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//===- Synthesis.cpp ------------------------------------------*- C++ -*-=====//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/TokenKinds.h"
#include "clang/Tooling/Syntax/BuildTree.h"
#include "clang/Tooling/Syntax/Tree.h"
#include "clang/Tooling/Syntax/Tokens.h"
#include "clang/Tooling/Syntax/TokenBufferTokenManager.h"
using namespace clang;
/// Exposes private syntax tree APIs required to implement node synthesis.
/// Should not be used for anything else.
class clang::syntax::FactoryImpl {
public:
static void setCanModify(syntax::Node *N) { N->CanModify = true; }
static void prependChildLowLevel(syntax::Tree *T, syntax::Node *Child,
syntax::NodeRole R) {
T->prependChildLowLevel(Child, R);
}
static void appendChildLowLevel(syntax::Tree *T, syntax::Node *Child,
syntax::NodeRole R) {
T->appendChildLowLevel(Child, R);
}
static std::pair<FileID, ArrayRef<Token>>
lexBuffer(TokenBufferTokenManager &TBTM,
std::unique_ptr<llvm::MemoryBuffer> Buffer) {
return TBTM.lexBuffer(std::move(Buffer));
}
};
// FIXME: `createLeaf` is based on `syntax::tokenize` internally, as such it
// doesn't support digraphs or line continuations.
syntax::Leaf *clang::syntax::createLeaf(syntax::Arena &A,
TokenBufferTokenManager &TBTM,
tok::TokenKind K, StringRef Spelling) {
auto Tokens =
FactoryImpl::lexBuffer(TBTM, llvm::MemoryBuffer::getMemBufferCopy(Spelling))
.second;
assert(Tokens.size() == 1);
assert(Tokens.front().kind() == K &&
"spelling is not lexed into the expected kind of token");
auto *Leaf = new (A.getAllocator()) syntax::Leaf(
reinterpret_cast<TokenManager::Key>(Tokens.begin()));
syntax::FactoryImpl::setCanModify(Leaf);
Leaf->assertInvariants();
return Leaf;
}
syntax::Leaf *clang::syntax::createLeaf(syntax::Arena &A,
TokenBufferTokenManager &TBTM,
tok::TokenKind K) {
const auto *Spelling = tok::getPunctuatorSpelling(K);
if (!Spelling)
Spelling = tok::getKeywordSpelling(K);
assert(Spelling &&
"Cannot infer the spelling of the token from its token kind.");
return createLeaf(A, TBTM, K, Spelling);
}
namespace {
// Allocates the concrete syntax `Tree` according to its `NodeKind`.
syntax::Tree *allocateTree(syntax::Arena &A, syntax::NodeKind Kind) {
switch (Kind) {
case syntax::NodeKind::Leaf:
assert(false);
break;
case syntax::NodeKind::TranslationUnit:
return new (A.getAllocator()) syntax::TranslationUnit;
case syntax::NodeKind::UnknownExpression:
return new (A.getAllocator()) syntax::UnknownExpression;
case syntax::NodeKind::ParenExpression:
return new (A.getAllocator()) syntax::ParenExpression;
case syntax::NodeKind::ThisExpression:
return new (A.getAllocator()) syntax::ThisExpression;
case syntax::NodeKind::IntegerLiteralExpression:
return new (A.getAllocator()) syntax::IntegerLiteralExpression;
case syntax::NodeKind::CharacterLiteralExpression:
return new (A.getAllocator()) syntax::CharacterLiteralExpression;
case syntax::NodeKind::FloatingLiteralExpression:
return new (A.getAllocator()) syntax::FloatingLiteralExpression;
case syntax::NodeKind::StringLiteralExpression:
return new (A.getAllocator()) syntax::StringLiteralExpression;
case syntax::NodeKind::BoolLiteralExpression:
return new (A.getAllocator()) syntax::BoolLiteralExpression;
case syntax::NodeKind::CxxNullPtrExpression:
return new (A.getAllocator()) syntax::CxxNullPtrExpression;
case syntax::NodeKind::IntegerUserDefinedLiteralExpression:
