forked from OSchip/llvm-project
603 lines
19 KiB
C++
603 lines
19 KiB
C++
//===--- ResolveLocation.cpp - Source location resolver ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This defines the ResolveLocationInAST function, which resolves a
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// source location into a ASTLocation.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Index/Utils.h"
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#include "clang/Index/ASTLocation.h"
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#include "clang/AST/TypeLocVisitor.h"
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#include "clang/AST/DeclVisitor.h"
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#include "clang/AST/StmtVisitor.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Basic/SourceManager.h"
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using namespace clang;
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using namespace idx;
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namespace {
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/// \brief Base for the LocResolver classes. Mostly does source range checking.
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class LocResolverBase {
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protected:
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ASTContext &Ctx;
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SourceLocation Loc;
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ASTLocation ResolveInDeclarator(Decl *D, Stmt *Stm, TypeSourceInfo *TInfo);
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enum RangePos {
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BeforeLoc,
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ContainsLoc,
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AfterLoc
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};
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RangePos CheckRange(SourceRange Range);
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RangePos CheckRange(TypeSourceInfo *TInfo);
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RangePos CheckRange(Decl *D) {
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if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D))
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if (ContainsLocation(DD->getTypeSourceInfo()))
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return ContainsLoc;
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if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D))
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if (ContainsLocation(TD->getTypeSourceInfo()))
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return ContainsLoc;
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return CheckRange(D->getSourceRange());
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}
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RangePos CheckRange(Stmt *Node) { return CheckRange(Node->getSourceRange()); }
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RangePos CheckRange(TypeLoc TL) { return CheckRange(TL.getLocalSourceRange()); }
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template <typename T>
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bool isBeforeLocation(T Node) {
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return CheckRange(Node) == BeforeLoc;
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}
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template <typename T>
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bool isAfterLocation(T Node) {
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return CheckRange(Node) == AfterLoc;
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}
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public:
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LocResolverBase(ASTContext &ctx, SourceLocation loc)
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: Ctx(ctx), Loc(loc) {}
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template <typename T>
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bool ContainsLocation(T Node) {
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return CheckRange(Node) == ContainsLoc;
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}
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#ifndef NDEBUG
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/// \brief Debugging output.
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void print(Decl *D);
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/// \brief Debugging output.
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void print(Stmt *Node);
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#endif
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};
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/// \brief Searches a statement for the ASTLocation that corresponds to a source
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/// location.
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class StmtLocResolver : public LocResolverBase,
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public StmtVisitor<StmtLocResolver,
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ASTLocation > {
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Decl * const Parent;
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public:
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StmtLocResolver(ASTContext &ctx, SourceLocation loc, Decl *parent)
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: LocResolverBase(ctx, loc), Parent(parent) {}
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ASTLocation VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *Node);
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ASTLocation VisitCXXOperatorCallExpr(CXXOperatorCallExpr *Node);
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ASTLocation VisitDeclStmt(DeclStmt *Node);
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ASTLocation VisitStmt(Stmt *Node);
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};
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/// \brief Searches a declaration for the ASTLocation that corresponds to a
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/// source location.
