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main.h
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main.h
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#define MAX_SRC_LEN 0x10000
namespace LexDefine {
std::vector<std::string> TokenTypeName { // NOLINT(cert-err58-cpp)
"Null",
"IDENFR", "INTCON", "STRCON", "MAINTK", "CONSTTK",
"INTTK", "BREAKTK", "CONTINUETK", "IFTK", "ELSETK",
"NOT", "AND", "OR", "WHILETK", "GETINTTK",
"PRINTFTK", "RETURNTK", "PLUS", "MINU", "VOIDTK",
"MULT", "DIV", "MOD", "LSS", "LEQ",
"GRE", "GEQ", "EQL", "NEQ", "ASSIGN",
"SEMICN", "COMMA", "LPARENT", "RPARENT", "LBRACK",
"RBRACK", "LBRACE", "RBRACE"
};
enum TokenType {
NULLTK,
IDENFR, INTCON, STRCON, MAINTK, CONSTTK,
INTTK, BREAKTK, CONTINUETK, IFTK, ELSETK,
NOT, AND, OR, WHILETK, GETINTTK,
PRINTFTK, RETURNTK, PLUS, MINU, VOIDTK,
MULT, DIV, MOD, LSS, LEQ,
GRE, GEQ, EQL, NEQ, ASSIGN,
SEMICN, COMMA, LPARENT, RPARENT, LBRACK,
RBRACK, LBRACE, RBRACE
};
using Token = std::tuple<int, TokenType, std::string>;
// Line Type Content
}
namespace GraDefine {
using namespace LexDefine;
enum GrammarType {
CompUnit, Decl, ConstDecl, BType, ConstDef,
ConstInitVal, VarDecl, VarDef, InitVal, FuncDef,
MainFuncDef, FuncType, FuncFParams, FuncFParam, Block,
BlockItem, Stmt, Exp, Cond, LVal,
PrimaryExp, Number, UnaryExp, UnaryOp, FuncRParams,
MulExp, AddExp, RelExp, EqExp, LAndExp,
LOrExp, ConstExp, Lexeme, General
};
struct GrammarElement {
std::string _name;
GrammarType _type = General;
std::vector<GrammarElement *> sub;
GrammarElement() = default;
~GrammarElement() = default;
};
struct GCompUnit : GrammarElement {
GCompUnit () : GrammarElement() { _name = "CompUnit"; _type = CompUnit; }
};
struct GDecl : GrammarElement {
GDecl () : GrammarElement() { _name = "Decl"; _type = Decl; }
};
struct GConstDecl : GrammarElement {
GConstDecl () : GrammarElement() { _name = "ConstDecl"; _type = ConstDecl; }
};
struct GBType : GrammarElement {
GBType () : GrammarElement() { _name = "BType"; _type = BType; }
};
struct GConstDef : GrammarElement {
GConstDef () : GrammarElement() { _name = "ConstDef"; _type = ConstDef; }
};
struct GConstInitVal : GrammarElement {
GConstInitVal () : GrammarElement() { _name = "ConstInitVal"; _type = ConstInitVal; }
};
struct GVarDecl : GrammarElement {
GVarDecl () : GrammarElement() { _name = "VarDecl"; _type = VarDecl; }
};
struct GVarDef : GrammarElement {
GVarDef () : GrammarElement() { _name = "VarDef"; _type = VarDef; }
};
struct GInitVal : GrammarElement {
GInitVal () : GrammarElement() { _name = "InitVal"; _type = InitVal; }
};
struct GFuncDef : GrammarElement {
GFuncDef () : GrammarElement() { _name = "FuncDef"; _type = FuncDef; }
};
struct GMainFuncDef : GrammarElement {
GMainFuncDef () : GrammarElement() { _name = "MainFuncDef"; _type = MainFuncDef; }
};
struct GFuncType : GrammarElement {
GFuncType () : GrammarElement() { _name = "FuncType"; _type = FuncType; }
};
struct GFuncFParams : GrammarElement {
GFuncFParams () : GrammarElement() { _name = "FuncFParams"; _type = FuncFParams; }
};
struct GFuncFParam : GrammarElement {
GFuncFParam () : GrammarElement() { _name = "FuncFParam"; _type = FuncFParam; }
};
struct GBlock : GrammarElement {
GBlock () : GrammarElement() { _name = "Block"; _type = Block; }
};
struct GBlockItem : GrammarElement {
GBlockItem () : GrammarElement() { _name = "BlockItem"; _type = BlockItem; }
};
struct GStmt : GrammarElement {
GStmt () : GrammarElement() { _name = "Stmt"; _type = Stmt; }
