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source: git/external/tcl/tclCompile.h@ d612dec

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Last change on this file since d612dec was d4f8a8c, checked in by Pavel Demin <pavel-demin@…>, 6 years ago
add TclPrintSource to tclCompile.h
Property mode set to `100644`
File size: 40.0 KB

Rev	Line
[d7d2da3]	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	*------------------------------------------------------------------------
	41	* Data structures related to compilation.
	42	*------------------------------------------------------------------------
	43	*/
	44
	45	/*
	46	* The structure used to implement Tcl "exceptions" (exceptional returns):
	47	* for example, those generated in loops by the break and continue commands,
	48	* and those generated by scripts and caught by the catch command. This
	49	* ExceptionRange structure describes a range of code (e.g., a loop body),
	50	* the kind of exceptions (e.g., a break or continue) that might occur, and
	51	* the PC offsets to jump to if a matching exception does occur. Exception
	52	* ranges can nest so this structure includes a nesting level that is used
	53	* at runtime to find the closest exception range surrounding a PC. For
	54	* example, when a break command is executed, the ExceptionRange structure
	55	* for the most deeply nested loop, if any, is found and used. These
	56	* structures are also generated for the "next" subcommands of for loops
	57	* since a break there terminates the for command. This means a for command
	58	* actually generates two LoopInfo structures.
	59	*/
	60
	61	typedef enum {
	62	LOOP_EXCEPTION_RANGE, /* Code range is part of a loop command.
	63	* break and continue "exceptions" cause
	64	* jumps to appropriate PC offsets. */
	65	CATCH_EXCEPTION_RANGE /* Code range is controlled by a catch
	66	* command. Errors in the range cause a
	67	* jump to a particular PC offset. */
	68	} ExceptionRangeType;
	69
	70	typedef struct ExceptionRange {
	71	ExceptionRangeType type; /* The kind of ExceptionRange. */
	72	int nestingLevel; /* Static depth of the exception range.
	73	* Used to find the most deeply-nested
	74	* range surrounding a PC at runtime. */
	75	int codeOffset; /* Offset of the first instruction byte of
	76	* the code range. */
	77	int numCodeBytes; /* Number of bytes in the code range. */
	78	int breakOffset; /* If a LOOP_EXCEPTION_RANGE, the target
	79	* PC offset for a break command in the
	80	* range. */
	81	int continueOffset; /* If a LOOP_EXCEPTION_RANGE and not -1,
	82	* the target PC offset for a continue
	83	* command in the code range. Otherwise,
	84	* ignore this range when processing a
	85	* continue command. */
	86	int catchOffset; /* If a CATCH_EXCEPTION_RANGE, the target PC
	87	* offset for an "exception" in range. */
	88	} ExceptionRange;
	89
	90	/*
	91	* Structure used to map between instruction pc and source locations. It
	92	* defines for each compiled Tcl command its code's starting offset and
	93	* its source's starting offset and length. Note that the code offset
	94	* increases monotonically: that is, the table is sorted in code offset
	95	* order. The source offset is not monotonic.
	96	*/
	97
	98	typedef struct CmdLocation {
	99	int codeOffset; /* Offset of first byte of command code. */
	100	int numCodeBytes; /* Number of bytes for command's code. */
	101	int srcOffset; /* Offset of first char of the command. */
	102	int numSrcChars; /* Number of command source chars. */
	103	} CmdLocation;
	104
	105	/*
	106	* CompileProcs need the ability to record information during compilation
	107	* that can be used by bytecode instructions during execution. The AuxData
	108	* structure provides this "auxiliary data" mechanism. An arbitrary number
	109	* of these structures can be stored in the ByteCode record (during
	110	* compilation they are stored in a CompileEnv structure). Each AuxData
	111	* record holds one word of client-specified data (often a pointer) and is
	112	* given an index that instructions can later use to look up the structure
	113	* and its data.
	114	*
	115	* The following definitions declare the types of procedures that are called
	116	* to duplicate or free this auxiliary data when the containing ByteCode
	117	* objects are duplicated and freed. Pointers to these procedures are kept
	118	* in the AuxData structure.
	119	*/
	120
	121	typedef ClientData (AuxDataDupProc) _ANSI_ARGS_((ClientData clientData));
	122	typedef void (AuxDataFreeProc) _ANSI_ARGS_((ClientData clientData));
	123
	124	/*
	125	* We define a separate AuxDataType struct to hold type-related information
	126	* for the AuxData structure. This separation makes it possible for clients
	127	* outside of the TCL core to manipulate (in a limited fashion!) AuxData;
	128	* for example, it makes it possible to pickle and unpickle AuxData structs.
	129	*/
	130
	131	typedef struct AuxDataType {
	132	char name; / the name of the type. Types can be
	133	* registered and found by name */
	134	AuxDataDupProc dupProc; / Callback procedure to invoke when the
	135	* aux data is duplicated (e.g., when the
	136	* ByteCode structure containing the aux
	137	* data is duplicated). NULL means just
	138	* copy the source clientData bits; no
	139	* proc need be called. */
	140	AuxDataFreeProc freeProc; / Callback procedure to invoke when the
	141	* aux data is freed. NULL means no
	142	* proc need be called. */
	143	} AuxDataType;
	144
	145	/*
	146	* The definition of the AuxData structure that holds information created
	147	* during compilation by CompileProcs and used by instructions during
	148	* execution.
	149	*/
	150
	151	typedef struct AuxData {
	152	AuxDataType type; / pointer to the AuxData type associated with
	153	* this ClientData. */
	154	ClientData clientData; /* The compilation data itself. */
	155	} AuxData;
	156
	157	/*
	158	* Structure defining the compilation environment. After compilation, fields
	159	* describing bytecode instructions are copied out into the more compact
	160	* ByteCode structure defined below.
