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logger.h
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logger.h
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//===-- gen/logger.h - Codegen debug logging --------------------*- C++ -*-===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
//
// Defines a common interface for logging debug information during code
// generation.
//
//===----------------------------------------------------------------------===//
#ifndef LDC_GEN_LOGGER_H
#define LDC_GEN_LOGGER_H
#include <iosfwd>
namespace llvm {
class Type;
class Value;
}
#ifndef IS_PRINTF
# ifdef __GNUC__
# define IS_PRINTF(FMTARG) __attribute((__format__ (__printf__, (FMTARG), (FMTARG)+1) ))
# else
# define IS_PRINTF(FMTARG)
# endif
#endif
struct Loc;
class Stream {
std::ostream* OS;
public:
Stream() : OS(0) {}
Stream(std::ostream* S) : OS(S) {}
Stream(std::ostream& S) : OS(&S) {}
/*
Stream operator << (std::ios_base &(*Func)(std::ios_base&)) {
if (OS) *OS << Func;
return *this;
}
*/
Stream operator << (std::ostream &(*Func)(std::ostream&)) {
if (OS) Func(*OS);
return *this;
}
template<typename Ty>
Stream& operator << (const Ty& Thing) {
if (OS)
Writer<Ty, sizeof(sfinae_bait(Thing))>::write(*OS, Thing);
return *this;
}
private:
// Implementation details to treat llvm::Value, llvm::Type and their
// subclasses specially (to pretty-print types).
static void writeType(std::ostream& OS, const llvm::Type& Ty);
static void writeValue(std::ostream& OS, const llvm::Value& Ty);
template<typename Ty, int N> friend struct Writer;
// error: function template partial specialization is not allowed
// So I guess type partial specialization + member function will have to do...
template<typename Ty, int N>
struct Writer {
static void write(std::ostream& OS, const Ty& Thing) {
OS << Thing;
}
};
template<typename Ty>
struct Writer<Ty, 1> {
static void write(std::ostream& OS, const llvm::Type& Thing) {
Stream::writeType(OS, Thing);
}
static void write(std::ostream& OS, const llvm::Value& Thing) {
Stream::writeValue(OS, Thing);
}
};
// NOT IMPLEMENTED
char sfinae_bait(const llvm::Type&);
char sfinae_bait(const llvm::Value&);
short sfinae_bait(...);
};
namespace Logger
{
void indent();
void undent();
Stream cout();
void println(const char* fmt, ...) IS_PRINTF(1);
void print(const char* fmt, ...) IS_PRINTF(1);
void enable();
void disable();
bool enabled();
void attention(Loc loc, const char* fmt, ...) IS_PRINTF(2);
struct LoggerScope
{
LoggerScope()
{
Logger::indent();
}
~LoggerScope()
{
Logger::undent();
}
};
}
#define LOG_SCOPE Logger::LoggerScope _logscope;
#define IF_LOG if (Logger::enabled())
#endif