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#include "yql_library_compiler.h"
#include "yql_expr_optimize.h"
#include <yql/essentials/sql/sql.h>
#include <util/system/file.h>
#include <unordered_set>
#include <unordered_map>
namespace NYql {
namespace {
bool ReplaceNodes(TExprNode& node, const TNodeOnNodeOwnedMap& replaces, bool& hasChanges, TNodeSet& visited, TNodeSet& parents)
{
if (!node.ChildrenSize()) {
return true;
}
const auto pair = parents.emplace(&node);
if (!pair.second) {
return false;
}
if (!visited.emplace(&node).second) {
parents.erase(pair.first);
return true;
}
for (ui32 i = 0U; i < node.ChildrenSize(); ++i) {
auto& child = node.ChildRef(i);
if (const auto it = replaces.find(node.Child(i)); replaces.cend() != it) {
child = it->second;
hasChanges = true;
}
if (!ReplaceNodes(*node.Child(i), replaces, hasChanges, visited, parents)) {
child.Reset();
return false;
}
}
parents.erase(pair.first);
return true;
}
bool ReplaceNodes(TExprNode& node, const TNodeOnNodeOwnedMap& replaces, bool& hasChanges) {
TNodeSet visited;
TNodeSet parents;
return ReplaceNodes(node, replaces, hasChanges, visited, parents);
}
TString Load(const TString& path)
{
TFile file(path, EOpenModeFlag::RdOnly);
if (file.GetLength() <= 0)
return TString();
std::vector<TString::value_type> buffer(file.GetLength());
file.Load(buffer.data(), buffer.size());
return TString(buffer.data(), buffer.size());
}
}
bool OptimizeLibrary(TLibraryCohesion& cohesion, TExprContext& ctx) {
TExprNode::TListType tupleItems;
for (const auto& x : cohesion.Exports.Symbols()) {
tupleItems.push_back(x.second);
}
auto root = ctx.NewList(TPositionHandle(), std::move(tupleItems));
for (;;) {
auto status = ExpandApply(root, root, ctx);
if (status == IGraphTransformer::TStatus::Error) {
return false;
}
if (status == IGraphTransformer::TStatus::Ok) {
ctx.Step.Repeat(TExprStep::ExpandApplyForLambdas);
break;
}
}
ui32 index = 0;
for (auto& x : cohesion.Exports.Symbols(ctx)) {
x.second = root->ChildPtr(index++);
}
return true;
}
bool CompileLibrary(const TString& alias, const TString& script, TExprContext& ctx, TLibraryCohesion& cohesion, bool optimize)
{
TAstParseResult res;
if (alias.EndsWith(".sql")) {
NSQLTranslation::TTranslationSettings translationSettings;
translationSettings.SyntaxVersion = 1;
translationSettings.Mode = NSQLTranslation::ESqlMode::LIBRARY;
res = NSQLTranslation::SqlToYql(script, translationSettings);
} else {
res = ParseAst(script, nullptr, alias);
}
if (!res.IsOk()) {
for (const auto& originalError : res.Issues) {
TIssue error(originalError);
TStringBuilder message;
message << error.GetMessage() << " (at " << alias << ")";
error.SetMessage(message);
ctx.AddError(error);
}
return false;
}
if (!CompileExpr(*res.Root, cohesion, ctx))
return false;
if (!optimize) {
return true;
}
return OptimizeLibrary(cohesion, ctx);
}
bool LinkLibraries(THashMap<TString, TLibraryCohesion>& libs, TExprContext& ctx, TExprContext& ctxToClone, const TModulesTable* loadedModules) {
std::function<const TExportTable*(const TString&)> f = [loadedModules](const TString& normalizedModuleName) -> const TExportTable* {
if (!loadedModules) {
return nullptr;
}
return loadedModules->FindPtr(normalizedModuleName);
};
return LinkLibraries(libs, ctx, ctxToClone, f);
}
bool LinkLibraries(THashMap<TString, TLibraryCohesion>& libs, TExprContext& ctx, TExprContext& ctxToClone, const std::function<const TExportTable*(const TString&)>& module2ExportTable)
{
TNodeOnNodeOwnedMap clones, replaces;
for (const auto& lib : libs) {
for (const auto& import : lib.second.Imports) {
if (import.first->Dead()) {
continue;
}
if (import.second.first == lib.first) {
ctx.AddError(TIssue(ctxToClone.GetPosition(import.first->Pos()),
TStringBuilder() << "Library '" << lib.first << "' tries to import itself."));
return false;
}
const auto* exportTable = module2ExportTable(TModuleResolver::NormalizeModuleName(import.second.first));
const bool externalModule = exportTable;
if (!exportTable) {
if (const auto it = libs.find(import.second.first); libs.cend() != it) {
exportTable = &it->second.Exports;
}
}
if (!exportTable) {
ctx.AddError(TIssue(ctxToClone.GetPosition(import.first->Pos()),
TStringBuilder() << "Library '" << lib.first << "' has unresolved dependency from '" << import.second.first << "'."));
return false;
}
if (const auto ex = exportTable->Symbols().find(import.second.second); exportTable->Symbols().cend() != ex) {
replaces[import.first] = externalModule ? ctxToClone.DeepCopy(*ex->second, exportTable->ExprCtx(), clones, true, false) : ex->second;
} else {
ctx.AddError(TIssue(ctxToClone.GetPosition(import.first->Pos()),
TStringBuilder() << "Library '" << lib.first << "' has unresolved symbol '" << import.second.second << "' from '" << import.second.first << "'."));
return false;
}
}
}
if (!replaces.empty()) {
for (auto& lib : libs) {
for (auto& expo : lib.second.Exports.Symbols(lib.second.Exports.ExprCtx())) {
if (const auto find = replaces.find(expo.second.Get()); replaces.cend() != find)
expo.second = find->second;
}
}
}
for (bool hasChanges = !replaces.empty(); hasChanges;) {
hasChanges = false;
for (const auto& lib : libs) {
for (const auto& expo : lib.second.Exports.Symbols()) {
if (!ReplaceNodes(*expo.second, replaces, hasChanges)) {
ctx.AddError(TIssue(ctxToClone.GetPosition(expo.second->Pos()),
TStringBuilder() << "Cross reference detected under '" << expo.first << "' in '" << lib.first << "'."));
return false;
}
}
}
}
return true;
}
bool CompileLibraries(const TUserDataTable& userData, TExprContext& ctx, TModulesTable& modules, bool optimize)
{
THashMap<TString, TLibraryCohesion> libs;
for (const auto& data : userData) {
if (data.first.IsFile() && data.second.Usage.Test(EUserDataBlockUsage::Library)) {
TString libraryData;
const TString& alias = data.first.Alias();
if (data.second.Type == EUserDataType::PATH) {
libraryData = Load(data.second.Data);
} else if (data.second.Type == EUserDataType::RAW_INLINE_DATA) {
libraryData = data.second.Data;
}
if (!libraryData.empty()) {
if (CompileLibrary(alias, libraryData, ctx, libs[alias], optimize))
modules[TModuleResolver::NormalizeModuleName(alias)] = libs[alias].Exports;
else
return false;
}
}
}
return LinkLibraries(libs, ctx, ctx);
}
}
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