| //===-- DWARFFormValue.cpp --------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include <assert.h> |
| |
| #include "lldb/Core/dwarf.h" |
| #include "lldb/Core/Stream.h" |
| |
| #include "DWARFFormValue.h" |
| #include "DWARFCompileUnit.h" |
| |
| class DWARFCompileUnit; |
| |
| using namespace lldb_private; |
| |
| |
| static uint8_t g_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 |
| 0, // 0x10 DW_FORM_ref_addr (addr size for DWARF2 and earlier, 4 bytes for DWARF32, 8 bytes for DWARF32 in DWARF 3 and later |
| 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 |
| 0, // 0x1a |
| 0, // 0x1b |
| 0, // 0x1c |
| 0, // 0x1d |
| 0, // 0x1e |
| 0, // 0x1f |
| 8, // 0x20 DW_FORM_ref_sig8 |
| |
| }; |
| |
| static uint8_t |
| g_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 |
| 0, // 0x10 DW_FORM_ref_addr (addr size for DWARF2 and earlier, 4 bytes for DWARF32, 8 bytes for DWARF32 in DWARF 3 and later |
| 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 |
| 0, // 0x1a |
| 0, // 0x1b |
| 0, // 0x1c |
| 0, // 0x1d |
| 0, // 0x1e |
| 0, // 0x1f |
| 8, // 0x20 DW_FORM_ref_sig8 |
| }; |
| |
| const uint8_t * |
| DWARFFormValue::GetFixedFormSizesForAddressSize (uint8_t addr_size) |
| { |
| switch (addr_size) |
| { |
| case 4: return g_form_sizes_addr4; |
| case 8: return g_form_sizes_addr8; |
| } |
| return NULL; |
| } |
| |
| DWARFFormValue::DWARFFormValue(dw_form_t form) : |
| m_form(form), |
| m_value() |
| { |
| } |
| |
| bool |
| DWARFFormValue::ExtractValue(const DWARFDataExtractor& data, lldb::offset_t* offset_ptr, const DWARFCompileUnit* cu) |
| { |
| bool indirect = false; |
| bool is_block = false; |
| m_value.data = NULL; |
| // Read the value for the form into value and follow and DW_FORM_indirect instances we run into |
| do |
| { |
| indirect = false; |
| switch (m_form) |
| { |
| case DW_FORM_addr: m_value.value.uval = data.GetMaxU64(offset_ptr, DWARFCompileUnit::GetAddressByteSize(cu)); break; |
| case DW_FORM_block2: m_value.value.uval = data.GetU16(offset_ptr); is_block = true; break; |
| case DW_FORM_block4: m_value.value.uval = data.GetU32(offset_ptr); is_block = true; break; |
| case DW_FORM_data2: m_value.value.uval = data.GetU16(offset_ptr); break; |
| case DW_FORM_data4: m_value.value.uval = data.GetU32(offset_ptr); break; |
| case DW_FORM_data8: m_value.value.uval = data.GetU64(offset_ptr); break; |
| case DW_FORM_string: m_value.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 difference between DW_FORM_string and DW_FORM_strp form |
| // values; |
| m_value.data = (uint8_t*)m_value.value.cstr; break; |
| case DW_FORM_exprloc: |
| case DW_FORM_block: m_value.value.uval = data.GetULEB128(offset_ptr); is_block = true; break; |
| case DW_FORM_block1: m_value.value.uval = data.GetU8(offset_ptr); is_block = true; break; |
| case DW_FORM_data1: m_value.value.uval = data.GetU8(offset_ptr); break; |
| case DW_FORM_flag: m_value.value.uval = data.GetU8(offset_ptr); break; |
| case DW_FORM_sdata: m_value.value.sval = data.GetSLEB128(offset_ptr); break; |
| case DW_FORM_strp: m_value.value.uval = data.GetU32(offset_ptr); break; |
| // case DW_FORM_APPLE_db_str: |
| case DW_FORM_udata: m_value.value.uval = data.GetULEB128(offset_ptr); break; |
| case DW_FORM_ref_addr: |
| if (cu->GetVersion() <= 2) |
| m_value.value.uval = data.GetMaxU64(offset_ptr, DWARFCompileUnit::GetAddressByteSize(cu)); |
| else |
| m_value.value.uval = data.GetU32(offset_ptr); // 4 for DWARF32, 8 for DWARF64, but we don't support DWARF64 yet |
