VDScriptInterp.cpp@ 85959

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1	/* $Id: VDScriptInterp.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* VBox HDD container test utility - scripting engine, interpreter.
4	*/
5
6	/*
7	* Copyright (C) 2013-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	#define LOGGROUP LOGGROUP_DEFAULT
19	#include <iprt/assert.h>
20	#include <iprt/err.h>
21	#include <iprt/list.h>
22	#include <iprt/mem.h>
23	#include <iprt/stream.h>
24	#include <iprt/string.h>
25
26	#include <VBox/log.h>
27
28	#include "VDScriptAst.h"
29	#include "VDScriptStack.h"
30	#include "VDScriptInternal.h"
31
32	/**
33	* Interpreter variable.
34	*/
35	typedef struct VDSCRIPTINTERPVAR
36	{
37	/** String space core. */
38	RTSTRSPACECORE Core;
39	/** Value. */
40	VDSCRIPTARG Value;
41	} VDSCRIPTINTERPVAR;
42	/** Pointer to an interpreter variable. */
43	typedef VDSCRIPTINTERPVAR *PVDSCRIPTINTERPVAR;
44
45	/**
46	* Block scope.
47	*/
48	typedef struct VDSCRIPTINTERPSCOPE
49	{
50	/** Pointer to the enclosing scope if available. */
51	struct VDSCRIPTINTERPSCOPE *pParent;
52	/** String space of declared variables in this scope. */
53	RTSTRSPACE hStrSpaceVar;
54	} VDSCRIPTINTERPSCOPE;
55	/** Pointer to a scope block. */
56	typedef VDSCRIPTINTERPSCOPE *PVDSCRIPTINTERPSCOPE;
57
58	/**
59	* Function call.
60	*/
61	typedef struct VDSCRIPTINTERPFNCALL
62	{
63	/** Pointer to the caller of this function. */
64	struct VDSCRIPTINTERPFNCALL *pCaller;
65	/** Root scope of this function. */
66	VDSCRIPTINTERPSCOPE ScopeRoot;
67	/** Current scope in this function. */
68	PVDSCRIPTINTERPSCOPE pScopeCurr;
69	} VDSCRIPTINTERPFNCALL;
70	/** Pointer to a function call. */
71	typedef VDSCRIPTINTERPFNCALL *PVDSCRIPTINTERPFNCALL;
72
73	/**
74	* Interpreter context.
75	*/
76	typedef struct VDSCRIPTINTERPCTX
77	{
78	/** Pointer to the script context. */
79	PVDSCRIPTCTXINT pScriptCtx;
80	/** Current function call entry. */
81	PVDSCRIPTINTERPFNCALL pFnCallCurr;
82	/** Stack of calculated values. */
83	VDSCRIPTSTACK StackValues;
84	/** Evaluation control stack. */
85	VDSCRIPTSTACK StackCtrl;
86	} VDSCRIPTINTERPCTX;
87	/** Pointer to an interpreter context. */
88	typedef VDSCRIPTINTERPCTX *PVDSCRIPTINTERPCTX;
89
90	/**
91	* Interpreter control type.
92	*/
93	typedef enum VDSCRIPTINTERPCTRLTYPE
94	{
95	VDSCRIPTINTERPCTRLTYPE_INVALID = 0,
96	/** Function call to evaluate now, all values are computed
97	* and are stored on the value stack.
98	*/
99	VDSCRIPTINTERPCTRLTYPE_FN_CALL,
100	/** Cleanup the function call, deleting the scope and restoring the previous one. */
101	VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP,
102	/** If statement to evaluate now, the guard is on the stack. */
103	VDSCRIPTINTERPCTRLTYPE_IF,
104	/** While or for statement. */
105	VDSCRIPTINTERPCTRLTYPE_LOOP,
106	/** switch statement. */
107	VDSCRIPTINTERPCTRLTYPE_SWITCH,
108	/** Compound statement. */
109	VDSCRIPTINTERPCTRLTYPE_COMPOUND,
110	/** 32bit blowup. */
111	VDSCRIPTINTERPCTRLTYPE_32BIT_HACK = 0x7fffffff
112	} VDSCRIPTINTERPCTRLTYPE;
113	/** Pointer to a control type. */
114	typedef VDSCRIPTINTERPCTRLTYPE *PVDSCRIPTINTERPCTRLTYPE;
115
116	/**
117	* Interpreter stack control entry.
118	*/
119	typedef struct VDSCRIPTINTERPCTRL
120	{
121	/** Flag whether this entry points to an AST node to evaluate. */
122	bool fEvalAst;
123	/** Flag dependent data. */
124	union
125	{
126	/** Pointer to the AST node to interprete. */
127	PVDSCRIPTASTCORE pAstNode;
128	/** Interpreter control structure. */
129	struct
130	{
131	/** Type of control. */
132	VDSCRIPTINTERPCTRLTYPE enmCtrlType;
133	/** Function call data. */
134	struct
135	{
136	/** Function to call. */
137	PVDSCRIPTFN pFn;
138	} FnCall;
139	/** Compound statement. */
140	struct
141	{
142	/** The compound statement node. */
143	PVDSCRIPTASTSTMT pStmtCompound;
144	/** Current statement evaluated. */
145	PVDSCRIPTASTSTMT pStmtCurr;
146	} Compound;
147	/** Pointer to an AST node. */
148	PVDSCRIPTASTCORE pAstNode;
149	} Ctrl;
150	};
151	} VDSCRIPTINTERPCTRL;
152	/** Pointer to an exec stack control entry. */
153	typedef VDSCRIPTINTERPCTRL *PVDSCRIPTINTERPCTRL;
154
155	/**
156	* Record an error while interpreting.
