443 lines
14 KiB
C++
443 lines
14 KiB
C++
//===-- DWARFDebugInfoEntry.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 "DWARFDebugInfoEntry.h"
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#include "DWARFCompileUnit.h"
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#include "DWARFContext.h"
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#include "DWARFDebugAbbrev.h"
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#include "DWARFFormValue.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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using namespace llvm;
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using namespace dwarf;
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void DWARFDebugInfoEntryMinimal::dump(raw_ostream &OS,
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const DWARFCompileUnit *cu,
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unsigned recurseDepth,
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unsigned indent) const {
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DataExtractor debug_info_data = cu->getDebugInfoExtractor();
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uint32_t offset = Offset;
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if (debug_info_data.isValidOffset(offset)) {
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uint32_t abbrCode = debug_info_data.getULEB128(&offset);
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OS << format("\n0x%8.8x: ", Offset);
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if (abbrCode) {
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if (AbbrevDecl) {
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const char *tagString = TagString(getTag());
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if (tagString)
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OS.indent(indent) << tagString;
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else
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OS.indent(indent) << format("DW_TAG_Unknown_%x", getTag());
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OS << format(" [%u] %c\n", abbrCode,
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AbbrevDecl->hasChildren() ? '*' : ' ');
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// Dump all data in the .debug_info for the attributes
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const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
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for (uint32_t i = 0; i != numAttributes; ++i) {
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uint16_t attr = AbbrevDecl->getAttrByIndex(i);
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uint16_t form = AbbrevDecl->getFormByIndex(i);
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dumpAttribute(OS, cu, &offset, attr, form, indent);
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}
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const DWARFDebugInfoEntryMinimal *child = getFirstChild();
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if (recurseDepth > 0 && child) {
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while (child) {
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child->dump(OS, cu, recurseDepth-1, indent+2);
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child = child->getSibling();
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}
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}
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} else {
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OS << "Abbreviation code not found in 'debug_abbrev' class for code: "
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<< abbrCode << '\n';
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}
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} else {
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OS.indent(indent) << "NULL\n";
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}
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}
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}
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void DWARFDebugInfoEntryMinimal::dumpAttribute(raw_ostream &OS,
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const DWARFCompileUnit *cu,
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uint32_t* offset_ptr,
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uint16_t attr,
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uint16_t form,
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unsigned indent) const {
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OS << format("0x%8.8x: ", *offset_ptr);
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OS.indent(indent+2);
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const char *attrString = AttributeString(attr);
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if (attrString)
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OS << attrString;
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else
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OS << format("DW_AT_Unknown_%x", attr);
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const char *formString = FormEncodingString(form);
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if (formString)
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OS << " [" << formString << ']';
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else
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OS << format(" [DW_FORM_Unknown_%x]", form);
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DWARFFormValue formValue(form);
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if (!formValue.extractValue(cu->getDebugInfoExtractor(), offset_ptr, cu))
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return;
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OS << "\t(";
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formValue.dump(OS, cu);
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OS << ")\n";
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}
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bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFCompileUnit *cu,
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const uint8_t *fixed_form_sizes,
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uint32_t *offset_ptr) {
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Offset = *offset_ptr;
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DataExtractor debug_info_data = cu->getDebugInfoExtractor();
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uint64_t abbrCode = debug_info_data.getULEB128(offset_ptr);
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assert (fixed_form_sizes); // For best performance this should be specified!
