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tclCompile.h@ 6

Last change on this file since 6 was 2, checked in by Pavel Demin, 16 years ago
first commit
File size: 41.8 KB

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1	/*
2	* tclCompile.h --
3	*
4	* Copyright (c) 1996-1997 Sun Microsystems, Inc.
5	*
6	* See the file "license.terms" for information on usage and redistribution
7	* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
8	*
9	* RCS: @(#) $Id: tclCompile.h,v 1.1 2008-06-04 13:58:05 demin Exp $
10	*/
11
12	#ifndef _TCLCOMPILATION
13	#define _TCLCOMPILATION 1
14
15	#ifndef _TCLINT
16	#include "tclInt.h"
17	#endif /* _TCLINT */
18
19	#ifdef BUILD_tcl
20	# undef TCL_STORAGE_CLASS
21	# define TCL_STORAGE_CLASS DLLEXPORT
22	#endif
23
24	/*
25	*------------------------------------------------------------------------
26	* Variables related to compilation. These are used in tclCompile.c,
27	* tclExecute.c, tclBasic.c, and their clients.
28	*------------------------------------------------------------------------
29	*/
30
31	/*
32	* Variable that denotes the command name Tcl object type. Objects of this
33	* type cache the Command pointer that results from looking up command names
34	* in the command hashtable.
35	*/
36
37	extern Tcl_ObjType tclCmdNameType;
38
39	/*
40	* Variable that controls whether compilation tracing is enabled and, if so,
41	* what level of tracing is desired:
42	* 0: no compilation tracing
43	* 1: summarize compilation of top level cmds and proc bodies
44	* 2: display all instructions of each ByteCode compiled
45	* This variable is linked to the Tcl variable "tcl_traceCompile".
46	*/
47
48	extern int tclTraceCompile;
49
50	/*
51	* Variable that controls whether execution tracing is enabled and, if so,
52	* what level of tracing is desired:
53	* 0: no execution tracing
54	* 1: trace invocations of Tcl procs only
55	* 2: trace invocations of all (not compiled away) commands
56	* 3: display each instruction executed
57	* This variable is linked to the Tcl variable "tcl_traceExec".
58	*/
59
60	extern int tclTraceExec;
61
62	/*
63	* The number of bytecode compilations and various other compilation-related
64	* statistics. The tclByteCodeCount and tclSourceCount arrays are used to
65	* hold the count of ByteCodes and sources whose sizes fall into various
66	* binary decades; e.g., tclByteCodeCount[5] is a count of the ByteCodes
67	* with size larger than 24 and less than or equal to 25.
68	*/
69
70	#ifdef TCL_COMPILE_STATS
71	extern long tclNumCompilations;
72	extern double tclTotalSourceBytes;
73	extern double tclTotalCodeBytes;
74
75	extern double tclTotalInstBytes;
76	extern double tclTotalObjBytes;
77	extern double tclTotalExceptBytes;
78	extern double tclTotalAuxBytes;
79	extern double tclTotalCmdMapBytes;
80
81	extern double tclCurrentSourceBytes;
82	extern double tclCurrentCodeBytes;
83
84	extern int tclSourceCount[32];
85	extern int tclByteCodeCount[32];
86	#endif /* TCL_COMPILE_STATS */
87
88	/*
89	*------------------------------------------------------------------------
90	* Data structures related to compilation.
91	*------------------------------------------------------------------------
92	*/
93
94	/*
95	* The structure used to implement Tcl "exceptions" (exceptional returns):
96	* for example, those generated in loops by the break and continue commands,
97	* and those generated by scripts and caught by the catch command. This
98	* ExceptionRange structure describes a range of code (e.g., a loop body),
99	* the kind of exceptions (e.g., a break or continue) that might occur, and
100	* the PC offsets to jump to if a matching exception does occur. Exception
101	* ranges can nest so this structure includes a nesting level that is used
102	* at runtime to find the closest exception range surrounding a PC. For
103	* example, when a break command is executed, the ExceptionRange structure
104	* for the most deeply nested loop, if any, is found and used. These
105	* structures are also generated for the "next" subcommands of for loops
106	* since a break there terminates the for command. This means a for command
107	* actually generates two LoopInfo structures.
108	*/
109
110	typedef enum {
111	LOOP_EXCEPTION_RANGE, /* Code range is part of a loop command.
112	* break and continue "exceptions" cause
113	* jumps to appropriate PC offsets. */
114	CATCH_EXCEPTION_RANGE /* Code range is controlled by a catch
115	* command. Errors in the range cause a
116	* jump to a particular PC offset. */
117	} ExceptionRangeType;
118
119	typedef struct ExceptionRange {
120	ExceptionRangeType type; /* The kind of ExceptionRange. */
121	int nestingLevel; /* Static depth of the exception range.
122	* Used to find the most deeply-nested
123	* range surrounding a PC at runtime. */
124	int codeOffset; /* Offset of the first instruction byte of
125	* the code range. */
126	int numCodeBytes; /* Number of bytes in the code range. */
127	int breakOffset; /* If a LOOP_EXCEPTION_RANGE, the target
128	* PC offset for a break command in the
129	* range. */
130	int continueOffset; /* If a LOOP_EXCEPTION_RANGE and not -1,
131	* the target PC offset for a continue
132	* command in the code range. Otherwise,
133	* ignore this range when processing a
134	* continue command. */
135	int catchOffset; /* If a CATCH_EXCEPTION_RANGE, the target PC
136	* offset for an "exception" in range. */
137	} ExceptionRange;
138
139	/*
140	* Structure used to map between instruction pc and source locations. It
141	* defines for each compiled Tcl command its code's starting offset and
142	* its source's starting offset and length. Note that the code offset
143	* increases monotonically: that is, the table is sorted in code offset
144	* order. The source offset is not monotonic.
145	*/
146
147	typedef struct CmdLocation {
148	int codeOffset; /* Offset of first byte of command code. */
149	int numCodeBytes; /* Number of bytes for command's code. */
150	int srcOffset; /* Offset of first char of the command. */
151	int numSrcChars; /* Number of command source chars. */
152	} CmdLocation;
153
154	/*
155	* CompileProcs need the ability to record information during compilation
156	* that can be used by bytecode instructions during execution. The AuxData
157	* structure provides this "auxiliary data" mechanism. An arbitrary number
158	* of these structures can be stored in the ByteCode record (during
159	* compilation they are stored in a CompileEnv structure). Each AuxData
160	* record holds one word of client-specified data (often a pointer) and is
161	* given an index that instructions can later use to look up the structure
162	* and its data.