return new (A.getAllocator()) syntax::IntegerUserDefinedLiteralExpression;
case syntax::NodeKind::FloatUserDefinedLiteralExpression:
return new (A.getAllocator()) syntax::FloatUserDefinedLiteralExpression;
case syntax::NodeKind::CharUserDefinedLiteralExpression:
return new (A.getAllocator()) syntax::CharUserDefinedLiteralExpression;
case syntax::NodeKind::StringUserDefinedLiteralExpression:
return new (A.getAllocator()) syntax::StringUserDefinedLiteralExpression;
case syntax::NodeKind::PrefixUnaryOperatorExpression:
return new (A.getAllocator()) syntax::PrefixUnaryOperatorExpression;
case syntax::NodeKind::PostfixUnaryOperatorExpression:
return new (A.getAllocator()) syntax::PostfixUnaryOperatorExpression;
case syntax::NodeKind::BinaryOperatorExpression:
return new (A.getAllocator()) syntax::BinaryOperatorExpression;
case syntax::NodeKind::UnqualifiedId:
return new (A.getAllocator()) syntax::UnqualifiedId;
case syntax::NodeKind::IdExpression:
return new (A.getAllocator()) syntax::IdExpression;
case syntax::NodeKind::CallExpression:
return new (A.getAllocator()) syntax::CallExpression;
case syntax::NodeKind::UnknownStatement:
return new (A.getAllocator()) syntax::UnknownStatement;
case syntax::NodeKind::DeclarationStatement:
return new (A.getAllocator()) syntax::DeclarationStatement;
case syntax::NodeKind::EmptyStatement:
return new (A.getAllocator()) syntax::EmptyStatement;
case syntax::NodeKind::SwitchStatement:
return new (A.getAllocator()) syntax::SwitchStatement;
case syntax::NodeKind::CaseStatement:
return new (A.getAllocator()) syntax::CaseStatement;
case syntax::NodeKind::DefaultStatement:
return new (A.getAllocator()) syntax::DefaultStatement;
case syntax::NodeKind::IfStatement:
return new (A.getAllocator()) syntax::IfStatement;
case syntax::NodeKind::ForStatement:
return new (A.getAllocator()) syntax::ForStatement;
case syntax::NodeKind::WhileStatement:
return new (A.getAllocator()) syntax::WhileStatement;
case syntax::NodeKind::ContinueStatement:
return new (A.getAllocator()) syntax::ContinueStatement;
case syntax::NodeKind::BreakStatement:
return new (A.getAllocator()) syntax::BreakStatement;
case syntax::NodeKind::ReturnStatement:
return new (A.getAllocator()) syntax::ReturnStatement;
case syntax::NodeKind::RangeBasedForStatement:
return new (A.getAllocator()) syntax::RangeBasedForStatement;
case syntax::NodeKind::ExpressionStatement:
return new (A.getAllocator()) syntax::ExpressionStatement;
case syntax::NodeKind::CompoundStatement:
return new (A.getAllocator()) syntax::CompoundStatement;
case syntax::NodeKind::UnknownDeclaration:
return new (A.getAllocator()) syntax::UnknownDeclaration;
case syntax::NodeKind::EmptyDeclaration:
return new (A.getAllocator()) syntax::EmptyDeclaration;
case syntax::NodeKind::StaticAssertDeclaration:
return new (A.getAllocator()) syntax::StaticAssertDeclaration;
case syntax::NodeKind::LinkageSpecificationDeclaration:
return new (A.getAllocator()) syntax::LinkageSpecificationDeclaration;
case syntax::NodeKind::SimpleDeclaration:
return new (A.getAllocator()) syntax::SimpleDeclaration;
case syntax::NodeKind::TemplateDeclaration:
return new (A.getAllocator()) syntax::TemplateDeclaration;
case syntax::NodeKind::ExplicitTemplateInstantiation:
return new (A.getAllocator()) syntax::ExplicitTemplateInstantiation;
case syntax::NodeKind::NamespaceDefinition:
return new (A.getAllocator()) syntax::NamespaceDefinition;
case syntax::NodeKind::NamespaceAliasDefinition:
return new (A.getAllocator()) syntax::NamespaceAliasDefinition;
case syntax::NodeKind::UsingNamespaceDirective:
return new (A.getAllocator()) syntax::UsingNamespaceDirective;
case syntax::NodeKind::UsingDeclaration:
return new (A.getAllocator()) syntax::UsingDeclaration;
case syntax::NodeKind::TypeAliasDeclaration:
return new (A.getAllocator()) syntax::TypeAliasDeclaration;
case syntax::NodeKind::SimpleDeclarator:
return new (A.getAllocator()) syntax::SimpleDeclarator;
case syntax::NodeKind::ParenDeclarator:
return new (A.getAllocator()) syntax::ParenDeclarator;
case syntax::NodeKind::ArraySubscript:
return new (A.getAllocator()) syntax::ArraySubscript;
case syntax::NodeKind::TrailingReturnType:
return new (A.getAllocator()) syntax::TrailingReturnType;
case syntax::NodeKind::ParametersAndQualifiers:
return new (A.getAllocator()) syntax::ParametersAndQualifiers;
case syntax::NodeKind::MemberPointer:
return new (A.getAllocator()) syntax::MemberPointer;
case syntax::NodeKind::GlobalNameSpecifier:
return new (A.getAllocator()) syntax::GlobalNameSpecifier;
case syntax::NodeKind::DecltypeNameSpecifier:
return new (A.getAllocator()) syntax::DecltypeNameSpecifier;
case syntax::NodeKind::IdentifierNameSpecifier:
return new (A.getAllocator()) syntax::IdentifierNameSpecifier;
case syntax::NodeKind::SimpleTemplateNameSpecifier:
return new (A.getAllocator()) syntax::SimpleTemplateNameSpecifier;
case syntax::NodeKind::NestedNameSpecifier:
return new (A.getAllocator()) syntax::NestedNameSpecifier;
case syntax::NodeKind::MemberExpression:
return new (A.getAllocator()) syntax::MemberExpression;
case syntax::NodeKind::CallArguments:
return new (A.getAllocator()) syntax::CallArguments;
case syntax::NodeKind::ParameterDeclarationList:
return new (A.getAllocator()) syntax::ParameterDeclarationList;
case syntax::NodeKind::DeclaratorList:
return new (A.getAllocator()) syntax::DeclaratorList;
}
llvm_unreachable("unknown node kind");
}
} // namespace
syntax::Tree *clang::syntax::createTree(
syntax::Arena &A,
ArrayRef<std::pair<syntax::Node *, syntax::NodeRole>> Children,
syntax::NodeKind K) {
auto *T = allocateTree(A, K);
FactoryImpl::setCanModify(T);
for (const auto &Child : Children)
FactoryImpl::appendChildLowLevel(T, Child.first, Child.second);
T->assertInvariants();
return T;
}
syntax::Node *clang::syntax::deepCopyExpandingMacros(syntax::Arena &A,
TokenBufferTokenManager &TBTM,
const syntax::Node *N) {
if (const auto *L = dyn_cast<syntax::Leaf>(N))
// `L->getToken()` gives us the expanded token, thus we implicitly expand
// any macros here.
return createLeaf(A, TBTM, TBTM.getToken(L->getTokenKey())->kind(),
TBTM.getText(L->getTokenKey()));
const auto *T = cast<syntax::Tree>(N);
std::vector<std::pair<syntax::Node *, syntax::NodeRole>> Children;
for (const auto *Child = T->getFirstChild(); Child;
Child = Child->getNextSibling())
Children.push_back({deepCopyExpandingMacros(A, TBTM, Child), Child->getRole()});
return createTree(A, Children, N->getKind());
}
syntax::EmptyStatement *clang::syntax::createEmptyStatement(syntax::Arena &A, TokenBufferTokenManager &TBTM) {
return cast<EmptyStatement>(
createTree(A, {{createLeaf(A, TBTM, tok::semi), NodeRole::Unknown}},
NodeKind::EmptyStatement));
}
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