forked from go-delve/delve
/
mem.go
54 lines (46 loc) · 1.26 KB
/
mem.go
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package proc
const cacheEnabled = true
type memoryReadWriter interface {
readMemory(addr uintptr, size int) (data []byte, err error)
writeMemory(addr uintptr, data []byte) (written int, err error)
}
type memCache struct {
cacheAddr uintptr
cache []byte
mem memoryReadWriter
}
func (m *memCache) contains(addr uintptr, size int) bool {
return addr >= m.cacheAddr && (addr+uintptr(size)) <= (m.cacheAddr+uintptr(len(m.cache)))
}
func (m *memCache) readMemory(addr uintptr, size int) (data []byte, err error) {
if m.contains(addr, size) {
d := make([]byte, size)
copy(d, m.cache[addr-m.cacheAddr:])
return d, nil
}
return m.mem.readMemory(addr, size)
}
func (m *memCache) writeMemory(addr uintptr, data []byte) (written int, err error) {
return m.mem.writeMemory(addr, data)
}
func cacheMemory(mem memoryReadWriter, addr uintptr, size int) memoryReadWriter {
if !cacheEnabled {
return mem
}
if cacheMem, isCache := mem.(*memCache); isCache {
if cacheMem.contains(addr, size) {
return mem
} else {
cache, err := cacheMem.mem.readMemory(addr, size)
if err != nil {
return mem
}
return &memCache{addr, cache, mem}
}
}
cache, err := mem.readMemory(addr, size)
if err != nil {
return mem
}
return &memCache{addr, cache, mem}
}