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// Copyright 2014 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_AST_AST_VALUE_FACTORY_H_
#define V8_AST_AST_VALUE_FACTORY_H_
#include <forward_list>
#include "src/base/hashmap.h"
#include "src/conversions.h"
#include "src/globals.h"
#include "src/heap/factory.h"
#include "src/isolate.h"
#include "src/utils.h"
// Ast(Raw|Cons)String and AstValueFactory are for storing strings and
// values independent of the V8 heap and internalizing them later. During
// parsing, they are created and stored outside the heap, in AstValueFactory.
// After parsing, the strings and values are internalized (moved into the V8
// heap).
namespace v8 {
namespace internal {
class AstRawString final : public ZoneObject {
public:
bool IsEmpty() const { return literal_bytes_.length() == 0; }
int length() const {
return is_one_byte() ? literal_bytes_.length()
: literal_bytes_.length() / 2;
}
bool AsArrayIndex(uint32_t* index) const;
bool IsOneByteEqualTo(const char* data) const;
uint16_t FirstCharacter() const;
void Internalize(Isolate* isolate);
// Access the physical representation:
bool is_one_byte() const { return is_one_byte_; }
int byte_length() const { return literal_bytes_.length(); }
const unsigned char* raw_data() const {
return literal_bytes_.start();
}
// For storing AstRawStrings in a hash map.
uint32_t hash_field() const { return hash_field_; }
uint32_t Hash() const { return hash_field_ >> Name::kHashShift; }
// This function can be called after internalizing.
V8_INLINE Handle<String> string() const {
DCHECK_NOT_NULL(string_);
DCHECK(has_string_);
return Handle<String>(string_);
}
private:
friend class AstRawStringInternalizationKey;
friend class AstStringConstants;
friend class AstValueFactory;
// Members accessed only by the AstValueFactory & related classes:
static bool Compare(void* a, void* b);
AstRawString(bool is_one_byte, const Vector<const byte>& literal_bytes,
uint32_t hash_field)
: next_(nullptr),
literal_bytes_(literal_bytes),
hash_field_(hash_field),
is_one_byte_(is_one_byte) {}
AstRawString* next() {
DCHECK(!has_string_);
return next_;
}
AstRawString** next_location() {
DCHECK(!has_string_);
return &next_;
}
void set_string(Handle<String> string) {
DCHECK(!string.is_null());
DCHECK(!has_string_);
string_ = string.location();
#ifdef DEBUG
has_string_ = true;
#endif
}
// {string_} is stored as String** instead of a Handle<String> so it can be
// stored in a union with {next_}.
union {
AstRawString* next_;
String** string_;
};
Vector<const byte> literal_bytes_; // Memory owned by Zone.
uint32_t hash_field_;
bool is_one_byte_;
#ifdef DEBUG
// (Debug-only:) Verify the object life-cylce: Some functions may only be
// called after internalization (that is, after a v8::internal::String has
// been set); some only before.
bool has_string_ = false;
#endif
};
class AstConsString final : public ZoneObject {
public:
AstConsString* AddString(Zone* zone, const AstRawString* s) {
if (s->IsEmpty()) return this;
if (!IsEmpty()) {
// We're putting the new string to the head of the list, meaning
// the string segments will be in reverse order.
Segment* tmp = new (zone->New(sizeof(Segment))) Segment;
*tmp = segment_;
segment_.next = tmp;
}
segment_.string = s;
return this;
}
bool IsEmpty() const {
DCHECK_IMPLIES(segment_.string == nullptr, segment_.next == nullptr);
DCHECK_IMPLIES(segment_.string != nullptr, !segment_.string->IsEmpty());
return segment_.string == nullptr;
}
void Internalize(Isolate* isolate);
V8_INLINE Handle<String> string() const {
DCHECK_NOT_NULL(string_);
return Handle<String>(string_);
}
std::forward_list<const AstRawString*> ToRawStrings() const;
private:
friend class AstValueFactory;
AstConsString() : next_(nullptr), segment_({nullptr, nullptr}) {}
AstConsString* next() const { return next_; }
AstConsString** next_location() { return &next_; }
// {string_} is stored as String** instead of a Handle<String> so it can be
// stored in a union with {next_}.
void set_string(Handle<String> string) { string_ = string.location(); }
union {
AstConsString* next_;
String** string_;
};
struct Segment {
const AstRawString* string;
AstConsString::Segment* next;
};
Segment segment_;
};
enum class AstSymbol : uint8_t { kHomeObjectSymbol };
class AstBigInt {
public:
// |bigint| must be a NUL-terminated string of ASCII characters
// representing a BigInt (suitable for passing to BigIntLiteral()
// from conversions.h).
explicit AstBigInt(const char* bigint) : bigint_(bigint) {}
const char* c_str() const { return bigint_; }
private:
const char* bigint_;
};
// For generating constants.
