Optional<uint64_t> getAsAddress() const;
Optional<uint64_t> getAsSectionOffset() const;
Optional<ArrayRef<uint8_t>> getAsBlock() const;
+ /// Get the fixed byte size for a given form.
+ ///
+ /// If the form always has a fixed valid byte size that doesn't depend on a
+ /// DWARFUnit, then an Optional with a value will be returned. If the form
+ /// can vary in size depending on the DWARFUnit (DWARF version, address byte
+ /// size, or DWARF 32/64) and the DWARFUnit is valid, then an Optional with a
+ /// valid value is returned. If the form is always encoded using a variable
+ /// length storage format (ULEB or SLEB numbers or blocks) or the size
+ /// depends on a DWARFUnit and the DWARFUnit is NULL, then None will be
+ /// returned.
+ /// \param Form The DWARF form to get the fixed byte size for
+ /// \param U The DWARFUnit that can be used to help determine the byte size.
+ ///
+ /// \returns Optional<uint8_t> value with the fixed byte size or None if
+ /// \p Form doesn't have a fixed byte size or a DWARFUnit wasn't supplied
+ /// and was needed to calculate the byte size.
+ static Optional<uint8_t> getFixedByteSize(dwarf::Form Form,
+ const DWARFUnit *U = nullptr);
+ /// Get the fixed byte size for a given form.
+ ///
+ /// If the form has a fixed byte size given a valid DWARF version and address
+ /// byte size, then an Optional with a valid value is returned. If the form
+ /// is always encoded using a variable length storage format (ULEB or SLEB
+ /// numbers or blocks) then None will be returned.
+ ///
+ /// \param Form DWARF form to get the fixed byte size for
+ /// \param Version DWARF version number.
+ /// \param AddrSize size of an address in bytes.
+ /// \param Format enum value from llvm::dwarf::DwarfFormat.
+ /// \returns Optional<uint8_t> value with the fixed byte size or None if
+ /// \p Form doesn't have a fixed byte size.
+ static Optional<uint8_t> getFixedByteSize(dwarf::Form Form, uint16_t Version,
+ uint8_t AddrSize,
+ llvm::dwarf::DwarfFormat Format);
+ /// Skip a form in \p debug_info_data at offset specified by \p offset_ptr.
+ ///
+ /// Skips the bytes for this form in the debug info and updates the offset.
+ ///
+ /// \param debug_info_data the .debug_info data to use to skip the value.
+ /// \param offset_ptr a reference to the offset that will be updated.
+ /// \param U the DWARFUnit to use when skipping the form in case the form
+ /// size differs according to data in the DWARFUnit.
+ /// \returns true on success, false if the form was not skipped.
bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr,
const DWARFUnit *U) const;
+ /// Skip a form in \p debug_info_data at offset specified by \p offset_ptr.
+ ///
+ /// Skips the bytes for this form in the debug info and updates the offset.
+ ///
+ /// \param form the DW_FORM enumeration that indicates the form to skip.
+ /// \param debug_info_data the .debug_info data to use to skip the value.
+ /// \param offset_ptr a reference to the offset that will be updated.
+ /// \param U the DWARFUnit to use when skipping the form in case the form
+ /// size differs according to data in the DWARFUnit.
+ /// \returns true on success, false if the form was not skipped.
static bool skipValue(dwarf::Form form, DataExtractor debug_info_data,
- uint32_t *offset_ptr, const DWARFUnit *u);
+ uint32_t *offset_ptr, const DWARFUnit *U);
+ /// Skip a form in \p debug_info_data at offset specified by \p offset_ptr.
+ ///
+ /// Skips the bytes for this form in the debug info and updates the offset.
+ ///
+ /// \param form the DW_FORM enumeration that indicates the form to skip.
+ /// \param debug_info_data the .debug_info data to use to skip the value.
+ /// \param offset_ptr a reference to the offset that will be updated.
+ /// \param Version DWARF version number.
+ /// \param AddrSize size of an address in bytes.
+ /// \param Format enum value from llvm::dwarf::DwarfFormat.
