[antlr-interest] SDF assembly language grammar
Cameron Palmer
cameron.palmer at gmail.com
Thu May 17 22:17:22 PDT 2007
I am a student rewriting the assembler for an ISA called SDF (Scheduled
Dataflow). You can check out our work at http://csrl.unt.edu/sdf . Anyway I
am just writing the grammar and am having trouble making the leap to code
generation. I had started with v2 but figure I might just convert the
grammar to v3 today. The goal of this grammar is to emit opcodes for each
instruction and maintain numeric translations for the labels. I think I
would rather do the label translation as an AST rather than backpatching. I
have attached my grammar and sample assembly. My questions:
Why it seems to stop parsing about the comment line (what am i doing it
wrong?)
Where did the caseSensitiveLiterals option disappear?
Thank you,
Cameron.
A sample of the assembly:
version 2.0.0
.data
.end
code main
putr1 main.1
forkep r1
stop
main.1:
; alloc sum frame
put sum, r4
put 4, r5
falloc r4, r5, r6
; alloc result frame
put main_res, r4
put 1, r5
falloc r4, r5, r7
;
putr1 main.2
forksp r1
stop
The Grammar:
grammar SDF;
@header {
package edu.unt.csrl.sdf.asm;
import java.util.HashMap();
}
@members {
HashMap memory = new HashMap(); // Something like this to hold label values
that will be rewritten
}
program
: (EOL)?
versionSection
dataSection
(codeBlock)*
;
versionSection
: 'version' (.)+ EOL;
dataSection
: DATABEGIN EOL
dsBody
DATAEND EOL;
dsBody
: ID COLON INT EOL
iStructBody
dsBody
| ;
iStructBody
: ('i' | 'ri' | 'f' | 'rf' | 'a' | 'ra' | 'u' | 'ru')=>
iStructElement
iStructBody
| ;
iStructElement
: 'i' INT EOL
| 'ri' INT INT EOL
| 'f' FLOAT EOL
| 'rf' INT FLOAT EOL
| 'a' INT EOL
| 'ra' INT INT EOL
| 'u' EOL
| 'ru' INT EOL;
codeBlock
: 'code' ID EOL
code;
code
: label code
| instruction code
;
label
: ID COLON (EOL)?;
instruction
: 'nop' EOL
| 'add' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'sub' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'mul' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'div' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'mod' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'and' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'or' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'not' reg['r'] COMMA reg['r'] EOL
| 'xor' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'band' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'bor' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'bnot' reg['r'] COMMA reg['r'] EOL
| 'shl' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'shr' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'sar' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'neg' reg['r'] COMMA reg['r'] EOL
| 'max' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'min' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'abs' reg['r'] COMMA reg['r'] EOL
| 'lt' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'le' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'eq' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'ne' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'ge' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'gt' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'tbl' reg['r'] COMMA reg['r'] EOL
| 'tch' reg['r'] COMMA reg['r'] EOL
| 'fadd' reg['f'] COMMA reg['f'] COMMA reg['f'] EOL
| 'fsub' reg['f'] COMMA reg['f'] COMMA reg['f'] EOL
| 'fmul' reg['f'] COMMA reg['f'] COMMA reg['f'] EOL
| 'fdiv' reg['f'] COMMA reg['f'] COMMA reg['f'] EOL
| 'flr' reg['f'] COMMA reg['f'] EOL
| 'ceil' reg['f'] COMMA reg['f'] EOL
| 'flt' reg['f'] COMMA reg['f'] COMMA reg['r'] EOL
| 'fle' reg['f'] COMMA reg['f'] COMMA reg['r'] EOL
| 'feq' reg['f'] COMMA reg['f'] COMMA reg['r'] EOL
| 'fne' reg['f'] COMMA reg['f'] COMMA reg['r'] EOL
| 'fge' reg['f'] COMMA reg['f'] COMMA reg['r'] EOL
| 'fgt' reg['f'] COMMA reg['f'] COMMA reg['r'] EOL
| 'trl' reg['r'] COMMA reg['f'] EOL
| 'tdb' EOL // TODO
| 'tin' reg['f'] COMMA reg['r'] EOL
| 'gput' INT COMMA reg['g'] EOL
| 'gadd' reg['g'] COMMA reg['g'] COMMA reg['g'] EOL
| 'gsub' reg['g'] COMMA reg['g'] COMMA reg['g'] EOL
| 'gmul' reg['g'] COMMA reg['g'] COMMA reg['g'] EOL
| 'gtl' reg['g'] COMMA reg['r'] EOL
| 'ltg' reg['r'] COMMA reg['g'] EOL
| 'move' reg['r'] COMMA reg['r'] EOL
| 'putr1' (INT | ID) EOL
| 'put' (INT | ID) COMMA reg['r'] EOL
| 'load' reg['r'] PIPE (reg['r'] | INT) COMMA reg['r'] EOL
| 'store' reg['r'] COMMA reg['r'] PIPE (reg['r'] | INT) EOL
| 'store1' EOL // TODO
| 'rstore' EOL // TODO
| 'ialloc' reg['r'] COMMA reg['r'] EOL
| 'ifree' reg['r'] EOL
| 'ifetch' reg['r'] PIPE (reg['r'] | INT) COMMA reg['r'] EOL
| 'istore' reg['r'] COMMA reg['r'] PIPE (reg['r'] | INT) EOL
| 'forksp' reg['r'] ( | COMMA reg['r']) EOL
| 'forkep' reg['r'] ( | COMMA reg['r']) EOL
| 'stop' EOL
| 'falloc' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'ralloc' EOL // TODO
| 'ffree' ( | reg['r']) EOL
| 'input' INT COMMA reg['r'] EOL
| 'output' reg['r'] COMMA INT EOL
| 'skip' EOL // TODO
| 'ifchcl' EOL // TODO
| 'pow' reg['r'] COMMA reg['r'] COMMA reg['r'] EOL
| 'sfalloc' EOL // TODO
| 'fput' FLOAT COMMA reg['f'] EOL
| 'finput' INT COMMA reg['f'] EOL
| 'halt' EOL
| 'fmove' reg['f'] COMMA reg['f'] EOL
| 'fneg' reg['f'] COMMA reg['f'] EOL
| 'fabs' reg['f'] COMMA reg['f'] EOL
| 'fmath' INT COMMA reg['f'] COMMA reg['f'] EOL
| 'sforkep' EOL // TODO
| 'sforksp' EOL // TODO
| 'scforksp' EOL // TODO
| 'sffree' EOL // TODO
| 'sread' EOL
;
reg[char type] returns[int rNum = -1]
: rStr=ID {
try {
if(Character.toLowerCase (rStr.charAt(0)) != type)
throw new SemanticException("expected " + type + "x, found "
+ rStr);
if(rStr.equals("RFP"))
rNum = 63;
else
rNum = Integer.parseInt(rStr.substring(1));
} catch(Exception ex) {
throw new SemanticException("expected " + type + "x, found " +
rStr);
}
};
DATABEGIN:
'.data';
DATAEND:
'.end';
COMMENT
: SEMI (.)* EOL {$channel=HIDDEN};
fragment DIGIT
: ('0'..'9');
INT
: ('-')? (DIGIT)+;
FLOAT
: INT '.' (DIGIT)+;
SEMI
: ';';
COLON
: ':';
COMMA
: ',';
PIPE
: '|';
ID
: ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'.'|'0'..'9')*;
EOL
: (('\r')? '\n') {newline();};
WS
: (
| (' ' | '\t')
) { $channel=HIDDEN; }
;
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