mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-30 08:08:39 -05:00
8d353a5b3b
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
564 lines
23 KiB
C++
564 lines
23 KiB
C++
/*
|
|
IASIOThiscallResolver.cpp see the comments in iasiothiscallresolver.h for
|
|
the top level description - this comment describes the technical details of
|
|
the implementation.
|
|
|
|
The latest version of this file is available from:
|
|
http://www.audiomulch.com/~rossb/code/calliasio
|
|
|
|
please email comments to Ross Bencina <rossb@audiomulch.com>
|
|
|
|
BACKGROUND
|
|
|
|
The IASIO interface declared in the Steinberg ASIO 2 SDK declares
|
|
functions with no explicit calling convention. This causes MSVC++ to default
|
|
to using the thiscall convention, which is a proprietary convention not
|
|
implemented by some non-microsoft compilers - notably borland BCC,
|
|
C++Builder, and gcc. MSVC++ is the defacto standard compiler used by
|
|
Steinberg. As a result of this situation, the ASIO sdk will compile with
|
|
any compiler, however attempting to execute the compiled code will cause a
|
|
crash due to different default calling conventions on non-Microsoft
|
|
compilers.
|
|
|
|
IASIOThiscallResolver solves the problem by providing an adapter class that
|
|
delegates to the IASIO interface using the correct calling convention
|
|
(thiscall). Due to the lack of support for thiscall in the Borland and GCC
|
|
compilers, the calls have been implemented in assembly language.
|
|
|
|
A number of macros are defined for thiscall function calls with different
|
|
numbers of parameters, with and without return values - it may be possible
|
|
to modify the format of these macros to make them work with other inline
|
|
assemblers.
|
|
|
|
|
|
THISCALL DEFINITION
|
|
|
|
A number of definitions of the thiscall calling convention are floating
|
|
around the internet. The following definition has been validated against
|
|
output from the MSVC++ compiler:
|
|
|
|
For non-vararg functions, thiscall works as follows: the object (this)
|
|
pointer is passed in ECX. All arguments are passed on the stack in
|
|
right to left order. The return value is placed in EAX. The callee
|
|
clears the passed arguments from the stack.
|
|
|
|
|
|
FINDING FUNCTION POINTERS FROM AN IASIO POINTER
|
|
|
|
The first field of a COM object is a pointer to its vtble. Thus a pointer
|
|
to an object implementing the IASIO interface also points to a pointer to
|
|
that object's vtbl. The vtble is a table of function pointers for all of
|
|
the virtual functions exposed by the implemented interfaces.
|
|
|
|
If we consider a variable declared as a pointer to IASO:
|
|
|
|
IASIO *theAsioDriver
|
|
|
|
theAsioDriver points to:
|
|
|
|
object implementing IASIO
|
|
{
|
|
IASIOvtbl *vtbl
|
|
other data
|
|
}
|
|
|
|
in other words, theAsioDriver points to a pointer to an IASIOvtbl
|
|
|
|
vtbl points to a table of function pointers:
|
|
|
|
IASIOvtbl ( interface IASIO : public IUnknown )
|
|
{
|
|
(IUnknown functions)
|
|
0 virtual HRESULT STDMETHODCALLTYPE (*QueryInterface)(REFIID riid, void **ppv) = 0;
|
|
4 virtual ULONG STDMETHODCALLTYPE (*AddRef)() = 0;
|
|
8 virtual ULONG STDMETHODCALLTYPE (*Release)() = 0;
|
|
|
|
(IASIO functions)
|
|
12 virtual ASIOBool (*init)(void *sysHandle) = 0;
|
|
16 virtual void (*getDriverName)(char *name) = 0;
|
|
20 virtual long (*getDriverVersion)() = 0;
|
|
24 virtual void (*getErrorMessage)(char *string) = 0;
|
|
28 virtual ASIOError (*start)() = 0;
|
|
32 virtual ASIOError (*stop)() = 0;
|
|
36 virtual ASIOError (*getChannels)(long *numInputChannels, long *numOutputChannels) = 0;
|
|
40 virtual ASIOError (*getLatencies)(long *inputLatency, long *outputLatency) = 0;
|
|
44 virtual ASIOError (*getBufferSize)(long *minSize, long *maxSize,
|
|
long *preferredSize, long *granularity) = 0;
|
|
