src/sim/guest_abi.test.cc - public/gem5 - Git at Google

 /*
  * Copyright 2019 Google, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met: redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer;
  * redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
  * documentation and/or other materials provided with the distribution;
  * neither the name of the copyright holders nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include <gtest/gtest.h>

 #include <type_traits>
 #include <utility>

 #include "sim/guest_abi.hh"

 using namespace gem5;

 namespace gem5
 {
 // Fake ThreadContext which holds data and captures results.
 class ThreadContext
 {
   public:
     static const int ints[];
     static const double floats[];

     static const int DefaultIntResult;
     static const double DefaultFloatResult;

     int intResult = DefaultIntResult;
     double floatResult = DefaultFloatResult;

     int intOffset = 0;
 };

 const int ThreadContext::ints[] = {
     0, 1, 2, 3, 4, 5, 6, 7
 };
 const double ThreadContext::floats[] = {
     10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0
 };

 const int ThreadContext::DefaultIntResult = 0;
 const double ThreadContext::DefaultFloatResult = 0.0;

 } // namespace gem5

 // ABI anchor for an ABI which has 1D progress. Conceptually, this could be
 // because integer and floating point arguments are stored in the same
 // registers.
 struct TestABI_1D
 {
     using State = int;
 };

 // ABI anchor for an ABI which uses the prepare() hook.
 struct TestABI_Prepare
 {
     using State = int;
 };

 // ABI anchor for an ABI which has 2D progress. Conceptually, this could be
 // because integer and floating point arguments are stored in separate
 // registers.
 struct TestABI_2D
 {
     using State = std::pair<int, int>;
 };

 struct TestABI_TcInit
 {
     struct State
     {
         int pos;
         State(const ThreadContext *tc) : pos(tc->intOffset) {}
     };
 };

 namespace gem5
 {

 namespace guest_abi
 {

 // Hooks for the 1D ABI arguments and return value. Add 1 or 1.0 to return
 // values so we can tell they went through the right set of hooks.
 template <>
 struct Argument<TestABI_1D, int>
 {
     static int
     get(ThreadContext *tc, TestABI_1D::State &state)
     {
         return tc->ints[state++];
     }
 };

 template <typename Arg>
 struct Argument<TestABI_1D, Arg,
     typename std::enable_if_t<std::is_floating_point_v<Arg>>>
 {
     static Arg
     get(ThreadContext *tc, TestABI_1D::State &state)
     {
         return tc->floats[state++];
     }
 };

 template <>
 struct Result<TestABI_1D, int>
 {
     static void
     store(ThreadContext *tc, const int &ret)
     {
         tc->intResult = ret + 1;
     }
 };

 template <typename Ret>
 struct Result<TestABI_1D, Ret,
     typename std::enable_if_t<std::is_floating_point_v<Ret>>>
 {
     static void
     store(ThreadContext *tc, const Ret &ret)
     {
         tc->floatResult = ret + 1.0;
     }
 };

 // Hooks for the ABI which uses prepare(). It uses the same rules as the
 // 1D ABI for arguments, but allocates space for and discards return values
 // and returns integer arguments in reverse order.
 template <>
 struct Argument<TestABI_Prepare, int>
 {
     static int
     get(ThreadContext *tc, TestABI_Prepare::State &state)
     {
         return tc->ints[--state];
     }

     static void
     prepare(ThreadContext *tc, TestABI_Prepare::State &state)
     {
         state++;
     }
 };

 template <typename Ret>
 struct Result<TestABI_Prepare, Ret>
 {
     static void store(ThreadContext *tc, const Ret &ret) {}
     static void
     prepare(ThreadContext *tc, TestABI_Prepare::State &state)
     {
         state++;
     }
 };

 // Hooks for the 2D ABI arguments and return value. Add 2 or 2.0 to return
 // values so we can tell they went through the right set of hooks.

 template <>
 struct Argument<TestABI_2D, int>
 {
     static int
     get(ThreadContext *tc, TestABI_2D::State &state)
     {
         return tc->ints[state.first++];
     }
 };

 template <typename Arg>
 struct Argument<TestABI_2D, Arg,
     typename std::enable_if_t<std::is_floating_point_v<Arg>>>
 {
     static Arg
     get(ThreadContext *tc, TestABI_2D::State &state)
     {
         return tc->floats[state.second++];
     }
 };

 template <>
 struct Result<TestABI_2D, int>
 {
     static void
     store(ThreadContext *tc, const int &ret)
     {
         tc->intResult = ret + 2;
     }
 };

 template <typename Ret>
 struct Result<TestABI_2D, Ret,
     typename std::enable_if_t<std::is_floating_point_v<Ret>>>
 {
     static void
     store(ThreadContext *tc, const Ret &ret)
     {
         tc->floatResult = ret + 2.0;
     }
 };