163	*
164	* The following definitions declare the types of procedures that are called
165	* to duplicate or free this auxiliary data when the containing ByteCode
166	* objects are duplicated and freed. Pointers to these procedures are kept
167	* in the AuxData structure.
168	*/
169
170	typedef ClientData (AuxDataDupProc) _ANSI_ARGS_((ClientData clientData));
171	typedef void (AuxDataFreeProc) _ANSI_ARGS_((ClientData clientData));
172
173	/*
174	* We define a separate AuxDataType struct to hold type-related information
175	* for the AuxData structure. This separation makes it possible for clients
176	* outside of the TCL core to manipulate (in a limited fashion!) AuxData;
177	* for example, it makes it possible to pickle and unpickle AuxData structs.
178	*/
179
180	typedef struct AuxDataType {
181	char name; / the name of the type. Types can be
182	* registered and found by name */
183	AuxDataDupProc dupProc; / Callback procedure to invoke when the
184	* aux data is duplicated (e.g., when the
185	* ByteCode structure containing the aux
186	* data is duplicated). NULL means just
187	* copy the source clientData bits; no
188	* proc need be called. */
189	AuxDataFreeProc freeProc; / Callback procedure to invoke when the
190	* aux data is freed. NULL means no
191	* proc need be called. */
192	} AuxDataType;
193
194	/*
195	* The definition of the AuxData structure that holds information created
196	* during compilation by CompileProcs and used by instructions during
197	* execution.
198	*/
199
200	typedef struct AuxData {
201	AuxDataType type; / pointer to the AuxData type associated with
202	* this ClientData. */
203	ClientData clientData; /* The compilation data itself. */
204	} AuxData;
205
206	/*
207	* Structure defining the compilation environment. After compilation, fields
208	* describing bytecode instructions are copied out into the more compact
209	* ByteCode structure defined below.
210	*/
211
212	#define COMPILEENV_INIT_CODE_BYTES 250
213	#define COMPILEENV_INIT_NUM_OBJECTS 40
214	#define COMPILEENV_INIT_EXCEPT_RANGES 5
215	#define COMPILEENV_INIT_CMD_MAP_SIZE 40
216	#define COMPILEENV_INIT_AUX_DATA_SIZE 5
217
218	typedef struct CompileEnv {
219	Interp iPtr; / Interpreter containing the code being
220	* compiled. Commands and their compile
221	* procs are specific to an interpreter so
222	* the code emitted will depend on the
223	* interpreter. */
224	char source; / The source string being compiled by
225	* SetByteCodeFromAny. This pointer is not
226	* owned by the CompileEnv and must not be
227	* freed or changed by it. */
228	Proc procPtr; / If a procedure is being compiled, a
229	* pointer to its Proc structure; otherwise
230	* NULL. Used to compile local variables.
231	* Set from information provided by
232	* ObjInterpProc in tclProc.c. */
233	int numCommands; /* Number of commands compiled. */
234	int excRangeDepth; /* Current exception range nesting level;
235	* -1 if not in any range currently. */
236	int maxExcRangeDepth; /* Max nesting level of exception ranges;
237	* -1 if no ranges have been compiled. */
238	int maxStackDepth; /* Maximum number of stack elements needed
239	* to execute the code. Set by compilation
240	* procedures before returning. */
241	Tcl_HashTable objTable; /* Contains all Tcl objects referenced by
242	* the compiled code. Indexed by the string
243	* representations of the objects. Used to
244	* avoid creating duplicate objects. */
245	int pushSimpleWords; /* Set 1 by callers of compilation routines
246	* if they should emit instructions to push
247	* "simple" command words (those that are
248	* just a sequence of characters). If 0, the
249	* callers are responsible for compiling
250	* simple words. */
251	int wordIsSimple; /* Set 1 by compilation procedures before
252	* returning if the previous command word
253	* was just a sequence of characters,
254	* otherwise 0. Used to help determine the
255	* command being compiled. */
256	int numSimpleWordChars; /* If wordIsSimple is 1 then the number of
257	* characters in the simple word, else 0. */
258	int exprIsJustVarRef; /* Set 1 if the expression last compiled by
259	* TclCompileExpr consisted of just a
260	* variable reference as in the expression
261	* of "if $b then...". Otherwise 0. Used
262	* to implement expr's 2 level substitution
263	* semantics properly. */
264	int exprIsComparison; /* Set 1 if the top-level operator in the
265	* expression last compiled is a comparison.
266	* Otherwise 0. If 1, since the operands
267	* might be strings, the expr is compiled
268	* out-of-line to implement expr's 2 level
269	* substitution semantics properly. */
270	int termOffset; /* Offset of character just after the last
271	* one compiled. Set by compilation
272	* procedures before returning. */
273	unsigned char codeStart; / Points to the first byte of the code. */
274	unsigned char codeNext; / Points to next code array byte to use. */
275	unsigned char codeEnd; / Points just after the last allocated
276	* code array byte. */
277	int mallocedCodeArray; /* Set 1 if code array was expanded
278	* and codeStart points into the heap.*/
279	Tcl_Obj *objArrayPtr; / Points to start of object array. */
280	int objArrayNext; /* Index of next free object array entry. */
281	int objArrayEnd; /* Index just after last obj array entry. */
282	int mallocedObjArray; /* 1 if object array was expanded and
283	* objArray points into the heap, else 0. */
284	ExceptionRange *excRangeArrayPtr;
285	/* Points to start of the ExceptionRange
286	* array. */
287	int excRangeArrayNext; /* Next free ExceptionRange array index.
288	* excRangeArrayNext is the number of ranges
289	* and (excRangeArrayNext-1) is the index of
290	* the current range's array entry. */
291	int excRangeArrayEnd; /* Index after the last ExceptionRange
292	* array entry. */
293	int mallocedExcRangeArray; /* 1 if ExceptionRange array was expanded
294	* and excRangeArrayPtr points in heap,
295	* else 0. */
296	CmdLocation cmdMapPtr; / Points to start of CmdLocation array.
297	* numCommands is the index of the next
298	* entry to use; (numCommands-1) is the
299	* entry index for the last command. */
300	int cmdMapEnd; /* Index after last CmdLocation entry. */
301	int mallocedCmdMap; /* 1 if command map array was expanded and
302	* cmdMapPtr points in the heap, else 0. */
303	AuxData auxDataArrayPtr; / Points to auxiliary data array start. */
304	int auxDataArrayNext; /* Next free compile aux data array index.
