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C#: Extractor support for UTF-8 encoded strings.

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This commit is contained in:
Michael Nebel
2023-01-19 12:22:36 +01:00
parent 72fa3bd905
commit e8eedb7b4d
6 changed files with 26 additions and 5 deletions
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17
csharp/extractor/Semmle.Extraction.CSharp/Entities/ExpressionNodeInfo.cs
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@@ -2,7 +2,6 @@ using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Semmle.Extraction.CSharp.Populators;
using Semmle.Extraction.Entities;
using Semmle.Extraction.Kinds;
namespace Semmle.Extraction.CSharp.Entities
@@ -107,6 +106,11 @@ namespace Semmle.Extraction.CSharp.Entities
return Expression.ValueAsString(val);
}
if (TryGetStringValueFromUtf8Literal(out var s))
{
return s;
}
return null;
}
}
@@ -181,6 +185,17 @@ namespace Semmle.Extraction.CSharp.Entities
return isTrue || isFalse;
}
private bool TryGetStringValueFromUtf8Literal(out string? value)
{
value = null;
if (Node.IsKind(SyntaxKind.Utf8StringLiteralExpression) && Node is LiteralExpressionSyntax literal)
{
value = literal.Token.ValueText;
return true;
}
return false;
}
public bool IsBoolLiteral()
{
return TryGetBoolValueFromLiteral(out var _);

1
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Factory.cs
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@@ -47,6 +47,7 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
case SyntaxKind.FalseLiteralExpression:
case SyntaxKind.TrueLiteralExpression:
case SyntaxKind.StringLiteralExpression:
case SyntaxKind.Utf8StringLiteralExpression:
case SyntaxKind.NullLiteralExpression:
case SyntaxKind.NumericLiteralExpression:
case SyntaxKind.CharacterLiteralExpression:

2
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/InterpolatedString.cs
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@@ -27,7 +27,7 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
case SyntaxKind.InterpolatedStringText:
// Create a string literal
var interpolatedText = (InterpolatedStringTextSyntax)c;
new Expression(new ExpressionInfo(Context, Type, Context.CreateLocation(c.GetLocation()), ExprKind.STRING_LITERAL, this, child++, false, interpolatedText.TextToken.ValueText));
new Expression(new ExpressionInfo(Context, Type, Context.CreateLocation(c.GetLocation()), ExprKind.UTF16_STRING_LITERAL, this, child++, false, interpolatedText.TextToken.ValueText));
break;
default:
throw new InternalError(c, $"Unhandled interpolation kind {c.Kind()}");

4
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Literal.cs
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@@ -20,6 +20,8 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
{
case SyntaxKind.DefaultLiteralExpression:
return ExprKind.DEFAULT;
case SyntaxKind.Utf8StringLiteralExpression:
return ExprKind.UTF8_STRING_LITERAL;
case SyntaxKind.NullLiteralExpression:
info.SetType(null); // Don't use converted type.
return ExprKind.NULL_LITERAL;
@@ -63,7 +65,7 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
return ExprKind.FLOAT_LITERAL;
case SpecialType.System_String:
return ExprKind.STRING_LITERAL;
return ExprKind.UTF16_STRING_LITERAL;
case SpecialType.System_UInt16:
case SpecialType.System_UInt32:

3
csharp/extractor/Semmle.Extraction.CSharp/Kinds/ExprKind.cs
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@@ -15,7 +15,7 @@ namespace Semmle.Extraction.Kinds
ULONG_LITERAL = 7,
FLOAT_LITERAL = 8,
DOUBLE_LITERAL = 9,
STRING_LITERAL = 10,
UTF16_STRING_LITERAL = 10,
NULL_LITERAL = 11,
THIS_ACCESS = 12,
BASE_ACCESS = 13,
@@ -129,6 +129,7 @@ namespace Semmle.Extraction.Kinds
SLICE_PATTERN = 132,
URSHIFT = 133,
ASSIGN_URSHIFT = 134,
UTF8_STRING_LITERAL = 135,
DEFINE_SYMBOL = 999,
}
}