+      UTF8CharsToNewTwoByteCharsZ(cx, UTF8Chars(utf8, length), &length,
+                                  js::MallocArena)
+          .get()};
+  if (!chars) {
+    return true;
+  }
+
+  // Return true on any out-of-memory error or non-EOF-related syntax error, so
+  // our caller doesn't try to collect more buffered source.
+  bool result = true;
+
+  using frontend::FullParseHandler;
+  using frontend::ParseGoal;
+  using frontend::Parser;
+
+  AutoReportFrontendContext fc(cx,
+                               AutoReportFrontendContext::Warning::Suppress);
+  CompileOptions options(cx);
+  Rooted<frontend::CompilationInput> input(cx,
+                                           frontend::CompilationInput(options));
+  if (!input.get().initForGlobal(&fc)) {
+    return false;
+  }
+
+  LifoAllocScope allocScope(&cx->tempLifoAlloc());
+  js::frontend::NoScopeBindingCache scopeCache;
+  frontend::CompilationState compilationState(&fc, allocScope, input.get());
+  if (!compilationState.init(&fc, &scopeCache)) {
+    return false;
+  }
+
+  Parser<FullParseHandler, char16_t> parser(&fc, options, chars.get(), length,
+                                            /* foldConstants = */ true,
+                                            compilationState,
+                                            /* syntaxParser = */ nullptr);
+  if (!parser.checkOptions() || !parser.parse()) {
+    // We ran into an error. If it was because we ran out of source, we
+    // return false so our caller knows to try to collect more buffered
+    // source.
+    if (parser.isUnexpectedEOF()) {
+      result = false;
+    }
+
+    cx->clearPendingException();
+  }
+
+  return result;
+}
+
+class FunctionCompiler {
+ private:
+  JSContext* const cx_;
+  Rooted<JSAtom*> nameAtom_;
+  StringBuffer funStr_;
+
+  uint32_t parameterListEnd_ = 0;
+  bool nameIsIdentifier_ = true;
+
+ public:
+  explicit FunctionCompiler(JSContext* cx, FrontendContext* fc)
+      : cx_(cx), nameAtom_(cx), funStr_(fc) {
+    AssertHeapIsIdle();
+    CHECK_THREAD(cx);
+    MOZ_ASSERT(!cx->zone()->isAtomsZone());
+  }
+
+  [[nodiscard]] bool init(const char* name, unsigned nargs,
+                          const char* const* argnames) {
+    if (!funStr_.ensureTwoByteChars()) {
+      return false;
+    }
+    if (!funStr_.append("function ")) {
+      return false;
+    }
+
+    if (name) {
+      size_t nameLen = strlen(name);
+
+      nameAtom_ = Atomize(cx_, name, nameLen);
+      if (!nameAtom_) {
+        return false;
+      }
+
+      // If the name is an identifier, we can just add it to source text.
+      // Otherwise we'll have to set it manually later.
+      nameIsIdentifier_ = js::frontend::IsIdentifier(
+          reinterpret_cast<const Latin1Char*>(name), nameLen);
+      if (nameIsIdentifier_) {
+        if (!funStr_.append(nameAtom_)) {
+          return false;
+        }
+      }
+    }
+
+    if (!funStr_.append("(")) {
+      return false;
+    }
+
+    for (unsigned i = 0; i < nargs; i++) {
+      if (i != 0) {
+        if (!funStr_.append(", ")) {
+          return false;
+        }
+      }
+      if (!funStr_.append(argnames[i], strlen(argnames[i]))) {
+        return false;
+      }
+    }
+
+    // Remember the position of ")".
