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v8/src/checks.h

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// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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.
#ifndef V8_CHECKS_H_
#define V8_CHECKS_H_
#include <string.h>
#include "../include/v8stdint.h"
extern "C" 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() ((void) 0)
#endif
// The CHECK macro checks that the given condition is true; if not, it
// prints a message to stderr and aborts.
#define CHECK(condition) do { \
if (!(condition)) { \
V8_Fatal(__FILE__, __LINE__, "CHECK(%s) failed", #condition); \
} \
} while (0)
// Helper function used by the CHECK_EQ function when given int
// arguments. Should not be called directly.
inline void CheckEqualsHelper(const char* file, int line,
const char* expected_source, int expected,
const char* value_source, int value) {
if (expected != value) {
V8_Fatal(file, line,
"CHECK_EQ(%s, %s) failed\n# Expected: %i\n# Found: %i",
expected_source, value_source, expected, value);
}
}
// Helper function used by the CHECK_EQ function when given int64_t
// arguments. Should not be called directly.
inline void CheckEqualsHelper(const char* file, int line,
const char* expected_source,
int64_t expected,
const char* value_source,
int64_t value) {
if (expected != value) {
// Print int64_t values in hex, as two int32s,
// to avoid platform-dependencies.
V8_Fatal(file, line,
"CHECK_EQ(%s, %s) failed\n#"
" Expected: 0x%08x%08x\n# Found: 0x%08x%08x",
expected_source, value_source,
static_cast<uint32_t>(expected >> 32),
static_cast<uint32_t>(expected),
static_cast<uint32_t>(value >> 32),
static_cast<uint32_t>(value));
}
}
// Helper function used by the CHECK_NE function when given int
// arguments. Should not be called directly.
inline void CheckNonEqualsHelper(const char* file,
int line,
const char* unexpected_source,
int unexpected,
const char* value_source,
int value) {
if (unexpected == value) {
V8_Fatal(file, line, "CHECK_NE(%s, %s) failed\n# Value: %i",
unexpected_source, value_source, value);
}
}
// Helper function used by the CHECK function when given string
// arguments. Should not be called directly.
inline void CheckEqualsHelper(const char* file,
int line,
const char* expected_source,
const char* expected,
const char* value_source,
const char* value) {
if ((expected == NULL && value != NULL) ||
(expected != NULL && value == NULL) ||
(expected != NULL && value != NULL && strcmp(expected, value) != 0)) {
V8_Fatal(file, line,
"CHECK_EQ(%s, %s) failed\n# Expected: %s\n# Found: %s",
expected_source, value_source, expected, value);
}
}
inline void CheckNonEqualsHelper(const char* file,
int line,
const char* expected_source,
const char* expected,
const char* value_source,
const char* value) {
if (expected == value ||
(expected != NULL && value != NULL && strcmp(expected, value) == 0)) {
V8_Fatal(file, line, "CHECK_NE(%s, %s) failed\n# Value: %s",
expected_source, value_source, value);
}
}
// Helper function used by the CHECK function when given pointer
// arguments. Should not be called directly.
inline void CheckEqualsHelper(const char* file,
int line,
const char* expected_source,
const void* expected,
const char* value_source,
const void* value) {
if (expected != value) {
V8_Fatal(file, line,
"CHECK_EQ(%s, %s) failed\n# Expected: %p\n# Found: %p",
expected_source, value_source,
expected, value);
}
}
inline void CheckNonEqualsHelper(const char* file,
int line,
const char* expected_source,
const void* expected,
const char* value_source,
const void* value) {
if (expected == value) {
V8_Fatal(file, line, "CHECK_NE(%s, %s) failed\n# Value: %p",
expected_source, value_source, value);
}
}
// Helper function used by the CHECK function when given floating
// point arguments. Should not be called directly.
inline void CheckEqualsHelper(const char* file,
int line,
const char* expected_source,
double expected,
const char* value_source,
double value) {
// Force values to 64 bit memory to truncate 80 bit precision on IA32.