48 virtual ASIOError (*canSampleRate)(ASIOSampleRate sampleRate) = 0;
|
|
52 virtual ASIOError (*getSampleRate)(ASIOSampleRate *sampleRate) = 0;
|
|
56 virtual ASIOError (*setSampleRate)(ASIOSampleRate sampleRate) = 0;
|
|
60 virtual ASIOError (*getClockSources)(ASIOClockSource *clocks, long *numSources) = 0;
|
|
64 virtual ASIOError (*setClockSource)(long reference) = 0;
|
|
68 virtual ASIOError (*getSamplePosition)(ASIOSamples *sPos, ASIOTimeStamp *tStamp) = 0;
|
|
72 virtual ASIOError (*getChannelInfo)(ASIOChannelInfo *info) = 0;
|
|
76 virtual ASIOError (*createBuffers)(ASIOBufferInfo *bufferInfos, long numChannels,
|
|
long bufferSize, ASIOCallbacks *callbacks) = 0;
|
|
80 virtual ASIOError (*disposeBuffers)() = 0;
|
|
84 virtual ASIOError (*controlPanel)() = 0;
|
|
88 virtual ASIOError (*future)(long selector,void *opt) = 0;
|
|
92 virtual ASIOError (*outputReady)() = 0;
|
|
};
|
|
|
|
The numbers in the left column show the byte offset of each function ptr
|
|
from the beginning of the vtbl. These numbers are used in the code below
|
|
to select different functions.
|
|
|
|
In order to find the address of a particular function, theAsioDriver
|
|
must first be dereferenced to find the value of the vtbl pointer:
|
|
|
|
mov eax, theAsioDriver
|
|
mov edx, [theAsioDriver] // edx now points to vtbl[0]
|
|
|
|
Then an offset must be added to the vtbl pointer to select a
|
|
particular function, for example vtbl+44 points to the slot containing
|
|
a pointer to the getBufferSize function.
|
|
|
|
Finally vtbl+x must be dereferenced to obtain the value of the function
|
|
pointer stored in that address:
|
|
|
|
call [edx+44] // call the function pointed to by
|
|
// the value in the getBufferSize field of the vtbl
|
|
|
|
|
|
SEE ALSO
|
|
|
|
Martin Fay's OpenASIO DLL at http://www.martinfay.com solves the same
|
|
problem by providing a new COM interface which wraps IASIO with an
|
|
interface that uses portable calling conventions. OpenASIO must be compiled
|
|
with MSVC, and requires that you ship the OpenASIO DLL with your
|
|
application.
|
|
|
|
|
|
ACKNOWLEDGEMENTS
|
|
|
|
Ross Bencina: worked out the thiscall details above, wrote the original
|
|
Borland asm macros, and a patch for asio.cpp (which is no longer needed).
|
|
Thanks to Martin Fay for introducing me to the issues discussed here,
|
|
and to Rene G. Ceballos for assisting with asm dumps from MSVC++.
|
|
|
|
Antti Silvast: converted the original calliasio to work with gcc and NASM
|
|
by implementing the asm code in a separate file.
|
|
|
|
Fraser Adams: modified the original calliasio containing the Borland inline
|
|
asm to add inline asm for gcc i.e. Intel syntax for Borland and AT&T syntax
|
|
for gcc. This seems a neater approach for gcc than to have a separate .asm
|
|
file and it means that we only need one version of the thiscall patch.
|
|
|
|
Fraser Adams: rewrote the original calliasio patch in the form of the
|
|
IASIOThiscallResolver class in order to avoid modifications to files from
|
|
the Steinberg SDK, which may have had potential licence issues.
|
|
|
|
Andrew Baldwin: contributed fixes for compatibility problems with more
|
|
recent versions of the gcc assembler.
|
|
*/
|
|
|
|
|
|
// We only need IASIOThiscallResolver at all if we are on Win32. For other
|
|
// platforms we simply bypass the IASIOThiscallResolver definition to allow us
|
|
// to be safely #include'd whatever the platform to keep client code portable
|
|
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
|
|
|
|
|
|
// If microsoft compiler we can call IASIO directly so IASIOThiscallResolver
|
|
// is not used.
|
|
#if !defined(_MSC_VER)
|
|
|
|
|
|
#include <new>
|
|
#include <assert.h>
|
|
|
|
// We have a mechanism in iasiothiscallresolver.h to ensure that asio.h is
|
|
// #include'd before it in client code, we do NOT want to do this test here.
