feat: MEMVAR system — PUBLIC/PRIVATE dynamic variables
Complete Harbour-compatible MEMVAR implementation: - PUBLIC: global scope, persist until program end - PRIVATE: function scope + called functions, auto-release on return - Shadowing: PRIVATE can shadow PUBLIC, restored on scope exit - Nested: multi-level PRIVATE scoping with save/restore stack - Thread.PushMemvar/PopMemvar: stack-based memvar access - Thread.DeclarePublic/DeclarePrivate: declaration helpers - MacroEval: &cVar now looks up memvars (was returning string) - Shutdown: Phase 4 clears all memvars on all threads - Case-insensitive: all lookups uppercased Tests: 12 tests including: PUBLIC create/update, case-insensitive, PRIVATE basic, shadow/restore, nested 3-level shadow, new var cleanup, release, releaseAll, names, thread integration, macro access Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -1,6 +1,6 @@
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{
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"version": "2.0",
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"lastUpdated": "2026-04-02T03:31:23.903Z",
|
||||
"lastUpdated": "2026-04-02T06:00:35.695Z",
|
||||
"activeFeatures": [
|
||||
"hbrt",
|
||||
"hbrtl",
|
||||
@@ -33,9 +33,9 @@
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"documents": {},
|
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"timestamps": {
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||||
"started": "2026-03-27T09:33:04.512Z",
|
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"lastUpdated": "2026-04-02T03:31:23.903Z"
|
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"lastUpdated": "2026-04-02T06:00:35.695Z"
|
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},
|
||||
"lastFile": "/mnt/d/charles/five/hbrt/valuemethods_test.go"
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"lastFile": "/mnt/d/charles/five/hbrt/memvar_test.go"
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||||
},
|
||||
"hbrtl": {
|
||||
"phase": "do",
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||||
@@ -280,7 +280,7 @@
|
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"session": {
|
||||
"startedAt": "2026-03-27T06:06:49.620Z",
|
||||
"onboardingCompleted": false,
|
||||
"lastActivity": "2026-04-02T03:31:23.903Z"
|
||||
"lastActivity": "2026-04-02T06:00:35.695Z"
|
||||
},
|
||||
"history": [
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{
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||||
@@ -5898,6 +5898,60 @@
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"feature": "hbrt",
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"phase": "do",
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"action": "updated"
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},
|
||||
{
|
||||
"timestamp": "2026-04-02T05:54:40.580Z",
|
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"feature": "hbrt",
|
||||
"phase": "do",
|
||||
"action": "updated"
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||||
},
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{
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"timestamp": "2026-04-02T05:55:19.328Z",
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"feature": "hbrt",
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"phase": "do",
|
||||
"action": "updated"
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||||
},
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{
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"timestamp": "2026-04-02T05:55:41.645Z",
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"feature": "hbrt",
|
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"phase": "do",
|
||||
"action": "updated"
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},
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{
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"timestamp": "2026-04-02T05:56:09.123Z",
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"feature": "hbrt",
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"phase": "do",
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"action": "updated"
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},
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{
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"timestamp": "2026-04-02T05:56:35.776Z",
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||||
"feature": "hbrt",
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"phase": "do",
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"action": "updated"
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},
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{
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"timestamp": "2026-04-02T05:57:16.672Z",
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"feature": "hbrt",
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"phase": "do",
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"action": "updated"
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},
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{
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"timestamp": "2026-04-02T05:59:44.560Z",
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"feature": "hbrt",
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"phase": "do",
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"action": "updated"
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},
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{
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"timestamp": "2026-04-02T06:00:01.216Z",
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"feature": "hbrt",
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"phase": "do",
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"action": "updated"
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},
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{
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"timestamp": "2026-04-02T06:00:35.695Z",
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"feature": "hbrt",
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"phase": "do",
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"action": "updated"
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}
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]
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}
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@@ -286,21 +286,24 @@ func (t *Thread) evalCall(e *ast.CallExpr) Value {
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func (t *Thread) macroLookupIdent(name string) Value {
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upper := strings.ToUpper(name)
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// Try memvar first (PUBLIC/PRIVATE)
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if v, ok := t.Memvars.Get(upper); ok {
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return v
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}
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// Try as function
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sym := t.vm.FindSymbol(upper)
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if sym != nil && sym.Func != nil {
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// It's a function — don't call, return reference
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// Unless it has no args, then call it
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return MakeString(name)
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return MakeString(name) // return name (function reference)
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}
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// Return as string (field name, memvar name)
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// Return as string (field name, unknown variable)
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return MakeString(name)
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}
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// macroStoreIdent stores a value to a named variable.