	161	*/
	162
	163	#define COMPILEENV_INIT_CODE_BYTES 250
	164	#define COMPILEENV_INIT_NUM_OBJECTS 40
	165	#define COMPILEENV_INIT_EXCEPT_RANGES 5
	166	#define COMPILEENV_INIT_CMD_MAP_SIZE 40
	167	#define COMPILEENV_INIT_AUX_DATA_SIZE 5
	168
	169	typedef struct CompileEnv {
	170	Interp iPtr; / Interpreter containing the code being
	171	* compiled. Commands and their compile
	172	* procs are specific to an interpreter so
	173	* the code emitted will depend on the
	174	* interpreter. */
	175	char source; / The source string being compiled by
	176	* SetByteCodeFromAny. This pointer is not
	177	* owned by the CompileEnv and must not be
	178	* freed or changed by it. */
	179	Proc procPtr; / If a procedure is being compiled, a
	180	* pointer to its Proc structure; otherwise
	181	* NULL. Used to compile local variables.
	182	* Set from information provided by
	183	* ObjInterpProc in tclProc.c. */
	184	int numCommands; /* Number of commands compiled. */
	185	int excRangeDepth; /* Current exception range nesting level;
	186	* -1 if not in any range currently. */
	187	int maxExcRangeDepth; /* Max nesting level of exception ranges;
	188	* -1 if no ranges have been compiled. */
	189	int maxStackDepth; /* Maximum number of stack elements needed
	190	* to execute the code. Set by compilation
	191	* procedures before returning. */
	192	Tcl_HashTable objTable; /* Contains all Tcl objects referenced by
	193	* the compiled code. Indexed by the string
	194	* representations of the objects. Used to
	195	* avoid creating duplicate objects. */
	196	int pushSimpleWords; /* Set 1 by callers of compilation routines
	197	* if they should emit instructions to push
	198	* "simple" command words (those that are
	199	* just a sequence of characters). If 0, the
	200	* callers are responsible for compiling
	201	* simple words. */
	202	int wordIsSimple; /* Set 1 by compilation procedures before
	203	* returning if the previous command word
	204	* was just a sequence of characters,
	205	* otherwise 0. Used to help determine the
	206	* command being compiled. */
	207	int numSimpleWordChars; /* If wordIsSimple is 1 then the number of
	208	* characters in the simple word, else 0. */
	209	int exprIsJustVarRef; /* Set 1 if the expression last compiled by
	210	* TclCompileExpr consisted of just a
	211	* variable reference as in the expression
	212	* of "if $b then...". Otherwise 0. Used
	213	* to implement expr's 2 level substitution
	214	* semantics properly. */
	215	int exprIsComparison; /* Set 1 if the top-level operator in the
	216	* expression last compiled is a comparison.
	217	* Otherwise 0. If 1, since the operands
	218	* might be strings, the expr is compiled
	219	* out-of-line to implement expr's 2 level
	220	* substitution semantics properly. */
	221	int termOffset; /* Offset of character just after the last
	222	* one compiled. Set by compilation
	223	* procedures before returning. */
	224	unsigned char codeStart; / Points to the first byte of the code. */
	225	unsigned char codeNext; / Points to next code array byte to use. */
	226	unsigned char codeEnd; / Points just after the last allocated
	227	* code array byte. */
	228	int mallocedCodeArray; /* Set 1 if code array was expanded
	229	* and codeStart points into the heap.*/
	230	Tcl_Obj *objArrayPtr; / Points to start of object array. */
	231	int objArrayNext; /* Index of next free object array entry. */
	232	int objArrayEnd; /* Index just after last obj array entry. */
	233	int mallocedObjArray; /* 1 if object array was expanded and
	234	* objArray points into the heap, else 0. */
	235	ExceptionRange *excRangeArrayPtr;
	236	/* Points to start of the ExceptionRange
	237	* array. */
	238	int excRangeArrayNext; /* Next free ExceptionRange array index.
	239	* excRangeArrayNext is the number of ranges
	240	* and (excRangeArrayNext-1) is the index of
	241	* the current range's array entry. */
	242	int excRangeArrayEnd; /* Index after the last ExceptionRange
	243	* array entry. */
	244	int mallocedExcRangeArray; /* 1 if ExceptionRange array was expanded
	245	* and excRangeArrayPtr points in heap,
	246	* else 0. */
	247	CmdLocation cmdMapPtr; / Points to start of CmdLocation array.
	248	* numCommands is the index of the next
	249	* entry to use; (numCommands-1) is the
	250	* entry index for the last command. */
	251	int cmdMapEnd; /* Index after last CmdLocation entry. */
	252	int mallocedCmdMap; /* 1 if command map array was expanded and
	253	* cmdMapPtr points in the heap, else 0. */
	254	AuxData auxDataArrayPtr; / Points to auxiliary data array start. */
	255	int auxDataArrayNext; /* Next free compile aux data array index.
	256	* auxDataArrayNext is the number of aux
	257	* data items and (auxDataArrayNext-1) is
	258	* index of current aux data array entry. */
	259	int auxDataArrayEnd; /* Index after last aux data array entry. */
	260	int mallocedAuxDataArray; /* 1 if aux data array was expanded and
	261	* auxDataArrayPtr points in heap else 0. */
	262	unsigned char staticCodeSpace[COMPILEENV_INIT_CODE_BYTES];
	263	/* Initial storage for code. */
	264	Tcl_Obj *staticObjArraySpace[COMPILEENV_INIT_NUM_OBJECTS];
	265	/* Initial storage for object array. */
	266	ExceptionRange staticExcRangeArraySpace[COMPILEENV_INIT_EXCEPT_RANGES];
	267	/* Initial ExceptionRange array storage. */
	268	CmdLocation staticCmdMapSpace[COMPILEENV_INIT_CMD_MAP_SIZE];
	269	/* Initial storage for cmd location map. */
	270	AuxData staticAuxDataArraySpace[COMPILEENV_INIT_AUX_DATA_SIZE];
	271	/* Initial storage for aux data array. */
	272	} CompileEnv;
	273
	274	/*
	275	* The structure defining the bytecode instructions resulting from compiling
	276	* a Tcl script. Note that this structure is variable length: a single heap
	277	* object is allocated to hold the ByteCode structure immediately followed
	278	* by the code bytes, the object array, the ExceptionRange array, the
	279	* CmdLocation map, and the compilation AuxData array.
