635 lines
16 KiB
C++
635 lines
16 KiB
C++
//===-- DWARFFormValue.cpp ------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <assert.h>
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#include "lldb/Core/Module.h"
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#include "lldb/Core/dwarf.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Utility/Stream.h"
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#include "DWARFDebugInfo.h"
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#include "DWARFFormValue.h"
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#include "DWARFUnit.h"
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class DWARFUnit;
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using namespace lldb_private;
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void DWARFFormValue::Clear() {
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m_unit = nullptr;
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m_form = 0;
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m_value = ValueTypeTag();
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}
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bool DWARFFormValue::ExtractValue(const DWARFDataExtractor &data,
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lldb::offset_t *offset_ptr) {
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if (m_form == DW_FORM_implicit_const)
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return true;
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bool indirect = false;
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bool is_block = false;
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m_value.data = nullptr;
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uint8_t ref_addr_size;
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// Read the value for the form into value and follow and DW_FORM_indirect
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// instances we run into
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do {
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indirect = false;
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switch (m_form) {
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case DW_FORM_addr:
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assert(m_unit);
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m_value.value.uval =
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data.GetMaxU64(offset_ptr, DWARFUnit::GetAddressByteSize(m_unit));
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break;
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case DW_FORM_block1:
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m_value.value.uval = data.GetU8(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_block2:
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m_value.value.uval = data.GetU16(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_block4:
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m_value.value.uval = data.GetU32(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_data16:
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m_value.value.uval = 16;
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is_block = true;
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break;
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case DW_FORM_exprloc:
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case DW_FORM_block:
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m_value.value.uval = data.GetULEB128(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_string:
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m_value.value.cstr = data.GetCStr(offset_ptr);
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break;
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case DW_FORM_sdata:
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m_value.value.sval = data.GetSLEB128(offset_ptr);
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break;
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case DW_FORM_strp:
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case DW_FORM_line_strp:
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case DW_FORM_sec_offset:
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m_value.value.uval = data.GetMaxU64(offset_ptr, 4);
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break;
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case DW_FORM_addrx1:
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case DW_FORM_strx1:
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case DW_FORM_ref1:
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case DW_FORM_data1:
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case DW_FORM_flag:
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m_value.value.uval = data.GetU8(offset_ptr);
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break;
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case DW_FORM_addrx2:
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case DW_FORM_strx2:
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case DW_FORM_ref2:
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case DW_FORM_data2:
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m_value.value.uval = data.GetU16(offset_ptr);
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break;
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case DW_FORM_addrx3:
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case DW_FORM_strx3:
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m_value.value.uval = data.GetMaxU64(offset_ptr, 3);
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break;
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case DW_FORM_addrx4:
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case DW_FORM_strx4:
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case DW_FORM_ref4:
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case DW_FORM_data4:
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m_value.value.uval = data.GetU32(offset_ptr);
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break;
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case DW_FORM_data8:
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case DW_FORM_ref8:
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case DW_FORM_ref_sig8:
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m_value.value.uval = data.GetU64(offset_ptr);
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break;
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case DW_FORM_addrx:
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case DW_FORM_loclistx:
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case DW_FORM_rnglistx:
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case DW_FORM_strx:
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case DW_FORM_udata:
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case DW_FORM_ref_udata:
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case DW_FORM_GNU_str_index:
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case DW_FORM_GNU_addr_index:
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m_value.value.uval = data.GetULEB128(offset_ptr);
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break;
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case DW_FORM_ref_addr:
