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llvm/lib/DebugInfo/DWARFFormValue.cpp

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//===-- DWARFFormValue.cpp ------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DWARFFormValue.h"
#include "DWARFCompileUnit.h"
#include "DWARFContext.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
using namespace llvm;
using namespace dwarf;
static const uint8_t form_sizes_addr4[] = {
0, // 0x00 unused
4, // 0x01 DW_FORM_addr
0, // 0x02 unused
0, // 0x03 DW_FORM_block2
0, // 0x04 DW_FORM_block4
2, // 0x05 DW_FORM_data2
4, // 0x06 DW_FORM_data4
8, // 0x07 DW_FORM_data8
0, // 0x08 DW_FORM_string
0, // 0x09 DW_FORM_block
0, // 0x0a DW_FORM_block1
1, // 0x0b DW_FORM_data1
1, // 0x0c DW_FORM_flag
0, // 0x0d DW_FORM_sdata
4, // 0x0e DW_FORM_strp
0, // 0x0f DW_FORM_udata
4, // 0x10 DW_FORM_ref_addr
1, // 0x11 DW_FORM_ref1
2, // 0x12 DW_FORM_ref2
4, // 0x13 DW_FORM_ref4
8, // 0x14 DW_FORM_ref8
0, // 0x15 DW_FORM_ref_udata
0, // 0x16 DW_FORM_indirect
};
static const uint8_t form_sizes_addr8[] = {
0, // 0x00 unused
8, // 0x01 DW_FORM_addr
0, // 0x02 unused
0, // 0x03 DW_FORM_block2
0, // 0x04 DW_FORM_block4
2, // 0x05 DW_FORM_data2
4, // 0x06 DW_FORM_data4
8, // 0x07 DW_FORM_data8
0, // 0x08 DW_FORM_string
0, // 0x09 DW_FORM_block
0, // 0x0a DW_FORM_block1
1, // 0x0b DW_FORM_data1
1, // 0x0c DW_FORM_flag
0, // 0x0d DW_FORM_sdata
4, // 0x0e DW_FORM_strp
0, // 0x0f DW_FORM_udata
8, // 0x10 DW_FORM_ref_addr
1, // 0x11 DW_FORM_ref1
2, // 0x12 DW_FORM_ref2
4, // 0x13 DW_FORM_ref4
8, // 0x14 DW_FORM_ref8
0, // 0x15 DW_FORM_ref_udata
0, // 0x16 DW_FORM_indirect
};
const uint8_t *
DWARFFormValue::getFixedFormSizesForAddressSize(uint8_t addr_size) {
switch (addr_size) {
case 4: return form_sizes_addr4;
case 8: return form_sizes_addr8;
}
return NULL;
}
bool
DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
const DWARFCompileUnit *cu) {
bool indirect = false;
bool is_block = false;
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 (Form) {
case DW_FORM_addr:
case DW_FORM_ref_addr:
Value.uval = data.getUnsigned(offset_ptr, cu->getAddressByteSize());
break;
case DW_FORM_block:
Value.uval = data.getULEB128(offset_ptr);
is_block = true;
break;
case DW_FORM_block1:
Value.uval = data.getU8(offset_ptr);
is_block = true;
break;
case DW_FORM_block2:
Value.uval = data.getU16(offset_ptr);
is_block = true;
break;
case DW_FORM_block4:
Value.uval = data.getU32(offset_ptr);
is_block = true;
break;
case DW_FORM_data1:
case DW_FORM_ref1:
case DW_FORM_flag:
Value.uval = data.getU8(offset_ptr);
break;
case DW_FORM_data2:
case DW_FORM_ref2:
Value.uval = data.getU16(offset_ptr);
break;
case DW_FORM_data4:
case DW_FORM_ref4:
Value.uval = data.getU32(offset_ptr);
break;
case DW_FORM_data8:
case DW_FORM_ref8:
Value.uval = data.getU64(offset_ptr);
break;
case DW_FORM_sdata:
Value.sval = data.getSLEB128(offset_ptr);
break;
case DW_FORM_strp:
Value.uval = data.getU32(offset_ptr);
break;
case DW_FORM_udata:
case DW_FORM_ref_udata:
Value.uval = data.getULEB128(offset_ptr);
break;
case DW_FORM_string:
Value.cstr = data.getCStr(offset_ptr);
// Set the string value to also be the data for inlined cstr form
// values only so we can tell the differnence between DW_FORM_string
// and DW_FORM_strp form values
Value.data = (uint8_t*)Value.cstr;
break;
case DW_FORM_indirect:
Form = data.getULEB128(offset_ptr);
indirect = true;
break;
default:
return false;
}
} while (indirect);
if (is_block) {
StringRef str = data.getData().substr(*offset_ptr, Value.uval);
Value.data = NULL;
if (!str.empty()) {
Value.data = reinterpret_cast<const uint8_t *>(str.data());
*offset_ptr += Value.uval;
}
}
return true;
}
bool
DWARFFormValue::skipValue(DataExtractor debug_info_data, uint32_t* offset_ptr,
const DWARFCompileUnit *cu) const {
return DWARFFormValue::skipValue(Form, debug_info_data, offset_ptr, cu);
}
bool
DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data,
uint32_t *offset_ptr, const DWARFCompileUnit *cu) {
bool indirect = false;
do {
indirect = false;
switch (form) {
// Blocks if inlined data that have a length field and the data bytes
// inlined in the .debug_info
case DW_FORM_block: {
uint64_t size = debug_info_data.getULEB128(offset_ptr);
*offset_ptr += size;
return true;
}
case DW_FORM_block1: {
uint8_t size = debug_info_data.getU8(offset_ptr);
*offset_ptr += size;
return true;
}
case DW_FORM_block2: {