	280	*/
	281
	282	/*
	283	* A PRECOMPILED bytecode struct is one that was generated from a compiled
	284	* image rather than implicitly compiled from source
	285	*/
	286	#define TCL_BYTECODE_PRECOMPILED 0x0001
	287
	288	typedef struct ByteCode {
	289	Interp iPtr; / Interpreter containing the code being
	290	* compiled. Commands and their compile
	291	* procs are specific to an interpreter so
	292	* the code emitted will depend on the
	293	* interpreter. */
	294	int compileEpoch; /* Value of iPtr->compileEpoch when this
	295	* ByteCode was compiled. Used to invalidate
	296	* code when, e.g., commands with compile
	297	* procs are redefined. */
	298	Namespace nsPtr; / Namespace context in which this code
	299	* was compiled. If the code is executed
	300	* if a different namespace, it must be
	301	* recompiled. */
	302	int nsEpoch; /* Value of nsPtr->resolverEpoch when this
	303	* ByteCode was compiled. Used to invalidate
	304	* code when new namespace resolution rules
	305	* are put into effect. */
	306	int refCount; /* Reference count: set 1 when created
	307	* plus 1 for each execution of the code
	308	* currently active. This structure can be
	309	* freed when refCount becomes zero. */
	310	unsigned int flags; /* flags describing state for the codebyte.
	311	* this variable holds ORed values from the
	312	* TCL_BYTECODE_ masks defined above */
	313	char source; / The source string from which this
	314	* ByteCode was compiled. Note that this
	315	* pointer is not owned by the ByteCode and
	316	* must not be freed or modified by it. */
	317	Proc procPtr; / If the ByteCode was compiled from a
	318	* procedure body, this is a pointer to its
	319	* Proc structure; otherwise NULL. This
	320	* pointer is also not owned by the ByteCode
	321	* and must not be freed by it. Used for
	322	* debugging. */
	323	size_t totalSize; /* Total number of bytes required for this
	324	* ByteCode structure including the storage
	325	* for Tcl objects in its object array. */
	326	int numCommands; /* Number of commands compiled. */
	327	int numSrcChars; /* Number of source chars compiled. */
	328	int numCodeBytes; /* Number of code bytes. */
	329	int numObjects; /* Number of Tcl objects in object array. */
	330	int numExcRanges; /* Number of ExceptionRange array elems. */
	331	int numAuxDataItems; /* Number of AuxData items. */
	332	int numCmdLocBytes; /* Number of bytes needed for encoded
	333	* command location information. */
	334	int maxExcRangeDepth; /* Maximum nesting level of ExceptionRanges;
	335	* -1 if no ranges were compiled. */
	336	int maxStackDepth; /* Maximum number of stack elements needed
	337	* to execute the code. */
	338	unsigned char codeStart; / Points to the first byte of the code.
	339	* This is just after the final ByteCode
	340	* member cmdMapPtr. */
	341	Tcl_Obj *objArrayPtr; / Points to the start of the object array.
	342	* This is just after the last code byte. */
	343	ExceptionRange *excRangeArrayPtr;
	344	/* Points to the start of the ExceptionRange
	345	* array. This is just after the last
	346	* object in the object array. */
	347	AuxData auxDataArrayPtr; / Points to the start of the auxiliary data
	348	* array. This is just after the last entry
	349	* in the ExceptionRange array. */
	350	unsigned char *codeDeltaStart;
	351	/* Points to the first of a sequence of
	352	* bytes that encode the change in the
	353	* starting offset of each command's code.
	354	* If -127<=delta<=127, it is encoded as 1
	355	* byte, otherwise 0xFF (128) appears and
	356	* the delta is encoded by the next 4 bytes.
	357	* Code deltas are always positive. This
	358	* sequence is just after the last entry in
	359	* the AuxData array. */
	360	unsigned char *codeLengthStart;
	361	/* Points to the first of a sequence of
	362	* bytes that encode the length of each
	363	* command's code. The encoding is the same
	364	* as for code deltas. Code lengths are
	365	* always positive. This sequence is just
	366	* after the last entry in the code delta
	367	* sequence. */
	368	unsigned char *srcDeltaStart;
	369	/* Points to the first of a sequence of
	370	* bytes that encode the change in the
	371	* starting offset of each command's source.
	372	* The encoding is the same as for code
	373	* deltas. Source deltas can be negative.
	374	* This sequence is just after the last byte
	375	* in the code length sequence. */
	376	unsigned char *srcLengthStart;
	377	/* Points to the first of a sequence of
	378	* bytes that encode the length of each
	379	* command's source. The encoding is the
	380	* same as for code deltas. Source lengths
	381	* are always positive. This sequence is
	382	* just after the last byte in the source
	383	* delta sequence. */
	384	} ByteCode;
	385
	386	/*
	387	* Opcodes for the Tcl bytecode instructions. These opcodes must correspond
	388	* to the entries in the table of instruction descriptions in tclCompile.c.
	389	* Also, the order and number of the expression opcodes (e.g., INST_LOR)
	390	* must match the entries in the array operatorStrings in tclExecute.c.
