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source: git/external/tcl/tclCompile.h@ 832ce9e

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Last change on this file since 832ce9e was d7d2da3, checked in by pavel <pavel@…>, 12 years ago
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Property mode set to `100644`
File size: 41.8 KB

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[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	* 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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