cf1d9ee857
This commit reimplements the C# API in terms of a Wasmtime linker. It removes the custom binding implementation that was based on reflection in favor of the linker's implementation. This should make the C# API a little closer to the Rust API. The `Engine` and `Store` types have been hidden behind the `Host` type which is responsible for hosting WebAssembly module instances. Documentation and tests have been updated.
73 lines
2.3 KiB
C#
73 lines
2.3 KiB
C#
using FluentAssertions;
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using System;
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using System.Linq;
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using Xunit;
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namespace Wasmtime.Tests
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{
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public class FunctionThunkingFixture : ModuleFixture
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{
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protected override string ModuleFileName => "FunctionThunking.wat";
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}
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public class FunctionThunkingTests : IClassFixture<FunctionThunkingFixture>
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{
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const string THROW_MESSAGE = "Test error message for wasmtime dotnet unit tests.";
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public FunctionThunkingTests(FunctionThunkingFixture fixture)
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{
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Fixture = fixture;
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Fixture.Host.DefineFunction("env", "add", (int x, int y) => x + y);
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Fixture.Host.DefineFunction("env", "swap", (int x, int y) => (y, x));
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Fixture.Host.DefineFunction("env", "do_throw", () => throw new Exception(THROW_MESSAGE));
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Fixture.Host.DefineFunction("env", "check_string", (Caller caller, int address, int length) => {
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caller.GetMemory("mem").ReadString(address, length).Should().Be("Hello World");
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});
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}
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private FunctionThunkingFixture Fixture { get; }
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[Fact]
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public void ItBindsImportMethodsAndCallsThemCorrectly()
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{
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using dynamic instance = Fixture.Host.Instantiate(Fixture.Module);
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int x = instance.add(40, 2);
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x.Should().Be(42);
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x = instance.add(22, 5);
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x.Should().Be(27);
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object[] results = instance.swap(10, 100);
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results.Should().Equal(new object[] { 100, 10 });
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instance.check_string();
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// Collect garbage to make sure delegate function pointers pasted to wasmtime are rooted.
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GC.Collect();
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GC.WaitForPendingFinalizers();
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x = instance.add(1970, 50);
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x.Should().Be(2020);
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results = instance.swap(2020, 1970);
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results.Should().Equal(new object[] { 1970, 2020 });
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instance.check_string();
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}
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[Fact]
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public void ItPropagatesExceptionsToCallersViaTraps()
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{
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using dynamic instance = Fixture.Host.Instantiate(Fixture.Module);
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Action action = () => instance.do_throw();
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action
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.Should()
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.Throw<TrapException>()
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.WithMessage(THROW_MESSAGE);
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}
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}
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}
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