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//===- DWARFVerifier.h ----------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_DWARF_DWARFVERIFIER_H
#define LLVM_DEBUGINFO_DWARF_DWARFVERIFIER_H
#include <cstdint>
#include <map>
#include <set>
namespace llvm {
class raw_ostream;
struct DWARFAttribute;
class DWARFContext;
class DWARFDie;
class DWARFUnit;
/// A class that verifies DWARF debug information given a DWARF Context.
class DWARFVerifier {
raw_ostream &OS;
DWARFContext &DCtx;
/// A map that tracks all references (converted absolute references) so we
/// can verify each reference points to a valid DIE and not an offset that
/// lies between to valid DIEs.
std::map<uint64_t, std::set<uint32_t>> ReferenceToDIEOffsets;
uint32_t NumDebugInfoErrors;
uint32_t NumDebugLineErrors;
/// Verifies the attribute's DWARF attribute and its value.
///
/// This function currently checks for:
/// - DW_AT_ranges values is a valid .debug_ranges offset
/// - DW_AT_stmt_list is a valid .debug_line offset
///
/// @param Die The DWARF DIE that owns the attribute value
/// @param AttrValue The DWARF attribute value to check
void verifyDebugInfoAttribute(DWARFDie &Die, DWARFAttribute &AttrValue);
/// Verifies the attribute's DWARF form.
///
/// This function currently checks for:
/// - All DW_FORM_ref values that are CU relative have valid CU offsets
/// - All DW_FORM_ref_addr values have valid .debug_info offsets
/// - All DW_FORM_strp values have valid .debug_str offsets
///
/// @param Die The DWARF DIE that owns the attribute value
/// @param AttrValue The DWARF attribute value to check
void verifyDebugInfoForm(DWARFDie &Die, DWARFAttribute &AttrValue);
/// Verifies the all valid references that were found when iterating through
/// all of the DIE attributes.
///
/// This function will verify that all references point to DIEs whose DIE
/// offset matches. This helps to ensure if a DWARF link phase moved things
/// around, that it doesn't create invalid references by failing to relocate
/// CU relative and absolute references.
void verifyDebugInfoReferences();
/// Verify the the DW_AT_stmt_list encoding and value and ensure that no
/// compile units that have the same DW_AT_stmt_list value.
void verifyDebugLineStmtOffsets();
/// Verify that all of the rows in the line table are valid.
///
/// This function currently checks for:
/// - addresses within a sequence that decrease in value
/// - invalid file indexes
void verifyDebugLineRows();
public:
DWARFVerifier(raw_ostream &S, DWARFContext &D)
: OS(S), DCtx(D), NumDebugInfoErrors(0), NumDebugLineErrors(0) {}
/// Verify the information in the .debug_info section.
///
/// Any errors are reported to the stream that was this object was
/// constructed with.
///
/// @return True if the .debug_info verifies successfully, false otherwise.
bool handleDebugInfo();
/// Verify the information in the .debug_line section.
///
/// Any errors are reported to the stream that was this object was
/// constructed with.
///
/// @return True if the .debug_line verifies successfully, false otherwise.
bool handleDebugLine();
};
} // end namespace llvm
#endif // LLVM_DEBUGINFO_DWARF_DWARFCONTEXT_H
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