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StackallocTests.cs
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using System;
using Cecilifier.Core.Tests.Tests.Unit.Framework;
using NUnit.Framework;
namespace Cecilifier.Core.Tests.Tests.Unit;
[TestFixture]
public class StackallocTests : CecilifierUnitTestBase
{
[Test]
public void Test_Issue_134_Stackalloc_ArrayInitialization_Character()
{
var code = @"using System; class Foo { unsafe void Bar() { char* ch = stackalloc char[] { 'A', 'V' }; } }";
var result = RunCecilifier(code);
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Contains.Substring("Stind_I2"));
Assert.That(cecilifiedCode, Contains.Substring("Sizeof, assembly.MainModule.TypeSystem.Char"));
}
[Test]
public void Test_Issue_134_Stackalloc_ArrayInitialization_Boolean()
{
var code = @"using System; class Foo { unsafe void Bar() { bool* bp = stackalloc bool[] { true, false }; } }";
var result = RunCecilifier(code);
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Contains.Substring("Stind_I1"));
Assert.That(cecilifiedCode, Does.Not.Contains("Sizeof, assembly.MainModule.TypeSystem.Boolean"));
}
[TestCase("byte", nameof(Byte), sizeof(byte), "Stind_I1", TestName = "byte")]
[TestCase("sbyte", nameof(SByte), sizeof(sbyte), "Stind_I1", TestName = "sbyte")]
[TestCase("int", nameof(Int32), sizeof(int), "Stind_I4", TestName = "int")]
[TestCase("uint", nameof(UInt32), sizeof(uint), "Stind_I4", TestName = "uint")]
[TestCase("short", nameof(Int16), sizeof(short), "Stind_I2", TestName = "short")]
[TestCase("ushort", nameof(UInt16), sizeof(ushort), "Stind_I2", TestName = "ushort")]
[TestCase("long", nameof(Int64), sizeof(long), "Stind_I8", TestName = "long")]
[TestCase("ulong", nameof(UInt64), sizeof(ulong), "Stind_I8", TestName = "ulong")]
[TestCase("double", nameof(Double), sizeof(double), "Stind_R8", TestName = nameof(Double))]
[TestCase("float", nameof(Single), sizeof(Single), "Stind_R4", TestName = nameof(Single))]
public void Test_Issue_134_Stackalloc_ArrayInitialization_Numeric(string type, string fclTypeName, int sizeofElement, string expectedStindOpCode)
{
var code = @$"using System; class Foo {{ unsafe void Bar() {{ {type}* b = stackalloc {type}[] {{ 1, 2 }}; }} }}";
var result = RunCecilifier(code);
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
var sizeOfElementSupport = sizeofElement == 1
? string.Empty
: @$"\1Sizeof, assembly.MainModule.TypeSystem.{fclTypeName}\);\s+" +
@"\1Mul_Ovf_Un\);\s+";
Assert.That(cecilifiedCode, Does.Match(@$"var l_b_3 = new VariableDefinition\(assembly.MainModule.TypeSystem.{fclTypeName}.MakePointerType\(\)\);\s+"
+ @"m_bar_1.Body.Variables.Add\(l_b_3\);\s+"
+ @"(.+\.Emit\(OpCodes\.)Ldc_I4, 2\);\s+"
+ @"\1Conv_U\);\s+"
+ sizeOfElementSupport
+ @"\1Localloc\);\s+"
+ @"\1Dup\);\s+"
+ @"\1Ldc_I4, 1\);\s+"
+ @$"\1{expectedStindOpCode}\);\s+"
+ @"\1Dup\);\s+"
+ @$"\1Ldc_I4, {sizeofElement}\);\s+"
+ @"\1Add\);\s+"
+ @"\1Ldc_I4, 2\);\s+"
+ @$"\1{expectedStindOpCode}\);\s+"
+ @"\1Stloc, l_b_3\);\s+"
+ @"\1Ret\);\s+"));
}
[Test]
public void Test_Issue_133_Assign_StackallocToSpan()
{
var result = RunCecilifier(@"using System; class Foo { void Bar() { Span<byte> s = stackalloc byte[1000]; } }");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Does.Match(@".+//Span<byte> s = stackalloc byte\[1000\];\s+" +
@"var l_s_3 = new VariableDefinition\(assembly.MainModule.ImportReference\(typeof\(System.Span<>\)\).MakeGenericInstanceType\(assembly.MainModule.TypeSystem.Byte\)\);\s+" +
@"m_bar_1.Body.Variables.Add\(l_s_3\);\s+" +
@"il_bar_2.Emit\(OpCodes.Ldc_I4, 1000\); // 1000 \(elements\) \* 1 \(bytes per element\)\s+" +
@"il_bar_2.Emit\(OpCodes.Conv_U\);\s+" +