};
struct GExp : GrammarElement {
GExp () : GrammarElement() { _name = "Exp"; _type = Exp; }
};
struct GCond : GrammarElement {
GCond () : GrammarElement() { _name = "Cond"; _type = Cond; }
};
struct GLVal : GrammarElement {
GLVal () : GrammarElement() { _name = "LVal"; _type = LVal; }
};
struct GPrimaryExp : GrammarElement {
GPrimaryExp () : GrammarElement() { _name = "PrimaryExp"; _type = PrimaryExp; }
};
struct GNumber : GrammarElement {
GNumber () : GrammarElement() { _name = "Number"; _type = Number; }
};
struct GUnaryExp : GrammarElement {
GUnaryExp () : GrammarElement() { _name = "UnaryExp"; _type = UnaryExp; }
};
struct GUnaryOp : GrammarElement {
GUnaryOp () : GrammarElement() { _name = "UnaryOp"; _type = UnaryOp; }
};
struct GFuncRParams : GrammarElement {
GFuncRParams () : GrammarElement() { _name = "FuncRParams"; _type = FuncRParams; }
};
struct GMulExp : GrammarElement {
GMulExp () : GrammarElement() { _name = "MulExp"; _type = MulExp; }
};
struct GAddExp : GrammarElement {
GAddExp () : GrammarElement() { _name = "AddExp"; _type = AddExp; }
};
struct GRelExp : GrammarElement {
GRelExp () : GrammarElement() { _name = "RelExp"; _type = RelExp; }
};
struct GEqExp : GrammarElement {
GEqExp () : GrammarElement() { _name = "EqExp"; _type = EqExp; }
};
struct GLAndExp : GrammarElement {
GLAndExp () : GrammarElement() { _name = "LAndExp"; _type = LAndExp; }
};
struct GLOrExp : GrammarElement {
GLOrExp () : GrammarElement() { _name = "LOrExp"; _type = LOrExp; }
};
struct GConstExp : GrammarElement {
GConstExp () : GrammarElement() { _name = "ConstExp"; _type = ConstExp; }
};
struct GLexeme : GrammarElement {
GLexeme () : GrammarElement() { _name = "Lexeme"; _type = Lexeme; }
Token t;
explicit GLexeme (const Token &tok) : GrammarElement() { _name = "Lexeme"; _type = Lexeme; t = tok; }
};
}
namespace ErrDefine {
using namespace std;
map<char, string> errorMessage { // NOLINT(cert-err58-cpp)
{'A', "invalid character in format string"},
{'B', "redefinition of variable"},
{'C', "use of undeclared identifier"},
{'D', "function parameter number mismatch"},
{'E', "function parameter type mismatch"},
{'F', "void function should not return a value"},
{'G', "non-void function should return a value"},
{'H', "cannot assign to variable with const-qualified type"},
{'I', "expected ;"},
{'J', "expected )"},
{'K', "expected ]"},
{'L', "printf argument number mismatch"},
{'M', "break/continue not in loop statement"},
};
vector< pair<int, char> > errors;
int G_LastConsumedLineNo = -1;
auto report = [] (int a, char b) { errors.emplace_back(a, b); };
void panic(const string& s) {
cerr << s << endl;
exit(-2333);
}
}
namespace SymDefine {
using namespace std;
enum Type {
Void, Any, Int, IntArray, IntArrayArray // TODO: consider any type in handling
};
enum CV {
Normal, Const //, Volatile, Restrict
};
struct Function {
Type ret;
string name;
vector<Type> pars;
bool operator < (const Function &o) const { // TODO: specify overloading
if (name == o.name) {
if (pars.size() != o.pars.size()) return pars.size() < o.pars.size();
else {
for (size_t i = 0; i < pars.size(); ++i) if (pars[i] != o.pars[i]) return pars[i] < o.pars[i];
return false;
}
} else return name < o.name;
}
};
struct Variable {
Type type;
CV cv;
string name;
// int dim1, dim2; not now = =
bool operator < (const Variable &o) const { return name < o.name; }
};
struct Context {
using ContextType = unsigned;
ContextType _ = 0;
static const ContextType inLoop = 0x0001;
