Adding var declaration and set statement handling

compiler/CodeGenVisitor.cpp

@@ -1,31 +1,46 @@
 #include "CodeGenVisitor.h"
 
+#include "generated/ifccParser.h"
+
+antlrcpp::Any CodeGenVisitor::visitStmt(ifccParser::StmtContext *ctx) {
+    return this->visitChildren(ctx);
+}
+antlrcpp::Any CodeGenVisitor::visitDecl_stmt(ifccParser::Decl_stmtContext *ctx) {
+    return 0;
+}
+antlrcpp::Any CodeGenVisitor::visitSet_stmt(ifccParser::Set_stmtContext *ctx) {
+    return 0;
+}
+antlrcpp::Any CodeGenVisitor::visitVal(ifccParser::ValContext *ctx) {
+    // TODO: return either the const or the variable value from the symbol table
+    return 0;
+}
+
 antlrcpp::Any CodeGenVisitor::visitProg(ifccParser::ProgContext *ctx)
 {
     #ifdef __APPLE__
-    std::cout<< ".globl _main\n" ;
+    std::cout << ".globl _main\n" ;
-    std::cout<< " _main: \n" ;
+    std::cout << " _main: \n" ;
     #else
-    std::cout<< ".globl main\n" ;
+    std::cout << ".globl main\n" ;
-    std::cout<< " main: \n" ;
+    std::cout << " main: \n" ;
     #endif
 
-    this->visit( ctx->return_stmt() );
+    this->visitChildren(ctx);
 
     std::cout << "    ret\n";
-
     return 0;
 }
 
 
 antlrcpp::Any CodeGenVisitor::visitReturn_stmt(ifccParser::Return_stmtContext *ctx)
 {
-    int retval = stoi(ctx->CONST()->getText());
+    int retval = stoi(ctx->val()->getText());
 
     #ifdef __APPLE__
-        std::cout << "    mov w0, #"<<retval<<"\n" ;
+        std::cout << "    mov w0, #" << retval << "\n" ;
     #else
-        std::cout << "    movl $"<<retval<<", %eax\n" ;
+        std::cout << "    movl $" << retval << ", %eax\n" ;
     #endif
 
     return 0;

compiler/CodeGenVisitor.h

@@ -7,7 +7,17 @@
 
 class  CodeGenVisitor : public ifccBaseVisitor {
 	public:
-        virtual antlrcpp::Any visitProg(ifccParser::ProgContext *ctx) override ;
+
-        virtual antlrcpp::Any visitReturn_stmt(ifccParser::Return_stmtContext *ctx) override;
+	std::any visitProg(ifccParser::ProgContext *ctx) override ;
+
+	std::any visitStmt(ifccParser::StmtContext *ctx) override ;
+
+	std::any visitReturn_stmt(ifccParser::Return_stmtContext *ctx) override ;
+
+	std::any visitDecl_stmt(ifccParser::Decl_stmtContext *ctx) override ;
+
+	std::any visitSet_stmt(ifccParser::Set_stmtContext *ctx) override ;
+
+	std::any visitVal(ifccParser::ValContext *ctx) override ;
 };
 

compiler/ifcc.g4

@@ -1,13 +1,22 @@
 grammar ifcc;
 
-axiom : prog EOF ;
+axiom: prog EOF ;
 
-prog : 'int' 'main' '(' ')' '{' return_stmt '}' ;
+prog: 'int' 'main' '(' ')' '{' stmt* '}' ;
 
-return_stmt: RETURN CONST ';' ;
+stmt: decl_stmt | set_stmt | return_stmt ;
+
+return_stmt: RETURN val ';' ;
+
+decl_stmt: 'int' VAR_NAME ';' ;
+set_stmt: VAR_NAME '=' val ';' ;
+
+val: CONST | VAR_NAME ;
 
 RETURN : 'return' ;
 CONST : [0-9]+ ;
+VAR_NAME : [0-9a-zA-Z_]+ ;
+
 COMMENT : '/*' .*? '*/' -> skip ;
 DIRECTIVE : '#' .*? '\n' -> skip ;
-WS    : [ \t\r\n] -> channel(HIDDEN);
+WS    : [ \t\r\n] -> channel(HIDDEN) ;

prog/Makefile

@@ -0,0 +1,11 @@
+gcc: gcca main-gcc.asm
+	gcc -o main-gcc.o main-gcc.asm
+gcca: main.c
+	gcc -S -o main-gcc.asm main.c
+
+ifcc: ifcca main-ifcc.asm
+	gcc -o main-ifcc.o main-ifcc.asm
+ifcca: main.c comp-ifcc
+	../compiler/ifcc main.c > main-ifcc.asm
+comp-ifcc:
+	cd ../compiler && make

prog/main.c

@@ -0,0 +1,5 @@
+int main() {
+    int x;
+    x=42;
+    return x;
+}