johannes updated this revision to Diff 108370.
johannes retitled this revision from "[clang-diff] improve mapping accuracy,
HTML side-by-side diff." to "[clang-diff] improve mapping accuracy".
https://reviews.llvm.org/D34748
Files:
include/clang/Tooling/ASTDiff/ASTDiff.h
include/clang/Tooling/ASTDiff/ASTDiffInternal.h
lib/Tooling/ASTDiff/ASTDiff.cpp
test/Tooling/clang-diff-basic.cpp
tools/clang-diff/CMakeLists.txt
tools/clang-diff/ClangDiff.cpp
Index: tools/clang-diff/ClangDiff.cpp
===================================================================
--- tools/clang-diff/ClangDiff.cpp
+++ tools/clang-diff/ClangDiff.cpp
@@ -13,6 +13,7 @@
//===----------------------------------------------------------------------===//
#include "clang/Tooling/ASTDiff/ASTDiff.h"
+#include "clang/Tooling/ArgumentsAdjusters.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/Support/CommandLine.h"
@@ -24,15 +25,13 @@
static cl::OptionCategory ClangDiffCategory("clang-diff options");
static cl::opt<bool>
- DumpAST("ast-dump",
+ ASTDump("ast-dump",
cl::desc("Print the internal representation of the AST as JSON."),
cl::init(false), cl::cat(ClangDiffCategory));
-static cl::opt<bool> NoCompilationDatabase(
- "no-compilation-database",
- cl::desc(
- "Do not attempt to load build settings from a compilation database"),
- cl::init(false), cl::cat(ClangDiffCategory));
+static cl::opt<bool>
+ PrintMatches("m", cl::desc("Print the matched nodes (verbose)."),
+ cl::init(false), cl::cat(ClangDiffCategory));
static cl::opt<std::string> SourcePath(cl::Positional, cl::desc("<source>"),
cl::Required,
@@ -43,12 +42,69 @@
cl::Optional,
cl::cat(ClangDiffCategory));
+static cl::opt<bool> NoCompilationDatabase(
+ "no-compilation-database",
+ cl::desc(
+ "Do not attempt to load build settings from a compilation database"),
+ cl::init(false), cl::cat(ClangDiffCategory));
+
+static cl::opt<std::string> BuildPath("p", cl::desc("Build path"), cl::Optional,
+ cl::cat(ClangDiffCategory));
+
+static cl::list<std::string> ArgsAfter(
+ "extra-arg",
+ cl::desc("Additional argument to append to the compiler command line"),
+ cl::cat(ClangDiffCategory));
+
+static cl::list<std::string> ArgsBefore(
+ "extra-arg-before",
+ cl::desc("Additional argument to prepend to the compiler command line"),
+ cl::cat(ClangDiffCategory));
+
+namespace {
+class ArgumentsAdjustingCompilations : public CompilationDatabase {
+public:
+ ArgumentsAdjustingCompilations(
+ std::unique_ptr<CompilationDatabase> Compilations)
+ : Compilations(std::move(Compilations)) {}
+
+ void appendArgumentsAdjuster(ArgumentsAdjuster Adjuster) {
+ Adjusters.push_back(std::move(Adjuster));
+ }
+
+ std::vector<CompileCommand>
+ getCompileCommands(StringRef FilePath) const override {
+ return adjustCommands(Compilations->getCompileCommands(FilePath));
+ }
+
+ std::vector<std::string> getAllFiles() const override {
+ return Compilations->getAllFiles();
+ }
+
+ std::vector<CompileCommand> getAllCompileCommands() const override {
+ return adjustCommands(Compilations->getAllCompileCommands());
+ }
+
+private:
+ std::unique_ptr<CompilationDatabase> Compilations;
+ std::vector<ArgumentsAdjuster> Adjusters;
+
+ std::vector<CompileCommand>
+ adjustCommands(std::vector<CompileCommand> Commands) const {
+ for (CompileCommand &Command : Commands)
+ for (const auto &Adjuster : Adjusters)
+ Command.CommandLine = Adjuster(Command.CommandLine, Command.Filename);
+ return Commands;
+ }
+};
+} // end anonymous namespace
+
static std::unique_ptr<ASTUnit> getAST(const StringRef Filename) {
std::string ErrorMessage;
std::unique_ptr<CompilationDatabase> Compilations;
if (!NoCompilationDatabase)
- Compilations =
- CompilationDatabase::autoDetectFromSource(Filename, ErrorMessage);
+ Compilations = CompilationDatabase::autoDetectFromSource(
+ BuildPath.empty() ? Filename : BuildPath, ErrorMessage);
if (!Compilations) {
if (!NoCompilationDatabase)
llvm::errs()
@@ -58,6 +114,14 @@
Compilations = llvm::make_unique<clang::tooling::FixedCompilationDatabase>(
".", std::vector<std::string>());
}
+ auto AdjustingCompilations =
+ llvm::make_unique<ArgumentsAdjustingCompilations>(
+ std::move(Compilations));
+ AdjustingCompilations->appendArgumentsAdjuster(
+ getInsertArgumentAdjuster(ArgsBefore, ArgumentInsertPosition::BEGIN));
+ AdjustingCompilations->appendArgumentsAdjuster(
+ getInsertArgumentAdjuster(ArgsAfter, ArgumentInsertPosition::END));
+ Compilations = std::move(AdjustingCompilations);
std::array<std::string, 1> Files = {{Filename}};
ClangTool Tool(*Compilations, Files);
std::vector<std::unique_ptr<ASTUnit>> ASTs;
@@ -67,23 +131,143 @@
return std::move(ASTs[0]);
}
+static char hexdigit(int N) { return N &= 0xf, N + (N < 10 ? '0' : 'a' - 10); }
+
+static void printJsonString(raw_ostream &OS, const StringRef Str) {
+ for (char C : Str) {
+ switch (C) {
+ case '"':
+ OS << R"(\")";
+ break;
+ case '\\':
+ OS << R"(\\)";
+ break;
+ case '\n':
+ OS << R"(\n)";
+ break;
+ case '\t':
+ OS << R"(\t)";
+ break;
+ default:
+ if ('\x00' <= C && C <= '\x1f') {
+ OS << R"(\u00)" << hexdigit(C >> 4) << hexdigit(C);
+ } else {
+ OS << C;
+ }
+ }
+ }
+}
+
+static void printNodeAttributes(raw_ostream &OS, diff::SyntaxTree &Tree,
+ diff::NodeId Id) {
+ const diff::Node &N = Tree.getNode(Id);
+ OS << R"("id":)" << int(Id);
+ OS << R"(,"type":")" << N.getTypeLabel() << '"';
+ auto Offsets = Tree.getFileOffsets(N);
+ OS << R"(,"begin":)" << Offsets.first;
+ OS << R"(,"end":)" << Offsets.second;
+ std::string Value = Tree.getNodeValue(N);
+ if (!Value.empty()) {
+ OS << R"(,"value":")";
+ printJsonString(OS, Value);
+ OS << '"';
+ }
+}
+
+static void printNodeAsJson(raw_ostream &OS, diff::SyntaxTree &Tree,
+ diff::NodeId Id) {
+ const diff::Node &N = Tree.getNode(Id);
+ OS << "{";
+ printNodeAttributes(OS, Tree, Id);
+ auto Identifier = N.getIdentifier();
+ auto QualifiedIdentifier = N.getQualifiedIdentifier();
+ if (Identifier) {
+ OS << R"(,"identifier":")";
+ printJsonString(OS, *Identifier);
+ OS << R"(")";
+ if (QualifiedIdentifier && *Identifier != *QualifiedIdentifier) {
+ OS << R"(,"qualified_identifier":")";
+ printJsonString(OS, *QualifiedIdentifier);
+ OS << R"(")";
+ }
+ }
+ OS << R"(,"children":[)";
+ if (N.Children.size() > 0) {
+ printNodeAsJson(OS, Tree, N.Children[0]);
+ for (size_t I = 1, E = N.Children.size(); I < E; ++I) {
+ OS << ",";
+ printNodeAsJson(OS, Tree, N.Children[I]);
+ }
+ }
+ OS << "]}";
+}
+
+static void printNode(raw_ostream &OS, diff::SyntaxTree &Tree,
+ diff::NodeId Id) {
+ if (Id.isInvalid()) {
+ OS << "None";
+ return;
+ }
+ OS << Tree.getNode(Id).getTypeLabel();
+ std::string Value = Tree.getNodeValue(Id);
+ if (!Value.empty())
+ OS << ": " << Value;
+ OS << "(" << Id << ")";
+}
+
+static void printDstChange(raw_ostream &OS, diff::ASTDiff &Diff,
+ diff::NodeId Dst) {
+ const diff::Node &DstNode = Diff.DstTree.getNode(Dst);
+ diff::NodeId Src = Diff.getMapped(Diff.DstTree, Dst);
+ switch (DstNode.ChangeKind) {
+ case diff::None:
+ case diff::Delete:
+ break;
+ case diff::Update:
+ OS << "Update ";
+ printNode(OS, Diff.SrcTree, Src);
+ OS << " to " << Diff.DstTree.getNodeValue(Dst) << "\n";
+ break;
+ case diff::Insert:
+ case diff::Move:
+ case diff::UpdateMove:
+ if (DstNode.ChangeKind == diff::Insert)
+ OS << "Insert";
+ else if (DstNode.ChangeKind == diff::Move)
+ OS << "Move";
+ else if (DstNode.ChangeKind == diff::UpdateMove)
+ OS << "Update and Move";
+ OS << " ";
+ printNode(OS, Diff.DstTree, Dst);
+ OS << " into ";
+ printNode(OS, Diff.DstTree, DstNode.Parent);
+ OS << " at " << Diff.DstTree.findPositionInParent(Dst) << "\n";
+ break;
+ }
+}
+
int main(int argc, const char **argv) {
cl::HideUnrelatedOptions(ClangDiffCategory);
if (!cl::ParseCommandLineOptions(argc, argv)) {
cl::PrintOptionValues();
return 1;
}
- if (DumpAST) {
+ if (ASTDump) {
if (!DestinationPath.empty()) {
llvm::errs() << "Error: Please specify exactly one filename.\n";
return 1;
}
std::unique_ptr<ASTUnit> AST = getAST(SourcePath);
if (!AST)
return 1;
diff::SyntaxTree Tree(AST->getASTContext());
- Tree.printAsJson(llvm::outs());
+ llvm::outs() << R"({"filename":")";
+ printJsonString(llvm::outs(), Tree.getFilename());
