Initial commit from sysy-main

2025-02-27 23:14:53 +08:00
commit cc523fd30b
1125 changed files with 257793 additions and 0 deletions
--- a/src/SysY.g4
+++ b/src/SysY.g4
@@ -0,0 +1,122 @@
+grammar SysY;
+
+/*===-------------------------------------------===*/
+/* Lexer rules                                     */
+/*===-------------------------------------------===*/
+
+// fragments
+fragment DecDigit: [0-9];
+fragment OctDigit: [0-7];
+fragment HexDigit: [0-9a-fA-F];
+fragment OctPrefix: '0';
+fragment HexPrefix: '0' [xX];
+fragment NonZeroDecDigit: [1-9];
+fragment ESC: '\\"' | '\\\\';
+
+// keywords
+INT: 'int';
+FLOAT: 'float';
+CONST: 'const';
+// operators
+ADD: '+';
+
+// punctuations
+
+// identifier
+IDENT: IDENTNONDIGIT (IDENTNONDIGIT | DecDigit)*;
+IDENTNONDIGIT: [a-zA-Z_];
+
+// literals
+ILITERAL: INTCONST | FLOATCONST;
+// string
+STRING: '"' (ESC | .)*? '"';
+
+// white space and comments
+WS: [ \t\r\n] -> skip;
+LINECOMMENT: '//' .*? '\r'? '\n' -> skip;
+BLOCKCOMMENT: '/*' .*? '*/' -> skip;
+
+
+
+INTCONST: NonZeroDecDigit DecDigit*
+	| OctPrefix OctDigit*
+	| HexPrefix HexDigit+;
+
+DIGITSEQUENCE: DecDigit+;
+
+// Floating point constants
+FLOATCONST:  DecimalFloatingConstant
+		| HexadecimalFloatingConstant;
+DecimalFloatingConstant: FractionalConstant ExponentPart?  // 允许无指数
+    | DIGITSEQUENCE ExponentPart;        // 保留原有形式
+
+HexadecimalFloatingConstant: HexPrefix HexadecimalFractionalConstant BinaryExponentPart
+		| HexPrefix HexadecimalDigitSequence BinaryExponentPart;
+FractionalConstant: DIGITSEQUENCE? '.' DIGITSEQUENCE
+		| DIGITSEQUENCE '.';
+ExponentPart:
+	[eE] [+-]? DIGITSEQUENCE;
+HexadecimalFractionalConstant: HexadecimalDigitSequence? '.' HexadecimalDigitSequence
+		| HexadecimalDigitSequence '.';
+HexadecimalDigitSequence: HexDigit+;
+BinaryExponentPart:
+	[pP] [+-]? DIGITSEQUENCE;
+
+/*===-------------------------------------------===*/
+/* Syntax rules                                    */
+/*===-------------------------------------------===*/
+// module: funcRParams;
+// compUnit: (dcl | funcDef)+;
+module: (dcl | funcDef)+ | funcRParams;
+
+funcRParams: funcRParam (',' funcRParam)*;
+
+funcRParam: number # expAsRParam | string # stringAsRParam | exp (',' exp)* # expsAsRParam;
+// funcRParam: exp (',' exp)*;
+
+number: ILITERAL;
+
+string: STRING;
+
+bType: INT | FLOAT;
+dcl: constDecl | varDecl;
+constDecl: CONST bType constDef (',' constDef)* ';';
+constDef: IDENT ( '[' constExp ']' )* '=' constInitVal;
+constInitVal: constExp
+	| '{' (constInitVal (',' constInitVal)*)? '}';
+varDecl: bType varDef (',' varDef)* ';';
+varDef: IDENT ( '[' constExp ']' )* initVal?
+	| IDENT ( '[' constExp ']' )* '=' initVal;
+initVal: exp | '{' ( initVal ( ',' initVal )* )? '}';
+
+funcDef: funcType IDENT '(' funcFParams? ')' block;
+funcType: bType | 'void';
+funcFParams: funcFParam (',' funcFParam )*;
+funcFParam: bType IDENT ( '[' ']' ( '[' exp ']' )* )?;
+block: '{' blockItem* '}';
+blockItem: dcl | stmt;
+stmt: lVal '=' exp ';'
+	| exp? ';'
+	// | IDENT '(' funcRParams? ')' ';'
+	| block
+	| 'if' '(' cond ')' stmt ('else' stmt)?
+	| 'while' '(' cond ')' stmt
+	| 'break' ';'
+	| 'continue' ';'
+	| 'return' exp? ';';
+
+exp: addExp;
+cond: lorExp;
+lVal: IDENT ( '[' exp ']' )*;
+primaryExp: '(' exp ')' | lVal | number;
+// number: INTCONST | FLOATCONST;
+unaryExp: primaryExp | IDENT '(' funcRParams? ')'
+	| unaryOp unaryExp;
+unaryOp: '+' | '-' | '!';
+mulExp: unaryExp (('*' | '/' | '%') unaryExp)*;
+addExp: mulExp | addExp ('+' | '-') mulExp;
+relExp: addExp | relExp ('<' | '>' | '<=' | '>=') addExp;
+eqExp: relExp | eqExp ('==' | '!=') relExp;
+landExp: eqExp | landExp '&&' eqExp;
+lorExp: landExp | lorExp '||' landExp;
+constExp: addExp;