305	* auxDataArrayNext is the number of aux
306	* data items and (auxDataArrayNext-1) is
307	* index of current aux data array entry. */
308	int auxDataArrayEnd; /* Index after last aux data array entry. */
309	int mallocedAuxDataArray; /* 1 if aux data array was expanded and
310	* auxDataArrayPtr points in heap else 0. */
311	unsigned char staticCodeSpace[COMPILEENV_INIT_CODE_BYTES];
312	/* Initial storage for code. */
313	Tcl_Obj *staticObjArraySpace[COMPILEENV_INIT_NUM_OBJECTS];
314	/* Initial storage for object array. */
315	ExceptionRange staticExcRangeArraySpace[COMPILEENV_INIT_EXCEPT_RANGES];
316	/* Initial ExceptionRange array storage. */
317	CmdLocation staticCmdMapSpace[COMPILEENV_INIT_CMD_MAP_SIZE];
318	/* Initial storage for cmd location map. */
319	AuxData staticAuxDataArraySpace[COMPILEENV_INIT_AUX_DATA_SIZE];
320	/* Initial storage for aux data array. */
321	} CompileEnv;
322
323	/*
324	* The structure defining the bytecode instructions resulting from compiling
325	* a Tcl script. Note that this structure is variable length: a single heap
326	* object is allocated to hold the ByteCode structure immediately followed
327	* by the code bytes, the object array, the ExceptionRange array, the
328	* CmdLocation map, and the compilation AuxData array.
329	*/
330
331	/*
332	* A PRECOMPILED bytecode struct is one that was generated from a compiled
333	* image rather than implicitly compiled from source
334	*/
335	#define TCL_BYTECODE_PRECOMPILED 0x0001
336
337	typedef struct ByteCode {
338	Interp iPtr; / Interpreter containing the code being
339	* compiled. Commands and their compile
340	* procs are specific to an interpreter so
341	* the code emitted will depend on the
342	* interpreter. */
343	int compileEpoch; /* Value of iPtr->compileEpoch when this
344	* ByteCode was compiled. Used to invalidate
345	* code when, e.g., commands with compile
346	* procs are redefined. */
347	Namespace nsPtr; / Namespace context in which this code
348	* was compiled. If the code is executed
349	* if a different namespace, it must be
350	* recompiled. */
351	int nsEpoch; /* Value of nsPtr->resolverEpoch when this
352	* ByteCode was compiled. Used to invalidate
353	* code when new namespace resolution rules
354	* are put into effect. */
355	int refCount; /* Reference count: set 1 when created
356	* plus 1 for each execution of the code
357	* currently active. This structure can be
358	* freed when refCount becomes zero. */
359	unsigned int flags; /* flags describing state for the codebyte.
360	* this variable holds ORed values from the
361	* TCL_BYTECODE_ masks defined above */
362	char source; / The source string from which this
363	* ByteCode was compiled. Note that this
364	* pointer is not owned by the ByteCode and
365	* must not be freed or modified by it. */
366	Proc procPtr; / If the ByteCode was compiled from a
367	* procedure body, this is a pointer to its
368	* Proc structure; otherwise NULL. This
369	* pointer is also not owned by the ByteCode
370	* and must not be freed by it. Used for
371	* debugging. */
372	size_t totalSize; /* Total number of bytes required for this
373	* ByteCode structure including the storage
374	* for Tcl objects in its object array. */
375	int numCommands; /* Number of commands compiled. */
376	int numSrcChars; /* Number of source chars compiled. */
377	int numCodeBytes; /* Number of code bytes. */
378	int numObjects; /* Number of Tcl objects in object array. */
379	int numExcRanges; /* Number of ExceptionRange array elems. */
380	int numAuxDataItems; /* Number of AuxData items. */
381	int numCmdLocBytes; /* Number of bytes needed for encoded
382	* command location information. */
383	int maxExcRangeDepth; /* Maximum nesting level of ExceptionRanges;
384	* -1 if no ranges were compiled. */
385	int maxStackDepth; /* Maximum number of stack elements needed
386	* to execute the code. */
387	unsigned char codeStart; / Points to the first byte of the code.
388	* This is just after the final ByteCode
389	* member cmdMapPtr. */
390	Tcl_Obj *objArrayPtr; / Points to the start of the object array.
391	* This is just after the last code byte. */
392	ExceptionRange *excRangeArrayPtr;
393	/* Points to the start of the ExceptionRange
394	* array. This is just after the last
395	* object in the object array. */
396	AuxData auxDataArrayPtr; / Points to the start of the auxiliary data
397	* array. This is just after the last entry
398	* in the ExceptionRange array. */
399	unsigned char *codeDeltaStart;
400	/* Points to the first of a sequence of
401	* bytes that encode the change in the
402	* starting offset of each command's code.
403	* If -127<=delta<=127, it is encoded as 1
404	* byte, otherwise 0xFF (128) appears and
405	* the delta is encoded by the next 4 bytes.
406	* Code deltas are always positive. This
407	* sequence is just after the last entry in
408	* the AuxData array. */
409	unsigned char *codeLengthStart;
410	/* Points to the first of a sequence of
411	* bytes that encode the length of each
412	* command's code. The encoding is the same
413	* as for code deltas. Code lengths are
414	* always positive. This sequence is just
415	* after the last entry in the code delta
416	* sequence. */
417	unsigned char *srcDeltaStart;
418	/* Points to the first of a sequence of
419	* bytes that encode the change in the
420	* starting offset of each command's source.
421	* The encoding is the same as for code
422	* deltas. Source deltas can be negative.
423	* This sequence is just after the last byte
424	* in the code length sequence. */
425	unsigned char *srcLengthStart;
426	/* Points to the first of a sequence of
427	* bytes that encode the length of each
428	* command's source. The encoding is the
429	* same as for code deltas. Source lengths
430	* are always positive. This sequence is
431	* just after the last byte in the source
432	* delta sequence. */
433	} ByteCode;
434
435	/*
436	* Opcodes for the Tcl bytecode instructions. These opcodes must correspond
437	* to the entries in the table of instruction descriptions in tclCompile.c.