static const ContextType inIntFunc = 0x0002;
static const ContextType inVoidFunc = 0x0004;
bool has(ContextType q) const { return (_ & q); }
Context operator | (ContextType t) {
Context c = *this;
c._ |= t;
return c;
}
};
}
namespace Lex {
using namespace std;
using namespace LexDefine;
char Src[MAX_SRC_LEN];
vector<Token> tokens;
int main(FILE *fIn) {
int len = (int) fread(Src, 1, MAX_SRC_LEN, fIn);
int line = 1;
auto addToken = [&] (TokenType t, const string &s) { tokens.emplace_back(line, t, s); };
for (char *p = Src; p < Src + len; ++p) {
if (*p == '{') addToken(LBRACE, "{");
else if (*p == '}') addToken(RBRACE, "}");
else if (*p == '[') addToken(LBRACK, "[");
else if (*p == ']') addToken(RBRACK, "]");
else if (*p == '(') addToken(LPARENT, "(");
else if (*p == ')') addToken(RPARENT, ")");
else if (*p == ',') addToken(COMMA, ",");
else if (*p == ';') addToken(SEMICN, ";");
else if (*p == '%') addToken(MOD, "%");
else if (*p == '*') addToken(MULT, "*");
else if (*p == '+') addToken(PLUS, "+");
else if (*p == '-') addToken(MINU, "-");
else if (*p == '<') {
if (p[1] == '=') addToken(LEQ, "<="), ++p;
else addToken(LSS, "<");
} else if (*p == '>') {
if (p[1] == '=') addToken(GEQ, ">="), ++p;
else addToken(GRE, ">");
} else if (*p == '=') {
if (p[1] == '=') addToken(EQL, "=="), ++p;
else addToken(ASSIGN, "=");
} else if (*p == '!') {
if (p[1] == '=') addToken(NEQ, "!="), ++p;
else addToken(NOT, "!");
} else if (*p == '&') {
if (p[1] == '&') addToken(AND, "&&"), ++p;
else ErrDefine::panic("[L] no bitwise and support");
} else if (*p == '|') {
if (p[1] == '|') addToken(OR, "||"), ++p;
else ErrDefine::panic("[L] no bitwise or support");
} else if (*p == '/') {
if (p[1] == '/') {
while (p + 1 < Src + len && p[1] != '\n') ++p;
}
else if (p[1] == '*') {
p += 2;
while (p + 1 < Src + len && (p[0] != '*' || p[1] != '/')) ++p;
if (p[0] != '*' || p[1] != '/') ErrDefine::panic("[L] block comment not ended");
else ++p;
}
else addToken(DIV, "/");
} else if (*p == '\"') {
int t = 1;
for (; p + t <= Src + len; ++t) {
if (p[t] == 32 || p[t] == 33 || (40 <= p[t] && p[t] < 92) || (92 < p[t] && p[t] <= 126)) continue;
else if ((35 <= p[t] && p[t] <= 39) || p[t] == 92) { { } continue; }
else break;
// disable L stage check for now
// else if (p[t] == 92) {
// if (p[t + 1] == 'n') ++t;
// else break;
// } else if (p[t] == '%') {
// if (p[t + 1] == 'd') ++t;
// else break;
// } else break;
}
if (p[t] == '\"') addToken(STRCON, string(p, t + 1)), p += t;
else ErrDefine::panic("[L] string literal not ended");
} else if (isdigit(*p)) {
int t = 1;
for (; p + t <= Src + len; ++t) {
if (!isdigit(p[t])) break;
}
if (*p != '0' || t == 1) addToken(INTCON, string(p, p + t)), p += (t - 1);
else ErrDefine::panic("[L] no octal integer literal support");
} else if (isalpha(*p) || *p == '_') {
int t = 1;
for (; p + t < Src + len; ++t) {
if (isalpha(p[t]) || p[t] == '_' || isdigit(p[t])) continue;
else break;
}
string s(p, t);
if (s == "main") addToken(MAINTK, s);
else if (s == "const") addToken(CONSTTK, s);
else if (s == "int") addToken(INTTK, s);
else if (s == "break") addToken(BREAKTK, s);
else if (s == "continue") addToken(CONTINUETK, s);
else if (s == "if") addToken(IFTK, s);
else if (s == "else") addToken(ELSETK, s);
else if (s == "while") addToken(WHILETK, s);
else if (s == "getint") addToken(GETINTTK, s);
else if (s == "printf") addToken(PRINTFTK, s);
else if (s == "return") addToken(RETURNTK, s);
else if (s == "void") addToken(VOIDTK, s);
