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llvm/lib/DebugInfo/DWARFDebugInfoEntry.cpp
Alexey Samsonov 5eae90d727 Add support for fetching inlining context (stack of source code locations) 
by instruction address from DWARF.

Add --inlining flag to llvm-dwarfdump to demonstrate and test this functionality,
so that "llvm-dwarfdump --inlining --address=0x..." now works much like
"addr2line -i 0x...", provided that the binary has debug info
(Clang's -gline-tables-only *is* enough).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163128 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-04 08:12:33 +00:00

578 lines
18 KiB
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//===-- DWARFDebugInfoEntry.cpp -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DWARFDebugInfoEntry.h"
#include "DWARFCompileUnit.h"
#include "DWARFContext.h"
#include "DWARFDebugAbbrev.h"
#include "DWARFFormValue.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace dwarf;
void DWARFDebugInfoEntryMinimal::dump(raw_ostream &OS,
const DWARFCompileUnit *cu,
unsigned recurseDepth,
unsigned indent) const {
DataExtractor debug_info_data = cu->getDebugInfoExtractor();
uint32_t offset = Offset;
if (debug_info_data.isValidOffset(offset)) {
uint32_t abbrCode = debug_info_data.getULEB128(&offset);
OS << format("\n0x%8.8x: ", Offset);
if (abbrCode) {
if (AbbrevDecl) {
const char *tagString = TagString(getTag());
if (tagString)
OS.indent(indent) << tagString;
else
OS.indent(indent) << format("DW_TAG_Unknown_%x", getTag());
OS << format(" [%u] %c\n", abbrCode,
AbbrevDecl->hasChildren() ? '*' : ' ');
// Dump all data in the .debug_info for the attributes
const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
for (uint32_t i = 0; i != numAttributes; ++i) {
uint16_t attr = AbbrevDecl->getAttrByIndex(i);
uint16_t form = AbbrevDecl->getFormByIndex(i);
dumpAttribute(OS, cu, &offset, attr, form, indent);
}
const DWARFDebugInfoEntryMinimal *child = getFirstChild();
if (recurseDepth > 0 && child) {
while (child) {
child->dump(OS, cu, recurseDepth-1, indent+2);
child = child->getSibling();
}
}
} else {
OS << "Abbreviation code not found in 'debug_abbrev' class for code: "
<< abbrCode << '\n';
}
} else {
OS.indent(indent) << "NULL\n";
}
}
}
void DWARFDebugInfoEntryMinimal::dumpAttribute(raw_ostream &OS,
const DWARFCompileUnit *cu,
uint32_t* offset_ptr,
uint16_t attr,
uint16_t form,
unsigned indent) const {
OS << format("0x%8.8x: ", *offset_ptr);
OS.indent(indent+2);
const char *attrString = AttributeString(attr);
if (attrString)
OS << attrString;
else
OS << format("DW_AT_Unknown_%x", attr);
const char *formString = FormEncodingString(form);
if (formString)
OS << " [" << formString << ']';
else
OS << format(" [DW_FORM_Unknown_%x]", form);
DWARFFormValue formValue(form);
if (!formValue.extractValue(cu->getDebugInfoExtractor(), offset_ptr, cu))
return;
OS << "\t(";
formValue.dump(OS, cu);
OS << ")\n";
}
bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFCompileUnit *cu,
const uint8_t *fixed_form_sizes,
uint32_t *offset_ptr) {
Offset = *offset_ptr;
DataExtractor debug_info_data = cu->getDebugInfoExtractor();
uint64_t abbrCode = debug_info_data.getULEB128(offset_ptr);
assert(fixed_form_sizes); // For best performance this should be specified!
if (abbrCode) {
uint32_t offset = *offset_ptr;
AbbrevDecl = cu->getAbbreviations()->getAbbreviationDeclaration(abbrCode);
// Skip all data in the .debug_info for the attributes
const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
uint32_t i;
uint16_t form;
for (i=0; i<numAttributes; ++i) {
form = AbbrevDecl->getFormByIndex(i);
const uint8_t fixed_skip_size = fixed_form_sizes[form];
if (fixed_skip_size)
offset += fixed_skip_size;
else {
bool form_is_indirect = false;
do {
form_is_indirect = false;
uint32_t form_size = 0;
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:
form_size = debug_info_data.getULEB128(&offset);
break;
case DW_FORM_block1:
form_size = debug_info_data.getU8(&offset);
break;
case DW_FORM_block2:
form_size = debug_info_data.getU16(&offset);
break;
case DW_FORM_block4:
form_size = debug_info_data.getU32(&offset);
break;
// Inlined NULL terminated C-strings
case DW_FORM_string:
debug_info_data.getCStr(&offset);
break;
// Compile unit address sized values
case DW_FORM_addr:
case DW_FORM_ref_addr:
form_size = cu->getAddressByteSize();
break;
// 0 sized form.