438	* Also, the order and number of the expression opcodes (e.g., INST_LOR)
439	* must match the entries in the array operatorStrings in tclExecute.c.
440	*/
441
442	/* Opcodes 0 to 9 */
443	#define INST_DONE 0
444	#define INST_PUSH1 (INST_DONE + 1)
445	#define INST_PUSH4 (INST_DONE + 2)
446	#define INST_POP (INST_DONE + 3)
447	#define INST_DUP (INST_DONE + 4)
448	#define INST_CONCAT1 (INST_DONE + 5)
449	#define INST_INVOKE_STK1 (INST_DONE + 6)
450	#define INST_INVOKE_STK4 (INST_DONE + 7)
451	#define INST_EVAL_STK (INST_DONE + 8)
452	#define INST_EXPR_STK (INST_DONE + 9)
453
454	/* Opcodes 10 to 23 */
455	#define INST_LOAD_SCALAR1 (INST_EXPR_STK + 1)
456	#define INST_LOAD_SCALAR4 (INST_LOAD_SCALAR1 + 1)
457	#define INST_LOAD_SCALAR_STK (INST_LOAD_SCALAR1 + 2)
458	#define INST_LOAD_ARRAY1 (INST_LOAD_SCALAR1 + 3)
459	#define INST_LOAD_ARRAY4 (INST_LOAD_SCALAR1 + 4)
460	#define INST_LOAD_ARRAY_STK (INST_LOAD_SCALAR1 + 5)
461	#define INST_LOAD_STK (INST_LOAD_SCALAR1 + 6)
462	#define INST_STORE_SCALAR1 (INST_LOAD_SCALAR1 + 7)
463	#define INST_STORE_SCALAR4 (INST_LOAD_SCALAR1 + 8)
464	#define INST_STORE_SCALAR_STK (INST_LOAD_SCALAR1 + 9)
465	#define INST_STORE_ARRAY1 (INST_LOAD_SCALAR1 + 10)
466	#define INST_STORE_ARRAY4 (INST_LOAD_SCALAR1 + 11)
467	#define INST_STORE_ARRAY_STK (INST_LOAD_SCALAR1 + 12)
468	#define INST_STORE_STK (INST_LOAD_SCALAR1 + 13)
469
470	/* Opcodes 24 to 33 */
471	#define INST_INCR_SCALAR1 (INST_STORE_STK + 1)
472	#define INST_INCR_SCALAR_STK (INST_INCR_SCALAR1 + 1)
473	#define INST_INCR_ARRAY1 (INST_INCR_SCALAR1 + 2)
474	#define INST_INCR_ARRAY_STK (INST_INCR_SCALAR1 + 3)
475	#define INST_INCR_STK (INST_INCR_SCALAR1 + 4)
476	#define INST_INCR_SCALAR1_IMM (INST_INCR_SCALAR1 + 5)
477	#define INST_INCR_SCALAR_STK_IMM (INST_INCR_SCALAR1 + 6)
478	#define INST_INCR_ARRAY1_IMM (INST_INCR_SCALAR1 + 7)
479	#define INST_INCR_ARRAY_STK_IMM (INST_INCR_SCALAR1 + 8)
480	#define INST_INCR_STK_IMM (INST_INCR_SCALAR1 + 9)
481
482	/* Opcodes 34 to 39 */
483	#define INST_JUMP1 (INST_INCR_STK_IMM + 1)
484	#define INST_JUMP4 (INST_JUMP1 + 1)
485	#define INST_JUMP_TRUE1 (INST_JUMP1 + 2)
486	#define INST_JUMP_TRUE4 (INST_JUMP1 + 3)
487	#define INST_JUMP_FALSE1 (INST_JUMP1 + 4)
488	#define INST_JUMP_FALSE4 (INST_JUMP1 + 5)
489
490	/* Opcodes 40 to 64 */
491	#define INST_LOR (INST_JUMP_FALSE4 + 1)
492	#define INST_LAND (INST_LOR + 1)
493	#define INST_BITOR (INST_LOR + 2)
494	#define INST_BITXOR (INST_LOR + 3)
495	#define INST_BITAND (INST_LOR + 4)
496	#define INST_EQ (INST_LOR + 5)
497	#define INST_NEQ (INST_LOR + 6)
498	#define INST_LT (INST_LOR + 7)
499	#define INST_GT (INST_LOR + 8)
500	#define INST_LE (INST_LOR + 9)
501	#define INST_GE (INST_LOR + 10)
502	#define INST_LSHIFT (INST_LOR + 11)
503	#define INST_RSHIFT (INST_LOR + 12)
504	#define INST_ADD (INST_LOR + 13)
505	#define INST_SUB (INST_LOR + 14)
506	#define INST_MULT (INST_LOR + 15)
507	#define INST_DIV (INST_LOR + 16)
508	#define INST_MOD (INST_LOR + 17)
509	#define INST_UPLUS (INST_LOR + 18)
510	#define INST_UMINUS (INST_LOR + 19)
511	#define INST_BITNOT (INST_LOR + 20)
512	#define INST_LNOT (INST_LOR + 21)
513	#define INST_CALL_BUILTIN_FUNC1 (INST_LOR + 22)
514	#define INST_CALL_FUNC1 (INST_LOR + 23)
515	#define INST_TRY_CVT_TO_NUMERIC (INST_LOR + 24)
516
517	/* Opcodes 65 to 66 */
518	#define INST_BREAK (INST_TRY_CVT_TO_NUMERIC + 1)
519	#define INST_CONTINUE (INST_BREAK + 1)
520
521	/* Opcodes 67 to 68 */
522	#define INST_FOREACH_START4 (INST_CONTINUE + 1)
523	#define INST_FOREACH_STEP4 (INST_FOREACH_START4 + 1)
524
525	/* Opcodes 69 to 72 */
526	#define INST_BEGIN_CATCH4 (INST_FOREACH_STEP4 + 1)
527	#define INST_END_CATCH (INST_BEGIN_CATCH4 + 1)
528	#define INST_PUSH_RESULT (INST_BEGIN_CATCH4 + 2)
529	#define INST_PUSH_RETURN_CODE (INST_BEGIN_CATCH4 + 3)
530
531	/* The last opcode */
532	#define LAST_INST_OPCODE INST_PUSH_RETURN_CODE
533
534	/*
535	* Table describing the Tcl bytecode instructions: their name (for
536	* displaying code), total number of code bytes required (including
537	* operand bytes), and a description of the type of each operand.
