mirror of
https://github.com/classilla/tenfourfox.git
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144 lines
5.3 KiB
C++
144 lines
5.3 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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#include "alloca.h"
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// 6 integral parameters are passed in registers
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const uint32_t GPR_COUNT = 6;
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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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// Remember that these 'words' are 64-bit long
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static inline void
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invoke_count_words(uint32_t paramCount, nsXPTCVariant * s,
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uint32_t & nr_gpr, uint32_t & nr_fpr, uint32_t & nr_stack)
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{
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nr_gpr = 1; // skip one GP register for 'that'
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nr_fpr = 0;
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nr_stack = 0;
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/* Compute number of eightbytes of class MEMORY. */
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for (uint32_t i = 0; i < paramCount; i++, s++) {
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if (!s->IsPtrData()
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&& (s->type == nsXPTType::T_FLOAT || s->type == nsXPTType::T_DOUBLE)) {
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if (nr_fpr < FPR_COUNT)
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nr_fpr++;
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else
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nr_stack++;
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}
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else {
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if (nr_gpr < GPR_COUNT)
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nr_gpr++;
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else
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nr_stack++;
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}
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}
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}
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static void
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invoke_copy_to_stack(uint64_t * d, uint32_t paramCount, nsXPTCVariant * s,
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uint64_t * gpregs, double * fpregs)
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{
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uint32_t nr_gpr = 1; // skip one GP register for 'that'
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uint32_t nr_fpr = 0;
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uint64_t value;
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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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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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{
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uint32_t nr_gpr, nr_fpr, nr_stack;
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invoke_count_words(paramCount, params, nr_gpr, nr_fpr, nr_stack);
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// Stack, if used, must be 16-bytes aligned
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if (nr_stack)
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nr_stack = (nr_stack + 1) & ~1;
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// Load parameters to stack, if necessary
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uint64_t *stack = (uint64_t *) __builtin_alloca(nr_stack * 8);
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uint64_t gpregs[GPR_COUNT];
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double fpregs[FPR_COUNT];
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invoke_copy_to_stack(stack, paramCount, params, gpregs, fpregs);
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switch (nr_fpr) {
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case 8: asm("movupd %0, %xmm7" : : "xmm7" (fpregs[7]));
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case 7: asm("movupd %0, %xmm6" : : "xmm6" (fpregs[6]));
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case 6: asm("movupd %0, %xmm5" : : "xmm5" (fpregs[5]));
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case 5: asm("movupd %0, %xmm4" : : "xmm4" (fpregs[4]));
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case 4: asm("movupd %0, %xmm3" : : "xmm3" (fpregs[3]));
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case 3: asm("movupd %0, %xmm2" : : "xmm2" (fpregs[2]));
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case 2: asm("movupd %0, %xmm1" : : "xmm1" (fpregs[1]));
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case 1: asm("movupd %0, %xmm0" : : "xmm0" (fpregs[0]));
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case 0:;
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}
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// Ensure that assignments to SSE registers won't be optimized away
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asm("" ::: "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7");
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// Get pointer to method
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uint64_t methodAddress = *((uint64_t *)that);
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methodAddress += 16 + 8 * methodIndex;
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methodAddress = *((uint64_t *)methodAddress);
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typedef uint32_t (*Method)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
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uint32_t result = ((Method)methodAddress)((uint64_t)that, gpregs[1], gpregs[2], gpregs[3], gpregs[4], gpregs[5]);
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return result;
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}
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