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tracer.go
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tracer.go
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/*
* Copyright 2018 De-labtory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package translate
import (
"fmt"
)
const EntrySize = 8
type EntryError struct {
Id string
}
func (e EntryError) Error() string {
return fmt.Sprintf("[%s] definition doesn't exist", e.Id)
}
type MemTracer interface {
MemDefiner
MemGetter
}
// Define() saves an variable to EntryMap and increase the MemoryCounter.
// This should be used when compiles the assign statement.
// ex)
// a = 5 -> Define("a", 5)
// b = "abc" -> Define("b", "abc")
type MemDefiner interface {
Define(id string) MemEntry
}
// MemGetter gets the data of the memory entry.
// GetOffsetOfEntry() returns the offset of the memory entry corresponding the Id.
// GetSizeOfEntry() returns the size of the memory entry corresponding the Id.
type MemGetter interface {
Entry(id string) (MemEntry, error)
Counter() int
MemSize() int
}
// MemEntry saves size and offset of the value which the variable has.
type MemEntry struct {
Offset int
Size int
}
// MemEntryTable is used to know the location of the memory
type MemEntryTable struct {
EntryMap map[string]MemEntry
MemoryCounter int
}
func NewMemEntryTable() *MemEntryTable {
return &MemEntryTable{
EntryMap: make(map[string]MemEntry),
MemoryCounter: 0,
}
}
func (m *MemEntryTable) Define(id string) MemEntry {
entry := MemEntry{
Offset: m.MemoryCounter,
}
entry.Size = EntrySize
m.MemoryCounter += EntrySize
m.EntryMap[id] = entry
return entry
}
func (m MemEntryTable) Entry(id string) (MemEntry, error) {
entry, ok := m.EntryMap[id]
if !ok {
return MemEntry{}, EntryError{
Id: id,
}
}
return entry, nil
}
// TODO: implement test cases :-)
func (m MemEntryTable) Counter() int {
return m.MemoryCounter
}
// TODO: implement test cases :-)
func (m MemEntryTable) MemSize() int {
return m.MemoryCounter
}