76 lines
2.9 KiB
C++
76 lines
2.9 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Platform specific code to invoke XPCOM methods on native objects
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#include "xptcprivate.h"
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// 6 integral parameters are passed in registers, but 1 is |this| which isn't
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// considered here.
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const uint32_t GPR_COUNT = 5;
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// 8 floating point parameters are passed in SSE registers
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const uint32_t FPR_COUNT = 8;
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extern "C" void
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InvokeCopyToStack(uint64_t * gpregs, double * fpregs,
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uint32_t paramCount, nsXPTCVariant * s,
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uint64_t* d)
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{
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uint32_t nr_gpr = 0u; // skip one GP register for 'that'
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uint32_t nr_fpr = 0u;
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uint64_t value = 0u;
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for (uint32_t i = 0; i < paramCount; i++, s++) {
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if (s->IsPtrData())
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value = (uint64_t) s->ptr;
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else {
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switch (s->type) {
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case nsXPTType::T_FLOAT: break;
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case nsXPTType::T_DOUBLE: break;
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case nsXPTType::T_I8: value = s->val.i8; break;
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case nsXPTType::T_I16: value = s->val.i16; break;
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case nsXPTType::T_I32: value = s->val.i32; break;
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case nsXPTType::T_I64: value = s->val.i64; break;
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case nsXPTType::T_U8: value = s->val.u8; break;
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case nsXPTType::T_U16: value = s->val.u16; break;
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case nsXPTType::T_U32: value = s->val.u32; break;
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case nsXPTType::T_U64: value = s->val.u64; break;
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case nsXPTType::T_BOOL: value = s->val.b; break;
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case nsXPTType::T_CHAR: value = s->val.c; break;
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case nsXPTType::T_WCHAR: value = s->val.wc; break;
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default: value = (uint64_t) s->val.p; break;
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}
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}
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if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
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if (nr_fpr < FPR_COUNT)
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fpregs[nr_fpr++] = s->val.d;
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else {
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*((double *)d) = s->val.d;
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d++;
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}
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}
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else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
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if (nr_fpr < FPR_COUNT)
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// The value in %xmm register is already prepared to
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// be retrieved as a float. Therefore, we pass the
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// value verbatim, as a double without conversion.
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fpregs[nr_fpr++] = s->val.d;
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else {
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*((float *)d) = s->val.f;
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d++;
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}
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}
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else {
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if (nr_gpr < GPR_COUNT)
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gpregs[nr_gpr++] = value;
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else
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*d++ = value;
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}
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}
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}
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