| break; |
| case DW_FORM_ref1: m_value.value.uval = data.GetU8(offset_ptr); break; |
| case DW_FORM_ref2: m_value.value.uval = data.GetU16(offset_ptr); break; |
| case DW_FORM_ref4: m_value.value.uval = data.GetU32(offset_ptr); break; |
| case DW_FORM_ref8: m_value.value.uval = data.GetU64(offset_ptr); break; |
| case DW_FORM_ref_udata: m_value.value.uval = data.GetULEB128(offset_ptr); break; |
| case DW_FORM_indirect: |
| m_form = data.GetULEB128(offset_ptr); |
| indirect = true; |
| break; |
| |
| case DW_FORM_sec_offset: m_value.value.uval = data.GetU32(offset_ptr); break; |
| case DW_FORM_flag_present: m_value.value.uval = 1; break; |
| case DW_FORM_ref_sig8: m_value.value.uval = data.GetU64(offset_ptr); break; |
| default: |
| return false; |
| break; |
| } |
| } while (indirect); |
| |
| if (is_block) |
| { |
| m_value.data = data.PeekData(*offset_ptr, m_value.value.uval); |
| if (m_value.data != NULL) |
| { |
| *offset_ptr += m_value.value.uval; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool |
| DWARFFormValue::SkipValue(const DWARFDataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu) const |
| { |
| return DWARFFormValue::SkipValue(m_form, debug_info_data, offset_ptr, cu); |
| } |
| |
| bool |
| DWARFFormValue::SkipValue(dw_form_t form, const DWARFDataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu) |
| { |
| 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: { dw_uleb128_t size = debug_info_data.GetULEB128(offset_ptr); *offset_ptr += size; } return true; |
| case DW_FORM_block1: { dw_uleb128_t size = debug_info_data.GetU8(offset_ptr); *offset_ptr += size; } return true; |
| case DW_FORM_block2: { dw_uleb128_t size = debug_info_data.GetU16(offset_ptr); *offset_ptr += size; } return true; |
| case DW_FORM_block4: { dw_uleb128_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 += DWARFCompileUnit::GetAddressByteSize(cu); |
| return true; |
| |
| case DW_FORM_ref_addr: |
| if (cu->GetVersion() <= 2) |
| *offset_ptr += DWARFCompileUnit::GetAddressByteSize(cu); |
| else |
| *offset_ptr += 4;// 4 for DWARF32, 8 for DWARF64, but we don't support DWARF64 yet |
| return true; |
| |
| // 0 bytes values (implied from DW_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; |
| |
| // 32 bit for DWARF 32, 64 for DWARF 64 |
| case DW_FORM_sec_offset: |
| *offset_ptr += 4; |
| return true; |
| |
| // 4 byte values |
| case DW_FORM_strp: |
| 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_sdata: |
| case DW_FORM_udata: |
| case DW_FORM_ref_udata: |
| debug_info_data.Skip_LEB128(offset_ptr); |
| return true; |
| |
| case DW_FORM_indirect: |
| { |
| dw_form_t indirect_form = debug_info_data.GetULEB128(offset_ptr); |
| return DWARFFormValue::SkipValue (indirect_form, |
| debug_info_data, |
| offset_ptr, |
| cu); |
| } |
| |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| |
| void |
| DWARFFormValue::Dump(Stream &s, const DWARFDataExtractor* debug_str_data, const DWARFCompileUnit* cu) const |
| { |
| uint64_t uvalue = Unsigned(); |
| bool cu_relative_offset = false; |
| |
| bool verbose = s.GetVerbose(); |
| |
| switch (m_form) |
| { |
| case DW_FORM_addr: s.Address(uvalue, sizeof (uint64_t)); break; |
| case DW_FORM_flag: |
| case DW_FORM_data1: s.PutHex8(uvalue); break; |
| case DW_FORM_data2: s.PutHex16(uvalue); break; |
| case DW_FORM_sec_offset: |
| case DW_FORM_data4: s.PutHex32(uvalue); break; |
| case DW_FORM_ref_sig8: |
| case DW_FORM_data8: s.PutHex64(uvalue); break; |
