refactor: panic: add ASSERT_EQ and similar, add test

include/silo/common/panic.h

@@ -56,6 +56,51 @@ namespace silo::common {
 
 [[noreturn]] void assertFailure(const char* msg, const char* file, int line);
 
+#define INTERNAL_ASSERT_OP_(prefix_str, e1, op, e2)                                             \
+   do {                                                                                         \
+      auto v1 = (e1);                                                                           \
+      auto v2 = (e2);                                                                           \
+      if (!(v1 op v2)) {                                                                        \
+         silo::common::assertOpFailure(                                                         \
+            prefix_str, #e1, #op, #e2, fmt::format("{} " #op " {}", v1, v2), __FILE__, __LINE__ \
+         );                                                                                     \
+      }                                                                                         \
+   } while (0)
+
+#define ASSERT_OP_(partial_prefix, e1, op, e2) \
+   INTERNAL_ASSERT_OP_("ASSERT_" #partial_prefix, e1, op, e2)
+
+[[noreturn]] void assertOpFailure(
+   const char* prefix,
+   const char* e1_str,
+   const char* op_str,
+   const char* e2_str,
+   const std::string& values,
+   const char* file,
+   int line
+);
+
+/// Asserts that the two given expressions evaluate to the same
+/// value, compared via `==`. On failure calls `panic` with the stringification of the code and the
+/// two values passed through fmt::format, plus file/line information. Always compiled in, if
+/// performance overrides safety, use `DEBUG_ASSERT_EQ` instead.
+#define ASSERT_EQ(e1, e2) ASSERT_OP_(EQ, e1, ==, e2)
+
+/// Like ASSERT_EQ but asserts that `e1 <= e2`.
+#define ASSERT_LE(e1, e2) ASSERT_OP_(LE, e1, <=, e2)
+
+/// Like ASSERT_EQ but asserts that `e1 < e2`.
+#define ASSERT_LT(e1, e2) ASSERT_OP_(LT, e1, <, e2)
+
+/// Like ASSERT_EQ but asserts that `e1 >= e2`.
+#define ASSERT_GE(e1, e2) ASSERT_OP_(GE, e1, >=, e2)
+
+/// Like ASSERT_EQ but asserts that `e1 > e2`.
+#define ASSERT_GT(e1, e2) ASSERT_OP_(GT, e1, >, e2)
+
+/// Like ASSERT_EQ but asserts that `e1 != e2`.
+#define ASSERT_NE(e1, e2) ASSERT_OP_(NE, e1, !=, e2)
+
 /// `DEBUG_ASSERT` is like `ASSERT`, but for cases where performance
 /// is more important than verification in production: instantiations
 /// are only active when compiling SILO in debug (via
@@ -90,4 +135,30 @@ namespace silo::common {
 
 [[noreturn]] void debugAssertFailure(const char* msg, const char* file, int line);
 
+#define DEBUG_ASSERT_OP_(partial_prefix, e1, op, e2)                       \
+   do {                                                                    \
+      if (DEBUG_ASSERTIONS) {                                              \
+         INTERNAL_ASSERT_OP_("DEBUG_ASSERT_" #partial_prefix, e1, op, e2); \
+      }                                                                    \
+   } while (0)
+
+/// Like `ASSERT_EQ`, but like `DEBUG_ASSERT`, for cases where
+/// performance is more important than verification in production.
+#define DEBUG_ASSERT_EQ(e1, e2) DEBUG_ASSERT_OP_(EQ, e1, ==, e2)
+
+/// Like DEBUG_ASSERT_EQ but asserts that `e1 <= e2`.
+#define DEBUG_ASSERT_LE(e1, e2) DEBUG_ASSERT_OP_(LE, e1, <=, e2)
+
+/// Like DEBUG_ASSERT_EQ but asserts that `e1 < e2`.
+#define DEBUG_ASSERT_LT(e1, e2) DEBUG_ASSERT_OP_(LT, e1, <, e2)
+
+/// Like DEBUG_ASSERT_EQ but asserts that `e1 >= e2`.
+#define DEBUG_ASSERT_GE(e1, e2) DEBUG_ASSERT_OP_(GE, e1, >=, e2)
+
+/// Like DEBUG_ASSERT_EQ but asserts that `e1 > e2`.
+#define DEBUG_ASSERT_GT(e1, e2) DEBUG_ASSERT_OP_(GT, e1, >, e2)
+
+/// Like DEBUG_ASSERT_EQ but asserts that `e1 != e2`.
+#define DEBUG_ASSERT_NE(e1, e2) DEBUG_ASSERT_OP_(NE, e1, !=, e2)
+
 }  // namespace silo::common

src/silo/common/panic.cpp

@@ -4,6 +4,8 @@
 #include <cstring>
 #include <iostream>
 
+#include <fmt/format.h>
+
 namespace silo::common {
 
 namespace {
@@ -53,6 +55,18 @@ namespace {
    panic("ASSERT failure: ", msg, file, line);
 }
 