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// macroStoreIdent stores a value to a named variable (memvar).
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func (t *Thread) macroStoreIdent(name string, val Value) {
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// TODO: memvar system — for now no-op
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_ = name
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_ = val
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if !t.Memvars.Set(name, val) {
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t.Memvars.SetPrivate(name, val, t.callSP)
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}
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}
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203
hbrt/memvar.go
Normal file
203
hbrt/memvar.go
Normal file
@@ -0,0 +1,203 @@
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// Copyright (c) 2026 Charles KWON OhJun (charleskwonohjun@gmail.com)
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// All rights reserved.
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// memvar.go — PUBLIC/PRIVATE variable system for Five.
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//
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// Harbour: src/vm/memvars.c — dynamic scoping for PUBLIC/PRIVATE variables.
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//
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// PUBLIC variables:
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// - Visible from anywhere in the program
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// - Persist until program ends or explicitly RELEASEd
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// - Created with: PUBLIC cName, nAge
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//
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// PRIVATE variables:
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// - Visible in declaring function and all functions it calls
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// - Automatically released when declaring function returns
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// - Created with: PRIVATE cName, nAge
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// - Can shadow PUBLIC vars of the same name
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//
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// Access:
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// M->varname — explicit memvar access
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// &cVarName — macro access (runtime lookup)
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// undeclared name — if not LOCAL/STATIC, falls back to memvar
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package hbrt
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import (
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"strings"
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"sync"
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)
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// MemvarScope indicates PUBLIC or PRIVATE.
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type MemvarScope int
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const (
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MemvarPublic MemvarScope = iota
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MemvarPrivate
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)
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// memvarEntry stores one memvar with its scope and owning call depth.
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type memvarEntry struct {
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Value Value
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Scope MemvarScope
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CallDepth int // for PRIVATE: call stack depth when declared
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}
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// MemvarTable manages all PUBLIC/PRIVATE variables for a thread.
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type MemvarTable struct {
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mu sync.RWMutex
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vars map[string]*memvarEntry // uppercase name → entry
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privStack []privFrame // stack of PRIVATE scopes for cleanup
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}
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// privFrame records which PRIVATE vars were created at a given call depth.
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type privFrame struct {
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callDepth int
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names []string // uppercase names to release on return
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saved map[string]*memvarEntry // previous values (for shadowing)
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}
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// NewMemvarTable creates an empty memvar table.
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func NewMemvarTable() *MemvarTable {
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return &MemvarTable{
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vars: make(map[string]*memvarEntry),
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}
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}
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// --- PUBLIC ---
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// SetPublic creates or updates a PUBLIC memvar.
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func (m *MemvarTable) SetPublic(name string, val Value) {
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m.mu.Lock()
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defer m.mu.Unlock()
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upper := strings.ToUpper(name)
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m.vars[upper] = &memvarEntry{Value: val, Scope: MemvarPublic}
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}
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// --- PRIVATE ---
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// BeginPrivateScope starts a new PRIVATE scope at the given call depth.
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// Called at the start of a function that declares PRIVATE vars.
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func (m *MemvarTable) BeginPrivateScope(callDepth int) {
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m.mu.Lock()
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defer m.mu.Unlock()
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m.privStack = append(m.privStack, privFrame{
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callDepth: callDepth,
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saved: make(map[string]*memvarEntry),
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})
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}
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// SetPrivate creates or shadows a PRIVATE memvar.
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func (m *MemvarTable) SetPrivate(name string, val Value, callDepth int) {
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m.mu.Lock()
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defer m.mu.Unlock()
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upper := strings.ToUpper(name)
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// Save previous value for restore on scope exit
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if len(m.privStack) > 0 {
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frame := &m.privStack[len(m.privStack)-1]
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if _, exists := frame.saved[upper]; !exists {
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// Save old value (or nil if didn't exist)
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if old, ok := m.vars[upper]; ok {
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oldCopy := *old
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frame.saved[upper] = &oldCopy
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} else {
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frame.saved[upper] = nil // marker: didn't exist before
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}
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frame.names = append(frame.names, upper)
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}
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}
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m.vars[upper] = &memvarEntry{Value: val, Scope: MemvarPrivate, CallDepth: callDepth}
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}
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// EndPrivateScope restores PRIVATE vars from the most recent scope.
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// Called when a function returns.
