Swift: add assertion and expectation macros

swift/extractor/infra/log/SwiftAssert.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <cstdlib>
+
+#include "swift/extractor/infra/log/SwiftLogging.h"
+
+// assert CONDITION, which is always evaluated (once) regardless of the build type. If
+// CONDITION is not satisfied, emit a critical log optionally using provided format and arguments,
+// abort the program
+#define CODEQL_ASSERT(CONDITION, ...) \
+  CODEQL_ASSERT_IMPL(CRITICAL, std::abort(), CONDITION, __VA_ARGS__)
+
+// If CONDITION is not satisfied, emit an error log optionally using provided format and arguments,
+// but continue execution
+#define CODEQL_EXPECT(CONDITION, ...) CODEQL_EXPECT_OR(void(), CONDITION, __VA_ARGS__)
+
+// If CONDITION is not satisfied, emit an error log optionally using provided format and arguments,
+// and execute ACTION (for example return)
+#define CODEQL_EXPECT_OR(ACTION, CONDITION, ...) \
+  CODEQL_ASSERT_IMPL(ERROR, ACTION, CONDITION, __VA_ARGS__)
+
+#define CODEQL_ASSERT_IMPL(LEVEL, ACTION, CONDITION, ...)                           \
+  do {                                                                              \
+    if (!(CONDITION)) {                                                             \
+      [[unlikely]] LOG_##LEVEL("assertion failed on " #CONDITION ". " __VA_ARGS__); \
+      codeql::Log::flush();                                                         \
+      ACTION;                                                                       \
+    }                                                                               \
+  } while (false)