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Fixed the ca65 Assembly-code variable ".paramcount".

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Fixed how it's described in the ca65 document.
This commit is contained in:
Greg King
2015-11-17 14:11:30 -05:00
parent b6f429f934
commit 3c8c62c6ab
3 changed files with 259 additions and 240 deletions
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155
doc/ca65.sgml
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@@ -2,8 +2,9 @@
<article>
<title>ca65 Users Guide
<author><url url="mailto:uz@cc65.org" name="Ullrich von Bassewitz">
<date>2015-08-01
<author><url url="mailto:uz@cc65.org" name="Ullrich von Bassewitz">,<newline>
<url url="mailto:greg.king5@verizon.net" name="Greg King">
<date>2015-11-17
<abstract>
ca65 is a powerful macro assembler for the 6502, 65C02, and 65816 CPUs. It is
@@ -3935,10 +3936,10 @@ In its simplest form, a macro does not have parameters. Here's an
example:
<tscreen><verb>
.macro asr ; Arithmetic shift right
.macro asr ; Arithmetic shift right
cmp #$80 ; Put bit 7 into carry
ror ; Rotate right with carry
.endmacro
.endmacro
</verb></tscreen>
The macro above consists of two real instructions, that are inserted into
@@ -3957,15 +3958,15 @@ by using the name, like this:
When using macro parameters, macros can be even more useful:
<tscreen><verb>
.macro inc16 addr
.macro inc16 addr
clc
lda addr
adc #$01
adc #<$0001
sta addr
lda addr+1
adc #$00
adc #>$0001
sta addr+1
.endmacro
.endmacro
</verb></tscreen>
When calling the macro, you may give a parameter, and each occurrence of
@@ -3981,10 +3982,10 @@ will be expanded to
<tscreen><verb>
clc
lda $1000
adc #$01
adc #<$0001
sta $1000
lda $1000+1
adc #$00
adc #>$0001
sta $1000+1
</verb></tscreen>
@@ -4006,20 +4007,20 @@ opposite.
Look at this example:
<tscreen><verb>
.macro ldaxy a, x, y
.ifnblank a
.macro ldaxy a, x, y
.ifnblank a
lda #a
.endif
.ifnblank x
.endif
.ifnblank x
ldx #x
.endif
.ifnblank y
.endif
.ifnblank y
ldy #y
.endif
.endmacro
.endif
.endmacro
</verb></tscreen>
This macro may be called as follows:
That macro may be called as follows:
<tscreen><verb>
ldaxy 1, 2, 3 ; Load all three registers
@@ -4029,9 +4030,9 @@ This macro may be called as follows:
ldaxy , , 3 ; Load y only
</verb></tscreen>
There's another helper command for determining, which macro parameters are
valid: <tt><ref id=".PARAMCOUNT" name=".PARAMCOUNT"></tt> This command is
replaced by the parameter count given, <em/including/ intermediate empty macro
There's another helper command for determining which macro parameters are
valid: <tt><ref id=".PARAMCOUNT" name=".PARAMCOUNT"></tt>. That command is
replaced by the parameter count given, <em/including/ explicitly empty
parameters:
<tscreen><verb>
@@ -4047,19 +4048,19 @@ inclusion of tokens that would otherwise terminate the parameter (the comma in
case of a macro parameter).
<tscreen><verb>
.macro foo arg1, arg2
.macro foo arg1, arg2
...
.endmacro
.endmacro
foo ($00,x) ; Two parameters passed
foo {($00,x)} ; One parameter passed
</verb></tscreen>
In the first case, the macro is called with two parameters: '<tt/(&dollar;00/'
and 'x)'. The comma is not passed to the macro, since it is part of the
and '<tt/x)/'. The comma is not passed to the macro, because it is part of the
calling sequence, not the parameters.
In the second case, '(&dollar;00,x)' is passed to the macro, this time
In the second case, '<tt/(&dollar;00,x)/' is passed to the macro; this time,
including the comma.