+    parameterListEnd_ = funStr_.length();
+    static_assert(FunctionConstructorMedialSigils[0] == ')');
+
+    return funStr_.append(FunctionConstructorMedialSigils.data(),
+                          FunctionConstructorMedialSigils.length());
+  }
+
+  template <typename Unit>
+  [[nodiscard]] inline bool addFunctionBody(const SourceText<Unit>& srcBuf) {
+    return funStr_.append(srcBuf.get(), srcBuf.length());
+  }
+
+  JSFunction* finish(HandleObjectVector envChain,
+                     const ReadOnlyCompileOptions& optionsArg) {
+    using js::frontend::FunctionSyntaxKind;
+
+    if (!funStr_.append(FunctionConstructorFinalBrace.data(),
+                        FunctionConstructorFinalBrace.length())) {
+      return nullptr;
+    }
+
+    size_t newLen = funStr_.length();
+    UniqueTwoByteChars stolen(funStr_.stealChars());
+    if (!stolen) {
+      return nullptr;
+    }
+
+    SourceText<char16_t> newSrcBuf;
+    if (!newSrcBuf.init(cx_, std::move(stolen), newLen)) {
+      return nullptr;
+    }
+
+    RootedObject enclosingEnv(cx_);
+    ScopeKind kind;
+    if (envChain.empty()) {
+      // A compiled function has a burned-in environment chain, so if no exotic
+      // environment was requested, we can use the global lexical environment
+      // directly and not need to worry about any potential non-syntactic scope.
+      enclosingEnv.set(&cx_->global()->lexicalEnvironment());
+      kind = ScopeKind::Global;
+    } else {
+      if (!CreateNonSyntacticEnvironmentChain(cx_, envChain, &enclosingEnv)) {
+        return nullptr;
+      }
+      kind = ScopeKind::NonSyntactic;
+    }
+
+    cx_->check(enclosingEnv);
+
+    // Make sure the static scope chain matches up when we have a
+    // non-syntactic scope.
+    MOZ_ASSERT_IF(!IsGlobalLexicalEnvironment(enclosingEnv),
+                  kind == ScopeKind::NonSyntactic);
+
+    CompileOptions options(cx_, optionsArg);
+    options.setNonSyntacticScope(kind == ScopeKind::NonSyntactic);
+
+    FunctionSyntaxKind syntaxKind = FunctionSyntaxKind::Statement;
+    RootedFunction fun(cx_);
+    if (kind == ScopeKind::NonSyntactic) {
+      Rooted<Scope*> enclosingScope(
+          cx_, GlobalScope::createEmpty(cx_, ScopeKind::NonSyntactic));
+      if (!enclosingScope) {
+        return nullptr;
+      }
+
+      fun = js::frontend::CompileStandaloneFunctionInNonSyntacticScope(
+          cx_, options, newSrcBuf, mozilla::Some(parameterListEnd_), syntaxKind,
+          enclosingScope);
+    } else {
+      fun = js::frontend::CompileStandaloneFunction(
+          cx_, options, newSrcBuf, mozilla::Some(parameterListEnd_),
+          syntaxKind);
+    }
+    if (!fun) {
+      return nullptr;
+    }
+
+    // When the function name isn't a valid identifier, the generated function
+    // source in srcBuf won't include the name, so name the function manually.
