//
//===----------------------------------------------------------------------===//
-#include "DWARFFormValue.h"
+#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"
using namespace llvm;
using namespace dwarf;
-static const uint8_t form_sizes_addr4[] = {
- 0, // 0x00 unused
- 4, // 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
- 4, // 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
-};
+namespace {
+uint8_t getRefAddrSize(uint8_t AddrSize, uint16_t Version) {
+ // FIXME: Support DWARF64.
+ return (Version == 2) ? AddrSize : 4;
+}
+
+template <uint8_t AddrSize, uint8_t RefAddrSize>
+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);
+}
+}
-static const uint8_t form_sizes_addr8[] = {
- 0, // 0x00 unused
- 8, // 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
- 8, // 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
- 8, // 0x17 DW_FORM_sec_offset
- 0, // 0x18 DW_FORM_exprloc
- 0, // 0x19 DW_FORM_flag_present
- 8, // 0x20 DW_FORM_ref_sig8
+ArrayRef<uint8_t> DWARFFormValue::getFixedFormSizes(uint8_t AddrSize,
+ uint16_t Version) {
+ uint8_t RefAddrSize = getRefAddrSize(AddrSize, Version);
+ if (AddrSize == 4 && RefAddrSize == 4)
+ return makeFixedFormSizesArrayRef<4, 4>();
+ if (AddrSize == 4 && RefAddrSize == 8)
+ return makeFixedFormSizesArrayRef<4, 8>();
+ if (AddrSize == 8 && RefAddrSize == 4)
+ return makeFixedFormSizesArrayRef<8, 4>();
+ if (AddrSize == 8 && RefAddrSize == 8)
+ return makeFixedFormSizesArrayRef<8, 8>();
+ return None;
+}
+
+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
};
-const uint8_t *
-DWARFFormValue::getFixedFormSizesForAddressSize(uint8_t addr_size) {
- switch (addr_size) {
- case 4: return form_sizes_addr4;
- case 8: return form_sizes_addr8;
- }
- return NULL;
+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 DWARFCompileUnit *cu) {
+bool DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
+ const DWARFUnit *cu) {
bool indirect = false;
bool is_block = false;
- Value.data = NULL;
+ Value.data = nullptr;
// Read the value for the form into value and follow and DW_FORM_indirect
// instances we run into
do {
switch (Form) {
case DW_FORM_addr:
case DW_FORM_ref_addr: {
- RelocAddrMap::const_iterator AI
- = cu->getRelocMap()->find(*offset_ptr);
+ uint16_t AddrSize =
+ (Form == DW_FORM_addr)
+ ? cu->getAddressByteSize()
+ : getRefAddrSize(cu->getAddressByteSize(), cu->getVersion());
+ RelocAddrMap::const_iterator AI = cu->getRelocMap()->find(*offset_ptr);
if (AI != cu->getRelocMap()->end()) {
const std::pair<uint8_t, int64_t> &R = AI->second;
- Value.uval = data.getUnsigned(offset_ptr, cu->getAddressByteSize()) +
- R.second;
+ Value.uval = data.getUnsigned(offset_ptr, AddrSize) + R.second;
} else
- Value.uval = data.getUnsigned(offset_ptr, cu->getAddressByteSize());
+ Value.uval = data.getUnsigned(offset_ptr, AddrSize);
break;
}
case DW_FORM_exprloc:
Value.uval = data.getU16(offset_ptr);
break;
case DW_FORM_data4:
- case DW_FORM_ref4:
+ case DW_FORM_ref4: {
+ RelocAddrMap::const_iterator AI = cu->getRelocMap()->find(*offset_ptr);
Value.uval = data.getU32(offset_ptr);
+ if (AI != cu->getRelocMap()->end())
+ Value.uval += AI->second.second;
break;
+ }
case DW_FORM_data8:
case DW_FORM_ref8:
Value.uval = data.getU64(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);
indirect = true;
break;
- case DW_FORM_sec_offset:
- if (cu->getAddressByteSize() == 4)
+ case DW_FORM_sec_offset: {
+ // FIXME: This is 64-bit for DWARF64.
+ RelocAddrMap::const_iterator AI
+ = cu->getRelocMap()->find(*offset_ptr);
+ if (AI != cu->getRelocMap()->end()) {
+ const std::pair<uint8_t, int64_t> &R = AI->second;
+ Value.uval = data.getU32(offset_ptr) + R.second;
+ } else
Value.uval = data.getU32(offset_ptr);
- else
- Value.uval = data.getU64(offset_ptr);
break;
+ }
case DW_FORM_flag_present:
Value.uval = 1;
break;
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;
if (is_block) {
StringRef str = data.getData().substr(*offset_ptr, Value.uval);
- Value.data = NULL;
+ Value.data = nullptr;
if (!str.empty()) {
Value.data = reinterpret_cast<const uint8_t *>(str.data());
*offset_ptr += Value.uval;
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 {
- indirect = false;
switch (form) {
// Blocks if inlined data that have a length field and the data bytes
// inlined in the .debug_info
// Compile unit address sized values
case DW_FORM_addr:
- case DW_FORM_ref_addr:
*offset_ptr += cu->getAddressByteSize();
return true;
+ case DW_FORM_ref_addr:
+ *offset_ptr += getRefAddrSize(cu->getAddressByteSize(), cu->getVersion());
+ return true;
// 0 byte values - implied from the form.
case DW_FORM_flag_present:
return true;
-
+
// 1 byte values
case DW_FORM_data1:
case DW_FORM_flag:
form = debug_info_data.getULEB128(offset_ptr);
break;
- // 4 for DWARF32, 8 for DWARF64.
+ // FIXME: 4 for DWARF32, 8 for DWARF64.
case DW_FORM_sec_offset:
- if (cu->getAddressByteSize() == 4)
- *offset_ptr += 4;
- else
- *offset_ptr += 8;
+ *offset_ptr += 4;
return true;
-
+
default:
return false;
}
}
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: {
+ OS << format(" indexed (%8.8x) address = ", (uint32_t)uvalue);
+ uint64_t Address;
+ if (cu->getAddrOffsetSectionItem(uvalue, Address))
+ OS << format("0x%016" PRIx64, Address);
+ else
+ OS << "<no .debug_addr section>";
+ break;
+ }
case DW_FORM_flag_present: OS << "true"; break;
case DW_FORM_flag:
case DW_FORM_data1: OS << format("0x%02x", (uint8_t)uvalue); break;
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:
}
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;
OS << "DW_FORM_indirect";
break;
+ // Should be formatted to 64-bit for DWARF64.
case DW_FORM_sec_offset:
- if (cu->getAddressByteSize() == 4)
- OS << format("0x%08x", (uint32_t)uvalue);
- else
- OS << format("0x%016" PRIx64, uvalue);
+ OS << format("0x%08x", (uint32_t)uvalue);
break;
-
+
default:
OS << format("DW_FORM(0x%4.4x)", Form);
break;
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)
+ 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->getULEB128(&offset);
- return DS->getCStr(&soffset);
+ 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 || !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)
+ 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;
+Optional<uint64_t> DWARFFormValue::getAsUnsignedConstant() const {
+ if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag))
+ || Form == DW_FORM_sdata)
+ return None;
+ return Value.uval;
}
-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<ArrayRef<uint8_t>> DWARFFormValue::getAsBlock() const {
+ if (!isFormClass(FC_Block) && !isFormClass(FC_Exprloc))
+ return None;
+ return ArrayRef<uint8_t>(Value.data, Value.uval);
}
+
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