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class DeclLocResolver : public LocResolverBase,
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public DeclVisitor<DeclLocResolver,
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ASTLocation > {
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public:
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DeclLocResolver(ASTContext &ctx, SourceLocation loc)
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: LocResolverBase(ctx, loc) {}
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ASTLocation VisitDeclContext(DeclContext *DC);
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ASTLocation VisitTranslationUnitDecl(TranslationUnitDecl *TU);
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ASTLocation VisitDeclaratorDecl(DeclaratorDecl *D);
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ASTLocation VisitVarDecl(VarDecl *D);
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ASTLocation VisitFunctionDecl(FunctionDecl *D);
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ASTLocation VisitObjCClassDecl(ObjCClassDecl *D);
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ASTLocation VisitObjCMethodDecl(ObjCMethodDecl *D);
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ASTLocation VisitTypedefDecl(TypedefDecl *D);
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ASTLocation VisitDecl(Decl *D);
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};
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class TypeLocResolver : public LocResolverBase,
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public TypeLocVisitor<TypeLocResolver, ASTLocation> {
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Decl * const ParentDecl;
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public:
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TypeLocResolver(ASTContext &ctx, SourceLocation loc, Decl *pd)
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: LocResolverBase(ctx, loc), ParentDecl(pd) { }
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ASTLocation VisitBuiltinTypeLoc(BuiltinTypeLoc TL);
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ASTLocation VisitTypedefTypeLoc(TypedefTypeLoc TL);
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ASTLocation VisitFunctionTypeLoc(FunctionTypeLoc TL);
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ASTLocation VisitArrayTypeLoc(ArrayTypeLoc TL);
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ASTLocation VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL);
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ASTLocation VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL);
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ASTLocation VisitTypeLoc(TypeLoc TL);
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};
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} // anonymous namespace
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ASTLocation
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StmtLocResolver::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *Node) {
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assert(ContainsLocation(Node) &&
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"Should visit only after verifying that loc is in range");
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if (Node->isArgumentType()) {
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TypeSourceInfo *TInfo = Node->getArgumentTypeInfo();
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if (ContainsLocation(TInfo))
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return ResolveInDeclarator(Parent, Node, TInfo);
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} else {
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Expr *SubNode = Node->getArgumentExpr();
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if (ContainsLocation(SubNode))
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return Visit(SubNode);
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}
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return ASTLocation(Parent, Node);
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}
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ASTLocation
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StmtLocResolver::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *Node) {
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assert(ContainsLocation(Node) &&
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"Should visit only after verifying that loc is in range");
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if (Node->getNumArgs() == 1)
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// Unary operator. Let normal child traversal handle it.
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return VisitCallExpr(Node);
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assert(Node->getNumArgs() == 2 &&
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"Wrong args for the C++ operator call expr ?");
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llvm::SmallVector<Expr *, 3> Nodes;
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// Binary operator. Check in order of 1-left arg, 2-callee, 3-right arg.
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Nodes.push_back(Node->getArg(0));
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Nodes.push_back(Node->getCallee());
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Nodes.push_back(Node->getArg(1));
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for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
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RangePos RP = CheckRange(Nodes[i]);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return Visit(Nodes[i]);
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}
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return ASTLocation(Parent, Node);
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}
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ASTLocation StmtLocResolver::VisitDeclStmt(DeclStmt *Node) {
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assert(ContainsLocation(Node) &&
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"Should visit only after verifying that loc is in range");
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// Search all declarations of this DeclStmt.
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for (DeclStmt::decl_iterator
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I = Node->decl_begin(), E = Node->decl_end(); I != E; ++I) {
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RangePos RP = CheckRange(*I);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return DeclLocResolver(Ctx, Loc).Visit(*I);
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}
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return ASTLocation(Parent, Node);
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}
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ASTLocation StmtLocResolver::VisitStmt(Stmt *Node) {
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assert(ContainsLocation(Node) &&
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"Should visit only after verifying that loc is in range");
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// Search the child statements.
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for (Stmt::child_iterator
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I = Node->child_begin(), E = Node->child_end(); I != E; ++I) {
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if (*I == NULL)
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continue;
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RangePos RP = CheckRange(*I);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return Visit(*I);
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}
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return ASTLocation(Parent, Node);
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}
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ASTLocation DeclLocResolver::VisitDeclContext(DeclContext *DC) {
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for (DeclContext::decl_iterator
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I = DC->decls_begin(), E = DC->decls_end(); I != E; ++I) {
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RangePos RP = CheckRange(*I);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return Visit(*I);
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}
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return ASTLocation(cast<Decl>(DC));
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}
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ASTLocation DeclLocResolver::VisitTranslationUnitDecl(TranslationUnitDecl *TU) {
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ASTLocation ASTLoc = VisitDeclContext(TU);
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if (ASTLoc.getParentDecl() == TU)
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return ASTLocation();
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return ASTLoc;
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}
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ASTLocation DeclLocResolver::VisitFunctionDecl(FunctionDecl *D) {
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assert(ContainsLocation(D) &&
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"Should visit only after verifying that loc is in range");
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if (ContainsLocation(D->getTypeSourceInfo()))
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return ResolveInDeclarator(D, 0, D->getTypeSourceInfo());
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// First, search through the parameters of the function.
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for (FunctionDecl::param_iterator
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I = D->param_begin(), E = D->param_end(); I != E; ++I) {
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RangePos RP = CheckRange(*I);
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if (RP == AfterLoc)
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return ASTLocation(D);
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if (RP == ContainsLoc)
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return Visit(*I);
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}
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// We didn't find the location in the parameters and we didn't get passed it.