538	* These operand types include signed and unsigned integers of length
539	* one and four bytes. The unsigned integers are used for indexes or
540	* for, e.g., the count of objects to push in a "push" instruction.
541	*/
542
543	#define MAX_INSTRUCTION_OPERANDS 2
544
545	typedef enum InstOperandType {
546	OPERAND_NONE,
547	OPERAND_INT1, /* One byte signed integer. */
548	OPERAND_INT4, /* Four byte signed integer. */
549	OPERAND_UINT1, /* One byte unsigned integer. */
550	OPERAND_UINT4 /* Four byte unsigned integer. */
551	} InstOperandType;
552
553	typedef struct InstructionDesc {
554	char name; / Name of instruction. */
555	int numBytes; /* Total number of bytes for instruction. */
556	int numOperands; /* Number of operands. */
557	InstOperandType opTypes[MAX_INSTRUCTION_OPERANDS];
558	/* The type of each operand. */
559	} InstructionDesc;
560
561	extern InstructionDesc instructionTable[];
562
563	/*
564	* Definitions of the values of the INST_CALL_BUILTIN_FUNC instruction's
565	* operand byte. Each value denotes a builtin Tcl math function. These
566	* values must correspond to the entries in the builtinFuncTable array
567	* below and to the values stored in the tclInt.h MathFunc structure's
568	* builtinFuncIndex field.
569	*/
570
571	#define BUILTIN_FUNC_ACOS 0
572	#define BUILTIN_FUNC_ASIN 1
573	#define BUILTIN_FUNC_ATAN 2
574	#define BUILTIN_FUNC_ATAN2 3
575	#define BUILTIN_FUNC_CEIL 4
576	#define BUILTIN_FUNC_COS 5
577	#define BUILTIN_FUNC_COSH 6
578	#define BUILTIN_FUNC_EXP 7
579	#define BUILTIN_FUNC_FLOOR 8
580	#define BUILTIN_FUNC_FMOD 9
581	#define BUILTIN_FUNC_HYPOT 10
582	#define BUILTIN_FUNC_LOG 11
583	#define BUILTIN_FUNC_LOG10 12
584	#define BUILTIN_FUNC_POW 13
585	#define BUILTIN_FUNC_SIN 14
586	#define BUILTIN_FUNC_SINH 15
587	#define BUILTIN_FUNC_SQRT 16
588	#define BUILTIN_FUNC_TAN 17
589	#define BUILTIN_FUNC_TANH 18
590	#define BUILTIN_FUNC_ABS 19
591	#define BUILTIN_FUNC_DOUBLE 20
592	#define BUILTIN_FUNC_INT 21
593	#define BUILTIN_FUNC_RAND 22
594	#define BUILTIN_FUNC_ROUND 23
595	#define BUILTIN_FUNC_SRAND 24
596
597	#define LAST_BUILTIN_FUNC BUILTIN_FUNC_SRAND
598
599	/*
600	* Table describing the built-in math functions. Entries in this table are
601	* indexed by the values of the INST_CALL_BUILTIN_FUNC instruction's
602	* operand byte.
603	*/
604
605	typedef int (CallBuiltinFuncProc) _ANSI_ARGS_((Tcl_Interp *interp,
606	ExecEnv *eePtr, ClientData clientData));
607
608	typedef struct {
609	char name; / Name of function. */
610	int numArgs; /* Number of arguments for function. */
611	Tcl_ValueType argTypes[MAX_MATH_ARGS];
612	/* Acceptable types for each argument. */
613	CallBuiltinFuncProc proc; / Procedure implementing this function. */
614	ClientData clientData; /* Additional argument to pass to the
615	* function when invoking it. */
616	} BuiltinFunc;
617
618	extern BuiltinFunc builtinFuncTable[];
619
620	/*
621	* The structure used to hold information about the start and end of each
622	* argument word in a command.
623	*/
624
625	#define ARGINFO_INIT_ENTRIES 5
626
627	typedef struct ArgInfo {
628	int numArgs; /* Number of argument words in command. */
629	char *startArray; / Array of pointers to the first character
630	* of each argument word. */
631	char *endArray; / Array of pointers to the last character
632	* of each argument word. */
633	int allocArgs; /* Number of array entries currently
634	* allocated. */
635	int mallocedArrays; /* 1 if the arrays were expanded and
636	* wordStartArray/wordEndArray point into
637	* the heap, else 0. */
638	char *staticStartSpace[ARGINFO_INIT_ENTRIES];
639	/* Initial storage for word start array. */
640	char *staticEndSpace[ARGINFO_INIT_ENTRIES];
641	/* Initial storage for word end array. */
642	} ArgInfo;
643
644	/*
645	* Compilation of some Tcl constructs such as if commands and the logical or
646	* (\|\|) and logical and (&&) operators in expressions requires the
647	* generation of forward jumps. Since the PC target of these jumps isn't
648	* known when the jumps are emitted, we record the offset of each jump in an
649	* array of JumpFixup structures. There is one array for each sequence of
650	* jumps to one target PC. When we learn the target PC, we update the jumps
651	* with the correct distance. Also, if the distance is too great (> 127
652	* bytes), we replace the single-byte jump with a four byte jump
653	* instruction, move the instructions after the jump down, and update the
654	* code offsets for any commands between the jump and the target.