+ llvm::outs() << R"(","root":)";
+ printNodeAsJson(llvm::outs(), Tree, Tree.getRootId());
+ llvm::outs() << "}\n";
+
return 0;
}
@@ -100,11 +284,25 @@
diff::ComparisonOptions Options;
diff::SyntaxTree SrcTree(Src->getASTContext());
diff::SyntaxTree DstTree(Dst->getASTContext());
- diff::ASTDiff DiffTool(SrcTree, DstTree, Options);
- for (const auto &Match : DiffTool.getMatches())
- DiffTool.printMatch(llvm::outs(), Match);
- for (const auto &Change : DiffTool.getChanges())
- DiffTool.printChange(llvm::outs(), Change);
+ diff::ASTDiff Diff(SrcTree, DstTree, Options);
+ for (diff::NodeId Dst : DstTree) {
+ diff::NodeId Src = Diff.getMapped(DstTree, Dst);
+ if (PrintMatches && Src.isValid()) {
+ llvm::outs() << "Match ";
+ printNode(llvm::outs(), SrcTree, Src);
+ llvm::outs() << " to ";
+ printNode(llvm::outs(), DstTree, Dst);
+ llvm::outs() << "\n";
+ }
+ printDstChange(llvm::outs(), Diff, Dst);
+ }
+ for (diff::NodeId Src : SrcTree) {
+ if (Diff.getMapped(SrcTree, Src).isInvalid()) {
+ llvm::outs() << "Delete ";
+ printNode(llvm::outs(), SrcTree, Src);
+ llvm::outs() << "\n";
+ }
+ }
return 0;
}
Index: tools/clang-diff/CMakeLists.txt
===================================================================
--- tools/clang-diff/CMakeLists.txt
+++ tools/clang-diff/CMakeLists.txt
@@ -7,6 +7,7 @@
)
target_link_libraries(clang-diff
+ clangBasic
clangFrontend
clangTooling
clangToolingASTDiff
Index: test/Tooling/clang-diff-basic.cpp
===================================================================
--- test/Tooling/clang-diff-basic.cpp
+++ test/Tooling/clang-diff-basic.cpp
@@ -1,66 +1,145 @@
// RUN: %clang_cc1 -E %s > %T/src.cpp
// RUN: %clang_cc1 -E %s > %T/dst.cpp -DDEST
-// RUN: clang-diff -no-compilation-database %T/src.cpp %T/dst.cpp | FileCheck %s
+// RUN: clang-diff -no-compilation-database -m %T/src.cpp %T/dst.cpp | FileCheck %s
#ifndef DEST
namespace src {
-void foo() {
- int x = 321;
-}
+void foo() { int x = 321; }
-void main() { foo(); };
+void main() {
+ foo();
+ {{;;;;;;;;;;;;;;;}}
+};
+
+int f() { return 1 * 2 * 3 * 4; }
const char *a = "foo";
typedef unsigned int nat;
+void fun() { f(); }
+
+namespace inner {
+void qfun() { f(); }
+}
+
+bool match = true;
+
int p = 1 * 2 * 3 * 4;
int squared = p * p;
+} // end namespace src
+
+class Base {};
+
+class X : Base {
+ int a;
+ X(int a) {}
+
+ void testMemberRef() {
+ (void) a;
+ (void) a;
+ (void) a;
+ }
-class X {
const char *foo(int i) {
if (i == 0)
return "foo";
return 0;
}
public:
- X(){};
+ X() {}
int id(int i) { return i; }
};
-}
+
+int x() { return 2; }
+namespace other { int x(); }
+
+namespace refs1 {
+ int x() { return 1;;;; }
+
+ int X1 = x();
+ int X2 = x();
+ int X3 = x();
+} // end namespace refs1
+
+
#else
+
// CHECK: Match TranslationUnitDecl{{.*}} to TranslationUnitDecl
-// CHECK: Match NamespaceDecl: src{{.*}} to NamespaceDecl: dst
+// CHECK: Match NamespaceDecl: ::src{{.*}} to NamespaceDecl: ::dst
namespace dst {
-// CHECK-NOT: Match NamespaceDecl: src{{.*}} to NamespaceDecl: inner
+// CHECK-NOT: Match NamespaceDecl: ::src{{.*}} to NamespaceDecl: inner
namespace inner {
void foo() {
// CHECK: Match IntegerLiteral: 321{{.*}} to IntegerLiteral: 322
int x = 322;
}
-}
+void qfun();
+} // end namespace inner
// CHECK: Match DeclRefExpr: foo{{.*}} to DeclRefExpr: inner::foo
-void main() { inner::foo(); }
+void main() {
+ inner::foo();
+ // Create some common descendants, so that the namespaces are matched.
+ {{;;;;;;;;;;;;;;;}}
+}
+
+// CHECK-NOT: Match FunctionDecl: f{{.*}} to FunctionDecl: f(
+int f() { return 3 * 4; }
+// CHECK: Match FunctionDecl: f{{.*}} to FunctionDecl: f1(
+// CHECK: Match ReturnStmt
+int f1() { return 1 * 2 * 3 * 4; }
+int f2() { return 1 * 2 * 3 * 4; }
// CHECK: Match StringLiteral: foo{{.*}} to StringLiteral: foo
const char *b = "f" "o" "o";
// unsigned is canonicalized to unsigned int
// CHECK: Match TypedefDecl: nat;unsigned int;{{.*}} to TypedefDecl: nat;unsigned int;
typedef unsigned nat;
+// match functions with the same name + same parent, even if there is no other
+// similarity
+// CHECK: Match FunctionDecl: fun{{.*}} to FunctionDecl: fun
+void fun() { b = ""; }
+
+// also without the same parent if their qualified names are identical
+void inner::qfun() { b = ""; }
+
+// CHECK: Match CXXBoolLiteralExpr: true{{.*}} to CXXBoolLiteralExpr: false
+bool match = false;
+
// CHECK: Match VarDecl: p(int){{.*}} to VarDecl: prod(double)
-// CHECK: Match BinaryOperator: *{{.*}} to BinaryOperator: *
// CHECK: Update VarDecl: p(int){{.*}} to prod(double)
+// CHECK-NOT: Match ImplicitCastExpr
+// CHECK: Match BinaryOperator: *{{.*}} to BinaryOperator: *
double prod = 1 * 2 * 10;
// CHECK: Update DeclRefExpr
int squared = prod * prod;
+} // end namespace dst
+
+class Base {};
+
+class X : Base {
+ // CHECK: Update CXXConstructorDecl: X(void (int)){{.*}} to X(void (int))Base,a,s,
+ // Insert DeclRefExpr: a{{.*}} into CXXConstructorDecl: X(void (int))a,s,{{.*}} at 1
+ // Insert IntegerLiteral: 4{{.*}} into CXXConstructorDecl: X(void (int))a,s,{{.*}} at 2
+ X(int a) : Base(), a(a), s(4) {}
+ int a, s;
+
+ void testMemberRef() {
+ // Superfluous qualification does not make a difference.
+ // CHECK: Match MemberExpr: a{{.*}} to MemberExpr: a
+ // CHECK-NOT: Update MemberExpr: a{{.*}}
+ (void) this->a;
+ // CHECK: Match MemberExpr: a{{.*}} to MemberExpr: a
+ // CHECK-NOT: Update MemberExpr: a{{.*}}
+ (void) X::a;
+ }
-class X {
const char *foo(int i) {
if (i == 0)
return "Bar";
@@ -70,9 +149,27 @@
return "foo";
return 0;
}
- // CHECK: Delete AccessSpecDecl: public
- X(){};
- // CHECK: Delete CXXMethodDecl
+ X() {}
};
-}
+
+int x() { return 2; }
+namespace other { int x(); }
+
+namespace refs2 {
+ int x() { return 1;;;; }
+
+ // CHECK: Match DeclRefExpr: x{{.*}} to DeclRefExpr: x
+ // No update even though the qualified name changed, because the relative
+ // name (x) is still the same.
+ // CHECK-NOT: Update DeclRefExpr: x
+ int X1 = x();
+ // CHECK: Match DeclRefExpr: x{{.*}} to DeclRefExpr: ::x
+ int X2 = ::x();
+ // CHECK: Match DeclRefExpr: x{{.*}} to DeclRefExpr: ::other::x
+ int X3 = other::x();
+} // end namespace refs2
+
+// CHECK: Delete AccessSpecDecl: public
+// CHECK: Delete CXXMethodDecl
+
#endif
Index: lib/Tooling/ASTDiff/ASTDiff.cpp
===================================================================
--- lib/Tooling/ASTDiff/ASTDiff.cpp
+++ lib/Tooling/ASTDiff/ASTDiff.cpp
@@ -27,84 +27,174 @@
namespace clang {
namespace diff {
+/// Maps nodes of the left tree to ones on the right, and vice versa.
+class Mapping {
+public:
+ Mapping() = default;
+ Mapping(Mapping &&Other) = default;
+ Mapping &operator=(Mapping &&Other) = default;
+ Mapping(size_t Size);
+
+ void link(NodeId Src, NodeId Dst);
+
+ NodeId getDst(NodeId Src) const;
+ NodeId getSrc(NodeId Dst) const;
+ bool hasSrc(NodeId Src) const;
+ bool hasDst(NodeId Dst) const;
+
+private:
+ std::unique_ptr<NodeId[]> SrcToDst, DstToSrc;
+};
+
class ASTDiff::Impl {
public:
- SyntaxTreeImpl &T1, &T2;
- bool IsMappingDone = false;
+ SyntaxTree::Impl &T1, &T2;
Mapping TheMapping;
- Impl(SyntaxTreeImpl &T1, SyntaxTreeImpl &T2, const ComparisonOptions &Options)
+ Impl(SyntaxTree::Impl &T1, SyntaxTree::Impl &T2,
+ const ComparisonOptions &Options)
: T1(T1), T2(T2), Options(Options) {}
- /// Matches nodes one-by-one based on their similarity.
+ // Matches nodes one-by-one based on their similarity.
void computeMapping();
- std::vector<Match> getMatches(Mapping &M);
-
- /// Finds an edit script that converts T1 to T2.
- std::vector<Change> computeChanges(Mapping &M);
-
- void printChangeImpl(raw_ostream &OS, const Change &Chg) const;
- void printMatchImpl(raw_ostream &OS, const Match &M) const;
+ // Compute ChangeKind for each node based on similarity.
+ void computeChangeKinds(Mapping &M);
- // Returns a mapping of isomorphic subtrees.
- Mapping matchTopDown() const;
+ NodeId getMapped(const SyntaxTree::Impl &Tree, NodeId Id) const {
+ if (&Tree == &T1)
+ return TheMapping.getDst(Id);
+ assert(&Tree == &T2 && "Invalid tree.");
+ return TheMapping.getSrc(Id);
+ }
private:
// Returns true if the two subtrees are identical.