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assert(m_unit);
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if (m_unit->GetVersion() <= 2)
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ref_addr_size = m_unit->GetAddressByteSize();
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else
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ref_addr_size = 4;
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m_value.value.uval = data.GetMaxU64(offset_ptr, ref_addr_size);
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break;
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case DW_FORM_indirect:
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m_form = data.GetULEB128(offset_ptr);
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indirect = true;
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break;
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case DW_FORM_flag_present:
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m_value.value.uval = 1;
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break;
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default:
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return false;
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}
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} while (indirect);
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if (is_block) {
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m_value.data = data.PeekData(*offset_ptr, m_value.value.uval);
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if (m_value.data != nullptr) {
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*offset_ptr += m_value.value.uval;
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}
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}
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return true;
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}
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struct FormSize {
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uint8_t valid:1, size:7;
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};
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static FormSize g_form_sizes[] = {
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{0,0}, // 0x00 unused
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{0,0}, // 0x01 DW_FORM_addr
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{0,0}, // 0x02 unused
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{0,0}, // 0x03 DW_FORM_block2
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{0,0}, // 0x04 DW_FORM_block4
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{1,2}, // 0x05 DW_FORM_data2
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{1,4}, // 0x06 DW_FORM_data4
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{1,8}, // 0x07 DW_FORM_data8
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{0,0}, // 0x08 DW_FORM_string
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{0,0}, // 0x09 DW_FORM_block
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{0,0}, // 0x0a DW_FORM_block1
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{1,1}, // 0x0b DW_FORM_data1
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{1,1}, // 0x0c DW_FORM_flag
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{0,0}, // 0x0d DW_FORM_sdata
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{1,4}, // 0x0e DW_FORM_strp
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{0,0}, // 0x0f DW_FORM_udata
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{0,0}, // 0x10 DW_FORM_ref_addr (addr size for DWARF2 and earlier, 4 bytes for
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// DWARF32, 8 bytes for DWARF32 in DWARF 3 and later
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{1,1}, // 0x11 DW_FORM_ref1
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{1,2}, // 0x12 DW_FORM_ref2
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{1,4}, // 0x13 DW_FORM_ref4
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{1,8}, // 0x14 DW_FORM_ref8
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{0,0}, // 0x15 DW_FORM_ref_udata
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{0,0}, // 0x16 DW_FORM_indirect
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{1,4}, // 0x17 DW_FORM_sec_offset
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{0,0}, // 0x18 DW_FORM_exprloc
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{1,0}, // 0x19 DW_FORM_flag_present
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{0,0}, // 0x1a
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{0,0}, // 0x1b
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{0,0}, // 0x1c
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{0,0}, // 0x1d
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{0,0}, // 0x1e
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{0,0}, // 0x1f
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{1,8}, // 0x20 DW_FORM_ref_sig8
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};
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llvm::Optional<uint8_t>
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DWARFFormValue::GetFixedSize(dw_form_t form, const DWARFUnit *u) {
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if (form <= DW_FORM_ref_sig8 && g_form_sizes[form].valid)
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return g_form_sizes[form].size;
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if (form == DW_FORM_addr && u)
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return u->GetAddressByteSize();
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return llvm::None;
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}
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llvm::Optional<uint8_t> DWARFFormValue::GetFixedSize() const {
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return GetFixedSize(m_form, m_unit);
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}
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bool DWARFFormValue::SkipValue(const DWARFDataExtractor &debug_info_data,
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lldb::offset_t *offset_ptr) const {
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return DWARFFormValue::SkipValue(m_form, debug_info_data, offset_ptr, m_unit);
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}
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bool DWARFFormValue::SkipValue(dw_form_t form,
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const DWARFDataExtractor &debug_info_data,
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lldb::offset_t *offset_ptr,
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const DWARFUnit *unit) {
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uint8_t ref_addr_size;
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switch (form) {
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// Blocks if inlined data that have a length field and the data bytes inlined
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// in the .debug_info
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case DW_FORM_exprloc:
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case DW_FORM_block: {
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dw_uleb128_t size = debug_info_data.GetULEB128(offset_ptr);
