test_safefetch.cpp

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#include "precompiled.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/safefetch.inline.hpp"
#include "runtime/vmOperations.hpp"
#include "runtime/vmThread.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/vmError.hpp"
#include "unittest.hpp"

static const intptr_t pattern = LP64_ONLY(0xABCDABCDABCDABCDULL) NOT_LP64(0xABCDABCD);
static intptr_t* invalid_address = (intptr_t*)VMError::segfault_address;

TEST_VM(os, safefetch_can_use) {
  // Once VM initialization is through,
  // safefetch should work on every platform.
  ASSERT_TRUE(CanUseSafeFetch32());
}

TEST_VM(os, safefetch_positive) {
  intptr_t v = pattern;
  intptr_t a = SafeFetchN(&v, 1);
  ASSERT_EQ(v, a);
}

TEST_VM(os, safefetch_negative) {
  intptr_t a = SafeFetchN(invalid_address, pattern);
  ASSERT_EQ(pattern, a);
  a = SafeFetchN(invalid_address, ~pattern);
  ASSERT_EQ(~pattern, a);
}

class VM_TestSafeFetchAtSafePoint : public VM_GTestExecuteAtSafepoint {
public:
  void doit() {
    // Regression test for JDK-8257828
    // Should not crash.
    intptr_t a = SafeFetchN(invalid_address, pattern);
    ASSERT_EQ(pattern, a);
    a = SafeFetchN(invalid_address, ~pattern);
    ASSERT_EQ(~pattern, a);
  }
};

TEST_VM(os, safefetch_negative_at_safepoint) {
  VM_TestSafeFetchAtSafePoint op;
  ThreadInVMfromNative invm(JavaThread::current());
  VMThread::execute(&op);
}