src/scriptvm/ScriptVM.cpp

/*
 * Copyright (c) 2014 Christian Schoenebeck
 *
 * http://www.linuxsampler.org
 *
 * This file is part of LinuxSampler and released under the same terms.
 * See README file for details.
 */

#include "ScriptVM.h"

#include <string.h>
#include "../common/global_private.h"
#include "tree.h"

#define DEBUG_SCRIPTVM_CORE 0

int InstrScript_parse(LinuxSampler::ParserContext*);

namespace LinuxSampler {

    static void _printIndents(int n) {
        for (int i = 0; i < n; ++i) printf("  ");
        fflush(stdout);
    }

    static int _requiredMaxStackSizeFor(Statement* statement, int depth = 0) {
        if (!statement) return 1;

        switch (statement->statementType()) {
            case STMT_LEAF:
                #if DEBUG_SCRIPTVM_CORE
                _printIndents(depth);
                printf("-> STMT_LEAF\n");
                #endif
                return 1;

            case STMT_LIST: {
                #if DEBUG_SCRIPTVM_CORE
                _printIndents(depth);
                printf("-> STMT_LIST\n");
                #endif
                Statements* stmts = (Statements*) statement;
                int max = 0;
                for (int i = 0; stmts->statement(i); ++i) {
                    int size = _requiredMaxStackSizeFor( stmts->statement(i), depth+1 );
                    if (max < size) max = size;
                }
                return max + 1;
            }

            case STMT_BRANCH: {
                #if DEBUG_SCRIPTVM_CORE
                _printIndents(depth);
                printf("-> STMT_BRANCH\n");
                #endif
                BranchStatement* branchStmt = (BranchStatement*) statement;
                int max = 0;
                for (int i = 0; branchStmt->branch(i); ++i) {
                    int size = _requiredMaxStackSizeFor( branchStmt->branch(i), depth+1 );
                    if (max < size) max = size;
                }
                return max + 1;
            }

            case STMT_LOOP: {
                #if DEBUG_SCRIPTVM_CORE
                _printIndents(depth);
                printf("-> STMT_LOOP\n");
                #endif
                While* whileStmt = (While*) statement;
                if (whileStmt->statements())
                    return _requiredMaxStackSizeFor( whileStmt->statements() ) + 1;
                else
                    return 1;
            }
        }

        return 1; // actually just to avoid compiler warning
    }

    static int _requiredMaxStackSizeFor(EventHandlers* handlers) {
        int max = 1;
        for (int i = 0; i < handlers->size(); ++i) {
            int size = _requiredMaxStackSizeFor(handlers->eventHandler(i));
            if (max < size) max = size;
        }
        return max;
    }

    ScriptVM::ScriptVM() : m_parserContext(NULL), fnWait(this) {
    }

    ScriptVM::~ScriptVM() {
    }

    VMParserContext* ScriptVM::loadScript(const String& s) {
        std::istringstream iss(s);
        return loadScript(&iss);
    }
    
    VMParserContext* ScriptVM::loadScript(std::istream* is) {
        ParserContext* context = new ParserContext(this);
        //printf("parserCtx=0x%lx\n", (uint64_t)context);
        
        context->createScanner(is);

        InstrScript_parse(context);
        std::cout << "Allocating " << context->globalIntVarCount * sizeof(int) << " bytes of global int VM memory.\n";
        std::cout << "Allocating " << context->globalStrVarCount << " of global VM string variables.\n";
        if (!context->globalIntMemory)
            context->globalIntMemory = new ArrayList<int>();
        if (!context->globalStrMemory)
            context->globalStrMemory = new ArrayList<String>();
        context->globalIntMemory->resize(context->globalIntVarCount);
        memset(&((*context->globalIntMemory)[0]), 0, context->globalIntVarCount * sizeof(int));
        
        context->globalStrMemory->resize(context->globalStrVarCount);

        context->destroyScanner();

        return context;
    }

    void ScriptVM::dumpParsedScript(VMParserContext* context) {
        ParserContext* ctx = dynamic_cast<ParserContext*>(context);
        if (!ctx) {
            std::cerr << "No VM context. So nothing to dump.\n";
            return;
        }
        if (!ctx->handlers) {
            std::cerr << "No event handlers defined in script. So nothing to dump.\n";
            return;
        }
        if (!ctx->globalIntMemory) {
            std::cerr << "Internal error: no global memory assigend to script VM.\n";
            return;
        }
        ctx->handlers->dump();
    }

