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Merge pull request #6173 from hercules-ci/fix-mkString-for-empty-string-view

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Fix `mkString` for empty `string_view`
This commit is contained in:
Eelco Dolstra 2022-03-07 17:10:41 +01:00 committed by GitHub
parent c28e2b1b29 da260f579d
commit 60a68a4fee
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 3 deletions
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16
src/libexpr/eval.cc
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@ -63,9 +63,15 @@ static char * dupString(const char * s)
}
static char * dupStringWithLen(const char * s, size_t size)
// When there's no need to write to the string, we can optimize away empty
// string allocations.
// This function handles makeImmutableStringWithLen(null, 0) by returning the
// empty string.
static const char * makeImmutableStringWithLen(const char * s, size_t size)
{
char * t;
if (size == 0)
return "";
#if HAVE_BOEHMGC
t = GC_STRNDUP(s, size);
#else
@ -75,6 +81,10 @@ static char * dupStringWithLen(const char * s, size_t size)
return t;
}
static inline const char * makeImmutableString(std::string_view s) {
return makeImmutableStringWithLen(s.data(), s.size());
}
RootValue allocRootValue(Value * v)
{
@ -805,7 +815,7 @@ LocalNoInline(void addErrorTrace(Error & e, const Pos & pos, const char * s, con
void Value::mkString(std::string_view s)
{
mkString(dupStringWithLen(s.data(), s.size()));
mkString(makeImmutableString(s));
}
@ -836,7 +846,7 @@ void Value::mkStringMove(const char * s, const PathSet & context)
void Value::mkPath(std::string_view s)
{
mkPath(dupStringWithLen(s.data(), s.size()));
mkPath(makeImmutableString(s));
}