157	*
158	* @returns VBox status code passed.
159	* @param pThis The interpreter context.
160	* @param rc The status code to record.
161	* @param RT_SRC_POS Position in the source code.
162	* @param pszFmt Format string.
163	*/
164	static int vdScriptInterpreterError(PVDSCRIPTINTERPCTX pThis, int rc, RT_SRC_POS_DECL, const char *pszFmt, ...)
165	{
166	RT_NOREF1(pThis); RT_SRC_POS_NOREF();
167	va_list va;
168	va_start(va, pszFmt);
169	RTPrintfV(pszFmt, va);
170	va_end(va);
171	return rc;
172	}
173
174	/**
175	* Pops the topmost value from the value stack.
176	*
177	* @returns nothing.
178	* @param pThis The interpreter context.
179	* @param pVal Where to store the value.
180	*/
181	DECLINLINE(void) vdScriptInterpreterPopValue(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTARG pVal)
182	{
183	PVDSCRIPTARG pValStack = (PVDSCRIPTARG)vdScriptStackGetUsed(&pThis->StackValues);
184	if (!pValStack)
185	{
186	RT_ZERO(*pVal);
187	AssertPtrReturnVoid(pValStack);
188	}
189
190	pVal = pValStack;
191	vdScriptStackPop(&pThis->StackValues);
192	}
193
194	/**
195	* Pushes a given value onto the value stack.
196	*/
197	DECLINLINE(int) vdScriptInterpreterPushValue(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTARG pVal)
198	{
199	PVDSCRIPTARG pValStack = (PVDSCRIPTARG)vdScriptStackGetUnused(&pThis->StackValues);
200	if (!pValStack)
201	return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory pushing a value on the value stack");
202
203	pValStack = pVal;
204	vdScriptStackPush(&pThis->StackValues);
205	return VINF_SUCCESS;
206	}
207
208	/**
209	* Pushes an AST node onto the control stack.
210	*
211	* @returns VBox status code.
212	* @param pThis The interpreter context.
213	* @param enmCtrlType The control entry type.
214	*/
215	DECLINLINE(int) vdScriptInterpreterPushAstEntry(PVDSCRIPTINTERPCTX pThis,
216	PVDSCRIPTASTCORE pAstNode)
217	{
218	PVDSCRIPTINTERPCTRL pCtrl = NULL;
219
220	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
221
222	if (pCtrl)
223	{
224	pCtrl->fEvalAst = true;
225	pCtrl->pAstNode = pAstNode;
226	vdScriptStackPush(&pThis->StackCtrl);
227	return VINF_SUCCESS;
228	}
229
230	return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
231	}
232
233	/**
234	* Pushes a control entry without additional data onto the stack.
235	*
236	* @returns VBox status code.
237	* @param pThis The interpreter context.
238	* @param enmCtrlType The control entry type.
239	*/
240	DECLINLINE(int) vdScriptInterpreterPushNonDataCtrlEntry(PVDSCRIPTINTERPCTX pThis,
241	VDSCRIPTINTERPCTRLTYPE enmCtrlType)
242	{
243	PVDSCRIPTINTERPCTRL pCtrl = NULL;
244
245	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
246	if (pCtrl)
247	{
248	pCtrl->fEvalAst = false;
249	pCtrl->Ctrl.enmCtrlType = enmCtrlType;
250	vdScriptStackPush(&pThis->StackCtrl);
251	return VINF_SUCCESS;
252	}
253
254	return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
255	}
256
257	/**
258	* Pushes a compound statement control entry onto the stack.
259	*
260	* @returns VBox status code.
261	* @param pThis The interpreter context.
262	* @param pStmtFirst The first statement of the compound statement
263	*/
264	DECLINLINE(int) vdScriptInterpreterPushCompoundCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
265	{
266	PVDSCRIPTINTERPCTRL pCtrl = NULL;
267
268	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
269	if (pCtrl)
270	{
271	pCtrl->fEvalAst = false;
272	pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_COMPOUND;
273	pCtrl->Ctrl.Compound.pStmtCompound = pStmt;
274	pCtrl->Ctrl.Compound.pStmtCurr = RTListGetFirst(&pStmt->Compound.ListStmts, VDSCRIPTASTSTMT, Core.ListNode);
275	vdScriptStackPush(&pThis->StackCtrl);
276	return VINF_SUCCESS;
277	}
278
279	return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
280	}
281
282	/**
283	* Pushes a while statement control entry onto the stack.
284	*
285	* @returns VBox status code.
286	* @param pThis The interpreter context.
287	* @param pStmt The while statement.
