private static void EmitStringReturnMarshalling(ILGenerator ilGenerator, IMethodReference ptrToStringAnsi, IMethodReference ptrToStringUnicode, StringFormatKind charSet, IMarshallingInformation returnTypeInfo)
{
bool doUnicodeMarshalling = false;
if (returnTypeInfo != null && returnTypeInfo.UnmanagedType == UnmanagedType.LPWStr)
{
doUnicodeMarshalling = true;
}
else if (charSet == StringFormatKind.Unicode)
{
if (returnTypeInfo == null || (returnTypeInfo.UnmanagedType != UnmanagedType.LPStr &&
returnTypeInfo.UnmanagedType != UnmanagedType.LPTStr))
{
doUnicodeMarshalling = true;
}
}
ilGenerator.Emit(OperationCode.Call, doUnicodeMarshalling ? ptrToStringUnicode : ptrToStringAnsi);
}
internal PlatformInvokeInformation(ITypeDeclarationMember declaringMember, SourceCustomAttribute dllImportAttribute)
{
this.importModule = Dummy.ModuleReference;
this.importName = declaringMember.Name.Name;
this.noMangle = false;
this.pinvokeCallingConvention = PInvokeCallingConvention.WinApi;
this.stringFormat = StringFormatKind.Unspecified;
this.useBestFit = null;
this.throwExceptionForUnmappableChar = null;
INameTable nameTable = dllImportAttribute.ContainingBlock.NameTable;
int bestFitMappingKey = nameTable.GetNameFor("BestFitMapping").UniqueKey;
int callingConventionKey = nameTable.GetNameFor("CallingConvention").UniqueKey;
int charSetKey = nameTable.GetNameFor("CharSet").UniqueKey;
int entryPointKey = nameTable.GetNameFor("EntryPoint").UniqueKey;
int exactSpellingKey = nameTable.GetNameFor("ExactSpelling").UniqueKey;
int setLastErrorKey = nameTable.GetNameFor("SetLastError").UniqueKey;
int throwOnUnmappableCharKey = nameTable.GetNameFor("ThrowOnUnmappableChar").UniqueKey;
foreach (Expression expr in dllImportAttribute.Arguments) {
CompileTimeConstant cc = expr as CompileTimeConstant;
if (cc != null && cc.Value is string) {
IName moduleName = expr.NameTable.GetNameFor((string)cc.Value);
this.importModule = new Immutable.ModuleReference(dllImportAttribute.ContainingBlock.Compilation.HostEnvironment, new ModuleIdentity(moduleName, string.Empty));
continue;
}
NamedArgument narg = expr as NamedArgument;
if (narg == null) continue;
int key = narg.ArgumentName.Name.UniqueKey;
if (key == bestFitMappingKey) {
if (narg.ArgumentValue.Value is bool)
this.useBestFit = (bool)narg.ArgumentValue.Value;
continue;
}
if (key == callingConventionKey) {
if (narg.ArgumentValue.Value is int) {
switch ((CallingConvention)(int)narg.ArgumentValue.Value) {
case CallingConvention.C: this.pinvokeCallingConvention = PInvokeCallingConvention.CDecl; break;
case CallingConvention.Standard: this.pinvokeCallingConvention = PInvokeCallingConvention.StdCall; break;
case CallingConvention.ExplicitThis: this.pinvokeCallingConvention = PInvokeCallingConvention.ThisCall; break;
case CallingConvention.FastCall: this.pinvokeCallingConvention = PInvokeCallingConvention.FastCall; break;
}
}
continue;
}
if (key == charSetKey) {
if (narg.ArgumentValue.Value is int) {
switch ((CharSet)(int)narg.ArgumentValue.Value) {
case CharSet.Ansi: this.stringFormat = StringFormatKind.Ansi; break;
case CharSet.Auto: this.stringFormat = StringFormatKind.AutoChar; break;
case CharSet.Unicode: this.stringFormat = StringFormatKind.Unicode; break;
}
}
continue;
}
if (key == entryPointKey) {
string/*?*/ importName = narg.ArgumentValue.Value as string;
if (importName != null) {
this.importName = nameTable.GetNameFor(importName);
}
continue;
}
if (key == exactSpellingKey) {
if (narg.ArgumentValue.Value is bool)
this.noMangle = (bool)narg.ArgumentValue.Value;
continue;
}
if (key == setLastErrorKey) {
if (narg.ArgumentValue.Value is bool)
this.supportsLastError = (bool)narg.ArgumentValue.Value;
continue;
}
if (key == throwOnUnmappableCharKey) {
if (narg.ArgumentValue.Value is bool)
this.throwExceptionForUnmappableChar = (bool)narg.ArgumentValue.Value;
continue;
}
}
}