 // Hooks for the TcInit ABI arguments.
 template <>
 struct Argument<TestABI_TcInit, int>
 {
     static int
     get(ThreadContext *tc, TestABI_TcInit::State &state)
     {
         return tc->ints[state.pos++];
     }
 };

 } // namespace guest_abi
 } // namespace gem5

 // Test function which verifies that its arguments reflect the 1D ABI and
 // which doesn't return anything.
 void
 testIntVoid(ThreadContext *tc, int a, float b, int c, double d,
             guest_abi::VarArgs<int,float,double> varargs)
 {
     EXPECT_EQ(a, tc->ints[0]);
     EXPECT_EQ(b, tc->floats[1]);
     EXPECT_EQ(c, tc->ints[2]);
     EXPECT_EQ(d, tc->floats[3]);

     EXPECT_EQ(varargs.get<int>(), tc->ints[4]);
     EXPECT_EQ(varargs.get<float>(), tc->floats[5]);
     EXPECT_EQ(varargs.get<double>(), tc->floats[6]);
 }

 // Test functions which verify that the return allocating ABI allocates space
 // for its return value successfully.
 void
 testPrepareVoid(ThreadContext *tc, int a, int b)
 {
     EXPECT_EQ(a, tc->ints[1]);
     EXPECT_EQ(b, tc->ints[0]);
 }

 int
 testPrepareInt(ThreadContext *tc, int a, int b)
 {
     EXPECT_EQ(a, tc->ints[2]);
     EXPECT_EQ(b, tc->ints[1]);
     return 0;
 }

 // Test function which verifies that its arguments reflect the 2D ABI and
 // which doesn't return anything.
 void
 test2DVoid(ThreadContext *tc, int a, float b, int c, double d,
            guest_abi::VarArgs<int,float,double> varargs)
 {
     EXPECT_EQ(a, tc->ints[0]);
     EXPECT_EQ(b, tc->floats[0]);
     EXPECT_EQ(c, tc->ints[1]);
     EXPECT_EQ(d, tc->floats[1]);

     EXPECT_EQ(varargs.get<int>(), tc->ints[2]);
     EXPECT_EQ(varargs.get<float>(), tc->floats[2]);
     EXPECT_EQ(varargs.get<double>(), tc->floats[3]);
 }

 void
 testTcInit(ThreadContext *tc, int a)
 {
     EXPECT_EQ(tc->intOffset, 2);
     EXPECT_EQ(a, tc->ints[2]);
 }

 // Test functions which returns various types of values.
 const int IntRetValue = 50;
 const float FloatRetValue = 3.14;
 const double DoubleRetValue = 12.34;

 int testIntRet(ThreadContext *tc) { return IntRetValue; }
 float testFloatRet(ThreadContext *tc) { return FloatRetValue; }
 double testDoubleRet(ThreadContext *tc) { return DoubleRetValue; }


 // The actual test bodies.
 TEST(GuestABITest, ABI_1D_args)
 {
     ThreadContext tc;
     invokeSimcall<TestABI_1D>(&tc, testIntVoid);
     EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
     EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
 }

 TEST(GuestABITest, ABI_Prepare)
 {
     ThreadContext tc;
     invokeSimcall<TestABI_Prepare>(&tc, testPrepareVoid);
     invokeSimcall<TestABI_Prepare>(&tc, testPrepareInt);
 }

 TEST(GuestABITest, ABI_2D_args)
 {
     ThreadContext tc;
     invokeSimcall<TestABI_2D>(&tc, test2DVoid);
     EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
     EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
 }

 TEST(GuestABITest, ABI_TC_init)
 {
     ThreadContext tc;
     tc.intOffset = 2;
     invokeSimcall<TestABI_TcInit>(&tc, testTcInit);
 }

 TEST(GuestABITest, ABI_returns)
 {
     // 1D returns.
     {
         ThreadContext tc;
         int ret = invokeSimcall<TestABI_1D>(&tc, testIntRet);
         EXPECT_EQ(ret, IntRetValue);
         EXPECT_EQ(tc.intResult, IntRetValue + 1);
         EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
     }
     {
         ThreadContext tc;
         float ret = invokeSimcall<TestABI_1D>(&tc, testFloatRet);
         EXPECT_EQ(ret, FloatRetValue);
         EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
         EXPECT_EQ(tc.floatResult, FloatRetValue + 1.0);
     }
     {
         ThreadContext tc;
         double ret = invokeSimcall<TestABI_1D>(&tc, testDoubleRet);
         EXPECT_EQ(ret, DoubleRetValue);
         EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
         EXPECT_EQ(tc.floatResult, DoubleRetValue + 1.0);
     }
     {
         // Disable storing the return value in the ThreadContext.
         ThreadContext tc;
         int ret = invokeSimcall<TestABI_1D, false>(&tc, testIntRet);
         EXPECT_EQ(ret, IntRetValue);
         EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
         EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
     }


