зеркало из https://github.com/mozilla/gecko-dev.git
205 строки
6.8 KiB
C++
205 строки
6.8 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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/* Implement shared vtbl methods. */
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#include "xptcprivate.h"
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#ifdef __GNUC__
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/* This tells gcc3.4+ not to optimize away symbols.
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* @see http://gcc.gnu.org/gcc-3.4/changes.html
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*/
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#define DONT_DROP_OR_WARN __attribute__((used))
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#else
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/* This tells older gccs not to warn about unused vairables.
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* @see http://docs.freebsd.org/info/gcc/gcc.info.Variable_Attributes.html
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*/
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#define DONT_DROP_OR_WARN __attribute__((unused))
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#endif
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/* Specify explicitly a symbol for this function, don't try to guess the c++ mangled symbol. */
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static nsresult PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args) asm("_PrepareAndDispatch")
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DONT_DROP_OR_WARN;
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static nsresult ATTRIBUTE_USED
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PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args)
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{
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#define PARAM_BUFFER_COUNT 16
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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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uint8_t paramCount;
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uint8_t i;
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nsresult result = NS_ERROR_FAILURE;
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NS_ASSERTION(self,"no self");
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self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
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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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if (!dispatchParams)
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return NS_ERROR_OUT_OF_MEMORY;
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uint32_t* ap = args;
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for(i = 0; i < paramCount; i++, ap++)
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{
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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(param.IsOut() || !type.IsArithmetic())
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{
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dp->val.p = (void*) *ap;
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continue;
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}
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// else
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switch(type)
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{
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case nsXPTType::T_I8 : dp->val.i8 = *((int8_t*) ap); break;
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case nsXPTType::T_I16 : dp->val.i16 = *((int16_t*) ap); break;
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case nsXPTType::T_I32 : dp->val.i32 = *((int32_t*) ap); break;
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case nsXPTType::T_I64 : dp->val.i64 = *((int64_t*) ap); ap++; break;
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case nsXPTType::T_U8 : dp->val.u8 = *((uint8_t*) ap); break;
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case nsXPTType::T_U16 : dp->val.u16 = *((uint16_t*)ap); break;
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case nsXPTType::T_U32 : dp->val.u32 = *((uint32_t*)ap); break;
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case nsXPTType::T_U64 : dp->val.u64 = *((uint64_t*)ap); ap++; break;
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case nsXPTType::T_FLOAT : dp->val.f = *((float*) ap); break;
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case nsXPTType::T_DOUBLE : dp->val.d = *((double*) ap); ap++; break;
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case nsXPTType::T_BOOL : dp->val.b = *((bool*) ap); break;
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case nsXPTType::T_CHAR : dp->val.c = *((char*) ap); break;
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case nsXPTType::T_WCHAR : dp->val.wc = *((wchar_t*) ap); 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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result = self->mOuter->CallMethod((uint16_t)methodIndex, info, 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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/*
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* This is our shared stub.
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*
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* r0 = Self.
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*
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* The Rules:
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* We pass an (undefined) number of arguments into this function.
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* The first 3 C++ arguments are in r1 - r3, the rest are built
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* by the calling function on the stack.
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*
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* We are allowed to corrupt r0 - r3, ip, and lr.
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*
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* Other Info:
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* We pass the stub number in using `ip'.
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*
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* Implementation:
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* - We save r1 to r3 inclusive onto the stack, which will be
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* immediately below the caller saved arguments.
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* - setup r2 (PrepareAndDispatch's args pointer) to point at
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* the base of all these arguments
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* - Save LR (for the return address)
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* - Set r1 (PrepareAndDispatch's methodindex argument) from ip
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* - r0 is passed through (self)
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* - Call PrepareAndDispatch
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* - When the call returns, we return by loading the PC off the
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* stack, and undoing the stack (one instruction)!
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*
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*/
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__asm__ ("\n\
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.text \n\
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.align 2 \n\
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SharedStub: \n\
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stmfd sp!, {r1, r2, r3} \n\
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mov r2, sp \n\
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str lr, [sp, #-4]! \n\
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mov r1, ip \n\
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bl _PrepareAndDispatch \n\
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ldr pc, [sp], #16");
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/*
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* Create sets of stubs to call the SharedStub.
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* We don't touch the stack here, nor any registers, other than IP.
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* IP is defined to be corruptable by a called function, so we are
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* safe to use it.
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*
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* This will work with or without optimisation.
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*/
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/*
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* Note : As G++3 ABI contains the length of the functionname in the
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* mangled name, it is difficult to get a generic assembler mechanism like
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* in the G++ 2.95 case.
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* Create names would be like :
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* _ZN14nsXPTCStubBase5Stub9Ev
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* _ZN14nsXPTCStubBase6Stub13Ev
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* _ZN14nsXPTCStubBase7Stub144Ev
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* Use the assembler directives to get the names right...
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*/
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#define STUB_ENTRY(n) \
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__asm__( \
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".section \".text\"\n" \
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" .align 2\n" \
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" .iflt ("#n" - 10)\n" \
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" .globl _ZN14nsXPTCStubBase5Stub"#n"Ev\n" \
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" .type _ZN14nsXPTCStubBase5Stub"#n"Ev,#function\n" \
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"_ZN14nsXPTCStubBase5Stub"#n"Ev:\n" \
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" .else\n" \
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" .iflt ("#n" - 100)\n" \
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" .globl _ZN14nsXPTCStubBase6Stub"#n"Ev\n" \
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" .type _ZN14nsXPTCStubBase6Stub"#n"Ev,#function\n" \
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"_ZN14nsXPTCStubBase6Stub"#n"Ev:\n" \
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" .else\n" \
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" .iflt ("#n" - 1000)\n" \
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" .globl _ZN14nsXPTCStubBase7Stub"#n"Ev\n" \
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" .type _ZN14nsXPTCStubBase7Stub"#n"Ev,#function\n" \
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"_ZN14nsXPTCStubBase7Stub"#n"Ev:\n" \
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" .else\n" \
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" .err \"stub number "#n"> 1000 not yet supported\"\n" \
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" .endif\n" \
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" .endif\n" \
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" .endif\n" \
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" mov ip, #"#n"\n" \
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" b SharedStub\n\t");
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#if 0
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/*
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* This part is left in as comment : this is how the method definition
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* should look like.
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*/
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#define STUB_ENTRY(n) \
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nsresult nsXPTCStubBase::Stub##n () \
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{ \
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__asm__ ( \
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" mov ip, #"#n"\n" \
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" b SharedStub\n\t"); \
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return 0; /* avoid warnings */ \
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}
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#endif
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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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