christoph/lecture-compilers
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implement loop generation

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ChUrl
2021-01-22 17:56:12 +01:00
parent 763f58b09a
commit c99de7dcc5
1 changed files with 21 additions and 4 deletions
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25
src/main/java/codegen/CodeGenerator.java
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@ -24,6 +24,7 @@ public final class CodeGenerator {
final Class<?> gen = CodeGenerator.class;
map = Map.ofEntries(
entry("cond", gen.getDeclaredMethod("cond", ASTNode.class)),
entry("loop", gen.getDeclaredMethod("loop", ASTNode.class)),
entry("assignment", gen.getDeclaredMethod("assign", ASTNode.class)),
entry("expr", gen.getDeclaredMethod("expr", ASTNode.class)),
// Leafs
@ -127,10 +128,7 @@ public final class CodeGenerator {
return this.jasmin;
}
// TODO: Indentation?
// TODO: Stack size
// TODO: Typen
// TODO: Variablengröße
private void generateMain() {
this.jasmin.append(".method public static main([Ljava/lang/String;)V\n")
.append("\t.limit stack 10\n")
@ -157,7 +155,6 @@ public final class CodeGenerator {
}
}
// TODO: boolean expressions for conditions
// ifeq - if value is 0
// ifne - if value is not 0
private void cond(ASTNode node) {
@ -186,6 +183,26 @@ public final class CodeGenerator {
this.jasmin.append("IFend").append(currentLabel).append(":\n");
}
private void loop(ASTNode node) {
final int currentLabel = this.labelCounter;
this.labelCounter++;
this.jasmin.append("LOOPstart").append(currentLabel).append(":\n");
// Condition
this.generateNode(node.getChildren().get(0).getChildren().get(1));
// Jump
this.jasmin.append("\t\tifeq LOOPend").append(currentLabel).append("\n"); // ifeq: == 0 => Loop stopped
// Loop body
this.generateNode(node.getChildren().get(1));
this.jasmin.append("\t\tgoto LOOPstart").append(currentLabel).append("\n"); // Jump to Loop start
// Loop end
this.jasmin.append("LOOPend").append(currentLabel).append(":\n");
}
private void assign(ASTNode node) {
this.generateNode(node.getChildren().get(0));