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269 lines
7.6 KiB
C++
269 lines
7.6 KiB
C++
//===-- ubsan_diag.h --------------------------------------------*- C++ -*-===//
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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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// Diagnostics emission for Clang's undefined behavior sanitizer.
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//
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//===----------------------------------------------------------------------===//
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#ifndef UBSAN_DIAG_H
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#define UBSAN_DIAG_H
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#include "ubsan_value.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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namespace __ubsan {
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class SymbolizedStackHolder {
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SymbolizedStack *Stack;
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void clear() {
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if (Stack)
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Stack->ClearAll();
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}
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public:
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explicit SymbolizedStackHolder(SymbolizedStack *Stack = nullptr)
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: Stack(Stack) {}
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~SymbolizedStackHolder() { clear(); }
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void reset(SymbolizedStack *S) {
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if (Stack != S)
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clear();
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Stack = S;
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}
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const SymbolizedStack *get() const { return Stack; }
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};
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SymbolizedStack *getSymbolizedLocation(uptr PC);
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inline SymbolizedStack *getCallerLocation(uptr CallerPC) {
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CHECK(CallerPC);
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uptr PC = StackTrace::GetPreviousInstructionPc(CallerPC);
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return getSymbolizedLocation(PC);
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}
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/// A location of some data within the program's address space.
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typedef uptr MemoryLocation;
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/// \brief Location at which a diagnostic can be emitted. Either a
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/// SourceLocation, a MemoryLocation, or a SymbolizedStack.
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class Location {
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public:
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enum LocationKind { LK_Null, LK_Source, LK_Memory, LK_Symbolized };
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private:
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LocationKind Kind;
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// FIXME: In C++11, wrap these in an anonymous union.
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SourceLocation SourceLoc;
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MemoryLocation MemoryLoc;
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const SymbolizedStack *SymbolizedLoc; // Not owned.
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public:
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Location() : Kind(LK_Null) {}
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Location(SourceLocation Loc) :
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Kind(LK_Source), SourceLoc(Loc) {}
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Location(MemoryLocation Loc) :
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Kind(LK_Memory), MemoryLoc(Loc) {}
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// SymbolizedStackHolder must outlive Location object.
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Location(const SymbolizedStackHolder &Stack) :
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Kind(LK_Symbolized), SymbolizedLoc(Stack.get()) {}
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LocationKind getKind() const { return Kind; }
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bool isSourceLocation() const { return Kind == LK_Source; }
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bool isMemoryLocation() const { return Kind == LK_Memory; }
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bool isSymbolizedStack() const { return Kind == LK_Symbolized; }
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SourceLocation getSourceLocation() const {
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CHECK(isSourceLocation());
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return SourceLoc;
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}
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MemoryLocation getMemoryLocation() const {
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CHECK(isMemoryLocation());
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return MemoryLoc;
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}
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const SymbolizedStack *getSymbolizedStack() const {
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CHECK(isSymbolizedStack());
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return SymbolizedLoc;
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}
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};
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/// A diagnostic severity level.
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enum DiagLevel {
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DL_Error, ///< An error.
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DL_Note ///< A note, attached to a prior diagnostic.
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};
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/// \brief Annotation for a range of locations in a diagnostic.
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class Range {
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Location Start, End;
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const char *Text;
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public:
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Range() : Start(), End(), Text() {}
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Range(MemoryLocation Start, MemoryLocation End, const char *Text)
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: Start(Start), End(End), Text(Text) {}
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Location getStart() const { return Start; }
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Location getEnd() const { return End; }
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const char *getText() const { return Text; }
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};
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/// \brief A C++ type name. Really just a strong typedef for 'const char*'.
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class TypeName {
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const char *Name;
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public:
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TypeName(const char *Name) : Name(Name) {}
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const char *getName() const { return Name; }
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};
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enum class ErrorType {
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#define UBSAN_CHECK(Name, SummaryKind, FSanitizeFlagName) Name,
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#include "ubsan_checks.inc"
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#undef UBSAN_CHECK
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};
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/// \brief Representation of an in-flight diagnostic.
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///
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/// Temporary \c Diag instances are created by the handler routines to
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/// accumulate arguments for a diagnostic. The destructor emits the diagnostic
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/// message.
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class Diag {
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/// The location at which the problem occurred.
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Location Loc;
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/// The diagnostic level.
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DiagLevel Level;
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/// The error type.
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ErrorType ET;
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/// The message which will be emitted, with %0, %1, ... placeholders for
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/// arguments.
