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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org Code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// Platform specific code to invoke XPCOM methods on native objects
#include "xptcprivate.h"
// 6 integral parameters are passed in registers
const PRUint32 GPR_COUNT = 6;
// 8 floating point parameters are passed in SSE registers
const PRUint32 FPR_COUNT = 8;
// Remember that these 'words' are 64-bit long
static inline void
invoke_count_words(PRUint32 paramCount, nsXPTCVariant * s,
PRUint32 & nr_gpr, PRUint32 & nr_fpr, PRUint32 & nr_stack)
{
nr_gpr = 1; // skip one GP register for 'that'
nr_fpr = 0;
nr_stack = 0;
/* Compute number of eightbytes of class MEMORY. */
for (uint32 i = 0; i < paramCount; i++, s++) {
if (!s->IsPtrData()
&& (s->type == nsXPTType::T_FLOAT || s->type == nsXPTType::T_DOUBLE)) {
if (nr_fpr < FPR_COUNT)
nr_fpr++;
else
nr_stack++;
}
else {
if (nr_gpr < GPR_COUNT)
nr_gpr++;
else
nr_stack++;
}
}
}
static void
invoke_copy_to_stack(PRUint64 * d, PRUint32 paramCount, nsXPTCVariant * s,
PRUint64 * gpregs, double * fpregs)
{
PRUint32 nr_gpr = 1; // skip one GP register for 'that'
PRUint32 nr_fpr = 0;
PRUint64 value;
for (uint32 i = 0; i < paramCount; i++, s++) {
if (s->IsPtrData())
value = (PRUint64) s->ptr;
else {
switch (s->type) {
case nsXPTType::T_FLOAT: break;
case nsXPTType::T_DOUBLE: break;
case nsXPTType::T_I8: value = s->val.i8; break;
case nsXPTType::T_I16: value = s->val.i16; break;
case nsXPTType::T_I32: value = s->val.i32; break;
case nsXPTType::T_I64: value = s->val.i64; break;
case nsXPTType::T_U8: value = s->val.u8; break;
case nsXPTType::T_U16: value = s->val.u16; break;
case nsXPTType::T_U32: value = s->val.u32; break;
case nsXPTType::T_U64: value = s->val.u64; break;
case nsXPTType::T_BOOL: value = s->val.b; break;
case nsXPTType::T_CHAR: value = s->val.c; break;
case nsXPTType::T_WCHAR: value = s->val.wc; break;
default: value = (PRUint64) s->val.p; break;
}
}
if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
if (nr_fpr < FPR_COUNT)
fpregs[nr_fpr++] = s->val.d;
else {
*((double *)d) = s->val.d;
d++;
}
}
else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
if (nr_fpr < FPR_COUNT)
// The value in %xmm register is already prepared to
// be retrieved as a float. Therefore, we pass the
// value verbatim, as a double without conversion.
fpregs[nr_fpr++] = s->val.d;
else {
*((float *)d) = s->val.f;
d++;
}
}
else {
if (nr_gpr < GPR_COUNT)
gpregs[nr_gpr++] = value;
else
*d++ = value;
}
}
}
extern "C"
XPTC_PUBLIC_API(nsresult)
XPTC_InvokeByIndex(nsISupports * that, PRUint32 methodIndex,
PRUint32 paramCount, nsXPTCVariant * params)
{
PRUint32 nr_gpr, nr_fpr, nr_stack;
invoke_count_words(paramCount, params, nr_gpr, nr_fpr, nr_stack);
// Stack, if used, must be 16-bytes aligned
if (nr_stack)
nr_stack = (nr_stack + 1) & ~1;
// Load parameters to stack, if necessary
PRUint64 *stack = (PRUint64 *) __builtin_alloca(nr_stack * 8);
PRUint64 gpregs[GPR_COUNT];
double fpregs[FPR_COUNT];
invoke_copy_to_stack(stack, paramCount, params, gpregs, fpregs);
// Load FPR registers from fpregs[]
register double d0 asm("xmm0");
register double d1 asm("xmm1");
register double d2 asm("xmm2");
register double d3 asm("xmm3");
register double d4 asm("xmm4");
register double d5 asm("xmm5");
register double d6 asm("xmm6");
register double d7 asm("xmm7");
switch (nr_fpr) {
#define ARG_FPR(N) \
case N+1: d##N = fpregs[N];
ARG_FPR(7);
ARG_FPR(6);
ARG_FPR(5);
ARG_FPR(4);
ARG_FPR(3);
ARG_FPR(2);
ARG_FPR(1);
ARG_FPR(0);
case 0:;
#undef ARG_FPR
}
// Load GPR registers from gpregs[]
register PRUint64 a0 asm("rdi");
register PRUint64 a1 asm("rsi");
register PRUint64 a2 asm("rdx");
register PRUint64 a3 asm("rcx");
register PRUint64 a4 asm("r8");
register PRUint64 a5 asm("r9");
switch (nr_gpr) {
#define ARG_GPR(N) \
case N+1: a##N = gpregs[N];
ARG_GPR(5);
ARG_GPR(4);
ARG_GPR(3);
ARG_GPR(2);
ARG_GPR(1);
case 1: a0 = (PRUint64) that;
case 0:;
#undef ARG_GPR
}
// Ensure that assignments to SSE registers won't be optimized away
asm("" ::
"x" (d0), "x" (d1), "x" (d2), "x" (d3),
"x" (d4), "x" (d5), "x" (d6), "x" (d7));
// Get pointer to method
PRUint64 methodAddress = *((PRUint64 *)that);
methodAddress += 8 * methodIndex;
methodAddress = *((PRUint64 *)methodAddress);
typedef PRUint32 (*Method)(PRUint64, PRUint64, PRUint64, PRUint64, PRUint64, PRUint64);
PRUint32 result = ((Method)methodAddress)(a0, a1, a2, a3, a4, a5);
return result;
}
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