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Insert an indirection to avoid over-allocating memory for RAM.
This commit is contained in:
Kartik Agaram 2018-07-08 22:35:48 -07:00
parent 665a4d7040
commit b0832f6676
1 changed files with 14 additions and 12 deletions
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26
subx/010core.cc
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@ -65,51 +65,53 @@ SF = ZF = OF = false;
:(before "End Globals")
vector<uint8_t> Mem;
uint32_t Mem_offset = 0;
uint32_t End_of_program = 0;
:(before "End Reset")
Mem.clear();
Mem.resize(1024);
Mem_offset = 0;
End_of_program = 0;
:(code)
// These helpers depend on Mem being laid out contiguously (so you can't use a
// map, etc.) and on the host also being little-endian.
inline uint8_t read_mem_u8(uint32_t addr) {
return Mem.at(addr);
return Mem.at(addr-Mem_offset);
}
inline int8_t read_mem_i8(uint32_t addr) {
return static_cast<int8_t>(Mem.at(addr));
return static_cast<int8_t>(Mem.at(addr-Mem_offset));
}
inline uint32_t read_mem_u32(uint32_t addr) {
return *reinterpret_cast<uint32_t*>(&Mem.at(addr));
return *reinterpret_cast<uint32_t*>(&Mem.at(addr-Mem_offset));
}
inline int32_t read_mem_i32(uint32_t addr) {
return *reinterpret_cast<int32_t*>(&Mem.at(addr));
return *reinterpret_cast<int32_t*>(&Mem.at(addr-Mem_offset));
}
inline uint8_t* mem_addr_u8(uint32_t addr) {
return &Mem.at(addr);
return &Mem.at(addr-Mem_offset);
}
inline int8_t* mem_addr_i8(uint32_t addr) {
return reinterpret_cast<int8_t*>(&Mem.at(addr));
return reinterpret_cast<int8_t*>(&Mem.at(addr-Mem_offset));
}
inline uint32_t* mem_addr_u32(uint32_t addr) {
return reinterpret_cast<uint32_t*>(&Mem.at(addr));
return reinterpret_cast<uint32_t*>(&Mem.at(addr-Mem_offset));
}
inline int32_t* mem_addr_i32(uint32_t addr) {
return reinterpret_cast<int32_t*>(&Mem.at(addr));
return reinterpret_cast<int32_t*>(&Mem.at(addr-Mem_offset));
}
inline void write_mem_u8(uint32_t addr, uint8_t val) {
Mem.at(addr) = val;
Mem.at(addr-Mem_offset) = val;
}
inline void write_mem_i8(uint32_t addr, int8_t val) {
Mem.at(addr) = static_cast<uint8_t>(val);
Mem.at(addr-Mem_offset) = static_cast<uint8_t>(val);
}
inline void write_mem_u32(uint32_t addr, uint32_t val) {
*reinterpret_cast<uint32_t*>(&Mem.at(addr)) = val;
*reinterpret_cast<uint32_t*>(&Mem.at(addr-Mem_offset)) = val;
}
inline void write_mem_i32(uint32_t addr, int32_t val) {
*reinterpret_cast<int32_t*>(&Mem.at(addr)) = val;
*reinterpret_cast<int32_t*>(&Mem.at(addr-Mem_offset)) = val;
}
//:: core interpreter loop