The Tor Browser: xpcom/reflect/xptcall/src/md/unix/xptcstubs_arm

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /* Implement shared vtbl methods. */

     8 #include "xptcprivate.h"

    10 nsresult ATTRIBUTE_USED

    11 PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint32_t* args)

    12 {

    13 #define PARAM_BUFFER_COUNT     16

    15     nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];

    16     nsXPTCMiniVariant* dispatchParams = nullptr;

    17     nsIInterfaceInfo* iface_info = nullptr;

    18     const nsXPTMethodInfo* info;

    19     uint8_t paramCount;

    20     uint8_t i;

    21     nsresult result = NS_ERROR_FAILURE;

    23     NS_ASSERTION(self,"no self");

    25     self->GetInterfaceInfo(&iface_info);

    26     NS_ASSERTION(iface_info,"no interface info");

    28     iface_info->GetMethodInfo(uint16_t(methodIndex), &info);

    29     NS_ASSERTION(info,"no interface info");

    31     paramCount = info->GetParamCount();

    33     // setup variant array pointer

    34     if(paramCount > PARAM_BUFFER_COUNT)

    35         dispatchParams = new nsXPTCMiniVariant[paramCount];

    36     else

    37         dispatchParams = paramBuffer;

    38     NS_ASSERTION(dispatchParams,"no place for params");

    40     uint32_t* ap = args;

    41     for(i = 0; i < paramCount; i++, ap++)

    42     {

    43         const nsXPTParamInfo& param = info->GetParam(i);

    44         const nsXPTType& type = param.GetType();

    45         nsXPTCMiniVariant* dp = &dispatchParams[i];

    47         if(param.IsOut() || !type.IsArithmetic())

    48         {

    49             dp->val.p = (void*) *ap;

    50             continue;

    51         }

    52         // else

    53         switch(type)

    54         {

    55         case nsXPTType::T_I8     : dp->val.i8  = *((int8_t*)  ap);       break;

    56         case nsXPTType::T_I16    : dp->val.i16 = *((int16_t*) ap);       break;

    57         case nsXPTType::T_I32    : dp->val.i32 = *((int32_t*) ap);       break;

    58         case nsXPTType::T_I64    : dp->val.i64 = *((int64_t*) ap); ap++; break;

    59         case nsXPTType::T_U8     : dp->val.u8  = *((uint8_t*) ap);       break;

    60         case nsXPTType::T_U16    : dp->val.u16 = *((uint16_t*)ap);       break;

    61         case nsXPTType::T_U32    : dp->val.u32 = *((uint32_t*)ap);       break;

    62         case nsXPTType::T_U64    : dp->val.u64 = *((uint64_t*)ap); ap++; break;

    63         case nsXPTType::T_FLOAT  : dp->val.f   = *((float*)   ap);       break;

    64         case nsXPTType::T_DOUBLE : dp->val.d   = *((double*)  ap); ap++; break;

    65         case nsXPTType::T_BOOL   : dp->val.b   = *((bool*)  ap);       break;

    66         case nsXPTType::T_CHAR   : dp->val.c   = *((char*)    ap);       break;

    67         case nsXPTType::T_WCHAR  : dp->val.wc  = *((wchar_t*) ap);       break;

    68         default:

    69             NS_ERROR("bad type");

    70             break;

    71         }

    72     }

    74     result = self->CallMethod((uint16_t)methodIndex, info, dispatchParams);

    76     NS_RELEASE(iface_info);

    78     if(dispatchParams != paramBuffer)

    79         delete [] dispatchParams;

    81     return result;

    82 }

    84 /*

    85  * These stubs move just move the values passed in registers onto the stack,

    86  * so they are contiguous with values passed on the stack, and then calls

    87  * PrepareAndDispatch() to do the dirty work.

    88  */

    90 #define STUB_ENTRY(n)							\

    91 __asm__(								\

    92     ".global	_Stub"#n"__14nsXPTCStubBase\n\t"			\

    93 "_Stub"#n"__14nsXPTCStubBase:\n\t"					\

    94     "stmfd	sp!, {r1, r2, r3}	\n\t"				\

    95     "mov	ip, sp			\n\t"				\

    96     "stmfd	sp!, {fp, ip, lr, pc}	\n\t"				\

    97     "sub	fp, ip, #4		\n\t"				\

    98     "mov	r1, #"#n"		\n\t"    /* = methodIndex 	*/ \

    99     "add	r2, sp, #16		\n\t"				\

   100     "bl		_PrepareAndDispatch__FP14nsXPTCStubBaseUiPUi   \n\t"	\

   101     "ldmea	fp, {fp, sp, lr}	\n\t"				\

   102     "add	sp, sp, #12		\n\t"				\

   103     "mov	pc, lr			\n\t"				\

   104 );

   106 #define SENTINEL_ENTRY(n) \

   107 nsresult nsXPTCStubBase::Sentinel##n() \

   108 { \

   109     NS_ERROR("nsXPTCStubBase::Sentinel called"); \

   110     return NS_ERROR_NOT_IMPLEMENTED; \

   111 }

   113 #include "xptcstubsdef.inc"

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