diff options
Diffstat (limited to 'xpcom/reflect/xptcall/md/win32/xptcstubs.cpp')
| -rw-r--r-- | xpcom/reflect/xptcall/md/win32/xptcstubs.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/win32/xptcstubs.cpp b/xpcom/reflect/xptcall/md/win32/xptcstubs.cpp new file mode 100644 index 0000000000..58ebc69a39 --- /dev/null +++ b/xpcom/reflect/xptcall/md/win32/xptcstubs.cpp @@ -0,0 +1,138 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* Implement shared vtbl methods. */ + +#include "xptcprivate.h" + +#ifndef WIN32 +#error "This code is for Win32 only" +#endif + +extern "C" { + +static +nsresult __stdcall +PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, + uint32_t* args, uint32_t* stackBytesToPop) +{ + + nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT]; + const nsXPTMethodInfo* info = nullptr; + uint8_t paramCount; + uint8_t i; + + // If anything fails before stackBytesToPop can be set then + // the failure is completely catastrophic! + + NS_ASSERTION(self,"no self"); + + self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info); + NS_ASSERTION(info,"no method info"); + + paramCount = info->GetParamCount(); + + const uint8_t indexOfJSContext = info->IndexOfJSContext(); + + uint32_t* ap = args; + for(i = 0; i < paramCount; i++, ap++) + { + const nsXPTParamInfo& param = info->GetParam(i); + const nsXPTType& type = param.GetType(); + nsXPTCMiniVariant* dp = ¶mBuffer[i]; + + if (i == indexOfJSContext) + ap++; + + if(param.IsOut() || !type.IsArithmetic()) + { + dp->val.p = (void*) *ap; + continue; + } + // else + switch(type) + { + case nsXPTType::T_I8 : dp->val.i8 = *((int8_t*) ap); break; + case nsXPTType::T_I16 : dp->val.i16 = *((int16_t*) ap); break; + case nsXPTType::T_I32 : dp->val.i32 = *((int32_t*) ap); break; + case nsXPTType::T_I64 : dp->val.i64 = *((int64_t*) ap); ap++; break; + case nsXPTType::T_U8 : dp->val.u8 = *((uint8_t*) ap); break; + case nsXPTType::T_U16 : dp->val.u16 = *((uint16_t*)ap); break; + case nsXPTType::T_U32 : dp->val.u32 = *((uint32_t*)ap); break; + case nsXPTType::T_U64 : dp->val.u64 = *((uint64_t*)ap); ap++; break; + case nsXPTType::T_FLOAT : dp->val.f = *((float*) ap); break; + case nsXPTType::T_DOUBLE : dp->val.d = *((double*) ap); ap++; break; + case nsXPTType::T_BOOL : dp->val.b = *((bool*) ap); break; + case nsXPTType::T_CHAR : dp->val.c = *((char*) ap); break; + case nsXPTType::T_WCHAR : dp->val.wc = *((wchar_t*) ap); break; + default: + NS_ERROR("bad type"); + break; + } + } + *stackBytesToPop = ((uint32_t)ap) - ((uint32_t)args); + + nsresult result = self->mOuter->CallMethod((uint16_t)methodIndex, info, + paramBuffer); + + return result; +} + +} // extern "C" + +static +__attribute__((naked)) +// Compiler-inserted instrumentation is going to botch our assembly below, +// so forbid the compiler from doing that. +__attribute__((no_instrument_function)) +void SharedStub(void) +{ + __asm { + push ebp // set up simple stack frame + mov ebp, esp // stack has: ebp/vtbl_index/retaddr/this/args + push ecx // make room for a ptr + lea eax, [ebp-4] // pointer to stackBytesToPop + push eax + lea eax, [ebp+12] // pointer to args + push eax + push ecx // vtbl_index + mov eax, [ebp+8] // this + push eax + call PrepareAndDispatch + mov edx, [ebp+4] // return address + mov ecx, [ebp-4] // stackBytesToPop + add ecx, 8 // for 'this' and return address + mov esp, ebp + pop ebp + add esp, ecx // fix up stack pointer + jmp edx // simulate __stdcall return + } +} + +// these macros get expanded (many times) in the file #included below +#define STUB_ENTRY(n) \ +__attribute__((naked)) nsresult __stdcall nsXPTCStubBase::Stub##n() \ +{ __asm mov ecx, n __asm jmp SharedStub } + +#define SENTINEL_ENTRY(n) \ +nsresult __stdcall nsXPTCStubBase::Sentinel##n() \ +{ \ + NS_ERROR("nsXPTCStubBase::Sentinel called"); \ + return NS_ERROR_NOT_IMPLEMENTED; \ +} + +#ifdef _MSC_VER +#pragma warning(push) +#pragma warning(disable : 4035) // OK to have no return value +#endif +#include "xptcstubsdef.inc" +#ifdef _MSC_VER +#pragma warning(pop) +#endif + +void +xptc_dummy() +{ +} |