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0b6cb7104b
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206252 91177308-0d34-0410-b5e6-96231b3b80d8
550 lines
16 KiB
C++
550 lines
16 KiB
C++
//===-- DWARFFormValue.cpp ------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/DWARFFormValue.h"
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#include "DWARFCompileUnit.h"
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#include "DWARFContext.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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using namespace llvm;
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using namespace dwarf;
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namespace {
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uint8_t getRefAddrSize(uint8_t AddrSize, uint16_t Version) {
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// FIXME: Support DWARF64.
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return (Version == 2) ? AddrSize : 4;
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}
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template <uint8_t AddrSize, uint8_t RefAddrSize>
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ArrayRef<uint8_t> makeFixedFormSizesArrayRef() {
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static const uint8_t sizes[] = {
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0, // 0x00 unused
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AddrSize, // 0x01 DW_FORM_addr
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0, // 0x02 unused
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0, // 0x03 DW_FORM_block2
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0, // 0x04 DW_FORM_block4
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2, // 0x05 DW_FORM_data2
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4, // 0x06 DW_FORM_data4
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8, // 0x07 DW_FORM_data8
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0, // 0x08 DW_FORM_string
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0, // 0x09 DW_FORM_block
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0, // 0x0a DW_FORM_block1
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1, // 0x0b DW_FORM_data1
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1, // 0x0c DW_FORM_flag
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0, // 0x0d DW_FORM_sdata
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4, // 0x0e DW_FORM_strp
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0, // 0x0f DW_FORM_udata
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RefAddrSize, // 0x10 DW_FORM_ref_addr
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1, // 0x11 DW_FORM_ref1
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2, // 0x12 DW_FORM_ref2
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4, // 0x13 DW_FORM_ref4
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8, // 0x14 DW_FORM_ref8
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0, // 0x15 DW_FORM_ref_udata
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0, // 0x16 DW_FORM_indirect
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4, // 0x17 DW_FORM_sec_offset
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0, // 0x18 DW_FORM_exprloc
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0, // 0x19 DW_FORM_flag_present
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};
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return makeArrayRef(sizes);
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}
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}
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ArrayRef<uint8_t> DWARFFormValue::getFixedFormSizes(uint8_t AddrSize,
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uint16_t Version) {
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uint8_t RefAddrSize = getRefAddrSize(AddrSize, Version);
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if (AddrSize == 4 && RefAddrSize == 4)
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return makeFixedFormSizesArrayRef<4, 4>();
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if (AddrSize == 4 && RefAddrSize == 8)
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return makeFixedFormSizesArrayRef<4, 8>();
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if (AddrSize == 8 && RefAddrSize == 4)
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return makeFixedFormSizesArrayRef<8, 4>();
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if (AddrSize == 8 && RefAddrSize == 8)
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return makeFixedFormSizesArrayRef<8, 8>();
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return None;
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}
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static const DWARFFormValue::FormClass DWARF4FormClasses[] = {
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DWARFFormValue::FC_Unknown, // 0x0
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DWARFFormValue::FC_Address, // 0x01 DW_FORM_addr
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DWARFFormValue::FC_Unknown, // 0x02 unused
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DWARFFormValue::FC_Block, // 0x03 DW_FORM_block2
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DWARFFormValue::FC_Block, // 0x04 DW_FORM_block4
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DWARFFormValue::FC_Constant, // 0x05 DW_FORM_data2
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// --- These can be FC_SectionOffset in DWARF3 and below:
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DWARFFormValue::FC_Constant, // 0x06 DW_FORM_data4
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DWARFFormValue::FC_Constant, // 0x07 DW_FORM_data8
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// ---
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DWARFFormValue::FC_String, // 0x08 DW_FORM_string
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DWARFFormValue::FC_Block, // 0x09 DW_FORM_block
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DWARFFormValue::FC_Block, // 0x0a DW_FORM_block1
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DWARFFormValue::FC_Constant, // 0x0b DW_FORM_data1
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DWARFFormValue::FC_Flag, // 0x0c DW_FORM_flag
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DWARFFormValue::FC_Constant, // 0x0d DW_FORM_sdata
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DWARFFormValue::FC_String, // 0x0e DW_FORM_strp
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DWARFFormValue::FC_Constant, // 0x0f DW_FORM_udata
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DWARFFormValue::FC_Reference, // 0x10 DW_FORM_ref_addr
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DWARFFormValue::FC_Reference, // 0x11 DW_FORM_ref1
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DWARFFormValue::FC_Reference, // 0x12 DW_FORM_ref2
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DWARFFormValue::FC_Reference, // 0x13 DW_FORM_ref4
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DWARFFormValue::FC_Reference, // 0x14 DW_FORM_ref8
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DWARFFormValue::FC_Reference, // 0x15 DW_FORM_ref_udata
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DWARFFormValue::FC_Indirect, // 0x16 DW_FORM_indirect
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DWARFFormValue::FC_SectionOffset, // 0x17 DW_FORM_sec_offset
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DWARFFormValue::FC_Exprloc, // 0x18 DW_FORM_exprloc
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DWARFFormValue::FC_Flag, // 0x19 DW_FORM_flag_present
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};
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bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const {
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// First, check DWARF4 form classes.