	391	*/
	392
	393	/* Opcodes 0 to 9 */
	394	#define INST_DONE 0
	395	#define INST_PUSH1 (INST_DONE + 1)
	396	#define INST_PUSH4 (INST_DONE + 2)
	397	#define INST_POP (INST_DONE + 3)
	398	#define INST_DUP (INST_DONE + 4)
	399	#define INST_CONCAT1 (INST_DONE + 5)
	400	#define INST_INVOKE_STK1 (INST_DONE + 6)
	401	#define INST_INVOKE_STK4 (INST_DONE + 7)
	402	#define INST_EVAL_STK (INST_DONE + 8)
	403	#define INST_EXPR_STK (INST_DONE + 9)
	404
	405	/* Opcodes 10 to 23 */
	406	#define INST_LOAD_SCALAR1 (INST_EXPR_STK + 1)
	407	#define INST_LOAD_SCALAR4 (INST_LOAD_SCALAR1 + 1)
	408	#define INST_LOAD_SCALAR_STK (INST_LOAD_SCALAR1 + 2)
	409	#define INST_LOAD_ARRAY1 (INST_LOAD_SCALAR1 + 3)
	410	#define INST_LOAD_ARRAY4 (INST_LOAD_SCALAR1 + 4)
	411	#define INST_LOAD_ARRAY_STK (INST_LOAD_SCALAR1 + 5)
	412	#define INST_LOAD_STK (INST_LOAD_SCALAR1 + 6)
	413	#define INST_STORE_SCALAR1 (INST_LOAD_SCALAR1 + 7)
	414	#define INST_STORE_SCALAR4 (INST_LOAD_SCALAR1 + 8)
	415	#define INST_STORE_SCALAR_STK (INST_LOAD_SCALAR1 + 9)
	416	#define INST_STORE_ARRAY1 (INST_LOAD_SCALAR1 + 10)
	417	#define INST_STORE_ARRAY4 (INST_LOAD_SCALAR1 + 11)
	418	#define INST_STORE_ARRAY_STK (INST_LOAD_SCALAR1 + 12)
	419	#define INST_STORE_STK (INST_LOAD_SCALAR1 + 13)
	420
	421	/* Opcodes 24 to 33 */
	422	#define INST_INCR_SCALAR1 (INST_STORE_STK + 1)
	423	#define INST_INCR_SCALAR_STK (INST_INCR_SCALAR1 + 1)
	424	#define INST_INCR_ARRAY1 (INST_INCR_SCALAR1 + 2)
	425	#define INST_INCR_ARRAY_STK (INST_INCR_SCALAR1 + 3)
	426	#define INST_INCR_STK (INST_INCR_SCALAR1 + 4)
	427	#define INST_INCR_SCALAR1_IMM (INST_INCR_SCALAR1 + 5)
	428	#define INST_INCR_SCALAR_STK_IMM (INST_INCR_SCALAR1 + 6)
	429	#define INST_INCR_ARRAY1_IMM (INST_INCR_SCALAR1 + 7)
	430	#define INST_INCR_ARRAY_STK_IMM (INST_INCR_SCALAR1 + 8)
	431	#define INST_INCR_STK_IMM (INST_INCR_SCALAR1 + 9)
	432
	433	/* Opcodes 34 to 39 */
	434	#define INST_JUMP1 (INST_INCR_STK_IMM + 1)
	435	#define INST_JUMP4 (INST_JUMP1 + 1)
	436	#define INST_JUMP_TRUE1 (INST_JUMP1 + 2)
	437	#define INST_JUMP_TRUE4 (INST_JUMP1 + 3)
	438	#define INST_JUMP_FALSE1 (INST_JUMP1 + 4)
	439	#define INST_JUMP_FALSE4 (INST_JUMP1 + 5)
	440
	441	/* Opcodes 40 to 64 */
	442	#define INST_LOR (INST_JUMP_FALSE4 + 1)
	443	#define INST_LAND (INST_LOR + 1)
	444	#define INST_BITOR (INST_LOR + 2)
	445	#define INST_BITXOR (INST_LOR + 3)
	446	#define INST_BITAND (INST_LOR + 4)
	447	#define INST_EQ (INST_LOR + 5)
	448	#define INST_NEQ (INST_LOR + 6)
	449	#define INST_LT (INST_LOR + 7)
	450	#define INST_GT (INST_LOR + 8)
	451	#define INST_LE (INST_LOR + 9)
	452	#define INST_GE (INST_LOR + 10)
	453	#define INST_LSHIFT (INST_LOR + 11)
	454	#define INST_RSHIFT (INST_LOR + 12)
	455	#define INST_ADD (INST_LOR + 13)
	456	#define INST_SUB (INST_LOR + 14)
	457	#define INST_MULT (INST_LOR + 15)
	458	#define INST_DIV (INST_LOR + 16)
	459	#define INST_MOD (INST_LOR + 17)
	460	#define INST_UPLUS (INST_LOR + 18)
	461	#define INST_UMINUS (INST_LOR + 19)
	462	#define INST_BITNOT (INST_LOR + 20)
	463	#define INST_LNOT (INST_LOR + 21)
	464	#define INST_CALL_BUILTIN_FUNC1 (INST_LOR + 22)
	465	#define INST_CALL_FUNC1 (INST_LOR + 23)
	466	#define INST_TRY_CVT_TO_NUMERIC (INST_LOR + 24)
	467
	468	/* Opcodes 65 to 66 */
	469	#define INST_BREAK (INST_TRY_CVT_TO_NUMERIC + 1)
	470	#define INST_CONTINUE (INST_BREAK + 1)
	471
	472	/* Opcodes 67 to 68 */
	473	#define INST_FOREACH_START4 (INST_CONTINUE + 1)
	474	#define INST_FOREACH_STEP4 (INST_FOREACH_START4 + 1)
	475
	476	/* Opcodes 69 to 72 */
	477	#define INST_BEGIN_CATCH4 (INST_FOREACH_STEP4 + 1)
	478	#define INST_END_CATCH (INST_BEGIN_CATCH4 + 1)
	479	#define INST_PUSH_RESULT (INST_BEGIN_CATCH4 + 2)
	480	#define INST_PUSH_RETURN_CODE (INST_BEGIN_CATCH4 + 3)
	481
	482	/* The last opcode */
	483	#define LAST_INST_OPCODE INST_PUSH_RETURN_CODE
	484
	485	/*
	486	* Table describing the Tcl bytecode instructions: their name (for
	487	* displaying code), total number of code bytes required (including
	488	* operand bytes), and a description of the type of each operand.
	489	* These operand types include signed and unsigned integers of length
	490	* one and four bytes. The unsigned integers are used for indexes or
	491	* for, e.g., the count of objects to push in a "push" instruction.
	492	*/
	493
	494	#define MAX_INSTRUCTION_OPERANDS 2
	495
	496	typedef enum InstOperandType {
	497	OPERAND_NONE,
	498	OPERAND_INT1, /* One byte signed integer. */
	499	OPERAND_INT4, /* Four byte signed integer. */
	500	OPERAND_UINT1, /* One byte unsigned integer. */
	501	OPERAND_UINT4 /* Four byte unsigned integer. */
	502	} InstOperandType;
	503
	504	typedef struct InstructionDesc {
	505	char name; / Name of instruction. */
	506	int numBytes; /* Total number of bytes for instruction. */
	507	int numOperands; /* Number of operands. */
	508	InstOperandType opTypes[MAX_INSTRUCTION_OPERANDS];
	509	/* The type of each operand. */
	510	} InstructionDesc;
	511
	512	extern InstructionDesc instructionTable[];
	513
	514	/*
	515	* Definitions of the values of the INST_CALL_BUILTIN_FUNC instruction's
	516	* operand byte. Each value denotes a builtin Tcl math function. These
	517	* values must correspond to the entries in the builtinFuncTable array
	518	* below and to the values stored in the tclInt.h MathFunc structure's
	519	* builtinFuncIndex field.
