michael@0: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* Implement shared vtbl methods. */
michael@0: 
michael@0: #include "xptcprivate.h"
michael@0: #include "xptiprivate.h"
michael@0: 
michael@0: #ifndef WIN32
michael@0: #error "This code is for Win32 only"
michael@0: #endif
michael@0: 
michael@0: extern "C" {
michael@0: 
michael@0: #ifndef __GNUC__
michael@0: static
michael@0: #endif
michael@0: nsresult __stdcall
michael@0: PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex,
michael@0:                    uint32_t* args, uint32_t* stackBytesToPop)
michael@0: {
michael@0: #define PARAM_BUFFER_COUNT     16
michael@0: 
michael@0:     nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
michael@0:     nsXPTCMiniVariant* dispatchParams = nullptr;
michael@0:     const nsXPTMethodInfo* info = nullptr;
michael@0:     uint8_t paramCount;
michael@0:     uint8_t i;
michael@0:     nsresult result = NS_ERROR_FAILURE;
michael@0: 
michael@0:     // If anything fails before stackBytesToPop can be set then
michael@0:     // the failure is completely catastrophic!
michael@0: 
michael@0:     NS_ASSERTION(self,"no self");
michael@0: 
michael@0:     self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
michael@0:     NS_ASSERTION(info,"no method info");
michael@0: 
michael@0:     paramCount = info->GetParamCount();
michael@0: 
michael@0:     // setup variant array pointer
michael@0:     if(paramCount > PARAM_BUFFER_COUNT)
michael@0:         dispatchParams = new nsXPTCMiniVariant[paramCount];
michael@0:     else
michael@0:         dispatchParams = paramBuffer;
michael@0:     NS_ASSERTION(dispatchParams,"no place for params");
michael@0: 
michael@0:     uint32_t* ap = args;
michael@0:     for(i = 0; i < paramCount; i++, ap++)
michael@0:     {
michael@0:         const nsXPTParamInfo& param = info->GetParam(i);
michael@0:         const nsXPTType& type = param.GetType();
michael@0:         nsXPTCMiniVariant* dp = &dispatchParams[i];
michael@0: 
michael@0:         if(param.IsOut() || !type.IsArithmetic())
michael@0:         {
michael@0:             dp->val.p = (void*) *ap;
michael@0:             continue;
michael@0:         }
michael@0:         // else
michael@0:         switch(type)
michael@0:         {
michael@0:         case nsXPTType::T_I8     : dp->val.i8  = *((int8_t*)  ap);       break;
michael@0:         case nsXPTType::T_I16    : dp->val.i16 = *((int16_t*) ap);       break;
michael@0:         case nsXPTType::T_I32    : dp->val.i32 = *((int32_t*) ap);       break;
michael@0:         case nsXPTType::T_I64    : dp->val.i64 = *((int64_t*) ap); ap++; break;
michael@0:         case nsXPTType::T_U8     : dp->val.u8  = *((uint8_t*) ap);       break;
michael@0:         case nsXPTType::T_U16    : dp->val.u16 = *((uint16_t*)ap);       break;
michael@0:         case nsXPTType::T_U32    : dp->val.u32 = *((uint32_t*)ap);       break;
michael@0:         case nsXPTType::T_U64    : dp->val.u64 = *((uint64_t*)ap); ap++; break;
michael@0:         case nsXPTType::T_FLOAT  : dp->val.f   = *((float*)   ap);       break;
michael@0:         case nsXPTType::T_DOUBLE : dp->val.d   = *((double*)  ap); ap++; break;
michael@0:         case nsXPTType::T_BOOL   : dp->val.b   = *((bool*)  ap);       break;
michael@0:         case nsXPTType::T_CHAR   : dp->val.c   = *((char*)    ap);       break;
michael@0:         case nsXPTType::T_WCHAR  : dp->val.wc  = *((wchar_t*) ap);       break;
michael@0:         default:
michael@0:             NS_ERROR("bad type");
michael@0:             break;
michael@0:         }
michael@0:     }
michael@0:     *stackBytesToPop = ((uint32_t)ap) - ((uint32_t)args);
michael@0: 
michael@0:     result = self->mOuter->CallMethod((uint16_t)methodIndex, info, dispatchParams);
michael@0: 
michael@0:     if(dispatchParams != paramBuffer)
michael@0:         delete [] dispatchParams;
michael@0: 
michael@0:     return result;
michael@0: }
michael@0: 
michael@0: } // extern "C"
michael@0: 
michael@0: // declspec(naked) is broken in gcc
michael@0: #ifndef __GNUC__
michael@0: static 
michael@0: __declspec(naked)
michael@0: void SharedStub(void)
michael@0: {
michael@0:     __asm {
michael@0:         push ebp            // set up simple stack frame
