1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 // MARKER(update_precomp.py): autogen include statement, do not remove 25 #include "precompiled_bridges.hxx" 26 27 #include "abi.hxx" 28 29 #include <rtl/ustring.hxx> 30 31 using namespace x86_64; 32 33 bool x86_64::return_in_hidden_param( typelib_TypeDescriptionReference *pTypeRef ) 34 { 35 switch ( pTypeRef->eTypeClass ) 36 { 37 case typelib_TypeClass_VOID: 38 return false; 39 case typelib_TypeClass_CHAR: 40 case typelib_TypeClass_BOOLEAN: 41 case typelib_TypeClass_BYTE: 42 case typelib_TypeClass_SHORT: 43 case typelib_TypeClass_UNSIGNED_SHORT: 44 case typelib_TypeClass_LONG: 45 case typelib_TypeClass_UNSIGNED_LONG: 46 case typelib_TypeClass_HYPER: 47 case typelib_TypeClass_UNSIGNED_HYPER: 48 case typelib_TypeClass_ENUM: 49 return false; 50 case typelib_TypeClass_FLOAT: 51 return false; 52 case typelib_TypeClass_DOUBLE: 53 return false; 54 case typelib_TypeClass_STRING: 55 case typelib_TypeClass_TYPE: 56 case typelib_TypeClass_ANY: 57 case typelib_TypeClass_TYPEDEF: 58 case typelib_TypeClass_UNION: 59 case typelib_TypeClass_SEQUENCE: 60 case typelib_TypeClass_ARRAY: 61 case typelib_TypeClass_INTERFACE: 62 return true; 63 case typelib_TypeClass_STRUCT: 64 case typelib_TypeClass_EXCEPTION: 65 /* MSVC returns a class/struct in RAX only when it is a POD of 66 * 1/2/4/8 bytes. Every UNO struct cppumaker emits has 67 * user-declared constructors, which makes it non-trivial, so MSVC 68 * always returns one through a hidden pointer -- regardless of 69 * size. Verified by disassembling cppobj.uno.dll: echoOneByte 70 * (1 byte), echoTwoFloats (8) and echoBigStruct (64) are all 71 * (rcx=this, rdx=hidden return, r8=&arg), writing the result 72 * through [rdx] and returning it in rax. 73 * 74 * Sizing this on nSize > 8 left every <=8-byte struct return one 75 * argument short: the bridge passed (this, &arg) where the callee 76 * expected (this, retptr, &arg), so r8 held garbage and the first 77 * such call -- echoTwoFloats -- took an access violation. */ 78 return true; 79 80 default: 81 #if OSL_DEBUG_LEVEL > 1 82 OSL_TRACE( "Unhandled case: pType->eTypeClass == %d\n", pTypeRef->eTypeClass ); 83 #endif 84 OSL_ASSERT(0); 85 } 86 return 0; /* Never reached. */ 87 } 88