uint16_t size = debug_info_data.getU16(offset_ptr);
*offset_ptr += size;
return true;
}
case DW_FORM_block4: {
uint32_t size = debug_info_data.getU32(offset_ptr);
*offset_ptr += size;
return true;
}
// Inlined NULL terminated C-strings
case DW_FORM_string:
debug_info_data.getCStr(offset_ptr);
return true;
// Compile unit address sized values
case DW_FORM_addr:
case DW_FORM_ref_addr:
*offset_ptr += cu->getAddressByteSize();
return true;
// 1 byte values
case DW_FORM_data1:
case DW_FORM_flag:
case DW_FORM_ref1:
*offset_ptr += 1;
return true;
// 2 byte values
case DW_FORM_data2:
case DW_FORM_ref2:
*offset_ptr += 2;
return true;
// 4 byte values
case DW_FORM_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:
*offset_ptr += 8;
return true;
// signed or unsigned LEB 128 values
// case DW_FORM_APPLE_db_str:
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
debug_info_data.getULEB128(offset_ptr);
return true;
case DW_FORM_indirect:
indirect = true;
form = debug_info_data.getULEB128(offset_ptr);
break;
default:
return false;
}
} while (indirect);
return true;
}
void
DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const {
DataExtractor debug_str_data(cu->getContext().getStringSection(), true, 0);
uint64_t uvalue = getUnsigned();
bool cu_relative_offset = false;
switch (Form) {
case DW_FORM_addr: OS << format("0x%016" PRIx64, uvalue); break;
case DW_FORM_flag:
case DW_FORM_data1: OS << format("0x%02x", (uint8_t)uvalue); break;
case DW_FORM_data2: OS << format("0x%04x", (uint16_t)uvalue); break;
case DW_FORM_data4: OS << format("0x%08x", (uint32_t)uvalue); break;
case DW_FORM_data8: OS << format("0x%016" PRIx64, uvalue); break;
case DW_FORM_string:
OS << '"';
OS.write_escaped(getAsCString(NULL));
OS << '"';
break;
case DW_FORM_block:
case DW_FORM_block1:
case DW_FORM_block2:
case DW_FORM_block4:
if (uvalue > 0) {
switch (Form) {
case DW_FORM_block: OS << format("<0x%" PRIx64 "> ", uvalue); break;
case DW_FORM_block1: OS << format("<0x%2.2x> ", (uint8_t)uvalue); break;
case DW_FORM_block2: OS << format("<0x%4.4x> ", (uint16_t)uvalue); break;
case DW_FORM_block4: OS << format("<0x%8.8x> ", (uint32_t)uvalue); break;
default: break;
}
const uint8_t* data_ptr = Value.data;
if (data_ptr) {
// uvalue contains size of block
const uint8_t* end_data_ptr = data_ptr + uvalue;
while (data_ptr < end_data_ptr) {
OS << format("%2.2x ", *data_ptr);
++data_ptr;
}
}
else
OS << "NULL";
}
break;
case DW_FORM_sdata: OS << getSigned(); break;
case DW_FORM_udata: OS << getUnsigned(); break;
case DW_FORM_strp: {
OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)uvalue);
const char* dbg_str = getAsCString(&debug_str_data);
if (dbg_str) {
OS << '"';
OS.write_escaped(dbg_str);
OS << '"';
}
break;
}
case DW_FORM_ref_addr:
OS << format("0x%016" PRIx64, uvalue);
break;
case DW_FORM_ref1:
cu_relative_offset = true;
OS << format("cu + 0x%2.2x", (uint8_t)uvalue);
break;
case DW_FORM_ref2:
cu_relative_offset = true;
OS << format("cu + 0x%4.4x", (uint16_t)uvalue);
break;
case DW_FORM_ref4:
cu_relative_offset = true;
OS << format("cu + 0x%4.4x", (uint32_t)uvalue);
break;
case DW_FORM_ref8:
cu_relative_offset = true;
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;
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)));
}
const char*
DWARFFormValue::getAsCString(const DataExtractor *debug_str_data_ptr) const {
if (isInlinedCStr()) {
return Value.cstr;
} else if (debug_str_data_ptr) {
uint32_t offset = Value.uval;
return debug_str_data_ptr->getCStr(&offset);
}
return NULL;
}
uint64_t DWARFFormValue::getReference(const DWARFCompileUnit *cu) const {
uint64_t die_offset = Value.uval;
switch (Form) {
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_udata:
die_offset += (cu ? cu->getOffset() : 0);
break;
default:
break;
}
return die_offset;
}
bool
DWARFFormValue::resolveCompileUnitReferences(const DWARFCompileUnit *cu) {
switch (Form) {
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_udata:
Value.uval += cu->getOffset();
Form = DW_FORM_ref_addr;
return true;
default:
break;
}
return false;
}
const uint8_t *DWARFFormValue::BlockData() const {
if (!isInlinedCStr())
return Value.data;
return NULL;
}
bool DWARFFormValue::isBlockForm(uint16_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(uint16_t form) {
switch (form) {
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
case DW_FORM_data8:
return true;
}
return false;
}
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