case DW_FORM_flag_present:
form_size = 0;
break;
// 1 byte values
case DW_FORM_data1:
case DW_FORM_flag:
case DW_FORM_ref1:
form_size = 1;
break;
// 2 byte values
case DW_FORM_data2:
case DW_FORM_ref2:
form_size = 2;
break;
// 4 byte values
case DW_FORM_strp:
case DW_FORM_data4:
case DW_FORM_ref4:
form_size = 4;
break;
// 8 byte values
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sig8:
form_size = 8;
break;
// signed or unsigned LEB 128 values
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
debug_info_data.getULEB128(&offset);
break;
case DW_FORM_indirect:
form_is_indirect = true;
form = debug_info_data.getULEB128(&offset);
break;
case DW_FORM_sec_offset:
if (cu->getAddressByteSize() == 4)
debug_info_data.getU32(offset_ptr);
else
debug_info_data.getU64(offset_ptr);
break;
default:
*offset_ptr = Offset;
return false;
}
offset += form_size;
} while (form_is_indirect);
}
}
*offset_ptr = offset;
return true;
} else {
AbbrevDecl = NULL;
return true; // NULL debug tag entry
}
}
bool
DWARFDebugInfoEntryMinimal::extract(const DWARFCompileUnit *cu,
uint32_t *offset_ptr) {
DataExtractor debug_info_data = cu->getDebugInfoExtractor();
const uint32_t cu_end_offset = cu->getNextCompileUnitOffset();
const uint8_t cu_addr_size = cu->getAddressByteSize();
uint32_t offset = *offset_ptr;
if ((offset < cu_end_offset) && debug_info_data.isValidOffset(offset)) {
Offset = offset;
uint64_t abbrCode = debug_info_data.getULEB128(&offset);
if (abbrCode) {
AbbrevDecl = cu->getAbbreviations()->getAbbreviationDeclaration(abbrCode);
if (AbbrevDecl) {
uint16_t tag = AbbrevDecl->getTag();
bool isCompileUnitTag = tag == DW_TAG_compile_unit;
if(cu && isCompileUnitTag)
const_cast<DWARFCompileUnit*>(cu)->setBaseAddress(0);
// Skip all data in the .debug_info for the attributes
const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
for (uint32_t i = 0; i != numAttributes; ++i) {
uint16_t attr = AbbrevDecl->getAttrByIndex(i);
uint16_t form = AbbrevDecl->getFormByIndex(i);
if (isCompileUnitTag &&
((attr == DW_AT_entry_pc) || (attr == DW_AT_low_pc))) {
DWARFFormValue form_value(form);
if (form_value.extractValue(debug_info_data, &offset, cu)) {
if (attr == DW_AT_low_pc || attr == DW_AT_entry_pc)
const_cast<DWARFCompileUnit*>(cu)
->setBaseAddress(form_value.getUnsigned());
}
} else {
bool form_is_indirect = false;
do {
form_is_indirect = false;
register uint32_t form_size = 0;
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:
form_size = debug_info_data.getULEB128(&offset);
break;
case DW_FORM_block1:
form_size = debug_info_data.getU8(&offset);
break;
case DW_FORM_block2:
form_size = debug_info_data.getU16(&offset);
break;
case DW_FORM_block4:
form_size = debug_info_data.getU32(&offset);
break;
// Inlined NULL terminated C-strings
case DW_FORM_string:
debug_info_data.getCStr(&offset);
break;
// Compile unit address sized values
case DW_FORM_addr:
case DW_FORM_ref_addr:
form_size = cu_addr_size;
break;
// 0 byte value
case DW_FORM_flag_present:
form_size = 0;
break;
// 1 byte values
case DW_FORM_data1:
case DW_FORM_flag:
case DW_FORM_ref1:
form_size = 1;
break;
// 2 byte values
case DW_FORM_data2:
case DW_FORM_ref2:
form_size = 2;
break;
// 4 byte values
case DW_FORM_strp:
form_size = 4;
break;
case DW_FORM_data4:
case DW_FORM_ref4:
form_size = 4;
break;
// 8 byte values
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sig8:
form_size = 8;
break;
// signed or unsigned LEB 128 values
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