	520	*/
	521
	522	#define BUILTIN_FUNC_ACOS 0
	523	#define BUILTIN_FUNC_ASIN 1
	524	#define BUILTIN_FUNC_ATAN 2
	525	#define BUILTIN_FUNC_ATAN2 3
	526	#define BUILTIN_FUNC_CEIL 4
	527	#define BUILTIN_FUNC_COS 5
	528	#define BUILTIN_FUNC_COSH 6
	529	#define BUILTIN_FUNC_EXP 7
	530	#define BUILTIN_FUNC_FLOOR 8
	531	#define BUILTIN_FUNC_FMOD 9
	532	#define BUILTIN_FUNC_HYPOT 10
	533	#define BUILTIN_FUNC_LOG 11
	534	#define BUILTIN_FUNC_LOG10 12
	535	#define BUILTIN_FUNC_POW 13
	536	#define BUILTIN_FUNC_SIN 14
	537	#define BUILTIN_FUNC_SINH 15
	538	#define BUILTIN_FUNC_SQRT 16
	539	#define BUILTIN_FUNC_TAN 17
	540	#define BUILTIN_FUNC_TANH 18
	541	#define BUILTIN_FUNC_ABS 19
	542	#define BUILTIN_FUNC_DOUBLE 20
	543	#define BUILTIN_FUNC_INT 21
	544	#define BUILTIN_FUNC_RAND 22
	545	#define BUILTIN_FUNC_ROUND 23
	546	#define BUILTIN_FUNC_SRAND 24
	547
	548	#define LAST_BUILTIN_FUNC BUILTIN_FUNC_SRAND
	549
	550	/*
	551	* Table describing the built-in math functions. Entries in this table are
	552	* indexed by the values of the INST_CALL_BUILTIN_FUNC instruction's
	553	* operand byte.
	554	*/
	555
	556	typedef int (CallBuiltinFuncProc) _ANSI_ARGS_((Tcl_Interp *interp,
	557	ExecEnv *eePtr, ClientData clientData));
	558
	559	typedef struct {
	560	char name; / Name of function. */
	561	int numArgs; /* Number of arguments for function. */
	562	Tcl_ValueType argTypes[MAX_MATH_ARGS];
	563	/* Acceptable types for each argument. */
	564	CallBuiltinFuncProc proc; / Procedure implementing this function. */
	565	ClientData clientData; /* Additional argument to pass to the
	566	* function when invoking it. */
	567	} BuiltinFunc;
	568
	569	extern BuiltinFunc builtinFuncTable[];
	570
	571	/*
	572	* The structure used to hold information about the start and end of each
	573	* argument word in a command.
	574	*/
	575
	576	#define ARGINFO_INIT_ENTRIES 5
	577
	578	typedef struct ArgInfo {
	579	int numArgs; /* Number of argument words in command. */
	580	char *startArray; / Array of pointers to the first character
	581	* of each argument word. */
	582	char *endArray; / Array of pointers to the last character
	583	* of each argument word. */
	584	int allocArgs; /* Number of array entries currently
	585	* allocated. */
	586	int mallocedArrays; /* 1 if the arrays were expanded and
	587	* wordStartArray/wordEndArray point into
	588	* the heap, else 0. */
	589	char *staticStartSpace[ARGINFO_INIT_ENTRIES];
	590	/* Initial storage for word start array. */
	591	char *staticEndSpace[ARGINFO_INIT_ENTRIES];
	592	/* Initial storage for word end array. */
	593	} ArgInfo;
	594
	595	/*
	596	* Compilation of some Tcl constructs such as if commands and the logical or
	597	* (\|\|) and logical and (&&) operators in expressions requires the
	598	* generation of forward jumps. Since the PC target of these jumps isn't
	599	* known when the jumps are emitted, we record the offset of each jump in an
	600	* array of JumpFixup structures. There is one array for each sequence of
	601	* jumps to one target PC. When we learn the target PC, we update the jumps
	602	* with the correct distance. Also, if the distance is too great (> 127
	603	* bytes), we replace the single-byte jump with a four byte jump
	604	* instruction, move the instructions after the jump down, and update the
	605	* code offsets for any commands between the jump and the target.
	606	*/
	607
	608	typedef enum {
	609	TCL_UNCONDITIONAL_JUMP,
	610	TCL_TRUE_JUMP,
	611	TCL_FALSE_JUMP
	612	} TclJumpType;
	613
	614	typedef struct JumpFixup {
	615	TclJumpType jumpType; /* Indicates the kind of jump. */
	616	int codeOffset; /* Offset of the first byte of the one-byte
	617	* forward jump's code. */
	618	int cmdIndex; /* Index of the first command after the one
	619	* for which the jump was emitted. Used to
	620	* update the code offsets for subsequent
	621	* commands if the two-byte jump at jumpPc
	622	* must be replaced with a five-byte one. */
	623	int excRangeIndex; /* Index of the first range entry in the
	624	* ExceptionRange array after the current
	625	* one. This field is used to adjust the
	626	* code offsets in subsequent ExceptionRange
	627	* records when a jump is grown from 2 bytes
	628	* to 5 bytes. */
	629	} JumpFixup;
	630
	631	#define JUMPFIXUP_INIT_ENTRIES 10
	632
	633	typedef struct JumpFixupArray {
	634	JumpFixup fixup; / Points to start of jump fixup array. */
	635	int next; /* Index of next free array entry. */
	636	int end; /* Index of last usable entry in array. */
	637	int mallocedArray; /* 1 if array was expanded and fixups points
	638	* into the heap, else 0. */
	639	JumpFixup staticFixupSpace[JUMPFIXUP_INIT_ENTRIES];
	640	/* Initial storage for jump fixup array. */
	641	} JumpFixupArray;
	642
	643	/*
	644	* The structure describing one variable list of a foreach command. Note
	645	* that only foreach commands inside procedure bodies are compiled inline so
	646	* a ForeachVarList structure always describes local variables. Furthermore,
	647	* only scalar variables are supported for inline-compiled foreach loops.