|
|
#define iasiothiscallresolver_sourcefile 1
|
|
#include "iasiothiscallresolver.h"
|
|
#undef iasiothiscallresolver_sourcefile
|
|
|
|
// iasiothiscallresolver.h redefines ASIOInit for clients, but we don't want
|
|
// this macro defined in this translation unit.
|
|
#undef ASIOInit
|
|
|
|
|
|
// theAsioDriver is a global pointer to the current IASIO instance which the
|
|
// ASIO SDK uses to perform all actions on the IASIO interface. We substitute
|
|
// our own forwarding interface into this pointer.
|
|
extern IASIO* theAsioDriver;
|
|
|
|
|
|
// The following macros define the inline assembler for BORLAND first then gcc
|
|
|
|
#if defined(__BCPLUSPLUS__) || defined(__BORLANDC__)
|
|
|
|
|
|
#define CALL_THISCALL_0( resultName, thisPtr, funcOffset )\
|
|
void *this_ = (thisPtr); \
|
|
__asm { \
|
|
mov ecx, this_ ; \
|
|
mov eax, [ecx] ; \
|
|
call [eax+funcOffset] ; \
|
|
mov resultName, eax ; \
|
|
}
|
|
|
|
|
|
#define CALL_VOID_THISCALL_1( thisPtr, funcOffset, param1 )\
|
|
void *this_ = (thisPtr); \
|
|
__asm { \
|
|
mov eax, param1 ; \
|
|
push eax ; \
|
|
mov ecx, this_ ; \
|
|
mov eax, [ecx] ; \
|
|
call [eax+funcOffset] ; \
|
|
}
|
|
|
|
|
|
#define CALL_THISCALL_1( resultName, thisPtr, funcOffset, param1 )\
|
|
void *this_ = (thisPtr); \
|
|
__asm { \
|
|
mov eax, param1 ; \
|
|
push eax ; \
|
|
mov ecx, this_ ; \
|
|
mov eax, [ecx] ; \
|
|
call [eax+funcOffset] ; \
|
|
mov resultName, eax ; \
|
|
}
|
|
|
|
|
|
#define CALL_THISCALL_1_DOUBLE( resultName, thisPtr, funcOffset, param1 )\
|
|
void *this_ = (thisPtr); \
|
|
void *doubleParamPtr_ (¶m1); \
|
|
__asm { \
|
|
mov eax, doubleParamPtr_ ; \
|
|
push [eax+4] ; \
|
|
push [eax] ; \
|
|
mov ecx, this_ ; \
|
|
mov eax, [ecx] ; \
|
|
call [eax+funcOffset] ; \
|
|
mov resultName, eax ; \
|
|
}
|
|
|
|
|
|
#define CALL_THISCALL_2( resultName, thisPtr, funcOffset, param1, param2 )\
|
|
void *this_ = (thisPtr); \
|
|
__asm { \
|
|
mov eax, param2 ; \
|
|
push eax ; \
|
|
mov eax, param1 ; \
|
|
push eax ; \
|
|
mov ecx, this_ ; \
|
|
mov eax, [ecx] ; \
|
|
call [eax+funcOffset] ; \
|
|
mov resultName, eax ; \
|
|
}
|
|
|
|
|
|
#define CALL_THISCALL_4( resultName, thisPtr, funcOffset, param1, param2, param3, param4 )\
|
|
void *this_ = (thisPtr); \
|
|
__asm { \
|
|
mov eax, param4 ; \
|
|
push eax ; \
|
|
mov eax, param3 ; \
|
|
push eax ; \
|
|
mov eax, param2 ; \
|
|
push eax ; \
|
|
mov eax, param1 ; \
|
|
push eax ; \
|
|
mov ecx, this_ ; \
|
|
mov eax, [ecx] ; \
|
|
call [eax+funcOffset] ; \
|
|
mov resultName, eax ; \
|
|
}
|
|
|
|
|
|
#elif defined(__GNUC__)
|
|
|
|
|
|
#define CALL_THISCALL_0( resultName, thisPtr, funcOffset ) \
|
|
__asm__ __volatile__ ("movl (%1), %%edx\n\t" \
|
|
"call *"#funcOffset"(%%edx)\n\t" \
|
|
:"=a"(resultName) /* Output Operands */ \
|
|
:"c"(thisPtr) /* Input Operands */ \
|
|
); \
|
|
|
|
|
|
#define CALL_VOID_THISCALL_1( thisPtr, funcOffset, param1 ) \
|
|
__asm__ __volatile__ ("pushl %0\n\t" \
|
|
"movl (%1), %%edx\n\t" \
|
|
"call *"#funcOffset"(%%edx)\n\t" \
|
|
: /* Output Operands */ \
|
|
