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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/config.h>
#include <cstring>
#include <cppu/macros.hxx>
#include <sal/types.h>
#include <typelib/typeclass.h>
#include <typelib/typedescription.h>
#include "abi.hxx"
#include "callvirtualmethod.hxx"
// The call instruction within the asm block of callVirtualMethod may throw
// exceptions. At least GCC 4.7.0 with -O0 would create (unnecessary)
// .gcc_exception_table call-site table entries around all other calls in this
// function that can throw, leading to std::terminate if the asm call throws an
// exception and the unwinding C++ personality routine finds the unexpected hole
// in the .gcc_exception_table. Therefore, make sure this function explicitly
// only calls nothrow-functions (so GCC 4.7.0 with -O0 happens to not create a
// .gcc_exception_table section at all for this function). For some reason,
// this also needs to be in a source file of its own.
//
// Also, this file should be compiled with -fnon-call-exceptions, and ideally
// there would be a way to tell the compiler that the asm block contains calls
// to functions that can potentially throw; see the mail thread starting at
// <http://gcc.gnu.org/ml/gcc/2012-03/msg00454.html> "C++: Letting compiler know
// asm block can call function that can throw?"
void CPPU_CURRENT_NAMESPACE::callVirtualMethod(
void * pThis, sal_uInt32 nVtableIndex, void * pRegisterReturn,
typelib_TypeDescriptionReference * pReturnTypeRef, bool bSimpleReturn,
sal_uInt64 *pStack, sal_uInt32 nStack, sal_uInt64 *pGPR, double * pFPR)
{
// Work around Clang -fsanitize=address "inline assembly requires more
// registers than available" error:
struct Data {
sal_uInt64 pMethod;
sal_uInt64 * pStack;
sal_uInt32 nStack;
sal_uInt64 * pGPR;
double * pFPR;
// Return values:
sal_uInt64 rax;
sal_uInt64 rdx;
double xmm0;
double xmm1;
} data;
data.pStack = pStack;
data.nStack = nStack;
data.pGPR = pGPR;
data.pFPR = pFPR;
// Get pointer to method
sal_uInt64 pMethod = *static_cast<sal_uInt64 *>(pThis);
pMethod += 8 * nVtableIndex;
data.pMethod = *reinterpret_cast<sal_uInt64 *>(pMethod);
asm volatile (
// Push arguments to stack
"movq %%rsp, %%r12\n\t"
"movl 16%0, %%ecx\n\t"
"jrcxz .Lpushed\n\t"
"xor %%rax, %%rax\n\t"
"leaq (%%rax, %%rcx, 8), %%rax\n\t"
"subq %%rax, %%rsp\n\t"
"andq $-9, %%rsp\n\t" // 16-bytes aligned
"movq 8%0, %%rsi\n\t"
"\n.Lpush:\n\t"
"decq %%rcx\n\t"
"movq (%%rsi, %%rcx, 8), %%rax\n\t"
"movq %%rax, (%%rsp, %%rcx, 8)\n\t"
"jnz .Lpush\n\t"
"\n.Lpushed:\n\t"
// Fill the xmm registers
"movq 32%0, %%rax\n\t"
"movsd (%%rax), %%xmm0\n\t"
"movsd 8(%%rax), %%xmm1\n\t"
"movsd 16(%%rax), %%xmm2\n\t"
"movsd 24(%%rax), %%xmm3\n\t"
"movsd 32(%%rax), %%xmm4\n\t"
"movsd 40(%%rax), %%xmm5\n\t"
"movsd 48(%%rax), %%xmm6\n\t"
"movsd 56(%%rax), %%xmm7\n\t"
// Fill the general purpose registers
"movq 24%0, %%rax\n\t"
"movq (%%rax), %%rdi\n\t"
"movq 8(%%rax), %%rsi\n\t"
"movq 16(%%rax), %%rdx\n\t"
"movq 24(%%rax), %%rcx\n\t"
"movq 32(%%rax), %%r8\n\t"
"movq 40(%%rax), %%r9\n\t"
// Perform the call
"movq 0%0, %%r11\n\t"
"call *%%r11\n\t"
// Fill the return values
"movq %%rax, 40%0\n\t"
"movq %%rdx, 48%0\n\t"
"movsd %%xmm0, 56%0\n\t"
"movsd %%xmm1, 64%0\n\t"
// Reset %rsp
"movq %%r12, %%rsp\n\t"
:: "o" (data)
: "rax", "rdi", "rsi", "rdx", "rcx", "r8", "r9", "r10", "r11", "r12",
"xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7",
"xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15",
"memory"
);
switch (pReturnTypeRef->eTypeClass)
{
case typelib_TypeClass_HYPER:
case typelib_TypeClass_UNSIGNED_HYPER:
*static_cast<sal_uInt64 *>( pRegisterReturn ) = data.rax;
break;
case typelib_TypeClass_LONG:
case typelib_TypeClass_UNSIGNED_LONG:
case typelib_TypeClass_ENUM:
*static_cast<sal_uInt32 *>( pRegisterReturn ) = *reinterpret_cast<sal_uInt32*>( &data.rax );
break;
case typelib_TypeClass_CHAR:
case typelib_TypeClass_SHORT:
case typelib_TypeClass_UNSIGNED_SHORT:
*static_cast<sal_uInt16 *>( pRegisterReturn ) = *reinterpret_cast<sal_uInt16*>( &data.rax );
break;
case typelib_TypeClass_BOOLEAN:
case typelib_TypeClass_BYTE:
*static_cast<sal_uInt8 *>( pRegisterReturn ) = *reinterpret_cast<sal_uInt8*>( &data.rax );
break;
case typelib_TypeClass_FLOAT:
case typelib_TypeClass_DOUBLE:
*static_cast<double *>( pRegisterReturn ) = data.xmm0;
break;
default:
{
sal_Int32 const nRetSize = pReturnTypeRef->pType->nSize;
if (bSimpleReturn && nRetSize <= 16 && nRetSize > 0)
{
sal_uInt64 longs[2];
longs[0] = data.rax;
longs[1] = data.rdx;
double doubles[2];
doubles[0] = data.xmm0;
doubles[1] = data.xmm1;
x86_64::fill_struct( pReturnTypeRef, &longs[0], &doubles[0], pRegisterReturn);
}
break;
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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