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if (Form < ArrayRef<FormClass>(DWARF4FormClasses).size() &&
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DWARF4FormClasses[Form] == FC)
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return true;
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// Check DW_FORM_ref_sig8 from DWARF4.
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if (Form == DW_FORM_ref_sig8)
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return (FC == FC_Reference);
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// Check for some DWARF5 forms.
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if (Form == DW_FORM_GNU_addr_index)
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return (FC == FC_Address);
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if (Form == DW_FORM_GNU_str_index)
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return (FC == FC_String);
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// In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset.
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// Don't check for DWARF version here, as some producers may still do this
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// by mistake.
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if ((Form == DW_FORM_data4 || Form == DW_FORM_data8) &&
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FC == FC_SectionOffset)
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return true;
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return false;
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}
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bool DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
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const DWARFUnit *cu) {
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bool indirect = false;
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bool is_block = false;
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Value.data = nullptr;
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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 (Form) {
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case DW_FORM_addr:
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case DW_FORM_ref_addr: {
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uint16_t AddrSize =
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(Form == DW_FORM_addr)
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? cu->getAddressByteSize()
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: getRefAddrSize(cu->getAddressByteSize(), cu->getVersion());
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RelocAddrMap::const_iterator AI = cu->getRelocMap()->find(*offset_ptr);
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if (AI != cu->getRelocMap()->end()) {
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const std::pair<uint8_t, int64_t> &R = AI->second;
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Value.uval = data.getUnsigned(offset_ptr, AddrSize) + R.second;
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} else
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Value.uval = data.getUnsigned(offset_ptr, AddrSize);
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break;
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}
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case DW_FORM_exprloc:
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case DW_FORM_block:
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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_block1:
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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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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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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_data1:
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case DW_FORM_ref1:
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case DW_FORM_flag:
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Value.uval = data.getU8(offset_ptr);
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break;
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case DW_FORM_data2:
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case DW_FORM_ref2:
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Value.uval = data.getU16(offset_ptr);
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break;
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case DW_FORM_data4:
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case DW_FORM_ref4: {
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RelocAddrMap::const_iterator AI = cu->getRelocMap()->find(*offset_ptr);
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Value.uval = data.getU32(offset_ptr);
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if (AI != cu->getRelocMap()->end())
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Value.uval += AI->second.second;
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break;
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}
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case DW_FORM_data8:
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case DW_FORM_ref8:
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Value.uval = data.getU64(offset_ptr);
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break;
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case DW_FORM_sdata:
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Value.sval = data.getSLEB128(offset_ptr);
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break;
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case DW_FORM_strp: {
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RelocAddrMap::const_iterator AI
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= cu->getRelocMap()->find(*offset_ptr);
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if (AI != cu->getRelocMap()->end()) {
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const std::pair<uint8_t, int64_t> &R = AI->second;
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Value.uval = data.getU32(offset_ptr) + R.second;
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} else
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Value.uval = data.getU32(offset_ptr);
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break;
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}
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case DW_FORM_udata:
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case DW_FORM_ref_udata:
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Value.uval = data.getULEB128(offset_ptr);
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break;
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case DW_FORM_string:
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Value.cstr = data.getCStr(offset_ptr);
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break;
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case DW_FORM_indirect:
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Form = data.getULEB128(offset_ptr);
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indirect = true;
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break;
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case DW_FORM_sec_offset: {
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// FIXME: This is 64-bit for DWARF64.
