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llvm-6502/lib/DebugInfo/DWARFDebugInfoEntry.cpp
Eric Christopher dd8e9f395e Add support for separating strings for the split debug info DWARF5 
proposal. This leaves the strings in the skeleton die as strp,
but in all dwo files they're accessed now via DW_FORM_GNU_str_index.

Add support for dumping these sections and modify the fission-cu.ll
testcase to have the correct strings and form. Fix a small bug
in the fixed form sizes routine that involved out of array accesses
for the table and add a FIXME in the extractFast routine to fix
this up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171779 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-07 19:32:41 +00:00

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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/Debug.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 DIE 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);
// FIXME: Currently we're checking if this is less than the last
// entry in the fixed_form_sizes table, but this should be changed
// to use dynamic dispatch.
const uint8_t fixed_skip_size = (form < DW_FORM_ref_sig8) ?
fixed_form_sizes[form] : 0;
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:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_addr_index:
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:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_addr_index:
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->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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