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// Copyright 2012 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_BASE_LOGGING_H_
#define V8_BASE_LOGGING_H_
#include <cstring>
#include <sstream>
#include <string>
#include "src/base/base-export.h"
#include "src/base/build_config.h"
#include "src/base/compiler-specific.h"
extern "C" PRINTF_FORMAT(3, 4) V8_NORETURN V8_BASE_EXPORT
void V8_Fatal(const char* file, int line, const char* format, ...);
// The FATAL, UNREACHABLE and UNIMPLEMENTED macros are useful during
// development, but they should not be relied on in the final product.
#ifdef DEBUG
#define FATAL(msg) \
V8_Fatal(__FILE__, __LINE__, "%s", (msg))
#define UNIMPLEMENTED() \
V8_Fatal(__FILE__, __LINE__, "unimplemented code")
#define UNREACHABLE() \
V8_Fatal(__FILE__, __LINE__, "unreachable code")
#else
#define FATAL(msg) \
V8_Fatal("", 0, "%s", (msg))
#define UNIMPLEMENTED() \
V8_Fatal("", 0, "unimplemented code")
#define UNREACHABLE() V8_Fatal("", 0, "unreachable code")
#endif
namespace v8 {
namespace base {
// CHECK dies with a fatal error if condition is not true. It is *not*
// controlled by DEBUG, so the check will be executed regardless of
// compilation mode.
//
// We make sure CHECK et al. always evaluates their arguments, as
// doing CHECK(FunctionWithSideEffect()) is a common idiom.
#define CHECK(condition) \
do { \
if (V8_UNLIKELY(!(condition))) { \
V8_Fatal(__FILE__, __LINE__, "Check failed: %s.", #condition); \
} \
} while (0)
#ifdef DEBUG
// Helper macro for binary operators.
// Don't use this macro directly in your code, use CHECK_EQ et al below.
#define CHECK_OP(name, op, lhs, rhs) \
do { \
if (std::string* _msg = \
::v8::base::Check##name##Impl<decltype(lhs), decltype(rhs)>( \
(lhs), (rhs), #lhs " " #op " " #rhs)) { \
V8_Fatal(__FILE__, __LINE__, "Check failed: %s.", _msg->c_str()); \
delete _msg; \
} \
} while (0)
#else
// Make all CHECK functions discard their log strings to reduce code
// bloat for official release builds.
#define CHECK_OP(name, op, lhs, rhs) CHECK((lhs)op(rhs))
#endif
// Helper to determine how to pass values: Pass scalars and arrays by value,
// others by const reference. std::decay<T> provides the type which should be
// used to pass T by value, e.g. converts array to pointer and removes const,
// volatile and reference.
template <typename T>
struct PassType : public std::conditional<
std::is_scalar<typename std::decay<T>::type>::value,
typename std::decay<T>::type, T const&> {};
// Build the error message string. This is separate from the "Impl"
// function template because it is not performance critical and so can
// be out of line, while the "Impl" code should be inline. Caller
// takes ownership of the returned string.
template <typename Lhs, typename Rhs>
std::string* MakeCheckOpString(typename PassType<Lhs>::type lhs,
typename PassType<Rhs>::type rhs,
char const* msg) {
std::ostringstream ss;
ss << msg << " (" << lhs << " vs. " << rhs << ")";
return new std::string(ss.str());
}
// Commonly used instantiations of MakeCheckOpString<>. Explicitly instantiated
// in logging.cc.
#define DEFINE_MAKE_CHECK_OP_STRING(type) \
extern template V8_BASE_EXPORT std::string* MakeCheckOpString<type, type>( \
type, type, char const*);
DEFINE_MAKE_CHECK_OP_STRING(int)
DEFINE_MAKE_CHECK_OP_STRING(long) // NOLINT(runtime/int)
DEFINE_MAKE_CHECK_OP_STRING(long long) // NOLINT(runtime/int)
DEFINE_MAKE_CHECK_OP_STRING(unsigned int)
DEFINE_MAKE_CHECK_OP_STRING(unsigned long) // NOLINT(runtime/int)
DEFINE_MAKE_CHECK_OP_STRING(unsigned long long) // NOLINT(runtime/int)
DEFINE_MAKE_CHECK_OP_STRING(char const*)
DEFINE_MAKE_CHECK_OP_STRING(void const*)
#undef DEFINE_MAKE_CHECK_OP_STRING
// is_signed_vs_unsigned::value is true if both types are integral, Lhs is
// signed, and Rhs is unsigned. False in all other cases.