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RelocAddrMap::const_iterator AI
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= cu->getRelocMap()->find(*offset_ptr);
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if (AI != cu->getRelocMap()->end()) {
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const std::pair<uint8_t, int64_t> &R = AI->second;
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Value.uval = data.getU32(offset_ptr) + R.second;
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} else
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Value.uval = data.getU32(offset_ptr);
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break;
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}
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case DW_FORM_flag_present:
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Value.uval = 1;
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break;
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case DW_FORM_ref_sig8:
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Value.uval = data.getU64(offset_ptr);
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break;
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case DW_FORM_GNU_addr_index:
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case DW_FORM_GNU_str_index:
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Value.uval = data.getULEB128(offset_ptr);
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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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StringRef str = data.getData().substr(*offset_ptr, Value.uval);
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Value.data = nullptr;
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if (!str.empty()) {
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Value.data = reinterpret_cast<const uint8_t *>(str.data());
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*offset_ptr += Value.uval;
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}
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}
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return true;
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}
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bool
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DWARFFormValue::skipValue(DataExtractor debug_info_data, uint32_t* offset_ptr,
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const DWARFUnit *cu) const {
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return DWARFFormValue::skipValue(Form, debug_info_data, offset_ptr, cu);
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}
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bool
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DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data,
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uint32_t *offset_ptr, const DWARFUnit *cu) {
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bool indirect = false;
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do {
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switch (form) {
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// Blocks if inlined data that have a length field and the data bytes
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// inlined in the .debug_info
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case DW_FORM_exprloc:
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case DW_FORM_block: {
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uint64_t size = debug_info_data.getULEB128(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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case DW_FORM_block1: {
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uint8_t size = debug_info_data.getU8(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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case DW_FORM_block2: {
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uint16_t size = debug_info_data.getU16(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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case DW_FORM_block4: {
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uint32_t size = debug_info_data.getU32(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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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 += cu->getAddressByteSize();
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return true;
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case DW_FORM_ref_addr:
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*offset_ptr += getRefAddrSize(cu->getAddressByteSize(), cu->getVersion());
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return true;
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// 0 byte values - implied from the form.
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case DW_FORM_flag_present:
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return true;
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// 1 byte values
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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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*offset_ptr += 1;
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return true;
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// 2 byte values
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case DW_FORM_data2:
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case DW_FORM_ref2:
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*offset_ptr += 2;
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return true;
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// 4 byte values
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case DW_FORM_strp:
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case DW_FORM_data4:
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case DW_FORM_ref4:
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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_APPLE_db_str:
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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_str_index:
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case DW_FORM_GNU_addr_index:
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debug_info_data.getULEB128(offset_ptr);
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return true;
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case DW_FORM_indirect:
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indirect = true;
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form = debug_info_data.getULEB128(offset_ptr);
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break;
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// FIXME: 4 for DWARF32, 8 for DWARF64.
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case DW_FORM_sec_offset:
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*offset_ptr += 4;
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return true;
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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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return true;
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}
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void
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DWARFFormValue::dump(raw_ostream &OS, const DWARFUnit *cu) const {
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DataExtractor debug_str_data(cu->getStringSection(), true, 0);
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DataExtractor debug_str_offset_data(cu->getStringOffsetSection(), true, 0);
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uint64_t uvalue = Value.uval;
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bool cu_relative_offset = false;
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switch (Form) {
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case DW_FORM_addr: OS << format("0x%016" PRIx64, uvalue); break;
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case DW_FORM_GNU_addr_index: {
