diff options
Diffstat (limited to 'lib/DebugInfo/DWARFFormValue.cpp')
| -rw-r--r-- | lib/DebugInfo/DWARFFormValue.cpp | 304 |
1 files changed, 159 insertions, 145 deletions
diff --git a/lib/DebugInfo/DWARFFormValue.cpp b/lib/DebugInfo/DWARFFormValue.cpp index 1a1cf24..da71fb3 100644 --- a/lib/DebugInfo/DWARFFormValue.cpp +++ b/lib/DebugInfo/DWARFFormValue.cpp @@ -10,6 +10,8 @@ #include "llvm/DebugInfo/DWARFFormValue.h" #include "DWARFCompileUnit.h" #include "DWARFContext.h" +#include "llvm/ADT/ArrayRef.h" +#include "llvm/ADT/StringRef.h" #include "llvm/Support/Debug.h" #include "llvm/Support/Dwarf.h" #include "llvm/Support/Format.h" @@ -19,64 +21,114 @@ using namespace llvm; using namespace dwarf; namespace { -template <uint8_t AddrSize, uint8_t RefAddrSize> struct FixedFormSizes { - static const uint8_t sizes[]; -}; +uint8_t getRefAddrSize(uint8_t AddrSize, uint16_t Version) { + // FIXME: Support DWARF64. + return (Version == 2) ? AddrSize : 4; } template <uint8_t AddrSize, uint8_t RefAddrSize> -const uint8_t FixedFormSizes<AddrSize, RefAddrSize>::sizes[] = { - 0, // 0x00 unused - AddrSize, // 0x01 DW_FORM_addr - 0, // 0x02 unused - 0, // 0x03 DW_FORM_block2 - 0, // 0x04 DW_FORM_block4 - 2, // 0x05 DW_FORM_data2 - 4, // 0x06 DW_FORM_data4 - 8, // 0x07 DW_FORM_data8 - 0, // 0x08 DW_FORM_string - 0, // 0x09 DW_FORM_block - 0, // 0x0a DW_FORM_block1 - 1, // 0x0b DW_FORM_data1 - 1, // 0x0c DW_FORM_flag - 0, // 0x0d DW_FORM_sdata - 4, // 0x0e DW_FORM_strp - 0, // 0x0f DW_FORM_udata - RefAddrSize, // 0x10 DW_FORM_ref_addr - 1, // 0x11 DW_FORM_ref1 - 2, // 0x12 DW_FORM_ref2 - 4, // 0x13 DW_FORM_ref4 - 8, // 0x14 DW_FORM_ref8 - 0, // 0x15 DW_FORM_ref_udata - 0, // 0x16 DW_FORM_indirect - 4, // 0x17 DW_FORM_sec_offset - 0, // 0x18 DW_FORM_exprloc - 0, // 0x19 DW_FORM_flag_present - 8, // 0x20 DW_FORM_ref_sig8 -}; - -static uint8_t getRefAddrSize(uint8_t AddrSize, uint16_t Version) { - // FIXME: Support DWARF64. - return (Version == 2) ? AddrSize : 4; +ArrayRef<uint8_t> makeFixedFormSizesArrayRef() { + static const uint8_t sizes[] = { + 0, // 0x00 unused + AddrSize, // 0x01 DW_FORM_addr + 0, // 0x02 unused + 0, // 0x03 DW_FORM_block2 + 0, // 0x04 DW_FORM_block4 + 2, // 0x05 DW_FORM_data2 + 4, // 0x06 DW_FORM_data4 + 8, // 0x07 DW_FORM_data8 + 0, // 0x08 DW_FORM_string + 0, // 0x09 DW_FORM_block + 0, // 0x0a DW_FORM_block1 + 1, // 0x0b DW_FORM_data1 + 1, // 0x0c DW_FORM_flag + 0, // 0x0d DW_FORM_sdata + 4, // 0x0e DW_FORM_strp + 0, // 0x0f DW_FORM_udata + RefAddrSize, // 0x10 DW_FORM_ref_addr + 1, // 0x11 DW_FORM_ref1 + 2, // 0x12 DW_FORM_ref2 + 4, // 0x13 DW_FORM_ref4 + 8, // 0x14 DW_FORM_ref8 + 0, // 0x15 DW_FORM_ref_udata + 0, // 0x16 DW_FORM_indirect + 4, // 0x17 DW_FORM_sec_offset + 0, // 0x18 DW_FORM_exprloc + 0, // 0x19 DW_FORM_flag_present + }; + return makeArrayRef(sizes); +} } -const uint8_t * -DWARFFormValue::getFixedFormSizes(uint8_t AddrSize, uint16_t Version) { +ArrayRef<uint8_t> DWARFFormValue::getFixedFormSizes(uint8_t AddrSize, + uint16_t Version) { uint8_t RefAddrSize = getRefAddrSize(AddrSize, Version); if (AddrSize == 4 && RefAddrSize == 4) - return FixedFormSizes<4, 4>::sizes; + return makeFixedFormSizesArrayRef<4, 4>(); if (AddrSize == 4 && RefAddrSize == 8) - return FixedFormSizes<4, 8>::sizes; + return makeFixedFormSizesArrayRef<4, 