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Refactor to allow peek/poke/reference to share a common implementation as much as possible.

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Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon 2017-08-24 11:28:01 +01:00
parent 19c0b93262
commit 9964070b85
4 changed files with 18 additions and 32 deletions
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7
LR35902/inc/Bus.h
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@ -182,11 +182,6 @@ namespace EightBit {
void loadBootRom(const std::string& path);
void loadGameRom(const std::string& path);
virtual uint8_t peek(uint16_t address);
virtual void poke(uint16_t address, uint8_t value);
virtual uint8_t& reference();
private:
std::vector<uint8_t> m_bootRom;
std::vector<uint8_t> m_gameRom;
@ -214,6 +209,6 @@ namespace EightBit {
void validateCartridgeType();
uint8_t& reference(uint16_t address, bool& rom);
virtual uint8_t& reference(uint16_t address, bool& rom);
};
}

18
LR35902/src/Bus.cpp
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@ -53,22 +53,6 @@ uint8_t& EightBit::Bus::reference(uint16_t address, bool& rom) {
return m_bus[effective];
}
uint8_t& EightBit::Bus::reference() {
bool rom;
auto& value = reference(ADDRESS().word, rom);
return rom ? placeDATA(value) : referenceDATA(value);
}
uint8_t EightBit::Bus::peek(uint16_t address) {
bool rom;
return reference(address, rom);
}
void EightBit::Bus::poke(uint16_t address, uint8_t value) {
bool rom;
reference(address, rom) = value;
}
void EightBit::Bus::Bus_WrittenByte(const AddressEventArgs& e) {
const auto address = e.getAddress();
@ -90,7 +74,7 @@ void EightBit::Bus::Bus_WrittenByte(const AddressEventArgs& e) {
m_disableBootRom = value != 0;
break;
case BASE + DIV:
reference() = 0;
Memory::reference() = 0;
m_timerCounter = 0;
break;
}

19
inc/Memory.h
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@ -31,7 +31,6 @@ namespace EightBit {
class Memory {
public:
Memory(uint16_t addressMask);
virtual ~Memory();
@ -53,10 +52,10 @@ namespace EightBit {
return DATA();
}
virtual uint8_t peek(uint16_t address);
virtual void poke(uint16_t address, uint8_t value);
uint8_t peek(uint16_t address);
void poke(uint16_t address, uint8_t value);
virtual uint16_t peekWord(uint16_t address);
uint16_t peekWord(uint16_t address);
virtual int effectiveAddress(int address) const {
return address & m_addressMask;
@ -120,9 +119,15 @@ namespace EightBit {
WrittenByte.fire(AddressEventArgs(ADDRESS().word, DATA()));
}
virtual uint8_t& reference() {
auto effective = effectiveAddress(ADDRESS().word);
return m_locked[effective] ? placeDATA(m_bus[effective]) : referenceDATA(m_bus[effective]);
virtual uint8_t& reference(uint16_t address, bool& rom) {
rom = m_locked[address];
return m_bus[address];
}
uint8_t& reference() {
bool rom;
auto& value = reference(ADDRESS().word, rom);
return rom ? placeDATA(value) : referenceDATA(value);
}
int loadMemory(const std::string& path, uint16_t offset);

6
src/Memory.cpp
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@ -20,11 +20,13 @@ EightBit::Memory::~Memory() {
}
uint8_t EightBit::Memory::peek(uint16_t address) {
return m_bus[address];
bool rom;
return reference(address, rom);
}
void EightBit::Memory::poke(uint16_t address, uint8_t value) {
m_bus[address] = value;
bool rom;
reference(address, rom) = value;
}
uint16_t EightBit::Memory::peekWord(uint16_t address) {