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https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-21 02:29:22 +00:00
DWARF parser: remove duplicated code and fix code style in DIE extractors.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179023 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
parent
9d55c099d6
commit
d6b89ef0fa
@ -94,280 +94,88 @@ void DWARFDebugInfoEntryMinimal::dumpAttribute(raw_ostream &OS,
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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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bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFCompileUnit *CU,
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const uint8_t *FixedFormSizes,
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uint32_t *OffsetPtr) {
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Offset = *OffsetPtr;
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DataExtractor DebugInfoData = CU->getDebugInfoExtractor();
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uint64_t AbbrCode = DebugInfoData.getULEB128(OffsetPtr);
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if (0 == AbbrCode) {
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// NULL debug tag entry.
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AbbrevDecl = NULL;
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return true;
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}
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AbbrevDecl = CU->getAbbreviations()->getAbbreviationDeclaration(AbbrCode);
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assert(AbbrevDecl);
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assert(FixedFormSizes); // For best performance this should be specified!
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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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for (uint32_t i = 0, n = AbbrevDecl->getNumAttributes(); i < n; ++i) {
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uint16_t Form = AbbrevDecl->getFormByIndex(i);
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// FIXME: Currently we're checking if this is less than the last
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// entry in the fixed_form_sizes table, but this should be changed
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// to use dynamic dispatch.
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const uint8_t fixed_skip_size = (form < DW_FORM_ref_sig8) ?
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fixed_form_sizes[form] : 0;
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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_exprloc:
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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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// 0 sized form.
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case DW_FORM_flag_present:
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form_size = 0;
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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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case DW_FORM_ref_sig8:
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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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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);
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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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// FIXME: 64-bit for DWARF64
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case DW_FORM_sec_offset:
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debug_info_data.getU32(offset_ptr);
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break;
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default:
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*offset_ptr = Offset;
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uint8_t FixedFormSize =
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(Form < DW_FORM_ref_sig8) ? FixedFormSizes[Form] : 0;
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if (FixedFormSize)
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*OffsetPtr += FixedFormSize;
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else if (!DWARFFormValue::skipValue(Form, DebugInfoData, OffsetPtr,
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CU)) {
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// Restore the original offset.
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*OffsetPtr = 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_exprloc:
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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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// 0 byte value
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case DW_FORM_flag_present:
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form_size = 0;
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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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case DW_FORM_ref_sig8:
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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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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);
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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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// FIXME: 64-bit for DWARF64.
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case DW_FORM_sec_offset:
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debug_info_data.getU32(offset_ptr);
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break;
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default:
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*offset_ptr = offset;
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DWARFDebugInfoEntryMinimal::extract(const DWARFCompileUnit *CU,
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uint32_t *OffsetPtr) {
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DataExtractor DebugInfoData = CU->getDebugInfoExtractor();
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const uint32_t CUEndOffset = CU->getNextCompileUnitOffset();
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Offset = *OffsetPtr;
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if ((Offset >= CUEndOffset) || !DebugInfoData.isValidOffset(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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uint64_t AbbrCode = DebugInfoData.getULEB128(OffsetPtr);
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if (0 == AbbrCode) {
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// NULL debug tag entry.
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AbbrevDecl = NULL;
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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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AbbrevDecl = CU->getAbbreviations()->getAbbreviationDeclaration(AbbrCode);
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if (0 == AbbrevDecl) {
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// Restore the original offset.
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*OffsetPtr = Offset;
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return false;
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}
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bool IsCompileUnitTag = (AbbrevDecl->getTag() == DW_TAG_compile_unit);
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if (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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for (uint32_t i = 0, n = AbbrevDecl->getNumAttributes(); i < n; ++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 FormValue(Form);
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if (FormValue.extractValue(DebugInfoData, OffsetPtr, 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(FormValue.getUnsigned());
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}
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} else if (!DWARFFormValue::skipValue(Form, DebugInfoData, OffsetPtr,
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CU)) {
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// Restore the original offset.
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*OffsetPtr = Offset;
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return false;
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}
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}
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return true;
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}
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bool DWARFDebugInfoEntryMinimal::isSubprogramDIE() const {
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return getTag() == DW_TAG_subprogram;
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@ -45,12 +45,17 @@ public:
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uint32_t *offset_ptr, uint16_t attr, uint16_t form,
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unsigned indent = 0) const;
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bool extractFast(const DWARFCompileUnit *cu, const uint8_t *fixed_form_sizes,
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uint32_t *offset_ptr);
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/// Extracts a debug info entry, which is a child of a given compile unit,
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/// starting at a given offset. If DIE can't be extracted, returns false and
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/// doesn't change OffsetPtr.
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bool extractFast(const DWARFCompileUnit *CU, const uint8_t *FixedFormSizes,
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uint32_t *OffsetPtr);
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/// Extract a debug info entry for a given compile unit from the
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/// .debug_info and .debug_abbrev data starting at the given offset.
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bool extract(const DWARFCompileUnit *cu, uint32_t *offset_ptr);
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/// If compile unit can't be parsed, returns false and doesn't change
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/// OffsetPtr.
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bool extract(const DWARFCompileUnit *CU, uint32_t *OffsetPtr);
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uint32_t getTag() const { return AbbrevDecl ? AbbrevDecl->getTag() : 0; }
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bool isNULL() const { return AbbrevDecl == 0; }
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