@"il_bar_2.Emit\(OpCodes.Localloc\);\s+" +
@"il_bar_2.Emit\(OpCodes.Ldc_I4, 1000\);\s+"));
Assert.That(cecilifiedCode, Does.Match(
@"il_bar_2.Emit\(OpCodes.Newobj, assembly.MainModule.ImportReference\(l_spanCtor_4\)\);\s+" +
@"il_bar_2.Emit\(OpCodes.Stloc, l_s_3\);\s+"));
}
[Test]
public void Test_Issue_133_Span_InitializedByStackallocWithSizeFromParameter_PassedAsParameter()
{
var result = RunCecilifier(@"using System; class Foo { static void Bar(Span<int> span) { Bar(stackalloc int[1000]); } }");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
var expectedLines = new[]
{
"il_bar_2.Emit(OpCodes.Ldc_I4, 4000);", "il_bar_2.Emit(OpCodes.Conv_U);", "il_bar_2.Emit(OpCodes.Localloc);", "il_bar_2.Emit(OpCodes.Ldc_I4, 4000);",
"var l_spanCtor_4 = new MethodReference(\".ctor\", assembly.MainModule.TypeSystem.Void, assembly.MainModule.ImportReference(typeof(System.Span<>)).MakeGenericInstanceType(assembly.MainModule.TypeSystem.Int32)) { HasThis = true };",
"l_spanCtor_4.Parameters.Add(new ParameterDefinition(\"ptr\", ParameterAttributes.None, assembly.MainModule.ImportReference(typeof(void*))));",
"l_spanCtor_4.Parameters.Add(new ParameterDefinition(\"length\", ParameterAttributes.None, assembly.MainModule.TypeSystem.Int32));",
"il_bar_2.Emit(OpCodes.Newobj, assembly.MainModule.ImportReference(l_spanCtor_4));", "il_bar_2.Emit(OpCodes.Call, m_bar_1);", "il_bar_2.Emit(OpCodes.Ret);",
};
foreach (var expectedLine in expectedLines)
{
Assert.That(cecilifiedCode, Contains.Substring(expectedLine));
}
}
[Test]
public void Test_Issue_133_Span_InitializedByStackallocWithSizeFromField_PassedAsParameter()
{
var result = RunCecilifier(@"using System; class Foo { public static int countField; static void Bar(Span<int> span) { Bar(stackalloc int[countField]); } }");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
var expectedLines = new[]
{
"il_bar_3.Emit(OpCodes.Ldsfld, fld_countField_1);", "il_bar_3.Emit(OpCodes.Conv_U);", "il_bar_3.Emit(OpCodes.Sizeof, assembly.MainModule.TypeSystem.Int32);", "il_bar_3.Emit(OpCodes.Mul_Ovf_Un);",
"il_bar_3.Emit(OpCodes.Localloc);", "il_bar_3.Emit(OpCodes.Ldfld, fld_countField_1);",
"var l_spanCtor_5 = new MethodReference(\".ctor\", assembly.MainModule.TypeSystem.Void, assembly.MainModule.ImportReference(typeof(System.Span<>)).MakeGenericInstanceType(assembly.MainModule.TypeSystem.Int32)) { HasThis = true };",
"l_spanCtor_5.Parameters.Add(new ParameterDefinition(\"ptr\", ParameterAttributes.None, assembly.MainModule.ImportReference(typeof(void*))));",
"l_spanCtor_5.Parameters.Add(new ParameterDefinition(\"length\", ParameterAttributes.None, assembly.MainModule.TypeSystem.Int32));",
"il_bar_3.Emit(OpCodes.Newobj, assembly.MainModule.ImportReference(l_spanCtor_5));", "il_bar_3.Emit(OpCodes.Call, m_bar_2);", "il_bar_3.Emit(OpCodes.Ret);",
};
foreach (var expectedLine in expectedLines)
{
Assert.That(cecilifiedCode, Contains.Substring(expectedLine));
}
}
[Test]
public void Test_Span_InitializedByStackallocWithSizeFromProperty()
{
var result = RunCecilifier("using System; class Foo { public static int CountProperty => 42; static void Bar(Span<int> span) { Bar(stackalloc int[CountProperty]); } }");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Does.Match("""
//Bar\(stackalloc int\[CountProperty\]\);
(?<ilp>\s+il_bar_\d+\.Emit\(OpCodes\.)Call, m_get_2\);
\s+var (?<span_count>l_spanElementCount_\d+) = new VariableDefinition\(assembly.MainModule.TypeSystem.Int32\);
\s+m_bar_\d+.Body\.Variables\.Add\(\k<span_count>\);
\k<ilp>Stloc, \k<span_count>\);
\k<ilp>Ldloc, \k<span_count>\);
"""));
}
[TestCase("paramCount", "Ldarg_0", TestName = "Parameter")]
[TestCase("localCount", @"Ldloc, l_localCount_\d+", TestName = "Local Variable")]
