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also search global variables assignment for live variables

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when traversing the AST to find live UBOs etc, also traverse
references to global module-level variables, incase they are
being filled in from UBOs etc.
This commit is contained in:
Malcolm Bechard 2020-07-14 12:59:57 -04:00
parent b481744aea
commit 5727fb313e
2 changed files with 49 additions and 12 deletions
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38
glslang/MachineIndependent/LiveTraverser.h
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@ -74,14 +74,33 @@ public:
for (unsigned int f = 0; f < globals.size(); ++f) {
TIntermAggregate* candidate = globals[f]->getAsAggregate();
if (candidate && candidate->getOp() == EOpFunction && candidate->getName() == name) {
functions.push_back(candidate);
destinations.push_back(candidate);
break;
}
}
}
typedef std::list<TIntermAggregate*> TFunctionStack;
TFunctionStack functions;
void pushGlobalReference(const TString& name)
{
TIntermSequence& globals = intermediate.getTreeRoot()->getAsAggregate()->getSequence();
for (unsigned int f = 0; f < globals.size(); ++f) {
TIntermAggregate* candidate = globals[f]->getAsAggregate();
if (candidate && candidate->getOp() == EOpSequence &&
candidate->getSequence().size() == 1 &&
candidate->getSequence()[0]->getAsBinaryNode()) {
TIntermBinary* binary = candidate->getSequence()[0]->getAsBinaryNode();
TIntermSymbol* symbol = binary->getLeft()->getAsSymbolNode();
if (symbol && symbol->getQualifier().storage == EvqGlobal &&
symbol->getName() == name) {
destinations.push_back(candidate);
break;
}
}
}
}
typedef std::list<TIntermAggregate*> TDestinationStack;
TDestinationStack destinations;
protected:
// To catch which function calls are not dead, and hence which functions must be visited.
@ -117,16 +136,27 @@ protected:
// and only visit each function once.
void addFunctionCall(TIntermAggregate* call)
{
// // just use the map to ensure we process each function at most once
// just use the map to ensure we process each function at most once
if (liveFunctions.find(call->getName()) == liveFunctions.end()) {
liveFunctions.insert(call->getName());
pushFunction(call->getName());
}
}
void addGlobalReference(const TString& name)
{
// just use the map to ensure we process each global at most once
if (liveGlobals.find(name) == liveGlobals.end()) {
liveGlobals.insert(name);
pushGlobalReference(name);
}
}
const TIntermediate& intermediate;
typedef std::unordered_set<TString> TLiveFunctions;
TLiveFunctions liveFunctions;
typedef std::unordered_set<TString> TLiveGlobals;
TLiveGlobals liveGlobals;
bool traverseAll;
private: