Initial commit

compiler/CodeGenVisitor.cpp

@@ -0,0 +1,28 @@
+#include "CodeGenVisitor.h"
+
+antlrcpp::Any CodeGenVisitor::visitProg(ifccParser::ProgContext *ctx) 
+{
+    #ifdef __APPLE__
+    std::cout<< ".globl _main\n" ;
+    std::cout<< " _main: \n" ;
+    #else
+    std::cout<< ".globl main\n" ;
+    std::cout<< " main: \n" ;
+    #endif
+
+    this->visit( ctx->return_stmt() );
+    
+    std::cout << "    ret\n";
+
+    return 0;
+}
+
+
+antlrcpp::Any CodeGenVisitor::visitReturn_stmt(ifccParser::Return_stmtContext *ctx)
+{
+    int retval = stoi(ctx->CONST()->getText());
+
+    std::cout << "    movl $"<<retval<<", %eax\n" ;
+
+    return 0;
+}

compiler/CodeGenVisitor.h

@@ -0,0 +1,13 @@
+#pragma once
+
+
+#include "antlr4-runtime.h"
+#include "generated/ifccBaseVisitor.h"
+
+
+class  CodeGenVisitor : public ifccBaseVisitor {
+	public:
+        virtual antlrcpp::Any visitProg(ifccParser::ProgContext *ctx) override ;
+        virtual antlrcpp::Any visitReturn_stmt(ifccParser::Return_stmtContext *ctx) override;
+};
+

compiler/Makefile

@@ -0,0 +1,71 @@
+# config.mk contains the paths to antlr4 etc.
+# Each student should have a config.mk corresponding to her system.
+# Examples are  ubuntu.mk, DI.mk, fedora.mk
+# Then config.mk should be in the .gitignore of your project
+include config.mk
+
+CC=g++
+CCFLAGS=-g -c -std=c++17 -I$(ANTLRINC) -Wno-attributes # -Wno-defaulted-function-deleted -Wno-unknown-warning-option
+LDFLAGS=-g
+
+default: all
+all: ifcc
+
+##########################################
+# link together all pieces of our compiler 
+OBJECTS=build/ifccBaseVisitor.o \
+	build/ifccLexer.o \
+	build/ifccVisitor.o \
+	build/ifccParser.o \
+	build/main.o \
+	build/CodeGenVisitor.o
+
+ifcc: $(OBJECTS)
+	@mkdir -p build
+	$(CC) $(LDFLAGS) build/*.o $(ANTLRLIB) -o ifcc
+
+##########################################
+# compile our hand-writen C++ code: main(), CodeGenVisitor, etc.
+build/%.o: %.cpp generated/ifccParser.cpp
+	@mkdir -p build
+	$(CC) $(CCFLAGS) -MMD -o $@ $< 
+
+##########################################
+# compile all the antlr-generated C++
+build/%.o: generated/%.cpp
+	@mkdir -p build
+	$(CC) $(CCFLAGS) -MMD -o $@ $< 
+
+# automagic dependency management: `gcc -MMD` generates all the .d files for us
+-include build/*.d
+build/%.d:
+
+##########################################
+# generate the C++ implementation of our Lexer/Parser/Visitor
+generated/ifccLexer.cpp: generated/ifccParser.cpp
+generated/ifccVisitor.cpp: generated/ifccParser.cpp
+generated/ifccBaseVisitor.cpp: generated/ifccParser.cpp
+generated/ifccParser.cpp: ifcc.g4
+	@mkdir -p generated
+	java -jar $(ANTLRJAR) -visitor -no-listener -Dlanguage=Cpp -o generated ifcc.g4
+
+# prevent automatic cleanup of "intermediate" files like ifccLexer.cpp etc
+.PRECIOUS: generated/ifcc%.cpp   
+
+##########################################
+# view the parse tree in a graphical window
+
+# Usage: `make gui FILE=path/to/your/file.c`
+FILE ?= ../tests/testfiles/1_return42.c
+
+gui:
+	@mkdir -p generated build
+	java -jar $(ANTLRJAR) -Dlanguage=Java -o generated ifcc.g4
+	javac -cp $(ANTLRJAR) -d build generated/*.java
+	java -cp $(ANTLRJAR):build org.antlr.v4.gui.TestRig ifcc axiom -gui $(FILE)
+
+##########################################
+# delete all machine-generated files
+clean:
+	rm -rf build generated
+	rm -f ifcc

compiler/config-IF501.mk

@@ -0,0 +1,4 @@
+# these values work with the "install-antlr.sh" script provided for the PLD
+ANTLRJAR=../antlr/jar/antlr-4.9.2-complete.jar
+ANTLRINC=../antlr/include
+ANTLRLIB=../antlr/lib/libantlr4-runtime.a

compiler/config-wsl-2025.mk

@@ -0,0 +1,3 @@
+ANTLRJAR=/home/$(USER)/antlr4-install/antlr-4.13.2-complete.jar
+ANTLRINC=/usr/local/include/antlr4-runtime/
+ANTLRLIB=/usr/local/lib/libantlr4-runtime.a

compiler/config.mk

@@ -0,0 +1,3 @@
+ANTLRJAR=/home/$(USER)/antlr4-install/antlr-4.13.2-complete.jar
+ANTLRINC=/usr/local/include/antlr4-runtime/
+ANTLRLIB=/usr/local/lib/libantlr4-runtime.a

compiler/ifcc.g4

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

compiler/main.cpp

@@ -0,0 +1,56 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <cstdlib>
+
+#include "antlr4-runtime.h"
+#include "generated/ifccLexer.h"
+#include "generated/ifccParser.h"
+#include "generated/ifccBaseVisitor.h"
+
+#include "CodeGenVisitor.h"
+
+using namespace antlr4;
+using namespace std;
+
+int main(int argn, const char **argv)
+{
+  stringstream in;
+  if (argn==2)
+  {
+     ifstream lecture(argv[1]);
+     if( !lecture.good() )
+     {
+         cerr<<"error: cannot read file: " << argv[1] << endl ;
+         exit(1);
+     }
+     in << lecture.rdbuf();
+  }
+  else
+  {
+      cerr << "usage: ifcc path/to/file.c" << endl ;
+      exit(1);
+  }
+  
+  ANTLRInputStream input(in.str());
+
+  ifccLexer lexer(&input);
+  CommonTokenStream tokens(&lexer);
+
+  tokens.fill();
+
+  ifccParser parser(&tokens);
+  tree::ParseTree* tree = parser.axiom();
+
+  if(parser.getNumberOfSyntaxErrors() != 0)
+  {
+      cerr << "error: syntax error during parsing" << endl;
+      exit(1);
+  }
+
+  
+  CodeGenVisitor v;
+  v.visit(tree);
+
+  return 0;
+}