michael@0:         mov  ebp, esp       // stack has: ebp/vtbl_index/retaddr/this/args
michael@0:         push ecx            // make room for a ptr
michael@0:         lea  eax, [ebp-4]   // pointer to stackBytesToPop
michael@0:         push eax
michael@0:         lea  eax, [ebp+12]  // pointer to args
michael@0:         push eax
michael@0:         push ecx            // vtbl_index
michael@0:         mov  eax, [ebp+8]   // this
michael@0:         push eax
michael@0:         call PrepareAndDispatch
michael@0:         mov  edx, [ebp+4]   // return address
michael@0:         mov  ecx, [ebp-4]   // stackBytesToPop
michael@0:         add  ecx, 8         // for 'this' and return address
michael@0:         mov  esp, ebp
michael@0:         pop  ebp
michael@0:         add  esp, ecx       // fix up stack pointer
michael@0:         jmp  edx            // simulate __stdcall return
michael@0:     }
michael@0: }
michael@0: 
michael@0: // these macros get expanded (many times) in the file #included below
michael@0: #define STUB_ENTRY(n) \
michael@0: __declspec(naked) nsresult __stdcall nsXPTCStubBase::Stub##n() \
michael@0: { __asm mov ecx, n __asm jmp SharedStub }
michael@0: 
michael@0: #else
michael@0: 
michael@0: asm(".text\n\t"
michael@0:     ".align     4\n\t"
michael@0:     "SharedStub:\n\t"
michael@0:     "push       %ebp\n\t"
michael@0:     "mov        %esp, %ebp\n\t"
michael@0:     "push       %ecx\n\t"
michael@0:     "lea        -4(%ebp), %eax\n\t"
michael@0:     "push       %eax\n\t"
michael@0:     "lea        12(%ebp), %eax\n\t"
michael@0:     "push       %eax\n\t"
michael@0:     "push       %ecx\n\t"
michael@0:     "movl       8(%ebp), %eax\n\t"
michael@0:     "push       %eax\n\t"
michael@0:     "call       _PrepareAndDispatch@16\n\t"
michael@0:     "mov        4(%ebp), %edx\n\t"
michael@0:     "mov        -4(%ebp), %ecx\n\t"
michael@0:     "add        $8, %ecx\n\t"
michael@0:     "mov        %ebp, %esp\n\t"
michael@0:     "pop        %ebp\n\t"
michael@0:     "add        %ecx, %esp\n\t"
michael@0:     "jmp        *%edx"
michael@0: );
michael@0: 
michael@0: #define STUB_ENTRY(n) \
michael@0: asm(".text\n\t" \
michael@0:     ".align     4\n\t" \
michael@0:     ".if	" #n " < 10\n\t" \
michael@0:     ".globl     __ZN14nsXPTCStubBase5Stub" #n "Ev@4\n\t" \
michael@0:     ".def       __ZN14nsXPTCStubBase5Stub" #n "Ev@4; \n\t" \
michael@0:     ".scl       3\n\t" \
michael@0:     ".type      46\n\t" \
michael@0:     ".endef\n\t" \
michael@0:     "__ZN14nsXPTCStubBase5Stub" #n "Ev@4:\n\t" \
michael@0:     ".elseif	" #n " < 100\n\t" \
michael@0:     ".globl     __ZN14nsXPTCStubBase6Stub" #n "Ev@4\n\t" \
michael@0:     ".def       __ZN14nsXPTCStubBase6Stub" #n "Ev@4\n\t" \
michael@0:     ".scl       3\n\t" \
michael@0:     ".type      46\n\t" \
michael@0:     ".endef\n\t" \
michael@0:     "__ZN14nsXPTCStubBase6Stub" #n "Ev@4:\n\t" \
michael@0:     ".elseif    " #n " < 1000\n\t" \
michael@0:     ".globl     __ZN14nsXPTCStubBase7Stub" #n "Ev@4\n\t" \
michael@0:     ".def       __ZN14nsXPTCStubBase7Stub" #n "Ev@4\n\t" \
michael@0:     ".scl       3\n\t" \
michael@0:     ".type      46\n\t" \
michael@0:     ".endef\n\t" \
michael@0:     "__ZN14nsXPTCStubBase7Stub" #n "Ev@4:\n\t" \
michael@0:     ".else\n\t" \
michael@0:     ".err	\"stub number " #n " >= 1000 not yet supported\"\n\t" \
michael@0:     ".endif\n\t" \
michael@0:     "mov $" #n ", %ecx\n\t" \
michael@0:     "jmp SharedStub");
michael@0: 
michael@0: #endif /* __GNUC__ */
michael@0: 
michael@0: #define SENTINEL_ENTRY(n) \
michael@0: nsresult __stdcall nsXPTCStubBase::Sentinel##n() \
michael@0: { \
michael@0:     NS_ERROR("nsXPTCStubBase::Sentinel called"); \
michael@0:     return NS_ERROR_NOT_IMPLEMENTED; \
michael@0: }
michael@0: 
michael@0: #ifdef _MSC_VER
michael@0: #pragma warning(disable : 4035) // OK to have no return value
michael@0: #endif
michael@0: #include "xptcstubsdef.inc"
michael@0: #ifdef _MSC_VER
michael@0: #pragma warning(default : 4035) // restore default
michael@0: #endif
michael@0: 
michael@0: void
michael@0: #ifdef __GNUC__
michael@0: __cdecl
michael@0: #endif
michael@0: xptc_dummy()
michael@0: {
michael@0: }