:"r"(param1), /* Input Operands */ \
|
|
"c"(thisPtr) \
|
|
); \
|
|
|
|
|
|
#define CALL_THISCALL_1( resultName, thisPtr, funcOffset, param1 ) \
|
|
__asm__ __volatile__ ("pushl %1\n\t" \
|
|
"movl (%2), %%edx\n\t" \
|
|
"call *"#funcOffset"(%%edx)\n\t" \
|
|
:"=a"(resultName) /* Output Operands */ \
|
|
:"r"(param1), /* Input Operands */ \
|
|
"c"(thisPtr) \
|
|
); \
|
|
|
|
|
|
#define CALL_THISCALL_1_DOUBLE( resultName, thisPtr, funcOffset, param1 ) \
|
|
__asm__ __volatile__ ("pushl 4(%1)\n\t" \
|
|
"pushl (%1)\n\t" \
|
|
"movl (%2), %%edx\n\t" \
|
|
"call *"#funcOffset"(%%edx);\n\t" \
|
|
:"=a"(resultName) /* Output Operands */ \
|
|
:"a"(¶m1), /* Input Operands */ \
|
|
/* Note: Using "r" above instead of "a" fails */ \
|
|
/* when using GCC 3.3.3, and maybe later versions*/\
|
|
"c"(thisPtr) \
|
|
); \
|
|
|
|
|
|
#define CALL_THISCALL_2( resultName, thisPtr, funcOffset, param1, param2 ) \
|
|
__asm__ __volatile__ ("pushl %1\n\t" \
|
|
"pushl %2\n\t" \
|
|
"movl (%3), %%edx\n\t" \
|
|
"call *"#funcOffset"(%%edx)\n\t" \
|
|
:"=a"(resultName) /* Output Operands */ \
|
|
:"r"(param2), /* Input Operands */ \
|
|
"r"(param1), \
|
|
"c"(thisPtr) \
|
|
); \
|
|
|
|
|
|
#define CALL_THISCALL_4( resultName, thisPtr, funcOffset, param1, param2, param3, param4 )\
|
|
__asm__ __volatile__ ("pushl %1\n\t" \
|
|
"pushl %2\n\t" \
|
|
"pushl %3\n\t" \
|
|
"pushl %4\n\t" \
|
|
"movl (%5), %%edx\n\t" \
|
|
"call *"#funcOffset"(%%edx)\n\t" \
|
|
:"=a"(resultName) /* Output Operands */ \
|
|
:"r"(param4), /* Input Operands */ \
|
|
"r"(param3), \
|
|
"r"(param2), \
|
|
"r"(param1), \
|
|
"c"(thisPtr) \
|
|
); \
|
|
|
|
#endif
|
|
|
|
|
|
|
|
// Our static singleton instance.
|
|
IASIOThiscallResolver IASIOThiscallResolver::instance;
|
|
|
|
// Constructor called to initialize static Singleton instance above. Note that
|
|
// it is important not to clear that_ incase it has already been set by the call
|
|
// to placement new in ASIOInit().
|
|
IASIOThiscallResolver::IASIOThiscallResolver()
|
|
{
|
|
}
|
|
|
|
// Constructor called from ASIOInit() below
|
|
IASIOThiscallResolver::IASIOThiscallResolver(IASIO* that)
|
|
: that_( that )
|
|
{
|
|
}
|
|
|
|
// Implement IUnknown methods as assert(false). IASIOThiscallResolver is not
|
|
// really a COM object, just a wrapper which will work with the ASIO SDK.
|
|
// If you wanted to use ASIO without the SDK you might want to implement COM
|
|
// aggregation in these methods.
|
|
HRESULT STDMETHODCALLTYPE IASIOThiscallResolver::QueryInterface(REFIID riid, void **ppv)
|
|
{
|
|
(void)riid; // suppress unused variable warning
|
|
|
|
assert( false ); // this function should never be called by the ASIO SDK.
|
|
|
|
*ppv = NULL;
|
|
return E_NOINTERFACE;
|
|
}
|
|
|
|
ULONG STDMETHODCALLTYPE IASIOThiscallResolver::AddRef()
|
|
{
|
|
assert( false ); // this function should never be called by the ASIO SDK.
|
|
|
|
return 1;
|
|
}
|
|
|
|
ULONG STDMETHODCALLTYPE IASIOThiscallResolver::Release()
|
|
{
|
|
assert( false ); // this function should never be called by the ASIO SDK.