288	*/
289	DECLINLINE(int) vdScriptInterpreterPushWhileCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
290	{
291	int rc = VINF_SUCCESS;
292	PVDSCRIPTINTERPCTRL pCtrl = NULL;
293
294	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
295	if (pCtrl)
296	{
297	pCtrl->fEvalAst = false;
298	pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_LOOP;
299	pCtrl->Ctrl.pAstNode = &pStmt->Core;
300	vdScriptStackPush(&pThis->StackCtrl);
301
302	rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->While.pCond->Core);
303	if ( RT_SUCCESS(rc)
304	&& pStmt->While.fDoWhile)
305	{
306	/* Push the statement to execute for do ... while loops because they run at least once. */
307	rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->While.pStmt->Core);
308	if (RT_FAILURE(rc))
309	{
310	/* Cleanup while control statement and AST node. */
311	vdScriptStackPop(&pThis->StackCtrl);
312	vdScriptStackPop(&pThis->StackCtrl);
313	}
314	}
315	else if (RT_FAILURE(rc))
316	vdScriptStackPop(&pThis->StackCtrl); /* Cleanup the while control statement. */
317	}
318	else
319	rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
320
321	return rc;
322	}
323
324	/**
325	* Pushes an if statement control entry onto the stack.
326	*
327	* @returns VBox status code.
328	* @param pThis The interpreter context.
329	* @param pStmt The if statement.
330	*/
331	static int vdScriptInterpreterPushIfCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
332	{
333	int rc = VINF_SUCCESS;
334	PVDSCRIPTINTERPCTRL pCtrl = NULL;
335
336	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
337	if (pCtrl)
338	{
339	pCtrl->fEvalAst = false;
340	pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_IF;
341	pCtrl->Ctrl.pAstNode = &pStmt->Core;
342	vdScriptStackPush(&pThis->StackCtrl);
343
344	rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->If.pCond->Core);
345	}
346	else
347	rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
348
349	return rc;
350	}
351
352	/**
353	* Pushes a for statement control entry onto the stack.
354	*
355	* @returns VBox status code.
356	* @param pThis The interpreter context.
357	* @param pStmt The while statement.
358	*/
359	DECLINLINE(int) vdScriptInterpreterPushForCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
360	{
361	int rc = VINF_SUCCESS;
362	PVDSCRIPTINTERPCTRL pCtrl = NULL;
363
364	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
365	if (pCtrl)
366	{
367	pCtrl->fEvalAst = false;
368	pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_LOOP;
369	pCtrl->Ctrl.pAstNode = &pStmt->Core;
370	vdScriptStackPush(&pThis->StackCtrl);
371
372	/* Push the conditional first and the initializer .*/
373	rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->For.pExprCond->Core);
374	if (RT_SUCCESS(rc))
375	{
376	rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->For.pExprStart->Core);
377	if (RT_FAILURE(rc))
378	vdScriptStackPop(&pThis->StackCtrl);
379	}
380	}
381	else
382	rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
383
384	return rc;
385	}
386
387	/**
388	* Destroy variable string space callback.
389	*/
390	static DECLCALLBACK(int) vdScriptInterpreterVarSpaceDestroy(PRTSTRSPACECORE pStr, void *pvUser)
391	{
392	RT_NOREF1(pvUser);
393	RTMemFree(pStr);
394	return VINF_SUCCESS;
395	}
396
397	/**
398	* Setsup a new scope in the current function call.
399	*
400	* @returns VBox status code.
401	* @param pThis The interpreter context.
402	*/
403	static int vdScriptInterpreterScopeCreate(PVDSCRIPTINTERPCTX pThis)
404	{
405	int rc = VINF_SUCCESS;
406	PVDSCRIPTINTERPSCOPE pScope = (PVDSCRIPTINTERPSCOPE)RTMemAllocZ(sizeof(VDSCRIPTINTERPSCOPE));
407	if (pScope)
408	{
409	pScope->pParent = pThis->pFnCallCurr->pScopeCurr;
410	pScope->hStrSpaceVar = NULL;
411	pThis->pFnCallCurr->pScopeCurr = pScope;
412	}
413	else
414	rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory allocating new scope");
415
416	return rc;
417	}
418
419	/**
420	* Destroys the current scope.
421	*
422	* @returns nothing.
423	* @param pThis The interpreter context.
424	*/
425	static void vdScriptInterpreterScopeDestroyCurr(PVDSCRIPTINTERPCTX pThis)
426	{
427	AssertMsgReturnVoid(pThis->pFnCallCurr->pScopeCurr != &pThis->pFnCallCurr->ScopeRoot,
428	("Current scope is root scope of function call\n"));
429
430	PVDSCRIPTINTERPSCOPE pScope = pThis->pFnCallCurr->pScopeCurr;
431	pThis->pFnCallCurr->pScopeCurr = pScope->pParent;
432	RTStrSpaceDestroy(&pScope->hStrSpaceVar, vdScriptInterpreterVarSpaceDestroy, NULL);
433	RTMemFree(pScope);
434	}
435
436	/**
437	* Get the content of the given variable identifier from the current or parent scope.
438	*/
439	static PVDSCRIPTINTERPVAR vdScriptInterpreterGetVar(PVDSCRIPTINTERPCTX pThis, const char *pszVar)
440	{
441	PVDSCRIPTINTERPSCOPE pScopeCurr = pThis->pFnCallCurr->pScopeCurr;
442	PVDSCRIPTINTERPVAR pVar = NULL;
443
444	while ( !pVar
445	&& pScopeCurr)
446	{
447	pVar = (PVDSCRIPTINTERPVAR)RTStrSpaceGet(&pScopeCurr->hStrSpaceVar, pszVar);
448	if (pVar)
449	break;
450	pScopeCurr = pScopeCurr->pParent;
451	}
452
453
454	return pVar;
455	}
456
457	/**
458	* Evaluate an expression.
459	*
460	* @returns VBox status code.
