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Add llvm::function_ref (and a couple of uses of it), representing a type-erased reference to a callable object.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208025 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Smith
2014-05-06 01:01:29 +00:00
parent 9331beb910
commit 245e8bdfba
7 changed files with 153 additions and 46 deletions
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6
lib/Transforms/IPO/GlobalDCE.cpp
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@@ -54,16 +54,16 @@ namespace {
bool RemoveUnusedGlobalValue(GlobalValue &GV);
};
}
/// Returns true if F contains only a single "ret" instruction.
bool isEmptyFunction(void *Context, Function *F) {
static bool isEmptyFunction(Function *F) {
BasicBlock &Entry = F->getEntryBlock();
if (Entry.size() != 1 || !isa<ReturnInst>(Entry.front()))
return false;
ReturnInst &RI = cast<ReturnInst>(Entry.front());
return RI.getReturnValue() == NULL;
}
}
char GlobalDCE::ID = 0;
INITIALIZE_PASS(GlobalDCE, "globaldce",
@@ -75,7 +75,7 @@ bool GlobalDCE::runOnModule(Module &M) {
bool Changed = false;
// Remove empty functions from the global ctors list.
Changed |= optimizeGlobalCtorsList(M, isEmptyFunction, nullptr);
Changed |= optimizeGlobalCtorsList(M, isEmptyFunction);
// Loop over the module, adding globals which are obviously necessary.
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {

7
lib/Transforms/IPO/GlobalOpt.cpp
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@@ -3022,10 +3022,9 @@ bool GlobalOpt::runOnModule(Module &M) {
LocalChange |= OptimizeFunctions(M);
// Optimize global_ctors list.
LocalChange |= optimizeGlobalCtorsList(M, [](void *C, Function *F) -> bool {
GlobalOpt *self = static_cast<GlobalOpt *>(C);
return EvaluateStaticConstructor(F, self->DL, self->TLI);
}, this);
LocalChange |= optimizeGlobalCtorsList(M, [&](Function *F) {
return EvaluateStaticConstructor(F, DL, TLI);
});
// Optimize non-address-taken globals.
LocalChange |= OptimizeGlobalVars(M);

6
lib/Transforms/Utils/CtorUtils.cpp
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@@ -132,8 +132,8 @@ GlobalVariable *findGlobalCtors(Module &M) {
/// Call "ShouldRemove" for every entry in M's global_ctor list and remove the
/// entries for which it returns true. Return true if anything changed.
bool optimizeGlobalCtorsList(Module &M, ShouldRemoveCtor ShouldRemove,
void *Context) {
bool optimizeGlobalCtorsList(Module &M,
function_ref<bool(Function *)> ShouldRemove) {
GlobalVariable *GlobalCtors = findGlobalCtors(M);
if (!GlobalCtors)
return false;
@@ -163,7 +163,7 @@ bool optimizeGlobalCtorsList(Module &M, ShouldRemoveCtor ShouldRemove,
continue;
// If we can evaluate the ctor at compile time, do.
if (ShouldRemove(Context, F)) {
if (ShouldRemove(F)) {
Ctors.erase(Ctors.begin() + i);
MadeChange = true;
--i;