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*offset_ptr += size;
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}
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return true;
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case DW_FORM_block1: {
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dw_uleb128_t size = debug_info_data.GetU8(offset_ptr);
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*offset_ptr += size;
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}
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return true;
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case DW_FORM_block2: {
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dw_uleb128_t size = debug_info_data.GetU16(offset_ptr);
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*offset_ptr += size;
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}
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return true;
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case DW_FORM_block4: {
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dw_uleb128_t size = debug_info_data.GetU32(offset_ptr);
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*offset_ptr += size;
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}
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return true;
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// Inlined NULL terminated C-strings
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case DW_FORM_string:
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debug_info_data.GetCStr(offset_ptr);
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return true;
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// Compile unit address sized values
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case DW_FORM_addr:
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*offset_ptr += DWARFUnit::GetAddressByteSize(unit);
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return true;
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case DW_FORM_ref_addr:
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ref_addr_size = 4;
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assert(unit); // Unit must be valid for DW_FORM_ref_addr objects or we will
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// get this wrong
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if (unit->GetVersion() <= 2)
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ref_addr_size = unit->GetAddressByteSize();
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else
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ref_addr_size = 4;
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*offset_ptr += ref_addr_size;
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return true;
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// 0 bytes values (implied from DW_FORM)
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case DW_FORM_flag_present:
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case DW_FORM_implicit_const:
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return true;
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// 1 byte values
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case DW_FORM_addrx1:
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case DW_FORM_data1:
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case DW_FORM_flag:
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case DW_FORM_ref1:
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case DW_FORM_strx1:
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*offset_ptr += 1;
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return true;
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// 2 byte values
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case DW_FORM_addrx2:
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case DW_FORM_data2:
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case DW_FORM_ref2:
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case DW_FORM_strx2:
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*offset_ptr += 2;
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return true;
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// 3 byte values
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case DW_FORM_addrx3:
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case DW_FORM_strx3:
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*offset_ptr += 3;
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return true;
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// 32 bit for DWARF 32, 64 for DWARF 64
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case DW_FORM_sec_offset:
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case DW_FORM_strp:
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*offset_ptr += 4;
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return true;
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// 4 byte values
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case DW_FORM_addrx4:
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case DW_FORM_data4:
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case DW_FORM_ref4:
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case DW_FORM_strx4:
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*offset_ptr += 4;
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return true;
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// 8 byte values
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case DW_FORM_data8:
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case DW_FORM_ref8:
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case DW_FORM_ref_sig8:
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*offset_ptr += 8;
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return true;
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// signed or unsigned LEB 128 values
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case DW_FORM_addrx:
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case DW_FORM_loclistx:
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case DW_FORM_rnglistx:
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case DW_FORM_sdata:
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case DW_FORM_udata:
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case DW_FORM_ref_udata:
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case DW_FORM_GNU_addr_index:
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case DW_FORM_GNU_str_index:
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case DW_FORM_strx:
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debug_info_data.Skip_LEB128(offset_ptr);
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return true;
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case DW_FORM_indirect: {
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dw_form_t indirect_form = debug_info_data.GetULEB128(offset_ptr);
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return DWARFFormValue::SkipValue(indirect_form, debug_info_data, offset_ptr,
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unit);
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}
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default:
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break;