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const char *Message;
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public:
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/// Kinds of arguments, corresponding to members of \c Arg's union.
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enum ArgKind {
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AK_String, ///< A string argument, displayed as-is.
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AK_TypeName,///< A C++ type name, possibly demangled before display.
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AK_UInt, ///< An unsigned integer argument.
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AK_SInt, ///< A signed integer argument.
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AK_Float, ///< A floating-point argument.
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AK_Pointer ///< A pointer argument, displayed in hexadecimal.
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};
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/// An individual diagnostic message argument.
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struct Arg {
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Arg() {}
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Arg(const char *String) : Kind(AK_String), String(String) {}
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Arg(TypeName TN) : Kind(AK_TypeName), String(TN.getName()) {}
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Arg(UIntMax UInt) : Kind(AK_UInt), UInt(UInt) {}
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Arg(SIntMax SInt) : Kind(AK_SInt), SInt(SInt) {}
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Arg(FloatMax Float) : Kind(AK_Float), Float(Float) {}
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Arg(const void *Pointer) : Kind(AK_Pointer), Pointer(Pointer) {}
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ArgKind Kind;
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union {
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const char *String;
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UIntMax UInt;
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SIntMax SInt;
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FloatMax Float;
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const void *Pointer;
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};
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};
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private:
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static const unsigned MaxArgs = 8;
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static const unsigned MaxRanges = 1;
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/// The arguments which have been added to this diagnostic so far.
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Arg Args[MaxArgs];
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unsigned NumArgs;
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/// The ranges which have been added to this diagnostic so far.
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Range Ranges[MaxRanges];
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unsigned NumRanges;
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Diag &AddArg(Arg A) {
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CHECK(NumArgs != MaxArgs);
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Args[NumArgs++] = A;
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return *this;
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}
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Diag &AddRange(Range A) {
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CHECK(NumRanges != MaxRanges);
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Ranges[NumRanges++] = A;
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return *this;
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}
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/// \c Diag objects are not copyable.
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Diag(const Diag &); // NOT IMPLEMENTED
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Diag &operator=(const Diag &);
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public:
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Diag(Location Loc, DiagLevel Level, ErrorType ET, const char *Message)
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: Loc(Loc), Level(Level), ET(ET), Message(Message), NumArgs(0),
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NumRanges(0) {}
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~Diag();
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Diag &operator<<(const char *Str) { return AddArg(Str); }
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Diag &operator<<(TypeName TN) { return AddArg(TN); }
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Diag &operator<<(unsigned long long V) { return AddArg(UIntMax(V)); }
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Diag &operator<<(const void *V) { return AddArg(V); }
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Diag &operator<<(const TypeDescriptor &V);
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Diag &operator<<(const Value &V);
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Diag &operator<<(const Range &R) { return AddRange(R); }
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};
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struct ReportOptions {
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// If FromUnrecoverableHandler is specified, UBSan runtime handler is not
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// expected to return.
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bool FromUnrecoverableHandler;
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/// pc/bp are used to unwind the stack trace.
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uptr pc;
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uptr bp;
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};
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bool ignoreReport(SourceLocation SLoc, ReportOptions Opts, ErrorType ET);
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#define GET_REPORT_OPTIONS(unrecoverable_handler) \
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GET_CALLER_PC_BP; \
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ReportOptions Opts = {unrecoverable_handler, pc, bp}
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void GetStackTrace(BufferedStackTrace *stack, uptr max_depth, uptr pc, uptr bp,
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void *context, bool fast);
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/// \brief Instantiate this class before printing diagnostics in the error
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/// report. This class ensures that reports from different threads and from
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/// different sanitizers won't be mixed.
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class ScopedReport {
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struct Initializer {
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Initializer();
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};
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Initializer initializer_;
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ScopedErrorReportLock report_lock_;
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ReportOptions Opts;
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Location SummaryLoc;
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ErrorType Type;
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public:
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ScopedReport(ReportOptions Opts, Location SummaryLoc, ErrorType Type);
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~ScopedReport();
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static void CheckLocked() { ScopedErrorReportLock::CheckLocked(); }
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};
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void InitializeSuppressions();
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bool IsVptrCheckSuppressed(const char *TypeName);
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// Sometimes UBSan runtime can know filename from handlers arguments, even if
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// debug info is missing.
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bool IsPCSuppressed(ErrorType ET, uptr PC, const char *Filename);
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} // namespace __ubsan
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#endif // UBSAN_DIAG_H
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