debug_info_data.getULEB128(&offset);
break;
case DW_FORM_indirect:
form = debug_info_data.getULEB128(&offset);
form_is_indirect = true;
break;
case DW_FORM_sec_offset:
if (cu->getAddressByteSize() == 4)
debug_info_data.getU32(offset_ptr);
else
debug_info_data.getU64(offset_ptr);
break;
default:
*offset_ptr = offset;
return false;
}
offset += form_size;
} while (form_is_indirect);
}
}
*offset_ptr = offset;
return true;
}
} else {
AbbrevDecl = NULL;
*offset_ptr = offset;
return true; // NULL debug tag entry
}
}
return false;
}
bool DWARFDebugInfoEntryMinimal::isSubprogramDIE() const {
return getTag() == DW_TAG_subprogram;
}
bool DWARFDebugInfoEntryMinimal::isSubroutineDIE() const {
uint32_t Tag = getTag();
return Tag == DW_TAG_subprogram ||
Tag == DW_TAG_inlined_subroutine;
}
uint32_t
DWARFDebugInfoEntryMinimal::getAttributeValue(const DWARFCompileUnit *cu,
const uint16_t attr,
DWARFFormValue &form_value,
uint32_t *end_attr_offset_ptr)
const {
if (AbbrevDecl) {
uint32_t attr_idx = AbbrevDecl->findAttributeIndex(attr);
if (attr_idx != -1U) {
uint32_t offset = getOffset();
DataExtractor debug_info_data = cu->getDebugInfoExtractor();
// Skip the abbreviation code so we are at the data for the attributes
debug_info_data.getULEB128(&offset);
uint32_t idx = 0;
while (idx < attr_idx)
DWARFFormValue::skipValue(AbbrevDecl->getFormByIndex(idx++),
debug_info_data, &offset, cu);
const uint32_t attr_offset = offset;
form_value = DWARFFormValue(AbbrevDecl->getFormByIndex(idx));
if (form_value.extractValue(debug_info_data, &offset, cu)) {
if (end_attr_offset_ptr)
*end_attr_offset_ptr = offset;
return attr_offset;
}
}
}
return 0;
}
const char*
DWARFDebugInfoEntryMinimal::getAttributeValueAsString(
const DWARFCompileUnit* cu,
const uint16_t attr,
const char* fail_value) const {
DWARFFormValue form_value;
if (getAttributeValue(cu, attr, form_value)) {
DataExtractor stringExtractor(cu->getContext().getStringSection(),
false, 0);
return form_value.getAsCString(&stringExtractor);
}
return fail_value;
}
uint64_t
DWARFDebugInfoEntryMinimal::getAttributeValueAsUnsigned(
const DWARFCompileUnit* cu,
const uint16_t attr,
uint64_t fail_value) const {
DWARFFormValue form_value;
if (getAttributeValue(cu, attr, form_value))
return form_value.getUnsigned();
return fail_value;
}
int64_t
DWARFDebugInfoEntryMinimal::getAttributeValueAsSigned(
const DWARFCompileUnit* cu,
const uint16_t attr,
int64_t fail_value) const {
DWARFFormValue form_value;
if (getAttributeValue(cu, attr, form_value))
return form_value.getSigned();
return fail_value;
}
uint64_t
DWARFDebugInfoEntryMinimal::getAttributeValueAsReference(
const DWARFCompileUnit* cu,
const uint16_t attr,
uint64_t fail_value) const {
DWARFFormValue form_value;
if (getAttributeValue(cu, attr, form_value))
return form_value.getReference(cu);
return fail_value;
}
bool DWARFDebugInfoEntryMinimal::getLowAndHighPC(const DWARFCompileUnit *CU,
uint64_t &LowPC, uint64_t &HighPC) const {
HighPC = -1ULL;
LowPC = getAttributeValueAsUnsigned(CU, DW_AT_low_pc, -1ULL);
if (LowPC != -1ULL)
HighPC = getAttributeValueAsUnsigned(CU, DW_AT_high_pc, -1ULL);
return (HighPC != -1ULL);
}
void
DWARFDebugInfoEntryMinimal::buildAddressRangeTable(const DWARFCompileUnit *CU,
DWARFDebugAranges *DebugAranges)
const {
if (AbbrevDecl) {
if (isSubprogramDIE()) {
uint64_t LowPC, HighPC;
if (getLowAndHighPC(CU, LowPC, HighPC)) {
DebugAranges->appendRange(CU->getOffset(), LowPC, HighPC);
}
// FIXME: try to append ranges from .debug_ranges section.
