зеркало из https://github.com/mozilla/gecko-dev.git
197 строки
6.6 KiB
C++
197 строки
6.6 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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// Implement shared vtbl methods.
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// Keep this in sync with the linux version.
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#include "xptcprivate.h"
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// The Darwin/x86-64 ABI passes the first 6 integer parameters and the
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// first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
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// r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
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// caller. The rest of the parameters are passed in the callers stack
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// area.
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const uint32_t PARAM_BUFFER_COUNT = 16;
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const uint32_t GPR_COUNT = 6;
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const uint32_t FPR_COUNT = 8;
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// PrepareAndDispatch() is called by SharedStub() and calls the actual method.
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//
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// - 'args[]' contains the arguments passed on stack
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// - 'gpregs[]' contains the arguments passed in integer registers
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// - 'fpregs[]' contains the arguments passed in floating point registers
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//
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// The parameters are mapped into an array of type 'nsXPTCMiniVariant'
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// and then the method gets called.
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extern "C" nsresult ATTRIBUTE_USED
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PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex,
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uint64_t * args, uint64_t * gpregs, double *fpregs)
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{
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nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
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nsXPTCMiniVariant* dispatchParams = nullptr;
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const nsXPTMethodInfo* info;
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uint32_t paramCount;
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uint32_t i;
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NS_ASSERTION(self,"no self");
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self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
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NS_ASSERTION(info,"no method info");
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if (!info)
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return NS_ERROR_UNEXPECTED;
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paramCount = info->GetParamCount();
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// setup variant array pointer
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if (paramCount > PARAM_BUFFER_COUNT)
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dispatchParams = new nsXPTCMiniVariant[paramCount];
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else
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dispatchParams = paramBuffer;
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NS_ASSERTION(dispatchParams,"no place for params");
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const uint8_t indexOfJSContext = info->IndexOfJSContext();
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uint64_t* ap = args;
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uint32_t nr_gpr = 1; // skip one GPR register for 'that'
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uint32_t nr_fpr = 0;
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uint64_t value;
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for (i = 0; i < paramCount; i++) {
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const nsXPTParamInfo& param = info->GetParam(i);
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const nsXPTType& type = param.GetType();
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nsXPTCMiniVariant* dp = &dispatchParams[i];
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if (i == indexOfJSContext) {
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if (nr_gpr < GPR_COUNT)
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nr_gpr++;
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else
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ap++;
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}
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if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
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if (nr_fpr < FPR_COUNT)
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dp->val.d = fpregs[nr_fpr++];
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else
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dp->val.d = *(double*) ap++;
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continue;
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}
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else if (!param.IsOut() && 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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dp->val.d = fpregs[nr_fpr++];
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else
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dp->val.f = *(float*) ap++;
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continue;
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}
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else {
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if (nr_gpr < GPR_COUNT)
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value = gpregs[nr_gpr++];
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else
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value = *ap++;
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}
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if (param.IsOut() || !type.IsArithmetic()) {
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dp->val.p = (void*) value;
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continue;
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}
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switch (type) {
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case nsXPTType::T_I8: dp->val.i8 = (int8_t) value; break;
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case nsXPTType::T_I16: dp->val.i16 = (int16_t) value; break;
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case nsXPTType::T_I32: dp->val.i32 = (int32_t) value; break;
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case nsXPTType::T_I64: dp->val.i64 = (int64_t) value; break;
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case nsXPTType::T_U8: dp->val.u8 = (uint8_t) value; break;
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case nsXPTType::T_U16: dp->val.u16 = (uint16_t) value; break;
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case nsXPTType::T_U32: dp->val.u32 = (uint32_t) value; break;
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case nsXPTType::T_U64: dp->val.u64 = (uint64_t) value; break;
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// Cast to uint8_t first, to remove garbage on upper 56 bits.
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case nsXPTType::T_BOOL: dp->val.b = (bool)(uint8_t) value; break;
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case nsXPTType::T_CHAR: dp->val.c = (char) value; break;
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case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break;
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default:
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NS_ERROR("bad type");
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break;
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}
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}
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nsresult result = self->mOuter->CallMethod((uint16_t) methodIndex, info,
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dispatchParams);
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if (dispatchParams != paramBuffer)
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delete [] dispatchParams;
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return result;
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}
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// Darwin/x86-64 uses gcc >= 4.2
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#define STUB_ENTRY(n) \
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asm(".section __TEXT,__text\n\t" \
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".align 3\n\t" \
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".if " #n " < 10\n\t" \
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".globl __ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
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"__ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
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".elseif " #n " < 100\n\t" \
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".globl __ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
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"__ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
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".elseif " #n " < 1000\n\t" \
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".globl __ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
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"__ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
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".else\n\t" \
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".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \
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".endif\n\t" \
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"movl $" #n ", %eax\n\t" \
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"jmp SharedStub\n\t");
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// static nsresult SharedStub(uint32_t methodIndex)
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asm(".section __TEXT,__text\n\t"
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".align 3\n\t"
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"SharedStub:\n\t"
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// make room for gpregs (48), fpregs (64)
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"pushq %rbp\n\t"
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"movq %rsp,%rbp\n\t"
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"subq $112,%rsp\n\t"
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// save GP registers
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"movq %rdi,-112(%rbp)\n\t"
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"movq %rsi,-104(%rbp)\n\t"
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"movq %rdx, -96(%rbp)\n\t"
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"movq %rcx, -88(%rbp)\n\t"
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"movq %r8 , -80(%rbp)\n\t"
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"movq %r9 , -72(%rbp)\n\t"
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"leaq -112(%rbp),%rcx\n\t"
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// save FP registers
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"movsd %xmm0,-64(%rbp)\n\t"
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"movsd %xmm1,-56(%rbp)\n\t"
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"movsd %xmm2,-48(%rbp)\n\t"
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"movsd %xmm3,-40(%rbp)\n\t"
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"movsd %xmm4,-32(%rbp)\n\t"
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"movsd %xmm5,-24(%rbp)\n\t"
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"movsd %xmm6,-16(%rbp)\n\t"
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"movsd %xmm7, -8(%rbp)\n\t"
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"leaq -64(%rbp),%r8\n\t"
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// rdi has the 'self' pointer already
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"movl %eax,%esi\n\t"
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"leaq 16(%rbp),%rdx\n\t"
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"call _PrepareAndDispatch\n\t"
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"leave\n\t"
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"ret\n\t");
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#define SENTINEL_ENTRY(n) \
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nsresult nsXPTCStubBase::Sentinel##n() \
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{ \
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NS_ERROR("nsXPTCStubBase::Sentinel called"); \
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return NS_ERROR_NOT_IMPLEMENTED; \
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}
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#include "xptcstubsdef.inc"
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