зеркало из https://github.com/mozilla/gecko-dev.git
110 строки
4.3 KiB
C++
110 строки
4.3 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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// The purpose of NS_InvokeByIndex() is to map a platform
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// indepenpent call to the platform ABI. To do that,
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// NS_InvokeByIndex() has to determine the method to call via vtable
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// access. The parameters for the method are read from the
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// nsXPTCVariant* and prepared for th native ABI. For the Linux/PPC
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// ABI this means that the first 8 integral and floating point
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// parameters are passed in registers.
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#include "xptcprivate.h"
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// 8 integral parameters are passed in registers
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#define GPR_COUNT 8
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// 8 floating point parameters are passed in registers, floats are
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// promoted to doubles when passed in registers
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#define FPR_COUNT 8
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extern "C" uint32_t
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invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
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{
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return uint32_t(((paramCount * 2) + 3) & ~3);
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}
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extern "C" void
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invoke_copy_to_stack(uint32_t* d,
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uint32_t paramCount,
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nsXPTCVariant* s,
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uint32_t* gpregs,
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double* fpregs)
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{
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uint32_t gpr = 1; // skip one GP reg for 'that'
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uint32_t fpr = 0;
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uint32_t tempu32;
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uint64_t tempu64;
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for(uint32_t i = 0; i < paramCount; i++, s++) {
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if(s->IsPtrData()) {
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if(s->type == nsXPTType::T_JSVAL)
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tempu32 = (uint32_t) &(s->ptr);
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else
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tempu32 = (uint32_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: tempu32 = s->val.i8; break;
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case nsXPTType::T_I16: tempu32 = s->val.i16; break;
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case nsXPTType::T_I32: tempu32 = s->val.i32; break;
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case nsXPTType::T_I64: tempu64 = s->val.i64; break;
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case nsXPTType::T_U8: tempu32 = s->val.u8; break;
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case nsXPTType::T_U16: tempu32 = s->val.u16; break;
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case nsXPTType::T_U32: tempu32 = s->val.u32; break;
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case nsXPTType::T_U64: tempu64 = s->val.u64; break;
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case nsXPTType::T_BOOL: tempu32 = s->val.b; break;
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case nsXPTType::T_CHAR: tempu32 = s->val.c; break;
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case nsXPTType::T_WCHAR: tempu32 = s->val.wc; break;
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default: tempu32 = (uint32_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 (fpr < FPR_COUNT)
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fpregs[fpr++] = s->val.d;
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else {
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if ((uint32_t) d & 4) d++; // doubles are 8-byte aligned on stack
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*((double*) d) = s->val.d;
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d += 2;
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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 (fpr < FPR_COUNT)
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fpregs[fpr++] = s->val.f; // if passed in registers, floats are promoted to doubles
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else
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*((float*) d++) = s->val.f;
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}
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else if (!s->IsPtrData() && (s->type == nsXPTType::T_I64
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|| s->type == nsXPTType::T_U64)) {
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if ((gpr + 1) < GPR_COUNT) {
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if (gpr & 1) gpr++; // longlongs are aligned in odd/even register pairs, eg. r5/r6
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*((uint64_t*) &gpregs[gpr]) = tempu64;
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gpr += 2;
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}
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else {
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if ((uint32_t) d & 4) d++; // longlongs are 8-byte aligned on stack
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*((uint64_t*) d) = tempu64;
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d += 2;
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}
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}
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else {
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if (gpr < GPR_COUNT)
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gpregs[gpr++] = tempu32;
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else
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*d++ = tempu32;
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}
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}
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}
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extern "C"
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EXPORT_XPCOM_API(nsresult)
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NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
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uint32_t paramCount, nsXPTCVariant* params);
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