+    if (!nameIsIdentifier_) {
+      fun->setAtom(nameAtom_);
+    }
+
+    if (fun->isInterpreted()) {
+      fun->initEnvironment(enclosingEnv);
+    }
+
+    return fun;
+  }
+};
+
+JS_PUBLIC_API JSFunction* JS::CompileFunction(
+    JSContext* cx, HandleObjectVector envChain,
+    const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
+    const char* const* argnames, SourceText<char16_t>& srcBuf) {
+  ManualReportFrontendContext fc(cx);
+  FunctionCompiler compiler(cx, &fc);
+  if (!compiler.init(name, nargs, argnames) ||
+      !compiler.addFunctionBody(srcBuf)) {
+    fc.failure();
+    return nullptr;
+  }
+
+  fc.ok();
+  return compiler.finish(envChain, options);
+}
+
+JS_PUBLIC_API JSFunction* JS::CompileFunction(
+    JSContext* cx, HandleObjectVector envChain,
+    const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
+    const char* const* argnames, SourceText<Utf8Unit>& srcBuf) {
+  ManualReportFrontendContext fc(cx);
+  FunctionCompiler compiler(cx, &fc);
+  if (!compiler.init(name, nargs, argnames) ||
+      !compiler.addFunctionBody(srcBuf)) {
+    fc.failure();
+    return nullptr;
+  }
+
+  fc.ok();
+  return compiler.finish(envChain, options);
+}
+
+JS_PUBLIC_API JSFunction* JS::CompileFunctionUtf8(
+    JSContext* cx, HandleObjectVector envChain,
+    const ReadOnlyCompileOptions& options, const char* name, unsigned nargs,
+    const char* const* argnames, const char* bytes, size_t length) {
+  SourceText<Utf8Unit> srcBuf;
+  if (!srcBuf.init(cx, bytes, length, SourceOwnership::Borrowed)) {
+    return nullptr;
+  }
+
+  return CompileFunction(cx, envChain, options, name, nargs, argnames, srcBuf);
+}
+
+JS_PUBLIC_API void JS::ExposeScriptToDebugger(JSContext* cx,
+                                              HandleScript script) {
+  MOZ_ASSERT(cx);
+  MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
+
+  DebugAPI::onNewScript(cx, script);
+}
+
+JS_PUBLIC_API bool JS::UpdateDebugMetadata(
+    JSContext* cx, Handle<JSScript*> script, const InstantiateOptions& options,
+    HandleValue privateValue, HandleString elementAttributeName,
+    HandleScript introScript, HandleScript scriptOrModule) {
+  Rooted<ScriptSourceObject*> sso(cx, script->sourceObject());
+
+  if (!ScriptSourceObject::initElementProperties(cx, sso,
+                                                 elementAttributeName)) {
+    return false;
+  }
+
+  // There is no equivalent of cross-compartment wrappers for scripts. If the
+  // introduction script and ScriptSourceObject are in different compartments,
+  // we would be creating a cross-compartment script reference, which is
+  // forbidden. We can still store a CCW to the script source object though.
+  RootedValue introductionScript(cx);
+  if (introScript) {
+    if (introScript->compartment() == cx->compartment()) {
+      introductionScript.setPrivateGCThing(introScript);
+    }
+  }
+  sso->setIntroductionScript(introductionScript);
+
+  RootedValue privateValueStore(cx, UndefinedValue());
+  if (privateValue.isUndefined()) {
+    // Set the private value to that of the script or module that this source is
+    // part of, if any.
+    if (scriptOrModule) {
+      privateValueStore = scriptOrModule->sourceObject()->getPrivate();
+    }
+  } else {
+    privateValueStore = privateValue;
+  }
+
+  if (!privateValueStore.isUndefined()) {
+    if (!JS_WrapValue(cx, &privateValueStore)) {
+      return false;
+    }
+  }
+  sso->setPrivate(cx->runtime(), privateValueStore);
+
+  if (!options.hideScriptFromDebugger) {
+    JS::ExposeScriptToDebugger(cx, script);
+  }
+
+  return true;
+}
+
+MOZ_NEVER_INLINE static bool ExecuteScript(JSContext* cx, HandleObject envChain,
+                                           HandleScript script,
+                                           MutableHandleValue rval) {
+  MOZ_ASSERT(!cx->zone()->isAtomsZone());
+  AssertHeapIsIdle();
+  CHECK_THREAD(cx);
+  cx->check(envChain, script);
+
+  if (!IsGlobalLexicalEnvironment(envChain)) {
+    MOZ_RELEASE_ASSERT(script->hasNonSyntacticScope());
+  }
+
+  return Execute(cx, script, envChain, rval);
+}
+
+static bool ExecuteScript(JSContext* cx, HandleObjectVector envChain,
+                          HandleScript script, MutableHandleValue rval) {
+  RootedObject env(cx);
