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// platform.cpp
#include "platform.h"
#include "common.h"
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include <Windows.h>
#undef WIN32_LEAN_AND_MEAN
#undef NOMINMAX
#else
#include "slang-string.h"
#include <dlfcn.h>
#endif
namespace Slang
{
// SharedLibrary
/* static */SlangResult SharedLibrary::load(const char* filename, SharedLibrary::Handle& handleOut)
{
StringBuilder builder;
appendPlatformFileName(UnownedStringSlice(filename), builder);
return loadWithPlatformFilename(builder.begin(), handleOut);
}
#ifdef _WIN32
/* static */SlangResult SharedLibrary::loadWithPlatformFilename(char const* platformFileName, SharedLibrary::Handle& handleOut)
{
handleOut = nullptr;
// https://docs.microsoft.com/en-us/windows/desktop/api/libloaderapi/nf-libloaderapi-loadlibrarya
const HMODULE h = LoadLibraryA(platformFileName);
if (!h)
{
const DWORD lastError = GetLastError();
switch (lastError)
{
case ERROR_MOD_NOT_FOUND:
case ERROR_PATH_NOT_FOUND:
case ERROR_FILE_NOT_FOUND:
{
return SLANG_E_NOT_FOUND;
}
case ERROR_INVALID_ACCESS:
case ERROR_ACCESS_DENIED:
case ERROR_INVALID_DATA:
{
return SLANG_E_CANNOT_OPEN;
}
default: break;
}
// Turn to Result, if not one of the well known errors
return HRESULT_FROM_WIN32(lastError);
}
handleOut = (Handle)h;
return SLANG_OK;
}
/* static */void SharedLibrary::unload(Handle handle)
{
SLANG_ASSERT(handle);
::FreeLibrary((HMODULE)handle);
}
/* static */SharedLibrary::FuncPtr SharedLibrary::findFuncByName(Handle handle, char const* name)
{
SLANG_ASSERT(handle);
return (FuncPtr)GetProcAddress((HMODULE)handle, name);
}
/* static */void SharedLibrary::appendPlatformFileName(const UnownedStringSlice& name, StringBuilder& dst)
{
// Windows doesn't need the extension or any prefix to work
dst.Append(name);
}
#else // _WIN32
/* static */SlangResult SharedLibrary::loadWithPlatformFilename(char const* platformFileName, Handle& handleOut)
{
handleOut = nullptr;
void* h = dlopen(platformFileName, RTLD_NOW | RTLD_LOCAL);
if(!h)
{
#if 0
// We can't output the error message here, because it will cause output when testing what code gen is available
if(auto msg = dlerror())
{
fprintf(stderr, "error: %s\n", msg);
}
#endif
return SLANG_FAIL;
}
handleOut = (Handle)h;
return SLANG_OK;
}
/* static */void SharedLibrary::unload(Handle handle)
{
SLANG_ASSERT(handle);
dlclose(handle);
}
/* static */SharedLibrary::FuncPtr SharedLibrary::findFuncByName(Handle handle, char const* name)
{
SLANG_ASSERT(handle);
return (FuncPtr)dlsym((void*)handle, name);
}
/* static */void SharedLibrary::appendPlatformFileName(const UnownedStringSlice& name, StringBuilder& dst)
{
dst.Append("lib");
dst.Append(name);
dst.Append(".so");
}
#endif // _WIN32
}
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