1 /*****************************************************************************/
5 /* Macros for the ca65 macroassembler */
9 /* (C) 1998-2011, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
59 /*****************************************************************************/
61 /*****************************************************************************/
65 static unsigned HT_GenHash (const void* Key);
66 /* Generate the hash over a key. */
68 static const void* HT_GetKey (void* Entry);
69 /* Given a pointer to the user entry data, return a pointer to the key */
71 static HashNode* HT_GetHashNode (void* Entry);
72 /* Given a pointer to the user entry data, return a pointer to the hash node */
74 static int HT_Compare (const void* Key1, const void* Key2);
75 /* Compare two keys. The function must return a value less than zero if
76 * Key1 is smaller than Key2, zero if both are equal, and a value greater
77 * than zero if Key1 is greater then Key2.
82 /*****************************************************************************/
84 /*****************************************************************************/
88 /* Struct that describes an identifer (macro param, local list) */
89 typedef struct IdDesc IdDesc;
91 IdDesc* Next; /* Linked list */
92 StrBuf Id; /* Identifier, dynamically allocated */
97 /* Struct that describes a macro definition */
98 typedef struct Macro Macro;
100 HashNode Node; /* Hash list node */
101 Macro* List; /* List of all macros */
102 unsigned LocalCount; /* Count of local symbols */
103 IdDesc* Locals; /* List of local symbols */
104 unsigned ParamCount; /* Parameter count of macro */
105 IdDesc* Params; /* Identifiers of macro parameters */
106 unsigned TokCount; /* Number of tokens for this macro */
107 TokNode* TokRoot; /* Root of token list */
108 TokNode* TokLast; /* Pointer to last token in list */
109 unsigned char Style; /* Macro style */
110 unsigned char Incomplete; /* Macro is currently built */
111 StrBuf Name; /* Macro name, dynamically allocated */
114 /* Hash table functions */
115 static const HashFunctions HashFunc = {
122 /* Macro hash table */
123 static HashTable MacroTab = STATIC_HASHTABLE_INITIALIZER (117, &HashFunc);
125 /* Global macro data */
126 static Macro* MacroRoot = 0; /* List of all macros */
128 /* Structs that holds data for a macro expansion */
129 typedef struct MacExp MacExp;
131 MacExp* Next; /* Pointer to next expansion */
132 Macro* M; /* Which macro do we expand? */
133 unsigned IfSP; /* .IF stack pointer at start of expansion */
134 TokNode* Exp; /* Pointer to current token */
135 TokNode* Final; /* Pointer to final token */
136 unsigned LocalStart; /* Start of counter for local symbol names */
137 unsigned ParamCount; /* Number of actual parameters */
138 TokNode** Params; /* List of actual parameters */
139 TokNode* ParamExp; /* Node for expanding parameters */
140 unsigned LISlot; /* Slot for additional line infos */
143 /* Maximum number of nested macro expansions */
144 #define MAX_MACEXPANSIONS 256U
146 /* Number of active macro expansions */
147 static unsigned MacExpansions = 0;
149 /* Flag if a macro expansion should get aborted */
150 static int DoMacAbort = 0;
152 /* Counter to create local names for symbols */
153 static unsigned LocalName = 0;
157 /*****************************************************************************/
158 /* Hash table functions */
159 /*****************************************************************************/
163 static unsigned HT_GenHash (const void* Key)
164 /* Generate the hash over a key. */
166 return HashBuf (Key);
171 static const void* HT_GetKey (void* Entry)
172 /* Given a pointer to the user entry data, return a pointer to the index */
174 return &((Macro*) Entry)->Name;
179 static HashNode* HT_GetHashNode (void* Entry)
180 /* Given a pointer to the user entry data, return a pointer to the hash node */
182 return &((Macro*) Entry)->Node;
187 static int HT_Compare (const void* Key1, const void* Key2)
188 /* Compare two keys. The function must return a value less than zero if
189 * Key1 is smaller than Key2, zero if both are equal, and a value greater
190 * than zero if Key1 is greater then Key2.
