nitrix/klang
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

if statement asm generation now omits else labels if no else was defined

Browse Source
This commit is contained in:
Marvin Kaiser
2019-12-17 15:12:36 +01:00
parent bf50587cdb
commit aaf1c3195d
1 changed files with 24 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
src/main/java/de/hsrm/compiler/Klang/visitors/GenASM.java
View File

@@ -137,24 +137,30 @@ public class GenASM implements Visitor<Void> {
@Override
public Void visit(IfStatement e) {
int then = ++lCount;
int end = ++lCount;
e.cond.welcome(this);
this.ex.write(" cmp $0, %rax\n");
this.ex.write(" jz .L" + then + "\n");
// else Part
if (e.alt != null) {
e.alt.welcome(this);
} else if (e.elif != null) {
e.elif.welcome(this);
}
this.ex.write(" jmp .L" + end + "\n");
// then Part
this.ex.write(".L" + then + ":\n");
e.then.welcome(this);
this.ex.write(".L" + end + ":\n");
return null;
int lblElse = ++lCount;
int lblEnd = ++lCount;
boolean hasElse = e.alt != null || e.elif != null;
e.cond.welcome(this);
this.ex.write(" cmp $0, %rax\n");
// in case of cond evaluating to false, jump to else/elif
// Jump to end if there is no else part, this saves a label declaration
if (hasElse) {
this.ex.write(" jz .L" + lblElse + "\n");
} else {
this.ex.write(" jz .L" + lblEnd + "\n");
}
e.then.welcome(this);
if (hasElse) {
this.ex.write(" jmp .L" + lblEnd + "\n");
this.ex.write(".L" + lblElse + ":\n");
if (e.alt != null) {
e.alt.welcome(this);
} else {
e.elif.welcome(this);
}
}
this.ex.write(".L" + lblEnd + ":\n");
return null;
}
@Override