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using System.Linq;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using SharpGen.Logging;
using SharpGen.Model;
using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
namespace SharpGen.Generator;
internal sealed class CallableCodeGenerator : MemberSingleCodeGeneratorBase<CsCallable>
{
public override MemberDeclarationSyntax GenerateCode(CsCallable csElement)
{
// method signature
var parameters = csElement.PublicParameters.Select(
param => GetMarshaller(param)
.GenerateManagedParameter(param)
.WithDefault(
param.DefaultValue == null
? default
: EqualsValueClause(ParseExpression(param.DefaultValue))
)
);
var methodDeclaration = AddDocumentationTrivia(
MethodDeclaration(
ParseTypeName(csElement.PublicReturnTypeQualifiedName),
csElement.Name
)
.WithModifiers(csElement.VisibilityTokenList.Add(Token(SyntaxKind.UnsafeKeyword)))
.WithParameterList(ParameterList(SeparatedList(parameters))),
csElement
);
if (csElement.SignatureOnly)
{
return methodDeclaration
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken))
.WithModifiers(TokenList());
}
if (csElement is CsMethod { NativePartial: true })
{
return methodDeclaration
.AddModifiers(Token(SyntaxKind.PartialKeyword))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken));
}
var statements = NewStatementList;
foreach (var param in csElement.Parameters)
{
var relations = param.Relations;
if (relations.Count != 0 || param.UsedAsReturn)
statements.Add(GenerateManagedHiddenMarshallableProlog(param));
foreach (var relation in relations)
{
if (!ValidRelationInScenario(relation))
{
Logger.Error(
LoggingCodes.InvalidRelationInScenario,
$"The relation \"{relation}\" is invalid in a method/function."
);
continue;
}
CsParameter relatedParameter = null;
if (relation is LengthRelation {Identifier: {Length: >0} relatedMarshallableName})
{
relatedParameter = csElement.Parameters
.SingleOrDefault(
p => p.CppElementName == relatedMarshallableName
);
if (relatedParameter is null)
{
Logger.Error(
LoggingCodes.InvalidRelationInScenario,
$"The relation with \"{relatedMarshallableName}\" parameter is invalid in a method/function \"{csElement.Name}\"."
);
continue;
}
}
statements.Add(
relation,
item => GetRelationMarshaller(item).GenerateManagedToNative(relatedParameter, param)
);
}
statements.AddRange(
param,
static(marshaller, item) => marshaller.GenerateManagedToNativeProlog(item)
);
}
if (csElement.HasReturnType)
{
statements.Add(GenerateManagedHiddenMarshallableProlog(csElement.ReturnValue));
statements.AddRange(
csElement.ReturnValue,
static(marshaller, item) => marshaller.GenerateManagedToNativeProlog(item)
);
}
statements.AddRange(
csElement.InRefInRefParameters,
static (marshaller, item) => marshaller.GenerateManagedToNative(item, true)
);
var fixedStatements = csElement.PublicParameters
.Select(param => GetMarshaller(param).GeneratePin(param))
.Where(stmt => stmt != null).ToList();
StatementSyntax callStmt;
{
var callStmtList = NewStatementList;
callStmtList.Add(csElement, Generators.NativeInvocation);
callStmt = callStmtList.ToStatement();
}
var fixedStatement = fixedStatements.FirstOrDefault()?.WithStatement(callStmt);
foreach (var statement in fixedStatements.Skip(1))
{
fixedStatement = statement.WithStatement(fixedStatement);
}
statements.Add(fixedStatement ?? callStmt);
statements.AddRange(
csElement.LocalManagedReferenceParameters,
static (marshaller, item) => marshaller.GenerateNativeToManaged(item, true)
);
if (csElement.HasReturnType)
statements.Add(
csElement.ReturnValue,
static (marshaller, item) => marshaller.GenerateNativeToManaged(item, true)
);
statements.AddRange(
csElement.InRefInRefParameters,
static (marshaller, item) => marshaller.GenerateNativeCleanup(item, true)
);
if (csElement.IsReturnTypeResult && csElement.CheckReturnType)
{
statements.Add(
InvocationExpression(
MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
IdentifierName(csElement.ReturnValue.Name),
IdentifierName("CheckError")))
);
}
// Return
if (csElement.HasReturnStatement)
{
statements.Add(ReturnStatement(IdentifierName(csElement.ReturnName)));
}
return methodDeclaration.WithBody(statements.ToBlock());
}
private static StatementSyntax GenerateManagedHiddenMarshallableProlog(CsMarshalCallableBase csElement) =>
LocalDeclarationStatement(
VariableDeclaration(
ReverseCallablePrologCodeGenerator.GetPublicType(csElement),
SingletonSeparatedList(VariableDeclarator(csElement.Name))
)
);
private static bool ValidRelationInScenario(MarshallableRelation relation) =>
relation is ConstantValueRelation or LengthRelation;
public CallableCodeGenerator(Ioc ioc) : base(ioc)
{
}
}