public void Test_Span_InitializedByStackallocWithSizeFromLocalVariableOrParameter(string memberToUse, string storageLoadOpCodeAndArgument)
{
var result = RunCecilifier($"using System; class Foo {{ static void Bar(int paramCount) {{ int localCount = paramCount; Span<int> span = stackalloc int[{memberToUse}]; }} }}");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Does.Match($"""
//Span<int> span = stackalloc int\[{memberToUse}\];
\s+var (?<span_var>l_span_\d+) = new VariableDefinition\(.+ImportReference\(typeof\(System.Span<>\)\).MakeGenericInstanceType\(.+Int32\)\);
\s+m_bar_\d+\.Body.Variables.Add\(\k<span_var>\);
(?<ilp>\s+il_bar_\d+\.Emit\(OpCodes\.){storageLoadOpCodeAndArgument}\);
\k<ilp>Conv_U\);
"""));
}
[Test]
public void ImplicitStackAllocInNestedExpressions()
{
var code = @"using System; class C { void M() => M2(stackalloc [] { 1, 2, 3}); void M2(Span<int> span) {} }";
var result = RunCecilifier(code);
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Does.Match(
@"var (l_spanCtor_\d+) = new MethodReference\("".ctor"", assembly.MainModule.TypeSystem.Void, assembly.MainModule.ImportReference\(typeof\(System\.Span<>\)\).MakeGenericInstanceType\(.+TypeSystem.Int32\)\) { HasThis = true };\s+" +
@"\1.Parameters.Add\(.+""ptr"".+void\*.+\);\s+" +
@"\1.Parameters.Add\(.+""length"".+TypeSystem.Int32.+\);\s+" +
@"il_M_\d+.Emit\(OpCodes.Newobj, assembly.MainModule.ImportReference\(\1\)\);"));
}
[Test]
public void ExplicitStackAllocInNestedExpressions()
{
var code = @"using System; class C { void M() => M2(stackalloc int[42]); void M2(Span<int> span) {} }";
var result = RunCecilifier(code);
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Does.Match(
@"var (l_spanCtor_\d+) = new MethodReference\("".ctor"", assembly.MainModule.TypeSystem.Void, assembly.MainModule.ImportReference\(typeof\(System\.Span<>\)\).MakeGenericInstanceType\(.+TypeSystem.Int32\)\) { HasThis = true };\s+" +
@"\1.Parameters.Add\(.+""ptr"".+void\*.+\);\s+" +
@"\1.Parameters.Add\(.+""length"".+TypeSystem.Int32.+\);\s+" +
@"il_M_\d+.Emit\(OpCodes.Newobj, assembly.MainModule.ImportReference\(\1\)\);"));
}
[TestCase("System.Span<byte>")]
[TestCase("var")]
public void InitializationOptimized(string storageType)
{
var result = RunCecilifier($$"""unsafe class Foo { void M() { {{storageType}} local = stackalloc byte[] { 1, 2, 3 }; } }""");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(cecilifiedCode, Does.Match("""
\s+//<PrivateImplementationDetails> class.
\s+//This type is emitted by the compiler.
\s+var (cls_privateImplementationDetails_\d+) = new TypeDefinition\("", "<PrivateImplementationDetails>", TypeAttributes.NotPublic \| TypeAttributes.Sealed \| TypeAttributes.AnsiClass \| TypeAttributes.AutoLayout, assembly.MainModule.TypeSystem.Object\);
\s+assembly.MainModule.Types.Add\(\1\);
\s+//__StaticArrayInitTypeSize=3 struct.
\s+//This struct is emitted by the compiler and is used to hold raw data used in arrays/span initialization optimizations
\s+var (st_rawDataTypeVar_\d+) = new TypeDefinition\("", "__StaticArrayInitTypeSize=3", TypeAttributes.NestedAssembly \| TypeAttributes.Sealed \| TypeAttributes.AnsiClass \| TypeAttributes.ExplicitLayout.+\) \{ ClassSize = 3,PackingSize = 1 \};
\s+\1.NestedTypes.Add\(\2\);
\s+var (fld_arrayInitializerData_\d+) = new FieldDefinition\("[A-Z0-9]+", FieldAttributes.Assembly \| FieldAttributes.Static \| FieldAttributes.InitOnly, \2\);
\s+\1.Fields.Add\(\3\);
\s+\3.InitialValue = \[ 0x01,0x02,0x03, \];
\s+//duplicates the top of the stack \(the newly `stackalloced` buffer\) and initialize it from the raw buffer \(\3\).
\s+(il_.+).Emit\(OpCodes.Dup\);
\s+\4.Emit\(OpCodes.Ldsflda, \3\);
"""));
}
}