lifetime_analysis/test/execution_order.cc

// Part of the Crubit project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

// Tests that execution order is taken into account correctly.

#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "lifetime_analysis/test/lifetime_analysis_test.h"

namespace clang {
namespace tidy {
namespace lifetimes {
namespace {

TEST_F(LifetimeAnalysisTest, OrderOfOperations_OrderOfExecution) {
  // This is a regression test for a wrong result that was generated by the
  // constraint-based approach.

  EXPECT_THAT(GetLifetimes(R"(
    int* target(int* p) {
      int* p2 = p;
      int local = 42;
      p = &local;
      return p2;
    }
  )"),
              LifetimesAre({{"target", "a -> a"}}));
}

TEST_F(LifetimeAnalysisTest, OrderOfOperations_OrderOfExecution2) {
  // This is a regression test for a wrong result that was generated by the
  // constraint-based approach.

  EXPECT_THAT(GetLifetimes(R"(
    int* target(int* p) {
      int **pp = &p;
      int local = 42;
      int* p2;
      pp = &p2;
      *pp = &local;
      return p;
    }
  )"),
              LifetimesAre({{"target", "a -> a"}}));
}

TEST_F(LifetimeAnalysisTest, OrderOfOperations_Assignment) {
  EXPECT_THAT(GetLifetimes(R"(
    int* target(int* p) {
      int* p2 = p;
      int local = 42;
      p2 = &local;
      p2 = p;
      return p2;
    }
  )"),
              LifetimesAre({{"target", "a -> a"}}));
}

TEST_F(LifetimeAnalysisTest, TakeAReferenceLater) {
  EXPECT_THAT(GetLifetimes(R"(
    int* target(int* p) {
      int* p2 = p;
      int local = 42;
      p = &local;
      int** pp = &p;
      return p2;
    }
  )"),
              LifetimesAre({{"target", "a -> a"}}));
}

TEST_F(LifetimeAnalysisTest, ChainedAssignment) {
  EXPECT_THAT(GetLifetimes(R"(
    int* target(int* a, int* b, int* c) {
      a = b = c;
      return a;
    }
  )"),
              LifetimesAre({{"target", "a, b, c -> c"}}));
}

TEST_F(LifetimeAnalysisTest, ParenExpr) {
  EXPECT_THAT(GetLifetimes(R"(
    int* target(int* a, int* b, int* c) {
      a = (b = c);
      return a;
    }
  )"),
              LifetimesAre({{"target", "a, b, c -> c"}}));
}

TEST_F(LifetimeAnalysisTest, ParenExpr2) {
  EXPECT_THAT(GetLifetimes(R"(
    int* target(int* a, int* b, int* c) {
      (a = b) = c;
      return a;
    }
  )"),
              LifetimesAre({{"target", "a, b, c -> c"}}));
}

}  // namespace
}  // namespace lifetimes
}  // namespace tidy
}  // namespace clang