christoph/lecture-compilers
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changed bytecode version + bool exprs

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ChUrl
2021-01-22 16:43:56 +01:00
parent c61c8dcb22
commit ad7e86df24
1 changed files with 39 additions and 13 deletions
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52
src/main/java/codegen/CodeGenerator.java
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@ -86,7 +86,7 @@ public final class CodeGenerator {
System.out.println(" - Generating Jasmin Assembler...");
final String clazz = this.tree.getRoot().getChildren().get(1).getValue();
this.jasmin.append(".bytecode 55.0\n")
this.jasmin.append(".bytecode 49.0\n") // 55.0 has stricter verification => stackmap frames missing
.append(".source ").append(source).append("\n")
.append(".class public ").append(clazz).append("\n")
.append(".super java/lang/Object\n");
@ -152,30 +152,29 @@ public final class CodeGenerator {
// ifeq - if value is 0
// ifne - if value is not 0
private void cond(ASTNode node) {
final int currentLabel = this.labelCounter;
this.labelCounter++;
// Condition
this.generateNode(node.getChildren().get(0));
// Jump
this.jasmin.append("\t\tifeq LabelFalse").append(this.labelCounter).append("\n")
.append("\t\tifne LabelTrue").append(this.labelCounter).append("\n");
this.jasmin.append("\t\tifeq IFfalse").append(currentLabel).append("\n"); // ifeq: == 0 => false
// If branch
this.jasmin.append("LabelTrue").append(this.labelCounter).append(":\n");
// IFtrue branch
this.generateNode(node.getChildren().get(1));
this.jasmin.append("\t\tgoto LabelFinish").append(this.labelCounter).append("\n");
this.jasmin.append("\t\tgoto IFend").append(currentLabel).append("\n");
// Else branch
this.jasmin.append("LabelFalse").append(this.labelCounter).append(":\n");
// IFfalse branch
this.jasmin.append("IFfalse").append(currentLabel).append(":\n");
if (node.getChildren().size() == 3) {
// Else exists
this.generateNode(node.getChildren().get(2));
}
this.jasmin.append("\t\tgoto LabelFinish").append(this.labelCounter).append("\n"); // Optional
this.jasmin.append("LabelFinish").append(this.labelCounter).append(":\n");
// IFend branch
this.jasmin.append("IFend").append(currentLabel).append(":\n");
}
private void assign(ASTNode node) {
@ -215,7 +214,6 @@ public final class CodeGenerator {
inst = switch (node.getValue()) {
case "ADD" -> "";
case "SUB" -> "ldc -1\n\t\timul";
// case "NOT" -> ...
default -> throw new IllegalStateException("Unexpected value: " + node.getValue());
};
} else if (node.getChildren().size() == 2) {
@ -255,22 +253,50 @@ public final class CodeGenerator {
this.generateNode(node.getChildren().get(0));
// 1 -> 0, 0 -> 1?
inst = "ldc 1\n\t\tisub\n\t\tdup\n\t\timul"; // Subtract 1 and square for now
// inst = "ldc 1\n\t\tisub\n\t\tdup\n\t\timul"; // Subtract 1 and square for now
inst = "ldc 1\n\t\tixor"; // 0 ^1 = 1, 1 ^1 = 0
} else if (node.getChildren().size() == 2) {
// Binary operator
final int currentLabel = this.labelCounter;
this.labelCounter++;
this.generateNode(node.getChildren().get(0));
this.generateNode(node.getChildren().get(1));
final String type = this.nodeTypeMap.get(node.getChildren().get(0));
final String cmpeq = switch (type) {
case "INTEGER_TYPE", "BOOLEAN_TYPE" -> "if_icmpeq";
case "STRING_TYPE" -> "if_accmpeq";
default -> throw new IllegalStateException("Unexpected value: " + type);
};
final String cmpne = switch (type) {
case "INTEGER_TYPE", "BOOLEAN_TYPE" -> "if_icmpne";
case "STRING_TYPE" -> "if_accmpne";
default -> throw new IllegalStateException("Unexpected value: " + type);
};
inst = switch (node.getValue()) {
case "AND" -> "iand"; // Boolean
case "OR" -> "ior";
case "EQUAL" -> cmpeq + " EQtrue" + currentLabel // If equal jump to EQtrue
+ "\n\t\tldc 0" // If false load 0
+ "\n\t\tgoto EQend" + currentLabel // If false skip true branch
+ "\nEQtrue" + currentLabel + ":"
+ "\n\t\tldc 1" // if true load 1
+ "\nEQend" + currentLabel + ":";
case "NOT_EQUAL" -> cmpne + " NEtrue" + currentLabel // If not equal jump to NEtrue
+ "\n\t\tldc 0" // If false load 0
+ "\n\t\tgoto NEend" + currentLabel // If false skip true branch
+ "\nNEtrue" + currentLabel + ":"
+ "\n\t\tldc 1" // if true load 1
+ "\nNEend" + currentLabel + ":";
default -> throw new IllegalStateException("Unexpected value: " + node.getValue());
};
}
log("boolExpr(): " + node.getName() + ": " + node.getValue() + " => " + inst);
log("boolExpr(): " + node.getName() + ": " + node.getValue() + " => \n\t\t" + inst);
this.jasmin.append("\t\t")
.append(inst)