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DataExtractor: Fix integer truncation issues in LEB128 extraction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162201 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-08-20 10:52:11 +00:00
parent bee05dc840
commit 46aed73955
2 changed files with 12 additions and 3 deletions
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6
lib/Support/DataExtractor.cpp
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@ -139,7 +139,7 @@ uint64_t DataExtractor::getULEB128(uint32_t *offset_ptr) const {
while (isValidOffset(offset)) {
byte = Data[offset++];
result |= (byte & 0x7f) << shift;
result |= uint64_t(byte & 0x7f) << shift;
shift += 7;
if ((byte & 0x80) == 0)
break;
@ -160,7 +160,7 @@ int64_t DataExtractor::getSLEB128(uint32_t *offset_ptr) const {
while (isValidOffset(offset)) {
byte = Data[offset++];
result |= (byte & 0x7f) << shift;
result |= uint64_t(byte & 0x7f) << shift;
shift += 7;
if ((byte & 0x80) == 0)
break;
@ -168,7 +168,7 @@ int64_t DataExtractor::getSLEB128(uint32_t *offset_ptr) const {
// Sign bit of byte is 2nd high order bit (0x40)
if (shift < 64 && (byte & 0x40))
result |= -(1 << shift);
result |= -(1ULL << shift);
*offset_ptr = offset;
return result;