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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ags/shared/script/cc_common.h"
#include "ags/engine/script/runtime_script_value.h"
#include "ags/engine/ac/dynobj/cc_dynamic_object.h"
#include "ags/engine/ac/statobj/static_object.h"
#include "ags/shared/util/memory.h"
namespace AGS3 {
using namespace AGS::Shared;
//
// NOTE to future optimizers: I am using 'this' ptr here to better
// distinguish Runtime Values.
//
// TODO: test again if stack entry really can hold an offset itself
// TODO: use endian-agnostic method to access global vars
uint8_t RuntimeScriptValue::ReadByte() const {
if (this->Type == kScValStackPtr || this->Type == kScValGlobalVar) {
if (RValue->Type == kScValData) {
return *(uint8_t *)(RValue->GetPtrWithOffset() + this->IValue);
} else {
return static_cast<uint8_t>(RValue->IValue);
}
} else if (this->Type == kScValStaticObject || this->Type == kScValStaticArray) {
return this->StcMgr->ReadInt8(this->Ptr, this->IValue);
} else if (this->Type == kScValDynamicObject) {
return this->DynMgr->ReadInt8(this->Ptr, this->IValue);
}
return *((uint8_t *)this->GetPtrWithOffset());
}
int16_t RuntimeScriptValue::ReadInt16() const {
if (this->Type == kScValStackPtr) {
if (RValue->Type == kScValData) {
return *(int16_t *)(RValue->GetPtrWithOffset() + this->IValue);
} else {
return static_cast<uint16_t>(RValue->IValue);
}
} else if (this->Type == kScValGlobalVar) {
if (RValue->Type == kScValData) {
return Memory::ReadInt16LE(RValue->GetPtrWithOffset() + this->IValue);
} else {
return static_cast<uint16_t>(RValue->IValue);
}
} else if (this->Type == kScValStaticObject || this->Type == kScValStaticArray) {
return this->StcMgr->ReadInt16(this->Ptr, this->IValue);
} else if (this->Type == kScValDynamicObject) {
return this->DynMgr->ReadInt16(this->Ptr, this->IValue);
}
return *((int16_t *)this->GetPtrWithOffset());
}
int32_t RuntimeScriptValue::ReadInt32() const {
if (this->Type == kScValStackPtr) {
if (RValue->Type == kScValData) {
return *(int32_t *)(RValue->GetPtrWithOffset() + this->IValue);
} else {
return RValue->IValue; // get RValue as int
}
} else if (this->Type == kScValGlobalVar) {
if (RValue->Type == kScValData) {
return Memory::ReadInt32LE(RValue->GetPtrWithOffset() + this->IValue);
} else {
return RValue->IValue; // get RValue as int
}
} else if (this->Type == kScValStaticObject || this->Type == kScValStaticArray) {
return this->StcMgr->ReadInt32(this->Ptr, this->IValue);
} else if (this->Type == kScValDynamicObject) {
return this->DynMgr->ReadInt32(this->Ptr, this->IValue);
}
return *((int32_t *)this->GetPtrWithOffset());
}
bool RuntimeScriptValue::WriteByte(uint8_t val) {
if (this->Type == kScValStackPtr || this->Type == kScValGlobalVar) {
if (RValue->Type == kScValData) {
*(uint8_t *)(RValue->GetPtrWithOffset() + this->IValue) = val;
} else {
RValue->SetUInt8(val); // set RValue as int
}
} else if (this->Type == kScValStaticObject || this->Type == kScValStaticArray) {
this->StcMgr->WriteInt8(this->Ptr, this->IValue, val);
} else if (this->Type == kScValDynamicObject) {
this->DynMgr->WriteInt8(this->Ptr, this->IValue, val);
} else {
*((uint8_t *)this->GetPtrWithOffset()) = val;
}
return true;
}
bool RuntimeScriptValue::WriteInt16(int16_t val) {
if (this->Type == kScValStackPtr) {
if (RValue->Type == kScValData) {
*(int16_t *)(RValue->GetPtrWithOffset() + this->IValue) = val;
} else {
RValue->SetInt16(val); // set RValue as int
}
} else if (this->Type == kScValGlobalVar) {
if (RValue->Type == kScValData) {
Memory::WriteInt16LE(RValue->GetPtrWithOffset() + this->IValue, val);
} else {
RValue->SetInt16(val); // set RValue as int