655	*/
656
657	typedef enum {
658	TCL_UNCONDITIONAL_JUMP,
659	TCL_TRUE_JUMP,
660	TCL_FALSE_JUMP
661	} TclJumpType;
662
663	typedef struct JumpFixup {
664	TclJumpType jumpType; /* Indicates the kind of jump. */
665	int codeOffset; /* Offset of the first byte of the one-byte
666	* forward jump's code. */
667	int cmdIndex; /* Index of the first command after the one
668	* for which the jump was emitted. Used to
669	* update the code offsets for subsequent
670	* commands if the two-byte jump at jumpPc
671	* must be replaced with a five-byte one. */
672	int excRangeIndex; /* Index of the first range entry in the
673	* ExceptionRange array after the current
674	* one. This field is used to adjust the
675	* code offsets in subsequent ExceptionRange
676	* records when a jump is grown from 2 bytes
677	* to 5 bytes. */
678	} JumpFixup;
679
680	#define JUMPFIXUP_INIT_ENTRIES 10
681
682	typedef struct JumpFixupArray {
683	JumpFixup fixup; / Points to start of jump fixup array. */
684	int next; /* Index of next free array entry. */
685	int end; /* Index of last usable entry in array. */
686	int mallocedArray; /* 1 if array was expanded and fixups points
687	* into the heap, else 0. */
688	JumpFixup staticFixupSpace[JUMPFIXUP_INIT_ENTRIES];
689	/* Initial storage for jump fixup array. */
690	} JumpFixupArray;
691
692	/*
693	* The structure describing one variable list of a foreach command. Note
694	* that only foreach commands inside procedure bodies are compiled inline so
695	* a ForeachVarList structure always describes local variables. Furthermore,
696	* only scalar variables are supported for inline-compiled foreach loops.
697	*/
698
699	typedef struct ForeachVarList {
700	int numVars; /* The number of variables in the list. */
701	int varIndexes[1]; /* An array of the indexes ("slot numbers")
702	* for each variable in the procedure's
703	* array of local variables. Only scalar
704	* variables are supported. The actual
705	* size of this field will be large enough
706	* to numVars indexes. THIS MUST BE THE
707	* LAST FIELD IN THE STRUCTURE! */
708	} ForeachVarList;
709
710	/*
711	* Structure used to hold information about a foreach command that is needed
712	* during program execution. These structures are stored in CompileEnv and
713	* ByteCode structures as auxiliary data.
714	*/
715
716	typedef struct ForeachInfo {
717	int numLists; /* The number of both the variable and value
718	* lists of the foreach command. */
719	int firstListTmp; /* The slot number of the first temporary
720	* variable holding the lists themselves. */
721	int loopIterNumTmp; /* The slot number of the temp var holding
722	* the count of times the loop body has been
723	* executed. This is used to determine which
724	* list element to assign each loop var. */
725	ForeachVarList varLists[1];/ An array of pointers to ForeachVarList
726	* structures describing each var list. The
727	* actual size of this field will be large
728	* enough to numVars indexes. THIS MUST BE
729	* THE LAST FIELD IN THE STRUCTURE! */
730	} ForeachInfo;
731
732	/*
733	* Structure containing a cached pointer to a command that is the result
734	* of resolving the command's name in some namespace. It is the internal
735	* representation for a cmdName object. It contains the pointer along
736	* with some information that is used to check the pointer's validity.
737	*/
738
739	typedef struct ResolvedCmdName {
740	Command cmdPtr; / A cached Command pointer. */
741	Namespace refNsPtr; / Points to the namespace containing the
742	* reference (not the namespace that
743	* contains the referenced command). */
744	long refNsId; /* refNsPtr's unique namespace id. Used to
745	* verify that refNsPtr is still valid
746	* (e.g., it's possible that the cmd's
747	* containing namespace was deleted and a
748	* new one created at the same address). */
749	int refNsCmdEpoch; /* Value of the referencing namespace's
750	* cmdRefEpoch when the pointer was cached.
751	* Before using the cached pointer, we check
752	* if the namespace's epoch was incremented;
753	* if so, this cached pointer is invalid. */
754	int cmdEpoch; /* Value of the command's cmdEpoch when this
755	* pointer was cached. Before using the
756	* cached pointer, we check if the cmd's
757	* epoch was incremented; if so, the cmd was
758	* renamed, deleted, hidden, or exposed, and
759	* so the pointer is invalid. */
760	int refCount; /* Reference count: 1 for each cmdName
761	* object that has a pointer to this
762	* ResolvedCmdName structure as its internal
763	* rep. This structure can be freed when
764	* refCount becomes zero. */
765	} ResolvedCmdName;
766
767	/*
768	*----------------------------------------------------------------
769	* Procedures shared among Tcl bytecode compilation and execution
770	* modules but not used outside:
771	*----------------------------------------------------------------
772	*/
773
774	EXTERN void TclCleanupByteCode _ANSI_ARGS_((ByteCode *codePtr));
775	EXTERN int TclCompileExpr _ANSI_ARGS_((Tcl_Interp *interp,
776	char string, char lastChar, int flags,
777	CompileEnv *envPtr));
778	EXTERN int TclCompileQuotes _ANSI_ARGS_((Tcl_Interp *interp,
779	char string, char lastChar, int termChar,
780	int flags, CompileEnv *envPtr));
781	EXTERN int TclCompileString _ANSI_ARGS_((Tcl_Interp *interp,
782	char string, char lastChar, int flags,
783	CompileEnv *envPtr));
784	EXTERN int TclCompileDollarVar _ANSI_ARGS_((Tcl_Interp *interp,
785	char string, char lastChar, int flags,
786	CompileEnv *envPtr));
787	EXTERN int TclCreateAuxData _ANSI_ARGS_((ClientData clientData,
788	AuxDataType typePtr, CompileEnv envPtr));
789	EXTERN ExecEnv * TclCreateExecEnv _ANSI_ARGS_((Tcl_Interp *interp));
790	EXTERN void TclDeleteExecEnv _ANSI_ARGS_((ExecEnv *eePtr));
791	EXTERN void TclEmitForwardJump _ANSI_ARGS_((CompileEnv *envPtr,
792	TclJumpType jumpType, JumpFixup *jumpFixupPtr));
793	EXTERN AuxDataType TclGetAuxDataType _ANSI_ARGS_((char typeName));
794	EXTERN ExceptionRange * TclGetExceptionRangeForPc _ANSI_ARGS_((
795	unsigned char *pc, int catchOnly,
796	ByteCode* codePtr));
797	EXTERN InstructionDesc * TclGetInstructionTable _ANSI_ARGS_(());
798	EXTERN int TclExecuteByteCode _ANSI_ARGS_((Tcl_Interp *interp,
799	ByteCode *codePtr));
800	EXTERN void TclExpandCodeArray _ANSI_ARGS_((
801	CompileEnv *envPtr));
802	EXTERN void TclExpandJumpFixupArray _ANSI_ARGS_((
803	JumpFixupArray *fixupArrayPtr));
804	EXTERN void TclFinalizeAuxDataTypeTable _ANSI_ARGS_((void));
805	EXTERN int TclFixupForwardJump _ANSI_ARGS_((
806	CompileEnv envPtr, JumpFixup jumpFixupPtr,
807	int jumpDist, int distThreshold));
808	EXTERN void TclFreeCompileEnv _ANSI_ARGS_((CompileEnv *envPtr));
809	EXTERN void TclFreeJumpFixupArray _ANSI_ARGS_((
810	JumpFixupArray *fixupArrayPtr));
811	EXTERN void TclInitAuxDataTypeTable _ANSI_ARGS_((void));
812	EXTERN void TclInitByteCodeObj _ANSI_ARGS_((Tcl_Obj *objPtr,
813	CompileEnv *envPtr));
814	EXTERN void TclInitCompileEnv _ANSI_ARGS_((Tcl_Interp *interp,
815	CompileEnv envPtr, char string));
816	EXTERN void TclInitJumpFixupArray _ANSI_ARGS_((
817	JumpFixupArray *fixupArrayPtr));
818	#ifdef TCL_COMPILE_STATS
819	EXTERN int TclLog2 _ANSI_ARGS_((int value));
820	#endif /TCL_COMPILE_STATS/
821	EXTERN int TclObjIndexForString _ANSI_ARGS_((char *start,
822	int length, int allocStrRep, int inHeap,
823	CompileEnv *envPtr));
824	EXTERN int TclPrintInstruction _ANSI_ARGS_((ByteCode* codePtr,
825	unsigned char *pc));
826	EXTERN void TclPrintSource _ANSI_ARGS_((FILE *outFile,
827	char *string, int maxChars));
828	EXTERN void TclRegisterAuxDataType _ANSI_ARGS_((AuxDataType *typePtr));
829
830	/*
831	*----------------------------------------------------------------
832	* Macros used by Tcl bytecode compilation and execution modules
833	* inside the Tcl core but not used outside.