volatile double* exp = new double[1];
*exp = expected;
volatile double* val = new double[1];
*val = value;
if (*exp != *val) {
V8_Fatal(file, line,
"CHECK_EQ(%s, %s) failed\n# Expected: %f\n# Found: %f",
expected_source, value_source, *exp, *val);
}
delete[] exp;
delete[] val;
}
inline void CheckNonEqualsHelper(const char* file,
int line,
const char* expected_source,
double expected,
const char* value_source,
double value) {
// Force values to 64 bit memory to truncate 80 bit precision on IA32.
volatile double* exp = new double[1];
*exp = expected;
volatile double* val = new double[1];
*val = value;
if (*exp == *val) {
V8_Fatal(file, line,
"CHECK_NE(%s, %s) failed\n# Value: %f",
expected_source, value_source, *val);
}
delete[] exp;
delete[] val;
}
#define CHECK_EQ(expected, value) CheckEqualsHelper(__FILE__, __LINE__, \
#expected, expected, #value, value)
#define CHECK_NE(unexpected, value) CheckNonEqualsHelper(__FILE__, __LINE__, \
#unexpected, unexpected, #value, value)
#define CHECK_GT(a, b) CHECK((a) > (b))
#define CHECK_GE(a, b) CHECK((a) >= (b))
#define CHECK_LT(a, b) CHECK((a) < (b))
#define CHECK_LE(a, b) CHECK((a) <= (b))
// This is inspired by the static assertion facility in boost. This
// is pretty magical. If it causes you trouble on a platform you may
// find a fix in the boost code.
template <bool> class StaticAssertion;
template <> class StaticAssertion<true> { };
// This macro joins two tokens. If one of the tokens is a macro the
// helper call causes it to be resolved before joining.
#define SEMI_STATIC_JOIN(a, b) SEMI_STATIC_JOIN_HELPER(a, b)
#define SEMI_STATIC_JOIN_HELPER(a, b) a##b
// Causes an error during compilation of the condition is not
// statically known to be true. It is formulated as a typedef so that
// it can be used wherever a typedef can be used. Beware that this
// actually causes each use to introduce a new defined type with a
// name depending on the source line.
template <int> class StaticAssertionHelper { };
#define STATIC_CHECK(test) \
typedef \
StaticAssertionHelper<sizeof(StaticAssertion<static_cast<bool>((test))>)> \
SEMI_STATIC_JOIN(__StaticAssertTypedef__, __LINE__)
extern bool FLAG_enable_slow_asserts;
// The ASSERT macro is equivalent to CHECK except that it only
// generates code in debug builds.
#ifdef DEBUG
#define ASSERT_RESULT(expr) CHECK(expr)
#define ASSERT(condition) CHECK(condition)
#define ASSERT_EQ(v1, v2) CHECK_EQ(v1, v2)
#define ASSERT_NE(v1, v2) CHECK_NE(v1, v2)
#define ASSERT_GE(v1, v2) CHECK_GE(v1, v2)
#define ASSERT_LT(v1, v2) CHECK_LT(v1, v2)
#define ASSERT_LE(v1, v2) CHECK_LE(v1, v2)
#define SLOW_ASSERT(condition) CHECK(!FLAG_enable_slow_asserts || (condition))
#else
#define ASSERT_RESULT(expr) (expr)
#define ASSERT(condition) ((void) 0)
#define ASSERT_EQ(v1, v2) ((void) 0)
#define ASSERT_NE(v1, v2) ((void) 0)
#define ASSERT_GE(v1, v2) ((void) 0)
#define ASSERT_LT(v1, v2) ((void) 0)
#define ASSERT_LE(v1, v2) ((void) 0)
#define SLOW_ASSERT(condition) ((void) 0)
#endif
// Static asserts has no impact on runtime performance, so they can be
// safely enabled in release mode. Moreover, the ((void) 0) expression
// obeys different syntax rules than typedef's, e.g. it can't appear
// inside class declaration, this leads to inconsistency between debug
// and release compilation modes behavior.
#define STATIC_ASSERT(test) STATIC_CHECK(test)
#define ASSERT_NOT_NULL(p) ASSERT_NE(NULL, p)
// "Extra checks" are lightweight checks that are enabled in some release
// builds.
#ifdef ENABLE_EXTRA_CHECKS
#define EXTRA_CHECK(condition) CHECK(condition)
#else
#define EXTRA_CHECK(condition) ((void) 0)
#endif
#endif // V8_CHECKS_H_
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