}
} else if (this->Type == kScValStaticObject || this->Type == kScValStaticArray) {
this->StcMgr->WriteInt16(this->Ptr, this->IValue, val);
} else if (this->Type == kScValDynamicObject) {
this->DynMgr->WriteInt16(this->Ptr, this->IValue, val);
} else {
*((int16_t *)this->GetPtrWithOffset()) = val;
}
return true;
}
bool RuntimeScriptValue::WriteInt32(int32_t val) {
if (this->Type == kScValStackPtr) {
if (RValue->Type == kScValData) {
*(int32_t *)(RValue->GetPtrWithOffset() + this->IValue) = val;
} else {
RValue->SetInt32(val); // set RValue as int
}
} else if (this->Type == kScValGlobalVar) {
if (RValue->Type == kScValData) {
Memory::WriteInt32LE(RValue->GetPtrWithOffset() + this->IValue, val);
} else {
RValue->SetInt32(val); // set RValue as int
}
} else if (this->Type == kScValStaticObject || this->Type == kScValStaticArray) {
this->StcMgr->WriteInt32(this->Ptr, this->IValue, val);
} else if (this->Type == kScValDynamicObject) {
this->DynMgr->WriteInt32(this->Ptr, this->IValue, val);
} else {
*((int32_t *)this->GetPtrWithOffset()) = val;
}
return true;
}
// Notice, that there are only two valid cases when a pointer may be written:
// when the destination is a stack entry or global variable of free type
// (not kScValData type).
// In any other case, only the numeric value (integer/float) will be written.
bool RuntimeScriptValue::WriteValue(const RuntimeScriptValue &rval) {
if (this->Type == kScValStackPtr) {
if (RValue->Type == kScValData) {
*(int32_t *)(RValue->GetPtrWithOffset() + this->IValue) = rval.IValue;
} else {
// NOTE: we cannot just WriteValue here because when an integer
// is pushed to the stack, script assumes that it is always 4
// bytes and uses that size when calculating offsets to local
// variables;
// Therefore if pushed value is of integer type, we should rather
// act as WriteInt32 (for int8, int16 and int32).
if (rval.Type == kScValInteger) {
RValue->SetInt32(rval.IValue);
} else {
*RValue = rval;
}
}
} else if (this->Type == kScValGlobalVar) {
if (RValue->Type == kScValData) {
Memory::WriteInt32LE(RValue->GetPtrWithOffset() + this->IValue, rval.IValue);
} else {
*RValue = rval;
}
} else if (this->Type == kScValStaticObject || this->Type == kScValStaticArray) {
this->StcMgr->WriteInt32(this->Ptr, this->IValue, rval.IValue);
} else if (this->Type == kScValDynamicObject) {
this->DynMgr->WriteInt32(this->Ptr, this->IValue, rval.IValue);
} else {
*((int32_t *)this->GetPtrWithOffset()) = rval.IValue;
}
return true;
}
RuntimeScriptValue &RuntimeScriptValue::DirectPtr() {
if (Type == kScValGlobalVar || Type == kScValStackPtr) {
int ival = IValue;
*this = *RValue;
IValue += ival;
}
if (Ptr) {
if (Type == kScValDynamicObject)
Ptr = const_cast<char *>(DynMgr->GetFieldPtr(Ptr, IValue));
else if (Type == kScValStaticObject)
Ptr = const_cast<char *>(StcMgr->GetFieldPtr(Ptr, IValue));
else
Ptr += IValue;
IValue = 0;
}
return *this;
}
RuntimeScriptValue &RuntimeScriptValue::DirectPtrObj() {
if (Type == kScValGlobalVar || Type == kScValStackPtr)
*this = *RValue;
return *this;
}
intptr_t RuntimeScriptValue::GetDirectPtr() const {
const RuntimeScriptValue *temp_val = this;
int ival = temp_val->IValue;
if (temp_val->Type == kScValGlobalVar || temp_val->Type == kScValStackPtr) {
temp_val = temp_val->RValue;
ival += temp_val->IValue;
}
if (temp_val->Type == kScValDynamicObject)
return (intptr_t)temp_val->DynMgr->GetFieldPtr(temp_val->Ptr, ival);
else if (temp_val->Type == kScValStaticObject)
return (intptr_t)temp_val->StcMgr->GetFieldPtr(temp_val->Ptr, ival);
else
return (intptr_t)(temp_val->Ptr + ival);
}
} // namespace AGS3
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