+[[noreturn]] void assertOpFailure(
+   const char* prefix,
+   const char* e1_str,
+   const char* op_str,
+   const char* e2_str,
+   const std::string& values,
+   const char* file,
+   int line
+) {
+   panic(fmt::format("{} failure: {} {} {}: ", prefix, e1_str, op_str, e2_str), values, file, line);
+}
+
 [[noreturn]] void debugAssertFailure(const char* msg, const char* file, int line) {
    panic("DEBUG_ASSERT failure: ", msg, file, line);
 }

src/silo/common/panic.test.cpp

@@ -0,0 +1,101 @@
+#include <fmt/format.h>
+#include <gtest/gtest.h>
+#include <cctype>
+#include <cstdlib>
+
+/* get rid of gtest's definition, we're going to test our own */
+#undef ASSERT_EQ
+
+#include "silo/common/panic.h"
+
+namespace {
+// Since we can't use ASSERT_EQ from gtest, make a simple
+// replacement. `expected` should be without the file:line
+// information, whereas `got` should contain it.
+void assertMsg(std::string got, std::string expected) {
+   auto start = got.substr(0, expected.size());
+   if (start != expected) {
+      throw std::runtime_error(
+         fmt::format("expected '{}', got '{}' (full: '{}')", expected, start, got)
+      );
+   }
+   auto remainder = got.substr(expected.size(), got.size() - expected.size());
+   if (remainder.size() < 4) {
+      throw std::runtime_error("missing ' at ..' part of exception message");
+   }
+   auto the_at = remainder.substr(0, 4);
+   if (the_at != std::string(" at ")) {
+      throw std::runtime_error(fmt::format("expected '{}', got '{}'", " at ", the_at));
+   }
+
+   const char last = remainder[remainder.size() - 1];
+   if (!isdigit(last)) {
+      throw std::runtime_error(fmt::format("expected a digit at the end of '{}'", got));
+   }
+   // good enough, ignore the rest of the remainder.
+}
+}  // namespace
+
+// NOLINTNEXTLINE(readability-identifier-naming,readability-function-cognitive-complexity)
+TEST(panic, assertEqPanicModes) {
+   ASSERT_EQ(1 + 1, 2);
+
+   setenv("SILO_PANIC", "", 1);
+   try {
+      ASSERT_EQ(1 + 1, 3);
+   } catch (const std::exception& ex) {
+      assertMsg(ex.what(), "ASSERT_EQ failure: 1 + 1 == 3: 2 == 3");
+   };
+
+   setenv("SILO_PANIC", "abort", 1);
+   ASSERT_DEATH(ASSERT_EQ(1 + 1, 3), "ASSERT_EQ failure: 1 \\+ 1 == 3: 2 == 3");
+
+   // revert it back
+   setenv("SILO_PANIC", "", 1);
+}
+
+// NOLINTNEXTLINE(readability-identifier-naming,readability-function-cognitive-complexity)
+TEST(panic, debugAssertBehavesAsPerCompilationMode) {
+   // should never complain
+   DEBUG_ASSERT(1 + 1 == 2);
+
+   // Check that DEBUG_ASSERT is active if DEBUG_ASSERTIONS==1, off
+   // otherwise; each of those branches is only tested when compiling
+   // the unit tests in debug or release mode, respectively.
+
+#if DEBUG_ASSERTIONS
+
+   setenv("SILO_PANIC", "", 1);
+   try {
+      DEBUG_ASSERT(1 + 1 == 3);
+   } catch (const std::exception& ex) {
+      assertMsg(ex.what(), "DEBUG_ASSERT failure: 1 + 1 == 3");
+   };
+
+#else
+   // check that DEBUG_ASSERT is disabled
+   DEBUG_ASSERT(1 + 1 == 3);
+#endif
+}
+
+// NOLINTNEXTLINE(readability-identifier-naming,readability-function-cognitive-complexity)
+TEST(panic, debugAssertGeWorks) {
+   // stand-in for all the DEBUG_ASSERT_* variants
+
+   DEBUG_ASSERT_GE(1 + 5, 6);
+   DEBUG_ASSERT_GE(1 + 5, 5);
+
+#if DEBUG_ASSERTIONS
+
+   setenv("SILO_PANIC", "", 1);
+   try {
+      DEBUG_ASSERT_GE(1 + 5, 7);
+   } catch (const std::exception& ex) {
+      assertMsg(ex.what(), "DEBUG_ASSERT_GE failure: 1 + 5 >= 7: 6 >= 7");
+   };
+
+#else
+   // check that DEBUG_ASSERT is disabled
+   DEBUG_ASSERT_GE(1 + 5, 7);
+#endif
+}