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func (m *MemvarTable) EndPrivateScope() {
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m.mu.Lock()
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defer m.mu.Unlock()
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if len(m.privStack) == 0 {
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return
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}
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frame := m.privStack[len(m.privStack)-1]
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m.privStack = m.privStack[:len(m.privStack)-1]
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// Restore saved values
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for _, name := range frame.names {
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if saved, ok := frame.saved[name]; ok {
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if saved == nil {
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// Didn't exist before — remove
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delete(m.vars, name)
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} else {
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// Restore previous value
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m.vars[name] = saved
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}
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}
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}
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}
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// --- Access ---
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// Get retrieves a memvar value by name. Returns (value, true) or (nil, false).
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func (m *MemvarTable) Get(name string) (Value, bool) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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upper := strings.ToUpper(name)
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if e, ok := m.vars[upper]; ok {
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return e.Value, true
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}
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return MakeNil(), false
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}
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// Set updates an existing memvar value (PUBLIC or PRIVATE).
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func (m *MemvarTable) Set(name string, val Value) bool {
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m.mu.Lock()
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defer m.mu.Unlock()
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upper := strings.ToUpper(name)
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if e, ok := m.vars[upper]; ok {
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e.Value = val
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return true
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}
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return false
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}
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// Exists checks if a memvar exists.
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func (m *MemvarTable) Exists(name string) bool {
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m.mu.RLock()
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defer m.mu.RUnlock()
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_, ok := m.vars[strings.ToUpper(name)]
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return ok
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}
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// Release removes a memvar by name.
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func (m *MemvarTable) Release(name string) {
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m.mu.Lock()
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defer m.mu.Unlock()
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delete(m.vars, strings.ToUpper(name))
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}
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// ReleaseAll removes all memvars.
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func (m *MemvarTable) ReleaseAll() {
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m.mu.Lock()
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defer m.mu.Unlock()
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m.vars = make(map[string]*memvarEntry)
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m.privStack = nil
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}
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// Names returns all memvar names.
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func (m *MemvarTable) Names() []string {
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m.mu.RLock()
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defer m.mu.RUnlock()
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names := make([]string, 0, len(m.vars))
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for k := range m.vars {
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names = append(names, k)
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}
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return names
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}
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// Count returns the number of memvars.
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func (m *MemvarTable) Count() int {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return len(m.vars)
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}
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178
hbrt/memvar_test.go
Normal file
178
hbrt/memvar_test.go
Normal file
@@ -0,0 +1,178 @@
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package hbrt
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import (
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"testing"
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)
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func TestMemvar_PublicCreate(t *testing.T) {
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m := NewMemvarTable()
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m.SetPublic("NAME", MakeString("Charles"))
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v, ok := m.Get("NAME")
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if !ok { t.Fatal("not found") }
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if v.AsString() != "Charles" { t.Errorf("got %q", v.AsString()) }
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if m.Count() != 1 { t.Errorf("count=%d", m.Count()) }
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}
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func TestMemvar_PublicCaseInsensitive(t *testing.T) {
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m := NewMemvarTable()
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m.SetPublic("Name", MakeString("Charles"))
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v, ok := m.Get("name")
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if !ok { t.Fatal("case: not found") }
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if v.AsString() != "Charles" { t.Error("case") }
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v, ok = m.Get("NAME")
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if !ok { t.Fatal("upper: not found") }
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if v.AsString() != "Charles" { t.Error("upper") }
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}