+ /// \returns true on success, false if the form was not skipped.
static bool skipValue(dwarf::Form form, DataExtractor debug_info_data,
uint32_t *offset_ptr, uint16_t Version,
- uint8_t AddrSize);
+ uint8_t AddrSize, llvm::dwarf::DwarfFormat Format);
- static ArrayRef<uint8_t> getFixedFormSizes(uint8_t AddrSize,
- uint16_t Version);
private:
void dumpString(raw_ostream &OS) const;
};
using namespace dwarf;
using namespace syntax;
-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);
-}
-}
-
-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_Flag, // 0x19 DW_FORM_flag_present
};
+namespace {
+
+/// A helper class that can be used in DWARFFormValue.cpp functions that need
+/// to know the byte size of DW_FORM values that vary in size depending on the
+/// DWARF version, address byte size, or DWARF32 or DWARF64.
+class FormSizeHelper {
+ uint16_t Version;
+ uint8_t AddrSize;
+ llvm::dwarf::DwarfFormat Format;
+
+public:
+ FormSizeHelper(uint16_t V, uint8_t A, llvm::dwarf::DwarfFormat F)
+ : Version(V), AddrSize(A), Format(F) {}
+ uint8_t getAddressByteSize() const { return AddrSize; }
+ uint8_t getRefAddrByteSize() const {
+ if (Version == 2)
+ return AddrSize;
+ return getDwarfOffsetByteSize();
+ }
+ uint8_t getDwarfOffsetByteSize() const {
+ switch (Format) {
+ case dwarf::DwarfFormat::DWARF32:
+ return 4;
+ case dwarf::DwarfFormat::DWARF64:
+ return 8;
+ }
+ llvm_unreachable("Invalid Format value");
+ }
+};
+
+} // end anonymous namespace
+
+template <class T>
+static Optional<uint8_t> getFixedByteSize(dwarf::Form Form, const T *U) {
+ switch (Form) {
+ case DW_FORM_addr:
+ if (U)
+ return U->getAddressByteSize();
+ return None;
+
+ case DW_FORM_block: // ULEB128 length L followed by L bytes.
+ case DW_FORM_block1: // 1 byte length L followed by L bytes.
+ case DW_FORM_block2: // 2 byte length L followed by L bytes.
+ case DW_FORM_block4: // 4 byte length L followed by L bytes.
+ case DW_FORM_string: // C-string with null terminator.
+ case DW_FORM_sdata: // SLEB128.
+ case DW_FORM_udata: // ULEB128.
+ case DW_FORM_ref_udata: // ULEB128.
+ case DW_FORM_indirect: // ULEB128.
+ case DW_FORM_exprloc: // ULEB128 length L followed by L bytes.
+ case DW_FORM_strx: // ULEB128.
+ case DW_FORM_addrx: // ULEB128.
+ case DW_FORM_loclistx: // ULEB128.
+ case DW_FORM_rnglistx: // ULEB128.
+ case DW_FORM_GNU_addr_index: // ULEB128.
+ case DW_FORM_GNU_str_index: // ULEB128.
+ return None;
+
+ case DW_FORM_ref_addr:
+ if (U)
+ return U->getRefAddrByteSize();
+ return None;
+
+ case DW_FORM_flag:
+ case DW_FORM_data1:
+ case DW_FORM_ref1:
+ return 1;
+
+ case DW_FORM_data2:
+ case DW_FORM_ref2:
+ return 2;
+
+ case DW_FORM_data4:
+ case DW_FORM_ref4:
+ case DW_FORM_strp:
+ return 4;
+
+ case DW_FORM_GNU_ref_alt:
+ case DW_FORM_GNU_strp_alt:
+ case DW_FORM_line_strp:
+ case DW_FORM_sec_offset:
+ case DW_FORM_strp_sup:
+ case DW_FORM_ref_sup:
+ if (U)
+ return U->getDwarfOffsetByteSize();
+ return None;
+
+ case DW_FORM_data8:
+ case DW_FORM_ref8:
+ case DW_FORM_ref_sig8:
+ return 8;
+
+ case DW_FORM_flag_present:
+ return 0;
+
+ case DW_FORM_data16:
+ return 16;
+
+ case DW_FORM_implicit_const:
+ // The implicit value is stored in the abbreviation as a ULEB128, any
+ // there no data in debug info.
