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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_OBJECTS_SCRIPT_H_
#define V8_OBJECTS_SCRIPT_H_
#include <memory>
#include "src/base/export-template.h"
#include "src/objects/fixed-array.h"
#include "src/objects/objects.h"
#include "src/objects/struct.h"
#include "torque-generated/bit-fields.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
class FunctionLiteral;
#include "torque-generated/src/objects/script-tq.inc"
// Script describes a script which has been added to the VM.
class Script : public TorqueGeneratedScript<Script, Struct> {
public:
// Script ID used for temporary scripts, which shouldn't be added to the
// script list.
static constexpr int kTemporaryScriptId = -2;
NEVER_READ_ONLY_SPACE
// Script types.
enum Type {
TYPE_NATIVE = 0,
TYPE_EXTENSION = 1,
TYPE_NORMAL = 2,
#if V8_ENABLE_WEBASSEMBLY
TYPE_WASM = 3,
#endif // V8_ENABLE_WEBASSEMBLY
TYPE_INSPECTOR = 4,
TYPE_WEB_SNAPSHOT = 5
};
// Script compilation types.
enum CompilationType { COMPILATION_TYPE_HOST = 0, COMPILATION_TYPE_EVAL = 1 };
// Script compilation state.
enum CompilationState {
COMPILATION_STATE_INITIAL = 0,
COMPILATION_STATE_COMPILED = 1
};
// [type]: the script type.
DECL_INT_ACCESSORS(type)
DECL_ACCESSORS(eval_from_shared_or_wrapped_arguments_or_sfi_table, Object)
// [eval_from_shared]: for eval scripts the shared function info for the
// function from which eval was called.
DECL_ACCESSORS(eval_from_shared, SharedFunctionInfo)
// [wrapped_arguments]: for the list of arguments in a wrapped script.
DECL_ACCESSORS(wrapped_arguments, FixedArray)
// For web snapshots: a hash table mapping function positions to indices in
// shared_function_infos.
// TODO(v8:11525): Replace with a more efficient data structure mapping
// function positions to weak pointers to SharedFunctionInfos directly.
DECL_ACCESSORS(shared_function_info_table, ObjectHashTable)
// Whether the script is implicitly wrapped in a function.
inline bool is_wrapped() const;
// Whether the eval_from_shared field is set with a shared function info
// for the eval site.
inline bool has_eval_from_shared() const;
// [eval_from_position]: the source position in the code for the function
// from which eval was called, as positive integer. Or the code offset in the
// code from which eval was called, as negative integer.
DECL_INT_ACCESSORS(eval_from_position)
// [shared_function_infos]: weak fixed array containing all shared
// function infos created from this script.
DECL_ACCESSORS(shared_function_infos, WeakFixedArray)
inline int shared_function_info_count() const;
#if V8_ENABLE_WEBASSEMBLY
// [wasm_breakpoint_infos]: the list of {BreakPointInfo} objects describing
// all WebAssembly breakpoints for modules/instances managed via this script.
// This must only be called if the type of this script is TYPE_WASM.
DECL_ACCESSORS(wasm_breakpoint_infos, FixedArray)
inline bool has_wasm_breakpoint_infos() const;
// [wasm_native_module]: the wasm {NativeModule} this script belongs to.
// This must only be called if the type of this script is TYPE_WASM.
DECL_ACCESSORS(wasm_managed_native_module, Object)
inline wasm::NativeModule* wasm_native_module() const;
// [wasm_weak_instance_list]: the list of all {WasmInstanceObject} being
// affected by breakpoints that are managed via this script.
// This must only be called if the type of this script is TYPE_WASM.
