diff options
Diffstat (limited to 'xpcom/reflect/xptcall/md/test/invoke_test.cpp')
| -rw-r--r-- | xpcom/reflect/xptcall/md/test/invoke_test.cpp | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/test/invoke_test.cpp b/xpcom/reflect/xptcall/md/test/invoke_test.cpp new file mode 100644 index 0000000000..f23a9ccf15 --- /dev/null +++ b/xpcom/reflect/xptcall/md/test/invoke_test.cpp @@ -0,0 +1,187 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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/. */ + +#include <stdio.h> + +typedef unsigned nsresult; +typedef unsigned uint32_t; +typedef unsigned nsXPCVariant; + +#if defined(WIN32) +# define NS_IMETHOD virtual nsresult __stdcall +# define NS_IMETHODIMP nsresult __stdcall +#else +# define NS_IMETHOD virtual nsresult +# define NS_IMETHODIMP nsresult +#endif + +class base { + public: + NS_IMETHOD ignored() = 0; +}; + +class foo : public base { + public: + NS_IMETHOD callme1(int i, int j) = 0; + NS_IMETHOD callme2(int i, int j) = 0; + NS_IMETHOD callme3(int i, int j) = 0; +}; + +class bar : public foo { + public: + NS_IMETHOD ignored() override; + NS_IMETHOD callme1(int i, int j) override; + NS_IMETHOD callme2(int i, int j) override; + NS_IMETHOD callme3(int i, int j) override; +}; + +/* +class baz : public base { +public: + NS_IMETHOD ignored() override; + NS_IMETHOD callme1() override; + NS_IMETHOD callme2() override; + NS_IMETHOD callme3() override; + void setfoo(foo* f) {other = f;} + + foo* other; +}; +NS_IMETHODIMP baz::ignored(){return 0;} +*/ + +NS_IMETHODIMP bar::ignored() { return 0; } + +NS_IMETHODIMP bar::callme1(int i, int j) { + printf("called bar::callme1 with: %d %d\n", i, j); + return 5; +} + +NS_IMETHODIMP bar::callme2(int i, int j) { + printf("called bar::callme2 with: %d %d\n", i, j); + return 5; +} + +NS_IMETHODIMP bar::callme3(int i, int j) { + printf("called bar::callme3 with: %d %d\n", i, j); + return 5; +} + +void docall(foo* f, int i, int j) { f->callme1(i, j); } + +/***************************************************************************/ +#if defined(WIN32) + +static uint32_t __stdcall invoke_count_words(uint32_t paramCount, + nsXPCVariant* s) { + return paramCount; +} + +static void __stdcall invoke_copy_to_stack(uint32_t* d, uint32_t paramCount, + nsXPCVariant* s) { + for (uint32_t i = 0; i < paramCount; i++, d++, s++) { + *((uint32_t*)d) = *((uint32_t*)s); + } +} + +static nsresult __stdcall DoInvoke(void* that, uint32_t index, + uint32_t paramCount, nsXPCVariant* params) { + __asm { + push params + push paramCount + call invoke_count_words // stdcall, result in eax + shl eax,2 // *= 4 + sub esp,eax // make space for params + mov edx,esp + push params + push paramCount + push edx + call invoke_copy_to_stack // stdcall + mov ecx,that // instance in ecx + push ecx // push this + mov edx,[ecx] // vtable in edx + mov eax,index + shl eax,2 // *= 4 + add edx,eax + call [edx] // stdcall, i.e. callee cleans up stack. + } +} + +#else +/***************************************************************************/ +// just Linux_x86 now. Add other later... + +static uint32_t invoke_count_words(uint32_t paramCount, nsXPCVariant* s) { + return paramCount; +} + +static void invoke_copy_to_stack(uint32_t* d, uint32_t paramCount, + nsXPCVariant* s) { + for (uint32_t i = 0; i < paramCount; i++, d++, s++) { + *((uint32_t*)d) = *((uint32_t*)s); + } +} + +static nsresult DoInvoke(void* that, uint32_t index, uint32_t paramCount, + nsXPCVariant* params) { + uint32_t result; + void* fn_count = invoke_count_words; + void* fn_copy = invoke_copy_to_stack; + + __asm__ __volatile__( + "pushl %4\n\t" + "pushl %3\n\t" + "movl %5, %%eax\n\t" + "call *%%eax\n\t" /* count words */ + "addl $0x8, %%esp\n\t" + "shl $2, %%eax\n\t" /* *= 4 */ + "subl %%eax, %%esp\n\t" /* make room for params */ + "movl %%esp, %%edx\n\t" + "pushl %4\n\t" + "pushl %3\n\t" + "pushl %%edx\n\t" + "movl %6, %%eax\n\t" + "call *%%eax\n\t" /* copy params */ + "addl $0xc, %%esp\n\t" + "movl %1, %%ecx\n\t" + "pushl %%ecx\n\t" + "movl (%%ecx), %%edx\n\t" + "movl %2, %%eax\n\t" /* function index */ + "shl $2, %%eax\n\t" /* *= 4 */ + "addl $8, %%eax\n\t" /* += 8 */ + "addl %%eax, %%edx\n\t" + "call *(%%edx)\n\t" /* safe to not cleanup esp */ + "movl %%eax, %0" + : "=g"(result) /* %0 */ + : "g"(that), /* %1 */ + "g"(index), /* %2 */ + "g"(paramCount), /* %3 */ + "g"(params), /* %4 */ + "g"(fn_count), /* %5 */ + "g"(fn_copy) /* %6 */ + : "ax", "cx", "dx", "memory"); + + return result; +} + +#endif +/***************************************************************************/ + +int main() { + nsXPCVariant params1[2] = {1, 2}; + nsXPCVariant params2[2] = {2, 4}; + nsXPCVariant params3[2] = {3, 6}; + + foo* a = new bar(); + + // printf("calling via C++...\n"); + // docall(a, 12, 24); + + printf("calling via ASM...\n"); + DoInvoke(a, 1, 2, params1); + DoInvoke(a, 2, 2, params2); + DoInvoke(a, 3, 2, params3); + + return 0; +} |