834	*----------------------------------------------------------------
835	*/
836
837	/*
838	* Macros to ensure there is enough room in a CompileEnv's code array.
839	* The ANSI C "prototypes" for these macros are:
840	*
841	* EXTERN void TclEnsureCodeSpace1 _ANSI_ARGS_((CompileEnv *envPtr));
842	* EXTERN void TclEnsureCodeSpace _ANSI_ARGS_((int nBytes,
843	* CompileEnv *envPtr));
844	*/
845
846	#define TclEnsureCodeSpace1(envPtr) \
847	if ((envPtr)->codeNext == (envPtr)->codeEnd) \
848	TclExpandCodeArray(envPtr)
849
850	#define TclEnsureCodeSpace(nBytes, envPtr) \
851	if (((envPtr)->codeNext + nBytes) > (envPtr)->codeEnd) \
852	TclExpandCodeArray(envPtr)
853
854	/*
855	* Macro to emit an opcode byte into a CompileEnv's code array.
856	* The ANSI C "prototype" for this macro is:
857	*
858	* EXTERN void TclEmitOpcode _ANSI_ARGS_((unsigned char op,
859	* CompileEnv *envPtr));
860	*/
861
862	#define TclEmitOpcode(op, envPtr) \
863	TclEnsureCodeSpace1(envPtr); \
864	*(envPtr)->codeNext++ = (unsigned char) (op)
865
866	/*
867	* Macros to emit a (signed or unsigned) int operand. The two variants
868	* depend on the number of bytes needed for the int. Four byte integers
869	* are stored in "big-endian" order with the high order byte stored at
870	* the lowest address. The ANSI C "prototypes" for these macros are:
871	*
872	* EXTERN void TclEmitInt1 _ANSI_ARGS_((int i, CompileEnv *envPtr));
873	* EXTERN void TclEmitInt4 _ANSI_ARGS_((int i, CompileEnv *envPtr));
874	*/
875
876	#define TclEmitInt1(i, envPtr) \
877	TclEnsureCodeSpace(1, (envPtr)); \
878	*(envPtr)->codeNext++ = (unsigned char) ((unsigned int) (i))
879
880	#define TclEmitInt4(i, envPtr) \
881	TclEnsureCodeSpace(4, (envPtr)); \
882	*(envPtr)->codeNext++ = \
883	(unsigned char) ((unsigned int) (i) >> 24); \
884	*(envPtr)->codeNext++ = \
885	(unsigned char) ((unsigned int) (i) >> 16); \
886	*(envPtr)->codeNext++ = \
887	(unsigned char) ((unsigned int) (i) >> 8); \
888	*(envPtr)->codeNext++ = \
889	(unsigned char) ((unsigned int) (i) )
890
891	/*
892	* Macros to emit an instruction with signed or unsigned int operands.
893	* The ANSI C "prototypes" for these macros are:
894	*
895	* EXTERN void TclEmitInstInt1 _ANSI_ARGS_((unsigned char op, int i,
896	* CompileEnv *envPtr));
897	* EXTERN void TclEmitInstInt4 _ANSI_ARGS_((unsigned char op, int i,
898	* CompileEnv *envPtr));
899	* EXTERN void TclEmitInstUInt1 _ANSI_ARGS_((unsigned char op,
900	* unsigned int i, CompileEnv *envPtr));
901	* EXTERN void TclEmitInstUInt4 _ANSI_ARGS_((unsigned char op,
902	* unsigned int i, CompileEnv *envPtr));
903	*/
904
905	#define TclEmitInstInt1(op, i, envPtr) \
906	TclEnsureCodeSpace(2, (envPtr)); \
907	*(envPtr)->codeNext++ = (unsigned char) (op); \
908	*(envPtr)->codeNext++ = (unsigned char) ((unsigned int) (i))
909
910	#define TclEmitInstInt4(op, i, envPtr) \
911	TclEnsureCodeSpace(5, (envPtr)); \
912	*(envPtr)->codeNext++ = (unsigned char) (op); \
913	*(envPtr)->codeNext++ = \
914	(unsigned char) ((unsigned int) (i) >> 24); \
915	*(envPtr)->codeNext++ = \
916	(unsigned char) ((unsigned int) (i) >> 16); \
917	*(envPtr)->codeNext++ = \
918	(unsigned char) ((unsigned int) (i) >> 8); \
919	*(envPtr)->codeNext++ = \
920	(unsigned char) ((unsigned int) (i) )
921
922	#define TclEmitInstUInt1(op, i, envPtr) \
923	TclEmitInstInt1((op), (i), (envPtr))
924
925	#define TclEmitInstUInt4(op, i, envPtr) \
926	TclEmitInstInt4((op), (i), (envPtr))
927
928	/*
929	* Macro to push a Tcl object onto the Tcl evaluation stack. It emits the
930	* object's one or four byte array index into the CompileEnv's code
931	* array. These support, respectively, a maximum of 256 (28) and 232
932	* objects in a CompileEnv. The ANSI C "prototype" for this macro is:
933	*
934	* EXTERN void TclEmitPush _ANSI_ARGS_((int objIndex, CompileEnv *envPtr));
935	*/
936
937	#define TclEmitPush(objIndex, envPtr) \
938	if ((objIndex) <= 255) { \
939	TclEmitInstUInt1(INST_PUSH1, (objIndex), (envPtr)); \
940	} else { \
941	TclEmitInstUInt4(INST_PUSH4, (objIndex), (envPtr)); \
942	}
943
944	/*
945	* Macros to update a (signed or unsigned) integer starting at a pointer.
