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Speed improvements for ULEB128 reading from James McIlree.

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llvm-svn: 144581
This commit is contained in:
Greg Clayton
2011-11-14 22:56:58 +00:00
parent 7013a19e8a
commit 02947e04f6
1 changed files with 20 additions and 17 deletions
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37
lldb/source/Core/DataExtractor.cpp
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@@ -1147,27 +1147,30 @@ DataExtractor::PeekCStr (uint32_t offset) const
uint64_t
DataExtractor::GetULEB128 (uint32_t *offset_ptr) const
{
uint64_t result = 0;
if ( m_start < m_end )
const uint8_t *src = m_start + *offset_ptr;
const uint8_t *end = m_end;
if (src < end)
{
int shift = 0;
const uint8_t *src = m_start + *offset_ptr;
uint8_t byte;
int bytecount = 0;
while (src < m_end)
uint64_t result = *src++;
if (result >= 0x80)
{
bytecount++;
byte = *src++;
result |= (byte & 0x7f) << shift;
if ((byte & 0x80) == 0)
break;
shift += 7;
result &= 0x7f;
int shift = 7;
while (src < end)
{
uint8_t byte = *src++;
result |= (byte & 0x7f) << shift;
if ((byte & 0x80) == 0)
break;
shift += 7;
}
}
*offset_ptr += bytecount;
*offset_ptr = (uint32_t)(src - m_start);
return result;
}
return result;
return 0;
}
//----------------------------------------------------------------------