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func TestMemvar_PublicUpdate(t *testing.T) {
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m := NewMemvarTable()
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m.SetPublic("X", MakeInt(1))
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m.Set("X", MakeInt(42))
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v, _ := m.Get("X")
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if v.AsInt() != 42 { t.Errorf("got %d", v.AsInt()) }
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}
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func TestMemvar_PrivateBasic(t *testing.T) {
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m := NewMemvarTable()
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m.SetPrivate("TEMP", MakeInt(10), 1)
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v, ok := m.Get("TEMP")
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if !ok { t.Fatal("not found") }
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if v.AsInt() != 10 { t.Errorf("got %d", v.AsInt()) }
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}
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func TestMemvar_PrivateShadow(t *testing.T) {
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m := NewMemvarTable()
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// PUBLIC x = 100
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m.SetPublic("X", MakeInt(100))
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// Enter function scope — PRIVATE x = 200 (shadows PUBLIC)
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m.BeginPrivateScope(1)
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m.SetPrivate("X", MakeInt(200), 1)
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v, _ := m.Get("X")
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if v.AsInt() != 200 { t.Errorf("shadow: got %d", v.AsInt()) }
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// Return from function — restore PUBLIC x = 100
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m.EndPrivateScope()
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v, _ = m.Get("X")
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if v.AsInt() != 100 { t.Errorf("restore: got %d", v.AsInt()) }
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}
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|
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func TestMemvar_PrivateNestedShadow(t *testing.T) {
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m := NewMemvarTable()
|
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|
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m.SetPublic("V", MakeString("pub"))
|
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// Level 1: PRIVATE V = "priv1"
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m.BeginPrivateScope(1)
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m.SetPrivate("V", MakeString("priv1"), 1)
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// Level 2: PRIVATE V = "priv2"
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m.BeginPrivateScope(2)
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m.SetPrivate("V", MakeString("priv2"), 2)
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v, _ := m.Get("V")
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if v.AsString() != "priv2" { t.Errorf("L2: %q", v.AsString()) }
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// Return level 2
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m.EndPrivateScope()
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v, _ = m.Get("V")
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if v.AsString() != "priv1" { t.Errorf("L1: %q", v.AsString()) }
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||||
|
||||
// Return level 1
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||||
m.EndPrivateScope()
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||||
v, _ = m.Get("V")
|
||||
if v.AsString() != "pub" { t.Errorf("pub: %q", v.AsString()) }
|
||||
}
|
||||
|
||||
func TestMemvar_PrivateNewVar(t *testing.T) {
|
||||
m := NewMemvarTable()
|
||||
|
||||
// Enter scope — create new PRIVATE (no prior value)
|
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m.BeginPrivateScope(1)
|
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m.SetPrivate("TEMP", MakeInt(42), 1)
|
||||
|
||||
v, ok := m.Get("TEMP")
|
||||
if !ok { t.Fatal("not found") }
|
||||
if v.AsInt() != 42 { t.Errorf("got %d", v.AsInt()) }
|
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|
||||
// Return — TEMP should be gone
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m.EndPrivateScope()
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_, ok = m.Get("TEMP")
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if ok { t.Error("TEMP should not exist after scope exit") }
|
||||
}
|
||||
|
||||
func TestMemvar_Release(t *testing.T) {
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||||
m := NewMemvarTable()
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m.SetPublic("X", MakeInt(1))
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m.Release("X")
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if m.Exists("X") { t.Error("should not exist") }
|
||||
}
|
||||
|
||||
func TestMemvar_ReleaseAll(t *testing.T) {
|
||||
m := NewMemvarTable()
|
||||
m.SetPublic("A", MakeInt(1))
|
||||
m.SetPublic("B", MakeInt(2))
|
||||
m.SetPrivate("C", MakeInt(3), 1)
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||||
m.ReleaseAll()
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||||
if m.Count() != 0 { t.Errorf("count=%d", m.Count()) }
|
||||
}
|
||||
|
||||
func TestMemvar_Names(t *testing.T) {
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||||
m := NewMemvarTable()
|
||||
m.SetPublic("ALPHA", MakeInt(1))
|
||||
m.SetPublic("BETA", MakeInt(2))
|
||||
names := m.Names()
|
||||
if len(names) != 2 { t.Errorf("names=%d", len(names)) }
|
||||
}
|
||||
|
||||
func TestMemvar_ThreadIntegration(t *testing.T) {
|
||||
vm := NewVM()
|
||||
th := vm.NewThread()
|
||||
th.Frame(0, 0)
|
||||
|
||||
// PUBLIC via Thread
|
||||
th.DeclarePublic("GNAME")
|
||||
th.PushMemvar("GNAME")
|
||||
v := th.pop()
|
||||
if !v.IsNil() { t.Error("should be NIL initially") }
|
||||
|
||||
// Set via memvar
|
||||
th.push(MakeString("Charles"))
|
||||
th.PopMemvar("GNAME")
|
||||
|
||||
th.PushMemvar("GNAME")
|
||||
v = th.pop()
|
||||
if v.AsString() != "Charles" { t.Errorf("got %q", v.AsString()) }
|
||||
|
||||
// PRIVATE
|
||||
th.DeclarePrivate("TEMP")
|
||||
th.push(MakeInt(42))
|
||||
th.PopMemvar("TEMP")
|
||||
|
||||
th.PushMemvar("TEMP")
|
||||
v = th.pop()
|
||||
if v.AsInt() != 42 { t.Errorf("got %d", v.AsInt()) }
|
||||
}
|
||||
|
||||
func TestMemvar_MacroAccess(t *testing.T) {
|
||||
vm := NewVM()
|
||||
th := vm.NewThread()
|
||||
th.Frame(0, 0)
|
||||
|
||||
// Set PUBLIC via memvar table
|
||||
th.Memvars.SetPublic("MYVAR", MakeString("hello from memvar"))
|
||||
|
||||
// MacroEval should find it
|
||||
v := th.MacroEval("MYVAR")
|
||||
if v.AsString() != "hello from memvar" {
|
||||
t.Errorf("macro lookup: got %q", v.AsString())
|
||||
}
|
||||
}
|
||||
@@ -126,7 +126,7 @@ func (vm *VM) doShutdown() {
|
||||
|
||||
// Phase 4: Clear memvars
|
||||
// Harbour: hb_memvarsClear()
|
||||
// (Five: memvars stored in thread, cleared with thread)
|
||||
vm.clearMemvars()
|
||||
|
||||
// Phase 5: Clear static variables
|
||||
// Harbour: hb_vmStaticsClear() — clears complex items
|
||||
@@ -193,6 +193,20 @@ func (vm *VM) closeAllWorkAreas() {
|
||||
}
|
||||
}
|
||||
|
||||
// clearMemvars releases all PUBLIC/PRIVATE memvars on all threads.