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
// Implement the IASIO interface methods by performing the vptr manipulation
|
|
// described above then delegating to the real implementation.
|
|
ASIOBool IASIOThiscallResolver::init(void *sysHandle)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_1( result, that_, 12, sysHandle );
|
|
return result;
|
|
}
|
|
|
|
void IASIOThiscallResolver::getDriverName(char *name)
|
|
{
|
|
CALL_VOID_THISCALL_1( that_, 16, name );
|
|
}
|
|
|
|
long IASIOThiscallResolver::getDriverVersion()
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_0( result, that_, 20 );
|
|
return result;
|
|
}
|
|
|
|
void IASIOThiscallResolver::getErrorMessage(char *string)
|
|
{
|
|
CALL_VOID_THISCALL_1( that_, 24, string );
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::start()
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_0( result, that_, 28 );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::stop()
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_0( result, that_, 32 );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::getChannels(long *numInputChannels, long *numOutputChannels)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_2( result, that_, 36, numInputChannels, numOutputChannels );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::getLatencies(long *inputLatency, long *outputLatency)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_2( result, that_, 40, inputLatency, outputLatency );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::getBufferSize(long *minSize, long *maxSize,
|
|
long *preferredSize, long *granularity)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_4( result, that_, 44, minSize, maxSize, preferredSize, granularity );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::canSampleRate(ASIOSampleRate sampleRate)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_1_DOUBLE( result, that_, 48, sampleRate );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::getSampleRate(ASIOSampleRate *sampleRate)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_1( result, that_, 52, sampleRate );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::setSampleRate(ASIOSampleRate sampleRate)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_1_DOUBLE( result, that_, 56, sampleRate );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::getClockSources(ASIOClockSource *clocks, long *numSources)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_2( result, that_, 60, clocks, numSources );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::setClockSource(long reference)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_1( result, that_, 64, reference );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::getSamplePosition(ASIOSamples *sPos, ASIOTimeStamp *tStamp)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_2( result, that_, 68, sPos, tStamp );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::getChannelInfo(ASIOChannelInfo *info)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_1( result, that_, 72, info );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::createBuffers(ASIOBufferInfo *bufferInfos,
|
|
long numChannels, long bufferSize, ASIOCallbacks *callbacks)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_4( result, that_, 76, bufferInfos, numChannels, bufferSize, callbacks );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::disposeBuffers()
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_0( result, that_, 80 );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::controlPanel()
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_0( result, that_, 84 );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::future(long selector,void *opt)
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_2( result, that_, 88, selector, opt );
|
|
return result;
|
|
}
|
|
|
|
ASIOError IASIOThiscallResolver::outputReady()
|
|
{
|
|
ASIOBool result;
|
|
CALL_THISCALL_0( result, that_, 92 );
|
|
return result;
|
|
}
|
|
|
|
|
|
// Implement our substitute ASIOInit() method
|
|
ASIOError IASIOThiscallResolver::ASIOInit(ASIODriverInfo *info)
|
|
{
|
|
// To ensure that our instance's vptr is correctly constructed, even if
|
|
// ASIOInit is called prior to main(), we explicitly call its constructor
|
|
// (potentially over the top of an existing instance). Note that this is
|
|
// pretty ugly, and is only safe because IASIOThiscallResolver has no
|
|
// destructor and contains no objects with destructors.
|
|
new((void*)&instance) IASIOThiscallResolver( theAsioDriver );
|
|
|
|
// Interpose between ASIO client code and the real driver.
|
|
theAsioDriver = &instance;
|
|
|
|
// Note that we never need to switch theAsioDriver back to point to the
|
|
// real driver because theAsioDriver is reset to zero in ASIOExit().
|
|
|
|
// Delegate to the real ASIOInit
|
|
return ::ASIOInit(info);
|
|
}
|
|
|
|
|
|
#endif /* !defined(_MSC_VER) */
|
|
|
|
#endif /* Win32 */
|
|
|