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llvm-cov: When reading strings in gcov data, skip leading zeros

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It seems that gcov, when faced with a string that is apparently zero
length, just keeps reading words until it finds a length it likes
better. I'm not really sure why this is, but it's simple enough to
make llvm-cov follow suit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204881 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Justin Bogner 2014-03-27 00:06:36 +00:00
parent f20d9ee6a6
commit 11d89f4c27
1 changed files with 5 additions and 2 deletions
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7
include/llvm/Support/GCOV.h
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@ -204,8 +204,11 @@ public:
}
bool readString(StringRef &Str) {
uint32_t Len;
if (!readInt(Len)) return false;
uint32_t Len = 0;
// Keep reading until we find a non-zero length. This emulates gcov's
// behaviour, which appears to do the same.
while (Len == 0)
if (!readInt(Len)) return false;
Len *= 4;
if (Buffer->getBuffer().size() < Cursor+Len) {
errs() << "Unexpected end of memory buffer: " << Cursor+Len << ".\n";