else addToken(IDENFR, s);
p += (t - 1);
} else if (isspace(*p)) {
if (*p == '\n') ++line;
}
else ErrDefine::panic((string) "[L] stray char "
+ "0123456789abcdef"[(*p >> 4) & 15]
+ "0123456789abcdef"[*p & 15] + " in program");
}
return (int) tokens.size();
}
}
namespace Gra {
using namespace GraDefine;
using namespace std;
pair<bool, GCompUnit*> ParseCompUnit();
pair<bool, GDecl*> ParseDecl();
pair<bool, GConstDecl*> ParseConstDecl();
pair<bool, GBType*> ParseBType();
pair<bool, GConstDef*> ParseConstDef();
pair<bool, GConstInitVal*> ParseConstInitVal();
pair<bool, GVarDecl*> ParseVarDecl();
pair<bool, GVarDef*> ParseVarDef();
pair<bool, GInitVal*> ParseInitVal();
pair<bool, GFuncDef*> ParseFuncDef();
pair<bool, GMainFuncDef*> ParseMainFuncDef();
pair<bool, GFuncType*> ParseFuncType();
pair<bool, GFuncFParams*> ParseFuncFParams();
pair<bool, GFuncFParam*> ParseFuncFParam();
pair<bool, GBlock*> ParseBlock();
pair<bool, GBlockItem*> ParseBlockItem();
pair<bool, GStmt*> ParseStmt();
pair<bool, GExp*> ParseExp();
pair<bool, GCond*> ParseCond();
pair<bool, GLVal*> ParseLVal();
pair<bool, GPrimaryExp*> ParsePrimaryExp();
pair<bool, GNumber*> ParseNumber();
pair<bool, GUnaryExp*> ParseUnaryExp();
pair<bool, GUnaryOp*> ParseUnaryOp();
pair<bool, GFuncRParams*> ParseFuncRParams();
pair<bool, GMulExp*> ParseMulExp();
pair<bool, GAddExp*> ParseAddExp();
pair<bool, GRelExp*> ParseRelExp();
pair<bool, GEqExp*> ParseEqExp();
pair<bool, GLAndExp*> ParseLAndExp();
pair<bool, GLOrExp*> ParseLOrExp();
pair<bool, GConstExp*> ParseConstExp();
deque<Token> tokens; // NOLINT(cert-err58-cpp)
GCompUnit *AST;
inline TokenType fetchType(int i = 0) { return 0 <= i && i < (int) tokens.size() ? get<1>(tokens[i]) : NULLTK; }
int main(vector<Token> v) {
tokens = deque<Token>(v.begin(), v.end());
const auto &res = ParseCompUnit();
if (res.first) AST = res.second;
else return -233333;
return 0;
}
bool lAccept(GrammarElement *ret, const function<pair<bool, GrammarElement*>()> &Parser) {
bool s;
GrammarElement *g;
tie(s, g) = Parser();
if (s) ret->sub.emplace_back(g);
return s;
}
bool lConsume(GrammarElement *ret, TokenType expected) {
if (!tokens.empty() && get<1>(tokens.front()) == expected) {
ret->sub.emplace_back(new GLexeme(tokens.front()));
ErrDefine::G_LastConsumedLineNo = get<0>(tokens.front());
tokens.pop_front();
return true;
} else {
// due to lCon || lCon, this panic cannot be effective
// ErrDefine::panic("expected token " + TokenTypeName[expected]);
return false;
}
}
bool lConsumeOrReport(GrammarElement *ret, int expected, char err) {
if (!tokens.empty() && get<1>(tokens.front()) == expected) {
ret->sub.emplace_back(new GLexeme(tokens.front()));
tokens.pop_front();
return true;
} else {
ErrDefine::report(ErrDefine::G_LastConsumedLineNo, err);
return false;
}
}
bool inline isKwToken(int t) {
return t == CONSTTK || t == INTTK || t == BREAKTK || t == RETURNTK || t == VOIDTK
|| t == CONTINUETK || t == IFTK || t == ELSETK || t == WHILETK || t == MAINTK;
}
bool inline isBrace(int t) {
return t == LBRACE || t == RBRACE;
}
bool inline isFiExp(int t) {
return t == IDENFR || t == NOT || t == PLUS || t == MINU || t == LPARENT || t == INTCON;
}
bool inline isBType(int t) { return t == INTTK; }
pair<bool, GCompUnit*> ParseCompUnit() {
auto *ret = new GCompUnit();
// TODO: detect funcdef before decl
while (fetchType() != NULLTK) {
bool s = false;
switch (fetchType()) {
case CONSTTK:
s = lAccept(ret, ParseDecl);
break;
case INTTK:
if (fetchType(1) == MAINTK) s = lAccept(ret, ParseMainFuncDef);
else if (fetchType(1) == IDENFR) {
if (fetchType(2) == LPARENT) s = lAccept(ret, ParseFuncDef);
else s = lAccept(ret, ParseDecl);
}
break;
case VOIDTK:
s = lAccept(ret, ParseFuncDef);
break;
default: break;
}
if (!s) break;
}
return make_pair(true, ret);
}
pair<bool, GDecl*> ParseDecl() {
auto *ret = new GDecl();
switch (fetchType()) {
case CONSTTK:
lAccept(ret, ParseConstDecl);
break;
case INTTK:
lAccept(ret, ParseVarDecl);
break;
default:
break;
}
return make_pair(true, ret);
}
pair<bool, GConstDecl*> ParseConstDecl() {
auto *ret = new GConstDecl();
lConsume(ret, CONSTTK);
lAccept(ret, ParseBType);
lAccept(ret, ParseConstDef);
while (fetchType() == COMMA) {
lConsume(ret, COMMA);
lAccept(ret, ParseConstDef);
}
lConsumeOrReport(ret, SEMICN, 'I');
return make_pair(true, ret);
}
pair<bool, GBType*> ParseBType() {
auto *ret = new GBType();
lConsume(ret, INTTK);
return make_pair(true, ret);
}
pair<bool, GConstDef*> ParseConstDef() {
auto *ret = new GConstDef();
lConsume(ret, IDENFR);
while (fetchType() == LBRACK) {
lConsume(ret, LBRACK);
lAccept(ret, ParseConstExp);
lConsumeOrReport(ret, RBRACK, 'K');
}
lConsume(ret, ASSIGN);
lAccept(ret, ParseConstInitVal);
return make_pair(true, ret);
}
pair<bool, GConstInitVal*> ParseConstInitVal() {
auto *ret = new GConstInitVal();
if (fetchType() == LBRACE) {
lConsume(ret, LBRACE);
if (fetchType() != RBRACE) {
lAccept(ret, ParseConstInitVal);
while (fetchType() == COMMA) {
lConsume(ret, COMMA);
lAccept(ret, ParseConstInitVal);
}
}
lConsume(ret, RBRACE);
} else {
lAccept(ret, ParseConstExp);
}
return make_pair(true, ret);
}
pair<bool, GVarDecl*> ParseVarDecl() {
auto *ret = new GVarDecl();
lAccept(ret, ParseBType);
lAccept(ret, ParseVarDef);
while (fetchType() == COMMA) {
lConsume(ret, COMMA);
lAccept(ret, ParseVarDef);
}
lConsumeOrReport(ret, SEMICN, 'I');
return make_pair(true, ret);
}
pair<bool, GVarDef*> ParseVarDef() {
auto *ret = new GVarDef();
lConsume(ret, IDENFR);
while (fetchType() == LBRACK) {
lConsume(ret, LBRACK);
lAccept(ret, ParseConstExp);
lConsumeOrReport(ret, RBRACK, 'K');
}
if (fetchType() == ASSIGN) {
lConsume(ret, ASSIGN);
lAccept(ret, ParseInitVal);
}
return make_pair(true, ret);
}
pair<bool, GInitVal*> ParseInitVal() {
auto *ret = new GInitVal();
if (fetchType() == LBRACE) {
lConsume(ret, LBRACE);
if (fetchType() != RBRACE) {
lAccept(ret, ParseInitVal);
while (fetchType() == COMMA) {
lConsume(ret, COMMA);
lAccept(ret, ParseInitVal);
}
}
lConsume(ret, RBRACE);
} else {
lAccept(ret, ParseExp);
}
return make_pair(true, ret);
}
pair<bool, GFuncDef*> ParseFuncDef() {
auto *ret = new GFuncDef();
lAccept(ret, ParseFuncType);
lConsume(ret, IDENFR);
lConsume(ret, LPARENT);
if (isBType(fetchType())) lAccept(ret, ParseFuncFParams);
lConsumeOrReport(ret, RPARENT, 'J');
lAccept(ret, ParseBlock);
return make_pair(true, ret);
}
pair<bool, GMainFuncDef*> ParseMainFuncDef() {
auto *ret = new GMainFuncDef();
lConsume(ret, INTTK);
lConsume(ret, MAINTK);
lConsume(ret, LPARENT);
lConsumeOrReport(ret, RPARENT, 'J');
lAccept(ret, ParseBlock);
return make_pair(true, ret);
}
pair<bool, GFuncType*> ParseFuncType() {
auto *ret = new GFuncType();
if (fetchType() == VOIDTK) lConsume(ret, VOIDTK);
else lConsume(ret, INTTK);
return make_pair(true, ret);
}
pair<bool, GFuncFParams*> ParseFuncFParams() {
auto *ret = new GFuncFParams();
lAccept(ret, ParseFuncFParam);
while (fetchType() == COMMA) {
lConsume(ret, COMMA);