    VMExecContext* ScriptVM::createExecContext(VMParserContext* parserContext) {
        ParserContext* parserCtx = dynamic_cast<ParserContext*>(parserContext);
        ExecContext* execCtx = new ExecContext();
        
        if (parserCtx->requiredMaxStackSize < 0) {
             parserCtx->requiredMaxStackSize =
                _requiredMaxStackSizeFor(&*parserCtx->handlers);
        }
        execCtx->stack.resize(parserCtx->requiredMaxStackSize);
        std::cout << "Created VM exec context with "
                  << parserCtx->requiredMaxStackSize * sizeof(ExecContext::StackFrame)
                  << " bytes VM stack size.\n";
        //printf("execCtx=0x%lx\n", (uint64_t)execCtx);
        const int polySize = parserCtx->polyphonicIntVarCount;
        execCtx->polyphonicIntMemory.resize(polySize);
        memset(&execCtx->polyphonicIntMemory[0], 0, polySize * sizeof(int));

        std::cout << "Allocated " << polySize * sizeof(int)
                  << " bytes polyphonic memory.\n";
        return execCtx;
    }

    VMFunction* ScriptVM::functionByName(const String& name) {
        if (name == "message") return &fnMessage;
        else if (name == "exit") return &fnExit;
        else if (name == "wait") return &fnWait;
        return NULL;
    }

    VMParserContext* ScriptVM::currentVMParserContext() {
        return m_parserContext;
    }

    VMExecContext* ScriptVM::currentVMExecContext() {
        if (!m_parserContext) return NULL;
        return m_parserContext->execContext;
    }

    VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {
        m_parserContext = dynamic_cast<ParserContext*>(parserContext);
        if (!m_parserContext) {
            std::cerr << "No VM parser context provided. Did you load a script?.\n";
            return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR);
        }

        ExecContext* ctx = dynamic_cast<ExecContext*>(execContex);
        if (!ctx) {
            std::cerr << "Invalid VM exec context.\n";
            return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR);
        }
        EventHandler* h = dynamic_cast<EventHandler*>(handler);
        if (!h) return VM_EXEC_NOT_RUNNING;

        m_parserContext->execContext = ctx;

        ctx->status = VM_EXEC_RUNNING;
        StmtFlags_t flags = STMT_SUCCESS;

        int& frameIdx = ctx->stackFrame;
        if (frameIdx < 0) { // start condition ...
            frameIdx = -1;
            ctx->pushStack(h);
        }

        while (flags == STMT_SUCCESS && frameIdx >= 0) {
            if (frameIdx >= ctx->stack.size()) { // should never happen, otherwise it's a bug ...
                std::cerr << "CRITICAL: VM stack overflow! (" << frameIdx << ")\n";
                flags = StmtFlags_t(STMT_ABORT_SIGNALLED | STMT_ERROR_OCCURRED);
                break;
            }

            ExecContext::StackFrame& frame = ctx->stack[frameIdx];
            switch (frame.statement->statementType()) {
                case STMT_LEAF: {
                    #if DEBUG_SCRIPTVM_CORE
                    _printIndents(frameIdx);
                    printf("-> STMT_LEAF\n");
                    #endif
                    LeafStatement* leaf = (LeafStatement*) frame.statement;
                    flags = leaf->exec();
                    ctx->popStack();
                    break;
                }

                case STMT_LIST: {
                    #if DEBUG_SCRIPTVM_CORE
                    _printIndents(frameIdx);
                    printf("-> STMT_LIST subidx=%d\n", frame.subindex);
                    #endif
                    Statements* stmts = (Statements*) frame.statement;
                    if (stmts->statement(frame.subindex)) {
                        ctx->pushStack(
                            stmts->statement(frame.subindex++)
                        );
                    } else {
                        #if DEBUG_SCRIPTVM_CORE
                        _printIndents(frameIdx);
                        printf("[END OF LIST] subidx=%d\n", frame.subindex);
                        #endif
                        ctx->popStack();
                    }
                    break;
                }