| case DW_FORM_string: s.QuotedCString(AsCString(NULL)); break; |
| case DW_FORM_exprloc: |
| case DW_FORM_block: |
| case DW_FORM_block1: |
| case DW_FORM_block2: |
| case DW_FORM_block4: |
| if (uvalue > 0) |
| { |
| switch (m_form) |
| { |
| case DW_FORM_exprloc: |
| case DW_FORM_block: s.Printf("<0x%" PRIx64 "> ", uvalue); break; |
| case DW_FORM_block1: s.Printf("<0x%2.2x> ", (uint8_t)uvalue); break; |
| case DW_FORM_block2: s.Printf("<0x%4.4x> ", (uint16_t)uvalue); break; |
| case DW_FORM_block4: s.Printf("<0x%8.8x> ", (uint32_t)uvalue); break; |
| default: break; |
| } |
| |
| const uint8_t* data_ptr = m_value.data; |
| if (data_ptr) |
| { |
| const uint8_t* end_data_ptr = data_ptr + uvalue; // uvalue contains size of block |
| while (data_ptr < end_data_ptr) |
| { |
| s.Printf("%2.2x ", *data_ptr); |
| ++data_ptr; |
| } |
| } |
| else |
| s.PutCString("NULL"); |
| } |
| break; |
| |
| case DW_FORM_sdata: s.PutSLEB128(uvalue); break; |
| case DW_FORM_udata: s.PutULEB128(uvalue); break; |
| case DW_FORM_strp: |
| if (debug_str_data) |
| { |
| if (verbose) |
| s.Printf(" .debug_str[0x%8.8x] = ", (uint32_t)uvalue); |
| |
| const char* dbg_str = AsCString(debug_str_data); |
| if (dbg_str) |
| s.QuotedCString(dbg_str); |
| } |
| else |
| { |
| s.PutHex32(uvalue); |
| } |
| break; |
| |
| case DW_FORM_ref_addr: |
| { |
| if (cu->GetVersion() <= 2) |
| s.Address(uvalue, sizeof (uint64_t) * 2); |
| else |
| s.Address(uvalue, 4 * 2);// 4 for DWARF32, 8 for DWARF64, but we don't support DWARF64 yet |
| break; |
| } |
| case DW_FORM_ref1: cu_relative_offset = true; if (verbose) s.Printf("cu + 0x%2.2x", (uint8_t)uvalue); break; |
| case DW_FORM_ref2: cu_relative_offset = true; if (verbose) s.Printf("cu + 0x%4.4x", (uint16_t)uvalue); break; |
| case DW_FORM_ref4: cu_relative_offset = true; if (verbose) s.Printf("cu + 0x%4.4x", (uint32_t)uvalue); break; |
| case DW_FORM_ref8: cu_relative_offset = true; if (verbose) s.Printf("cu + 0x%8.8" PRIx64, uvalue); break; |
| case DW_FORM_ref_udata: cu_relative_offset = true; if (verbose) s.Printf("cu + 0x%" PRIx64, uvalue); break; |
| |
| // All DW_FORM_indirect attributes should be resolved prior to calling this function |
| case DW_FORM_indirect: s.PutCString("DW_FORM_indirect"); break; |
| case DW_FORM_flag_present: break; |
| default: |
| s.Printf("DW_FORM(0x%4.4x)", m_form); |
| break; |
| } |
| |
| if (cu_relative_offset) |
| { |
| if (verbose) |
| s.PutCString(" => "); |
| |
| s.Printf("{0x%8.8" PRIx64 "}", (uvalue + (cu ? cu->GetOffset() : 0))); |
| } |
| } |
| |
| const char* |
| DWARFFormValue::AsCString(const DWARFDataExtractor* debug_str_data_ptr) const |
| { |
| if (IsInlinedCStr()) |
| return m_value.value.cstr; |
| else if (debug_str_data_ptr) |
| return debug_str_data_ptr->PeekCStr(m_value.value.uval); |
| return NULL; |
| } |
| |
| uint64_t |
| DWARFFormValue::Reference(const DWARFCompileUnit* cu) const |
| { |
| uint64_t die_offset = m_value.value.uval; |
| switch (m_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; |
| } |
| |
| return die_offset; |
| } |
| |
| uint64_t |
| DWARFFormValue::Reference (dw_offset_t base_offset) const |
| { |
| uint64_t die_offset = m_value.value.uval; |
| switch (m_form) |
| { |
| case DW_FORM_ref1: |
| case DW_FORM_ref2: |
| case DW_FORM_ref4: |
| case DW_FORM_ref8: |
| case DW_FORM_ref_udata: |
| die_offset += base_offset; |
| break; |
| |
| default: |
| break; |
| } |
| |
| return die_offset; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Resolve any compile unit specific references so that we don't need |
