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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSLSymbolTable.h"
#include "SkSLUnresolvedFunction.h"
namespace SkSL {
std::vector<const FunctionDeclaration*> SymbolTable::GetFunctions(const Symbol& s) {
switch (s.fKind) {
case Symbol::kFunctionDeclaration_Kind:
return { &((FunctionDeclaration&) s) };
case Symbol::kUnresolvedFunction_Kind:
return ((UnresolvedFunction&) s).fFunctions;
default:
return std::vector<const FunctionDeclaration*>();
}
}
const Symbol* SymbolTable::operator[](const std::string& name) {
const auto& entry = fSymbols.find(name);
if (entry == fSymbols.end()) {
if (fParent) {
return (*fParent)[name];
}
return nullptr;
}
if (fParent) {
auto functions = GetFunctions(*entry->second);
if (functions.size() > 0) {
bool modified = false;
const Symbol* previous = (*fParent)[name];
if (previous) {
auto previousFunctions = GetFunctions(*previous);
for (const FunctionDeclaration* prev : previousFunctions) {
bool found = false;
for (const FunctionDeclaration* current : functions) {
if (current->matches(*prev)) {
found = true;
break;
}
}
if (!found) {
functions.push_back(prev);
modified = true;
}
}
if (modified) {
ASSERT(functions.size() > 1);
return this->takeOwnership(new UnresolvedFunction(functions));
}
}
}
}
return entry->second;
}
Symbol* SymbolTable::takeOwnership(Symbol* s) {
fOwnedPointers.push_back(std::unique_ptr<Symbol>(s));
return s;
}
void SymbolTable::add(const std::string& name, std::unique_ptr<Symbol> symbol) {
this->addWithoutOwnership(name, symbol.get());
fOwnedPointers.push_back(std::move(symbol));
}
void SymbolTable::addWithoutOwnership(const std::string& name, const Symbol* symbol) {
const auto& existing = fSymbols.find(name);
if (existing == fSymbols.end()) {
fSymbols[name] = symbol;
} else if (symbol->fKind == Symbol::kFunctionDeclaration_Kind) {
const Symbol* oldSymbol = existing->second;
if (oldSymbol->fKind == Symbol::kFunctionDeclaration_Kind) {
std::vector<const FunctionDeclaration*> functions;
functions.push_back((const FunctionDeclaration*) oldSymbol);
functions.push_back((const FunctionDeclaration*) symbol);
UnresolvedFunction* u = new UnresolvedFunction(std::move(functions));
fSymbols[name] = u;
this->takeOwnership(u);
} else if (oldSymbol->fKind == Symbol::kUnresolvedFunction_Kind) {
std::vector<const FunctionDeclaration*> functions;
for (const auto* f : ((UnresolvedFunction&) *oldSymbol).fFunctions) {
functions.push_back(f);
}
functions.push_back((const FunctionDeclaration*) symbol);
UnresolvedFunction* u = new UnresolvedFunction(std::move(functions));
fSymbols[name] = u;
this->takeOwnership(u);
}
} else {
fErrorReporter.error(symbol->fPosition, "symbol '" + name + "' was already defined");
}
}
} // namespace
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