template <typename Lhs, typename Rhs>
struct is_signed_vs_unsigned {
enum : bool {
value = std::is_integral<Lhs>::value && std::is_integral<Rhs>::value &&
std::is_signed<Lhs>::value && std::is_unsigned<Rhs>::value
};
};
// Same thing, other way around: Lhs is unsigned, Rhs signed.
template <typename Lhs, typename Rhs>
struct is_unsigned_vs_signed : public is_signed_vs_unsigned<Rhs, Lhs> {};
// Specialize the compare functions for signed vs. unsigned comparisons.
// std::enable_if ensures that this template is only instantiable if both Lhs
// and Rhs are integral types, and their signedness does not match.
#define MAKE_UNSIGNED(Type, value) \
static_cast<typename std::make_unsigned<Type>::type>(value)
#define DEFINE_SIGNED_MISMATCH_COMP(CHECK, NAME, IMPL) \
template <typename Lhs, typename Rhs> \
V8_INLINE typename std::enable_if<CHECK<Lhs, Rhs>::value, bool>::type \
Cmp##NAME##Impl(Lhs const& lhs, Rhs const& rhs) { \
return IMPL; \
}
DEFINE_SIGNED_MISMATCH_COMP(is_signed_vs_unsigned, EQ,
lhs >= 0 && MAKE_UNSIGNED(Lhs, lhs) == rhs)
DEFINE_SIGNED_MISMATCH_COMP(is_signed_vs_unsigned, LT,
lhs < 0 || MAKE_UNSIGNED(Lhs, lhs) < rhs)
DEFINE_SIGNED_MISMATCH_COMP(is_signed_vs_unsigned, LE,
lhs <= 0 || MAKE_UNSIGNED(Lhs, lhs) <= rhs)
DEFINE_SIGNED_MISMATCH_COMP(is_signed_vs_unsigned, NE, !CmpEQImpl(lhs, rhs))
DEFINE_SIGNED_MISMATCH_COMP(is_signed_vs_unsigned, GT, !CmpLEImpl(lhs, rhs))
DEFINE_SIGNED_MISMATCH_COMP(is_signed_vs_unsigned, GE, !CmpLTImpl(lhs, rhs))
DEFINE_SIGNED_MISMATCH_COMP(is_unsigned_vs_signed, EQ, CmpEQImpl(rhs, lhs))
DEFINE_SIGNED_MISMATCH_COMP(is_unsigned_vs_signed, NE, CmpNEImpl(rhs, lhs))
DEFINE_SIGNED_MISMATCH_COMP(is_unsigned_vs_signed, LT, CmpGTImpl(rhs, lhs))
DEFINE_SIGNED_MISMATCH_COMP(is_unsigned_vs_signed, LE, CmpGEImpl(rhs, lhs))
DEFINE_SIGNED_MISMATCH_COMP(is_unsigned_vs_signed, GT, CmpLTImpl(rhs, lhs))
DEFINE_SIGNED_MISMATCH_COMP(is_unsigned_vs_signed, GE, CmpLEImpl(rhs, lhs))
#undef MAKE_UNSIGNED
#undef DEFINE_SIGNED_MISMATCH_COMP
// Helper functions for CHECK_OP macro.
// The (float, float) and (double, double) instantiations are explicitly
// externalized to ensure proper 32/64-bit comparisons on x86.
// The Cmp##NAME##Impl function is only instantiable if one of the two types is
// not integral or their signedness matches (i.e. whenever no specialization is
// required, see above). Otherwise it is disabled by the enable_if construct,
// and the compiler will pick a specialization from above.
