From 1a7cbc93b80fd16925cff0c310d55eab426c8f44 Mon Sep 17 00:00:00 2001
From: Nicholas Wesley Robinson <nwrobinson@uwaterloo.ca>
Date: Sun, 12 Apr 2020 23:24:12 -0400
Subject: [PATCH] populate strliteral char array
---
UnitNodes.py | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/UnitNodes.py b/UnitNodes.py
index 294bc05..88b3200 100644
--- a/UnitNodes.py
+++ b/UnitNodes.py
@@ -65,12 +65,15 @@ class LiteralNode(ASTNode):
self.code += ";Start of String Literal Creation for class " + self.typeName + "\n"
# generate array of characters
# then call new String(array)
+
+ # remove quotation marks
+ value = self.value[1:-1]
# FIRST: create char array for this string TODO figure out how to populate this array
# 1. Allocating space for the char array in heap
# Note: uses ecx to temporarily store the array length
self.code += ";Start of char array creation\n" + \
- p(instruction="push", arg1="eax", arg2=str(len(self.value)), comment="array length") + \
+ p(instruction="mov", arg1="eax", arg2=str(len(value)), comment="array length") + \
p(instruction="push", arg1="ecx", comment="saving ecx's value") + \
p(instruction="mov", arg1="ecx", arg2="eax", comment="ecx now stroes the array's length") + \
p(instruction="add", arg1="eax", arg2=2, comment="number of items to allocate on heap") + \
@@ -85,7 +88,22 @@ class LiteralNode(ASTNode):
# 3. Storing length in the second slot
self.code += p(instruction="mov", arg1="[eax+4]", arg2="ecx", comment="storing array length in second slot")
- # 4. Restoring ecx
+ # 4. populate array with this string literal's chars
+ self.code += ";Start of populating char array\n"
+ # 4.1. store array pointer
+ self.code += p(instruction="push", arg1="eax", comment="push arrray pointer")
+ # 4.2. point to a[0]
+ self.code += p(instruction="add", arg1="eax", arg2=8, comment="eax points at a[0]")
+ # 4.3. loop through string
+ for i in range(len(value)):
+ if i != 0:
+ self.code += p(instruction="add", arg1="eax", arg2=4, comment="eax points at a["+str(i)+"]")
+ self.code += p(instruction="mov", arg1="[eax]", arg2=str("dword \""+value[i]+"\""), comment="a["+str(i)+"]="+str(value[i]))
+ # 4.4. restore array pointer
+ self.code += p(instruction="pop", arg1="eax", comment="eax is pointer to array")
+ self.code += ";End of populating char array\n"
+
+ # 5. Restoring ecx
self.code += p(instruction="pop", arg1="ecx", comment="restoring register ecx")
self.code += ";End of char array creation\n"
--
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