     // 2D returns.
     {
         ThreadContext tc;
         int ret = invokeSimcall<TestABI_2D>(&tc, testIntRet);
         EXPECT_EQ(ret, IntRetValue);
         EXPECT_EQ(tc.intResult, IntRetValue + 2);
         EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
     }
     {
         ThreadContext tc;
         float ret = invokeSimcall<TestABI_2D>(&tc, testFloatRet);
         EXPECT_EQ(ret, FloatRetValue);
         EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
         EXPECT_EQ(tc.floatResult, FloatRetValue + 2.0);
     }
     {
         ThreadContext tc;
         double ret = invokeSimcall<TestABI_2D>(&tc, testDoubleRet);
         EXPECT_EQ(ret, DoubleRetValue);
         EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
         EXPECT_EQ(tc.floatResult, DoubleRetValue + 2.0);
     }
 }

 TEST(GuestABITest, dumpSimcall)
 {
     ThreadContext tc;
     std::string dump = dumpSimcall<TestABI_1D>("test", &tc, testIntVoid);
     EXPECT_EQ(dump, "test(0, 11, 2, 13, ...)");
 }

 TEST(GuestABITest, isVarArgs)
 {
     EXPECT_TRUE(guest_abi::IsVarArgsV<guest_abi::VarArgs<int>>);
     EXPECT_FALSE(guest_abi::IsVarArgsV<int>);
     EXPECT_FALSE(guest_abi::IsVarArgsV<double>);
     struct FooStruct {};
     EXPECT_FALSE(guest_abi::IsVarArgsV<FooStruct>);
     union FooUnion {};
     EXPECT_FALSE(guest_abi::IsVarArgsV<FooUnion>);
 }
	/*
	* Copyright 2019 Google, Inc.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met: redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer;
	* redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution;
	* neither the name of the copyright holders nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <gtest/gtest.h>

	#include <type_traits>
	#include <utility>

	#include "sim/guest_abi.hh"

	using namespace gem5;

	namespace gem5
	{
	// Fake ThreadContext which holds data and captures results.
	class ThreadContext
	{
	public:
	static const int ints[];
	static const double floats[];

	static const int DefaultIntResult;
	static const double DefaultFloatResult;

	int intResult = DefaultIntResult;
	double floatResult = DefaultFloatResult;

	int intOffset = 0;
	};

	const int ThreadContext::ints[] = {
	0, 1, 2, 3, 4, 5, 6, 7
	};
	const double ThreadContext::floats[] = {
	10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0
	};

	const int ThreadContext::DefaultIntResult = 0;
	const double ThreadContext::DefaultFloatResult = 0.0;

	} // namespace gem5

	// ABI anchor for an ABI which has 1D progress. Conceptually, this could be
	// because integer and floating point arguments are stored in the same
	// registers.
	struct TestABI_1D
	{
	using State = int;
	};

	// ABI anchor for an ABI which uses the prepare() hook.
	struct TestABI_Prepare
	{
	using State = int;
	};

	// ABI anchor for an ABI which has 2D progress. Conceptually, this could be
	// because integer and floating point arguments are stored in separate
	// registers.
	struct TestABI_2D
	{
	using State = std::pair<int, int>;
	};

	struct TestABI_TcInit
	{
	struct State
	{
	int pos;
	State(const ThreadContext *tc) : pos(tc->intOffset) {}
	};
	};

	namespace gem5
	{

	namespace guest_abi
	{

	// Hooks for the 1D ABI arguments and return value. Add 1 or 1.0 to return
	// values so we can tell they went through the right set of hooks.
	template <>
	struct Argument<TestABI_1D, int>
	{
	static int
	get(ThreadContext *tc, TestABI_1D::State &state)
	{
	return tc->ints[state++];
	}
	};

	template <typename Arg>
	struct Argument<TestABI_1D, Arg,
	typename std::enable_if_t<std::is_floating_point_v<Arg>>>
	{
	static Arg
	get(ThreadContext *tc, TestABI_1D::State &state)
	{
	return tc->floats[state++];
	}
	};

	template <>
	struct Result<TestABI_1D, int>
	{
	static void
	store(ThreadContext *tc, const int &ret)
	{
	tc->intResult = ret + 1;
	}
	};

	template <typename Ret>
	struct Result<TestABI_1D, Ret,
	typename std::enable_if_t<std::is_floating_point_v<Ret>>>
	{
	static void
	store(ThreadContext *tc, const Ret &ret)
	{
	tc->floatResult = ret + 1.0;
	}
	};