@@ -4072,7 +4073,7 @@ id=".MATCH" name=".MATCH">/ and <tt/<ref id=".XMATCH" name=".XMATCH">/
functions will allow you to do exactly this:
<tscreen><verb>
.macro ldax arg
.macro ldax arg
.if (.match (.left (1, {arg}), #))
; immediate mode
lda #<(.right (.tcount ({arg})-1, {arg}))
@@ -4082,7 +4083,7 @@ functions will allow you to do exactly this:
lda arg
ldx 1+(arg)
.endif
.endmacro
.endmacro
</verb></tscreen>
Using the <tt/<ref id=".MATCH" name=".MATCH">/ function, the macro is able to
@@ -4096,10 +4097,10 @@ as end-of-list.
The macro can be used as
<tscreen><verb>
foo: .word $5678
...
foo: .word $5678
...
ldax #$1234 ; X=$12, A=$34
...
...
ldax foo ; X=$56, A=$78
</verb></tscreen>
@@ -4109,33 +4110,33 @@ The macro can be used as
Macros may be used recursively:
<tscreen><verb>
.macro push r1, r2, r3
.macro push r1, r2, r3
lda r1
pha
.if .paramcount > 1
.ifnblank r2
push r2, r3
.endif
.endmacro
.endif
.endmacro
</verb></tscreen>
There's also a special macro to help writing recursive macros: <tt><ref
id=".EXITMACRO" name=".EXITMACRO"></tt> This command will stop macro expansion
immediately:
There's also a special macro command to help with writing recursive macros:
<tt><ref id=".EXITMACRO" name=".EXITMACRO"></tt>. That command will stop macro
expansion immediately:
<tscreen><verb>
.macro push r1, r2, r3, r4, r5, r6, r7
.ifblank r1
.macro push r1, r2, r3, r4, r5, r6, r7
.ifblank r1
; First parameter is empty
.exitmacro
.else
.else
lda r1
pha
.endif
.endif
push r2, r3, r4, r5, r6, r7
.endmacro
.endmacro
</verb></tscreen>
When expanding this macro, the expansion will push all given parameters
When expanding that macro, the expansion will push all given parameters
until an empty one is encountered. The macro may be called like this:
<tscreen><verb>
@@ -4151,27 +4152,27 @@ Now, with recursive macros, <tt><ref id=".IFBLANK" name=".IFBLANK"></tt> and
Have a look at the inc16 macro above. Here is it again:
<tscreen><verb>
.macro inc16 addr
.macro inc16 addr
clc
lda addr
adc #$01
adc #<$0001
sta addr
lda addr+1
adc #$00
adc #>$0001
sta addr+1
.endmacro
.endmacro
</verb></tscreen>
If you have a closer look at the code, you will notice, that it could be
written more efficiently, like this:
<tscreen><verb>
.macro inc16 addr
.macro inc16 addr
inc addr
bne Skip
inc addr+1
Skip:
.endmacro
Skip:
.endmacro
</verb></tscreen>
But imagine what happens, if you use this macro twice? Since the label "Skip"
@@ -4183,27 +4184,27 @@ local variables are replaced by a unique name in each separate macro
expansion. So we can solve the problem above by using <tt/.LOCAL/:
<tscreen><verb>
.macro inc16 addr
.macro inc16 addr
.local Skip ; Make Skip a local symbol
inc addr
bne Skip
inc addr+1
Skip: ; Not visible outside
.endmacro
Skip: ; Not visible outside
.endmacro
</verb></tscreen>
Another solution is of course to start a new lexical block inside the macro
that hides any labels:
<tscreen><verb>
.macro inc16 addr
.proc
.macro inc16 addr
.proc
inc addr
bne Skip
inc addr+1
Skip:
.endproc
.endmacro
Skip:
.endproc
.endmacro
</verb></tscreen>
@@ -4254,16 +4255,16 @@ To emulate assemblers that use "<tt/EQU/" instead of "<tt/=/" you may use the
following <tt/.DEFINE/:
<tscreen><verb>
.define EQU =
.define EQU =
foo EQU $1234 ; This is accepted now
foo EQU $1234 ; This is accepted now
</verb></tscreen>
You may use the directive to define string constants used elsewhere:
<tscreen><verb>
; Define the version number
.define VERSION "12.3a"
; Define the version number
.define VERSION "12.3a"
; ... and use it
.asciiz VERSION
@@ -4272,7 +4273,7 @@ You may use the directive to define string constants used elsewhere:
Macros with parameters may also be useful:
<tscreen><verb>
.define DEBUG(message) .out message
.define DEBUG(message) .out message
DEBUG "Assembling include file #3"
</verb></tscreen>
@@ -4283,12 +4284,12 @@ detect the end of one parameter, only the first token is used. If you
don't like that, use classic macros instead:
<tscreen><verb>
.macro DEBUG message
.macro DEBUG message
.out message
.endmacro
.endmacro
</verb></tscreen>
(This is an example where a problem can be solved with both macro types).