+ return 0;
+
+ default:
+ llvm_unreachable("Handle this form in this switch statement");
+ }
+ return None;
+}
+
+template <class T>
+static bool skipFormValue(dwarf::Form Form, const DataExtractor &DebugInfoData,
+ uint32_t *OffsetPtr, const T *U) {
+ bool Indirect = false;
+ do {
+ switch (Form) {
+ // Blocks if inlined data that have a length field and the data bytes
+ // inlined in the .debug_info.
+ case DW_FORM_exprloc:
+ case DW_FORM_block: {
+ uint64_t size = DebugInfoData.getULEB128(OffsetPtr);
+ *OffsetPtr += size;
+ return true;
+ }
+ case DW_FORM_block1: {
+ uint8_t size = DebugInfoData.getU8(OffsetPtr);
+ *OffsetPtr += size;
+ return true;
+ }
+ case DW_FORM_block2: {
+ uint16_t size = DebugInfoData.getU16(OffsetPtr);
+ *OffsetPtr += size;
+ return true;
+ }
+ case DW_FORM_block4: {
+ uint32_t size = DebugInfoData.getU32(OffsetPtr);
+ *OffsetPtr += size;
+ return true;
+ }
+
+ // Inlined NULL terminated C-strings.
+ case DW_FORM_string:
+ DebugInfoData.getCStr(OffsetPtr);
+ return true;
+
+ case DW_FORM_addr:
+ case DW_FORM_ref_addr:
+ case DW_FORM_flag_present:
+ case DW_FORM_data1:
+ case DW_FORM_data2:
+ case DW_FORM_data4:
+ case DW_FORM_data8:
+ case DW_FORM_flag:
+ case DW_FORM_ref1:
+ case DW_FORM_ref2:
+ case DW_FORM_ref4:
+ case DW_FORM_ref8:
+ case DW_FORM_ref_sig8:
+ case DW_FORM_sec_offset:
+ case DW_FORM_strp:
+ case DW_FORM_GNU_ref_alt:
+ case DW_FORM_GNU_strp_alt:
+ if (Optional<uint8_t> FixedSize = ::getFixedByteSize(Form, U)) {
+ *OffsetPtr += *FixedSize;
+ return true;
+ }
+ return false;
+
+ // signed or unsigned LEB 128 values.
+ case DW_FORM_sdata:
+ DebugInfoData.getSLEB128(OffsetPtr);
+ return true;
+
+ case DW_FORM_udata:
+ case DW_FORM_ref_udata:
+ case DW_FORM_strx:
+ case DW_FORM_addrx:
+ case DW_FORM_loclistx:
+ case DW_FORM_rnglistx:
+ case DW_FORM_GNU_addr_index:
+ case DW_FORM_GNU_str_index:
+ DebugInfoData.getULEB128(OffsetPtr);
+ return true;
+
+ case DW_FORM_indirect:
+ Indirect = true;
+ Form = static_cast<dwarf::Form>(DebugInfoData.getULEB128(OffsetPtr));
+ break;
+
+ default:
+ return false;
+ }
+ } while (Indirect);
+ return true;
+}
+
+Optional<uint8_t> DWARFFormValue::getFixedByteSize(dwarf::Form Form,
+ const DWARFUnit *U) {
+ return ::getFixedByteSize(Form, U);
+}
+
+Optional<uint8_t>
+DWARFFormValue::getFixedByteSize(dwarf::Form Form, uint16_t Version,
+ uint8_t AddrSize,
+ llvm::dwarf::DwarfFormat Format) {
+ FormSizeHelper FSH(Version, AddrSize, Format);
+ return ::getFixedByteSize(Form, &FSH);
+}
+
bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const {
// First, check DWARF4 form classes.
if (Form < makeArrayRef(DWARF4FormClasses).size() &&
: U->getRefAddrByteSize();
RelocAddrMap::const_iterator AI = U->getRelocMap()->find(*offset_ptr);
if (AI != U->getRelocMap()->end()) {
- const std::pair<uint8_t, int64_t> &R = AI->second;
- Value.uval = data.getUnsigned(offset_ptr, AddrSize) + R.second;
+ Value.uval = data.getUnsigned(offset_ptr, AddrSize) + AI->second.second;
} else
Value.uval = data.getUnsigned(offset_ptr, AddrSize);
break;
Value.uval = data.getU16(offset_ptr);
break;
case DW_FORM_data4:
- case DW_FORM_ref4: {
+ case DW_FORM_ref4:
+ case DW_FORM_strp: {
Value.uval = data.getU32(offset_ptr);
if (!U)
break;
indirect = true;
break;
case DW_FORM_sec_offset:
- case DW_FORM_strp:
case DW_FORM_GNU_ref_alt:
- case DW_FORM_GNU_strp_alt: {
- // FIXME: This is 64-bit for DWARF64.