- bool isomorphic(NodeId Id1, NodeId Id2) const;
+ bool identical(NodeId Id1, NodeId Id2);
- bool canBeAddedToMapping(const Mapping &M, NodeId Id1, NodeId Id2) const;
+ // Returns true if the nodes' parents are matched.
+ bool haveSameParents(const Mapping &M, NodeId Id1, NodeId Id2) const;
- // Returns false if the nodes must not be mached.
+ // Returns false if the nodes must not be matched.
bool isMatchingPossible(NodeId Id1, NodeId Id2) const;
- // Adds all corresponding subtrees of the two nodes to the mapping.
- // The two nodes must be isomorphic.
- void addIsomorphicSubTrees(Mapping &M, NodeId Id1, NodeId Id2) const;
-
// Uses an optimal albeit slow algorithm to compute a mapping between two
// subtrees, but only if both have fewer nodes than MaxSize.
void addOptimalMapping(Mapping &M, NodeId Id1, NodeId Id2) const;
- // Computes the ratio of common descendants between the two nodes.
- // Descendants are only considered to be equal when they are mapped in M.
- double getSimilarity(const Mapping &M, NodeId Id1, NodeId Id2) const;
+ double getSimilarity(const Mapping &M, NodeId Id1, NodeId Id2);
+ double getJaccardSimilarity(const Mapping &M, NodeId Id1, NodeId Id2) const;
// Returns the node that has the highest degree of similarity.
- NodeId findCandidate(const Mapping &M, NodeId Id1) const;
+ NodeId findCandidate(const Mapping &M, NodeId Id1, NodeId Subtree);
+ // Returns a mapping of identical subtrees.
+ Mapping matchTopDown();
// Tries to match any yet unmapped nodes, in a bottom-up fashion.
- void matchBottomUp(Mapping &M) const;
+ void matchBottomUp(Mapping &M);
+ // Matches nodes, whose parents are matched.
+ void matchChildren(Mapping &M);
const ComparisonOptions &Options;
friend class ZhangShashaMatcher;
};
+class SyntaxTree::Impl {
+public:
+ Impl(SyntaxTree *Parent, ASTContext &AST);
+ Impl(SyntaxTree *Parent, Decl *N, ASTContext &AST);
+ Impl(SyntaxTree *Parent, Stmt *N, ASTContext &AST);
+ template <class T>
+ Impl(SyntaxTree *Parent,
+ typename std::enable_if<std::is_base_of<Stmt, T>::value, T>::type *Node,
+ ASTContext &AST)
+ : SyntaxTree::Impl(Parent, dyn_cast<Stmt>(Node), AST) {}
+ template <class T>
+ Impl(SyntaxTree *Parent,
+ typename std::enable_if<std::is_base_of<Decl, T>::value, T>::type *Node,
+ ASTContext &AST)
+ : SyntaxTree::Impl(Parent, dyn_cast<Decl>(Node), AST) {}
+
+ SyntaxTree *Parent;
+ ASTContext &AST;
+ std::vector<NodeId> Leaves;
+ // Maps preorder indices to postorder ones.
+ std::vector<int> PostorderIds;
+ std::vector<NodeId> NodesBfs;
+
+ const StringRef getFilename() const;
+ int getSize() const { return Nodes.size(); }
+ NodeId getRootId() const { return 0; }
+ PreorderIterator begin() const { return getRootId(); }
+ PreorderIterator end() const { return getSize(); }
+
+ const Node &getNode(NodeId Id) const { return Nodes[Id]; }
+ Node &getMutableNode(NodeId Id) { return Nodes[Id]; }
+ // Returns the number of nodes in the subtree, including this one.
+ int getNumberOfDescendants(NodeId Id) const;
+ bool isDescendantOf(NodeId Child, NodeId Parent) const;
+ int findPositionInParent(NodeId Id, bool Shifted = false) const;
+
+ std::string getNodeValue(NodeId Id);
+ std::string getNodeValue(const DynTypedNode &DTN);
+ std::string getDeclValue(const Decl *D) const;
+ std::string getStmtValue(const Stmt *S);
+
+ struct SubtreeIterator {
+ NodeId Root, End;
+ SubtreeIterator(const SyntaxTree::Impl &Tree, NodeId Root)
+ : Root(Root), End(Tree.getNode(Root).RightMostDescendant + 1) {}
+ PreorderIterator begin() const { return Root; }
+ PreorderIterator end() const { return End; }
+ };
+
+ SubtreeIterator iteratePreorder(NodeId Root) const { return {*this, Root}; }
+
+private:
+ /// Nodes in preorder.
+ std::vector<Node> Nodes;
+
+ void initTree();
+ void setLeftMostDescendants();
+};
+
template <class T>
static bool isNodeExcluded(const SourceManager &SrcMgr, T *N) {
if (!N)
return true;
SourceLocation SLoc = N->getLocStart();
- return SLoc.isValid() && SrcMgr.isInSystemHeader(SLoc);
+ if (!SLoc.isValid())
+ return false;
+ // Ignore everything from other files.
+ if (!SrcMgr.isInMainFile(SLoc))
+ return true;
+ // Ignore macros.
+ if (N->getLocStart() != SrcMgr.getSpellingLoc(N->getLocStart()))
+ return true;
+ return false;
}
+static bool isDeclExcluded(const Decl *D) { return D->isImplicit(); }
+static bool isStmtExcluded(const Stmt *S) { return false; }
+
namespace {
/// Counts the number of nodes that will be compared.
struct NodeCountVisitor : public RecursiveASTVisitor<NodeCountVisitor> {
int Count = 0;
- const SyntaxTreeImpl &Root;
- NodeCountVisitor(const SyntaxTreeImpl &Root) : Root(Root) {}
+ const SyntaxTree::Impl &Tree;
+ NodeCountVisitor(const SyntaxTree::Impl &Tree) : Tree(Tree) {}
bool TraverseDecl(Decl *D) {
- if (isNodeExcluded(Root.AST.getSourceManager(), D))
+ if (isNodeExcluded(Tree.AST.getSourceManager(), D) || isDeclExcluded(D))
return true;
++Count;
RecursiveASTVisitor<NodeCountVisitor>::TraverseDecl(D);
return true;
}
bool TraverseStmt(Stmt *S) {
- if (isNodeExcluded(Root.AST.getSourceManager(), S))
+ if (S)
+ S = S->IgnoreImplicit();
+ if (isNodeExcluded(Tree.AST.getSourceManager(), S) || isStmtExcluded(S))
return true;
++Count;
RecursiveASTVisitor<NodeCountVisitor>::TraverseStmt(S);
@@ -119,51 +209,53 @@
struct PreorderVisitor : public RecursiveASTVisitor<PreorderVisitor> {
int Id = 0, Depth = 0;
NodeId Parent;
- SyntaxTreeImpl &Root;
+ SyntaxTree::Impl &Tree;
- PreorderVisitor(SyntaxTreeImpl &Root) : Root(Root) {}
+ PreorderVisitor(SyntaxTree::Impl &Tree) : Tree(Tree) {}
template <class T> std::tuple<NodeId, NodeId> PreTraverse(T *ASTNode) {
NodeId MyId = Id;
- Node &N = Root.getMutableNode(MyId);
+ Node &N = Tree.getMutableNode(MyId);
N.Parent = Parent;
N.Depth = Depth;
N.ASTNode = DynTypedNode::create(*ASTNode);
assert(!N.ASTNode.getNodeKind().isNone() &&
"Expected nodes to have a valid kind.");
if (Parent.isValid()) {
- Node &P = Root.getMutableNode(Parent);
+ Node &P = Tree.getMutableNode(Parent);
P.Children.push_back(MyId);
}
Parent = MyId;
++Id;
++Depth;
- return std::make_tuple(MyId, Root.getNode(MyId).Parent);
+ return std::make_tuple(MyId, Tree.getNode(MyId).Parent);
}
void PostTraverse(std::tuple<NodeId, NodeId> State) {
NodeId MyId, PreviousParent;
std::tie(MyId, PreviousParent) = State;
assert(MyId.isValid() && "Expecting to only traverse valid nodes.");
Parent = PreviousParent;
--Depth;
- Node &N = Root.getMutableNode(MyId);
- N.RightMostDescendant = Id;
+ Node &N = Tree.getMutableNode(MyId);
+ N.RightMostDescendant = Id - 1;
if (N.isLeaf())
- Root.Leaves.push_back(MyId);
+ Tree.Leaves.push_back(MyId);
N.Height = 1;
for (NodeId Child : N.Children)
- N.Height = std::max(N.Height, 1 + Root.getNode(Child).Height);
+ N.Height = std::max(N.Height, 1 + Tree.getNode(Child).Height);
}
bool TraverseDecl(Decl *D) {
- if (isNodeExcluded(Root.AST.getSourceManager(), D))
+ if (isNodeExcluded(Tree.AST.getSourceManager(), D) || isDeclExcluded(D))
return true;
auto SavedState = PreTraverse(D);
RecursiveASTVisitor<PreorderVisitor>::TraverseDecl(D);
PostTraverse(SavedState);
return true;
}
bool TraverseStmt(Stmt *S) {
- if (isNodeExcluded(Root.AST.getSourceManager(), S))
+ if (S)
+ S = S->IgnoreImplicit();
+ if (isNodeExcluded(Tree.AST.getSourceManager(), S) || isStmtExcluded(S))
return true;
auto SavedState = PreTraverse(S);
RecursiveASTVisitor<PreorderVisitor>::TraverseStmt(S);
@@ -174,11 +266,10 @@
};
} // end anonymous namespace
-SyntaxTreeImpl::SyntaxTreeImpl(SyntaxTree *Parent, const ASTContext &AST)
- : SyntaxTreeImpl(Parent, AST.getTranslationUnitDecl(), AST) {}
+SyntaxTree::Impl::Impl(SyntaxTree *Parent, ASTContext &AST)
+ : Impl(Parent, AST.getTranslationUnitDecl(), AST) {}
-SyntaxTreeImpl::SyntaxTreeImpl(SyntaxTree *Parent, Decl *N,
- const ASTContext &AST)
+SyntaxTree::Impl::Impl(SyntaxTree *Parent, Decl *N, ASTContext &AST)
: Parent(Parent), AST(AST) {
NodeCountVisitor NodeCounter(*this);
NodeCounter.TraverseDecl(N);
@@ -188,8 +279,7 @@
initTree();
}
-SyntaxTreeImpl::SyntaxTreeImpl(SyntaxTree *Parent, Stmt *N,
- const ASTContext &AST)
+SyntaxTree::Impl::Impl(SyntaxTree *Parent, Stmt *N, ASTContext &AST)
: Parent(Parent), AST(AST) {
NodeCountVisitor NodeCounter(*this);
NodeCounter.TraverseStmt(N);
@@ -199,7 +289,31 @@
initTree();
}
-void SyntaxTreeImpl::initTree() {
+static std::vector<NodeId> getSubtreePostorder(const SyntaxTree::Impl &Tree,
+ NodeId Root) {
+ std::vector<NodeId> Postorder;
+ std::function<void(NodeId)> Traverse = [&](NodeId Id) {
+ const Node &N = Tree.getNode(Id);
+ for (NodeId Child : N.Children)
+ Traverse(Child);
+ Postorder.push_back(Id);
+ };
+ Traverse(Root);
+ return Postorder;
+}
+
+static std::vector<NodeId> getSubtreeBfs(const SyntaxTree::Impl &Tree,
+ NodeId Root) {
+ std::vector<NodeId> Ids;
+ unsigned Expanded = 0;
+ Ids.push_back(Root);
+ while (Expanded < Ids.size())
+ for (NodeId Child : Tree.getNode(Ids[Expanded++]).Children)
+ Ids.push_back(Child);
+ return Ids;
+}
+
+void SyntaxTree::Impl::initTree() {