(That is an example where a problem can be solved with both macro types).
<sect1>Characters in macros<p>
@@ -4308,12 +4309,12 @@ be sure to take the translation into account.
<sect1>Deleting macros<p>
Macros can be deleted. This will not work if the macro that should be deleted
is currently expanded as in the following non working example:
is currently expanded as in the following non-working example:
<tscreen><verb>
.macro notworking
.macro notworking
.delmacro notworking
.endmacro
.endmacro
notworking ; Will not work
</verb></tscreen>
@@ -4324,16 +4325,16 @@ for <tt><ref id=".DEFINE" name=".DEFINE"></tt> style macros, <tt><ref
id=".UNDEFINE" name=".UNDEFINE"></tt> must be used. Example:
<tscreen><verb>
.define value 1
.macro mac
.define value 1
.macro mac
.byte 2
.endmacro
.endmacro
.byte value ; Emit one byte with value 1
mac ; Emit another byte with value 2
.undefine value
.delmacro mac
.undefine value
.delmacro mac
.byte value ; Error: Unknown identifier
mac ; Error: Missing ":"
@@ -4348,6 +4349,7 @@ argument to <tt>.UNDEFINE</tt> is not allowed to come from another
different commands increases flexibility.
<sect>Macro packages<label id="macropackages"><p>
Using the <tt><ref id=".MACPACK" name=".MACPACK"></tt> directive, predefined
@@ -4862,6 +4864,3 @@ freely, subject to the following restrictions:
</article>

50
src/ca65/macro.c
View File

@@ -147,7 +147,7 @@ static int DoMacAbort = 0;
/* Counter to create local names for symbols */
static unsigned LocalName = 0;
/* Define style macros disabled if != 0 */
/* Define-style macros disabled if != 0 */
static unsigned DisableDefines = 0;
@@ -422,8 +422,8 @@ void MacDef (unsigned Style)
EnterRawTokenMode ();
NextTok ();
/* If we have a DEFINE style macro, we may have parameters in braces,
** otherwise we may have parameters without braces.
/* If we have a DEFINE-style macro, we may have parameters in parentheses;
** otherwise, we may have parameters without parentheses.
*/
if (Style == MAC_STYLE_CLASSIC) {
HaveParams = 1;
@@ -475,7 +475,7 @@ void MacDef (unsigned Style)
}
}
/* For class macros, we expect a separator token, for define style macros,
/* For classic macros, we expect a separator token, for define-style macros,
** we expect the closing paren.
*/
if (Style == MAC_STYLE_CLASSIC) {
@@ -485,9 +485,9 @@ void MacDef (unsigned Style)
}
/* Preparse the macro body. We will read the tokens until we reach end of
** file, or a .endmacro (or end of line for DEFINE style macros) and store
** them into an token list internal to the macro. For classic macros, there
** the .LOCAL command is detected and removed at this time.
** file, or a .endmacro (or end of line for DEFINE-style macros) and store
** them into a token list internal to the macro. For classic macros,
** the .LOCAL command is detected and removed, at this time.
*/
while (1) {
@@ -752,11 +752,11 @@ ExpandParam:
FreeTokNode (Mac->Final);
Mac->Final = 0;