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if (abbrCode) {
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uint32_t offset = *offset_ptr;
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AbbrevDecl = cu->getAbbreviations()->getAbbreviationDeclaration(abbrCode);
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// Skip all data in the .debug_info for the attributes
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const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
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uint32_t i;
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uint16_t form;
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for (i=0; i<numAttributes; ++i) {
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form = AbbrevDecl->getFormByIndex(i);
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const uint8_t fixed_skip_size = fixed_form_sizes[form];
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if (fixed_skip_size)
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offset += fixed_skip_size;
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else {
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bool form_is_indirect = false;
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do {
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form_is_indirect = false;
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uint32_t form_size = 0;
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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_block:
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form_size = debug_info_data.getULEB128(&offset);
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break;
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case DW_FORM_block1:
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form_size = debug_info_data.getU8(&offset);
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break;
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case DW_FORM_block2:
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form_size = debug_info_data.getU16(&offset);
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break;
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case DW_FORM_block4:
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form_size = debug_info_data.getU32(&offset);
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break;
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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);
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break;
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// Compile unit address sized values
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case DW_FORM_addr:
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case DW_FORM_ref_addr:
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form_size = cu->getAddressByteSize();
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break;
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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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form_size = 1;
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break;
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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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form_size = 2;
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break;
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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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form_size = 4;
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break;
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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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form_size = 8;
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break;
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// signed or unsigned LEB 128 values
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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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debug_info_data.getULEB128(&offset);
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break;
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case DW_FORM_indirect:
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form_is_indirect = true;
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form = debug_info_data.getULEB128(&offset);
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break;
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default:
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*offset_ptr = Offset;
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return false;
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}
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offset += form_size;
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} while (form_is_indirect);
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}
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}
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*offset_ptr = offset;
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return true;
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} else {
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AbbrevDecl = NULL;
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return true; // NULL debug tag entry
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}
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}
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bool
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DWARFDebugInfoEntryMinimal::extract(const DWARFCompileUnit *cu,
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uint32_t *offset_ptr) {
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DataExtractor debug_info_data = cu->getDebugInfoExtractor();
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const uint32_t cu_end_offset = cu->getNextCompileUnitOffset();
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const uint8_t cu_addr_size = cu->getAddressByteSize();
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uint32_t offset = *offset_ptr;
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if ((offset < cu_end_offset) && debug_info_data.isValidOffset(offset)) {
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Offset = offset;
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uint64_t abbrCode = debug_info_data.getULEB128(&offset);
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if (abbrCode) {
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AbbrevDecl = cu->getAbbreviations()->getAbbreviationDeclaration(abbrCode);
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if (AbbrevDecl) {
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uint16_t tag = AbbrevDecl->getTag();
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bool isCompileUnitTag = tag == DW_TAG_compile_unit;
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if(cu && isCompileUnitTag)
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const_cast<DWARFCompileUnit*>(cu)->setBaseAddress(0);
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// Skip all data in the .debug_info for the attributes
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const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
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for (uint32_t i = 0; i != numAttributes; ++i) {
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uint16_t attr = AbbrevDecl->getAttrByIndex(i);
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uint16_t form = AbbrevDecl->getFormByIndex(i);
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if (isCompileUnitTag &&
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((attr == DW_AT_entry_pc) || (attr == DW_AT_low_pc))) {
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DWARFFormValue form_value(form);
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if (form_value.extractValue(debug_info_data, &offset, cu)) {
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if (attr == DW_AT_low_pc || attr == DW_AT_entry_pc)
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const_cast<DWARFCompileUnit*>(cu)
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->setBaseAddress(form_value.getUnsigned());
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}
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} else {
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bool form_is_indirect = false;
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do {
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form_is_indirect = false;
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register uint32_t form_size = 0;
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switch (form) {
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// Blocks if inlined data that have a length field and the data
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// bytes // inlined in the .debug_info
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case DW_FORM_block:
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form_size = debug_info_data.getULEB128(&offset);
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break;
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case DW_FORM_block1:
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form_size = debug_info_data.getU8(&offset);
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break;
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case DW_FORM_block2:
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form_size = debug_info_data.getU16(&offset);
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break;
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case DW_FORM_block4:
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form_size = debug_info_data.getU32(&offset);
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break;
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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);
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break;
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// Compile unit address sized values
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case DW_FORM_addr:
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case DW_FORM_ref_addr:
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form_size = cu_addr_size;
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break;
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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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form_size = 1;
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break;
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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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form_size = 2;
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break;
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// 4 byte values
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case DW_FORM_strp:
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form_size = 4;
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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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form_size = 4;
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break;
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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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form_size = 8;
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break;
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// signed or unsigned LEB 128 values
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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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debug_info_data.getULEB128(&offset);
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break;
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case DW_FORM_indirect:
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form = debug_info_data.getULEB128(&offset);
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form_is_indirect = true;
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break;
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default:
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*offset_ptr = offset;
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return false;
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}
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offset += form_size;
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} while (form_is_indirect);
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}
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}
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*offset_ptr = offset;
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return true;
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}
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} else {
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AbbrevDecl = NULL;
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*offset_ptr = offset;
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return true; // NULL debug tag entry
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}
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}
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return false;
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}
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uint32_t
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DWARFDebugInfoEntryMinimal::getAttributeValue(const DWARFCompileUnit *cu,
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const uint16_t attr,
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DWARFFormValue &form_value,
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uint32_t *end_attr_offset_ptr)
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const {
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if (AbbrevDecl) {
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uint32_t attr_idx = AbbrevDecl->findAttributeIndex(attr);
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if (attr_idx != -1U) {
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uint32_t offset = getOffset();
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DataExtractor debug_info_data = cu->getDebugInfoExtractor();
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// Skip the abbreviation code so we are at the data for the attributes
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debug_info_data.getULEB128(&offset);
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uint32_t idx = 0;
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while (idx < attr_idx)
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DWARFFormValue::skipValue(AbbrevDecl->getFormByIndex(idx++),
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debug_info_data, &offset, cu);
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const uint32_t attr_offset = offset;
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form_value = DWARFFormValue(AbbrevDecl->getFormByIndex(idx));
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if (form_value.extractValue(debug_info_data, &offset, cu)) {
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if (end_attr_offset_ptr)
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*end_attr_offset_ptr = offset;
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return attr_offset;
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}
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}
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}
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return 0;
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}
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const char*
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DWARFDebugInfoEntryMinimal::getAttributeValueAsString(
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const DWARFCompileUnit* cu,
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const uint16_t attr,
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const char* fail_value) const {
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DWARFFormValue form_value;
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if (getAttributeValue(cu, attr, form_value)) {
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DataExtractor stringExtractor(cu->getContext().getStringSection(),
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false, 0);
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return form_value.getAsCString(&stringExtractor);
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}
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return fail_value;
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}
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uint64_t
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DWARFDebugInfoEntryMinimal::getAttributeValueAsUnsigned(
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const DWARFCompileUnit* cu,
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const uint16_t attr,
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uint64_t fail_value) const {
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DWARFFormValue form_value;
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if (getAttributeValue(cu, attr, form_value))
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return form_value.getUnsigned();
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return fail_value;
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}
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int64_t
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DWARFDebugInfoEntryMinimal::getAttributeValueAsSigned(
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const DWARFCompileUnit* cu,
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const uint16_t attr,
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int64_t fail_value) const {
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DWARFFormValue form_value;
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if (getAttributeValue(cu, attr, form_value))
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return form_value.getSigned();
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return fail_value;
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}
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uint64_t
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DWARFDebugInfoEntryMinimal::getAttributeValueAsReference(
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const DWARFCompileUnit* cu,
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const uint16_t attr,
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uint64_t fail_value) const {
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DWARFFormValue form_value;
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if (getAttributeValue(cu, attr, form_value))
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return form_value.getReference(cu);
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return fail_value;
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}
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void
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DWARFDebugInfoEntryMinimal::buildAddressRangeTable(const DWARFCompileUnit *cu,
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DWARFDebugAranges *debug_aranges)
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const {
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if (AbbrevDecl) {
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uint16_t tag = AbbrevDecl->getTag();
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if (tag == DW_TAG_subprogram) {
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uint64_t hi_pc = -1ULL;
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uint64_t lo_pc = getAttributeValueAsUnsigned(cu, DW_AT_low_pc, -1ULL);
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if (lo_pc != -1ULL)
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hi_pc = getAttributeValueAsUnsigned(cu, DW_AT_high_pc, -1ULL);
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if (hi_pc != -1ULL)
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debug_aranges->appendRange(cu->getOffset(), lo_pc, hi_pc);
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}
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const DWARFDebugInfoEntryMinimal *child = getFirstChild();
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while (child) {
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child->buildAddressRangeTable(cu, debug_aranges);
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child = child->getSibling();
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}
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}
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}
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