setLeftMostDescendants();
int PostorderId = 0;
PostorderIds.resize(getSize());
@@ -209,10 +323,11 @@
PostorderIds[Id] = PostorderId;
++PostorderId;
};
- PostorderTraverse(root());
+ PostorderTraverse(getRootId());
+ NodesBfs = getSubtreeBfs(*this, getRootId());
}
-void SyntaxTreeImpl::setLeftMostDescendants() {
+void SyntaxTree::Impl::setLeftMostDescendants() {
for (NodeId Leaf : Leaves) {
getMutableNode(Leaf).LeftMostDescendant = Leaf;
NodeId Parent, Cur = Leaf;
@@ -224,136 +339,140 @@
}
}
-static std::vector<NodeId> getSubtreePostorder(const SyntaxTreeImpl &Tree,
- NodeId Root) {
- std::vector<NodeId> Postorder;
- std::function<void(NodeId)> Traverse = [&](NodeId Id) {
- const Node &N = Tree.getNode(Id);
- for (NodeId Child : N.Children)
- Traverse(Child);
- Postorder.push_back(Id);
- };
- Traverse(Root);
- return Postorder;
+const StringRef SyntaxTree::Impl::getFilename() const {
+ SourceLocation RootLoc = getNode(getNode(getRootId()).LeftMostDescendant)
+ .ASTNode.getSourceRange()
+ .getBegin();
+ return AST.getSourceManager().getFilename(RootLoc);
}
-static std::vector<NodeId> getSubtreeBfs(const SyntaxTreeImpl &Tree,
- NodeId Root) {
- std::vector<NodeId> Ids;
- size_t Expanded = 0;
- Ids.push_back(Root);
- while (Expanded < Ids.size())
- for (NodeId Child : Tree.getNode(Ids[Expanded++]).Children)
- Ids.push_back(Child);
- return Ids;
+int SyntaxTree::Impl::getNumberOfDescendants(NodeId Id) const {
+ return getNode(Id).RightMostDescendant - Id + 1;
}
-int SyntaxTreeImpl::getNumberOfDescendants(NodeId Id) const {
- return getNode(Id).RightMostDescendant - Id + 1;
+bool SyntaxTree::Impl::isDescendantOf(NodeId Child, NodeId Parent) const {
+ return Child >= Parent && Child <= getNode(Parent).RightMostDescendant;
}
-bool SyntaxTreeImpl::isInSubtree(NodeId Id, NodeId SubtreeRoot) const {
- NodeId Lower = SubtreeRoot;
- NodeId Upper = getNode(SubtreeRoot).RightMostDescendant;
- return Id >= Lower && Id <= Upper;
+std::string SyntaxTree::Impl::getNodeValue(NodeId Id) {
+ return getNodeValue(getNode(Id).ASTNode);
}
-std::string SyntaxTreeImpl::getNodeValueImpl(NodeId Id) const {
- return getNodeValueImpl(getNode(Id).ASTNode);
+std::string SyntaxTree::Impl::getNodeValue(const DynTypedNode &DTN) {
+ if (auto *S = DTN.get<Stmt>())
+ return getStmtValue(S);
+ if (auto *D = DTN.get<Decl>())
+ return getDeclValue(D);
+ llvm_unreachable("Fatal: unhandled AST node.\n");
}
-std::string SyntaxTreeImpl::getNodeValueImpl(const DynTypedNode &DTN) const {
- if (auto *X = DTN.get<BinaryOperator>())
- return X->getOpcodeStr();
- if (auto *X = DTN.get<AccessSpecDecl>()) {
- CharSourceRange Range(X->getSourceRange(), false);
- return Lexer::getSourceText(Range, AST.getSourceManager(),
- AST.getLangOpts());
+static const DeclContext *getEnclosingDeclContext(ASTContext &AST,
+ const Stmt *S) {
+ while (S) {
+ const auto &Parents = AST.getParents(*S);
+ if (Parents.empty())
+ return nullptr;
+ const auto &P = Parents[0];
+ if (const auto *D = P.get<Decl>())
+ return D->getDeclContext();
+ S = P.get<Stmt>();
}
- if (auto *X = DTN.get<IntegerLiteral>()) {
- SmallString<256> Str;
- X->getValue().toString(Str, /*Radix=*/10, /*Signed=*/false);
- return Str.str();
- }
- if (auto *X = DTN.get<StringLiteral>())
- return X->getString();
- if (auto *X = DTN.get<ValueDecl>())
- return X->getNameAsString() + "(" + X->getType().getAsString() + ")";
- if (DTN.get<DeclStmt>() || DTN.get<TranslationUnitDecl>())
- return "";
- std::string Value;
- if (auto *X = DTN.get<DeclRefExpr>()) {
- if (X->hasQualifier()) {
- llvm::raw_string_ostream OS(Value);
- PrintingPolicy PP(AST.getLangOpts());
- X->getQualifier()->print(OS, PP);
- }
- Value += X->getDecl()->getNameAsString();
- return Value;
- }
- if (auto *X = DTN.get<NamedDecl>())
- Value += X->getNameAsString() + ";";
- if (auto *X = DTN.get<TypedefNameDecl>())
- return Value + X->getUnderlyingType().getAsString() + ";";
- if (DTN.get<NamespaceDecl>())
- return Value;
- if (auto *X = DTN.get<TypeDecl>())
- if (X->getTypeForDecl())
- Value +=
- X->getTypeForDecl()->getCanonicalTypeInternal().getAsString() + ";";
- if (DTN.get<Decl>())
- return Value;
- if (DTN.get<Stmt>())
- return "";
- llvm_unreachable("Fatal: unhandled AST node.\n");
+ llvm_unreachable("Could not find Decl ancestor.");
}
-void SyntaxTreeImpl::printTree() const { printTree(root()); }
-void SyntaxTreeImpl::printTree(NodeId Root) const {
- printTree(llvm::outs(), Root);
+// Returns the qualified name of ND. If the is declared in Context then
+// the name is made relative with respect to the qualified name of Context.
+static std::string getRelativeName(const NamedDecl *ND,
+ const DeclContext *Context) {
+ std::string ContextPrefix;
+ if (auto *Namespace = dyn_cast<NamespaceDecl>(Context)) {
+ ContextPrefix = Namespace->getQualifiedNameAsString();
+ } else if (auto *Tag = dyn_cast<TagDecl>(Context)) {
+ ContextPrefix = Tag->getQualifiedNameAsString();
+ }
+ std::string Val = ND->getQualifiedNameAsString();
+ // Strip the qualifier, including the final :: if Val refers to
+ // somthing in the current scope.
+ if (!ContextPrefix.empty() &&
+ Val.substr(0, ContextPrefix.size()) == ContextPrefix)
+ Val = Val.substr(ContextPrefix.size() + 2);
+ else
+ // Otherwise, prepend a double colon to the qualified name
+ // to avoid collision with a relative name.
+ // e.g.
+ // namespace n { int x; int local = x, global = ::x; }
+ // local will have the value "x" because the prefix is stripped as above
+ // global has the qualified name "x", therefore we prepend "::" to make it
+ // unambiguous.
+ Val = "::" + Val;
+ return Val;
}
-void SyntaxTreeImpl::printTree(raw_ostream &OS, NodeId Root) const {
- const Node &N = getNode(Root);
- for (int I = 0; I < N.Depth; ++I)
- OS << " ";
- printNode(OS, Root);
- OS << "\n";
- for (NodeId Child : N.Children)
- printTree(OS, Child);
+static std::string getRelativeName(const NamedDecl *ND) {
+ return getRelativeName(ND, ND->getDeclContext());
}
-void SyntaxTreeImpl::printNode(raw_ostream &OS, NodeId Id) const {
- if (Id.isInvalid()) {
- OS << "None";
- return;
- }
- OS << getNode(Id).getTypeLabel();
- if (getNodeValueImpl(Id) != "")
- OS << ": " << getNodeValueImpl(Id);
- OS << "(" << PostorderIds[Id] << ")";
-}
-
-void SyntaxTreeImpl::printNodeAsJson(raw_ostream &OS, NodeId Id) const {
- auto N = getNode(Id);
- OS << R"({"type":")" << N.getTypeLabel() << R"(")";
- if (getNodeValueImpl(Id) != "")
- OS << R"(,"value":")" << getNodeValueImpl(Id) << R"(")";
- OS << R"(,"children":[)";
- if (N.Children.size() > 0) {
- printNodeAsJson(OS, N.Children[0]);
- for (size_t I = 1, E = N.Children.size(); I < E; ++I) {
- OS << ",";
- printNodeAsJson(OS, N.Children[I]);
+std::string SyntaxTree::Impl::getDeclValue(const Decl *D) const {
+ std::string Value;
+ PrintingPolicy TypePP(AST.getLangOpts());
+ TypePP.AnonymousTagLocations = false;
+
+ if (auto *X = dyn_cast<ValueDecl>(D)) {
+ Value += getRelativeName(X) + "(" + X->getType().getAsString(TypePP) + ")";
+ if (auto *X = dyn_cast<CXXConstructorDecl>(D)) {
+ for (auto *Init : X->inits()) {
+ if (!Init->isWritten())
+ continue;
+ if (Init->isBaseInitializer()) {
+ Value += Init->getBaseClass()->getCanonicalTypeInternal().getAsString(
+ TypePP) +
+ ",";
+ } else {
+ assert(Init->isAnyMemberInitializer());
+ Value += getRelativeName(Init->getMember()) + ",";
+ }
+ }
}
+ return Value;
}
- OS << "]}";
+ if (auto *X = dyn_cast<NamedDecl>(D))
+ Value += getRelativeName(X) + ";";
+ if (auto *X = dyn_cast<TypedefNameDecl>(D))
+ return Value + X->getUnderlyingType().getAsString(TypePP) + ";";
+ if (auto *X = dyn_cast<TypeDecl>(D))
+ if (X->getTypeForDecl())
+ Value +=
+ X->getTypeForDecl()->getCanonicalTypeInternal().getAsString(TypePP) +
+ ";";
+ if (auto *X = dyn_cast<UsingDirectiveDecl>(D))
+ return X->getNominatedNamespace()->getName();
+ if (auto *X = dyn_cast<AccessSpecDecl>(D)) {
+ CharSourceRange Range(X->getSourceRange(), false);
+ return Lexer::getSourceText(Range, AST.getSourceManager(),
+ AST.getLangOpts());
+ }
+ return Value;
}
-void SyntaxTreeImpl::printAsJsonImpl(raw_ostream &OS) const {
- OS << R"({"root":)";
- printNodeAsJson(OS, root());
- OS << "}\n";
+std::string SyntaxTree::Impl::getStmtValue(const Stmt *S) {
+ if (auto *X = dyn_cast<UnaryOperator>(S))
+ return UnaryOperator::getOpcodeStr(X->getOpcode());
+ if (auto *X = dyn_cast<BinaryOperator>(S))
+ return X->getOpcodeStr();
+ if (auto *X = dyn_cast<MemberExpr>(S))
+ return getRelativeName(X->getMemberDecl());
+ if (auto *X = dyn_cast<IntegerLiteral>(S)) {
+ SmallString<256> Str;
+ X->getValue().toString(Str, /*Radix=*/10, /*Signed=*/false);
+ return Str.str();
+ }
+ if (auto *X = dyn_cast<DeclRefExpr>(S))
+ return getRelativeName(X->getDecl(), getEnclosingDeclContext(AST, S));
+ if (auto *X = dyn_cast<StringLiteral>(S))
+ return X->getString();
+ if (auto *X = dyn_cast<CXXBoolLiteralExpr>(S))
+ return X->getValue() ? "true" : "false";
+ return "";
}
/// Identifies a node in a subtree by its postorder offset, starting at 1.
