| //===--- ScopeInfo.h - Information about a semantic context -----*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines FunctionScopeInfo and BlockScopeInfo. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_SEMA_SCOPE_INFO_H |
| #define LLVM_CLANG_SEMA_SCOPE_INFO_H |
| |
| #include "clang/AST/Type.h" |
| #include "clang/Basic/PartialDiagnostic.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/SetVector.h" |
| |
| namespace clang { |
| |
| class BlockDecl; |
| class IdentifierInfo; |
| class LabelDecl; |
| class ReturnStmt; |
| class Scope; |
| class SwitchStmt; |
| |
| namespace sema { |
| |
| class PossiblyUnreachableDiag { |
| public: |
| PartialDiagnostic PD; |
| SourceLocation Loc; |
| const Stmt *stmt; |
| |
| PossiblyUnreachableDiag(const PartialDiagnostic &PD, SourceLocation Loc, |
| const Stmt *stmt) |
| : PD(PD), Loc(Loc), stmt(stmt) {} |
| }; |
| |
| /// \brief Retains information about a function, method, or block that is |
| /// currently being parsed. |
| class FunctionScopeInfo { |
| public: |
| |
| /// \brief Whether this scope information structure defined information for |
| /// a block. |
| bool IsBlockInfo; |
| |
| /// \brief Whether this function contains a VLA, @try, try, C++ |
| /// initializer, or anything else that can't be jumped past. |
| bool HasBranchProtectedScope; |
| |
| /// \brief Whether this function contains any switches or direct gotos. |
| bool HasBranchIntoScope; |
| |
| /// \brief Whether this function contains any indirect gotos. |
| bool HasIndirectGoto; |
| |
| /// \brief Used to determine if errors occurred in this function or block. |
| DiagnosticErrorTrap ErrorTrap; |
| |
| /// SwitchStack - This is the current set of active switch statements in the |
| /// block. |
| SmallVector<SwitchStmt*, 8> SwitchStack; |
| |
| /// \brief The list of return statements that occur within the function or |
| /// block, if there is any chance of applying the named return value |
| /// optimization. |
| SmallVector<ReturnStmt*, 4> Returns; |
| |
| /// \brief A list of PartialDiagnostics created but delayed within the |
| /// current function scope. These diagnostics are vetted for reachability |
| /// prior to being emitted. |
| SmallVector<PossiblyUnreachableDiag, 4> PossiblyUnreachableDiags; |
| |
| void setHasBranchIntoScope() { |
| HasBranchIntoScope = true; |
| } |
| |
| void setHasBranchProtectedScope() { |
| HasBranchProtectedScope = true; |
| } |
| |
| void setHasIndirectGoto() { |
| HasIndirectGoto = true; |
| } |
| |
| bool NeedsScopeChecking() const { |
| return HasIndirectGoto || |
| (HasBranchProtectedScope && HasBranchIntoScope); |
| } |
| |
| FunctionScopeInfo(Diagnostic &Diag) |
| : IsBlockInfo(false), |
| HasBranchProtectedScope(false), |
| HasBranchIntoScope(false), |
| HasIndirectGoto(false), |
| ErrorTrap(Diag) { } |
| |
| virtual ~FunctionScopeInfo(); |
| |
| /// \brief Clear out the information in this function scope, making it |
| /// suitable for reuse. |
| void Clear(); |
| |
| static bool classof(const FunctionScopeInfo *FSI) { return true; } |
| }; |
| |
| /// \brief Retains information about a block that is currently being parsed. |
| class BlockScopeInfo : public FunctionScopeInfo { |
| public: |
| BlockDecl *TheDecl; |
| |
| /// TheScope - This is the scope for the block itself, which contains |
| /// arguments etc. |
| Scope *TheScope; |
| |
| /// ReturnType - The return type of the block, or null if the block |
| /// signature didn't provide an explicit return type. |
| QualType ReturnType; |
| |
| /// BlockType - The function type of the block, if one was given. |
| /// Its return type may be BuiltinType::Dependent. |
| QualType FunctionType; |
| |
| /// CaptureMap - A map of captured variables to (index+1) into Captures. |
| llvm::DenseMap<VarDecl*, unsigned> CaptureMap; |
| |
| /// Captures - The captured variables. |
| SmallVector<BlockDecl::Capture, 4> Captures; |
| |
| /// CapturesCXXThis - Whether this block captures 'this'. |
| bool CapturesCXXThis; |
| |
| BlockScopeInfo(Diagnostic &Diag, Scope *BlockScope, BlockDecl *Block) |
| : FunctionScopeInfo(Diag), TheDecl(Block), TheScope(BlockScope), |
| CapturesCXXThis(false) |
| { |
| IsBlockInfo = true; |
| } |
| |
| virtual ~BlockScopeInfo(); |
| |
| static bool classof(const FunctionScopeInfo *FSI) { return FSI->IsBlockInfo; } |
| static bool classof(const BlockScopeInfo *BSI) { return true; } |
| }; |
| |
| } |
| } |
| |
| #endif |