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add unary negation #23

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add unary negation #23

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1 change: 1 addition & 0 deletions src/main/cup/parser.cup
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Original file line number Diff line number Diff line change
Expand Up @@ -53,5 +53,6 @@ term ::=

factor ::=
LITNUM:x {: RESULT = new ExpNum(x); :}
| MINUS factor:x {: RESULT = new ExpNegate(x); :}
| LPAREN exp:x RPAREN {: RESULT = x; :}
;
33 changes: 33 additions & 0 deletions src/main/java/absyn/ExpNegate.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@
package absyn;

import javaslang.collection.Tree;

import static org.bytedeco.javacpp.LLVM.*;

import static org.bytedeco.javacpp.LLVM.LLVMBuildFSub;
import static org.bytedeco.javacpp.LLVM.LLVMConstReal;
import static org.bytedeco.javacpp.LLVM.LLVMDoubleType;

/**
* Created by brenokeller on 10/19/16.
*/
public class ExpNegate extends Exp {

public final Exp arg;

public ExpNegate(Exp arg) {
this.arg = arg;
}

@Override
public LLVMValueRef codegen(LLVMModuleRef module, LLVMBuilderRef builder) {
final LLVMValueRef v_arg = arg.codegen(module, builder);
final LLVMValueRef zero = LLVMConstReal(LLVMDoubleType(), 0);
return LLVMBuildFSub(builder, zero, v_arg, "negatetmp");
}

@Override
public Tree.Node<String> toTree() {
return Tree.of("ExpNegate ", arg.toTree());
}
}