christoph/lecture-compilers
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add unary codegen for +, -

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Christoph
2021-01-21 19:03:04 +01:00
parent 8fe5659f21
commit b703ae2b31
1 changed files with 29 additions and 11 deletions
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40
src/main/java/codegen/CodeGenerator.java
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@ -102,6 +102,8 @@ public final class CodeGenerator {
// TODO: Indentation?
// TODO: Stack size
// TODO: Typen
// TODO: Variablengröße
private static void generateMain(AST ast, StringBuilder jasmin, Map<String, Integer> varMap) {
jasmin.append(".method public static main([Ljava/lang/String;)V\n")
.append(".limit stack 10\n")
@ -135,19 +137,35 @@ public final class CodeGenerator {
.append("\n");
}
// TODO: Unary operators
private static void expr(ASTNode node, StringBuilder jasmin, Map<String, Integer> varMap) {
generateNode(node.getChildren().get(0), jasmin, varMap);
generateNode(node.getChildren().get(1), jasmin, varMap);
String inst = "";
final String inst = switch (node.getValue()) { //!: Type dependant
case "ADD" -> "iadd"; // Integer
case "SUB" -> "isub";
case "MUL" -> "imul";
case "DIV" -> "idiv";
case "MOD" -> "irem"; // Remainder operator
default -> throw new IllegalStateException("Unexpected value: " + node.getValue());
};
if (node.getChildren().size() == 1) {
// Unary operator
generateNode(node.getChildren().get(0), jasmin, varMap);
inst = switch(node.getValue()) { //!: Type dependant
case "ADD" -> "";
case "SUB" -> "ldc -1\nimul";
// case "NOT" -> ...
default -> throw new IllegalStateException("Unexpected value: " + node.getValue());
};
} else if (node.getChildren().size() == 2) {
// Binary operator
generateNode(node.getChildren().get(0), jasmin, varMap);
generateNode(node.getChildren().get(1), jasmin, varMap);
inst = switch (node.getValue()) { //!: Type dependant
case "ADD" -> "iadd"; // Integer
case "SUB" -> "isub";
case "MUL" -> "imul";
case "DIV" -> "idiv";
case "MOD" -> "irem"; // Remainder operator
default -> throw new IllegalStateException("Unexpected value: " + node.getValue());
};
}
jasmin.append(inst)
.append("\n");