lAccept(ret, ParseFuncFParam);
}
return make_pair(true, ret);
}
pair<bool, GFuncFParam*> ParseFuncFParam() {
auto *ret = new GFuncFParam();
lAccept(ret, ParseBType);
lConsume(ret, IDENFR);
if (fetchType() == LBRACK) {
lConsume(ret, LBRACK);
lConsumeOrReport(ret, RBRACK, 'K');
while (fetchType() == LBRACK) {
lConsume(ret, LBRACK);
lAccept(ret, ParseConstExp);
lConsumeOrReport(ret, RBRACK, 'K');
}
}
return make_pair(true, ret);
}
pair<bool, GBlock*> ParseBlock() {
auto *ret = new GBlock();
lConsume(ret, LBRACE);
while (fetchType() != RBRACE) {
lAccept(ret, ParseBlockItem);
}
lConsume(ret, RBRACE);
return make_pair(true, ret);
}
pair<bool, GBlockItem*> ParseBlockItem() {
auto *ret = new GBlockItem();
switch (fetchType()) {
case CONSTTK:
case INTTK:
lAccept(ret, ParseDecl);
break;
default:
lAccept(ret, ParseStmt);
break;
}
return make_pair(true, ret);
}
pair<bool, GStmt*> ParseStmt() {
auto *ret = new GStmt();
switch (fetchType()) {
case LBRACE:
lAccept(ret, ParseBlock);
break;
case IFTK:
lConsume(ret, IFTK);
lConsume(ret, LPARENT);
lAccept(ret, ParseCond);
lConsumeOrReport(ret, RPARENT, 'J');
lAccept(ret, ParseStmt);
if (fetchType() == ELSETK) {
lConsume(ret, ELSETK);
lAccept(ret, ParseStmt);
}
break;
case WHILETK:
lConsume(ret, WHILETK);
lConsume(ret, LPARENT);
lAccept(ret, ParseCond);
lConsumeOrReport(ret, RPARENT, 'J');
lAccept(ret, ParseStmt);
break;
case BREAKTK:
lConsume(ret, BREAKTK);
lConsumeOrReport(ret, SEMICN, 'I');
break;
case CONTINUETK:
lConsume(ret, CONTINUETK);
lConsumeOrReport(ret, SEMICN, 'I');
break;
case RETURNTK:
lConsume(ret, RETURNTK);
if (isFiExp(fetchType())) lAccept(ret, ParseExp);
lConsumeOrReport(ret, SEMICN, 'I');
break;
case PRINTFTK:
lConsume(ret, PRINTFTK);
lConsume(ret, LPARENT);
lConsume(ret, STRCON);
while (fetchType() == COMMA) {
lConsume(ret, COMMA);
lAccept(ret, ParseExp);
}
lConsumeOrReport(ret, RPARENT, 'J');
lConsumeOrReport(ret, SEMICN, 'I');
break;
default:
bool hasAssign = false;
bool isGetint = false;
for (int i = 0, t, bracket = 0; t = fetchType(i), t != NULLTK && !isKwToken(t) && !isBrace(t)
&& t != STRCON && t != PRINTFTK && t != SEMICN; ++i) { // TODO: Ambiguity here
if (t == LBRACK) ++bracket;
else if (t == RBRACK) --bracket;
else if (t == ASSIGN) {
hasAssign = true;
isGetint = fetchType(i + 1) == GETINTTK;
break;
} else if (t == IDENFR && i > 0) { // if cannot be joined into exp, out
TokenType tt = fetchType(i - 1);
if (bracket == 0) break;
if (tt == INTCON || tt == GETINTTK || tt == ASSIGN || tt == RBRACK) break;
}
}
if (!hasAssign) {
if (isFiExp(fetchType())) lAccept(ret, ParseExp);
lConsumeOrReport(ret, SEMICN, 'I');
} else if (isGetint) {
lAccept(ret, ParseLVal);
lConsume(ret, ASSIGN);
lConsume(ret, GETINTTK);
lConsume(ret, LPARENT);
lConsumeOrReport(ret, RPARENT, 'J');
lConsumeOrReport(ret, SEMICN, 'I');
} else {
lAccept(ret, ParseLVal);
lConsume(ret, ASSIGN);
lAccept(ret, ParseExp);
lConsumeOrReport(ret, SEMICN, 'I');
}
break;
}
return make_pair(true, ret);
}
pair<bool, GExp*> ParseExp() {
auto *ret = new GExp();
lAccept(ret, ParseAddExp);
return make_pair(true, ret);
}
pair<bool, GCond*> ParseCond() {
auto *ret = new GCond();
lAccept(ret, ParseLOrExp);
return make_pair(true, ret);
}
pair<bool, GLVal*> ParseLVal() {
auto *ret = new GLVal();
lConsume(ret, IDENFR);
while (fetchType() == LBRACK) {
lConsume(ret, LBRACK);
lAccept(ret, ParseExp);
lConsumeOrReport(ret, RBRACK, 'K');
}
return make_pair(true, ret);
}
pair<bool, GPrimaryExp*> ParsePrimaryExp() {
