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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
// Platform specific code to invoke XPCOM methods on native objects
// The purpose of XPTC_InvokeByIndex() is to map a platform
// indepenpent call to the platform ABI. To do that,
// XPTC_InvokeByIndex() has to determine the method to call via vtable
// access. The parameters for the method are read from the
// nsXPTCVariant* and prepared for the native ABI. For the Linux/PPC
// ABI this means that the first 8 integral and floating point
// parameters are passed in registers.
#include "xptcprivate.h"
// 8 integral parameters are passed in registers
#define GPR_COUNT 8
// 8 floating point parameters are passed in registers, floats are
// promoted to doubles when passed in registers
#define FPR_COUNT 8
extern "C" uint32_t
invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
{
return uint32_t(((paramCount * 2) + 3) & ~3);
}
extern "C" void
invoke_copy_to_stack(uint32_t* d,
uint32_t paramCount,
nsXPTCVariant* s,
uint32_t* gpregs,
double* fpregs)
{
uint32_t gpr = 1; // skip one GP reg for 'that'
uint32_t fpr = 0;
uint32_t tempu32;
uint64_t tempu64;
for(uint32_t i = 0; i < paramCount; i++, s++) {
if(s->IsPtrData()) {
if(s->type == nsXPTType::T_JSVAL)
tempu32 = (uint32_t) &(s->ptr);
else
tempu32 = (uint32_t) s->ptr;
} else {
switch(s->type) {
case nsXPTType::T_FLOAT: break;
case nsXPTType::T_DOUBLE: break;
case nsXPTType::T_I8: tempu32 = s->val.i8; break;
case nsXPTType::T_I16: tempu32 = s->val.i16; break;
case nsXPTType::T_I32: tempu32 = s->val.i32; break;
case nsXPTType::T_I64: tempu64 = s->val.i64; break;
case nsXPTType::T_U8: tempu32 = s->val.u8; break;
case nsXPTType::T_U16: tempu32 = s->val.u16; break;
case nsXPTType::T_U32: tempu32 = s->val.u32; break;
case nsXPTType::T_U64: tempu64 = s->val.u64; break;
case nsXPTType::T_BOOL: tempu32 = s->val.b; break;
case nsXPTType::T_CHAR: tempu32 = s->val.c; break;
case nsXPTType::T_WCHAR: tempu32 = s->val.wc; break;
default: tempu32 = (uint32_t) s->val.p; break;
}
}
if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
if (fpr < FPR_COUNT)
fpregs[fpr++] = s->val.d;
else {
if ((uint32_t) d & 4) d++; // doubles are 8-byte aligned on stack
*((double*) d) = s->val.d;
d += 2;
if (gpr < GPR_COUNT)
gpr += 2;
}
}
else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
if (fpr < FPR_COUNT)
fpregs[fpr++] = s->val.f; // if passed in registers, floats are promoted to doubles
else {
*((float*) d) = s->val.f;
d += 1;
if (gpr < GPR_COUNT)
gpr += 1;
}
}
else if (!s->IsPtrData() && (s->type == nsXPTType::T_I64
|| s->type == nsXPTType::T_U64)) {
if ((gpr + 1) < GPR_COUNT) {
if (gpr & 1) gpr++; // longlongs are aligned in odd/even register pairs, eg. r5/r6
*((uint64_t*) &gpregs[gpr]) = tempu64;
gpr += 2;
}
else {
if ((uint32_t) d & 4) d++; // longlongs are 8-byte aligned on stack
*((uint64_t*) d) = tempu64;
d += 2;
}
}
else {
if (gpr < GPR_COUNT)
gpregs[gpr++] = tempu32;
else
*d++ = tempu32;
}
}
}
extern "C"
XPTC_PUBLIC_API(nsresult)
XPTC_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
uint32_t paramCount, nsXPTCVariant* params);
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