+  if (!CreateNonSyntacticEnvironmentChain(cx, envChain, &env)) {
+    return false;
+  }
+
+  return ExecuteScript(cx, env, script, rval);
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
+                                                     HandleScript scriptArg,
+                                                     MutableHandleValue rval) {
+  RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+  return ExecuteScript(cx, globalLexical, scriptArg, rval);
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API bool JS_ExecuteScript(JSContext* cx,
+                                                     HandleScript scriptArg) {
+  RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+  RootedValue rval(cx);
+  return ExecuteScript(cx, globalLexical, scriptArg, &rval);
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API bool JS_ExecuteScript(
+    JSContext* cx, HandleObjectVector envChain, HandleScript scriptArg,
+    MutableHandleValue rval) {
+  return ExecuteScript(cx, envChain, scriptArg, rval);
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API bool JS_ExecuteScript(
+    JSContext* cx, HandleObjectVector envChain, HandleScript scriptArg) {
+  RootedValue rval(cx);
+  return ExecuteScript(cx, envChain, scriptArg, &rval);
+}
+
+template <typename Unit>
+static bool EvaluateSourceBuffer(JSContext* cx, ScopeKind scopeKind,
+                                 Handle<JSObject*> env,
+                                 const ReadOnlyCompileOptions& optionsArg,
+                                 SourceText<Unit>& srcBuf,
+                                 MutableHandle<Value> rval) {
+  CompileOptions options(cx, optionsArg);
+  MOZ_ASSERT(!cx->zone()->isAtomsZone());
+  AssertHeapIsIdle();
+  CHECK_THREAD(cx);
+  cx->check(env);
+  MOZ_ASSERT_IF(!IsGlobalLexicalEnvironment(env),
+                scopeKind == ScopeKind::NonSyntactic);
+
+  options.setNonSyntacticScope(scopeKind == ScopeKind::NonSyntactic);
+  options.setIsRunOnce(true);
+
+  AutoReportFrontendContext fc(cx);
+  RootedScript script(
+      cx, frontend::CompileGlobalScript(cx, &fc, options, srcBuf, scopeKind));
+  if (!script) {
+    return false;
+  }
+
+  return Execute(cx, script, env, rval);
+}
+
+JS_PUBLIC_API bool JS::Evaluate(JSContext* cx,
+                                const ReadOnlyCompileOptions& options,
+                                SourceText<Utf8Unit>& srcBuf,
+                                MutableHandle<Value> rval) {
+  RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+  return EvaluateSourceBuffer(cx, ScopeKind::Global, globalLexical, options,
+                              srcBuf, rval);
+}
+
+JS_PUBLIC_API bool JS::Evaluate(JSContext* cx,
+                                const ReadOnlyCompileOptions& optionsArg,
+                                SourceText<char16_t>& srcBuf,
+                                MutableHandleValue rval) {
+  RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+  return EvaluateSourceBuffer(cx, ScopeKind::Global, globalLexical, optionsArg,
+                              srcBuf, rval);
+}
+
+JS_PUBLIC_API bool JS::Evaluate(JSContext* cx, HandleObjectVector envChain,
+                                const ReadOnlyCompileOptions& options,
+                                SourceText<char16_t>& srcBuf,
+                                MutableHandleValue rval) {
+  RootedObject env(cx);
+  if (!CreateNonSyntacticEnvironmentChain(cx, envChain, &env)) {
+    return false;
+  }
+
+  return EvaluateSourceBuffer(cx, ScopeKind::NonSyntactic, env, options, srcBuf,
+                              rval);
+}
+
+JS_PUBLIC_API bool JS::EvaluateUtf8Path(
+    JSContext* cx, const ReadOnlyCompileOptions& optionsArg,
+    const char* filename, MutableHandleValue rval) {
+  FileContents buffer(cx);
+  {
+    AutoFile file;
+    if (!file.open(cx, filename) || !file.readAll(cx, buffer)) {
+      return false;
+    }
+  }
+
+  CompileOptions options(cx, optionsArg);
+  options.setFileAndLine(filename, 1);
+
+  auto contents = reinterpret_cast<const char*>(buffer.begin());
+  size_t length = buffer.length();
+
+  JS::SourceText<Utf8Unit> srcBuf;
+  if (!srcBuf.init(cx, contents, length, JS::SourceOwnership::Borrowed)) {
+    return false;
+  }
+
+  return Evaluate(cx, options, srcBuf, rval);
+}