193 return SB_Compare (Key1, Key2);
198 /*****************************************************************************/
200 /*****************************************************************************/
204 static IdDesc* NewIdDesc (const StrBuf* Id)
205 /* Create a new IdDesc, initialize and return it */
207 /* Allocate memory */
208 IdDesc* I = xmalloc (sizeof (IdDesc));
210 /* Initialize the struct */
213 SB_Copy (&I->Id, Id);
215 /* Return the new struct */
221 static Macro* NewMacro (const StrBuf* Name, unsigned char Style)
222 /* Generate a new macro entry, initialize and return it */
224 /* Allocate memory */
225 Macro* M = xmalloc (sizeof (Macro));
227 /* Initialize the macro struct */
228 InitHashNode (&M->Node, M);
239 SB_Copy (&M->Name, Name);
241 /* Insert the macro into the global macro list */
245 /* Insert the macro into the hash table */
246 HT_Insert (&MacroTab, &M->Node);
248 /* Return the new macro struct */
254 static MacExp* NewMacExp (Macro* M)
255 /* Create a new expansion structure for the given macro */
259 /* Allocate memory */
260 MacExp* E = xmalloc (sizeof (MacExp));
262 /* Initialize the data */
264 E->IfSP = GetIfStack ();
267 E->LocalStart = LocalName;
268 LocalName += M->LocalCount;
270 E->Params = xmalloc (M->ParamCount * sizeof (TokNode*));
272 for (I = 0; I < M->ParamCount; ++I) {
275 E->LISlot = AllocLineInfoSlot (LI_TYPE_MACRO, MacExpansions);
277 /* One macro expansion more */
280 /* Return the new macro expansion */
286 static void FreeMacExp (MacExp* E)
287 /* Remove and free the current macro expansion */
291 /* One macro expansion less */
294 /* Free the parameter lists */
295 for (I = 0; I < E->ParamCount; ++I) {
296 /* Free one parameter list */
297 TokNode* N = E->Params[I];
299 TokNode* P = N->Next;
306 /* Free the additional line info slot */
307 FreeLineInfoSlot (E->LISlot);
309 /* Free the final token if we have one */
311 FreeTokNode (E->Final);
314 /* Free the structure itself */
320 static void MacSkipDef (unsigned Style)
321 /* Skip a macro definition */
323 if (Style == MAC_STYLE_CLASSIC) {
324 /* Skip tokens until we reach the final .endmacro */
325 while (CurTok.Tok != TOK_ENDMACRO && CurTok.Tok != TOK_EOF) {
328 if (CurTok.Tok != TOK_EOF) {
331 Error ("`.ENDMACRO' expected");
334 /* Skip until end of line */
341 void MacDef (unsigned Style)
342 /* Parse a macro definition */
348 /* We expect a macro name here */
349 if (CurTok.Tok != TOK_IDENT) {
350 Error ("Identifier expected");
353 } else if (!UbiquitousIdents && FindInstruction (&CurTok.SVal) >= 0) {
354 /* The identifier is a name of a 6502 instruction, which is not
355 * allowed if not explicitly enabled.
357 Error ("Cannot use an instruction as macro name");
362 /* Did we already define that macro? */
363 if (HT_Find (&MacroTab, &CurTok.SVal) != 0) {
364 /* Macro is already defined */
365 Error ("A macro named `%m%p' is already defined", &CurTok.SVal);
366 /* Skip tokens until we reach the final .endmacro */
371 /* Define the macro */
372 M = NewMacro (&CurTok.SVal, Style);
374 /* Switch to raw token mode and skip the macro name */
375 EnterRawTokenMode ();
378 /* If we have a DEFINE style macro, we may have parameters in braces,
379 * otherwise we may have parameters without braces.
381 if (Style == MAC_STYLE_CLASSIC) {
384 if (CurTok.Tok == TOK_LPAREN) {
392 /* Parse the parameter list */
395 while (CurTok.Tok == TOK_IDENT) {
397 /* Create a struct holding the identifier */
398 IdDesc* I = NewIdDesc (&CurTok.SVal);
400 /* Insert the struct into the list, checking for duplicate idents */
401 if (M->ParamCount == 0) {
404 IdDesc* List = M->Params;
406 if (SB_Compare (&List->Id, &CurTok.SVal) == 0) {
407 Error ("Duplicate symbol `%m%p'", &CurTok.SVal);
409 if (List->Next == 0) {
422 /* Maybe there are more params... */
423 if (CurTok.Tok == TOK_COMMA) {
431 /* For class macros, we expect a separator token, for define style macros,
432 * we expect the closing paren.
434 if (Style == MAC_STYLE_CLASSIC) {
436 } else if (HaveParams) {
440 /* Preparse the macro body. We will read the tokens until we reach end of
441 * file, or a .endmacro (or end of line for DEFINE style macros) and store
442 * them into an token list internal to the macro. For classic macros, there
443 * the .LOCAL command is detected and removed at this time.