- Value.uval = data.getU32(offset_ptr);
+ case DW_FORM_GNU_strp_alt:
+ case DW_FORM_line_strp:
+ case DW_FORM_strp_sup:
+ case DW_FORM_ref_sup: {
if (!U)
- break;
- RelocAddrMap::const_iterator AI =
- U->getRelocMap()->find(*offset_ptr - 4);
+ return false;
+ RelocAddrMap::const_iterator AI = U->getRelocMap()->find(*offset_ptr);
+ uint8_t Size = U->getDwarfOffsetByteSize();
+ Value.uval = data.getUnsigned(offset_ptr, Size);
if (AI != U->getRelocMap()->end())
Value.uval += AI->second.second;
break;
return true;
}
-bool
-DWARFFormValue::skipValue(DataExtractor debug_info_data, uint32_t* offset_ptr,
- const DWARFUnit *U) const {
- return DWARFFormValue::skipValue(Form, debug_info_data, offset_ptr, U);
+bool DWARFFormValue::skipValue(DataExtractor DebugInfoData,
+ uint32_t *offset_ptr, const DWARFUnit *U) const {
+ return DWARFFormValue::skipValue(Form, DebugInfoData, offset_ptr, U);
}
-bool
-DWARFFormValue::skipValue(dwarf::Form form, DataExtractor debug_info_data,
- uint32_t *offset_ptr, const DWARFUnit *cu) {
- return skipValue(form, debug_info_data, offset_ptr, cu->getVersion(),
- cu->getAddressByteSize());
+bool DWARFFormValue::skipValue(dwarf::Form form, DataExtractor DebugInfoData,
+ uint32_t *offset_ptr, const DWARFUnit *U) {
+ return skipFormValue(form, DebugInfoData, offset_ptr, U);
}
-bool
-DWARFFormValue::skipValue(dwarf::Form form, DataExtractor debug_info_data,
- uint32_t *offset_ptr, uint16_t Version,
- uint8_t AddrSize) {
- bool indirect = false;
- do {
- switch (form) {
- // Blocks if inlined data that have a length field and the data bytes
- // inlined in the .debug_info
- case DW_FORM_exprloc:
- case DW_FORM_block: {
- uint64_t size = debug_info_data.getULEB128(offset_ptr);
- *offset_ptr += size;
- return true;
- }
- case DW_FORM_block1: {
- uint8_t size = debug_info_data.getU8(offset_ptr);
- *offset_ptr += size;
- return true;
- }
- case DW_FORM_block2: {
- uint16_t size = debug_info_data.getU16(offset_ptr);
- *offset_ptr += size;
- return true;
- }
- case DW_FORM_block4: {
- uint32_t size = debug_info_data.getU32(offset_ptr);
- *offset_ptr += size;
- return true;
- }
-
- // Inlined NULL terminated C-strings
- case DW_FORM_string:
- debug_info_data.getCStr(offset_ptr);
- return true;
-
- // Compile unit address sized values
- case DW_FORM_addr:
- *offset_ptr += AddrSize;
- return true;
- case DW_FORM_ref_addr:
- *offset_ptr += getRefAddrSize(AddrSize, Version);
- 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:
- case DW_FORM_ref1:
- *offset_ptr += 1;
- return true;
-
- // 2 byte values
- case DW_FORM_data2:
- case DW_FORM_ref2:
- *offset_ptr += 2;
- return true;
-
- // 4 byte values
- case DW_FORM_data4:
- case DW_FORM_ref4:
- *offset_ptr += 4;
- return true;
-
- // 8 byte values
- case DW_FORM_data8:
- case DW_FORM_ref8:
- case DW_FORM_ref_sig8:
- *offset_ptr += 8;
- return true;
-
- // signed or unsigned LEB 128 values
- // case DW_FORM_APPLE_db_str:
- case DW_FORM_sdata:
- case DW_FORM_udata:
- case DW_FORM_ref_udata:
- case DW_FORM_GNU_str_index:
- case DW_FORM_GNU_addr_index:
- debug_info_data.getULEB128(offset_ptr);
- return true;
- case DW_FORM_indirect:
- indirect = true;
- form = static_cast<dwarf::Form>(debug_info_data.getULEB128(offset_ptr));
- break;
-
- // FIXME: 4 for DWARF32, 8 for DWARF64.