	// Hooks for the ABI which uses prepare(). It uses the same rules as the
	// 1D ABI for arguments, but allocates space for and discards return values
	// and returns integer arguments in reverse order.
	template <>
	struct Argument<TestABI_Prepare, int>
	{
	static int
	get(ThreadContext *tc, TestABI_Prepare::State &state)
	{
	return tc->ints[--state];
	}

	static void
	prepare(ThreadContext *tc, TestABI_Prepare::State &state)
	{
	state++;
	}
	};

	template <typename Ret>
	struct Result<TestABI_Prepare, Ret>
	{
	static void store(ThreadContext *tc, const Ret &ret) {}
	static void
	prepare(ThreadContext *tc, TestABI_Prepare::State &state)
	{
	state++;
	}
	};

	// Hooks for the 2D ABI arguments and return value. Add 2 or 2.0 to return
	// values so we can tell they went through the right set of hooks.

	template <>
	struct Argument<TestABI_2D, int>
	{
	static int
	get(ThreadContext *tc, TestABI_2D::State &state)
	{
	return tc->ints[state.first++];
	}
	};

	template <typename Arg>
	struct Argument<TestABI_2D, Arg,
	typename std::enable_if_t<std::is_floating_point_v<Arg>>>
	{
	static Arg
	get(ThreadContext *tc, TestABI_2D::State &state)
	{
	return tc->floats[state.second++];
	}
	};

	template <>
	struct Result<TestABI_2D, int>
	{
	static void
	store(ThreadContext *tc, const int &ret)
	{
	tc->intResult = ret + 2;
	}
	};

	template <typename Ret>
	struct Result<TestABI_2D, Ret,
	typename std::enable_if_t<std::is_floating_point_v<Ret>>>
	{
	static void
	store(ThreadContext *tc, const Ret &ret)
	{
	tc->floatResult = ret + 2.0;
	}
	};

	// Hooks for the TcInit ABI arguments.
	template <>
	struct Argument<TestABI_TcInit, int>
	{
	static int
	get(ThreadContext *tc, TestABI_TcInit::State &state)
	{
	return tc->ints[state.pos++];
	}
	};

	} // namespace guest_abi
	} // namespace gem5

	// Test function which verifies that its arguments reflect the 1D ABI and
	// which doesn't return anything.
	void
	testIntVoid(ThreadContext *tc, int a, float b, int c, double d,
	guest_abi::VarArgs<int,float,double> varargs)
	{
	EXPECT_EQ(a, tc->ints[0]);
	EXPECT_EQ(b, tc->floats[1]);
	EXPECT_EQ(c, tc->ints[2]);
	EXPECT_EQ(d, tc->floats[3]);

	EXPECT_EQ(varargs.get<int>(), tc->ints[4]);
	EXPECT_EQ(varargs.get<float>(), tc->floats[5]);
	EXPECT_EQ(varargs.get<double>(), tc->floats[6]);
	}

	// Test functions which verify that the return allocating ABI allocates space
	// for its return value successfully.
	void
	testPrepareVoid(ThreadContext *tc, int a, int b)
	{
	EXPECT_EQ(a, tc->ints[1]);
	EXPECT_EQ(b, tc->ints[0]);
	}

	int
	testPrepareInt(ThreadContext *tc, int a, int b)
	{
	EXPECT_EQ(a, tc->ints[2]);
	EXPECT_EQ(b, tc->ints[1]);
	return 0;
	}

	// Test function which verifies that its arguments reflect the 2D ABI and
	// which doesn't return anything.
	void
	test2DVoid(ThreadContext *tc, int a, float b, int c, double d,
	guest_abi::VarArgs<int,float,double> varargs)
	{
	EXPECT_EQ(a, tc->ints[0]);
	EXPECT_EQ(b, tc->floats[0]);
	EXPECT_EQ(c, tc->ints[1]);
	EXPECT_EQ(d, tc->floats[1]);

