bilbo/dsp-asm
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grammar: update

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This moves the expression grammar from parser.cpp to grammar.txt.
This commit is contained in:
Zack Buhman 2023-08-23 19:17:10 -07:00
parent 2fe2f0a1a7
commit f51ec95713
2 changed files with 23 additions and 21 deletions
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29
grammar.txt
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@ -1,3 +1,18 @@
expression → term
term → factor ( ( "-" | "+" ) factor )*
factor → unary ( ( "/" | "*" | "%" ) unary )*
unary → ( "~" | "+" | "-" ) unary
| shift
shift → andl ( ( "<<" | ">>" ) andl )*
andl → orl ( "&" orl )*
orl → andl ( ( "|" | "^" ) andl )*
primary → NUMBER
| "(" expression ")"
uimm8 → expression
uimm19 → expression
uimm25 → expression
alu → and | or | xor | add | sub | ad2 | sr | rr | sl | rl | rl8 alu → and | or | xor | add | sub | ad2 | sr | rr | sl | rl | rl8
xy_src → "mc0" | "mc1" | "mc2" | "mc3" xy_src → "mc0" | "mc1" | "mc2" | "mc3"
@ -25,12 +40,14 @@ d1_src → "mc0" | "mc1" | "mc2" | "mc3"
| "m0" | "m1" | "m2" | "m3" | "m0" | "m1" | "m2" | "m3"
| "alh" | "all" | "alh" | "all"
mov_imm_d1 → "mov" simm8 "," d1_dest mov_imm_d1 → "mov" uimm8 "," d1_dest
mov_ram_d1 → "mov" d1_src "," d1_dest mov_ram_d1 → "mov" d1_src "," d1_dest
d1_bus → mov_imm_d1 → mov_ram_d1 d1_bus → mov_imm_d1 → mov_ram_d1
op → ( alu | x_bus | y_bus | d1_bus ) + nop → "nop"
op → ( nop | alu | x_bus | y_bus | d1_bus ) +
load_dest → "mc0" | "mc1" | "mc2" | "mc3" load_dest → "mc0" | "mc1" | "mc2" | "mc3"
| "rx" | "pl" | "rx" | "pl"
@ -60,8 +77,8 @@ dma_dmah → ("dma" | "dmah") add_mode?
dma_length_ram → "m0" | "m1" | "m2" | "m3" dma_length_ram → "m0" | "m1" | "m2" | "m3"
| "mc0" | "mc1" | "mc2" | "mc3" | "mc0" | "mc1" | "mc2" | "mc3"
dma_ingress_imm → dma_dmah "d0" "," dma_ingress "," simm8 dma_ingress_imm → dma_dmah "d0" "," dma_ingress "," uimm8
dma_egress_imm → dma_dmah dma_egress "," "d0" "," simm8 dma_egress_imm → dma_dmah dma_egress "," "d0" "," uimm8
dma_ingress_ram → dma_dmah "d0" "," dma_ingress "," dma_length_ram dma_ingress_ram → dma_dmah "d0" "," dma_ingress "," dma_length_ram
dma_egress_ram → dma_dmah dma_egress "," "d0" "," dma_length_ram dma_egress_ram → dma_dmah dma_egress "," "d0" "," dma_length_ram
@ -82,8 +99,7 @@ loop → "btm" | "lps"
end → "end" | "endi" end → "end" | "endi"
instruction → "nop" instruction → op
| op
| load | load
| dma | dma
| jump | jump
@ -98,4 +114,3 @@ instruction_statement → label? instruction? "\n"
statement → assignment_statement statement → assignment_statement
| instruction_statement | instruction_statement

13
parser.cpp
View File

@ -1,16 +1,3 @@
/*
expression → term ;
term → factor ( ( "-" | "+" ) factor )* ;
factor → unary ( ( "/" | "*" | "%" ) unary )* ;
unary → ( "~" | "+" | "-" ) unary
| shift ;
shift → andl ( ( "<<" | ">>" ) andl )*
andl → orl ( "&" orl )*
orl → andl ( ( "|" | "^" ) andl )*
primary → NUMBER
| "(" expression ")" ;
*/
#include <string> #include <string>
#include <optional> #include <optional>
#include <cassert> #include <cassert>