946	* The two variants depend on the number of bytes. The ANSI C "prototypes"
947	* for these macros are:
948	*
949	* EXTERN void TclStoreInt1AtPtr _ANSI_ARGS_((int i, unsigned char *p));
950	* EXTERN void TclStoreInt4AtPtr _ANSI_ARGS_((int i, unsigned char *p));
951	*/
952
953	#define TclStoreInt1AtPtr(i, p) \
954	*(p) = (unsigned char) ((unsigned int) (i))
955
956	#define TclStoreInt4AtPtr(i, p) \
957	*(p) = (unsigned char) ((unsigned int) (i) >> 24); \
958	*(p+1) = (unsigned char) ((unsigned int) (i) >> 16); \
959	*(p+2) = (unsigned char) ((unsigned int) (i) >> 8); \
960	*(p+3) = (unsigned char) ((unsigned int) (i) )
961
962	/*
963	* Macros to update instructions at a particular pc with a new op code
964	* and a (signed or unsigned) int operand. The ANSI C "prototypes" for
965	* these macros are:
966	*
967	* EXTERN void TclUpdateInstInt1AtPc _ANSI_ARGS_((unsigned char op, int i,
968	* unsigned char *pc));
969	* EXTERN void TclUpdateInstInt4AtPc _ANSI_ARGS_((unsigned char op, int i,
970	* unsigned char *pc));
971	*/
972
973	#define TclUpdateInstInt1AtPc(op, i, pc) \
974	*(pc) = (unsigned char) (op); \
975	TclStoreInt1AtPtr((i), ((pc)+1))
976
977	#define TclUpdateInstInt4AtPc(op, i, pc) \
978	*(pc) = (unsigned char) (op); \
979	TclStoreInt4AtPtr((i), ((pc)+1))
980
981	/*
982	* Macros to get a signed integer (GET_INT{1,2}) or an unsigned int
983	* (GET_UINT{1,2}) from a pointer. There are two variants for each
984	* return type that depend on the number of bytes fetched.
985	* The ANSI C "prototypes" for these macros are:
986	*
987	* EXTERN int TclGetInt1AtPtr _ANSI_ARGS_((unsigned char *p));
988	* EXTERN int TclGetInt4AtPtr _ANSI_ARGS_((unsigned char *p));
989	* EXTERN unsigned int TclGetUInt1AtPtr _ANSI_ARGS_((unsigned char *p));
990	* EXTERN unsigned int TclGetUInt4AtPtr _ANSI_ARGS_((unsigned char *p));
991	*/
992
993	/*
994	* The TclGetInt1AtPtr macro is tricky because we want to do sign
995	* extension on the 1-byte value. Unfortunately the "char" type isn't
996	* signed on all platforms so sign-extension doesn't always happen
997	* automatically. Sometimes we can explicitly declare the pointer to be
998	* signed, but other times we have to explicitly sign-extend the value
999	* in software.
1000	*/
1001
1002	#ifndef __CHAR_UNSIGNED__
1003	# define TclGetInt1AtPtr(p) ((int) ((char ) p))
1004	#else
1005	# ifdef HAVE_SIGNED_CHAR
1006	# define TclGetInt1AtPtr(p) ((int) ((signed char ) p))
1007	# else
1008	# define TclGetInt1AtPtr(p) (((int) ((char ) p)) \
1009	\| ((*(p) & 0200) ? (-256) : 0))
1010	# endif
1011	#endif
1012
1013	#define TclGetInt4AtPtr(p) (((int) TclGetInt1AtPtr(p) << 24) \| \
1014	(*((p)+1) << 16) \| \
1015	(*((p)+2) << 8) \| \
1016	(*((p)+3)))
1017
1018	#define TclGetUInt1AtPtr(p) ((unsigned int) *(p))
1019	#define TclGetUInt4AtPtr(p) ((unsigned int) (*(p) << 24) \| \
1020	(*((p)+1) << 16) \| \
1021	(*((p)+2) << 8) \| \
1022	(*((p)+3)))
1023
1024	/*
1025	* Macros used to compute the minimum and maximum of two integers.
1026	* The ANSI C "prototypes" for these macros are:
1027	*
1028	* EXTERN int TclMin _ANSI_ARGS_((int i, int j));
1029	* EXTERN int TclMax _ANSI_ARGS_((int i, int j));
1030	*/
1031
1032	#define TclMin(i, j) ((((int) i) < ((int) j))? (i) : (j))
1033	#define TclMax(i, j) ((((int) i) > ((int) j))? (i) : (j))
1034
1035	/*
1036	* Macro used to compute the offset of the current instruction in the
1037	* bytecode instruction stream. The ANSI C "prototypes" for this macro is:
1038	*
1039	* EXTERN int TclCurrCodeOffset _ANSI_ARGS_((void));
1040	*/
1041
1042	#define TclCurrCodeOffset() ((envPtr)->codeNext - (envPtr)->codeStart)
1043
1044	/*
1045	* Upper bound for legal jump distances. Checked during compilation if
1046	* debugging.
1047	*/
1048
1049	#define MAX_JUMP_DIST 5000
1050
1051	# undef TCL_STORAGE_CLASS
1052	# define TCL_STORAGE_CLASS DLLIMPORT
1053
1054	#endif /* _TCLCOMPILATION */

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