From 0230e4ab3fec665df0d802d8b408c94cc7e83792 Mon Sep 17 00:00:00 2001
From: Xun Yang <x299yang@uwaterloo.ca>
Date: Mon, 13 Apr 2020 13:46:43 -0400
Subject: [PATCH] divide by 0 check
---
ExprPrimaryNodes.py | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/ExprPrimaryNodes.py b/ExprPrimaryNodes.py
index 033c66c..71674cb 100644
--- a/ExprPrimaryNodes.py
+++ b/ExprPrimaryNodes.py
@@ -619,7 +619,7 @@ class ExprNode(ASTNode):
leftArg = ArgsNode(self.parseTree, self.typeName, [self.left])
# 3. Put it all together
concatLeft = MethodInvNode(self.parseTree, self.typeName, valueOfNameNode, leftArg)
-
+
if self.right.myType.name != 'java.lang.String':
# 2. Make ArgsNode
rightArg = ArgsNode(self.parseTree, self.typeName, [self.right])
@@ -773,7 +773,7 @@ class ExprNode(ASTNode):
return
# Binary operations:
-
+
# Number Add, Subtract, Multiply
if self.op in ['+', '-', '*']:
# operation -> generated code
@@ -791,6 +791,11 @@ class ExprNode(ASTNode):
# switch eax and ebx, because "idiv ebx" -> eax = edx:eax / ebx
self.code += p('xchg', 'eax', 'ebx')
+ # divide by 0 check
+ if self.op == '/':
+ self.code += p("cmp", "ebx", "0")
+ self.code += p("je", "H__Throw_Exception")
+
self.code += p('push', 'edx') # save edx in case someone else was using it
self.code += p('cdq', '', None, " set edx to the sign of eax")
self.code += p("idiv", "ebx", "", " left:eax " + self.op + " right:ebx")
--
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