                case STMT_BRANCH: {
                    #if DEBUG_SCRIPTVM_CORE
                    _printIndents(frameIdx);
                    printf("-> STMT_BRANCH\n");
                    #endif
                    if (frame.subindex < 0) ctx->popStack();
                    else {
                        BranchStatement* branchStmt = (BranchStatement*) frame.statement;
                        frame.subindex = branchStmt->evalBranch();
                        if (frame.subindex >= 0) {
                            ctx->pushStack(
                                branchStmt->branch(frame.subindex)
                            );
                            frame.subindex = -1;
                        } else ctx->popStack();
                    }
                    break;
                }

                case STMT_LOOP: {
                    #if DEBUG_SCRIPTVM_CORE
                    _printIndents(frameIdx);
                    printf("-> STMT_LOOP\n");
                    #endif
                    While* whileStmt = (While*) frame.statement;
                    if (whileStmt->evalLoopStartCondition() && whileStmt->statements()) {
                        ctx->pushStack(
                            whileStmt->statements()
                        );
                    } else ctx->popStack();
                }
            }
        }

        if (flags & STMT_SUSPEND_SIGNALLED) {
            ctx->status = VM_EXEC_SUSPENDED;
        } else {
            ctx->status = VM_EXEC_NOT_RUNNING;
            if (flags & STMT_ERROR_OCCURRED)
                ctx->status = VM_EXEC_ERROR;
            ctx->reset();
        }

        m_parserContext->execContext = NULL;
        m_parserContext = NULL;
        return ctx->status;
    }