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if (!D->isThisDeclarationADefinition())
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return ASTLocation(D);
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// Second, search through the declarations that are part of the function.
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// If we find the location there, we won't have to search through its body.
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for (DeclContext::decl_iterator
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I = D->decls_begin(), E = D->decls_end(); I != E; ++I) {
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if (isa<ParmVarDecl>(*I))
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continue; // We already searched through the parameters.
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RangePos RP = CheckRange(*I);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return Visit(*I);
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}
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// We didn't find a declaration that corresponds to the source location.
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// Finally, search through the body of the function.
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Stmt *Body = D->getBody();
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assert(Body && "Expected definition");
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assert(!isBeforeLocation(Body) &&
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"This function is supposed to contain the loc");
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if (isAfterLocation(Body))
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return ASTLocation(D);
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// The body contains the location.
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assert(ContainsLocation(Body));
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return StmtLocResolver(Ctx, Loc, D).Visit(Body);
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}
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ASTLocation DeclLocResolver::VisitDeclaratorDecl(DeclaratorDecl *D) {
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assert(ContainsLocation(D) &&
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"Should visit only after verifying that loc is in range");
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if (ContainsLocation(D->getTypeSourceInfo()))
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return ResolveInDeclarator(D, /*Stmt=*/0, D->getTypeSourceInfo());
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return ASTLocation(D);
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}
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ASTLocation DeclLocResolver::VisitTypedefDecl(TypedefDecl *D) {
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assert(ContainsLocation(D) &&
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"Should visit only after verifying that loc is in range");
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if (ContainsLocation(D->getTypeSourceInfo()))
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return ResolveInDeclarator(D, /*Stmt=*/0, D->getTypeSourceInfo());
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return ASTLocation(D);
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}
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ASTLocation DeclLocResolver::VisitVarDecl(VarDecl *D) {
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assert(ContainsLocation(D) &&
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"Should visit only after verifying that loc is in range");
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// Check whether the location points to the init expression.
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Expr *Init = D->getInit();
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if (Init && ContainsLocation(Init))
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return StmtLocResolver(Ctx, Loc, D).Visit(Init);
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if (ContainsLocation(D->getTypeSourceInfo()))
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return ResolveInDeclarator(D, 0, D->getTypeSourceInfo());
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return ASTLocation(D);
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}
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ASTLocation DeclLocResolver::VisitObjCClassDecl(ObjCClassDecl *D) {
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assert(ContainsLocation(D) &&
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"Should visit only after verifying that loc is in range");
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for (ObjCClassDecl::iterator I = D->begin(), E = D->end() ; I != E; ++I) {
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if (CheckRange(I->getLocation()) == ContainsLoc)
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return ASTLocation(D, I->getInterface(), I->getLocation());
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}
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return ASTLocation(D);
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}
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ASTLocation DeclLocResolver::VisitObjCMethodDecl(ObjCMethodDecl *D) {
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assert(ContainsLocation(D) &&
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"Should visit only after verifying that loc is in range");
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// First, search through the parameters of the method.
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for (ObjCMethodDecl::param_iterator
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I = D->param_begin(), E = D->param_end(); I != E; ++I) {
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RangePos RP = CheckRange(*I);
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if (RP == AfterLoc)
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return ASTLocation(D);
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if (RP == ContainsLoc)
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return Visit(*I);
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}
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// We didn't find the location in the parameters and we didn't get passed it.
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if (!D->getBody())
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return ASTLocation(D);
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// Second, search through the declarations that are part of the method.
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// If we find he location there, we won't have to search through its body.
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for (DeclContext::decl_iterator
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I = D->decls_begin(), E = D->decls_end(); I != E; ++I) {
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if (isa<ParmVarDecl>(*I))
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continue; // We already searched through the parameters.
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RangePos RP = CheckRange(*I);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return Visit(*I);
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}
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// We didn't find a declaration that corresponds to the source location.
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// Finally, search through the body of the method.
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Stmt *Body = D->getBody();
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assert(Body && "Expected definition");
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assert(!isBeforeLocation(Body) &&
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"This method is supposed to contain the loc");
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if (isAfterLocation(Body))
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return ASTLocation(D);
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// The body contains the location.
