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139 lines (109 loc) · 1.88 KB
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// step 9,10
grammar MiniDecaf;
import CommonLex;
prog
: externalDecl+ EOF
;
externalDecl
: func # funcExternalDecl
| decl ';' # declExternalDecl
;
func
: ty Ident '(' paramList ')' block # funcDef
| ty Ident '(' paramList ')' ';' # funcDecl
;
ty
: 'int' # intType
;
stmt
: 'return' expr ';' # returnStmt
| expr ';' # exprStmt
| ';' # nullStmt
| 'if' '(' expr ')' th=stmt ('else' el=stmt)? # IfStmt
| block # blockStmt
| 'for' '(' init=decl ';' ctrl=expr? ';' post=expr? ')' stmt # forDeclStmt
| 'for' '(' init=expr? ';' ctrl=expr? ';' post=expr? ')' stmt # forStmt
| 'while' '(' expr ')' stmt # whileStmt
| 'do' stmt 'while' '(' expr ')' ';' # doWhileStmt
| 'break' ';' # breakStmt
| 'continue' ';' # continueStmt
;
expr
: asgn
;
decl
: ty Ident ('=' expr)?
;
blockItem
: stmt # blockItemStmt
| decl ';' # blockItemDecl
;
block
: '{' blockItem* '}'
;
paramList
: (decl (',' decl)*)?
;
asgn
: cond # tAsgn
| unary asgnOp asgn # cAsgn
;
cond
: lor # tCond
| lor '?' expr ':' cond # cCond
;
lor
: land # tLor
| lor '||' land # cLor
;
land
: eq # tLand
| land '&&' eq # cLand
;
eq
: rel # tEq
| eq eqOp rel # cEq
;
rel
: add # tRel
| rel relOp add # cRel
;
add
: mul # tAdd
| add addOp mul # cAdd
;
mul
: unary # tMul
| mul mulOp unary # cMul
;
unary
: atom # tUnary
| unaryOp unary # cUnary
;
atom
: Integer # atomInteger
| Ident # atomIdent
| '(' expr ')' # atomParen
| Ident '(' argList ')' # atomCall
;
argList
: (expr (',' expr)*)?
;
unaryOp
: '-' | '!' | '~'
;
addOp
: '+' | '-'
;
mulOp
: '*' | '/' | '%'
;
relOp
: '<' | '>' | '<=' | '>='
;
eqOp
: '==' | '!='
;
asgnOp
: '='
;