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Merge pull request #584 from yuriks/outline-asserts

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Asserts: Use lambdas to keep assertion code away from the main code path
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bunnei 2015-03-08 22:25:04 -04:00
commit ba8ce6c8f5
1 changed files with 25 additions and 6 deletions
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31
src/common/assert.h
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@ -4,24 +4,43 @@
#pragma once #pragma once
#include <cstdlib>
#include "common/common_funcs.h" #include "common/common_funcs.h"
// For asserts we'd like to keep all the junk executed when an assert happens away from the
// important code in the function. One way of doing this is to put all the relevant code inside a
// lambda and force the compiler to not inline it. Unfortunately, MSVC seems to have no syntax to
// specify __declspec on lambda functions, so what we do instead is define a noinline wrapper
// template that calls the lambda. This seems to generate an extra instruction at the call-site
// compared to the ideal implementation (which wouldn't support ASSERT_MSG parameters), but is good
// enough for our purposes.
template <typename Fn>
#if defined(_MSC_VER)
__declspec(noinline, noreturn)
#elif defined(__GNUC__)
__attribute__((noinline, noreturn, cold))
#endif
static void assert_noinline_call(const Fn& fn) {
fn();
Crash();
exit(1); // Keeps GCC's mouth shut about this actually returning
}
// TODO (yuriks) allow synchronous logging so we don't need printf // TODO (yuriks) allow synchronous logging so we don't need printf
#define ASSERT(_a_) \ #define ASSERT(_a_) \
do if (!(_a_)) {\ do if (!(_a_)) { assert_noinline_call([] { \
fprintf(stderr, "Assertion Failed!\n\n Line: %d\n File: %s\n Time: %s\n", \ fprintf(stderr, "Assertion Failed!\n\n Line: %d\n File: %s\n Time: %s\n", \
__LINE__, __FILE__, __TIME__); \ __LINE__, __FILE__, __TIME__); \
Crash(); \ }); } while (0)
} while (0)
#define ASSERT_MSG(_a_, ...) \ #define ASSERT_MSG(_a_, ...) \
do if (!(_a_)) {\ do if (!(_a_)) { assert_noinline_call([&] { \
fprintf(stderr, "Assertion Failed!\n\n Line: %d\n File: %s\n Time: %s\n", \ fprintf(stderr, "Assertion Failed!\n\n Line: %d\n File: %s\n Time: %s\n", \
__LINE__, __FILE__, __TIME__); \ __LINE__, __FILE__, __TIME__); \
fprintf(stderr, __VA_ARGS__); \ fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \ fprintf(stderr, "\n"); \
Crash(); \ }); } while (0)
} while (0)
#define UNREACHABLE() ASSERT_MSG(false, "Unreachable code!") #define UNREACHABLE() ASSERT_MSG(false, "Unreachable code!")