461	* @param pThis The interpreter context.
462	* @param pExpr The expression to evaluate.
463	*/
464	static int vdScriptInterpreterEvaluateExpression(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTEXPR pExpr)
465	{
466	int rc = VINF_SUCCESS;
467
468	switch (pExpr->enmType)
469	{
470	case VDSCRIPTEXPRTYPE_PRIMARY_NUMCONST:
471	{
472	/* Push the numerical constant on the value stack. */
473	VDSCRIPTARG NumConst;
474	NumConst.enmType = VDSCRIPTTYPE_UINT64;
475	NumConst.u64 = pExpr->u64;
476	rc = vdScriptInterpreterPushValue(pThis, &NumConst);
477	break;
478	}
479	case VDSCRIPTEXPRTYPE_PRIMARY_STRINGCONST:
480	{
481	/* Push the string literal on the value stack. */
482	VDSCRIPTARG StringConst;
483	StringConst.enmType = VDSCRIPTTYPE_STRING;
484	StringConst.psz = pExpr->pszStr;
485	rc = vdScriptInterpreterPushValue(pThis, &StringConst);
486	break;
487	}
488	case VDSCRIPTEXPRTYPE_PRIMARY_BOOLEAN:
489	{
490	VDSCRIPTARG BoolConst;
491	BoolConst.enmType = VDSCRIPTTYPE_BOOL;
492	BoolConst.f = pExpr->f;
493	rc = vdScriptInterpreterPushValue(pThis, &BoolConst);
494	break;
495	}
496	case VDSCRIPTEXPRTYPE_PRIMARY_IDENTIFIER:
497	{
498	/* Look it up and push the value onto the value stack. */
499	PVDSCRIPTINTERPVAR pVar = vdScriptInterpreterGetVar(pThis, pExpr->pIde->aszIde);
500
501	AssertPtrReturn(pVar, VERR_IPE_UNINITIALIZED_STATUS);
502	rc = vdScriptInterpreterPushValue(pThis, &pVar->Value);
503	break;
504	}
505	case VDSCRIPTEXPRTYPE_POSTFIX_INCREMENT:
506	case VDSCRIPTEXPRTYPE_POSTFIX_DECREMENT:
507	AssertMsgFailed(("TODO\n"));
508	RT_FALL_THRU();
509	case VDSCRIPTEXPRTYPE_POSTFIX_FNCALL:
510	{
511	PVDSCRIPTFN pFn = (PVDSCRIPTFN)RTStrSpaceGet(&pThis->pScriptCtx->hStrSpaceFn, pExpr->FnCall.pFnIde->pIde->aszIde);
512	if (pFn)
513	{
514	/* Push a function call control entry on the stack. */
515	PVDSCRIPTINTERPCTRL pCtrlFn = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
516	if (pCtrlFn)
517	{
518	pCtrlFn->fEvalAst = false;
519	pCtrlFn->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_FN_CALL;
520	pCtrlFn->Ctrl.FnCall.pFn = pFn;
521	vdScriptStackPush(&pThis->StackCtrl);
522
523	/* Push parameter expressions on the stack. */
524	PVDSCRIPTASTEXPR pArg = RTListGetFirst(&pExpr->FnCall.ListArgs, VDSCRIPTASTEXPR, Core.ListNode);
525	while (pArg)
526	{
527	rc = vdScriptInterpreterPushAstEntry(pThis, &pArg->Core);
528	if (RT_FAILURE(rc))
529	break;
530	pArg = RTListGetNext(&pExpr->FnCall.ListArgs, pArg, VDSCRIPTASTEXPR, Core.ListNode);
531	}
532	}
533	}
534	else
535	AssertMsgFailed(("Invalid program given, unknown function: %s\n", pExpr->FnCall.pFnIde->pIde->aszIde));
536	break;
537	}
538	case VDSCRIPTEXPRTYPE_UNARY_INCREMENT:
539	case VDSCRIPTEXPRTYPE_UNARY_DECREMENT:
540	case VDSCRIPTEXPRTYPE_UNARY_POSSIGN:
541	case VDSCRIPTEXPRTYPE_UNARY_NEGSIGN:
542	case VDSCRIPTEXPRTYPE_UNARY_INVERT:
543	case VDSCRIPTEXPRTYPE_UNARY_NEGATE:
544	case VDSCRIPTEXPRTYPE_MULTIPLICATION:
545	case VDSCRIPTEXPRTYPE_DIVISION:
546	case VDSCRIPTEXPRTYPE_MODULUS:
547	case VDSCRIPTEXPRTYPE_ADDITION:
548	case VDSCRIPTEXPRTYPE_SUBTRACTION:
549	case VDSCRIPTEXPRTYPE_LSR:
550	case VDSCRIPTEXPRTYPE_LSL:
551	case VDSCRIPTEXPRTYPE_LOWER:
552	case VDSCRIPTEXPRTYPE_HIGHER:
553	case VDSCRIPTEXPRTYPE_LOWEREQUAL:
554	case VDSCRIPTEXPRTYPE_HIGHEREQUAL:
555	case VDSCRIPTEXPRTYPE_EQUAL:
556	case VDSCRIPTEXPRTYPE_NOTEQUAL:
557	case VDSCRIPTEXPRTYPE_BITWISE_AND:
558	case VDSCRIPTEXPRTYPE_BITWISE_XOR:
559	case VDSCRIPTEXPRTYPE_BITWISE_OR:
560	case VDSCRIPTEXPRTYPE_LOGICAL_AND:
561	case VDSCRIPTEXPRTYPE_LOGICAL_OR:
562	case VDSCRIPTEXPRTYPE_ASSIGN:
563	case VDSCRIPTEXPRTYPE_ASSIGN_MULT:
564	case VDSCRIPTEXPRTYPE_ASSIGN_DIV:
565	case VDSCRIPTEXPRTYPE_ASSIGN_MOD:
566	case VDSCRIPTEXPRTYPE_ASSIGN_ADD:
567	case VDSCRIPTEXPRTYPE_ASSIGN_SUB:
568	case VDSCRIPTEXPRTYPE_ASSIGN_LSL:
569	case VDSCRIPTEXPRTYPE_ASSIGN_LSR:
570	case VDSCRIPTEXPRTYPE_ASSIGN_AND:
571	case VDSCRIPTEXPRTYPE_ASSIGN_XOR:
572	case VDSCRIPTEXPRTYPE_ASSIGN_OR:
573	case VDSCRIPTEXPRTYPE_ASSIGNMENT_LIST:
574	AssertMsgFailed(("TODO\n"));
575	RT_FALL_THRU();
576	default:
577	AssertMsgFailed(("Invalid expression type: %d\n", pExpr->enmType));
578	}
579	return rc;
580	}
581
582	/**
583	* Evaluate a statement.