/* Problem: When a .define style macro is expanded within the call
/* Problem: When a .define-style macro is expanded within the call
** of a classic one, the latter may be terminated and removed while
** the expansion of the .define style macro is still active. Because
** the expansion of the .define-style macro is still active. Because
** line info slots are "stacked", this runs into a CHECK FAILED. For
** now, we will fix that by removing the .define style macro expansion
** now, we will fix that by removing the .define-style macro expansion
** immediately, once the final token is placed. The better solution
** would probably be to not require AllocLineInfoSlot/FreeLineInfoSlot
** to be called in FIFO order, but this is a bigger change.
@@ -790,9 +790,11 @@ static void StartExpClassic (MacExp* E)
/* Skip the macro name */
NextTok ();
/* Read the actual parameters */
while (!TokIsSep (CurTok.Tok)) {
/* Does this invocation have any arguments? */
if (!TokIsSep (CurTok.Tok)) {
/* Read the actual parameters */
while (1) {
TokNode* Last;
/* Check for maximum parameter count */
@@ -801,13 +803,12 @@ static void StartExpClassic (MacExp* E)
break;
}
/* The macro may optionally be enclosed in curly braces */
/* The macro argument optionally may be enclosed in curly braces */
Term = GetTokListTerm (TOK_COMMA);
/* Read tokens for one parameter, accept empty params */
Last = 0;
while (CurTok.Tok != Term && CurTok.Tok != TOK_SEP) {
TokNode* T;
/* Check for end of file */
@@ -853,6 +854,7 @@ static void StartExpClassic (MacExp* E)
break;
}
}
}
/* We must be at end of line now, otherwise something is wrong */
ExpectSep ();
@@ -864,9 +866,9 @@ static void StartExpClassic (MacExp* E)
static void StartExpDefine (MacExp* E)
/* Start expanding a DEFINE style macro */
/* Start expanding a DEFINE-style macro */
{
/* A define style macro must be called with as many actual parameters
/* A define-style macro must be called with as many actual parameters
** as there are formal ones. Get the parameter count.
*/
unsigned Count = E->M->ParamCount;
@@ -876,10 +878,9 @@ static void StartExpDefine (MacExp* E)
/* Read the actual parameters */
while (Count--) {
TokNode* Last;
/* The macro may optionally be enclosed in curly braces */
/* The macro argument optionally may be enclosed in curly braces */
token_t Term = GetTokListTerm (TOK_COMMA);
/* Check if there is really a parameter */
@@ -892,7 +893,6 @@ static void StartExpDefine (MacExp* E)
/* Read tokens for one parameter */
Last = 0;
do {
TokNode* T;
/* Get the next token in a node */
@@ -936,7 +936,7 @@ static void StartExpDefine (MacExp* E)
}
/* Macro expansion will overwrite the current token. This is a problem
** for define style macros since these are called from the scanner level.
** for define-style macros since these are called from the scanner level.
** To avoid it, remember the current token and re-insert it, once macro
** expansion is done.
*/
@@ -1007,8 +1007,8 @@ Macro* FindMacro (const StrBuf* Name)
Macro* FindDefine (const StrBuf* Name)
/* Try to find the define style macro with the given name and return it. If no
** such macro was found, return NULL.
/* Try to find the define-style macro with the given name; and, return it.
** If no such macro was found, return NULL.
*/
{
Macro* M;
@@ -1034,7 +1034,7 @@ int InMacExpansion (void)
void DisableDefineStyleMacros (void)
/* Disable define style macros until EnableDefineStyleMacros is called */
/* Disable define-style macros until EnableDefineStyleMacros() is called */
{
++DisableDefines;
}
@@ -1042,8 +1042,8 @@ void DisableDefineStyleMacros (void)
void EnableDefineStyleMacros (void)
/* Re-enable define style macros previously disabled with
** DisableDefineStyleMacros.
/* Re-enable define-style macros previously disabled with
** DisableDefineStyleMacros().
*/
{
PRECONDITION (DisableDefines > 0);

20
testcode/assembler/paramcount.s Normal file
View File

@@ -0,0 +1,20 @@
; Test ca65's handling of the .paramcount read-only variable.
; .paramcount should see all given arguments, even when they are empty.
.macro push r1, r2, r3, r4, r5, r6
.out .sprintf(" .paramcount = %u", .paramcount)
.if .paramcount <> 0
.ifblank r1
.warning "r1 is blank!"
.exitmacro
.endif
lda r1
pha
push r2, r3, r4, r5, r6
.endif
.endmacro
push 1, , {}
push 1, ,
push 1