} // namespace LinuxSampler
1	/*
2	* Copyright (c) 2014 Christian Schoenebeck
3	*
4	* http://www.linuxsampler.org
5	*
6	* This file is part of LinuxSampler and released under the same terms.
7	* See README file for details.
8	*/
9
10	#include "ScriptVM.h"
11
12	#include <string.h>
13	#include "../common/global_private.h"
14	#include "tree.h"
15
16	#define DEBUG_SCRIPTVM_CORE 0
17
18	int InstrScript_parse(LinuxSampler::ParserContext*);
19
20	namespace LinuxSampler {
21
22	static void _printIndents(int n) {
23	for (int i = 0; i < n; ++i) printf(" ");
24	fflush(stdout);
25	}
26
27	static int _requiredMaxStackSizeFor(Statement* statement, int depth = 0) {
28	if (!statement) return 1;
29
30	switch (statement->statementType()) {
31	case STMT_LEAF:
32	#if DEBUG_SCRIPTVM_CORE
33	_printIndents(depth);
34	printf("-> STMT_LEAF\n");
35	#endif
36	return 1;
37
38	case STMT_LIST: {
39	#if DEBUG_SCRIPTVM_CORE
40	_printIndents(depth);
41	printf("-> STMT_LIST\n");
42	#endif
43	Statements* stmts = (Statements*) statement;
44	int max = 0;
45	for (int i = 0; stmts->statement(i); ++i) {
46	int size = _requiredMaxStackSizeFor( stmts->statement(i), depth+1 );
47	if (max < size) max = size;
48	}
49	return max + 1;
50	}
51
52	case STMT_BRANCH: {
53	#if DEBUG_SCRIPTVM_CORE
54	_printIndents(depth);
55	printf("-> STMT_BRANCH\n");
56	#endif
57	BranchStatement* branchStmt = (BranchStatement*) statement;
58	int max = 0;
59	for (int i = 0; branchStmt->branch(i); ++i) {
60	int size = _requiredMaxStackSizeFor( branchStmt->branch(i), depth+1 );
61	if (max < size) max = size;
62	}
63	return max + 1;
64	}
65
66	case STMT_LOOP: {
67	#if DEBUG_SCRIPTVM_CORE
68	_printIndents(depth);
69	printf("-> STMT_LOOP\n");
70	#endif
71	While* whileStmt = (While*) statement;
72	if (whileStmt->statements())
73	return _requiredMaxStackSizeFor( whileStmt->statements() ) + 1;
74	else
75	return 1;
76	}
77	}
78
79	return 1; // actually just to avoid compiler warning
80	}
81
82	static int _requiredMaxStackSizeFor(EventHandlers* handlers) {
83	int max = 1;
84	for (int i = 0; i < handlers->size(); ++i) {
85	int size = _requiredMaxStackSizeFor(handlers->eventHandler(i));
86	if (max < size) max = size;
87	}
88	return max;
89	}
90
91	ScriptVM::ScriptVM() : m_parserContext(NULL), fnWait(this) {
92	}
93
94	ScriptVM::~ScriptVM() {
95	}
96
97	VMParserContext* ScriptVM::loadScript(const String& s) {
98	std::istringstream iss(s);
99	return loadScript(&iss);
100	}
101
102	VMParserContext* ScriptVM::loadScript(std::istream* is) {
103	ParserContext* context = new ParserContext(this);
104	//printf("parserCtx=0x%lx\n", (uint64_t)context);
105
106	context->createScanner(is);
107
108	InstrScript_parse(context);
109	std::cout << "Allocating " << context->globalIntVarCount * sizeof(int) << " bytes of global int VM memory.\n";
110	std::cout << "Allocating " << context->globalStrVarCount << " of global VM string variables.\n";
111	if (!context->globalIntMemory)
112	context->globalIntMemory = new ArrayList<int>();
113	if (!context->globalStrMemory)
114	context->globalStrMemory = new ArrayList<String>();
115	context->globalIntMemory->resize(context->globalIntVarCount);
116	memset(&((context->globalIntMemory)[0]), 0, context->globalIntVarCount sizeof(int));
117
118	context->globalStrMemory->resize(context->globalStrVarCount);
119
120	context->destroyScanner();
121
122	return context;
123	}
124
125	void ScriptVM::dumpParsedScript(VMParserContext* context) {
126	ParserContext* ctx = dynamic_cast<ParserContext*>(context);
127	if (!ctx) {
128	std::cerr << "No VM context. So nothing to dump.\n";
129	return;
130	}
131	if (!ctx->handlers) {
132	std::cerr << "No event handlers defined in script. So nothing to dump.\n";
133	return;
134	}
135	if (!ctx->globalIntMemory) {
136	std::cerr << "Internal error: no global memory assigend to script VM.\n";
137	return;
138	}
139	ctx->handlers->dump();
140	}
141
142	VMExecContext* ScriptVM::createExecContext(VMParserContext* parserContext) {
143	ParserContext* parserCtx = dynamic_cast<ParserContext*>(parserContext);
144	ExecContext* execCtx = new ExecContext();
145
146	if (parserCtx->requiredMaxStackSize < 0) {
147	parserCtx->requiredMaxStackSize =
148	_requiredMaxStackSizeFor(&*parserCtx->handlers);
149	}