447 /* Check for end of macro */
448 if (Style == MAC_STYLE_CLASSIC) {
449 /* In classic macros, only .endmacro is allowed */
450 if (CurTok.Tok == TOK_ENDMACRO) {
454 /* May not have end of file in a macro definition */
455 if (CurTok.Tok == TOK_EOF) {
456 Error ("`.ENDMACRO' expected");
460 /* Accept a newline or end of file for new style macros */
461 if (TokIsSep (CurTok.Tok)) {
466 /* Check for a .LOCAL declaration */
467 if (CurTok.Tok == TOK_LOCAL && Style == MAC_STYLE_CLASSIC) {
473 /* Skip .local or comma */
476 /* Need an identifer */
477 if (CurTok.Tok != TOK_IDENT && CurTok.Tok != TOK_LOCAL_IDENT) {
478 Error ("Identifier expected");
483 /* Put the identifier into the locals list and skip it */
484 I = NewIdDesc (&CurTok.SVal);
490 /* Check for end of list */
491 if (CurTok.Tok != TOK_COMMA) {
497 /* We need end of line after the locals */
502 /* Create a token node for the current token */
505 /* If the token is an ident, check if it is a local parameter */
506 if (CurTok.Tok == TOK_IDENT) {
508 IdDesc* I = M->Params;
510 if (SB_Compare (&I->Id, &CurTok.SVal) == 0) {
511 /* Local param name, replace it */
512 N->T.Tok = TOK_MACPARAM;
521 /* Insert the new token in the list */
522 if (M->TokCount == 0) {
524 M->TokRoot = M->TokLast = N;
526 /* We have already tokens */
527 M->TokLast->Next = N;
532 /* Read the next token */
536 /* Skip the .endmacro for a classic macro */
537 if (Style == MAC_STYLE_CLASSIC) {
541 /* Reset the Incomplete flag now that parsing is done */
545 /* Switch out of raw token mode */
546 LeaveRawTokenMode ();
551 static int MacExpand (void* Data)
552 /* If we're currently expanding a macro, set the the scanner token and
553 * attribute to the next value and return true. If we are not expanding
554 * a macro, return false.
557 /* Cast the Data pointer to the actual data structure */
558 MacExp* Mac = (MacExp*) Data;
560 /* Check if we should abort this macro */
566 /* Abort any open .IF statements in this macro expansion */
567 CleanupIfStack (Mac->IfSP);
569 /* Terminate macro expansion */
573 /* We're expanding a macro. Check if we are expanding one of the
578 /* Ok, use token from parameter list */
579 TokSet (Mac->ParamExp, Mac->LISlot);
581 /* Set pointer to next token */
582 Mac->ParamExp = Mac->ParamExp->Next;
589 /* We're not expanding macro parameters. Check if we have tokens left from
594 /* Use next macro token */
595 TokSet (Mac->Exp, Mac->LISlot);
597 /* Set pointer to next token */
598 Mac->Exp = Mac->Exp->Next;
600 /* Is it a request for actual parameter count? */
601 if (CurTok.Tok == TOK_PARAMCOUNT) {
602 CurTok.Tok = TOK_INTCON;
603 CurTok.IVal = Mac->ParamCount;
607 /* Is it the name of a macro parameter? */
608 if (CurTok.Tok == TOK_MACPARAM) {
610 /* Start to expand the parameter token list */
611 Mac->ParamExp = Mac->Params [CurTok.IVal];
613 /* Recursive call to expand the parameter */
614 return MacExpand (Mac);
617 /* If it's an identifier, it may in fact be a local symbol */
618 if ((CurTok.Tok == TOK_IDENT || CurTok.Tok == TOK_LOCAL_IDENT) &&
619 Mac->M->LocalCount) {
620 /* Search for the local symbol in the list */
622 IdDesc* I = Mac->M->Locals;
624 if (SB_Compare (&CurTok.SVal, &I->Id) == 0) {
625 /* This is in fact a local symbol, change the name. Be sure
626 * to generate a local label name if the original name was
627 * a local label, and also generate a name that cannot be
628 * generated by a user.
630 if (SB_At (&I->Id, 0) == LocalStart) {
631 /* Must generate a local symbol */
632 SB_Printf (&CurTok.SVal, "%cLOCAL-MACRO_SYMBOL-%04X",
633 LocalStart, Mac->LocalStart + Index);
636 SB_Printf (&CurTok.SVal, "LOCAL-MACRO_SYMBOL-%04X",
637 Mac->LocalStart + Index);
650 /* The token was successfully set */
655 /* No more macro tokens. Do we have a final token? */
658 /* Set the final token and remove it */
659 TokSet (Mac->Final, Mac->LISlot);
660 FreeTokNode (Mac->Final);
663 /* The token was successfully set */
669 /* End of macro expansion */
672 /* Pop the input function */
675 /* No token available */
681 static void StartExpClassic (Macro* M)
682 /* Start expanding the classic macro M */
688 /* Create a structure holding expansion data. This must be done before
689 * skipping the macro name, because the call to NextTok may cause a new
690 * expansion if the next token is actually a .define style macro.
