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Revise implementation of case-insensitive command names

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Store both the as-written and lower-case command names and use
the latter to avoid case-insensitive string comparisons.

With this I obtain 2-6% speed increase (on Windows) for the configure
step with no significant changes in memory usage.  A case-insensitive
comparison is a lot slower than just calling `==` because the operator
will use things like memcmp, so prefer the latter.

The `cmSystemTools::LowerCase` function allocates a new string each time
it is called, so before this change we were allocating in:

* cmMakefile::Configure two times for each function
  (to look for `cmake_minimum_required` and `project`)
* cmMakefile::ExecuteCommand twice by function by calling
  cmState::GetCommand and copying the name

Now we are only allocating once by function instead of four.
This commit is contained in:
Florian Jacomme
2018-05-01 16:17:31 +02:00
committed by Brad King
parent 743f24bac6
commit b1a05d6c76
10 changed files with 64 additions and 41 deletions
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6
Source/cmForEachCommand.cxx
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@@ -29,10 +29,10 @@ bool cmForEachFunctionBlocker::IsFunctionBlocked(const cmListFileFunction& lff,
cmMakefile& mf,
cmExecutionStatus& inStatus)
{
if (!cmSystemTools::Strucmp(lff.Name.c_str(), "foreach")) {
if (lff.Name.Lower == "foreach") {
// record the number of nested foreach commands
this->Depth++;
} else if (!cmSystemTools::Strucmp(lff.Name.c_str(), "endforeach")) {
} else if (lff.Name.Lower == "endforeach") {
// if this is the endofreach for this statement
if (!this->Depth) {
// Remove the function blocker for this scope or bail.
@@ -97,7 +97,7 @@ bool cmForEachFunctionBlocker::IsFunctionBlocked(const cmListFileFunction& lff,
bool cmForEachFunctionBlocker::ShouldRemove(const cmListFileFunction& lff,
cmMakefile& mf)
{
if (!cmSystemTools::Strucmp(lff.Name.c_str(), "endforeach")) {
if (lff.Name.Lower == "endforeach") {
std::vector<std::string> expandedArguments;
mf.ExpandArguments(lff.Arguments, expandedArguments);
// if the endforeach has arguments then make sure