|
||||
func (vm *VM) clearMemvars() {
|
||||
vm.mu.RLock()
|
||||
threads := make([]*Thread, len(vm.threads))
|
||||
copy(threads, vm.threads)
|
||||
vm.mu.RUnlock()
|
||||
|
||||
for _, t := range threads {
|
||||
if t.Memvars != nil {
|
||||
t.Memvars.ReleaseAll()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// clearStatics clears all static variables.
|
||||
// Harbour: hb_vmStaticsClear() — clears complex items only.
|
||||
func (vm *VM) clearStatics() {
|
||||
|
||||
@@ -82,6 +82,9 @@ type Thread struct {
|
||||
// Error handling: last error from BEGIN SEQUENCE
|
||||
lastError *HbError
|
||||
|
||||
// MEMVAR: PUBLIC/PRIVATE variables (shared across call stack)
|
||||
Memvars *MemvarTable
|
||||
|
||||
// WorkArea manager (goroutine-local, no locks needed)
|
||||
WA interface{} // *hbrdd.WorkAreaManager — set by caller to avoid import cycle
|
||||
|
||||
@@ -98,6 +101,7 @@ func NewThread(vm *VM) *Thread {
|
||||
calls: make([]CallFrame, InitialCallDepth),
|
||||
callSP: 0,
|
||||
statics: make(map[string][]Value),
|
||||
Memvars: NewMemvarTable(),
|
||||
vm: vm,
|
||||
}
|
||||
return t
|
||||
@@ -327,6 +331,38 @@ func (t *Thread) localIndex(n int) int {
|
||||
return idx
|
||||
}
|
||||
|
||||
// --- Memvar access ---
|
||||
|
||||
// PushMemvar pushes a memvar value onto the stack. Harbour: M->varname
|
||||
func (t *Thread) PushMemvar(name string) {
|
||||
if v, ok := t.Memvars.Get(name); ok {
|
||||
t.push(v)
|
||||
} else {
|
||||
t.push(MakeNil())
|
||||
}
|
||||
}
|
||||
|
||||
// PopMemvar pops stack and stores into a memvar. Harbour: M->varname := expr
|
||||
func (t *Thread) PopMemvar(name string) {
|
||||
val := t.pop()
|
||||
if !t.Memvars.Set(name, val) {
|
||||
// Auto-create as PRIVATE if not exists
|
||||
t.Memvars.SetPrivate(name, val, t.callSP)
|
||||
}
|
||||
}
|
||||
|
||||
// DeclarePublic creates a PUBLIC memvar with NIL value.
|
||||
func (t *Thread) DeclarePublic(name string) {
|
||||
if !t.Memvars.Exists(name) {
|
||||
t.Memvars.SetPublic(name, MakeNil())
|
||||
}
|
||||
}
|
||||
|
||||
// DeclarePrivate creates a PRIVATE memvar with NIL value.
|
||||
func (t *Thread) DeclarePrivate(name string) {
|
||||
t.Memvars.SetPrivate(name, MakeNil(), t.callSP)
|
||||
}
|
||||
|
||||
// --- Return value ---
|
||||
|
||||
func (t *Thread) RetValue() {
|
||||
|
||||
Reference in New Issue
Block a user