	EXPECT_EQ(varargs.get<int>(), tc->ints[2]);
	EXPECT_EQ(varargs.get<float>(), tc->floats[2]);
	EXPECT_EQ(varargs.get<double>(), tc->floats[3]);
	}

	void
	testTcInit(ThreadContext *tc, int a)
	{
	EXPECT_EQ(tc->intOffset, 2);
	EXPECT_EQ(a, tc->ints[2]);
	}

	// Test functions which returns various types of values.
	const int IntRetValue = 50;
	const float FloatRetValue = 3.14;
	const double DoubleRetValue = 12.34;

	int testIntRet(ThreadContext *tc) { return IntRetValue; }
	float testFloatRet(ThreadContext *tc) { return FloatRetValue; }
	double testDoubleRet(ThreadContext *tc) { return DoubleRetValue; }


	// The actual test bodies.
	TEST(GuestABITest, ABI_1D_args)
	{
	ThreadContext tc;
	invokeSimcall<TestABI_1D>(&tc, testIntVoid);
	EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
	EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
	}

	TEST(GuestABITest, ABI_Prepare)
	{
	ThreadContext tc;
	invokeSimcall<TestABI_Prepare>(&tc, testPrepareVoid);
	invokeSimcall<TestABI_Prepare>(&tc, testPrepareInt);
	}

	TEST(GuestABITest, ABI_2D_args)
	{
	ThreadContext tc;
	invokeSimcall<TestABI_2D>(&tc, test2DVoid);
	EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
	EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
	}

	TEST(GuestABITest, ABI_TC_init)
	{
	ThreadContext tc;
	tc.intOffset = 2;
	invokeSimcall<TestABI_TcInit>(&tc, testTcInit);
	}

	TEST(GuestABITest, ABI_returns)
	{
	// 1D returns.
	{
	ThreadContext tc;
	int ret = invokeSimcall<TestABI_1D>(&tc, testIntRet);
	EXPECT_EQ(ret, IntRetValue);
	EXPECT_EQ(tc.intResult, IntRetValue + 1);
	EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
	}
	{
	ThreadContext tc;
	float ret = invokeSimcall<TestABI_1D>(&tc, testFloatRet);
	EXPECT_EQ(ret, FloatRetValue);
	EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
	EXPECT_EQ(tc.floatResult, FloatRetValue + 1.0);
	}
	{
	ThreadContext tc;
	double ret = invokeSimcall<TestABI_1D>(&tc, testDoubleRet);
	EXPECT_EQ(ret, DoubleRetValue);
	EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
	EXPECT_EQ(tc.floatResult, DoubleRetValue + 1.0);
	}
	{
	// Disable storing the return value in the ThreadContext.
	ThreadContext tc;
	int ret = invokeSimcall<TestABI_1D, false>(&tc, testIntRet);
	EXPECT_EQ(ret, IntRetValue);
	EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
	EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
	}


	// 2D returns.
	{
	ThreadContext tc;
	int ret = invokeSimcall<TestABI_2D>(&tc, testIntRet);
	EXPECT_EQ(ret, IntRetValue);
	EXPECT_EQ(tc.intResult, IntRetValue + 2);
	EXPECT_EQ(tc.floatResult, tc.DefaultFloatResult);
	}
	{
	ThreadContext tc;
	float ret = invokeSimcall<TestABI_2D>(&tc, testFloatRet);
	EXPECT_EQ(ret, FloatRetValue);
	EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
	EXPECT_EQ(tc.floatResult, FloatRetValue + 2.0);
	}
	{
	ThreadContext tc;
	double ret = invokeSimcall<TestABI_2D>(&tc, testDoubleRet);
	EXPECT_EQ(ret, DoubleRetValue);
	EXPECT_EQ(tc.intResult, tc.DefaultIntResult);
	EXPECT_EQ(tc.floatResult, DoubleRetValue + 2.0);
	}
	}

	TEST(GuestABITest, dumpSimcall)
	{
	ThreadContext tc;
	std::string dump = dumpSimcall<TestABI_1D>("test", &tc, testIntVoid);
	EXPECT_EQ(dump, "test(0, 11, 2, 13, ...)");
	}

	TEST(GuestABITest, isVarArgs)
	{
	EXPECT_TRUE(guest_abi::IsVarArgsV<guest_abi::VarArgs<int>>);
	EXPECT_FALSE(guest_abi::IsVarArgsV<int>);
	EXPECT_FALSE(guest_abi::IsVarArgsV<double>);
	struct FooStruct {};
	EXPECT_FALSE(guest_abi::IsVarArgsV<FooStruct>);
	union FooUnion {};
	EXPECT_FALSE(guest_abi::IsVarArgsV<FooUnion>);
	}