@@ -372,16 +491,16 @@
class Subtree {
private:
/// The parent tree.
- const SyntaxTreeImpl &Tree;
+ SyntaxTree::Impl &Tree;
/// Maps SNodeIds to original ids.
std::vector<NodeId> RootIds;
/// Maps subtree nodes to their leftmost descendants wtihin the subtree.
std::vector<SNodeId> LeftMostDescendants;
public:
std::vector<SNodeId> KeyRoots;
- Subtree(const SyntaxTreeImpl &Tree, NodeId SubtreeRoot) : Tree(Tree) {
+ Subtree(SyntaxTree::Impl &Tree, NodeId SubtreeRoot) : Tree(Tree) {
RootIds = getSubtreePostorder(Tree, SubtreeRoot);
int NumLeaves = setLeftMostDescendants();
computeKeyRoots(NumLeaves);
@@ -394,6 +513,9 @@
const Node &getNode(SNodeId Id) const {
return Tree.getNode(getIdInRoot(Id));
}
+ std::string getNodeValue(SNodeId Id) {
+ return Tree.getNodeValue(getIdInRoot(Id));
+ }
SNodeId getLeftMostDescendant(SNodeId Id) const {
assert(Id > 0 && Id <= getSize() && "Invalid subtree node index.");
return LeftMostDescendants[Id - 1];
@@ -446,8 +568,8 @@
std::unique_ptr<std::unique_ptr<double[]>[]> TreeDist, ForestDist;
public:
- ZhangShashaMatcher(const ASTDiff::Impl &DiffImpl, const SyntaxTreeImpl &T1,
- const SyntaxTreeImpl &T2, NodeId Id1, NodeId Id2)
+ ZhangShashaMatcher(const ASTDiff::Impl &DiffImpl, SyntaxTree::Impl &T1,
+ SyntaxTree::Impl &T2, NodeId Id1, NodeId Id2)
: DiffImpl(DiffImpl), S1(T1, Id1), S2(T2, Id2) {
TreeDist = llvm::make_unique<std::unique_ptr<double[]>[]>(
size_t(S1.getSize()) + 1);
@@ -517,22 +639,16 @@
}
private:
- /// Simple cost model for edit actions.
+ /// We use a simple cost model for edit actions, which seems good enough.
/// The values range between 0 and 1, or infinity if this edit action should
/// always be avoided.
-
- /// These costs could be modified to better model the estimated cost of /
- /// inserting / deleting the current node.
static constexpr double DeletionCost = 1;
static constexpr double InsertionCost = 1;
double getUpdateCost(SNodeId Id1, SNodeId Id2) {
- const DynTypedNode &DTN1 = S1.getNode(Id1).ASTNode,
- &DTN2 = S2.getNode(Id2).ASTNode;
- if (!DiffImpl.Options.isMatchingAllowed(DTN1, DTN2))
+ if (!DiffImpl.isMatchingPossible(S1.getIdInRoot(Id1), S2.getIdInRoot(Id2)))
return std::numeric_limits<double>::max();
- return DiffImpl.Options.getNodeDistance(*DiffImpl.T1.Parent, DTN1,
- *DiffImpl.T2.Parent, DTN2);
+ return S1.getNodeValue(Id1) != S2.getNodeValue(Id2);
}
void computeTreeDist() {
@@ -571,26 +687,60 @@
}
};
+ast_type_traits::ASTNodeKind Node::getType() const {
+ return ASTNode.getNodeKind();
+}
+
+const StringRef Node::getTypeLabel() const { return getType().asStringRef(); }
+
+llvm::Optional<const std::string> Node::getQualifiedIdentifier() const {
+ if (auto *ND = ASTNode.get<NamedDecl>())
+ return ND->getQualifiedNameAsString();
+ return llvm::None;
+}
+
+llvm::Optional<const StringRef> Node::getIdentifier() const {
+ if (auto *ND = ASTNode.get<NamedDecl>())
+ return ND->getName();
+ return llvm::None;
+}
+
+Mapping::Mapping(size_t Size) {
+ SrcToDst = llvm::make_unique<NodeId[]>(Size);
+ DstToSrc = llvm::make_unique<NodeId[]>(Size);
+}
+
+void Mapping::link(NodeId Src, NodeId Dst) {
+ SrcToDst[Src] = Dst;
+ DstToSrc[Dst] = Src;
+}
+
+NodeId Mapping::getDst(NodeId Src) const { return SrcToDst[Src]; }
+NodeId Mapping::getSrc(NodeId Dst) const { return DstToSrc[Dst]; }
+bool Mapping::hasSrc(NodeId Src) const { return getDst(Src).isValid(); }
+bool Mapping::hasDst(NodeId Dst) const { return getSrc(Dst).isValid(); }
+
namespace {
// Compares nodes by their depth.
struct HeightLess {
- const SyntaxTreeImpl &Tree;
- HeightLess(const SyntaxTreeImpl &Tree) : Tree(Tree) {}
+ const SyntaxTree::Impl &Tree;
+ HeightLess(const SyntaxTree::Impl &Tree) : Tree(Tree) {}
bool operator()(NodeId Id1, NodeId Id2) const {
return Tree.getNode(Id1).Height < Tree.getNode(Id2).Height;
}
};
} // end anonymous namespace
+namespace {
// Priority queue for nodes, sorted descendingly by their height.
class PriorityList {
- const SyntaxTreeImpl &Tree;
+ const SyntaxTree::Impl &Tree;
HeightLess Cmp;
std::vector<NodeId> Container;
PriorityQueue<NodeId, std::vector<NodeId>, HeightLess> List;
public:
- PriorityList(const SyntaxTreeImpl &Tree)
+ PriorityList(const SyntaxTree::Impl &Tree)
: Tree(Tree), Cmp(Tree), List(Cmp, Container) {}
void push(NodeId id) { List.push(id); }
@@ -618,104 +768,120 @@
push(Child);
}
};
+} // end anonymous namespace
-bool ASTDiff::Impl::isomorphic(NodeId Id1, NodeId Id2) const {
+bool ASTDiff::Impl::identical(NodeId Id1, NodeId Id2) {
const Node &N1 = T1.getNode(Id1);
const Node &N2 = T2.getNode(Id2);
if (N1.Children.size() != N2.Children.size() ||
!isMatchingPossible(Id1, Id2) ||
- Options.getNodeDistance(*T1.Parent, N1.ASTNode, *T2.Parent, N2.ASTNode) !=
- 0)
+ T1.getNodeValue(Id1) != T2.getNodeValue(Id2))
return false;
for (size_t Id = 0, E = N1.Children.size(); Id < E; ++Id)
- if (!isomorphic(N1.Children[Id], N2.Children[Id]))
+ if (!identical(N1.Children[Id], N2.Children[Id]))
return false;
return true;
}
-bool ASTDiff::Impl::canBeAddedToMapping(const Mapping &M, NodeId Id1,
- NodeId Id2) const {
- assert(isMatchingPossible(Id1, Id2) &&
- "Matching must be possible in the first place.");
- if (M.hasSrcDst(Id1, Id2))
- return false;
- if (Options.EnableMatchingWithUnmatchableParents)
- return true;
- const Node &N1 = T1.getNode(Id1);
- const Node &N2 = T2.getNode(Id2);
- NodeId P1 = N1.Parent;
- NodeId P2 = N2.Parent;
- // Only allow matching if parents can be matched.