694 /* Skip the macro name */
697 /* Read the actual parameters */
698 while (!TokIsSep (CurTok.Tok)) {
702 /* Check for maximum parameter count */
703 if (E->ParamCount >= M->ParamCount) {
704 ErrorSkip ("Too many macro parameters");
708 /* The macro may optionally be enclosed in curly braces */
709 Term = GetTokListTerm (TOK_COMMA);
711 /* Read tokens for one parameter, accept empty params */
713 while (CurTok.Tok != Term && CurTok.Tok != TOK_SEP) {
717 /* Check for end of file */
718 if (CurTok.Tok == TOK_EOF) {
719 Error ("Unexpected end of file");
724 /* Get the next token in a node */
727 /* Insert it into the list */
729 E->Params [E->ParamCount] = T;
739 /* One parameter more */
742 /* If the macro argument was enclosed in curly braces, end-of-line
743 * is an error. Skip the closing curly brace.
745 if (Term == TOK_RCURLY) {
746 if (CurTok.Tok == TOK_SEP) {
747 Error ("End of line encountered within macro argument");
753 /* Check for a comma */
754 if (CurTok.Tok == TOK_COMMA) {
761 /* We must be at end of line now, otherwise something is wrong */
764 /* Insert a new token input function */
765 PushInput (MacExpand, E, ".MACRO");
770 static void StartExpDefine (Macro* M)
771 /* Start expanding a DEFINE style macro */
773 /* Create a structure holding expansion data */
774 MacExp* E = NewMacExp (M);
776 /* A define style macro must be called with as many actual parameters
777 * as there are formal ones. Get the parameter count.
779 unsigned Count = M->ParamCount;
781 /* Skip the current token */
784 /* Read the actual parameters */
789 /* The macro may optionally be enclosed in curly braces */
790 token_t Term = GetTokListTerm (TOK_COMMA);
792 /* Check if there is really a parameter */
793 if (TokIsSep (CurTok.Tok) || CurTok.Tok == Term) {
794 ErrorSkip ("Macro parameter #%u is empty", E->ParamCount+1);
799 /* Read tokens for one parameter */
805 /* Get the next token in a node */
808 /* Insert it into the list */
810 E->Params [E->ParamCount] = T;
819 } while (CurTok.Tok != Term && !TokIsSep (CurTok.Tok));
821 /* One parameter more */
824 /* If the macro argument was enclosed in curly braces, end-of-line
825 * is an error. Skip the closing curly brace.
827 if (Term == TOK_RCURLY) {
828 if (TokIsSep (CurTok.Tok)) {
829 Error ("End of line encountered within macro argument");
835 /* Check for a comma */
837 if (CurTok.Tok == TOK_COMMA) {
840 Error ("`,' expected");
845 /* Macro expansion will overwrite the current token. This is a problem
846 * for define style macros since these are called from the scanner level.
847 * To avoid it, remember the current token and re-insert it, once macro
850 E->Final = NewTokNode ();
852 /* Insert a new token input function */
853 PushInput (MacExpand, E, ".DEFINE");
858 void MacExpandStart (void)
859 /* Start expanding the macro in SVal */
861 /* Search for the macro */
862 Macro* M = HT_FindEntry (&MacroTab, &CurTok.SVal);
865 /* We cannot expand an incomplete macro */
867 Error ("Cannot expand an incomplete macro");
871 /* Don't allow too many nested macro expansions - otherwise it is possible
872 * to force an endless loop and assembler crash.
874 if (MacExpansions >= MAX_MACEXPANSIONS) {
875 Error ("Too many nested macro expansions");
879 /* Call the apropriate subroutine */
881 case MAC_STYLE_CLASSIC: StartExpClassic (M); break;
882 case MAC_STYLE_DEFINE: StartExpDefine (M); break;
883 default: Internal ("Invalid macro style: %d", M->Style);
890 /* Abort the current macro expansion */
892 /* Must have an expansion */
893 CHECK (MacExpansions > 0);
895 /* Set a flag so macro expansion will terminate on the next call */
901 int IsMacro (const StrBuf* Name)
902 /* Return true if the given name is the name of a macro */
904 return (HT_Find (&MacroTab, Name) != 0);
909 int IsDefine (const StrBuf* Name)
910 /* Return true if the given name is the name of a define style macro */
912 Macro* M = HT_FindEntry (&MacroTab, Name);
913 return (M != 0 && M->Style == MAC_STYLE_DEFINE);
918 int InMacExpansion (void)
919 /* Return true if we're currently expanding a macro */
921 return (MacExpansions > 0);