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ArrayTests.cs
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using Cecilifier.Core.Tests.Tests.Unit.Framework;
using Mono.Cecil.Cil;
using NUnit.Framework;
namespace Cecilifier.Core.Tests.Tests.Unit;
[TestFixture]
public class ArrayTests : CecilifierUnitTestBase
{
[TestCase("string", Code.Ldelem_Ref)]
[TestCase("C", Code.Ldelem_Ref)]
[TestCase("S", Code.Ldelem_Any, ", st_S_\\d+")]
[TestCase("byte", Code.Ldelem_I1)]
[TestCase("char", Code.Ldelem_I2)]
[TestCase("short", Code.Ldelem_I2)]
[TestCase("int", Code.Ldelem_I4)]
[TestCase("long", Code.Ldelem_I8)]
[TestCase("float", Code.Ldelem_R4)]
[TestCase("double", Code.Ldelem_R8)]
[TestCase("System.DateTime", Code.Ldelem_Any, @", .+ImportReference\(typeof\(System.DateTime\)\)")]
public void TestAccessStringArray(string elementType, Code code, string operand = "")
{
var result = RunCecilifier($@"struct S {{}} class C {{ {elementType} M({elementType} []a) => a[2]; }}");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(
cecilifiedCode,
Does.Match(
$"""
(.+\.Emit\(OpCodes\.)Ldarg_1\);
\1Ldc_I4, 2\);
\1{code}{operand}\);
"""));
}
[TestCase("string", Code.Stelem_Ref)]
[TestCase("C", Code.Stelem_Ref)]
[TestCase("byte", Code.Stelem_I1)]
[TestCase("char", Code.Stelem_I2)]
[TestCase("short", Code.Stelem_I2)]
[TestCase("int", Code.Stelem_I4)]
[TestCase("long", Code.Stelem_I8)]
[TestCase("float", Code.Stelem_R4)]
[TestCase("double", Code.Stelem_R8)]
[TestCase("System.DateTime", Code.Stelem_Any, @", .+ImportReference\(typeof\(System.DateTime\)\)")]
[TestCase("S", Code.Stelem_Any, @", st_S_\d+")]
public void TestArrayInstantiation(string elementType, Code code, string operand = "")
{
var result = RunCecilifier($@"struct S {{}} class C {{ void M({elementType} value) {{ var data = new[] {{ value }}; }} }}");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(
cecilifiedCode,
Does.Match(
$"""
(.+\.Emit\(OpCodes\.)Dup\);
\1Ldc_I4, 0\);
\1Ldarg_1.+
\1{code}{operand}\);\s+
"""));
}
[TestCase("System.String")]
[TestCase("C", @"cls_C_\d+")]
[TestCase("System.Byte")]
[TestCase("System.Char")]
[TestCase("System.Int16")]
[TestCase("System.Int32")]
[TestCase("System.Int64")]
[TestCase("System.Single")]
[TestCase("System.Double")]
[TestCase("System.DateTime", @".+ImportReference\(typeof\(System.DateTime\)\)")]
[TestCase("S", @"st_S_\d+")]
public void TestJaggedArrayInstantiation(string elementType, string operand = null)
{
var result = RunCecilifier($@"struct S {{}} class C {{ void M({elementType} value) {{ var data = new {elementType}[42][]; }} }}");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
var operandTypeMatch = operand ?? $"assembly.MainModule.Type{elementType}";
Assert.That(cecilifiedCode, Does.Match($@"new VariableDefinition\({operandTypeMatch}.MakeArrayType\(\).MakeArrayType\(\)\);\s+"));
Assert.That(
cecilifiedCode,
Does.Match(
$"""
(.+\.Emit\(OpCodes\.)Ldc_I4, 42\);
\1Newarr, {operandTypeMatch}.MakeArrayType\(\)\);\s+
"""));
}
[TestCase("string", Code.Stelem_Ref)]
[TestCase("C", Code.Stelem_Ref)]
[TestCase("byte", Code.Stelem_I1)]
[TestCase("char", Code.Stelem_I2)]
[TestCase("short", Code.Stelem_I2)]
[TestCase("int", Code.Stelem_I4)]
[TestCase("long", Code.Stelem_I8)]
[TestCase("float", Code.Stelem_R4)]
[TestCase("double", Code.Stelem_R8)]