	648	*/
	649
	650	typedef struct ForeachVarList {
	651	int numVars; /* The number of variables in the list. */
	652	int varIndexes[1]; /* An array of the indexes ("slot numbers")
	653	* for each variable in the procedure's
	654	* array of local variables. Only scalar
	655	* variables are supported. The actual
	656	* size of this field will be large enough
	657	* to numVars indexes. THIS MUST BE THE
	658	* LAST FIELD IN THE STRUCTURE! */
	659	} ForeachVarList;
	660
	661	/*
	662	* Structure used to hold information about a foreach command that is needed
	663	* during program execution. These structures are stored in CompileEnv and
	664	* ByteCode structures as auxiliary data.
	665	*/
	666
	667	typedef struct ForeachInfo {
	668	int numLists; /* The number of both the variable and value
	669	* lists of the foreach command. */
	670	int firstListTmp; /* The slot number of the first temporary
	671	* variable holding the lists themselves. */
	672	int loopIterNumTmp; /* The slot number of the temp var holding
	673	* the count of times the loop body has been
	674	* executed. This is used to determine which
	675	* list element to assign each loop var. */
	676	ForeachVarList varLists[1];/ An array of pointers to ForeachVarList
	677	* structures describing each var list. The
	678	* actual size of this field will be large
	679	* enough to numVars indexes. THIS MUST BE
	680	* THE LAST FIELD IN THE STRUCTURE! */
	681	} ForeachInfo;
	682
	683	/*
	684	* Structure containing a cached pointer to a command that is the result
	685	* of resolving the command's name in some namespace. It is the internal
	686	* representation for a cmdName object. It contains the pointer along
	687	* with some information that is used to check the pointer's validity.
	688	*/
	689
	690	typedef struct ResolvedCmdName {
	691	Command cmdPtr; / A cached Command pointer. */
	692	Namespace refNsPtr; / Points to the namespace containing the
	693	* reference (not the namespace that
	694	* contains the referenced command). */
	695	long refNsId; /* refNsPtr's unique namespace id. Used to
	696	* verify that refNsPtr is still valid
	697	* (e.g., it's possible that the cmd's
	698	* containing namespace was deleted and a
	699	* new one created at the same address). */
	700	int refNsCmdEpoch; /* Value of the referencing namespace's
	701	* cmdRefEpoch when the pointer was cached.
	702	* Before using the cached pointer, we check
	703	* if the namespace's epoch was incremented;
	704	* if so, this cached pointer is invalid. */
	705	int cmdEpoch; /* Value of the command's cmdEpoch when this
	706	* pointer was cached. Before using the
	707	* cached pointer, we check if the cmd's
	708	* epoch was incremented; if so, the cmd was
	709	* renamed, deleted, hidden, or exposed, and
	710	* so the pointer is invalid. */
	711	int refCount; /* Reference count: 1 for each cmdName
	712	* object that has a pointer to this
	713	* ResolvedCmdName structure as its internal
	714	* rep. This structure can be freed when
	715	* refCount becomes zero. */
	716	} ResolvedCmdName;
	717
	718	/*
	719	*----------------------------------------------------------------
	720	* Procedures shared among Tcl bytecode compilation and execution
	721	* modules but not used outside:
	722	*----------------------------------------------------------------
	723	*/
	724
	725	EXTERN void TclCleanupByteCode _ANSI_ARGS_((ByteCode *codePtr));
	726	EXTERN int TclCompileExpr _ANSI_ARGS_((Tcl_Interp *interp,
	727	char string, char lastChar, int flags,
	728	CompileEnv *envPtr));
	729	EXTERN int TclCompileQuotes _ANSI_ARGS_((Tcl_Interp *interp,
	730	char string, char lastChar, int termChar,
	731	int flags, CompileEnv *envPtr));
	732	EXTERN int TclCompileString _ANSI_ARGS_((Tcl_Interp *interp,
	733	char string, char lastChar, int flags,
	734	CompileEnv *envPtr));
	735	EXTERN int TclCompileDollarVar _ANSI_ARGS_((Tcl_Interp *interp,
	736	char string, char lastChar, int flags,
	737	CompileEnv *envPtr));
	738	EXTERN int TclCreateAuxData _ANSI_ARGS_((ClientData clientData,
	739	AuxDataType typePtr, CompileEnv envPtr));
	740	EXTERN ExecEnv * TclCreateExecEnv _ANSI_ARGS_((Tcl_Interp *interp));
	741	EXTERN void TclDeleteExecEnv _ANSI_ARGS_((ExecEnv *eePtr));
	742	EXTERN void TclEmitForwardJump _ANSI_ARGS_((CompileEnv *envPtr,
	743	TclJumpType jumpType, JumpFixup *jumpFixupPtr));
	744	EXTERN AuxDataType TclGetAuxDataType _ANSI_ARGS_((char typeName));
	745	EXTERN ExceptionRange * TclGetExceptionRangeForPc _ANSI_ARGS_((
	746	unsigned char *pc, int catchOnly,
	747	ByteCode* codePtr));
	748	EXTERN InstructionDesc * TclGetInstructionTable _ANSI_ARGS_(());
	749	EXTERN int TclExecuteByteCode _ANSI_ARGS_((Tcl_Interp *interp,
	750	ByteCode *codePtr));
	751	EXTERN void TclExpandCodeArray _ANSI_ARGS_((
	752	CompileEnv *envPtr));
	753	EXTERN void TclExpandJumpFixupArray _ANSI_ARGS_((
	754	JumpFixupArray *fixupArrayPtr));
	755	EXTERN void TclFinalizeAuxDataTypeTable _ANSI_ARGS_((void));
	756	EXTERN int TclFixupForwardJump _ANSI_ARGS_((
	757	CompileEnv envPtr, JumpFixup jumpFixupPtr,
	758	int jumpDist, int distThreshold));
	759	EXTERN void TclFreeCompileEnv _ANSI_ARGS_((CompileEnv *envPtr));
	760	EXTERN void TclFreeJumpFixupArray _ANSI_ARGS_((
	761	JumpFixupArray *fixupArrayPtr));
	762	EXTERN void TclInitAuxDataTypeTable _ANSI_ARGS_((void));
	763	EXTERN void TclInitByteCodeObj _ANSI_ARGS_((Tcl_Obj *objPtr,
	764	CompileEnv *envPtr));
	765	EXTERN void TclInitCompileEnv _ANSI_ARGS_((Tcl_Interp *interp,
	766	CompileEnv envPtr, char string));
	767	EXTERN void TclInitJumpFixupArray _ANSI_ARGS_((
	768	JumpFixupArray *fixupArrayPtr));
	769	EXTERN int TclObjIndexForString _ANSI_ARGS_((char *start,
	770	int length, int allocStrRep, int inHeap,
	771	CompileEnv *envPtr));
[d4f8a8c]	772	EXTERN void TclPrintSource _ANSI_ARGS_((FILE *outFile,
	773	char *string, int maxChars));
[d7d2da3]	774	EXTERN void TclRegisterAuxDataType _ANSI_ARGS_((AuxDataType *typePtr));
	775
	776	/*
	777	*----------------------------------------------------------------
	778	* Macros used by Tcl bytecode compilation and execution modules
	779	* inside the Tcl core but not used outside.