auto *ret = new GPrimaryExp();
switch (fetchType()) {
case LPARENT:
lConsume(ret, LPARENT);
lAccept(ret, ParseExp);
lConsumeOrReport(ret, RPARENT, 'J'); // class J should not be handled though
break;
case IDENFR:
lAccept(ret, ParseLVal);
break;
case INTCON:
lAccept(ret, ParseNumber);
break;
default: break;
}
return make_pair(true, ret);
}
pair<bool, GNumber*> ParseNumber() {
auto *ret = new GNumber();
lConsume(ret, INTCON);
return make_pair(true, ret);
}
pair<bool, GUnaryExp*> ParseUnaryExp() {
auto *ret = new GUnaryExp();
switch (fetchType()) {
case PLUS:
case MINU:
case NOT:
lAccept(ret, ParseUnaryOp);
lAccept(ret, ParseUnaryExp);
break;
case LPARENT:
case INTCON:
lAccept(ret, ParsePrimaryExp);
break;
case IDENFR:
if (fetchType(1) == LPARENT) {
lConsume(ret, IDENFR);
lConsume(ret, LPARENT);
int t = fetchType();
if (isFiExp(t)) lAccept(ret, ParseFuncRParams); // because FRP can only start with Exp
lConsumeOrReport(ret, RPARENT, 'J');
} else {
lAccept(ret, ParsePrimaryExp);
}
break;
default: break;
}
return make_pair(true, ret);
}
pair<bool, GUnaryOp*> ParseUnaryOp() {
auto *ret = new GUnaryOp();
lConsume(ret, PLUS) || lConsume(ret, MINU) || lConsume(ret, NOT);
return make_pair(true, ret);
}
pair<bool, GFuncRParams*> ParseFuncRParams() {
auto *ret = new GFuncRParams();
lAccept(ret, ParseExp);
while (fetchType() == COMMA) {
lConsume(ret, COMMA);
lAccept(ret, ParseExp);
}
return make_pair(true, ret);
}
pair<bool, GMulExp*> ParseMulExp() {
auto *ret = new GMulExp();
lAccept(ret, ParseUnaryExp);
bool enough = false;
while (!enough) {
switch (fetchType()) {
case MULT:
case DIV:
case MOD:
lConsume(ret, MULT) || lConsume(ret, DIV) || lConsume(ret, MOD);
lAccept(ret, ParseUnaryExp);
break;
default:
enough = true;
break;
}
}
return make_pair(true, ret);
}
pair<bool, GAddExp*> ParseAddExp() {
auto *ret = new GAddExp();
lAccept(ret, ParseMulExp);
bool enough = false;
while (!enough) {
switch (fetchType()) {
case PLUS:
case MINU:
lConsume(ret, PLUS) || lConsume(ret, MINU);
lAccept(ret, ParseMulExp);
break;
default:
enough = true;
break;
}
}
return make_pair(true, ret);
}
pair<bool, GRelExp*> ParseRelExp() {
auto *ret = new GRelExp();
lAccept(ret, ParseAddExp);
bool enough = false;
while (!enough) {
switch (fetchType()) {
case LSS:
case LEQ:
case GRE:
case GEQ:
lConsume(ret, LSS) || lConsume(ret, LEQ) || lConsume(ret, GRE) || lConsume(ret, GEQ);
lAccept(ret, ParseAddExp);
break;
default:
enough = true;
break;
}
}
return make_pair(true, ret);
}
pair<bool, GEqExp*> ParseEqExp() {
auto *ret = new GEqExp();
lAccept(ret, ParseRelExp);
bool enough = false;
while (!enough) {
switch (fetchType()) {
case EQL:
case NEQ:
lConsume(ret, EQL) || lConsume(ret, NEQ);
lAccept(ret, ParseRelExp);
break;
default:
enough = true;
break;
}
}
return make_pair(true, ret);
}
pair<bool, GLAndExp*> ParseLAndExp() {
auto *ret = new GLAndExp();
lAccept(ret, ParseEqExp);
while (fetchType() == AND) {
lConsume(ret, AND);
lAccept(ret, ParseEqExp);
}
return make_pair(true, ret);
}
pair<bool, GLOrExp*> ParseLOrExp() {
auto *ret = new GLOrExp();
lAccept(ret, ParseLAndExp);
while (fetchType() == OR) {
lConsume(ret, OR);
lAccept(ret, ParseLAndExp);
}
return make_pair(true, ret);
}
pair<bool, GConstExp*> ParseConstExp() {
auto *ret = new GConstExp();
lAccept(ret, ParseAddExp);
return make_pair(true, ret);
}
}
namespace Err {
using namespace ErrDefine;
using namespace GraDefine;
using namespace SymDefine;
using namespace std;
set<Function> FuncTab;