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}
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return false;
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}
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void DWARFFormValue::Dump(Stream &s) const {
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uint64_t uvalue = Unsigned();
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bool unit_relative_offset = false;
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switch (m_form) {
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case DW_FORM_addr:
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DumpAddress(s.AsRawOstream(), uvalue, sizeof(uint64_t));
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break;
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case DW_FORM_flag:
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case DW_FORM_data1:
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s.PutHex8(uvalue);
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break;
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case DW_FORM_data2:
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s.PutHex16(uvalue);
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break;
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case DW_FORM_sec_offset:
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case DW_FORM_data4:
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s.PutHex32(uvalue);
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break;
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case DW_FORM_ref_sig8:
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case DW_FORM_data8:
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s.PutHex64(uvalue);
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break;
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case DW_FORM_string:
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s.QuotedCString(AsCString());
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break;
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case DW_FORM_exprloc:
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case DW_FORM_block:
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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if (uvalue > 0) {
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switch (m_form) {
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case DW_FORM_exprloc:
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case DW_FORM_block:
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s.Printf("<0x%" PRIx64 "> ", uvalue);
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break;
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case DW_FORM_block1:
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s.Printf("<0x%2.2x> ", (uint8_t)uvalue);
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break;
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case DW_FORM_block2:
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s.Printf("<0x%4.4x> ", (uint16_t)uvalue);
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break;
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case DW_FORM_block4:
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s.Printf("<0x%8.8x> ", (uint32_t)uvalue);
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break;
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default:
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break;
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}
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const uint8_t *data_ptr = m_value.data;
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if (data_ptr) {
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const uint8_t *end_data_ptr =
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data_ptr + uvalue; // uvalue contains size of block
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while (data_ptr < end_data_ptr) {
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s.Printf("%2.2x ", *data_ptr);
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++data_ptr;
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}
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} else
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s.PutCString("NULL");
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}
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break;
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case DW_FORM_sdata:
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s.PutSLEB128(uvalue);
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break;
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case DW_FORM_udata:
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s.PutULEB128(uvalue);
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break;
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case DW_FORM_strp: {
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const char *dbg_str = AsCString();
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if (dbg_str) {
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s.QuotedCString(dbg_str);
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} else {
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s.PutHex32(uvalue);
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}
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} break;
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case DW_FORM_ref_addr: {
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assert(m_unit); // Unit must be valid for DW_FORM_ref_addr objects or we
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// will get this wrong
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if (m_unit->GetVersion() <= 2)
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DumpAddress(s.AsRawOstream(), uvalue, sizeof(uint64_t) * 2);
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else
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DumpAddress(s.AsRawOstream(), uvalue,
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4 * 2); // 4 for DWARF32, 8 for DWARF64, but we don't
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// support DWARF64 yet
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break;
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}
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case DW_FORM_ref1:
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unit_relative_offset = true;
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break;
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case DW_FORM_ref2:
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unit_relative_offset = true;
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break;
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case DW_FORM_ref4:
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unit_relative_offset = true;
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break;
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case DW_FORM_ref8:
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unit_relative_offset = true;
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break;
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case DW_FORM_ref_udata:
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unit_relative_offset = true;
