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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.
//
//===----------------------------------------------------------------------===//
#pragma once
#include <iosfwd>
#include <iostream>
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(nullptr) {}
explicit Stream(std::ostream *S) : OS(S) {}
explicit 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(...);
};
extern bool _Logger_enabled;
namespace Logger {
void indent();
void undent();
Stream cout();
void printIndentation();
void println(const char *fmt, ...) IS_PRINTF(1);
void print(const char *fmt, ...) IS_PRINTF(1);
inline void enable() { _Logger_enabled = true; }
inline void disable() { _Logger_enabled = false; }
inline bool enabled() { return _Logger_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())
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