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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#include "CPU.h"
#include <wtf/PrintStream.h>
#include <wtf/StringPrintStream.h>
#include <wtf/Vector.h>
namespace JSC {
namespace Probe {
class Context;
} // namespace Probe
namespace Printer {
struct Context;
union Data {
Data()
{
const intptr_t uninitialized = 0xdeadb0d0;
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
memcpy(&buffer, &uninitialized, sizeof(uninitialized));
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
}
Data(uintptr_t value)
: Data(&value, sizeof(value))
{ }
Data(const void* pointer)
: Data(&pointer, sizeof(pointer))
{ }
Data(void* src, size_t size)
{
RELEASE_ASSERT(size <= sizeof(buffer));
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
memcpy(&buffer, src, size);
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
}
template<typename T, typename = typename std::enable_if<std::is_integral<T>::value>::type>
T as() const
{
return static_cast<T>(value);
}
template<typename T, typename = typename std::enable_if<std::is_pointer<T>::value>::type>
const T as(int = 0) const
{
return reinterpret_cast<const T>(pointer);
}
template<typename T, typename = typename std::enable_if<!std::is_integral<T>::value && !std::is_pointer<T>::value>::type>
const T& as() const
{
static_assert(sizeof(T) <= sizeof(buffer), "size is not sane");
return *reinterpret_cast<const T*>(&buffer);
}
uintptr_t value;
const void* pointer;
#if USE(JSVALUE64)
UCPURegister buffer[4];
#elif USE(JSVALUE32_64)
UCPURegister buffer[6];
#endif
};
struct Context {
Context(Probe::Context& probeContext, Data& data)
: probeContext(probeContext)
, data(data)
{ }
Probe::Context& probeContext;
Data& data;
};
typedef void (*Callback)(PrintStream&, Context&);
struct PrintRecord {
PrintRecord(Data data, Callback printer)
: data(data)
, printer(printer)
{ }
PrintRecord(Callback printer)
: printer(printer)
{ }
template<template<class> class Printer, typename T>
PrintRecord(const Printer<T>& other)
{
static_assert(std::is_base_of<PrintRecord, Printer<T>>::value, "Printer should extend PrintRecord");
static_assert(sizeof(PrintRecord) == sizeof(Printer<T>), "Printer should be the same size as PrintRecord");
data = other.data;
printer = other.printer;
}
Data data;
Callback printer;
protected:
PrintRecord() { }
};
template<typename T> struct Printer;
typedef Vector<PrintRecord> PrintRecordList;
inline void appendPrinter(PrintRecordList&) { }
template<typename First, typename... Arguments>
inline void appendPrinter(PrintRecordList& printRecordList, First first, Arguments&&... others)
{
printRecordList.append(Printer<First>(first));
appendPrinter(printRecordList, std::forward<Arguments>(others)...);
}
template<typename... Arguments>
inline PrintRecordList* makePrintRecordList(Arguments&&... arguments)
{
// FIXME: the current implementation intentionally leaks the PrintRecordList.
// We may want to fix this in the future if we want to use the print mechanism
// in tests that may compile a lot of prints.
// https://bugs.webkit.org/show_bug.cgi?id=171123
auto printRecordList = new PrintRecordList();
appendPrinter(*printRecordList, std::forward<Arguments>(arguments)...);
return printRecordList;
}
// Some utility functions for specializing printers.
void printConstCharString(PrintStream&, Context&);
void printIntptr(PrintStream&, Context&);
void printUintptr(PrintStream&, Context&);
void printPointer(PrintStream&, Context&);
void setPrinter(PrintRecord&, CString&&);
// Specialized printers.
template<>
struct Printer<const char*> : public PrintRecord {
Printer(const char* str)
: PrintRecord(str, printConstCharString)
{ }
};
template<>
struct Printer<char*> : public Printer<const char*> {
Printer(char* str)
: Printer<const char*>(str)
{ }
};
template<>
struct Printer<RawPointer> : public PrintRecord {
Printer(RawPointer rawPointer)
: PrintRecord(rawPointer.value(), printPointer)
{ }
};
template<typename T>
std::enable_if_t<std::is_integral_v<T>>
setPrinter(PrintRecord& record, T value, intptr_t = 0)
{
record.data.value = static_cast<uintptr_t>(value);
if constexpr (std::numeric_limits<T>::is_signed)
record.printer = printIntptr;
else
record.printer = printUintptr;
}
template<typename T>
struct Printer : public PrintRecord {
Printer(T value)
{
setPrinter(*this, value);
}
};
} // namespace Printer
} // namespace JSC
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