map< string, vector<Function> > FuncMap;
map< string, stack<Variable> > VarTab;
set<Variable> GlobalVar;
void addFunc(const Function &f, int line) {
if (FuncTab.find(f) != FuncTab.end()) return report(line, 'B');
else {
FuncTab.insert(f);
FuncMap[f.name].push_back(f);
}
}
void addVar(set<Variable> &loc, const Variable &f, int line) {
if (loc.find(f) != loc.end()) return report(line, 'B');
else {
loc.insert(f);
VarTab[f.name].push(f);
}
}
Variable lookupVar(const string &s) {
const auto &it = VarTab.find(s);
return it != VarTab.end() && !it->second.empty()
? it->second.top() : ((Variable) {Void, Normal, ""});
}
void clearBlock(set<Variable> &v) {
for (const auto &u : v) VarTab[u.name].pop();
}
void checkMandatoryReturn(GrammarElement *gb) {
// check mandatory return (class G)
int ln = get<0>(((GLexeme *) gb->sub.back())->t);
if (gb->sub.size() == 2) report(ln, 'G');
else {
GrammarElement *gs = gb->sub[gb->sub.size() - 2]->sub[0];
if (gs->_type != Stmt ||
gs->sub[0]->_type != Lexeme ||
get<1>(((GLexeme *) gs->sub[0])->t) != RETURNTK) report(ln, 'G');
}
}
bool matchFunctionCall(const Function &f, const vector<Type> &pars) {
for (size_t i = 0; i < f.pars.size(); ++i) if (f.pars[i] != pars[i]) return false;
return true;
}
Type traverse(GrammarElement *ge, set<Variable> &loc = GlobalVar, Context con = {}) {
set<Variable> newLoc;
switch (ge->_type) {
case CompUnit:
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case Decl:
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case ConstDecl:
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case BType:
return Int;
case ConstDef:
{
const Token &t = ((GLexeme *) ge->sub[0])->t;
auto dimCount = count_if(ge->sub.begin(), ge->sub.end(), [] (GrammarElement *p) { return p->_type == ConstExp; });
addVar(loc, {(Type) (Int + dimCount), Const, get<2>(t)}, get<0>(t));
}
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case ConstInitVal:
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case VarDecl:
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case VarDef:
{
const Token &t = ((GLexeme *) ge->sub[0])->t;
auto dimCount = count_if(ge->sub.begin(), ge->sub.end(), [] (GrammarElement *p) { return p->_type == ConstExp; });
addVar(loc, {(Type) (Int + dimCount), Normal, get<2>(t)}, get<0>(t));
}
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case InitVal:
for (const auto &g : ge->sub) traverse(g, loc, con);
break;
case FuncDef: {
const Token &t1 = ((GLexeme *) ge->sub[1])->t;
Type ret = traverse(ge->sub[0]); // no duplicate scan issue
Function f {ret, get<2>(t1)};
for (const auto &g : ge->sub) {
if (g->_type == FuncFParams) {
for (const auto &gg : g->sub) {
if (gg->_type == FuncFParam) {
auto pred = [] (GrammarElement *p) { return p->_type == Lexeme && get<1>(((GLexeme *) p)->t) == LBRACK; };
auto dimCount = count_if(gg->sub.begin(), gg->sub.end(), pred);
f.pars.push_back((Type) (Int + dimCount));
}
}
}
}
addFunc(f, get<0>(t1));
for (const auto &g : ge->sub) {
if (g->_type != Block) {
traverse(g, newLoc, con | (ret == Void ? Context::inVoidFunc : Context::inIntFunc));
} else {
for (const auto &gg : g->sub) { // = = same scope as the pars
traverse(gg, newLoc, con | (ret == Void ? Context::inVoidFunc : Context::inIntFunc));
}
}
}
clearBlock(newLoc);
if (ret != Void) checkMandatoryReturn(ge->sub.back());
break;
}
case MainFuncDef:
for (const auto &g : ge->sub) traverse(g, newLoc, con | Context::inIntFunc);
clearBlock(newLoc);
checkMandatoryReturn(ge->sub.back());