+bool ASTDiff::Impl::haveSameParents(const Mapping &M, NodeId Id1,
+ NodeId Id2) const {
+ NodeId P1 = T1.getNode(Id1).Parent;
+ NodeId P2 = T2.getNode(Id2).Parent;
return (P1.isInvalid() && P2.isInvalid()) ||
- (P1.isValid() && P2.isValid() && isMatchingPossible(P1, P2));
+ (P1.isValid() && P2.isValid() && M.getDst(P1) == P2);
}
bool ASTDiff::Impl::isMatchingPossible(NodeId Id1, NodeId Id2) const {
- return Options.isMatchingAllowed(T1.getNode(Id1).ASTNode,
- T2.getNode(Id2).ASTNode);
-}
-
-void ASTDiff::Impl::addIsomorphicSubTrees(Mapping &M, NodeId Id1,
- NodeId Id2) const {
- assert(isomorphic(Id1, Id2) && "Can only be called on isomorphic subtrees.");
- M.link(Id1, Id2);
- const Node &N1 = T1.getNode(Id1);
- const Node &N2 = T2.getNode(Id2);
- for (size_t Id = 0, E = N1.Children.size(); Id < E; ++Id)
- addIsomorphicSubTrees(M, N1.Children[Id], N2.Children[Id]);
+ return Options.isMatchingAllowed(T1.getNode(Id1), T2.getNode(Id2));
}
void ASTDiff::Impl::addOptimalMapping(Mapping &M, NodeId Id1,
NodeId Id2) const {
- if (std::max(T1.getNumberOfDescendants(Id1),
- T2.getNumberOfDescendants(Id2)) >= Options.MaxSize)
+ if (std::max(T1.getNumberOfDescendants(Id1), T2.getNumberOfDescendants(Id2)) >
+ Options.MaxSize)
return;
ZhangShashaMatcher Matcher(*this, T1, T2, Id1, Id2);
std::vector<std::pair<NodeId, NodeId>> R = Matcher.getMatchingNodes();
for (const auto Tuple : R) {
NodeId Src = Tuple.first;
NodeId Dst = Tuple.second;
- if (canBeAddedToMapping(M, Src, Dst))
+ if (!M.hasSrc(Src) && !M.hasDst(Dst))
M.link(Src, Dst);
}
}
-double ASTDiff::Impl::getSimilarity(const Mapping &M, NodeId Id1,
- NodeId Id2) const {
- if (Id1.isInvalid() || Id2.isInvalid())
- return 0.0;
+static double haveSameIdentifier(const Node &N1, const Node &N2) {
+ auto QualIdent1 = N1.getQualifiedIdentifier(),
+ QualIdent2 = N2.getQualifiedIdentifier();
+ auto Ident1 = N1.getIdentifier(), Ident2 = N2.getIdentifier();
+ if (Ident1 && Ident2 && *Ident1 == *Ident2) {
+ // If if there is some qualification (qualified identifier is different than
+ // normal identifier), it is highly likely that two names refer to the same
+ // thing, then return 1.
+ if (QualIdent1 && QualIdent2 && *Ident1 != *QualIdent1 &&
+ *QualIdent1 == *QualIdent2)
+ return 1;
+ return 0.5;
+ }
+ return 0;
+}
+
+double ASTDiff::Impl::getSimilarity(const Mapping &M, NodeId Id1, NodeId Id2) {
+ const Node &N1 = T1.getNode(Id1);
+ const Node &N2 = T2.getNode(Id2);
+ bool SameValue = T1.getNodeValue(Id1) == T2.getNodeValue(Id2);
+
+ // In addition to considering common descendants (Jaccard similarity of
+ // matched descendants), we return a similarity of at least
+ // Options.MinSimilarity for nodes that for example:
+ // - have the same parents and the same value
+ // - are functions and have the same qualified name.
+ // - are functions with same parent node and same unqualified name.
+ // This way, those nodes can be matched during the bottom-up phase.
+ double NodeSimilarity = 0.5 * haveSameParents(M, Id1, Id2) + 0.5 * SameValue +
+ 1.0 * haveSameIdentifier(N1, N2);
+ return Options.MinSimilarity * NodeSimilarity +
+ getJaccardSimilarity(M, Id1, Id2);
+}
+
+double ASTDiff::Impl::getJaccardSimilarity(const Mapping &M, NodeId Id1,
+ NodeId Id2) const {
int CommonDescendants = 0;
const Node &N1 = T1.getNode(Id1);
- for (NodeId Id = Id1 + 1; Id <= N1.RightMostDescendant; ++Id)
- CommonDescendants += int(T2.isInSubtree(M.getDst(Id), Id2));
- return 2.0 * CommonDescendants /
- (T1.getNumberOfDescendants(Id1) + T2.getNumberOfDescendants(Id2));
+ for (NodeId Src = Id1 + 1; Src <= N1.RightMostDescendant; ++Src) {
+ NodeId Dst = M.getDst(Src);
+ CommonDescendants += int(Dst.isValid() && T2.isDescendantOf(Dst, Id2));
+ }
+ double Denominator = T1.getNumberOfDescendants(Id1) +
+ T2.getNumberOfDescendants(Id2) - CommonDescendants;
+ return CommonDescendants / Denominator;
}
-NodeId ASTDiff::Impl::findCandidate(const Mapping &M, NodeId Id1) const {
+NodeId ASTDiff::Impl::findCandidate(const Mapping &M, NodeId Id1,
+ NodeId Subtree) {
NodeId Candidate;
- double MaxSimilarity = 0.0;
- for (NodeId Id2 = 0, E = T2.getSize(); Id2 < E; ++Id2) {
+ double HighestSimilarity = 0.0;
+ for (NodeId Id2 : T2.iteratePreorder(Subtree)) {
if (!isMatchingPossible(Id1, Id2))
continue;
if (M.hasDst(Id2))
continue;
double Similarity = getSimilarity(M, Id1, Id2);
- if (Similarity > MaxSimilarity) {
- MaxSimilarity = Similarity;
+ if (Similarity >= Options.MinSimilarity && Similarity > HighestSimilarity) {
+ HighestSimilarity = Similarity;
Candidate = Id2;
}
}
return Candidate;
}
-void ASTDiff::Impl::matchBottomUp(Mapping &M) const {
- std::vector<NodeId> Postorder = getSubtreePostorder(T1, T1.root());
+void ASTDiff::Impl::matchBottomUp(Mapping &M) {
+ std::vector<NodeId> Postorder = getSubtreePostorder(T1, T1.getRootId());
for (NodeId Id1 : Postorder) {
- if (Id1 == T1.root()) {
- if (isMatchingPossible(T1.root(), T2.root())) {
- M.link(T1.root(), T2.root());
- addOptimalMapping(M, T1.root(), T2.root());
+ if (Id1 == T1.getRootId() && M.hasSrc(Id1) && M.hasDst(T2.getRootId())) {
+ if (isMatchingPossible(T1.getRootId(), T2.getRootId())) {
+ M.link(T1.getRootId(), T2.getRootId());
+ addOptimalMapping(M, T1.getRootId(), T2.getRootId());
}
break;
}
@@ -726,23 +892,38 @@
[&](NodeId Child) { return M.hasSrc(Child); });
if (Matched || !MatchedChildren)
continue;
- NodeId Id2 = findCandidate(M, Id1);
- if (Id2.isInvalid() || !canBeAddedToMapping(M, Id1, Id2) ||
- getSimilarity(M, Id1, Id2) < Options.MinSimilarity)
+ NodeId Id2 = findCandidate(M, Id1, T2.getRootId());
+ if (Id2.isValid()) {
+ M.link(Id1, Id2);
+ addOptimalMapping(M, Id1, Id2);
+ }
+ }
+}
+
+void ASTDiff::Impl::matchChildren(Mapping &M) {
+ for (NodeId Id1 : T1) {
+ NodeId P1 = T1.getNode(Id1).Parent;
+ if (P1.isInvalid() || !M.hasSrc(P1))
continue;
- M.link(Id1, Id2);
- addOptimalMapping(M, Id1, Id2);
+ if (M.hasSrc(Id1))
+ continue;
+ NodeId P2 = M.getDst(P1);
+ NodeId Id2 = findCandidate(M, Id1, P2);
+ if (Id2.isValid()) {
+ M.link(Id1, Id2);
+ addOptimalMapping(M, Id1, Id2);
+ }
}
}
-Mapping ASTDiff::Impl::matchTopDown() const {
+Mapping ASTDiff::Impl::matchTopDown() {
PriorityList L1(T1);
PriorityList L2(T2);
- Mapping M(T1.getSize(), T2.getSize());
+ Mapping M(T1.getSize() + T2.getSize());
- L1.push(T1.root());
- L2.push(T2.root());
+ L1.push(T1.getRootId());
+ L2.push(T2.getRootId());
int Max1, Max2;
while (std::min(Max1 = L1.peekMax(), Max2 = L2.peekMax()) >
@@ -761,9 +942,14 @@
H1 = L1.pop();
H2 = L2.pop();
for (NodeId Id1 : H1) {
- for (NodeId Id2 : H2)
- if (isomorphic(Id1, Id2) && canBeAddedToMapping(M, Id1, Id2))
- addIsomorphicSubTrees(M, Id1, Id2);
+ for (NodeId Id2 : H2) {
+ if (identical(Id1, Id2) && !M.hasSrc(Id1) && !M.hasDst(Id2)) {
+ for (int I = 0, E = T1.getNumberOfDescendants(Id1); I < E; ++I) {
+ assert(isMatchingPossible(Id1 + I, Id2 + I));
+ M.link(Id1 + I, Id2 + I);
+ }
+ }
+ }
}
for (NodeId Id1 : H1) {
if (!M.hasSrc(Id1))
@@ -778,132 +964,139 @@
}
void ASTDiff::Impl::computeMapping() {
- if (IsMappingDone)
- return;
TheMapping = matchTopDown();
matchBottomUp(TheMapping);
- IsMappingDone = true;
+ matchChildren(TheMapping);
}
-std::vector<Match> ASTDiff::Impl::getMatches(Mapping &M) {
- std::vector<Match> Matches;
- for (NodeId Id1 = 0, Id2, E = T1.getSize(); Id1 < E; ++Id1)
- if ((Id2 = M.getDst(Id1)).isValid())
- Matches.push_back({Id1, Id2});
- return Matches;
+int SyntaxTree::Impl::findPositionInParent(NodeId Id, bool Shifted) const {
+ NodeId Parent = getNode(Id).Parent;
+ if (Parent.isInvalid())
+ return 0;
+ const auto &Siblings = getNode(Parent).Children;
+ int Position = 0;
+ for (size_t I = 0, E = Siblings.size(); I < E; ++I) {
+ if (Shifted)
+ Position += getNode(Siblings[I]).Shift;
+ if (Siblings[I] == Id) {
+ Position += I;
+ return Position;
+ }
+ }
+ llvm_unreachable("Node not found in parent's children.");
}
-std::vector<Change> ASTDiff::Impl::computeChanges(Mapping &M) {
- std::vector<Change> Changes;
- for (NodeId Id2 : getSubtreeBfs(T2, T2.root())) {
- const Node &N2 = T2.getNode(Id2);
- NodeId Id1 = M.getSrc(Id2);
- if (Id1.isValid()) {
- assert(isMatchingPossible(Id1, Id2) && "Invalid matching.");
- if (T1.getNodeValueImpl(Id1) != T2.getNodeValueImpl(Id2)) {
- Changes.emplace_back(Update, Id1, Id2);
- }
- continue;
+void ASTDiff::Impl::computeChangeKinds(Mapping &M) {
+ for (NodeId Id1 : T1) {
+ if (!M.hasSrc(Id1)) {
+ T1.getMutableNode(Id1).ChangeKind = Delete;
+ T1.getMutableNode(Id1).Shift -= 1;
}
- NodeId P2 = N2.Parent;
- NodeId P1 = M.getSrc(P2);
- assert(P1.isValid() &&
- "Parents must be matched for determining the change type.");
- Node &Parent1 = T1.getMutableNode(P1);
- const Node &Parent2 = T2.getNode(P2);
- auto &Siblings1 = Parent1.Children;
- const auto &Siblings2 = Parent2.Children;
- size_t Position;
- for (Position = 0; Position < Siblings2.size(); ++Position)
- if (Siblings2[Position] == Id2 || Position >= Siblings1.size())
- break;
- Changes.emplace_back(Insert, Id2, P2, Position);
- Node PatchNode;
- PatchNode.Parent = P1;
- PatchNode.LeftMostDescendant = N2.LeftMostDescendant;
- PatchNode.RightMostDescendant = N2.RightMostDescendant;
- PatchNode.Depth = N2.Depth;
- PatchNode.ASTNode = N2.ASTNode;
- // TODO update Depth if needed
- NodeId PatchNodeId = T1.getSize();
- // TODO maybe choose a different data structure for Children.
