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4716f61fba
Replace the use of bool and pointer returns for `walkToXXXPre`/`walkToXXXPost`, and instead use explicit actions such as `Action::Continue(E)`, `Action::SkipChildren(E)`, and `Action::Stop()`. There are also conditional variants, e.g `Action::SkipChildrenIf`, `Action::VisitChildrenIf`, and `Action::StopIf`. There is still more work that can be done here, in particular: - SourceEntityWalker still needs to be migrated. - Some uses of `return false` in pre-visitation methods can likely now be replaced by `Action::Stop`. - We still use bool and pointer returns internally within the ASTWalker traversal, which could likely be improved. But I'm leaving those as future work for now as this patch is already large enough.
144 lines
4.5 KiB
C++
144 lines
4.5 KiB
C++
//===--- InstrumenterSupport.cpp - Instrumenter Support -------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the supporting functions for writing instrumenters of
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// the Swift AST.
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//
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//===----------------------------------------------------------------------===//
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#include "InstrumenterSupport.h"
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#include "swift/AST/DiagnosticSuppression.h"
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#include "swift/AST/SourceFile.h"
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#include "swift/Demangling/Punycode.h"
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#include "llvm/Support/Path.h"
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using namespace swift;
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using namespace swift::instrumenter_support;
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namespace {
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class ErrorGatherer : public DiagnosticConsumer {
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private:
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bool error = false;
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DiagnosticEngine &diags;
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public:
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ErrorGatherer(DiagnosticEngine &diags) : diags(diags) {
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diags.addConsumer(*this);
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}
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~ErrorGatherer() override { diags.takeConsumers(); }
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void handleDiagnostic(SourceManager &SM,
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const DiagnosticInfo &Info) override {
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if (Info.Kind == swift::DiagnosticKind::Error) {
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error = true;
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}
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DiagnosticEngine::formatDiagnosticText(llvm::errs(), Info.FormatString,
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Info.FormatArgs);
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llvm::errs() << "\n";
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}
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bool hadError() { return error; }
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};
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class ErrorFinder : public ASTWalker {
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bool error = false;
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public:
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ErrorFinder() {}
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PreWalkResult<Expr *> walkToExprPre(Expr *E) override {
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if (isa<ErrorExpr>(E) || !E->getType() || E->getType()->hasError()) {
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error = true;
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return Action::SkipChildren(E);
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}
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return Action::Continue(E);
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}
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PreWalkAction walkToDeclPre(Decl *D) override {
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if (auto *VD = dyn_cast<ValueDecl>(D)) {
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if (!VD->hasInterfaceType() || VD->getInterfaceType()->hasError()) {
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error = true;
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return Action::SkipChildren();
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}
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}
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return Action::Continue();
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}
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bool hadError() { return error; }
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};
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} // end anonymous namespace
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InstrumenterBase::InstrumenterBase(ASTContext &C, DeclContext *DC)
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: Context(C), TypeCheckDC(DC), CF(*this) {
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// Prefixes for module and file vars
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const std::string builtinPrefix = "__builtin";
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const std::string modulePrefix = "_pg_module_";
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const std::string filePrefix = "_pg_file_";
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// Setup Module identifier
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std::string moduleName =
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std::string(TypeCheckDC->getParentModule()->getName());
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Identifier moduleIdentifier =
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Context.getIdentifier(builtinPrefix + modulePrefix + moduleName);
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SmallVector<ValueDecl *, 1> results;
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TypeCheckDC->getParentModule()->lookupValue(
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moduleIdentifier, NLKind::UnqualifiedLookup, results);
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if (results.size() == 1)
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ModuleIdentifier = results.front()->createNameRef();
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// Setup File identifier
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StringRef filePath = TypeCheckDC->getParentSourceFile()->getFilename();
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StringRef fileName = llvm::sys::path::stem(filePath);
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std::string filePunycodeName;
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Punycode::encodePunycodeUTF8(fileName, filePunycodeName, true);
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Identifier fileIdentifier =
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Context.getIdentifier(builtinPrefix + modulePrefix + moduleName +
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filePrefix + filePunycodeName);
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results.clear();
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TypeCheckDC->getParentModule()->lookupValue(
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fileIdentifier, NLKind::UnqualifiedLookup, results);
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if (results.size() == 1)
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FileIdentifier = results.front()->createNameRef();
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}
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void InstrumenterBase::anchor() {}
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bool InstrumenterBase::doTypeCheckImpl(ASTContext &Ctx, DeclContext *DC,
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Expr * &parsedExpr) {
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DiagnosticSuppression suppression(Ctx.Diags);
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ErrorGatherer errorGatherer(Ctx.Diags);
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TypeChecker::typeCheckExpression(parsedExpr, DC, /*contextualInfo=*/{});
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if (parsedExpr) {
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ErrorFinder errorFinder;
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parsedExpr->walk(errorFinder);
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if (!errorFinder.hadError() && !errorGatherer.hadError()) {
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return true;
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}
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}
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return false;
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}
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Expr *InstrumenterBase::buildIDArgumentExpr(Optional<DeclNameRef> name,
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SourceRange SR) {
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if (!name)
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return IntegerLiteralExpr::createFromUnsigned(Context, 0);
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return new (Context) UnresolvedDeclRefExpr(*name, DeclRefKind::Ordinary,
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DeclNameLoc(SR.End));
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}
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