- case DW_FORM_sec_offset:
- case DW_FORM_strp:
- case DW_FORM_GNU_ref_alt:
- case DW_FORM_GNU_strp_alt:
- *offset_ptr += 4;
- return true;
-
- default:
- return false;
- }
- } while (indirect);
- return true;
+bool DWARFFormValue::skipValue(dwarf::Form form, DataExtractor DebugInfoData,
+ uint32_t *offset_ptr, uint16_t Version,
+ uint8_t AddrSize,
+ llvm::dwarf::DwarfFormat Format) {
+ FormSizeHelper FSH(Version, AddrSize, Format);
+ return skipFormValue(form, DebugInfoData, offset_ptr, &FSH);
}
void
return None;
return Value.uval + U->getOffset();
case DW_FORM_ref_addr:
+ case DW_FORM_ref_sig8:
+ case DW_FORM_GNU_ref_alt:
return Value.uval;
- // FIXME: Add proper support for DW_FORM_ref_sig8 and DW_FORM_GNU_ref_alt.
default:
return None;
}
namespace {
TEST(DWARFFormValue, FixedFormSizes) {
- // Size of DW_FORM_addr and DW_FORM_ref_addr are equal in DWARF2,
- // DW_FORM_ref_addr is always 4 bytes in DWARF32 starting from DWARF3.
- ArrayRef<uint8_t> sizes = DWARFFormValue::getFixedFormSizes(4, 2);
- EXPECT_EQ(sizes[DW_FORM_addr], sizes[DW_FORM_ref_addr]);
- sizes = DWARFFormValue::getFixedFormSizes(8, 2);
- EXPECT_EQ(sizes[DW_FORM_addr], sizes[DW_FORM_ref_addr]);
- sizes = DWARFFormValue::getFixedFormSizes(8, 3);
- EXPECT_EQ(4, sizes[DW_FORM_ref_addr]);
- // Check that we don't have fixed form sizes for weird address sizes.
- EXPECT_EQ(0U, DWARFFormValue::getFixedFormSizes(16, 2).size());
+ Optional<uint8_t> RefSize;
+ Optional<uint8_t> AddrSize;
+ // Test 32 bit DWARF version 2 with 4 byte addresses.
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 2, 4, DWARF32);
+ AddrSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 2, 4, DWARF32);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_TRUE(AddrSize.hasValue());
+ EXPECT_EQ(*RefSize, *AddrSize);
+
+ // Test 32 bit DWARF version 2 with 8 byte addresses.
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 2, 8, DWARF32);
+ AddrSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 2, 8, DWARF32);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_TRUE(AddrSize.hasValue());
+ EXPECT_EQ(*RefSize, *AddrSize);
+
+ // DW_FORM_ref_addr is 4 bytes in DWARF 32 in DWARF version 3 and beyond.
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 3, 4, DWARF32);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_EQ(*RefSize, 4);
+
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 4, 4, DWARF32);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_EQ(*RefSize, 4);
+
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 5, 4, DWARF32);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_EQ(*RefSize, 4);
+
+ // DW_FORM_ref_addr is 8 bytes in DWARF 64 in DWARF version 3 and beyond.
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 3, 8, DWARF64);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_EQ(*RefSize, 8);
+
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 4, 8, DWARF64);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_EQ(*RefSize, 8);
+
+ RefSize = DWARFFormValue::getFixedByteSize(DW_FORM_ref_addr, 5, 8, DWARF64);
+ EXPECT_TRUE(RefSize.hasValue());
+ EXPECT_EQ(*RefSize, 8);
}
bool isFormClass(dwarf::Form Form, DWARFFormValue::FormClass FC) {
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