- Siblings1.insert(Siblings1.begin() + Position, PatchNodeId);
- T1.addNode(PatchNode);
- M.link(PatchNodeId, Id2);
- }
- for (NodeId Id1 = 0; Id1 < T1.getSize(); ++Id1) {
+ }
+ for (NodeId Id2 : T2) {
+ if (!M.hasDst(Id2)) {
+ T2.getMutableNode(Id2).ChangeKind = Insert;
+ T2.getMutableNode(Id2).Shift -= 1;
+ }
+ }
+ for (NodeId Id1 : T1.NodesBfs) {
NodeId Id2 = M.getDst(Id1);
if (Id2.isInvalid())
- Changes.emplace_back(Delete, Id1, Id2);
- }
- return Changes;
-}
-
-void ASTDiff::Impl::printChangeImpl(raw_ostream &OS, const Change &Chg) const {
- switch (Chg.Kind) {
- case Delete:
- OS << "Delete ";
- T1.printNode(OS, Chg.Src);
- OS << "\n";
- break;
- case Update:
- OS << "Update ";
- T1.printNode(OS, Chg.Src);
- OS << " to " << T2.getNodeValueImpl(Chg.Dst) << "\n";
- break;
- case Insert:
- OS << "Insert ";
- T2.printNode(OS, Chg.Src);
- OS << " into ";
- T2.printNode(OS, Chg.Dst);
- OS << " at " << Chg.Position << "\n";
- break;
- case Move:
- llvm_unreachable("TODO");
- break;
- };
+ continue;
+ if (!haveSameParents(M, Id1, Id2) ||
+ T1.findPositionInParent(Id1, true) !=
+ T2.findPositionInParent(Id2, true)) {
+ T1.getMutableNode(Id1).Shift -= 1;
+ T2.getMutableNode(Id2).Shift -= 1;
+ }
+ }
+ for (NodeId Id2 : T2.NodesBfs) {
+ NodeId Id1 = M.getSrc(Id2);
+ if (Id1.isInvalid())
+ continue;
+ Node &N1 = T1.getMutableNode(Id1);
+ Node &N2 = T2.getMutableNode(Id2);
+ if (Id1.isInvalid())
+ continue;
+ if (!haveSameParents(M, Id1, Id2) ||
+ T1.findPositionInParent(Id1, true) !=
+ T2.findPositionInParent(Id2, true)) {
+ N1.ChangeKind = N2.ChangeKind = Move;
+ }
+ if (T1.getNodeValue(Id1) != T2.getNodeValue(Id2)) {
+ N1.ChangeKind = N2.ChangeKind =
+ (N1.ChangeKind == Move ? UpdateMove : Update);
+ }
+ }
}
-void ASTDiff::Impl::printMatchImpl(raw_ostream &OS, const Match &M) const {
- OS << "Match ";
- T1.printNode(OS, M.Src);
- OS << " to ";
- T2.printNode(OS, M.Dst);
- OS << "\n";
+ASTDiff::ASTDiff(SyntaxTree &SrcTree, SyntaxTree &DstTree,
+ const ComparisonOptions &Options)
+ : SrcTree(SrcTree), DstTree(DstTree),
+ DiffImpl(llvm::make_unique<Impl>(*SrcTree.TreeImpl, *DstTree.TreeImpl,
+ Options)) {
+ DiffImpl->computeMapping();
+ DiffImpl->computeChangeKinds(DiffImpl->TheMapping);
}
-ASTDiff::ASTDiff(SyntaxTree &T1, SyntaxTree &T2,
- const ComparisonOptions &Options)
- : DiffImpl(llvm::make_unique<Impl>(*T1.TreeImpl, *T2.TreeImpl, Options)) {}
+ASTDiff::~ASTDiff() = default;
-ASTDiff::~ASTDiff() {}
+NodeId ASTDiff::getMapped(const SyntaxTree &SourceTree, NodeId Id) const {
+ return DiffImpl->getMapped(*SourceTree.TreeImpl, Id);
+}
-SyntaxTree::SyntaxTree(const ASTContext &AST)
- : TreeImpl(llvm::make_unique<SyntaxTreeImpl>(
+SyntaxTree::SyntaxTree(ASTContext &AST)
+ : TreeImpl(llvm::make_unique<SyntaxTree::Impl>(
this, AST.getTranslationUnitDecl(), AST)) {}
-std::vector<Match> ASTDiff::getMatches() {
- DiffImpl->computeMapping();
- return DiffImpl->getMatches(DiffImpl->TheMapping);
+SyntaxTree::~SyntaxTree() = default;
+
+ASTContext &SyntaxTree::getASTContext() const { return TreeImpl->AST; }
+
+const StringRef SyntaxTree::getFilename() const {
+ return TreeImpl->getFilename();
}
-std::vector<Change> ASTDiff::getChanges() {
- DiffImpl->computeMapping();
- return DiffImpl->computeChanges(DiffImpl->TheMapping);
+int SyntaxTree::getSize() const { return TreeImpl->getSize(); }
+NodeId SyntaxTree::getRootId() const { return TreeImpl->getRootId(); }
+SyntaxTree::PreorderIterator SyntaxTree::begin() const {
+ return TreeImpl->begin();
}
+SyntaxTree::PreorderIterator SyntaxTree::end() const { return TreeImpl->end(); }
-void ASTDiff::printChange(raw_ostream &OS, const Change &Chg) const {
- DiffImpl->printChangeImpl(OS, Chg);
+const Node &SyntaxTree::getNode(NodeId Id) const {
+ return TreeImpl->getNode(Id);
}
-void ASTDiff::printMatch(raw_ostream &OS, const Match &M) const {
- DiffImpl->printMatchImpl(OS, M);
+int SyntaxTree::findPositionInParent(NodeId Id) const {
+ return TreeImpl->findPositionInParent(Id);
}
-void SyntaxTree::printAsJson(raw_ostream &OS) { TreeImpl->printAsJsonImpl(OS); }
+std::pair<unsigned, unsigned> SyntaxTree::getFileOffsets(const Node &N) const {
+ const SourceManager &SrcMgr = TreeImpl->AST.getSourceManager();
+ SourceRange Range = N.ASTNode.getSourceRange();
+ SourceLocation BeginLoc = Range.getBegin();
+ SourceLocation EndLoc = Lexer::getLocForEndOfToken(
+ Range.getEnd(), /*Offset=*/0, SrcMgr, TreeImpl->AST.getLangOpts());
+ if (auto *ThisExpr = N.ASTNode.get<CXXThisExpr>()) {
+ if (ThisExpr->isImplicit())
+ EndLoc = BeginLoc;
+ }
+ unsigned Begin = SrcMgr.getFileOffset(SrcMgr.getExpansionLoc(BeginLoc));
+ unsigned End = SrcMgr.getFileOffset(SrcMgr.getExpansionLoc(EndLoc));
+ return {Begin, End};
+}
+
+std::string SyntaxTree::getNodeValue(NodeId Id) {
+ return TreeImpl->getNodeValue(Id);
+}
+
+std::string SyntaxTree::getNodeValue(const Node &Node) {
+ return TreeImpl->getNodeValue(Node.ASTNode);
+}
-std::string SyntaxTree::getNodeValue(const DynTypedNode &DTN) const {
- return TreeImpl->getNodeValueImpl(DTN);
+const std::vector<NodeId> &SyntaxTree::getNodesBreadthFirst() const {
+ return TreeImpl->NodesBfs;
}
} // end namespace diff
Index: include/clang/Tooling/ASTDiff/ASTDiffInternal.h
===================================================================
--- include/clang/Tooling/ASTDiff/ASTDiffInternal.h
+++ include/clang/Tooling/ASTDiff/ASTDiffInternal.h
@@ -11,17 +11,16 @@
#ifndef LLVM_CLANG_TOOLING_ASTDIFF_ASTDIFFINTERNAL_H
#define LLVM_CLANG_TOOLING_ASTDIFF_ASTDIFFINTERNAL_H
-#include <utility>
-
#include "clang/AST/ASTTypeTraits.h"
namespace clang {
namespace diff {
-using DynTypedNode = ast_type_traits::DynTypedNode;
-
-struct ComparisonOptions;
class SyntaxTree;
+class SyntaxTreeImpl;
+struct ComparisonOptions;
+
+using DynTypedNode = ast_type_traits::DynTypedNode;
/// Within a tree, this identifies a node by its preorder offset.
struct NodeId {
@@ -37,156 +36,13 @@
operator int() const { return Id; }
NodeId &operator++() { return ++Id, *this; }
NodeId &operator--() { return --Id, *this; }
+ // Support defining iterators on NodeId.
+ NodeId &operator*() { return *this; }
bool isValid() const { return Id != InvalidNodeId; }
bool isInvalid() const { return Id == InvalidNodeId; }
};
-/// This represents a match between two nodes in the source and destination
-/// trees, meaning that they are likely to be related.
-struct Match {
- NodeId Src, Dst;
-};
-
-enum ChangeKind {
- Delete, // (Src): delete node Src.
- Update, // (Src, Dst): update the value of node Src to match Dst.
- Insert, // (Src, Dst, Pos): insert Src as child of Dst at offset Pos.
- Move // (Src, Dst, Pos): move Src to be a child of Dst at offset Pos.
-};
-
-struct Change {
- ChangeKind Kind;
- NodeId Src, Dst;
- size_t Position;
-
- Change(ChangeKind Kind, NodeId Src, NodeId Dst, size_t Position)
- : Kind(Kind), Src(Src), Dst(Dst), Position(Position) {}
- Change(ChangeKind Kind, NodeId Src) : Kind(Kind), Src(Src) {}
- Change(ChangeKind Kind, NodeId Src, NodeId Dst)
- : Kind(Kind), Src(Src), Dst(Dst) {}
-};
-
-/// Represents a Clang AST node, alongside some additional information.
