1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* -*- 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"
#include "xptiprivate.h"
#ifndef WIN32
#error "This code is for Win32 only"
#endif
extern "C" {
#if !defined(__GNUC__) && !defined(__clang__)
static
#endif
nsresult __stdcall
PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex,
uint32_t* args, uint32_t* stackBytesToPop)
{
#define PARAM_BUFFER_COUNT 16
nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
nsXPTCMiniVariant* dispatchParams = nullptr;
const nsXPTMethodInfo* info = nullptr;
uint8_t paramCount;
uint8_t i;
nsresult result = NS_ERROR_FAILURE;
// 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();
// setup variant array pointer
if(paramCount > PARAM_BUFFER_COUNT)
dispatchParams = new nsXPTCMiniVariant[paramCount];
else
dispatchParams = paramBuffer;
NS_ASSERTION(dispatchParams,"no place for params");
uint32_t* ap = args;
for(i = 0; i < paramCount; i++, ap++)
{
const nsXPTParamInfo& param = info->GetParam(i);
const nsXPTType& type = param.GetType();
nsXPTCMiniVariant* dp = &dispatchParams[i];
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);
result = self->mOuter->CallMethod((uint16_t)methodIndex, info, dispatchParams);
if(dispatchParams != paramBuffer)
delete [] dispatchParams;
return result;
}
} // extern "C"
// declspec(naked) is broken in gcc and clang-cl
#if !defined(__GNUC__) && !defined(__clang__)
static
__declspec(naked)
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) \
__declspec(naked) nsresult __stdcall nsXPTCStubBase::Stub##n() \
{ __asm mov ecx, n __asm jmp SharedStub }
#else
asm(".text\n\t"
".align 4\n\t"
"SharedStub:\n\t"
"push %ebp\n\t"
"mov %esp, %ebp\n\t"
"push %ecx\n\t"
"lea -4(%ebp), %eax\n\t"
"push %eax\n\t"
"lea 12(%ebp), %eax\n\t"
"push %eax\n\t"
"push %ecx\n\t"
"movl 8(%ebp), %eax\n\t"
"push %eax\n\t"
"call _PrepareAndDispatch@16\n\t"
"mov 4(%ebp), %edx\n\t"
"mov -4(%ebp), %ecx\n\t"
"add $8, %ecx\n\t"
"mov %ebp, %esp\n\t"
"pop %ebp\n\t"
"add %ecx, %esp\n\t"
"jmp *%edx"
);
// The clang-cl specific code below is required because mingw uses the gcc name
// mangling, but clang-cl implements the MSVC name mangling.
#ifdef __clang__
#define STUB_ENTRY(n) \
asm(".text\n\t" \
".align 4\n\t" \
".globl \"?Stub" #n "@nsXPTCStubBase@@UAG?AW4nsresult@@XZ\"\n\t" \
".def \"?Stub" #n "@nsXPTCStubBase@@UAG?AW4nsresult@@XZ\"; \n\t" \
".scl 2\n\t" \
".type 46\n\t" \
".endef\n\t" \
"\"?Stub" #n "@nsXPTCStubBase@@UAG?AW4nsresult@@XZ\":\n\t" \
"mov $" #n ", %ecx\n\t" \
"jmp SharedStub");
#else
#define STUB_ENTRY(n) \
asm(".text\n\t" \
".align 4\n\t" \
".if " #n " < 10\n\t" \
".globl __ZN14nsXPTCStubBase5Stub" #n "Ev@4\n\t" \
".def __ZN14nsXPTCStubBase5Stub" #n "Ev@4; \n\t" \
".scl 3\n\t" \
".type 46\n\t" \
".endef\n\t" \
"__ZN14nsXPTCStubBase5Stub" #n "Ev@4:\n\t" \
".elseif " #n " < 100\n\t" \
".globl __ZN14nsXPTCStubBase6Stub" #n "Ev@4\n\t" \
".def __ZN14nsXPTCStubBase6Stub" #n "Ev@4\n\t" \
".scl 3\n\t" \
".type 46\n\t" \
".endef\n\t" \
"__ZN14nsXPTCStubBase6Stub" #n "Ev@4:\n\t" \
".elseif " #n " < 1000\n\t" \
".globl __ZN14nsXPTCStubBase7Stub" #n "Ev@4\n\t" \
".def __ZN14nsXPTCStubBase7Stub" #n "Ev@4\n\t" \
".scl 3\n\t" \
".type 46\n\t" \
".endef\n\t" \
"__ZN14nsXPTCStubBase7Stub" #n "Ev@4:\n\t" \
".else\n\t" \
".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \
".endif\n\t" \
"mov $" #n ", %ecx\n\t" \
"jmp SharedStub");
#endif
#endif /* __GNUC__ || __clang__ */
#define SENTINEL_ENTRY(n) \
nsresult __stdcall nsXPTCStubBase::Sentinel##n() \
{ \
NS_ERROR("nsXPTCStubBase::Sentinel called"); \
return NS_ERROR_NOT_IMPLEMENTED; \
}
#ifdef _MSC_VER
#pragma warning(disable : 4035) // OK to have no return value
#endif
#include "xptcstubsdef.inc"
#ifdef _MSC_VER
#pragma warning(default : 4035) // restore default
#endif
void
#ifdef __GNUC__
__cdecl
#endif
xptc_dummy()
{
}
|