| // the compile unit at a later time in order to work with the form |
| // value. |
| //---------------------------------------------------------------------- |
| bool |
| DWARFFormValue::ResolveCompileUnitReferences(const DWARFCompileUnit* cu) |
| { |
| switch (m_form) |
| { |
| case DW_FORM_ref1: |
| case DW_FORM_ref2: |
| case DW_FORM_ref4: |
| case DW_FORM_ref8: |
| case DW_FORM_ref_udata: |
| m_value.value.uval += cu->GetOffset(); |
| m_form = DW_FORM_ref_addr; |
| return true; |
| break; |
| |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| const uint8_t* |
| DWARFFormValue::BlockData() const |
| { |
| if (!IsInlinedCStr()) |
| return m_value.data; |
| return NULL; |
| } |
| |
| |
| bool |
| DWARFFormValue::IsBlockForm(const dw_form_t form) |
| { |
| switch (form) |
| { |
| case DW_FORM_block: |
| case DW_FORM_block1: |
| case DW_FORM_block2: |
| case DW_FORM_block4: |
| return true; |
| } |
| return false; |
| } |
| |
| bool |
| DWARFFormValue::IsDataForm(const dw_form_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; |
| } |
| |
| int |
| DWARFFormValue::Compare (const DWARFFormValue& a_value, const DWARFFormValue& b_value, const DWARFCompileUnit* a_cu, const DWARFCompileUnit* b_cu, const DWARFDataExtractor* debug_str_data_ptr) |
| { |
| dw_form_t a_form = a_value.Form(); |
| dw_form_t b_form = b_value.Form(); |
| if (a_form < b_form) |
| return -1; |
| if (a_form > b_form) |
| return 1; |
| switch (a_form) |
| { |
| case DW_FORM_addr: |
| case DW_FORM_flag: |
| case DW_FORM_data1: |
| case DW_FORM_data2: |
| case DW_FORM_data4: |
| case DW_FORM_data8: |
| case DW_FORM_udata: |
| case DW_FORM_ref_addr: |
| case DW_FORM_sec_offset: |
| case DW_FORM_flag_present: |
| case DW_FORM_ref_sig8: |
| { |
| uint64_t a = a_value.Unsigned(); |
| uint64_t b = b_value.Unsigned(); |
| if (a < b) |
| return -1; |
| if (a > b) |
| return 1; |
| return 0; |
| } |
| |
| case DW_FORM_sdata: |
| { |
| int64_t a = a_value.Signed(); |
| int64_t b = b_value.Signed(); |
| if (a < b) |
| return -1; |
| if (a > b) |
| return 1; |
| return 0; |
| } |
| |
| case DW_FORM_string: |
| case DW_FORM_strp: |
| { |
| const char *a_string = a_value.AsCString(debug_str_data_ptr); |
| const char *b_string = b_value.AsCString(debug_str_data_ptr); |
| if (a_string == b_string) |
| return 0; |
| else if (a_string && b_string) |
| return strcmp(a_string, b_string); |
| else if (a_string == NULL) |
| return -1; // A string is NULL, and B is valid |
| else |
| return 1; // A string valid, and B is NULL |
| } |
| |
| |
| case DW_FORM_block: |
| case DW_FORM_block1: |
| case DW_FORM_block2: |
| case DW_FORM_block4: |
| case DW_FORM_exprloc: |
| { |
| uint64_t a_len = a_value.Unsigned(); |
| uint64_t b_len = b_value.Unsigned(); |
| if (a_len < b_len) |
| return -1; |
| if (a_len > b_len) |
| return 1; |
| // The block lengths are the same |
| return memcmp(a_value.BlockData(), b_value.BlockData(), a_value.Unsigned()); |
| } |
| break; |
| |
| case DW_FORM_ref1: |
| case DW_FORM_ref2: |
| case DW_FORM_ref4: |
| case DW_FORM_ref8: |
| case DW_FORM_ref_udata: |
| { |
| uint64_t a = a_value.Reference(a_cu); |
| uint64_t b = b_value.Reference(b_cu); |
| if (a < b) |
| return -1; |
| if (a > b) |
| return 1; |
| return 0; |
| } |
| |
| case DW_FORM_indirect: |
| assert(!"This shouldn't happen after the form has been extracted..."); |
| break; |
| |
| default: |
| assert(!"Unhandled DW_FORM"); |
| break; |
| } |
| return -1; |
| } |
| |