-struct Node {
- NodeId Parent, LeftMostDescendant, RightMostDescendant;
- int Depth, Height;
- DynTypedNode ASTNode;
- SmallVector<NodeId, 4> Children;
-
- ast_type_traits::ASTNodeKind getType() const { return ASTNode.getNodeKind(); }
- const StringRef getTypeLabel() const { return getType().asStringRef(); }
- bool isLeaf() const { return Children.empty(); }
-};
-
-/// Maps nodes of the left tree to ones on the right, and vice versa.
-class Mapping {
-public:
- Mapping() = default;
- Mapping(Mapping &&Other) = default;
- Mapping &operator=(Mapping &&Other) = default;
- Mapping(int Size1, int Size2) {
- // Maximum possible size after patching one tree.
- int Size = Size1 + Size2;
- SrcToDst = llvm::make_unique<SmallVector<NodeId, 2>[]>(Size);
- DstToSrc = llvm::make_unique<SmallVector<NodeId, 2>[]>(Size);
- }
-
- void link(NodeId Src, NodeId Dst) {
- SrcToDst[Src].push_back(Dst);
- DstToSrc[Dst].push_back(Src);
- }
-
- NodeId getDst(NodeId Src) const {
- if (hasSrc(Src))
- return SrcToDst[Src][0];
- return NodeId();
- }
- NodeId getSrc(NodeId Dst) const {
- if (hasDst(Dst))
- return DstToSrc[Dst][0];
- return NodeId();
- }
- const SmallVector<NodeId, 2> &getAllDsts(NodeId Src) const {
- return SrcToDst[Src];
- }
- const SmallVector<NodeId, 2> &getAllSrcs(NodeId Dst) const {
- return DstToSrc[Dst];
- }
- bool hasSrc(NodeId Src) const { return !SrcToDst[Src].empty(); }
- bool hasDst(NodeId Dst) const { return !DstToSrc[Dst].empty(); }
- bool hasSrcDst(NodeId Src, NodeId Dst) const {
- for (NodeId DstId : SrcToDst[Src])
- if (DstId == Dst)
- return true;
- for (NodeId SrcId : DstToSrc[Dst])
- if (SrcId == Src)
- return true;
- return false;
- }
-
-private:
- std::unique_ptr<SmallVector<NodeId, 2>[]> SrcToDst, DstToSrc;
-};
-
-/// Represents the AST of a TranslationUnit.
-class SyntaxTreeImpl {
-public:
- /// Constructs a tree from the entire translation unit.
- SyntaxTreeImpl(SyntaxTree *Parent, const ASTContext &AST);
- /// Constructs a tree from an AST node.
- SyntaxTreeImpl(SyntaxTree *Parent, Decl *N, const ASTContext &AST);
- SyntaxTreeImpl(SyntaxTree *Parent, Stmt *N, const ASTContext &AST);
- template <class T>
- SyntaxTreeImpl(
- SyntaxTree *Parent,
- typename std::enable_if<std::is_base_of<Stmt, T>::value, T>::type *Node,
- const ASTContext &AST)
- : SyntaxTreeImpl(Parent, dyn_cast<Stmt>(Node), AST) {}
- template <class T>
- SyntaxTreeImpl(
- SyntaxTree *Parent,
- typename std::enable_if<std::is_base_of<Decl, T>::value, T>::type *Node,
- const ASTContext &AST)
- : SyntaxTreeImpl(Parent, dyn_cast<Decl>(Node), AST) {}
-
- SyntaxTree *Parent;
- const ASTContext &AST;
- std::vector<NodeId> Leaves;
- // Maps preorder indices to postorder ones.
- std::vector<int> PostorderIds;
-
- int getSize() const { return Nodes.size(); }
- NodeId root() const { return 0; }
-
- const Node &getNode(NodeId Id) const { return Nodes[Id]; }
- Node &getMutableNode(NodeId Id) { return Nodes[Id]; }
- bool isValidNodeId(NodeId Id) const { return Id >= 0 && Id < getSize(); }
- void addNode(Node &N) { Nodes.push_back(N); }
- int getNumberOfDescendants(NodeId Id) const;
- bool isInSubtree(NodeId Id, NodeId SubtreeRoot) const;
-
- std::string getNodeValueImpl(NodeId Id) const;
- std::string getNodeValueImpl(const DynTypedNode &DTN) const;
- /// Prints the node as "<type>[: <value>](<postorder-id)"
- void printNode(NodeId Id) const { printNode(llvm::outs(), Id); }
- void printNode(raw_ostream &OS, NodeId Id) const;
-
- void printTree() const;
- void printTree(NodeId Root) const;
- void printTree(raw_ostream &OS, NodeId Root) const;
-
- void printAsJsonImpl(raw_ostream &OS) const;
- void printNodeAsJson(raw_ostream &OS, NodeId Id) const;
-
-private:
- /// Nodes in preorder.
- std::vector<Node> Nodes;
-
- void initTree();
- void setLeftMostDescendants();
-};
-
} // end namespace diff
} // end namespace clang
#endif
Index: include/clang/Tooling/ASTDiff/ASTDiff.h
===================================================================
--- include/clang/Tooling/ASTDiff/ASTDiff.h
+++ include/clang/Tooling/ASTDiff/ASTDiff.h
@@ -25,80 +25,99 @@
namespace clang {
namespace diff {
-class SyntaxTree;
+enum ChangeKind {
+ None,
+ Delete, // (Src): delete node Src.
+ Update, // (Src, Dst): update the value of node Src to match Dst.
+ Insert, // (Src, Dst, Pos): insert Src as child of Dst at offset Pos.
+ Move, // (Src, Dst, Pos): move Src to be a child of Dst at offset Pos.
+ UpdateMove // Same as Move plus Update.
+};
+
+/// Represents a Clang AST node, alongside some additional information.
+struct Node {
+ NodeId Parent, LeftMostDescendant, RightMostDescendant;
+ int Depth, Height, Shift;
+ ast_type_traits::DynTypedNode ASTNode;
+ SmallVector<NodeId, 4> Children;
+ ChangeKind ChangeKind = None;
+
+ ast_type_traits::ASTNodeKind getType() const;
+ const StringRef getTypeLabel() const;
+ bool isLeaf() const { return Children.empty(); }
+ llvm::Optional<const std::string> getQualifiedIdentifier() const;
+ llvm::Optional<const StringRef> getIdentifier() const;
+};
class ASTDiff {
public:
- ASTDiff(SyntaxTree &T1, SyntaxTree &T2, const ComparisonOptions &Options);
+ ASTDiff(SyntaxTree &SrcTree, SyntaxTree &DstTree,
+ const ComparisonOptions &Options);
~ASTDiff();
- // Returns a list of matches.
- std::vector<Match> getMatches();
- /// Returns an edit script.
- std::vector<Change> getChanges();
+ SyntaxTree &SrcTree, &DstTree;
- // Prints an edit action.
- void printChange(raw_ostream &OS, const Change &Chg) const;
- // Prints a match between two nodes.
- void printMatch(raw_ostream &OS, const Match &M) const;
+ // Returns the ID of the node that is mapped to the given node in SourceTree.
+ NodeId getMapped(const SyntaxTree &SourceTree, NodeId Id) const;
class Impl;
-
-private:
std::unique_ptr<Impl> DiffImpl;
};
/// SyntaxTree objects represent subtrees of the AST.
/// They can be constructed from any Decl or Stmt.
class SyntaxTree {
public:
/// Constructs a tree from a translation unit.
- SyntaxTree(const ASTContext &AST);
+ SyntaxTree(ASTContext &AST);
/// Constructs a tree from any AST node.
template <class T>
- SyntaxTree(T *Node, const ASTContext &AST)
+ SyntaxTree(T *Node, ASTContext &AST)
: TreeImpl(llvm::make_unique<SyntaxTreeImpl>(this, Node, AST)) {}
+ SyntaxTree(const SyntaxTree &Tree) = delete;
+ ~SyntaxTree();
+
+ ASTContext &getASTContext() const;
+ const StringRef getFilename() const;
+
+ int getSize() const;
+ NodeId getRootId() const;
+ using PreorderIterator = NodeId;
+ PreorderIterator begin() const;
+ PreorderIterator end() const;
+
+ const Node &getNode(NodeId Id) const;
+ int findPositionInParent(NodeId Id) const;
+
+ std::pair<unsigned, unsigned> getFileOffsets(const Node &N) const;
/// Serialize the node attributes to a string representation. This should
/// uniquely distinguish nodes of the same kind. Note that this function just
/// returns a representation of the node value, not considering descendants.
- std::string getNodeValue(const DynTypedNode &DTN) const;
+ std::string getNodeValue(NodeId Id);
+ std::string getNodeValue(const Node &Node);
- void printAsJson(raw_ostream &OS);
+ const std::vector<NodeId> &getNodesBreadthFirst() const;
- std::unique_ptr<SyntaxTreeImpl> TreeImpl;
+ class Impl;
+ std::unique_ptr<Impl> TreeImpl;
};
struct ComparisonOptions {
/// During top-down matching, only consider nodes of at least this height.
int MinHeight = 2;
/// During bottom-up matching, match only nodes with at least this value as
/// the ratio of their common descendants.
- double MinSimilarity = 0.2;
+ double MinSimilarity = 0.5;
/// Whenever two subtrees are matched in the bottom-up phase, the optimal
/// mapping is computed, unless the size of either subtrees exceeds this.
int MaxSize = 100;
- /// If this is set to true, nodes that have parents that must not be matched
- /// (see NodeComparison) will be allowed to be matched.
- bool EnableMatchingWithUnmatchableParents = false;
-
/// Returns false if the nodes should never be matched.
- bool isMatchingAllowed(const DynTypedNode &N1, const DynTypedNode &N2) const {
- return N1.getNodeKind().isSame(N2.getNodeKind());
- }
-
- /// Returns zero if the nodes are considered to be equal. Returns a value
- /// indicating the editing distance between the nodes otherwise.
- /// There is no need to consider nodes that cannot be matched as input for
- /// this function (see isMatchingAllowed).
- double getNodeDistance(const SyntaxTree &T1, const DynTypedNode &N1,
- const SyntaxTree &T2, const DynTypedNode &N2) const {
- if (T1.getNodeValue(N1) == T2.getNodeValue(N2))
- return 0;
- return 1;
+ bool isMatchingAllowed(const Node &N1, const Node &N2) const {
+ return N1.getType().isSame(N2.getType());
}
};
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