584	*
585	* @returns VBox status code.
586	* @param pThis The interpreter context.
587	* @param pStmt The statement to evaluate.
588	*/
589	static int vdScriptInterpreterEvaluateStatement(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
590	{
591	int rc = VINF_SUCCESS;
592
593	switch (pStmt->enmStmtType)
594	{
595	case VDSCRIPTSTMTTYPE_COMPOUND:
596	{
597	/* Setup new scope. */
598	rc = vdScriptInterpreterScopeCreate(pThis);
599	if (RT_SUCCESS(rc))
600	{
601	/** @todo Declarations */
602	rc = vdScriptInterpreterPushCompoundCtrlEntry(pThis, pStmt);
603	}
604	break;
605	}
606	case VDSCRIPTSTMTTYPE_EXPRESSION:
607	{
608	rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->pExpr->Core);
609	break;
610	}
611	case VDSCRIPTSTMTTYPE_IF:
612	{
613	rc = vdScriptInterpreterPushIfCtrlEntry(pThis, pStmt);
614	break;
615	}
616	case VDSCRIPTSTMTTYPE_SWITCH:
617	AssertMsgFailed(("TODO\n"));
618	break;
619	case VDSCRIPTSTMTTYPE_WHILE:
620	{
621	rc = vdScriptInterpreterPushWhileCtrlEntry(pThis, pStmt);
622	break;
623	}
624	case VDSCRIPTSTMTTYPE_RETURN:
625	{
626	/* Walk up the control stack until we reach a function cleanup entry. */
627	PVDSCRIPTINTERPCTRL pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
628	while ( pCtrl
629	&& ( pCtrl->fEvalAst
630	\|\| pCtrl->Ctrl.enmCtrlType != VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP))
631	{
632	/* Cleanup up any compound statement scope. */
633	if ( !pCtrl->fEvalAst
634	&& pCtrl->Ctrl.enmCtrlType == VDSCRIPTINTERPCTRLTYPE_COMPOUND)
635	vdScriptInterpreterScopeDestroyCurr(pThis);
636
637	vdScriptStackPop(&pThis->StackCtrl);
638	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
639	}
640	AssertMsg(VALID_PTR(pCtrl), ("Incorrect program, return outside of function\n"));
641	break;
642	}
643	case VDSCRIPTSTMTTYPE_FOR:
644	{
645	rc = vdScriptInterpreterPushForCtrlEntry(pThis, pStmt);
646	break;
647	}
648	case VDSCRIPTSTMTTYPE_CONTINUE:
649	{
650	/* Remove everything up to a loop control entry. */
651	PVDSCRIPTINTERPCTRL pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
652	while ( pCtrl
653	&& ( pCtrl->fEvalAst
654	\|\| pCtrl->Ctrl.enmCtrlType != VDSCRIPTINTERPCTRLTYPE_LOOP))
655	{
656	/* Cleanup up any compound statement scope. */
657	if ( !pCtrl->fEvalAst
658	&& pCtrl->Ctrl.enmCtrlType == VDSCRIPTINTERPCTRLTYPE_COMPOUND)
659	vdScriptInterpreterScopeDestroyCurr(pThis);
660
661	vdScriptStackPop(&pThis->StackCtrl);
662	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
663	}
664	AssertMsg(VALID_PTR(pCtrl), ("Incorrect program, continue outside of loop\n"));
665
666	/* Put the conditionals for while and for loops onto the control stack again. */
667	PVDSCRIPTASTSTMT pLoopStmt = (PVDSCRIPTASTSTMT)pCtrl->Ctrl.pAstNode;
668
669	AssertMsg( pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_WHILE
670	\|\| pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_FOR,
671	("Invalid statement type, must be for or while loop\n"));
672
673	if (pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_FOR)
674	rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pExprCond->Core);
675	else if (!pLoopStmt->While.fDoWhile)
676	rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->While.pCond->Core);
677	break;
678	}
679	case VDSCRIPTSTMTTYPE_BREAK:
680	{
681	/* Remove everything including the loop control statement. */
682	PVDSCRIPTINTERPCTRL pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
683	while ( pCtrl
684	&& ( pCtrl->fEvalAst
685	\|\| pCtrl->Ctrl.enmCtrlType != VDSCRIPTINTERPCTRLTYPE_LOOP))
686	{
687	/* Cleanup up any compound statement scope. */
688	if ( !pCtrl->fEvalAst
689	&& pCtrl->Ctrl.enmCtrlType == VDSCRIPTINTERPCTRLTYPE_COMPOUND)
690	vdScriptInterpreterScopeDestroyCurr(pThis);
691
692	vdScriptStackPop(&pThis->StackCtrl);
693	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
694	}
695	AssertMsg(VALID_PTR(pCtrl), ("Incorrect program, break outside of loop\n"));
696	vdScriptStackPop(&pThis->StackCtrl); /* Remove loop control statement. */
697	break;
698	}
699	case VDSCRIPTSTMTTYPE_CASE:
700	case VDSCRIPTSTMTTYPE_DEFAULT:
701	AssertMsgFailed(("TODO\n"));
702	break;
703	default:
704	AssertMsgFailed(("Invalid statement type: %d\n", pStmt->enmStmtType));
705	}
706
707	return rc;
708	}
709
710	/**
711	* Evaluates the given AST node.