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break;
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// All DW_FORM_indirect attributes should be resolved prior to calling this
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// function
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case DW_FORM_indirect:
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s.PutCString("DW_FORM_indirect");
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break;
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case DW_FORM_flag_present:
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break;
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default:
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s.Printf("DW_FORM(0x%4.4x)", m_form);
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break;
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}
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if (unit_relative_offset) {
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assert(m_unit); // Unit must be valid for DW_FORM_ref forms that are compile
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// unit relative or we will get this wrong
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s.Printf("{0x%8.8" PRIx64 "}", uvalue + m_unit->GetOffset());
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}
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}
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const char *DWARFFormValue::AsCString() const {
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DWARFContext &context = m_unit->GetSymbolFileDWARF().GetDWARFContext();
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if (m_form == DW_FORM_string)
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return m_value.value.cstr;
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if (m_form == DW_FORM_strp)
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return context.getOrLoadStrData().PeekCStr(m_value.value.uval);
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if (m_form == DW_FORM_GNU_str_index || m_form == DW_FORM_strx ||
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m_form == DW_FORM_strx1 || m_form == DW_FORM_strx2 ||
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m_form == DW_FORM_strx3 || m_form == DW_FORM_strx4) {
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llvm::Optional<uint64_t> offset =
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m_unit->GetStringOffsetSectionItem(m_value.value.uval);
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if (!offset)
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return nullptr;
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return context.getOrLoadStrData().PeekCStr(*offset);
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}
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if (m_form == DW_FORM_line_strp)
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return context.getOrLoadLineStrData().PeekCStr(m_value.value.uval);
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return nullptr;
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}
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dw_addr_t DWARFFormValue::Address() const {
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SymbolFileDWARF &symbol_file = m_unit->GetSymbolFileDWARF();
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if (m_form == DW_FORM_addr)
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return Unsigned();
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assert(m_unit);
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assert(m_form == DW_FORM_GNU_addr_index || m_form == DW_FORM_addrx ||
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m_form == DW_FORM_addrx1 || m_form == DW_FORM_addrx2 ||
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m_form == DW_FORM_addrx3 || m_form == DW_FORM_addrx4);
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uint32_t index_size = m_unit->GetAddressByteSize();
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dw_offset_t addr_base = m_unit->GetAddrBase();
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lldb::offset_t offset = addr_base + m_value.value.uval * index_size;
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return symbol_file.GetDWARFContext().getOrLoadAddrData().GetMaxU64(
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&offset, index_size);
|
|
}
|
|
|
|
DWARFDIE DWARFFormValue::Reference() const {
|
|
uint64_t value = 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:
|
|
assert(m_unit); // Unit must be valid for DW_FORM_ref forms that are compile
|
|
// unit relative or we will get this wrong
|
|
value += m_unit->GetOffset();
|
|
if (!m_unit->ContainsDIEOffset(value)) {
|
|
m_unit->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
|
|
"DW_FORM_ref* DIE reference 0x%" PRIx64 " is outside of its CU",
|
|
value);
|
|
return {};
|
|
}
|
|
return const_cast<DWARFUnit *>(m_unit)->GetDIE(value);
|
|
|
|
case DW_FORM_ref_addr: {
|
|
DWARFUnit *ref_cu =
|
|
m_unit->GetSymbolFileDWARF().DebugInfo().GetUnitContainingDIEOffset(
|
|
DIERef::Section::DebugInfo, value);
|
|
if (!ref_cu) {
|
|
m_unit->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
|
|
"DW_FORM_ref_addr DIE reference 0x%" PRIx64 " has no matching CU",
|
|
value);
|
|
return {};
|
|
}
|
|
return ref_cu->GetDIE(value);
|
|
}
|
|
|
|
case DW_FORM_ref_sig8: {
|
|
DWARFTypeUnit *tu =
|
|
m_unit->GetSymbolFileDWARF().DebugInfo().GetTypeUnitForHash(value);
|
|
if (!tu)
|
|
return {};
|
|
return tu->GetDIE(tu->GetTypeOffset());
|
|
}
|
|
|
|
default:
|
|
return {};
|
|
}
|
|
}
|
|
|
|
uint64_t DWARFFormValue::Reference(dw_offset_t base_offset) const {
|
|
uint64_t value = 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:
|
|
return value + base_offset;
|
|
|
|
case DW_FORM_ref_addr:
|
|
case DW_FORM_ref_sig8:
|
|
case DW_FORM_GNU_ref_alt:
|
|
return value;
|
|
|
|
default:
|
|
return DW_INVALID_OFFSET;
|
|
}
|
|
}
|
|
|
|
const uint8_t *DWARFFormValue::BlockData() const { return m_value.data; }
|
|
|
|
bool DWARFFormValue::IsBlockForm(const dw_form_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(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;
|
|
}
|
|
|
|
bool DWARFFormValue::FormIsSupported(dw_form_t form) {
|
|
switch (form) {
|
|
case DW_FORM_addr:
|
|
case DW_FORM_addrx:
|
|
case DW_FORM_loclistx:
|
|
case DW_FORM_rnglistx:
|
|
case DW_FORM_block2:
|
|
case DW_FORM_block4:
|
|
case DW_FORM_data2:
|
|
case DW_FORM_data4:
|
|
case DW_FORM_data8:
|
|
case DW_FORM_string:
|
|
case DW_FORM_block:
|
|
case DW_FORM_block1:
|
|
case DW_FORM_data1:
|
|
case DW_FORM_flag:
|
|
case DW_FORM_sdata:
|
|
case DW_FORM_strp:
|
|
case DW_FORM_strx:
|
|
case DW_FORM_strx1:
|
|
case DW_FORM_strx2:
|
|
case DW_FORM_strx3:
|
|
case DW_FORM_strx4:
|
|
case DW_FORM_udata:
|
|
case DW_FORM_ref_addr:
|
|
case DW_FORM_ref1:
|
|
case DW_FORM_ref2:
|
|
case DW_FORM_ref4:
|
|
case DW_FORM_ref8:
|
|
case DW_FORM_ref_udata:
|
|
case DW_FORM_indirect:
|
|
case DW_FORM_sec_offset:
|
|
case DW_FORM_exprloc:
|
|
case DW_FORM_flag_present:
|
|
case DW_FORM_ref_sig8:
|
|
case DW_FORM_GNU_str_index:
|
|
case DW_FORM_GNU_addr_index:
|
|
case DW_FORM_implicit_const:
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
return false;
|
|
}
|