	780	*----------------------------------------------------------------
	781	*/
	782
	783	/*
	784	* Macros to ensure there is enough room in a CompileEnv's code array.
	785	* The ANSI C "prototypes" for these macros are:
	786	*
	787	* EXTERN void TclEnsureCodeSpace1 _ANSI_ARGS_((CompileEnv *envPtr));
	788	* EXTERN void TclEnsureCodeSpace _ANSI_ARGS_((int nBytes,
	789	* CompileEnv *envPtr));
	790	*/
	791
	792	#define TclEnsureCodeSpace1(envPtr) \
	793	if ((envPtr)->codeNext == (envPtr)->codeEnd) \
	794	TclExpandCodeArray(envPtr)
	795
	796	#define TclEnsureCodeSpace(nBytes, envPtr) \
	797	if (((envPtr)->codeNext + nBytes) > (envPtr)->codeEnd) \
	798	TclExpandCodeArray(envPtr)
	799
	800	/*
	801	* Macro to emit an opcode byte into a CompileEnv's code array.
	802	* The ANSI C "prototype" for this macro is:
	803	*
	804	* EXTERN void TclEmitOpcode _ANSI_ARGS_((unsigned char op,
	805	* CompileEnv *envPtr));
	806	*/
	807
	808	#define TclEmitOpcode(op, envPtr) \
	809	TclEnsureCodeSpace1(envPtr); \
	810	*(envPtr)->codeNext++ = (unsigned char) (op)
	811
	812	/*
	813	* Macros to emit a (signed or unsigned) int operand. The two variants
	814	* depend on the number of bytes needed for the int. Four byte integers
	815	* are stored in "big-endian" order with the high order byte stored at
	816	* the lowest address. The ANSI C "prototypes" for these macros are:
	817	*
	818	* EXTERN void TclEmitInt1 _ANSI_ARGS_((int i, CompileEnv *envPtr));
	819	* EXTERN void TclEmitInt4 _ANSI_ARGS_((int i, CompileEnv *envPtr));
	820	*/
	821
	822	#define TclEmitInt1(i, envPtr) \
	823	TclEnsureCodeSpace(1, (envPtr)); \
	824	*(envPtr)->codeNext++ = (unsigned char) ((unsigned int) (i))
	825
	826	#define TclEmitInt4(i, envPtr) \
	827	TclEnsureCodeSpace(4, (envPtr)); \
	828	*(envPtr)->codeNext++ = \
	829	(unsigned char) ((unsigned int) (i) >> 24); \
	830	*(envPtr)->codeNext++ = \
	831	(unsigned char) ((unsigned int) (i) >> 16); \
	832	*(envPtr)->codeNext++ = \
	833	(unsigned char) ((unsigned int) (i) >> 8); \
	834	*(envPtr)->codeNext++ = \
	835	(unsigned char) ((unsigned int) (i) )
	836
	837	/*
	838	* Macros to emit an instruction with signed or unsigned int operands.
	839	* The ANSI C "prototypes" for these macros are:
	840	*
	841	* EXTERN void TclEmitInstInt1 _ANSI_ARGS_((unsigned char op, int i,
	842	* CompileEnv *envPtr));
	843	* EXTERN void TclEmitInstInt4 _ANSI_ARGS_((unsigned char op, int i,
	844	* CompileEnv *envPtr));
	845	* EXTERN void TclEmitInstUInt1 _ANSI_ARGS_((unsigned char op,
	846	* unsigned int i, CompileEnv *envPtr));
	847	* EXTERN void TclEmitInstUInt4 _ANSI_ARGS_((unsigned char op,
	848	* unsigned int i, CompileEnv *envPtr));
	849	*/
	850
	851	#define TclEmitInstInt1(op, i, envPtr) \
	852	TclEnsureCodeSpace(2, (envPtr)); \
	853	*(envPtr)->codeNext++ = (unsigned char) (op); \
	854	*(envPtr)->codeNext++ = (unsigned char) ((unsigned int) (i))
	855
	856	#define TclEmitInstInt4(op, i, envPtr) \
	857	TclEnsureCodeSpace(5, (envPtr)); \
	858	*(envPtr)->codeNext++ = (unsigned char) (op); \
	859	*(envPtr)->codeNext++ = \
	860	(unsigned char) ((unsigned int) (i) >> 24); \
	861	*(envPtr)->codeNext++ = \
	862	(unsigned char) ((unsigned int) (i) >> 16); \
	863	*(envPtr)->codeNext++ = \
	864	(unsigned char) ((unsigned int) (i) >> 8); \
	865	*(envPtr)->codeNext++ = \
	866	(unsigned char) ((unsigned int) (i) )
	867
	868	#define TclEmitInstUInt1(op, i, envPtr) \
	869	TclEmitInstInt1((op), (i), (envPtr))
	870
	871	#define TclEmitInstUInt4(op, i, envPtr) \
	872	TclEmitInstInt4((op), (i), (envPtr))
	873
	874	/*
	875	* Macro to push a Tcl object onto the Tcl evaluation stack. It emits the
	876	* object's one or four byte array index into the CompileEnv's code
	877	* array. These support, respectively, a maximum of 256 (28) and 232
	878	* objects in a CompileEnv. The ANSI C "prototype" for this macro is:
	879	*
	880	* EXTERN void TclEmitPush _ANSI_ARGS_((int objIndex, CompileEnv *envPtr));
	881	*/
	882
	883	#define TclEmitPush(objIndex, envPtr) \
	884	if ((objIndex) <= 255) { \
	885	TclEmitInstUInt1(INST_PUSH1, (objIndex), (envPtr)); \
	886	} else { \
	887	TclEmitInstUInt4(INST_PUSH4, (objIndex), (envPtr)); \
	888	}
	889
	890	/*
	891	* Macros to update a (signed or unsigned) integer starting at a pointer.