712	*
713	* @returns VBox statuse code.
714	* @param pThis The interpreter context.
715	* @param pAstNode The AST node to interpret.
716	*/
717	static int vdScriptInterpreterEvaluateAst(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTCORE pAstNode)
718	{
719	int rc = VERR_NOT_IMPLEMENTED;
720
721	switch (pAstNode->enmClass)
722	{
723	case VDSCRIPTASTCLASS_DECLARATION:
724	{
725	AssertMsgFailed(("TODO\n"));
726	break;
727	}
728	case VDSCRIPTASTCLASS_STATEMENT:
729	{
730	rc = vdScriptInterpreterEvaluateStatement(pThis, (PVDSCRIPTASTSTMT)pAstNode);
731	break;
732	}
733	case VDSCRIPTASTCLASS_EXPRESSION:
734	{
735	rc = vdScriptInterpreterEvaluateExpression(pThis, (PVDSCRIPTASTEXPR)pAstNode);
736	break;
737	}
738	/* These should never ever appear here. */
739	case VDSCRIPTASTCLASS_IDENTIFIER:
740	case VDSCRIPTASTCLASS_FUNCTION:
741	case VDSCRIPTASTCLASS_FUNCTIONARG:
742	case VDSCRIPTASTCLASS_INVALID:
743	default:
744	AssertMsgFailed(("Invalid AST node class: %d\n", pAstNode->enmClass));
745	}
746
747	return rc;
748	}
749
750	/**
751	* Evaluate a function call.
752	*
753	* @returns VBox status code.
754	* @param pThis The interpreter context.
755	* @param pFn The function execute.
756	*/
757	static int vdScriptInterpreterFnCall(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTFN pFn)
758	{
759	int rc = VINF_SUCCESS;
760
761	if (!pFn->fExternal)
762	{
763	PVDSCRIPTASTFN pAstFn = pFn->Type.Internal.pAstFn;
764
765	/* Add function call cleanup marker on the stack first. */
766	rc = vdScriptInterpreterPushNonDataCtrlEntry(pThis, VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP);
767	if (RT_SUCCESS(rc))
768	{
769	/* Create function call frame and set it up. */
770	PVDSCRIPTINTERPFNCALL pFnCall = (PVDSCRIPTINTERPFNCALL)RTMemAllocZ(sizeof(VDSCRIPTINTERPFNCALL));
771	if (pFnCall)
772	{
773	pFnCall->pCaller = pThis->pFnCallCurr;
774	pFnCall->ScopeRoot.pParent = NULL;
775	pFnCall->ScopeRoot.hStrSpaceVar = NULL;
776	pFnCall->pScopeCurr = &pFnCall->ScopeRoot;
777
778	/* Add the variables, remember order. The first variable in the argument has the value at the top of the value stack. */
779	PVDSCRIPTASTFNARG pArg = RTListGetFirst(&pAstFn->ListArgs, VDSCRIPTASTFNARG, Core.ListNode);
780	for (unsigned i = 0; i < pAstFn->cArgs; i++)
781	{
782	PVDSCRIPTINTERPVAR pVar = (PVDSCRIPTINTERPVAR)RTMemAllocZ(sizeof(VDSCRIPTINTERPVAR));
783	if (pVar)
784	{
785	pVar->Core.pszString = pArg->pArgIde->aszIde;
786	pVar->Core.cchString = pArg->pArgIde->cchIde;
787	vdScriptInterpreterPopValue(pThis, &pVar->Value);
788	bool fInserted = RTStrSpaceInsert(&pFnCall->ScopeRoot.hStrSpaceVar, &pVar->Core);
789	Assert(fInserted); RT_NOREF_PV(fInserted);
790	}
791	else
792	{
793	rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory creating a variable");
794	break;
795	}
796	pArg = RTListGetNext(&pAstFn->ListArgs, pArg, VDSCRIPTASTFNARG, Core.ListNode);
797	}
798
799	if (RT_SUCCESS(rc))
800	{
801	/*
802	* Push compount statement on the control stack and make the newly created
803	* call frame the current one.