150	execCtx->stack.resize(parserCtx->requiredMaxStackSize);
151	std::cout << "Created VM exec context with "
152	<< parserCtx->requiredMaxStackSize * sizeof(ExecContext::StackFrame)
153	<< " bytes VM stack size.\n";
154	//printf("execCtx=0x%lx\n", (uint64_t)execCtx);
155	const int polySize = parserCtx->polyphonicIntVarCount;
156	execCtx->polyphonicIntMemory.resize(polySize);
157	memset(&execCtx->polyphonicIntMemory[0], 0, polySize * sizeof(int));
158
159	std::cout << "Allocated " << polySize * sizeof(int)
160	<< " bytes polyphonic memory.\n";
161	return execCtx;
162	}
163
164	VMFunction* ScriptVM::functionByName(const String& name) {
165	if (name == "message") return &fnMessage;
166	else if (name == "exit") return &fnExit;
167	else if (name == "wait") return &fnWait;
168	return NULL;
169	}
170
171	VMParserContext* ScriptVM::currentVMParserContext() {
172	return m_parserContext;
173	}
174
175	VMExecContext* ScriptVM::currentVMExecContext() {
176	if (!m_parserContext) return NULL;
177	return m_parserContext->execContext;
178	}
179
180	VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {
181	m_parserContext = dynamic_cast<ParserContext*>(parserContext);
182	if (!m_parserContext) {
183	std::cerr << "No VM parser context provided. Did you load a script?.\n";
184	return VMExecStatus_t(VM_EXEC_NOT_RUNNING \| VM_EXEC_ERROR);
185	}
186
187	ExecContext* ctx = dynamic_cast<ExecContext*>(execContex);
188	if (!ctx) {
189	std::cerr << "Invalid VM exec context.\n";
190	return VMExecStatus_t(VM_EXEC_NOT_RUNNING \| VM_EXEC_ERROR);
191	}
192	EventHandler* h = dynamic_cast<EventHandler*>(handler);
193	if (!h) return VM_EXEC_NOT_RUNNING;
194
195	m_parserContext->execContext = ctx;
196
197	ctx->status = VM_EXEC_RUNNING;
198	StmtFlags_t flags = STMT_SUCCESS;
199
200	int& frameIdx = ctx->stackFrame;
201	if (frameIdx < 0) { // start condition ...
202	frameIdx = -1;
203	ctx->pushStack(h);
204	}
205
206	while (flags == STMT_SUCCESS && frameIdx >= 0) {
207	if (frameIdx >= ctx->stack.size()) { // should never happen, otherwise it's a bug ...
208	std::cerr << "CRITICAL: VM stack overflow! (" << frameIdx << ")\n";
209	flags = StmtFlags_t(STMT_ABORT_SIGNALLED \| STMT_ERROR_OCCURRED);
210	break;
211	}
212
213	ExecContext::StackFrame& frame = ctx->stack[frameIdx];
214	switch (frame.statement->statementType()) {
215	case STMT_LEAF: {
216	#if DEBUG_SCRIPTVM_CORE
217	_printIndents(frameIdx);
218	printf("-> STMT_LEAF\n");
219	#endif
220	LeafStatement* leaf = (LeafStatement*) frame.statement;
221	flags = leaf->exec();
222	ctx->popStack();
223	break;
224	}
225
226	case STMT_LIST: {
227	#if DEBUG_SCRIPTVM_CORE
228	_printIndents(frameIdx);
229	printf("-> STMT_LIST subidx=%d\n", frame.subindex);
230	#endif
231	Statements* stmts = (Statements*) frame.statement;
232	if (stmts->statement(frame.subindex)) {
233	ctx->pushStack(
234	stmts->statement(frame.subindex++)
235	);
236	} else {
237	#if DEBUG_SCRIPTVM_CORE
238	_printIndents(frameIdx);
239	printf("[END OF LIST] subidx=%d\n", frame.subindex);
240	#endif
241	ctx->popStack();
242	}
243	break;
244	}
245
246	case STMT_BRANCH: {
247	#if DEBUG_SCRIPTVM_CORE
248	_printIndents(frameIdx);
249	printf("-> STMT_BRANCH\n");
250	#endif
251	if (frame.subindex < 0) ctx->popStack();
252	else {
253	BranchStatement* branchStmt = (BranchStatement*) frame.statement;
254	frame.subindex = branchStmt->evalBranch();
255	if (frame.subindex >= 0) {
256	ctx->pushStack(
257	branchStmt->branch(frame.subindex)
258	);
259	frame.subindex = -1;
260	} else ctx->popStack();
261	}
262	break;
263	}
264
265	case STMT_LOOP: {
266	#if DEBUG_SCRIPTVM_CORE
267	_printIndents(frameIdx);
268	printf("-> STMT_LOOP\n");
269	#endif
270	While* whileStmt = (While*) frame.statement;
271	if (whileStmt->evalLoopStartCondition() && whileStmt->statements()) {
272	ctx->pushStack(
273	whileStmt->statements()
274	);
275	} else ctx->popStack();
276	}
277	}
278	}
279
280	if (flags & STMT_SUSPEND_SIGNALLED) {
281	ctx->status = VM_EXEC_SUSPENDED;
282	} else {
283	ctx->status = VM_EXEC_NOT_RUNNING;
284	if (flags & STMT_ERROR_OCCURRED)
285	ctx->status = VM_EXEC_ERROR;
286	ctx->reset();
287	}
288
289	m_parserContext->execContext = NULL;
290	m_parserContext = NULL;
291	return ctx->status;
292	}
293
294	} // namespace LinuxSampler