}
const DWARFDebugInfoEntryMinimal *child = getFirstChild();
while (child) {
child->buildAddressRangeTable(CU, DebugAranges);
child = child->getSibling();
}
}
}
bool
DWARFDebugInfoEntryMinimal::addressRangeContainsAddress(
const DWARFCompileUnit *CU, const uint64_t Address) const {
if (isNULL())
return false;
uint64_t LowPC, HighPC;
if (getLowAndHighPC(CU, LowPC, HighPC))
return (LowPC <= Address && Address <= HighPC);
// Try to get address ranges from .debug_ranges section.
uint32_t RangesOffset = getAttributeValueAsReference(CU, DW_AT_ranges, -1U);
if (RangesOffset != -1U) {
DWARFDebugRangeList RangeList;
if (CU->extractRangeList(RangesOffset, RangeList))
return RangeList.containsAddress(CU->getBaseAddress(), Address);
}
return false;
}
const char*
DWARFDebugInfoEntryMinimal::getSubroutineName(
const DWARFCompileUnit *CU) const {
if (!isSubroutineDIE())
return 0;
// Try to get mangled name if possible.
if (const char *name =
getAttributeValueAsString(CU, DW_AT_MIPS_linkage_name, 0))
return name;
if (const char *name = getAttributeValueAsString(CU, DW_AT_linkage_name, 0))
return name;
if (const char *name = getAttributeValueAsString(CU, DW_AT_name, 0))
return name;
// Try to get name from specification DIE.
uint32_t spec_ref =
getAttributeValueAsReference(CU, DW_AT_specification, -1U);
if (spec_ref != -1U) {
DWARFDebugInfoEntryMinimal spec_die;
if (spec_die.extract(CU, &spec_ref)) {
if (const char *name = spec_die.getSubroutineName(CU))
return name;
}
}
// Try to get name from abstract origin DIE.
uint32_t abs_origin_ref =
getAttributeValueAsReference(CU, DW_AT_abstract_origin, -1U);
if (abs_origin_ref != -1U) {
DWARFDebugInfoEntryMinimal abs_origin_die;
if (abs_origin_die.extract(CU, &abs_origin_ref)) {
if (const char *name = abs_origin_die.getSubroutineName(CU))
return name;
}
}
return 0;
}
void DWARFDebugInfoEntryMinimal::getCallerFrame(
const DWARFCompileUnit *CU, uint32_t &CallFile, uint32_t &CallLine,
uint32_t &CallColumn) const {
CallFile = getAttributeValueAsUnsigned(CU, DW_AT_call_file, 0);
CallLine = getAttributeValueAsUnsigned(CU, DW_AT_call_line, 0);
CallColumn = getAttributeValueAsUnsigned(CU, DW_AT_call_column, 0);
}
DWARFDebugInfoEntryMinimal::InlinedChain
DWARFDebugInfoEntryMinimal::getInlinedChainForAddress(
const DWARFCompileUnit *CU, const uint64_t Address) const {
DWARFDebugInfoEntryMinimal::InlinedChain InlinedChain;
if (isNULL())
return InlinedChain;
for (const DWARFDebugInfoEntryMinimal *DIE = this; DIE; ) {
// Append current DIE to inlined chain only if it has correct tag
// (e.g. it is not a lexical block).
if (DIE->isSubroutineDIE()) {
InlinedChain.push_back(*DIE);
}
// Try to get child which also contains provided address.
const DWARFDebugInfoEntryMinimal *Child = DIE->getFirstChild();
while (Child) {
if (Child->addressRangeContainsAddress(CU, Address)) {
// Assume there is only one such child.
break;
}
Child = Child->getSibling();
}
DIE = Child;
}
// Reverse the obtained chain to make the root of inlined chain last.
std::reverse(InlinedChain.begin(), InlinedChain.end());
return InlinedChain;
}
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