804	*/
805	rc = vdScriptInterpreterPushAstEntry(pThis, &pAstFn->pCompoundStmts->Core);
806	if (RT_SUCCESS(rc))
807	pThis->pFnCallCurr = pFnCall;
808	}
809
810	if (RT_FAILURE(rc))
811	{
812	RTStrSpaceDestroy(&pFnCall->ScopeRoot.hStrSpaceVar, vdScriptInterpreterVarSpaceDestroy, NULL);
813	RTMemFree(pFnCall);
814	}
815	}
816	else
817	rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory creating a call frame");
818	}
819	}
820	else
821	{
822	/* External function call, build the argument list. */
823	if (pFn->cArgs)
824	{
825	PVDSCRIPTARG paArgs = (PVDSCRIPTARG)RTMemAllocZ(pFn->cArgs * sizeof(VDSCRIPTARG));
826	if (paArgs)
827	{
828	for (unsigned i = 0; i < pFn->cArgs; i++)
829	vdScriptInterpreterPopValue(pThis, &paArgs[i]);
830
831	rc = pFn->Type.External.pfnCallback(paArgs, pFn->Type.External.pvUser);
832	RTMemFree(paArgs);
833	}
834	else
835	rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS,
836	"Out of memory creating argument array for external function call");
837	}
838	else
839	rc = pFn->Type.External.pfnCallback(NULL, pFn->Type.External.pvUser);
840	}
841
842	return rc;
843	}
844
845	/**
846	* Evaluate interpreter control statement.
847	*
848	* @returns VBox status code.
849	* @param pThis The interpreter context.
850	* @param pCtrl The control entry to evaluate.
851	*/
852	static int vdScriptInterpreterEvaluateCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTINTERPCTRL pCtrl)
853	{
854	int rc = VINF_SUCCESS;
855
856	Assert(!pCtrl->fEvalAst);
857	switch (pCtrl->Ctrl.enmCtrlType)
858	{
859	case VDSCRIPTINTERPCTRLTYPE_FN_CALL:
860	{
861	PVDSCRIPTFN pFn = pCtrl->Ctrl.FnCall.pFn;
862
863	vdScriptStackPop(&pThis->StackCtrl);
864	rc = vdScriptInterpreterFnCall(pThis, pFn);
865	break;
866	}
867	case VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP:
868	{
869	vdScriptStackPop(&pThis->StackCtrl);
870
871	/* Delete function call entry. */
872	AssertPtr(pThis->pFnCallCurr);
873	PVDSCRIPTINTERPFNCALL pFnCallFree = pThis->pFnCallCurr;
874
875	pThis->pFnCallCurr = pFnCallFree->pCaller;
876	Assert(pFnCallFree->pScopeCurr == &pFnCallFree->ScopeRoot);
877	RTStrSpaceDestroy(&pFnCallFree->ScopeRoot.hStrSpaceVar, vdScriptInterpreterVarSpaceDestroy, NULL);
878	RTMemFree(pFnCallFree);
879	break;
880	}
881	case VDSCRIPTINTERPCTRLTYPE_COMPOUND:
882	{
883	if (!pCtrl->Ctrl.Compound.pStmtCurr)
884	{
885	/* Evaluated last statement, cleanup and remove the control statement from the stack. */
886	vdScriptInterpreterScopeDestroyCurr(pThis);
887	vdScriptStackPop(&pThis->StackCtrl);
888	}
889	else
890	{
891	/* Push the current statement onto the control stack and move on. */
892	rc = vdScriptInterpreterPushAstEntry(pThis, &pCtrl->Ctrl.Compound.pStmtCurr->Core);
893	if (RT_SUCCESS(rc))
894	{
895	pCtrl->Ctrl.Compound.pStmtCurr = RTListGetNext(&pCtrl->Ctrl.Compound.pStmtCompound->Compound.ListStmts,
896	pCtrl->Ctrl.Compound.pStmtCurr, VDSCRIPTASTSTMT, Core.ListNode);
897	}
898	}
899	break;
900	}
901	case VDSCRIPTINTERPCTRLTYPE_LOOP:
902	{
903	PVDSCRIPTASTSTMT pLoopStmt = (PVDSCRIPTASTSTMT)pCtrl->Ctrl.pAstNode;
904
905	/* Check whether the condition passed. */
906	VDSCRIPTARG Cond;
907	vdScriptInterpreterPopValue(pThis, &Cond);
908	AssertMsg(Cond.enmType == VDSCRIPTTYPE_BOOL,
909	("Value on stack is not of boolean type\n"));
910
911	if (Cond.f)
912	{
913	/* Execute the loop another round. */
914	if (pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_WHILE)
915	{
916	rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->While.pCond->Core);
917	if (RT_SUCCESS(rc))
918	{
919	rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->While.pStmt->Core);
920	if (RT_FAILURE(rc))
921	vdScriptStackPop(&pThis->StackCtrl);
922	}
923	}
924	else
925	{
926	AssertMsg(pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_FOR,
927	("Not a for statement\n"));
928
929	rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pExprCond->Core);
930	if (RT_SUCCESS(rc))
931	{
932	rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pExpr3->Core);
933	if (RT_SUCCESS(rc))
934	{
935	rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pStmt->Core);
936	if (RT_FAILURE(rc))
937	vdScriptStackPop(&pThis->StackCtrl);
938	}
939
940	if (RT_FAILURE(rc))
941	vdScriptStackPop(&pThis->StackCtrl);
942	}
943	}
944	}
945	else
946	vdScriptStackPop(&pThis->StackCtrl); /* Remove loop control statement. */
947	break;
948	}
949	case VDSCRIPTINTERPCTRLTYPE_IF:
950	{
951	PVDSCRIPTASTSTMT pIfStmt = (PVDSCRIPTASTSTMT)pCtrl->Ctrl.pAstNode;
952
953	vdScriptStackPop(&pThis->StackCtrl); /* Remove if control statement. */
954
955	/* Check whether the condition passed. */
956	VDSCRIPTARG Cond;
957	vdScriptInterpreterPopValue(pThis, &Cond);
958	AssertMsg(Cond.enmType == VDSCRIPTTYPE_BOOL,
959	("Value on stack is not of boolean type\n"));
960
961	if (Cond.f)
962	{
963	/* Execute the true branch. */
964	rc = vdScriptInterpreterPushAstEntry(pThis, &pIfStmt->If.pTrueStmt->Core);
965	}
966	else if (pIfStmt->If.pElseStmt)
967	rc = vdScriptInterpreterPushAstEntry(pThis, &pIfStmt->If.pElseStmt->Core);
968
969	break;
970	}
971	default:
972	AssertMsgFailed(("Invalid evaluation control type on the stack: %d\n",
973	pCtrl->Ctrl.enmCtrlType));
974	}
975
976	return rc;
977	}
978
979	/**
980	* The interpreter evaluation core loop.
