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// Copyright 2014 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_STRING_STREAM_H_
#define V8_STRING_STREAM_H_
#include "src/handles.h"
namespace v8 {
namespace internal {
class StringAllocator {
public:
virtual ~StringAllocator() { }
// Allocate a number of bytes.
virtual char* allocate(unsigned bytes) = 0;
// Allocate a larger number of bytes and copy the old buffer to the new one.
// bytes is an input and output parameter passing the old size of the buffer
// and returning the new size. If allocation fails then we return the old
// buffer and do not increase the size.
virtual char* grow(unsigned* bytes) = 0;
};
// Normal allocator uses new[] and delete[].
class HeapStringAllocator final : public StringAllocator {
public:
~HeapStringAllocator() { DeleteArray(space_); }
char* allocate(unsigned bytes) override;
char* grow(unsigned* bytes) override;
private:
char* space_;
};
class FixedStringAllocator final : public StringAllocator {
public:
FixedStringAllocator(char* buffer, unsigned length)
: buffer_(buffer), length_(length) {}
~FixedStringAllocator() override{};
char* allocate(unsigned bytes) override;
char* grow(unsigned* bytes) override;
private:
char* buffer_;
unsigned length_;
DISALLOW_COPY_AND_ASSIGN(FixedStringAllocator);
};
class FmtElm final {
public:
FmtElm(int value) : type_(INT) { // NOLINT
data_.u_int_ = value;
}
explicit FmtElm(double value) : type_(DOUBLE) {
data_.u_double_ = value;
}
FmtElm(const char* value) : type_(C_STR) { // NOLINT
data_.u_c_str_ = value;
}
FmtElm(const Vector<const uc16>& value) : type_(LC_STR) { // NOLINT
data_.u_lc_str_ = &value;
}
FmtElm(Object* value) : type_(OBJ) { // NOLINT
data_.u_obj_ = value;
}
FmtElm(Handle<Object> value) : type_(HANDLE) { // NOLINT
data_.u_handle_ = value.location();
}
FmtElm(void* value) : type_(POINTER) { // NOLINT
data_.u_pointer_ = value;
}
private:
friend class StringStream;
enum Type { INT, DOUBLE, C_STR, LC_STR, OBJ, HANDLE, POINTER };
Type type_;
union {
int u_int_;
double u_double_;
const char* u_c_str_;
const Vector<const uc16>* u_lc_str_;
Object* u_obj_;
Object** u_handle_;
void* u_pointer_;
} data_;
};
class StringStream final {
public:
enum ObjectPrintMode { kPrintObjectConcise, kPrintObjectVerbose };
StringStream(StringAllocator* allocator,
ObjectPrintMode object_print_mode = kPrintObjectConcise)
: allocator_(allocator),
object_print_mode_(object_print_mode),
capacity_(kInitialCapacity),
length_(0),
buffer_(allocator_->allocate(kInitialCapacity)) {
buffer_[0] = 0;
}
bool Put(char c);
bool Put(String* str);
bool Put(String* str, int start, int end);
void Add(Vector<const char> format, Vector<FmtElm> elms);
void Add(const char* format);
void Add(Vector<const char> format);
void Add(const char* format, FmtElm arg0);
void Add(const char* format, FmtElm arg0, FmtElm arg1);
void Add(const char* format, FmtElm arg0, FmtElm arg1, FmtElm arg2);
void Add(const char* format,
FmtElm arg0,
FmtElm arg1,
FmtElm arg2,
FmtElm arg3);
void Add(const char* format,
FmtElm arg0,
FmtElm arg1,
FmtElm arg2,
FmtElm arg3,
FmtElm arg4);
// Getting the message out.
void OutputToFile(FILE* out);
void OutputToStdOut() { OutputToFile(stdout); }
void Log(Isolate* isolate);
Handle<String> ToString(Isolate* isolate);
SmartArrayPointer<const char> ToCString() const;
int length() const { return length_; }
// Object printing support.
void PrintName(Object* o);
void PrintFixedArray(FixedArray* array, unsigned int limit);
void PrintByteArray(ByteArray* ba);
void PrintUsingMap(JSObject* js_object);
void PrintPrototype(JSFunction* fun, Object* receiver);
void PrintSecurityTokenIfChanged(Object* function);
// NOTE: Returns the code in the output parameter.
void PrintFunction(Object* function, Object* receiver, Code** code);
// Reset the stream.
void Reset() {
length_ = 0;
buffer_[0] = 0;
}
// Mentioned object cache support.
void PrintMentionedObjectCache(Isolate* isolate);
static void ClearMentionedObjectCache(Isolate* isolate);
#ifdef DEBUG
bool IsMentionedObjectCacheClear(Isolate* isolate);
#endif
static const int kInitialCapacity = 16;
private:
void PrintObject(Object* obj);
StringAllocator* allocator_;
ObjectPrintMode object_print_mode_;
unsigned capacity_;
unsigned length_; // does not include terminating 0-character
char* buffer_;
bool full() const { return (capacity_ - length_) == 1; }
int space() const { return capacity_ - length_; }
DISALLOW_IMPLICIT_CONSTRUCTORS(StringStream);
};
} } // namespace v8::internal
#endif // V8_STRING_STREAM_H_
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