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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/build_config.h"
extern "C" V8_NORETURN void V8_Fatal(const char* file, int line,
const char* format, ...);
extern "C" void V8_RuntimeError(const char* file, int line,
const char* message);
// 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( \
(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
// 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(Lhs const& lhs, Rhs const& 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 std::string* MakeCheckOpString<type, type>( \
type const&, type const&, 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
// Helper functions for CHECK_OP macro.
// The (int, int) specialization works around the issue that the compiler
// will not instantiate the template version of the function on values of
// unnamed enum type - see comment below.
// The (float, float) and (double, double) instantiations are explicitly
// externialized to ensure proper 32/64-bit comparisons on x86.
#define DEFINE_CHECK_OP_IMPL(NAME, op) \
template <typename Lhs, typename Rhs> \
V8_INLINE std::string* Check##NAME##Impl(Lhs const& lhs, Rhs const& rhs, \
char const* msg) { \
return V8_LIKELY(lhs op rhs) ? nullptr : MakeCheckOpString(lhs, rhs, msg); \
} \
V8_INLINE std::string* Check##NAME##Impl(int lhs, int rhs, \
char const* msg) { \
return V8_LIKELY(lhs op rhs) ? nullptr : MakeCheckOpString(lhs, rhs, msg); \
} \
extern template std::string* Check##NAME##Impl<float, float>( \
float const& lhs, float const& rhs, char const* msg); \
extern template std::string* Check##NAME##Impl<double, double>( \
double const& lhs, double const& 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))
// Exposed for making debugging easier (to see where your function is being
// called, just add a call to DumpBacktrace).
void DumpBacktrace();
} // 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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