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[llvm-cov] Fix gcov version detection on big-endian

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This commit is contained in:
Fangrui Song 2020-06-07 08:05:44 -07:00
parent 69a07af4a7
commit d6e9f4ed95
1 changed files with 11 additions and 14 deletions
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25
include/llvm/ProfileData/GCOV.h
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@ -105,34 +105,31 @@ public:
/// readGCOVVersion - Read GCOV version.
bool readGCOVVersion(GCOV::GCOVVersion &Version) {
StringRef str = de.getBytes(cursor, 4);
int Major, Minor;
std::string str(de.getBytes(cursor, 4));
if (str.size() != 4)
return false;
if (de.isLittleEndian()) {
Major = str[3] >= 'A' ? (str[3] - 'A') * 10 + str[2] - '0' : str[3] - '0';
Minor = str[1] - '0';
} else {
Major = str[0] >= 'A' ? (str[0] - 'A') * 10 + str[1] - '0' : str[0] - '0';
Minor = str[3] - '0';
}
if (Major >= 9) {
if (de.isLittleEndian())
std::reverse(str.begin(), str.end());
int ver = str[0] >= 'A'
? (str[0] - 'A') * 100 + (str[1] - '0') * 10 + str[2] - '0'
: (str[0] - '0') * 10 + str[2] - '0';
if (ver >= 90) {
// PR gcov-profile/84846, r269678
Version = GCOV::V900;
return true;
} else if (Major >= 8) {
} else if (ver >= 80) {
// PR gcov-profile/48463
Version = GCOV::V800;
return true;
} else if (Major > 4 || (Major == 4 && Minor >= 8)) {
} else if (ver >= 48) {
// r189778: the exit block moved from the last to the second.
Version = GCOV::V408;
return true;
} else if (Major == 4 && Minor >= 7) {
} else if (ver >= 47) {
// r173147: split checksum into cfg checksum and line checksum.
Version = GCOV::V407;
return true;
} else if (Major == 4 || (Major == 3 && Minor >= 4)) {
} else if (ver >= 34) {
Version = GCOV::V304;
return true;
}