int GetStackSizeForAsmJsUnboxing(ScriptFunction* func)
{
AsmJsFunctionInfo* info = func->GetFunctionBody()->GetAsmJsFunctionInfo();
int argSize = info->GetArgByteSize() + MachPtr;
argSize = ::Math::Align<int32>(argSize, 16);
if (argSize < 32)
{
argSize = 32; // convention is to always allocate spill space for rcx,rdx,r8,r9
}
PROBE_STACK_CALL(func->GetScriptContext(), func, argSize + Js::Constants::MinStackDefault);
return argSize;
}
int GetStackSizeForAsmJsUnboxing(ScriptFunction* func)
{
AsmJsFunctionInfo* info = func->GetFunctionBody()->GetAsmJsFunctionInfo();
int argSize = MachPtr;
for (ArgSlot i = 0; i < info->GetArgCount(); i++)
{
if (info->GetArgType(i).isSIMD())
{
argSize += sizeof(AsmJsSIMDValue);
}
else
{
argSize += MachPtr;
}
}
argSize = ::Math::Align<int32>(argSize, 16);
if (argSize < 32)
{
argSize = 32; // convention is to always allocate spill space for rcx,rdx,r8,r9
}
PROBE_STACK_CALL(func->GetScriptContext(), func, argSize);
return argSize;
}
Var AsmJsExternalEntryPoint(RecyclableObject* entryObject, CallInfo callInfo, ...)
{
ARGUMENTS(args, callInfo);
ScriptFunction* func = (ScriptFunction*)entryObject;
FunctionBody* body = func->GetFunctionBody();
AsmJsFunctionInfo* info = body->GetAsmJsFunctionInfo();
int argSize = info->GetArgByteSize();
void* dst;
Var returnValue = 0;
argSize = ::Math::Align<int32>(argSize, 8);
// Allocate stack space for args
PROBE_STACK_CALL(func->GetScriptContext(), func, argSize + Js::Constants::MinStackDefault);
dst = _alloca(argSize);
const void * asmJSEntryPoint = UnboxAsmJsArguments(func, args.Values + 1, ((char*)dst) - MachPtr, callInfo);
// make call and convert primitive type back to Var
switch (info->GetReturnType().which())
{
case AsmJsRetType::Void:
__asm
{
mov ecx, asmJSEntryPoint
#ifdef _CONTROL_FLOW_GUARD
call[__guard_check_icall_fptr]
#endif
push func
call ecx
}
returnValue = JavascriptOperators::OP_LdUndef(func->GetScriptContext());
break;
case AsmJsRetType::Signed:{
int32 ival = 0;
__asm
{
mov ecx, asmJSEntryPoint
#ifdef _CONTROL_FLOW_GUARD
call[__guard_check_icall_fptr]
#endif
push func
call ecx
mov ival, eax
}
returnValue = JavascriptNumber::ToVar(ival, func->GetScriptContext());
break;
}
case AsmJsRetType::Int64:
{
int32 iLow = 0, iHigh = 0;
__asm
{
mov ecx, asmJSEntryPoint
#ifdef _CONTROL_FLOW_GUARD
call[__guard_check_icall_fptr]
#endif
push func
call ecx
mov iLow, eax;
mov iHigh, edx;
}
#if ENABLE_DEBUG_CONFIG_OPTIONS
if (CONFIG_FLAG(WasmI64))
{
uint64 lHigh = ((uint64)iHigh) << 32;
uint64 lLow = (uint64)(uint32)iLow;
returnValue = CreateI64ReturnObject((int64)(lHigh | lLow), func->GetScriptContext());
break;
}
#endif
JavascriptError::ThrowTypeError(func->GetScriptContext(), WASMERR_InvalidTypeConversion);
}
case AsmJsRetType::Double:{
double dval = 0;
__asm
{
mov ecx, asmJSEntryPoint
#ifdef _CONTROL_FLOW_GUARD
call[__guard_check_icall_fptr]
#endif
push func
call ecx
movsd dval, xmm0
}
returnValue = JavascriptNumber::NewWithCheck(dval, func->GetScriptContext());
break;
}
case AsmJsRetType::Float:{
float fval = 0;
__asm
{
mov ecx, asmJSEntryPoint
#ifdef _CONTROL_FLOW_GUARD
call[__guard_check_icall_fptr]
#endif
push func
call ecx
movss fval, xmm0
}
returnValue = JavascriptNumber::NewWithCheck((double)fval, func->GetScriptContext());
break;
}
#ifdef ENABLE_WASM_SIMD
case AsmJsRetType::Bool32x4:
case AsmJsRetType::Bool16x8:
case AsmJsRetType::Bool8x16:
case AsmJsRetType::Float32x4:
case AsmJsRetType::Float64x2:
case AsmJsRetType::Int64x2:
case AsmJsRetType::Int32x4:
case AsmJsRetType::Int16x8:
case AsmJsRetType::Int8x16:
case AsmJsRetType::Uint32x4:
case AsmJsRetType::Uint16x8:
case AsmJsRetType::Uint8x16:
AsmJsSIMDValue simdVal;
simdVal.Zero();
__asm
{
mov ecx, asmJSEntryPoint
#ifdef _CONTROL_FLOW_GUARD
call[__guard_check_icall_fptr]
#endif
push func
call ecx
movups simdVal, xmm0
}
// Todo:: support test return object (like int64) for wasm.simd
JavascriptError::ThrowTypeError(func->GetScriptContext(), WASMERR_InvalidTypeConversion);
break;
#endif
default:
Assume(UNREACHED);
JavascriptError::ThrowTypeError(func->GetScriptContext(), WASMERR_InvalidTypeConversion);
}
return returnValue;
}