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handle zero-length arrays in truncate functions

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This commit is contained in:
Joel Dice 2012-03-17 12:57:59 -06:00
parent 333b6c59d4
commit 8cb6446bec
1 changed files with 13 additions and 7 deletions
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20
src/compile.cpp
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@ -6216,8 +6216,10 @@ truncateIntArray(Thread* t, object array, unsigned length)
PROTECT(t, array);
object newArray = makeIntArray(t, length);
memcpy(&intArrayBody(t, newArray, 0), &intArrayBody(t, array, 0),
length * 4);
if (length) {
memcpy(&intArrayBody(t, newArray, 0), &intArrayBody(t, array, 0),
length * 4);
}
return newArray;
}
@ -6230,8 +6232,10 @@ truncateArray(Thread* t, object array, unsigned length)
PROTECT(t, array);
object newArray = makeArray(t, length);
memcpy(&arrayBody(t, newArray, 0), &arrayBody(t, array, 0),
length * BytesPerWord);
if (length) {
memcpy(&arrayBody(t, newArray, 0), &arrayBody(t, array, 0),
length * BytesPerWord);
}
return newArray;
}
@ -6244,9 +6248,11 @@ truncateLineNumberTable(Thread* t, object table, unsigned length)
PROTECT(t, table);
object newTable = makeLineNumberTable(t, length);
memcpy(&lineNumberTableBody(t, newTable, 0),
&lineNumberTableBody(t, table, 0),
length * sizeof(uint64_t));
if (length) {
memcpy(&lineNumberTableBody(t, newTable, 0),
&lineNumberTableBody(t, table, 0),
length * sizeof(uint64_t));
}
return newTable;
}