99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
// Copyright (c) 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This check ensures that 32/64-bit unstable types are not used in IPC.
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//
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// A type (or typedef) is unstable if it changes size between 32/ 64-bit
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// platforms. However, it's impossible to accurately identify unstable
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// typedefs, because their definitions rely on the preprocessor. For
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// example uintptr_t is either unsigned int or unsigned long.
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//
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// So we're not trying to be accurate, and just blacklisting some types
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// that are known to be unstable:
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// 1. Types: long / unsigned long (but not typedefs to)
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// 2. Typedefs: intmax_t, uintmax_t, intptr_t, uintptr_t, wint_t,
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// size_t, rsize_t, ssize_t, ptrdiff_t, dev_t, off_t, clock_t,
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// time_t, suseconds_t (including typedefs to)
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//
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// Additionally, templates referencing blacklisted types (e.g. vector<long>)
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// are also blacklisted.
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//
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// Blacklisted types are checked in:
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// 1. IPC::WriteParam() calls
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// 2. IPC::CheckedTuple<> specializations
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//
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#ifndef TOOLS_CLANG_PLUGINS_CHECKIPC_VISITOR_H_
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#define TOOLS_CLANG_PLUGINS_CHECKIPC_VISITOR_H_
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#include <vector>
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#include "clang/AST/AST.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/AST/RecursiveASTVisitor.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "llvm/ADT/StringSet.h"
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namespace chrome_checker {
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class CheckIPCVisitor {
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public:
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explicit CheckIPCVisitor(clang::CompilerInstance& compiler);
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void set_context(clang::ASTContext* context) { context_ = context; }
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void BeginDecl(clang::Decl* decl);
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void EndDecl();
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void VisitTemplateSpecializationType(
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clang::TemplateSpecializationType* spec);
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void VisitCallExpr(clang::CallExpr* call_expr);
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private:
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// ValidateXXX functions return false if validation failed and diagnostic
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// was reported. They return true otherwise (not applicable / validation
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// succeeded).
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bool ValidateWriteParam(const clang::CallExpr* call_expr);
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bool ValidateWriteParamSignature(const clang::CallExpr* call_expr);
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bool ValidateWriteParamArgument(const clang::Expr* arg_expr);
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bool ValidateCheckedTuple(
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const clang::TemplateSpecializationType* spec);
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template <typename T>
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const T* GetParentDecl() const;
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bool IsBlacklistedType(clang::QualType type) const;
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bool IsBlacklistedTypedef(const clang::TypedefNameDecl* tdef) const;
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struct CheckDetails {
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clang::QualType entry_type;
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clang::QualType exit_type;
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llvm::SmallVector<const clang::TypedefType*, 5> typedefs;
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};
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bool CheckType(clang::QualType type, CheckDetails* details) const;
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bool CheckIntegerType(clang::QualType type, CheckDetails* details) const;
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bool CheckTemplateArgument(const clang::TemplateArgument& arg,
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CheckDetails* details) const;
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void ReportCheckError(const CheckDetails& details,
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clang::SourceLocation loc,
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unsigned error);
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clang::CompilerInstance& compiler_;
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clang::ASTContext* context_;
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unsigned error_write_param_bad_type_;
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unsigned error_tuple_bad_type_;
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unsigned error_write_param_bad_signature_;
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unsigned note_see_here_;
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std::vector<const clang::Decl*> decl_stack_;
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llvm::StringSet<> blacklisted_typedefs_;
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};
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} // namespace chrome_checker
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#endif // TOOLS_CLANG_PLUGINS_CHECKIPC_VISITOR_H_
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