8>(); if (AddrSize == 8 && RefAddrSize == 4) - return FixedFormSizes<8, 4>::sizes; + return makeFixedFormSizesArrayRef<8, 4>(); if (AddrSize == 8 && RefAddrSize == 8) - return FixedFormSizes<8, 8>::sizes; - return 0; + return makeFixedFormSizesArrayRef<8, 8>(); + return None; } -bool -DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr, - const DWARFCompileUnit *cu) { +static const DWARFFormValue::FormClass DWARF4FormClasses[] = { + DWARFFormValue::FC_Unknown, // 0x0 + DWARFFormValue::FC_Address, // 0x01 DW_FORM_addr + DWARFFormValue::FC_Unknown, // 0x02 unused + DWARFFormValue::FC_Block, // 0x03 DW_FORM_block2 + DWARFFormValue::FC_Block, // 0x04 DW_FORM_block4 + DWARFFormValue::FC_Constant, // 0x05 DW_FORM_data2 + // --- These can be FC_SectionOffset in DWARF3 and below: + DWARFFormValue::FC_Constant, // 0x06 DW_FORM_data4 + DWARFFormValue::FC_Constant, // 0x07 DW_FORM_data8 + // --- + DWARFFormValue::FC_String, // 0x08 DW_FORM_string + DWARFFormValue::FC_Block, // 0x09 DW_FORM_block + DWARFFormValue::FC_Block, // 0x0a DW_FORM_block1 + DWARFFormValue::FC_Constant, // 0x0b DW_FORM_data1 + DWARFFormValue::FC_Flag, // 0x0c DW_FORM_flag + DWARFFormValue::FC_Constant, // 0x0d DW_FORM_sdata + DWARFFormValue::FC_String, // 0x0e DW_FORM_strp + DWARFFormValue::FC_Constant, // 0x0f DW_FORM_udata + DWARFFormValue::FC_Reference, // 0x10 DW_FORM_ref_addr + DWARFFormValue::FC_Reference, // 0x11 DW_FORM_ref1 + DWARFFormValue::FC_Reference, // 0x12 DW_FORM_ref2 + DWARFFormValue::FC_Reference, // 0x13 DW_FORM_ref4 + DWARFFormValue::FC_Reference, // 0x14 DW_FORM_ref8 + DWARFFormValue::FC_Reference, // 0x15 DW_FORM_ref_udata + DWARFFormValue::FC_Indirect, // 0x16 DW_FORM_indirect + DWARFFormValue::FC_SectionOffset, // 0x17 DW_FORM_sec_offset + DWARFFormValue::FC_Exprloc, // 0x18 DW_FORM_exprloc + DWARFFormValue::FC_Flag, // 0x19 DW_FORM_flag_present +}; + +bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const { + // First, check DWARF4 form classes. + if (Form < ArrayRef<FormClass>(DWARF4FormClasses).size() && + DWARF4FormClasses[Form] == FC) + return true; + // Check DW_FORM_ref_sig8 from DWARF4. + if (Form == DW_FORM_ref_sig8) + return (FC == FC_Reference); + // Check for some DWARF5 forms. + if (Form == DW_FORM_GNU_addr_index) + return (FC == FC_Address); + if (Form == DW_FORM_GNU_str_index) + return (FC == FC_String); + // In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset. + // Don't check for DWARF version here, as some producers may still do this + // by mistake. + if ((Form == DW_FORM_data4 || Form == DW_FORM_data8) && + FC == FC_SectionOffset) + return true; + return false; +} + +bool DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr, + const DWARFUnit *cu) { bool indirect = false; bool is_block = false; Value.data = NULL; @@ -156,10 +208,6 @@ DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr, break; case DW_FORM_string: Value.cstr = data.getCStr(offset_ptr); - // Set the string value to also be the data for inlined cstr form - // values only so we can tell the differnence between DW_FORM_string - // and DW_FORM_strp form values - Value.data = (const uint8_t*)Value.cstr; break; case DW_FORM_indirect: Form = data.getULEB128(offset_ptr); @@ -183,8 +231,6 @@ DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr, Value.uval = data.getU64(offset_ptr); break; case DW_FORM_GNU_addr_index: - Value.uval = data.getULEB128(offset_ptr); - break; case DW_FORM_GNU_str_index: Value.uval = data.getULEB128(offset_ptr); break; @@ -207,13 +253,13 @@ DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr, bool DWARFFormValue::skipValue(DataExtractor debug_info_data, uint32_t* offset_ptr, - const DWARFCompileUnit *cu) const { + const DWARFUnit *cu) const { return DWARFFormValue::skipValue(Form, debug_info_data, offset_ptr, cu); } bool DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data, - uint32_t *offset_ptr, const DWARFCompileUnit *cu) { + uint32_t *offset_ptr, const DWARFUnit *cu) { bool indirect = false; do { switch (form) { @@ -313,21 +359,20 @@ DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data, } void -DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const { +DWARFFormValue::dump(raw_ostream &OS, const DWARFUnit *cu) const { DataExtractor debug_str_data(cu->getStringSection(), true, 0); DataExtractor debug_str_offset_data(cu->getStringOffsetSection(), true, 0); - uint64_t uvalue = getUnsigned(); + uint64_t uvalue = Value.uval; bool cu_relative_offset = false; switch (Form) { case DW_FORM_addr: OS << format("0x%016" PRIx64, uvalue); break; case DW_FORM_GNU_addr_index: { - StringRef AddrOffsetSec = cu->getAddrOffsetSection(); OS << format(" indexed (%8.8x) address = ", (uint32_t)uvalue); - if (AddrOffsetSec.size() != 0) { - DataExtractor DA(AddrOffsetSec, true, cu->getAddressByteSize()); - OS << format("0x%016" PRIx64, getIndirectAddress(&DA, cu)); - } else + uint64_t Address; + if (cu->getAddrOffsetSectionItem(uvalue, Address)) + OS << format("0x%016" PRIx64, Address); + else OS << "<no .debug_addr section>"; break; } @@ -340,7 +385,7 @@ DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const { case DW_FORM_data8: OS << format("0x%016" PRIx64, uvalue); break; case DW_FORM_string: OS << '"'; - OS.write_escaped(getAsCString(NULL)); + OS.write_escaped(Value.cstr); OS << '"'; break; case DW_FORM_exprloc: @@ -372,25 +417,24 @@ DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const { } break; - case DW_FORM_sdata: OS << getSigned(); break; - case DW_FORM_udata: OS << getUnsigned(); break; + case DW_FORM_sdata: OS << Value.sval; break; + case DW_FORM_udata: OS << Value.uval; break; case DW_FORM_strp: { OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)uvalue); - const char* dbg_str = getAsCString(&debug_str_data); - if (dbg_str) { + Optional<const char *> DbgStr = getAsCString(cu); + if (DbgStr.hasValue()) { OS << '"'; - OS.write_escaped(dbg_str); + OS.write_escaped(DbgStr.getValue()); OS << '"'; } break; } case DW_FORM_GNU_str_index: { OS << format(" indexed (%8.8x) string = ", (uint32_t)uvalue); - const char *dbg_str = getIndirectCString(&debug_str_data, - &debug_str_offset_data); - if (dbg_str) { + Optional<const char *> DbgStr = getAsCString(cu); + if (DbgStr.hasValue()) { OS << '"'; - OS.write_escaped(dbg_str); + OS.write_escaped(DbgStr.getValue()); OS << '"'; } break; @@ -439,97 +483,67 @@ DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const { OS << format(" => {0x%8.8" PRIx64 "}", uvalue + (cu ? cu->getOffset() : 0)); } -const char* -DWARFFormValue::getAsCString(const DataExtractor *debug_str_data_ptr) const { - if (isInlinedCStr()) { +Optional<const char *> DWARFFormValue::getAsCString(const DWARFUnit *U) const { + if (!isFormClass(FC_String)) + return None; + if (Form == DW_FORM_string) return Value.cstr; - } else if (debug_str_data_ptr) { - uint32_t offset = Value.uval; - return debug_str_data_ptr->getCStr(&offset); + if (U == 0) + return None; + uint32_t Offset = Value.uval; + if (Form == DW_FORM_GNU_str_index) { + uint32_t StrOffset; + if (!U->getStringOffsetSectionItem(Offset, StrOffset)) + return None; + Offset = StrOffset; } - return NULL; -} - -const char* -DWARFFormValue::getIndirectCString(const DataExtractor *DS, - const DataExtractor *DSO) const { - if (!DS || !DSO) return NULL; - - uint32_t offset = Value.uval * 4; - uint32_t soffset = DSO->getU32(&offset); - return DS->getCStr(&soffset); -} - -uint64_t -DWARFFormValue::getIndirectAddress(const DataExtractor *DA, - const DWARFCompileUnit *cu) const { - if (!DA) return 0; - - uint32_t offset = Value.uval * cu->getAddressByteSize(); - return DA->getAddress(&offset); + if (const char *Str = U->getStringExtractor().getCStr(&Offset)) { + return Str; + } + return None; } -uint64_t DWARFFormValue::getReference(const DWARFCompileUnit *cu) const { - uint64_t die_offset = Value.uval; - switch (Form) { - case DW_FORM_ref1: - case DW_FORM_ref2: - case DW_FORM_ref4: - case DW_FORM_ref8: - case DW_FORM_ref_udata: - die_offset += (cu ? cu->getOffset() : 0); - break; - default: - break; +Optional<uint64_t> DWARFFormValue::getAsAddress(const DWARFUnit *U) const { + if (!isFormClass(FC_Address)) + return None; + if (Form == DW_FORM_GNU_addr_index) { + uint32_t Index = Value.uval; + uint64_t Result; + if (U == 0 || !U->getAddrOffsetSectionItem(Index, Result)) + return None; + return Result; } - - return die_offset; + return Value.uval; } -bool -DWARFFormValue::resolveCompileUnitReferences(const DWARFCompileUnit *cu) { +Optional<uint64_t> DWARFFormValue::getAsReference(const DWARFUnit *U) const { + if (!isFormClass(FC_Reference)) + return None; switch (Form) { case DW_FORM_ref1: case DW_FORM_ref2: case DW_FORM_ref4: case DW_FORM_ref8: case DW_FORM_ref_udata: - Value.uval += cu->getOffset(); - Form = DW_FORM_ref_addr; - return true; + if (U == 0) + return None; + return Value.uval + U->getOffset(); + case DW_FORM_ref_addr: + return Value.uval; + // FIXME: Add proper support for DW_FORM_ref_sig8 default: - break; + return Value.uval; } - return false; } -const uint8_t *DWARFFormValue::BlockData() const { - if (!isInlinedCStr()) - return Value.data; - return NULL; +Optional<uint64_t> DWARFFormValue::getAsSectionOffset() const { + if (!isFormClass(FC_SectionOffset)) + return None; + return Value.uval; } -bool DWARFFormValue::isBlockForm(uint16_t form) { - switch (form) { - case DW_FORM_exprloc: - case DW_FORM_block: - case DW_FORM_block1: - case DW_FORM_block2: - case DW_FORM_block4: - return true; - } - return false; -} - -bool DWARFFormValue::isDataForm(uint16_t form) { - switch (form) { - case DW_FORM_sdata: - case DW_FORM_udata: - case DW_FORM_data1: - case DW_FORM_data2: - case DW_FORM_data4: - case DW_FORM_data8: - return true; - } - return false; +Optional<uint64_t> DWARFFormValue::getAsUnsignedConstant() const { + if (!isFormClass(FC_Constant) || Form == DW_FORM_sdata) + return None; + return Value.uval; } |