#define DEFINE_CHECK_OP_IMPL(NAME, op) \
template <typename Lhs, typename Rhs> \
V8_INLINE \
typename std::enable_if<!is_signed_vs_unsigned<Lhs, Rhs>::value && \
!is_unsigned_vs_signed<Lhs, Rhs>::value, \
bool>::type \
Cmp##NAME##Impl(typename PassType<Lhs>::type lhs, \
typename PassType<Rhs>::type rhs) { \
return lhs op rhs; \
} \
template <typename Lhs, typename Rhs> \
V8_INLINE std::string* Check##NAME##Impl(typename PassType<Lhs>::type lhs, \
typename PassType<Rhs>::type rhs, \
char const* msg) { \
bool cmp = Cmp##NAME##Impl<Lhs, Rhs>(lhs, rhs); \
return V8_LIKELY(cmp) ? nullptr \
: MakeCheckOpString<Lhs, Rhs>(lhs, rhs, msg); \
} \
extern template V8_BASE_EXPORT std::string* Check##NAME##Impl<float, float>( \
float lhs, float rhs, char const* msg); \
extern template V8_BASE_EXPORT std::string* \
Check##NAME##Impl<double, double>(double lhs, double rhs, \
char const* msg);
DEFINE_CHECK_OP_IMPL(EQ, ==)
DEFINE_CHECK_OP_IMPL(NE, !=)
DEFINE_CHECK_OP_IMPL(LE, <=)
DEFINE_CHECK_OP_IMPL(LT, < )
DEFINE_CHECK_OP_IMPL(GE, >=)
DEFINE_CHECK_OP_IMPL(GT, > )
#undef DEFINE_CHECK_OP_IMPL
#define CHECK_EQ(lhs, rhs) CHECK_OP(EQ, ==, lhs, rhs)
#define CHECK_NE(lhs, rhs) CHECK_OP(NE, !=, lhs, rhs)
#define CHECK_LE(lhs, rhs) CHECK_OP(LE, <=, lhs, rhs)
#define CHECK_LT(lhs, rhs) CHECK_OP(LT, <, lhs, rhs)
#define CHECK_GE(lhs, rhs) CHECK_OP(GE, >=, lhs, rhs)
#define CHECK_GT(lhs, rhs) CHECK_OP(GT, >, lhs, rhs)
#define CHECK_NULL(val) CHECK((val) == nullptr)
#define CHECK_NOT_NULL(val) CHECK((val) != nullptr)
#define CHECK_IMPLIES(lhs, rhs) CHECK(!(lhs) || (rhs))
} // namespace base
} // namespace v8
// The DCHECK macro is equivalent to CHECK except that it only
// generates code in debug builds.
#ifdef DEBUG
#define DCHECK(condition) CHECK(condition)
#define DCHECK_EQ(v1, v2) CHECK_EQ(v1, v2)
#define DCHECK_NE(v1, v2) CHECK_NE(v1, v2)
#define DCHECK_GT(v1, v2) CHECK_GT(v1, v2)
#define DCHECK_GE(v1, v2) CHECK_GE(v1, v2)
#define DCHECK_LT(v1, v2) CHECK_LT(v1, v2)
#define DCHECK_LE(v1, v2) CHECK_LE(v1, v2)
#define DCHECK_NULL(val) CHECK_NULL(val)
#define DCHECK_NOT_NULL(val) CHECK_NOT_NULL(val)
#define DCHECK_IMPLIES(v1, v2) CHECK_IMPLIES(v1, v2)
#else
#define DCHECK(condition) ((void) 0)
#define DCHECK_EQ(v1, v2) ((void) 0)
#define DCHECK_NE(v1, v2) ((void) 0)
#define DCHECK_GT(v1, v2) ((void) 0)
#define DCHECK_GE(v1, v2) ((void) 0)
#define DCHECK_LT(v1, v2) ((void) 0)
#define DCHECK_LE(v1, v2) ((void) 0)
#define DCHECK_NULL(val) ((void) 0)
#define DCHECK_NOT_NULL(val) ((void) 0)
#define DCHECK_IMPLIES(v1, v2) ((void) 0)
#endif
#endif // V8_BASE_LOGGING_H_
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