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assert(ContainsLocation(Body));
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return StmtLocResolver(Ctx, Loc, D).Visit(Body);
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}
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ASTLocation DeclLocResolver::VisitDecl(Decl *D) {
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assert(ContainsLocation(D) &&
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"Should visit only after verifying that loc is in range");
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if (DeclContext *DC = dyn_cast<DeclContext>(D))
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return VisitDeclContext(DC);
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return ASTLocation(D);
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}
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ASTLocation TypeLocResolver::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
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// Continue the 'id' magic by making the builtin type (which cannot
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// actually be spelled) map to the typedef.
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BuiltinType *T = TL.getTypePtr();
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if (T->getKind() == BuiltinType::ObjCId) {
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TypedefDecl *D = Ctx.getObjCIdType()->getAs<TypedefType>()->getDecl();
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return ASTLocation(ParentDecl, D, TL.getNameLoc());
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}
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// Same thing with 'Class'.
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if (T->getKind() == BuiltinType::ObjCClass) {
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TypedefDecl *D = Ctx.getObjCClassType()->getAs<TypedefType>()->getDecl();
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return ASTLocation(ParentDecl, D, TL.getNameLoc());
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}
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return ASTLocation(ParentDecl, TL);
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}
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ASTLocation TypeLocResolver::VisitTypedefTypeLoc(TypedefTypeLoc TL) {
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assert(ContainsLocation(TL) &&
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"Should visit only after verifying that loc is in range");
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if (ContainsLocation(TL.getNameLoc()))
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return ASTLocation(ParentDecl, TL.getTypedefDecl(), TL.getNameLoc());
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return ASTLocation(ParentDecl, TL);
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}
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ASTLocation TypeLocResolver::VisitFunctionTypeLoc(FunctionTypeLoc TL) {
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assert(ContainsLocation(TL) &&
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"Should visit only after verifying that loc is in range");
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for (unsigned i = 0; i != TL.getNumArgs(); ++i) {
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ParmVarDecl *Parm = TL.getArg(i);
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RangePos RP = CheckRange(Parm);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return DeclLocResolver(Ctx, Loc).Visit(Parm);
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}
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return ASTLocation(ParentDecl, TL);
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}
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ASTLocation TypeLocResolver::VisitArrayTypeLoc(ArrayTypeLoc TL) {
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assert(ContainsLocation(TL) &&
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"Should visit only after verifying that loc is in range");
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Expr *E = TL.getSizeExpr();
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if (E && ContainsLocation(E))
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return StmtLocResolver(Ctx, Loc, ParentDecl).Visit(E);
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return ASTLocation(ParentDecl, TL);
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}
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ASTLocation TypeLocResolver::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
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assert(ContainsLocation(TL) &&
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"Should visit only after verifying that loc is in range");
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if (ContainsLocation(TL.getNameLoc()))
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return ASTLocation(ParentDecl, TL.getIFaceDecl(), TL.getNameLoc());
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return ASTLocation(ParentDecl, TL);
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}
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ASTLocation TypeLocResolver::VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
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assert(ContainsLocation(TL) &&
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"Should visit only after verifying that loc is in range");
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for (unsigned i = 0; i != TL.getNumProtocols(); ++i) {
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SourceLocation L = TL.getProtocolLoc(i);
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RangePos RP = CheckRange(L);
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if (RP == AfterLoc)
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break;
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if (RP == ContainsLoc)
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return ASTLocation(ParentDecl, TL.getProtocol(i), L);
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}
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return ASTLocation(ParentDecl, TL);
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}
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ASTLocation TypeLocResolver::VisitTypeLoc(TypeLoc TL) {
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assert(ContainsLocation(TL) &&
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"Should visit only after verifying that loc is in range");
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return ASTLocation(ParentDecl, TL);
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}
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ASTLocation LocResolverBase::ResolveInDeclarator(Decl *D, Stmt *Stm,
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TypeSourceInfo *TInfo) {
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assert(ContainsLocation(TInfo) &&
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"Should visit only after verifying that loc is in range");
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(void)TypeLocResolver(Ctx, Loc, D);
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for (TypeLoc TL = TInfo->getTypeLoc(); TL; TL = TL.getNextTypeLoc())
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if (ContainsLocation(TL))
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return TypeLocResolver(Ctx, Loc, D).Visit(TL);
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assert(0 && "Should have found the loc in a typeloc");
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return ASTLocation(D, Stm);
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}
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LocResolverBase::RangePos LocResolverBase::CheckRange(TypeSourceInfo *TInfo) {
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if (!TInfo)
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return BeforeLoc; // Keep looking.