981	*
982	* @returns VBox status code.
983	* @param pThis The interpreter context.
984	*/
985	static int vdScriptInterpreterEvaluate(PVDSCRIPTINTERPCTX pThis)
986	{
987	int rc = VINF_SUCCESS;
988	PVDSCRIPTINTERPCTRL pCtrl = NULL;
989
990	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
991	while (pCtrl)
992	{
993	if (pCtrl->fEvalAst)
994	{
995	PVDSCRIPTASTCORE pAstNode = pCtrl->pAstNode;
996	vdScriptStackPop(&pThis->StackCtrl);
997
998	rc = vdScriptInterpreterEvaluateAst(pThis, pAstNode);
999	}
1000	else
1001	rc = vdScriptInterpreterEvaluateCtrlEntry(pThis, pCtrl);
1002
1003	pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
1004	}
1005
1006	return rc;
1007	}
1008
1009	DECLHIDDEN(int) vdScriptCtxInterprete(PVDSCRIPTCTXINT pThis, const char *pszFn,
1010	PVDSCRIPTARG paArgs, unsigned cArgs,
1011	PVDSCRIPTARG pRet)
1012	{
1013	RT_NOREF1(pRet);
1014	int rc = VINF_SUCCESS;
1015	VDSCRIPTINTERPCTX InterpCtx;
1016	PVDSCRIPTFN pFn = NULL;
1017
1018	AssertPtrReturn(pThis, VERR_INVALID_POINTER);
1019	AssertPtrReturn(pszFn, VERR_INVALID_POINTER);
1020	AssertReturn( (!cArgs && !paArgs)
1021	\|\| (cArgs && paArgs), VERR_INVALID_PARAMETER);
1022
1023	InterpCtx.pScriptCtx = pThis;
1024	InterpCtx.pFnCallCurr = NULL;
1025	vdScriptStackInit(&InterpCtx.StackValues, sizeof(VDSCRIPTARG));
1026	vdScriptStackInit(&InterpCtx.StackCtrl, sizeof(VDSCRIPTINTERPCTRL));
1027
1028	pFn = (PVDSCRIPTFN)RTStrSpaceGet(&pThis->hStrSpaceFn, pszFn);
1029	if (pFn)
1030	{
1031	if (cArgs == pFn->cArgs)
1032	{
1033	/* Push the arguments onto the stack. */
1034	/** @todo Check expected and given argument types. */
1035	for (unsigned i = 0; i < cArgs; i++)
1036	{
1037	PVDSCRIPTARG pArg = (PVDSCRIPTARG)vdScriptStackGetUnused(&InterpCtx.StackValues);
1038	*pArg = paArgs[i];
1039	vdScriptStackPush(&InterpCtx.StackValues);
1040	}
1041
1042	if (RT_SUCCESS(rc))
1043	{
1044	/* Setup function call frame and parameters. */
1045	rc = vdScriptInterpreterFnCall(&InterpCtx, pFn);
1046	if (RT_SUCCESS(rc))
1047	{
1048	/* Run the interpreter. */
1049	rc = vdScriptInterpreterEvaluate(&InterpCtx);
1050	vdScriptStackDestroy(&InterpCtx.StackValues);
1051	vdScriptStackDestroy(&InterpCtx.StackCtrl);
1052	}
1053	}
1054	}
1055	else
1056	rc = vdScriptInterpreterError(&InterpCtx, VERR_INVALID_PARAMETER, RT_SRC_POS, "Invalid number of parameters, expected %d got %d", pFn->cArgs, cArgs);
1057	}
1058	else
1059	rc = vdScriptInterpreterError(&InterpCtx, VERR_NOT_FOUND, RT_SRC_POS, "Function with identifier \"%s\" not found", pszFn);
1060
1061
1062	return rc;
1063	}

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source: vbox/trunk/src/VBox/Storage/testcase/VDScriptInterp.cpp@ 85959

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