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merge: pull request #2 from
raklaptudirm/vm
`core`: implement working virtual machine
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // Copyright © 2021 Rak Laptudirm <raklaptudirm@gmail.com> | ||
| // | ||
| // 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 | ||
| // http://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 main | ||
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| import ( | ||
| "fmt" | ||
| "os" | ||
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| "laptudirm.com/x/brainfuck/pkg/lexer" | ||
| "laptudirm.com/x/brainfuck/pkg/parser" | ||
| "laptudirm.com/x/brainfuck/pkg/token" | ||
| "laptudirm.com/x/brainfuck/pkg/vm" | ||
| ) | ||
|
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| const Memory = 30000 | ||
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| func main() { | ||
| if len(os.Args) != 2 { | ||
| fmt.Fprintln(os.Stderr, "usage: brainfuck [filename]") | ||
| os.Exit(1) | ||
| } | ||
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| filename := os.Args[1] | ||
| file, err := os.ReadFile(filename) | ||
| if err != nil { | ||
| fmt.Fprintln(os.Stderr, err) | ||
| } | ||
|
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| var l lexer.Lexer | ||
| l.Init(string(file), handleErr) | ||
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| var p parser.Parser | ||
| p.Init(&l, handleErr) | ||
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| program := p.ParseProgram() | ||
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| if l.ErrorCount > 0 || p.ErrorCount > 0 { | ||
| os.Exit(1) | ||
| } | ||
|
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| m := vm.New(Memory) | ||
| err = m.Execute(program) | ||
| if err != nil { | ||
| printErr(err.Error()) | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
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| func handleErr(p token.Position, e string) { | ||
| printErr("%s: %v\n", p, e) | ||
| } | ||
|
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| func printErr(format string, a ...interface{}) error { | ||
| _, err := fmt.Fprintf(os.Stderr, format, a...) | ||
| return err | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,3 @@ | ||
| module github.com/raklaptudirm/brainfuck | ||
| module laptudirm.com/x/brainfuck | ||
|
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| go 1.16 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // Copyright © 2021 Rak Laptudirm <raklaptudirm@gmail.com> | ||
| // | ||
| // 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 | ||
| // http://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. | ||
|
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| package vm | ||
|
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| import ( | ||
| "errors" | ||
| "fmt" | ||
|
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| "laptudirm.com/x/brainfuck/pkg/ast" | ||
| "laptudirm.com/x/brainfuck/pkg/token" | ||
| ) | ||
|
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| type Machine struct { | ||
| Length int | ||
| Memory []byte | ||
| Pointer int | ||
| } | ||
|
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| func New(l int) *Machine { | ||
| return &Machine{ | ||
| Length: l, | ||
| Memory: make([]byte, l), | ||
| } | ||
| } | ||
|
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| var ErrAst = errors.New("invalid ast structure") | ||
|
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| func (m *Machine) Execute(n ast.Node) error { | ||
| switch v := n.(type) { | ||
| case *ast.Program: | ||
| return m.executeOperations(v.Operations) | ||
| case *ast.Comment: | ||
| return nil // ignore comments | ||
| case *ast.Loop: | ||
| if m.Memory[m.Pointer] == 0 { | ||
| return nil | ||
| } | ||
|
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| for { | ||
| err := m.executeOperations(v.Operations) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| if m.Memory[m.Pointer] == 0 { | ||
| return nil | ||
| } | ||
| } | ||
| case *ast.Operator: | ||
| return m.executeOperator(v) | ||
| default: | ||
| return ErrAst | ||
| } | ||
| } | ||
|
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| func (m *Machine) executeOperations(operations []ast.Operation) error { | ||
| for _, operation := range operations { | ||
| err := m.Execute(operation) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
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| return nil | ||
| } | ||
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| func (m *Machine) executeOperator(o *ast.Operator) error { | ||
| switch o.Token { | ||
| case token.INC_VAL: | ||
| m.Memory[m.Pointer]++ | ||
| case token.DEC_VAL: | ||
| m.Memory[m.Pointer]-- | ||
| case token.INC_PTR: | ||
| m.Pointer++ | ||
| case token.DEC_PTR: | ||
| m.Pointer-- | ||
| case token.INPUT: | ||
| _, err := fmt.Scanf("%c", &m.Memory[m.Pointer]) | ||
| return err | ||
| case token.PRINT: | ||
| fmt.Print(string(m.Memory[m.Pointer])) | ||
| default: | ||
| return fmt.Errorf("invalid operator %s", o.Token) | ||
| } | ||
|
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| return nil | ||
| } |