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for (TypeLoc TL = TInfo->getTypeLoc(); TL; TL = TL.getNextTypeLoc())
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if (ContainsLocation(TL))
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return ContainsLoc;
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return BeforeLoc; // Keep looking.
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}
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LocResolverBase::RangePos LocResolverBase::CheckRange(SourceRange Range) {
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if (!Range.isValid())
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return BeforeLoc; // Keep looking.
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// Update the end source range to cover the full length of the token
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// positioned at the end of the source range.
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//
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// e.g.,
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// int foo
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// ^ ^
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//
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// will be updated to
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// int foo
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// ^ ^
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unsigned TokSize = Lexer::MeasureTokenLength(Range.getEnd(),
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Ctx.getSourceManager(),
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Ctx.getLangOptions());
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Range.setEnd(Range.getEnd().getFileLocWithOffset(TokSize-1));
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SourceManager &SourceMgr = Ctx.getSourceManager();
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|
if (SourceMgr.isBeforeInTranslationUnit(Range.getEnd(), Loc))
|
|
return BeforeLoc;
|
|
|
|
if (SourceMgr.isBeforeInTranslationUnit(Loc, Range.getBegin()))
|
|
return AfterLoc;
|
|
|
|
return ContainsLoc;
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
void LocResolverBase::print(Decl *D) {
|
|
llvm::raw_ostream &OS = llvm::outs();
|
|
OS << "#### DECL " << D->getDeclKindName() << " ####\n";
|
|
D->print(OS);
|
|
OS << " <";
|
|
D->getLocStart().print(OS, Ctx.getSourceManager());
|
|
OS << " > - <";
|
|
D->getLocEnd().print(OS, Ctx.getSourceManager());
|
|
OS << ">\n\n";
|
|
OS.flush();
|
|
}
|
|
|
|
void LocResolverBase::print(Stmt *Node) {
|
|
llvm::raw_ostream &OS = llvm::outs();
|
|
OS << "#### STMT " << Node->getStmtClassName() << " ####\n";
|
|
Node->printPretty(OS, Ctx, 0, PrintingPolicy(Ctx.getLangOptions()));
|
|
OS << " <";
|
|
Node->getLocStart().print(OS, Ctx.getSourceManager());
|
|
OS << " > - <";
|
|
Node->getLocEnd().print(OS, Ctx.getSourceManager());
|
|
OS << ">\n\n";
|
|
OS.flush();
|
|
}
|
|
#endif
|
|
|
|
|
|
/// \brief Returns the AST node that a source location points to.
|
|
///
|
|
ASTLocation idx::ResolveLocationInAST(ASTContext &Ctx, SourceLocation Loc,
|
|
ASTLocation *LastLoc) {
|
|
if (Loc.isInvalid())
|
|
return ASTLocation();
|
|
|
|
if (LastLoc && LastLoc->isValid()) {
|
|
DeclContext *DC = 0;
|
|
|
|
if (Decl *Dcl = LastLoc->dyn_AsDecl()) {
|
|
DC = Dcl->getDeclContext();
|
|
} else if (LastLoc->isStmt()) {
|
|
Decl *Parent = LastLoc->getParentDecl();
|
|
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Parent))
|
|
DC = FD;
|
|
else {
|
|
// This is needed to handle statements within an initializer.
|
|
// Example:
|
|
// void func() { long double fabsf = __builtin_fabsl(__x); }
|
|
// In this case, the 'parent' of __builtin_fabsl is fabsf.
|
|
DC = Parent->getDeclContext();
|
|
}
|
|
} else { // We have 'N_NamedRef' or 'N_Type'
|
|
DC = LastLoc->getParentDecl()->getDeclContext();
|
|
}
|
|
assert(DC && "Missing DeclContext");
|
|
|
|
FunctionDecl *FD = dyn_cast<FunctionDecl>(DC);
|
|
DeclLocResolver DLocResolver(Ctx, Loc);
|
|
|
|
if (FD && FD->isThisDeclarationADefinition() &&
|
|
DLocResolver.ContainsLocation(FD)) {
|
|
return DLocResolver.VisitFunctionDecl(FD);
|
|
}
|
|
// Fall through and try the slow path...
|
|
// FIXME: Optimize more cases.
|
|
}
|
|
return DeclLocResolver(Ctx, Loc).Visit(Ctx.getTranslationUnitDecl());
|
|
}
|