DECL_ACCESSORS(wasm_weak_instance_list, WeakArrayList)
// [break_on_entry] (wasm only): whether an instrumentation breakpoint is set
// for this script; this information will be transferred to existing and
// future instances to make sure that we stop before executing any code in
// this wasm module.
inline bool break_on_entry() const;
inline void set_break_on_entry(bool value);
// Check if the script contains any Asm modules.
bool ContainsAsmModule();
#endif // V8_ENABLE_WEBASSEMBLY
// [compilation_type]: how the the script was compiled. Encoded in the
// 'flags' field.
inline CompilationType compilation_type();
inline void set_compilation_type(CompilationType type);
// [compilation_state]: determines whether the script has already been
// compiled. Encoded in the 'flags' field.
inline CompilationState compilation_state();
inline void set_compilation_state(CompilationState state);
// [is_repl_mode]: whether this script originated from a REPL via debug
// evaluate and therefore has different semantics, e.g. re-declaring let.
inline bool is_repl_mode() const;
inline void set_is_repl_mode(bool value);
// [origin_options]: optional attributes set by the embedder via ScriptOrigin,
// and used by the embedder to make decisions about the script. V8 just passes
// this through. Encoded in the 'flags' field.
inline v8::ScriptOriginOptions origin_options();
inline void set_origin_options(ScriptOriginOptions origin_options);
// If script source is an external string, check that the underlying
// resource is accessible. Otherwise, always return true.
inline bool HasValidSource();
// If the script has a non-empty sourceURL comment.
inline bool HasSourceURLComment() const;
// Streaming compilation only attaches the source to the Script upon
// finalization. This predicate returns true, if this script may still be
// unfinalized.
inline bool IsMaybeUnfinalized(Isolate* isolate) const;
Object GetNameOrSourceURL();
// Retrieve source position from where eval was called.
static int GetEvalPosition(Isolate* isolate, Handle<Script> script);
// Init line_ends array with source code positions of line ends.
template <typename IsolateT>
EXPORT_TEMPLATE_DECLARE(V8_EXPORT_PRIVATE)
static void InitLineEnds(IsolateT* isolate, Handle<Script> script);
// Carries information about a source position.
struct PositionInfo {
PositionInfo() : line(-1), column(-1), line_start(-1), line_end(-1) {}
int line; // Zero-based line number.
int column; // Zero-based column number.
int line_start; // Position of first character in line.
int line_end; // Position of final linebreak character in line.
};
// Specifies whether to add offsets to position infos.
enum OffsetFlag { NO_OFFSET = 0, WITH_OFFSET = 1 };
// Retrieves information about the given position, optionally with an offset.
// Returns false on failure, and otherwise writes into the given info object
// on success.
// The static method should is preferable for handlified callsites because it
// initializes the line ends array, avoiding expensive recomputations.
// The non-static version is not allocating and safe for unhandlified
// callsites.
static bool GetPositionInfo(Handle<Script> script, int position,
PositionInfo* info, OffsetFlag offset_flag);
V8_EXPORT_PRIVATE bool GetPositionInfo(int position, PositionInfo* info,
OffsetFlag offset_flag) const;
bool IsUserJavaScript() const;
// Wrappers for GetPositionInfo
static int GetColumnNumber(Handle<Script> script, int code_offset);
int GetColumnNumber(int code_pos) const;
V8_EXPORT_PRIVATE static int GetLineNumber(Handle<Script> script,
int code_offset);
int GetLineNumber(int code_pos) const;
// Look through the list of existing shared function infos to find one
// that matches the function literal. Return empty handle if not found.
template <typename IsolateT>
static MaybeHandle<SharedFunctionInfo> FindSharedFunctionInfo(
Handle<Script> script, IsolateT* isolate,
FunctionLiteral* function_literal);
static MaybeHandle<SharedFunctionInfo> FindWebSnapshotSharedFunctionInfo(
Handle<Script> script, Isolate* isolate,
FunctionLiteral* function_literal);
static MaybeHandle<SharedFunctionInfo> FindWebSnapshotSharedFunctionInfo(
Handle<Script> script, LocalIsolate* isolate,
FunctionLiteral* function_literal);
// Iterate over all script objects on the heap.
class V8_EXPORT_PRIVATE Iterator {
public:
explicit Iterator(Isolate* isolate);
Iterator(const Iterator&) = delete;
Iterator& operator=(const Iterator&) = delete;
Script Next();
private:
WeakArrayList::Iterator iterator_;
};
// Dispatched behavior.
DECL_PRINTER(Script)
DECL_VERIFIER(Script)
private:
// Bit positions in the flags field.
DEFINE_TORQUE_GENERATED_SCRIPT_FLAGS()
TQ_OBJECT_CONSTRUCTORS(Script)
};
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_SCRIPT_H_
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