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OS << format(" indexed (%8.8x) address = ", (uint32_t)uvalue);
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uint64_t Address;
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if (cu->getAddrOffsetSectionItem(uvalue, Address))
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OS << format("0x%016" PRIx64, Address);
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else
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OS << "<no .debug_addr section>";
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break;
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}
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case DW_FORM_flag_present: OS << "true"; break;
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case DW_FORM_flag:
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case DW_FORM_data1: OS << format("0x%02x", (uint8_t)uvalue); break;
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case DW_FORM_data2: OS << format("0x%04x", (uint16_t)uvalue); break;
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case DW_FORM_data4: OS << format("0x%08x", (uint32_t)uvalue); break;
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case DW_FORM_ref_sig8:
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case DW_FORM_data8: OS << format("0x%016" PRIx64, uvalue); break;
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case DW_FORM_string:
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OS << '"';
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OS.write_escaped(Value.cstr);
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OS << '"';
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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 (Form) {
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case DW_FORM_exprloc:
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case DW_FORM_block: OS << format("<0x%" PRIx64 "> ", uvalue); break;
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case DW_FORM_block1: OS << format("<0x%2.2x> ", (uint8_t)uvalue); break;
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case DW_FORM_block2: OS << format("<0x%4.4x> ", (uint16_t)uvalue); break;
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case DW_FORM_block4: OS << format("<0x%8.8x> ", (uint32_t)uvalue); break;
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default: break;
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}
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const uint8_t* data_ptr = Value.data;
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if (data_ptr) {
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// uvalue contains size of block
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const uint8_t* end_data_ptr = data_ptr + uvalue;
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while (data_ptr < end_data_ptr) {
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OS << format("%2.2x ", *data_ptr);
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++data_ptr;
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}
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}
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else
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OS << "NULL";
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}
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break;
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case DW_FORM_sdata: OS << Value.sval; break;
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case DW_FORM_udata: OS << Value.uval; break;
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case DW_FORM_strp: {
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OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)uvalue);
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Optional<const char *> DbgStr = getAsCString(cu);
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if (DbgStr.hasValue()) {
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OS << '"';
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OS.write_escaped(DbgStr.getValue());
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OS << '"';
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}
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break;
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}
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case DW_FORM_GNU_str_index: {
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OS << format(" indexed (%8.8x) string = ", (uint32_t)uvalue);
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Optional<const char *> DbgStr = getAsCString(cu);
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if (DbgStr.hasValue()) {
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OS << '"';
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OS.write_escaped(DbgStr.getValue());
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OS << '"';
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}
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break;
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}
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case DW_FORM_ref_addr:
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OS << format("0x%016" PRIx64, uvalue);
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break;
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case DW_FORM_ref1:
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cu_relative_offset = true;
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OS << format("cu + 0x%2.2x", (uint8_t)uvalue);
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break;
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case DW_FORM_ref2:
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cu_relative_offset = true;
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OS << format("cu + 0x%4.4x", (uint16_t)uvalue);
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break;
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case DW_FORM_ref4:
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cu_relative_offset = true;
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OS << format("cu + 0x%4.4x", (uint32_t)uvalue);
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break;
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case DW_FORM_ref8:
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cu_relative_offset = true;
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OS << format("cu + 0x%8.8" PRIx64, uvalue);
|
|
break;
|
|
case DW_FORM_ref_udata:
|
|
cu_relative_offset = true;
|
|
OS << format("cu + 0x%" PRIx64, uvalue);
|
|
break;
|
|
|
|
// All DW_FORM_indirect attributes should be resolved prior to calling
|
|
// this function
|
|
case DW_FORM_indirect:
|
|
OS << "DW_FORM_indirect";
|
|
break;
|
|
|
|
// Should be formatted to 64-bit for DWARF64.
|
|
case DW_FORM_sec_offset:
|
|
OS << format("0x%08x", (uint32_t)uvalue);
|
|
break;
|
|
|
|
default:
|
|
OS << format("DW_FORM(0x%4.4x)", Form);
|
|
break;
|
|
}
|
|
|
|
if (cu_relative_offset)
|
|
OS << format(" => {0x%8.8" PRIx64 "}", uvalue + (cu ? cu->getOffset() : 0));
|
|
}
|
|
|
|
Optional<const char *> DWARFFormValue::getAsCString(const DWARFUnit *U) const {
|
|
if (!isFormClass(FC_String))
|
|
return None;
|
|
if (Form == DW_FORM_string)
|
|
return Value.cstr;
|
|
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;
|
|
}
|
|
if (const char *Str = U->getStringExtractor().getCStr(&Offset)) {
|
|
return Str;
|
|
}
|
|
return None;
|
|
}
|
|
|
|
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 Value.uval;
|
|
}
|
|
|
|
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:
|
|
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:
|
|
return Value.uval;
|
|
}
|
|
}
|
|
|
|
Optional<uint64_t> DWARFFormValue::getAsSectionOffset() const {
|
|
if (!isFormClass(FC_SectionOffset))
|
|
return None;
|
|
return Value.uval;
|
|
}
|
|
|
|
Optional<uint64_t> DWARFFormValue::getAsUnsignedConstant() const {
|
|
if (!isFormClass(FC_Constant) || Form == DW_FORM_sdata)
|
|
return None;
|
|
return Value.uval;
|
|
}
|