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Simplify computation of visible module set.

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llvm-svn: 193850
This commit is contained in:
Richard Smith
2013-11-01 02:19:14 +00:00
parent b9657033cc
commit dde17e74fa
2 changed files with 7 additions and 16 deletions
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6
clang/include/clang/Basic/Module.h
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@@ -403,10 +403,10 @@ public:
submodule_iterator submodule_end() { return SubModules.end(); }
submodule_const_iterator submodule_end() const { return SubModules.end(); }
/// \brief Returns the exported modules based on the wildcard restrictions.
/// \brief Appends this module's list of exported modules to \p Exported.
///
/// This returns a subset of immediately imported modules (the ones that are
/// exported), not the complete set of exported modules.
/// This provides a subset of immediately imported modules (the ones that are
/// directly exported), not the complete set of exported modules.
void getExportedModules(SmallVectorImpl<Module *> &Exported) const;
static StringRef getModuleInputBufferName() {

17
clang/lib/Basic/Module.cpp
View File

@@ -253,22 +253,13 @@ void Module::buildVisibleModulesCache() const {
VisibleModulesCache.insert(this);
// Every imported module is visible.
// Every module exported by an imported module is visible.
llvm::SmallPtrSet<Module *, 4> Visited;
llvm::SmallVector<Module *, 4> Exports;
SmallVector<Module *, 4> Stack(Imports.begin(), Imports.end());
SmallVector<Module *, 16> Stack(Imports.begin(), Imports.end());
while (!Stack.empty()) {
Module *CurrModule = Stack.pop_back_val();
VisibleModulesCache.insert(CurrModule);
CurrModule->getExportedModules(Exports);
for (SmallVectorImpl<Module *>::iterator I = Exports.begin(),
E = Exports.end();
I != E; ++I) {
Module *Exported = *I;
if (Visited.insert(Exported))
Stack.push_back(Exported);
}
// Every module transitively exported by an imported module is visible.
if (VisibleModulesCache.insert(CurrModule).second)
CurrModule->getExportedModules(Stack);
}
}