[TestCase("System.DateTime", Code.Stelem_Any, @", .+ImportReference\(typeof\(System.DateTime\)\)")]
[TestCase("S", Code.Stelem_Any, @", st_S_\d+")]
public void TestJaggedArrayAssignment(string elementType, Code code, string operand = "")
{
var result = RunCecilifier($@"struct S {{}} class C {{ void M({elementType} [][]array, {elementType} value) {{ array[0][1] = value; }} }}");
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(
cecilifiedCode,
Does.Match(
$"""
//array\[0\]\[1\] = value;
(.+Emit\(OpCodes\.)Ldarg_1\);
\1Ldc_I4, 0.+
\1Ldelem_Ref.+
\1Ldc_I4, 1.+
\1Ldarg_2.+
\1{code}{operand}.+;
"""));
}
[TestCase("class Foo { void M() { int []intArray = { 1 }; } }", TestName = "Local Variable")]
[TestCase("class Foo { int []intArray = { 1 }; }", TestName = "Field")]
public void ImplicitArrayInitializationUnoptimized(string code)
{
// See comment in TestImplicitArrayInitializationOptimized
var result = RunCecilifier(code);
var cecilifiedCode = result.GeneratedCode.ReadToEnd();
Assert.That(
cecilifiedCode,
Does.Match(
"""
((?:.+)\.Emit\(OpCodes\.)Ldc_I4, 1\);
\1Newarr, assembly.MainModule.TypeSystem.Int32\);
\1Dup\);
\1Ldc_I4, 0\);
\1Ldc_I4, 1\);
\1Stelem_I4\);
\1(Stfld|Stloc), .+_intArray_\d+\);
"""));
}
[TestCase("class Foo { void M() { int []intArray = new [] { 1, 2, 3 }; } }", TestName = "Local Variable")]
[TestCase("class Foo { int []intArray = new [] { 1, 2, 3 }; }", TestName = "Field")]
public void InitializationOptimized(string code)
{
var result = RunCecilifier(code);
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=12 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\("", "__StaticArrayInitTypeSize=12", TypeAttributes.NestedAssembly \| TypeAttributes.Sealed \| TypeAttributes.AnsiClass \| TypeAttributes.ExplicitLayout.+\) \{ ClassSize = 12,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 = \[ 0x01,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x03,0x00,0x00,0x00, \];
\s+(il_.+).Emit\(OpCodes.Dup\);
\s+\4.Emit\(OpCodes.Ldtoken, \3\);
"""));
}
[TestCase("Property", "Call, m_get_2", TestName = "Property")]
[TestCase("Method()", @"Call, m_method_\d+", TestName = "Method")]
[TestCase("Field", @"Ldfld, fld_field_\d+", TestName = "Field")]
public void MemberAccessOnElementAccessOnValueTypeArray_LoadsElementAddress(string member, string expectedILMemberRef)
{
var result = RunCecilifier($$"""int M(S[] sa) => sa[0].{{member}}; struct S { public int Property { get; set; } public int Field; public int Method() => 1; }""");
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match($"""
(il_M_\d+\.Emit\(OpCodes\.)Ldarg_0\);
\s+\1Ldc_I4, 0\);
\s+\1Ldelema, st_S_0\);
\s+\1{expectedILMemberRef}\);
\s+\1Ret\);
"""));
}
[TestCase("Property", "Callvirt, m_get_2", TestName = "Property")]
[TestCase("Method()", @"Callvirt, m_method_\d+", TestName = "Method")]
[TestCase("Field", @"Ldfld, fld_field_\d+", TestName = "Field")]
public void MemberAccessOnElementAccessOnReferenceTypeArray_LoadsElementByReference(string member, string expectedILMemberRef)
{
var result = RunCecilifier($$"""int M(S[] sa) => sa[0].{{member}}; class S { public int Property { get; set; } public int Field; public int Method() => 1; }""");
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match($"""
(il_M_\d+\.Emit\(OpCodes\.)Ldarg_0\);
\s+\1Ldc_I4, 0\);
\s+\1Ldelem_Ref\);
\s+\1{expectedILMemberRef}\);
\s+\1Ret\);
"""));
}
}