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package no.eliashaugsbakk.kompilator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class AssemblyBuilder {
Map<String, String> stringVariables = new HashMap<>();
StringBuilder finalAssembly;
StringBuilder text;
StringBuilder rodata;
StringBuilder data;
private final static String exit = """
mov rax, 60
xor rdi, rdi
syscall
""";
private final static String printHelloWorld = """
mov rax, 1
mov rdi, 1
lea rsi, [hellostring]
lea rdx, [hellolen]
syscall
""";
public AssemblyBuilder() {
this.finalAssembly = new StringBuilder(".intel_syntax noprefix\n.global _start\n");
// CPU instructions
this.text = new StringBuilder(".text\n_start:\n\n");
// Read only data
this.rodata = new StringBuilder("\n.section .rodata\n");
// Global initialized variables, Read - Write
this.data = new StringBuilder("\n.data\n");
}
String createAssembly(List<String> IR) {
for (String line : IR) {
line = line.trim();
if (line.startsWith("print")) {
handlePrint(line);
} else if (line.contains("=")) {
handleAssignment(line);
}
}
this.text.append(exit);
this.finalAssembly.append(text);
this.finalAssembly.append(rodata);
this.finalAssembly.append(data);
return this.finalAssembly.toString();
}
private void handleAssignment(String line) {
/* Example IR:
variable_name: type = data
str1: string = "Hello world"
*/
String name = line.substring(0, line.indexOf(":"));
String dataType = line.substring(line.indexOf(":") + 2, line.indexOf("=") - 1);
String value = line.substring(line.indexOf("=") + 2);
if (dataType.contains("string")) {
assignString(name, value);
} else {
IO.println("err: Unknown data type: " + dataType);
}
}
private void assignString(String name, String value) {
value = value.substring(1, value.length() - 1);
this.rodata.append(String.format("""
%s: .ascii "%s"
""", name, value));
this.stringVariables.put(name, value);
}
void handlePrint(String line) {
String variableName = line.substring(line.indexOf("(") + 1, line.lastIndexOf(")"));
this.text.append(String.format("""
mov rax, 1
mov rdi, 1
lea rsi, [%s]
lea rdx, [%d]
syscall
""", variableName, this.stringVariables.get(variableName).length()));
}
}
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