	892	* The two variants depend on the number of bytes. The ANSI C "prototypes"
	893	* for these macros are:
	894	*
	895	* EXTERN void TclStoreInt1AtPtr _ANSI_ARGS_((int i, unsigned char *p));
	896	* EXTERN void TclStoreInt4AtPtr _ANSI_ARGS_((int i, unsigned char *p));
	897	*/
	898
	899	#define TclStoreInt1AtPtr(i, p) \
	900	*(p) = (unsigned char) ((unsigned int) (i))
	901
	902	#define TclStoreInt4AtPtr(i, p) \
	903	*(p) = (unsigned char) ((unsigned int) (i) >> 24); \
	904	*(p+1) = (unsigned char) ((unsigned int) (i) >> 16); \
	905	*(p+2) = (unsigned char) ((unsigned int) (i) >> 8); \
	906	*(p+3) = (unsigned char) ((unsigned int) (i) )
	907
	908	/*
	909	* Macros to update instructions at a particular pc with a new op code
	910	* and a (signed or unsigned) int operand. The ANSI C "prototypes" for
	911	* these macros are:
	912	*
	913	* EXTERN void TclUpdateInstInt1AtPc _ANSI_ARGS_((unsigned char op, int i,
	914	* unsigned char *pc));
	915	* EXTERN void TclUpdateInstInt4AtPc _ANSI_ARGS_((unsigned char op, int i,
	916	* unsigned char *pc));
	917	*/
	918
	919	#define TclUpdateInstInt1AtPc(op, i, pc) \
	920	*(pc) = (unsigned char) (op); \
	921	TclStoreInt1AtPtr((i), ((pc)+1))
	922
	923	#define TclUpdateInstInt4AtPc(op, i, pc) \
	924	*(pc) = (unsigned char) (op); \
	925	TclStoreInt4AtPtr((i), ((pc)+1))
	926
	927	/*
	928	* Macros to get a signed integer (GET_INT{1,2}) or an unsigned int
	929	* (GET_UINT{1,2}) from a pointer. There are two variants for each
	930	* return type that depend on the number of bytes fetched.
	931	* The ANSI C "prototypes" for these macros are:
	932	*
	933	* EXTERN int TclGetInt1AtPtr _ANSI_ARGS_((unsigned char *p));
	934	* EXTERN int TclGetInt4AtPtr _ANSI_ARGS_((unsigned char *p));
	935	* EXTERN unsigned int TclGetUInt1AtPtr _ANSI_ARGS_((unsigned char *p));
	936	* EXTERN unsigned int TclGetUInt4AtPtr _ANSI_ARGS_((unsigned char *p));
	937	*/
	938
	939	/*
	940	* The TclGetInt1AtPtr macro is tricky because we want to do sign
	941	* extension on the 1-byte value. Unfortunately the "char" type isn't
	942	* signed on all platforms so sign-extension doesn't always happen
	943	* automatically. Sometimes we can explicitly declare the pointer to be
	944	* signed, but other times we have to explicitly sign-extend the value
	945	* in software.
	946	*/
	947
	948	#ifndef __CHAR_UNSIGNED__
	949	# define TclGetInt1AtPtr(p) ((int) ((char ) p))
	950	#else
	951	# ifdef HAVE_SIGNED_CHAR
	952	# define TclGetInt1AtPtr(p) ((int) ((signed char ) p))
	953	# else
	954	# define TclGetInt1AtPtr(p) (((int) ((char ) p)) \
	955	\| ((*(p) & 0200) ? (-256) : 0))
	956	# endif
	957	#endif
	958
	959	#define TclGetInt4AtPtr(p) (((int) TclGetInt1AtPtr(p) << 24) \| \
	960	(*((p)+1) << 16) \| \
	961	(*((p)+2) << 8) \| \
	962	(*((p)+3)))
	963
	964	#define TclGetUInt1AtPtr(p) ((unsigned int) *(p))
	965	#define TclGetUInt4AtPtr(p) ((unsigned int) (*(p) << 24) \| \
	966	(*((p)+1) << 16) \| \
	967	(*((p)+2) << 8) \| \
	968	(*((p)+3)))
	969
	970	/*
	971	* Macros used to compute the minimum and maximum of two integers.
	972	* The ANSI C "prototypes" for these macros are:
	973	*
	974	* EXTERN int TclMin _ANSI_ARGS_((int i, int j));
	975	* EXTERN int TclMax _ANSI_ARGS_((int i, int j));
	976	*/
	977
	978	#define TclMin(i, j) ((((int) i) < ((int) j))? (i) : (j))
	979	#define TclMax(i, j) ((((int) i) > ((int) j))? (i) : (j))
	980
	981	/*
	982	* Macro used to compute the offset of the current instruction in the
	983	* bytecode instruction stream. The ANSI C "prototypes" for this macro is:
	984	*
	985	* EXTERN int TclCurrCodeOffset _ANSI_ARGS_((void));
	986	*/
	987
	988	#define TclCurrCodeOffset() ((envPtr)->codeNext - (envPtr)->codeStart)
	989
	990	/*
	991	* Upper bound for legal jump distances. Checked during compilation if
	992	* debugging.
	993	*/
	994
	995	#define MAX_JUMP_DIST 5000
	996
	997	# undef TCL_STORAGE_CLASS
	998	# define TCL_STORAGE_CLASS DLLIMPORT
	999
	1000	#endif /* _TCLCOMPILATION */

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