#define AST_STRING_CONSTANTS(F) \
F(anonymous_function, "(anonymous function)") \
F(arguments, "arguments") \
F(async, "async") \
F(await, "await") \
F(bigint, "bigint") \
F(boolean, "boolean") \
F(constructor, "constructor") \
F(default, "default") \
F(done, "done") \
F(dot, ".") \
F(dot_for, ".for") \
F(dot_generator_object, ".generator_object") \
F(dot_iterator, ".iterator") \
F(dot_result, ".result") \
F(dot_switch_tag, ".switch_tag") \
F(dot_catch, ".catch") \
F(empty, "") \
F(eval, "eval") \
F(function, "function") \
F(get_space, "get ") \
F(length, "length") \
F(let, "let") \
F(name, "name") \
F(native, "native") \
F(new_target, ".new.target") \
F(next, "next") \
F(number, "number") \
F(object, "object") \
F(proto, "__proto__") \
F(prototype, "prototype") \
F(return, "return") \
F(set_space, "set ") \
F(star_default_star, "*default*") \
F(string, "string") \
F(symbol, "symbol") \
F(this, "this") \
F(this_function, ".this_function") \
F(throw, "throw") \
F(undefined, "undefined") \
F(use_asm, "use asm") \
F(use_strict, "use strict") \
F(value, "value")
class AstStringConstants final {
public:
AstStringConstants(Isolate* isolate, uint64_t hash_seed);
#define F(name, str) \
const AstRawString* name##_string() const { return name##_string_; }
AST_STRING_CONSTANTS(F)
#undef F
uint64_t hash_seed() const { return hash_seed_; }
const base::CustomMatcherHashMap* string_table() const {
return &string_table_;
}
private:
Zone zone_;
base::CustomMatcherHashMap string_table_;
uint64_t hash_seed_;
#define F(name, str) AstRawString* name##_string_;
AST_STRING_CONSTANTS(F)
#undef F
DISALLOW_COPY_AND_ASSIGN(AstStringConstants);
};
class AstValueFactory {
public:
AstValueFactory(Zone* zone, const AstStringConstants* string_constants,
uint64_t hash_seed)
: string_table_(string_constants->string_table()),
strings_(nullptr),
strings_end_(&strings_),
cons_strings_(nullptr),
cons_strings_end_(&cons_strings_),
string_constants_(string_constants),
empty_cons_string_(nullptr),
zone_(zone),
hash_seed_(hash_seed) {
DCHECK_EQ(hash_seed, string_constants->hash_seed());
std::fill(one_character_strings_,
one_character_strings_ + arraysize(one_character_strings_),
nullptr);
empty_cons_string_ = NewConsString();
}
Zone* zone() const { return zone_; }
const AstRawString* GetOneByteString(Vector<const uint8_t> literal) {
return GetOneByteStringInternal(literal);
}
const AstRawString* GetOneByteString(const char* string) {
return GetOneByteString(Vector<const uint8_t>(
reinterpret_cast<const uint8_t*>(string), StrLength(string)));
}
const AstRawString* GetTwoByteString(Vector<const uint16_t> literal) {
return GetTwoByteStringInternal(literal);
}
const AstRawString* GetString(Handle<String> literal);
V8_EXPORT_PRIVATE AstConsString* NewConsString();
AstConsString* NewConsString(const AstRawString* str);
AstConsString* NewConsString(const AstRawString* str1,
const AstRawString* str2);
V8_EXPORT_PRIVATE void Internalize(Isolate* isolate);
#define F(name, str) \
const AstRawString* name##_string() const { \
return string_constants_->name##_string(); \
}
AST_STRING_CONSTANTS(F)
#undef F
const AstConsString* empty_cons_string() const { return empty_cons_string_; }
private:
AstRawString* AddString(AstRawString* string) {
*strings_end_ = string;
strings_end_ = string->next_location();
return string;
}
AstConsString* AddConsString(AstConsString* string) {
*cons_strings_end_ = string;
cons_strings_end_ = string->next_location();
return string;
}
void ResetStrings() {
strings_ = nullptr;
strings_end_ = &strings_;
cons_strings_ = nullptr;
cons_strings_end_ = &cons_strings_;
}
V8_EXPORT_PRIVATE AstRawString* GetOneByteStringInternal(
Vector<const uint8_t> literal);
AstRawString* GetTwoByteStringInternal(Vector<const uint16_t> literal);
AstRawString* GetString(uint32_t hash, bool is_one_byte,
Vector<const byte> literal_bytes);
// All strings are copied here, one after another (no zeroes inbetween).
base::CustomMatcherHashMap string_table_;
// We need to keep track of strings_ in order since cons strings require their
// members to be internalized first.
AstRawString* strings_;
AstRawString** strings_end_;
AstConsString* cons_strings_;
AstConsString** cons_strings_end_;
// Holds constant string values which are shared across the isolate.
const AstStringConstants* string_constants_;
const AstConsString* empty_cons_string_;
// Caches one character lowercase strings (for minified code).
AstRawString* one_character_strings_[26];
Zone* zone_;
uint64_t hash_seed_;
};
} // namespace internal
} // namespace v8
#endif // V8_AST_AST_VALUE_FACTORY_H_