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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// File: StringNative.cpp
//
//
// Purpose: The implementation of the String class.
//
//
#include "common.h"
#include "object.h"
#include "utilcode.h"
#include "excep.h"
#include "frames.h"
#include "field.h"
#include "vars.hpp"
#include "stringnative.h"
#include "stringbuffer.h"
#include "comutilnative.h"
#include "metasig.h"
#include "excep.h"
// Compile the string functionality with these pragma flags (equivalent of the command line /Ox flag)
// Compiling this functionality differently gives us significant throughout gain in some cases.
#if defined(_MSC_VER) && defined(_TARGET_X86_)
#pragma optimize("tgy", on)
#endif
/*===============================IsFastSort===============================
**Action: Call the helper to walk the string and see if we have any high chars.
**Returns: void. The appropriate bits are set on the String.
**Arguments: vThisRef - The string to be checked.
**Exceptions: None.
==============================================================================*/
FCIMPL1(FC_BOOL_RET, COMString::IsFastSort, StringObject* thisRef) {
FCALL_CONTRACT;
VALIDATEOBJECT(thisRef);
_ASSERTE(thisRef!=NULL);
DWORD state = thisRef->GetHighCharState();
if (IS_STRING_STATE_UNDETERMINED(state)) {
state = (STRINGREF(thisRef))->InternalCheckHighChars();
FC_GC_POLL_RET();
}
else {
FC_GC_POLL_NOT_NEEDED();
}
FC_RETURN_BOOL(IS_FAST_SORT(state)); //This can indicate either high chars or special sorting chars.
}
FCIMPLEND
/*===============================IsAscii===============================
**Action: Call the helper to walk the string and see if we have any high chars.
**Returns: void. The appropriate bits are set on the String.
**Arguments: vThisRef - The string to be checked.
**Exceptions: None.
==============================================================================*/
FCIMPL1(FC_BOOL_RET, COMString::IsAscii, StringObject* thisRef) {
FCALL_CONTRACT;
VALIDATEOBJECT(thisRef);
_ASSERTE(thisRef!=NULL);
DWORD state = thisRef->GetHighCharState();
if (IS_STRING_STATE_UNDETERMINED(state)) {
state = (STRINGREF(thisRef))->InternalCheckHighChars();
FC_GC_POLL_RET();
}
else {
FC_GC_POLL_NOT_NEEDED();
}
FC_RETURN_BOOL(IS_ASCII(state)); //This can indicate either high chars or special sorting chars.
}
FCIMPLEND
//This function relies on the fact that we put a terminating null on the end of
//all managed strings.
FCIMPL2(INT32, COMString::FCCompareOrdinalIgnoreCaseWC, StringObject* strA, __in_z INT8 *strBChars) {
FCALL_CONTRACT;
VALIDATEOBJECT(strA);
WCHAR *strAChars;
WCHAR *strAStart;
INT32 aLength;
INT32 ret;
_ASSERT(strA != NULL && strBChars != NULL);
//Get our data.
strA->RefInterpretGetStringValuesDangerousForGC((WCHAR **) &strAChars, &aLength);
//Record the start pointer for some comparisons at the end.
strAStart = strAChars;
if (!StringObject::CaseInsensitiveCompHelper(strAChars, strBChars, aLength, -1, &ret)) {
//This will happen if we have characters greater than 0x7F. This indicates that the function failed.
// We don't throw an exception here. You can look at the success value returned to do something meaningful.
ret = 1;
}
FC_GC_POLL_RET();
return ret;
}
FCIMPLEND
/*==================================GETCHARAT===================================
**Returns the character at position index. Thows IndexOutOfRangeException as
**appropriate.
**This method is not actually used. JIT will generate code for indexer method on string class.
**
==============================================================================*/
FCIMPL2(FC_CHAR_RET, COMString::GetCharAt, StringObject* str, INT32 index) {
FCALL_CONTRACT;
FC_GC_POLL_NOT_NEEDED();
VALIDATEOBJECT(str);
if (str == NULL) {
FCThrow(kNullReferenceException);
}
_ASSERTE(str->GetMethodTable() == g_pStringClass);
if (index >=0 && index < (INT32)str->GetStringLength()) {
//Return the appropriate character.
return str->GetBuffer()[index];
}
FCThrow(kIndexOutOfRangeException);
}
FCIMPLEND
/*==================================LENGTH=================================== */
FCIMPL1(INT32, COMString::Length, StringObject* str) {
FCALL_CONTRACT;
FC_GC_POLL_NOT_NEEDED();
if (str == NULL)
FCThrow(kNullReferenceException);
FCUnique(0x11);
return str->GetStringLength();
}
FCIMPLEND
#ifdef FEATURE_COMINTEROP
FCIMPL2(FC_BOOL_RET, COMString::FCTryGetTrailByte, StringObject* thisRefUNSAFE, UINT8 *pbData)
{
FCALL_CONTRACT;
STRINGREF thisRef = ObjectToSTRINGREF(thisRefUNSAFE);
FC_RETURN_BOOL(thisRef->GetTrailByte(pbData));
}
FCIMPLEND
FCIMPL2(VOID, COMString::FCSetTrailByte, StringObject* thisRefUNSAFE, UINT8 bData)
{
FCALL_CONTRACT;
STRINGREF thisRef = ObjectToSTRINGREF(thisRefUNSAFE);
HELPER_METHOD_FRAME_BEGIN_1(thisRef);
thisRef->SetTrailByte(bData);
HELPER_METHOD_FRAME_END();
}
FCIMPLEND
#endif // FEATURE_COMINTEROP
// Revert to command line compilation flags
#if defined(_MSC_VER) && defined(_TARGET_X86_)
#pragma optimize ("", on)
#endif
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