From 311a001a1400bedd0dc005d79f4f83706078e2e2 Mon Sep 17 00:00:00 2001
From: SirOlaf <34164198+SirOlaf@users.noreply.github.com>
Date: Sun, 21 Jul 2024 08:55:55 +0200
Subject: [PATCH] Unary negation operator (#21)

---
 doc/nifc-spec.md        |  1 +
 src/nifc/genexprs.nim   | 15 +++------------
 src/nifc/nifc_model.nim |  1 +
 3 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/doc/nifc-spec.md b/doc/nifc-spec.md
index 5eb6da0d..ec4d2234 100644
--- a/doc/nifc-spec.md
+++ b/doc/nifc-spec.md
@@ -94,6 +94,7 @@ Expr ::= Number | CharLiteral | StringLiteral |
          (and Expr Expr) | # "&&"
          (or Expr Expr) | # "||"
          (not Expr) | # "!"
+         (neg Expr) |
          (sizeof Expr) |
          (oconstr Type (kv Symbol Expr)*) |  # (object constructor){...}
          (aconstr Type Expr*) |              # array constructor
diff --git a/src/nifc/genexprs.nim b/src/nifc/genexprs.nim
index 66ce8382..ccbe2c03 100644
--- a/src/nifc/genexprs.nim
+++ b/src/nifc/genexprs.nim
@@ -63,12 +63,7 @@ proc genLvalue(c: var GeneratedCode; t: Tree; n: NodePos) =
     let name = mangle(c.m.lits.strings[lit])
     c.add name
     c.requestedSyms.incl name
-  of DerefC:
-    let arg = n.firstSon
-    c.add ParLe
-    c.add "*"
-    genx c, t, arg
-    c.add ParRi
+  of DerefC: unop "*"
   of AtC:
     let (a, i) = sons2(t, n)
     genx c, t, a
@@ -148,12 +143,7 @@ proc genx(c: var GeneratedCode; t: Tree; n: NodePos) =
     c.add ParLe
     genx c, t, arg
     c.add ParRi
-  of AddrC:
-    let arg = n.firstSon
-    c.add ParLe
-    c.add "&"
-    genx c, t, arg
-    c.add ParRi
+  of AddrC: unop "&"
   of SizeofC:
     let arg = n.firstSon
     c.add "sizeof"
@@ -175,6 +165,7 @@ proc genx(c: var GeneratedCode; t: Tree; n: NodePos) =
   of AndC: cmpop " && "
   of OrC: cmpop " || "
   of NotC: unOp " !"
+  of NegC: unOp " -"
   of EqC: cmpop " == "
   of LeC: cmpop " <= "
   of LtC: cmpop " < "
diff --git a/src/nifc/nifc_model.nim b/src/nifc/nifc_model.nim
index 3d088aff..7956d3af 100644
--- a/src/nifc/nifc_model.nim
+++ b/src/nifc/nifc_model.nim
@@ -26,6 +26,7 @@ type
     AndC = "and"
     OrC = "or"
     NotC = "not"
+    NegC = "neg"
     SizeofC = "sizeof"
     OconstrC = "oconstr"
     AconstrC = "aconstr"