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428 lines
11 KiB
C++
428 lines
11 KiB
C++
//===-- DWARFFormValue.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 "DWARFFormValue.h"
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#include "DWARFCompileUnit.h"
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#include "DWARFContext.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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#include <cassert>
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using namespace llvm;
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using namespace dwarf;
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static const uint8_t form_sizes_addr4[] = {
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0, // 0x00 unused
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4, // 0x01 DW_FORM_addr
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0, // 0x02 unused
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0, // 0x03 DW_FORM_block2
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0, // 0x04 DW_FORM_block4
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2, // 0x05 DW_FORM_data2
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4, // 0x06 DW_FORM_data4
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8, // 0x07 DW_FORM_data8
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0, // 0x08 DW_FORM_string
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0, // 0x09 DW_FORM_block
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0, // 0x0a DW_FORM_block1
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1, // 0x0b DW_FORM_data1
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1, // 0x0c DW_FORM_flag
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0, // 0x0d DW_FORM_sdata
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4, // 0x0e DW_FORM_strp
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0, // 0x0f DW_FORM_udata
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4, // 0x10 DW_FORM_ref_addr
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1, // 0x11 DW_FORM_ref1
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2, // 0x12 DW_FORM_ref2
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4, // 0x13 DW_FORM_ref4
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8, // 0x14 DW_FORM_ref8
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0, // 0x15 DW_FORM_ref_udata
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0, // 0x16 DW_FORM_indirect
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};
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static const uint8_t form_sizes_addr8[] = {
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0, // 0x00 unused
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8, // 0x01 DW_FORM_addr
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0, // 0x02 unused
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0, // 0x03 DW_FORM_block2
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0, // 0x04 DW_FORM_block4
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2, // 0x05 DW_FORM_data2
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4, // 0x06 DW_FORM_data4
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8, // 0x07 DW_FORM_data8
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0, // 0x08 DW_FORM_string
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0, // 0x09 DW_FORM_block
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0, // 0x0a DW_FORM_block1
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1, // 0x0b DW_FORM_data1
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1, // 0x0c DW_FORM_flag
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0, // 0x0d DW_FORM_sdata
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4, // 0x0e DW_FORM_strp
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0, // 0x0f DW_FORM_udata
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8, // 0x10 DW_FORM_ref_addr
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1, // 0x11 DW_FORM_ref1
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2, // 0x12 DW_FORM_ref2
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4, // 0x13 DW_FORM_ref4
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8, // 0x14 DW_FORM_ref8
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0, // 0x15 DW_FORM_ref_udata
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0, // 0x16 DW_FORM_indirect
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};
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const uint8_t *
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DWARFFormValue::getFixedFormSizesForAddressSize(uint8_t addr_size) {
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switch (addr_size) {
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case 4: return form_sizes_addr4;
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case 8: return form_sizes_addr8;
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}
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return NULL;
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}
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bool
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DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
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const DWARFCompileUnit *cu) {
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bool indirect = false;
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bool is_block = false;
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Value.data = NULL;
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// Read the value for the form into value and follow and DW_FORM_indirect
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// instances we run into
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do {
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indirect = false;
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switch (Form) {
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case DW_FORM_addr:
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case DW_FORM_ref_addr:
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Value.uval = data.getUnsigned(offset_ptr, cu->getAddressByteSize());
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break;
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case DW_FORM_block:
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Value.uval = data.getULEB128(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_block1:
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Value.uval = data.getU8(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_block2:
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Value.uval = data.getU16(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_block4:
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Value.uval = data.getU32(offset_ptr);
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is_block = true;
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break;
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case DW_FORM_data1:
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case DW_FORM_ref1:
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case DW_FORM_flag:
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Value.uval = data.getU8(offset_ptr);
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break;
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case DW_FORM_data2:
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case DW_FORM_ref2:
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Value.uval = data.getU16(offset_ptr);
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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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Value.uval = data.getU32(offset_ptr);
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break;
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case DW_FORM_data8:
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case DW_FORM_ref8:
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Value.uval = data.getU64(offset_ptr);
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break;
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case DW_FORM_sdata:
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Value.sval = data.getSLEB128(offset_ptr);
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break;
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case DW_FORM_strp:
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Value.uval = data.getU32(offset_ptr);
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break;
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case DW_FORM_udata:
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case DW_FORM_ref_udata:
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Value.uval = data.getULEB128(offset_ptr);
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break;
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case DW_FORM_string:
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Value.cstr = data.getCStr(offset_ptr);
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// Set the string value to also be the data for inlined cstr form
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// values only so we can tell the differnence between DW_FORM_string
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// and DW_FORM_strp form values
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Value.data = (uint8_t*)Value.cstr;
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break;
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case DW_FORM_indirect:
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Form = data.getULEB128(offset_ptr);
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indirect = true;
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break;
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default:
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return false;
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}
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} while (indirect);
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if (is_block) {
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StringRef str = data.getData().substr(*offset_ptr, Value.uval);
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Value.data = NULL;
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if (!str.empty()) {
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Value.data = reinterpret_cast<const uint8_t *>(str.data());
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*offset_ptr += Value.uval;
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}
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}
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return true;
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}
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bool
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DWARFFormValue::skipValue(DataExtractor debug_info_data, uint32_t* offset_ptr,
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const DWARFCompileUnit *cu) const {
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return DWARFFormValue::skipValue(Form, debug_info_data, offset_ptr, cu);
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}
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bool
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DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data,
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uint32_t *offset_ptr, const DWARFCompileUnit *cu) {
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bool indirect = false;
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do {
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indirect = false;
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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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uint64_t size = debug_info_data.getULEB128(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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case DW_FORM_block1: {
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uint8_t size = debug_info_data.getU8(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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case DW_FORM_block2: {
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uint16_t size = debug_info_data.getU16(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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case DW_FORM_block4: {
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uint32_t size = debug_info_data.getU32(offset_ptr);
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*offset_ptr += size;
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return true;
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}
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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_ptr);
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return true;
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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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*offset_ptr += cu->getAddressByteSize();
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return true;
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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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*offset_ptr += 1;
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return true;
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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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*offset_ptr += 2;
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return true;
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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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*offset_ptr += 4;
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return true;
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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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*offset_ptr += 8;
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return true;
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// signed or unsigned LEB 128 values
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// case DW_FORM_APPLE_db_str:
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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_ptr);
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return true;
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case DW_FORM_indirect:
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indirect = true;
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form = debug_info_data.getULEB128(offset_ptr);
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break;
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default:
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return false;
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}
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} while (indirect);
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return true;
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}
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void
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DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const {
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DataExtractor debug_str_data(cu->getContext().getStringSection(), true, 0);
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uint64_t uvalue = getUnsigned();
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bool cu_relative_offset = false;
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switch (Form) {
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case DW_FORM_addr: OS << format("0x%016" PRIx64, uvalue); break;
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case DW_FORM_flag:
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case DW_FORM_data1: OS << format("0x%02x", (uint8_t)uvalue); break;
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case DW_FORM_data2: OS << format("0x%04x", (uint16_t)uvalue); break;
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case DW_FORM_data4: OS << format("0x%08x", (uint32_t)uvalue); break;
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case DW_FORM_data8: OS << format("0x%016" PRIx64, uvalue); break;
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case DW_FORM_string:
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OS << '"';
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OS.write_escaped(getAsCString(NULL));
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OS << '"';
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break;
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case DW_FORM_block:
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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if (uvalue > 0) {
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switch (Form) {
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case DW_FORM_block: OS << format("<0x%" PRIx64 "> ", uvalue); break;
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case DW_FORM_block1: OS << format("<0x%2.2x> ", (uint8_t)uvalue); break;
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case DW_FORM_block2: OS << format("<0x%4.4x> ", (uint16_t)uvalue); break;
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case DW_FORM_block4: OS << format("<0x%8.8x> ", (uint32_t)uvalue); break;
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default: break;
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}
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const uint8_t* data_ptr = Value.data;
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if (data_ptr) {
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// uvalue contains size of block
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const uint8_t* end_data_ptr = data_ptr + uvalue;
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while (data_ptr < end_data_ptr) {
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OS << format("%2.2x ", *data_ptr);
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++data_ptr;
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}
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}
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else
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OS << "NULL";
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}
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break;
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case DW_FORM_sdata: OS << getSigned(); break;
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case DW_FORM_udata: OS << getUnsigned(); break;
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case DW_FORM_strp: {
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OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)uvalue);
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const char* dbg_str = getAsCString(&debug_str_data);
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if (dbg_str) {
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OS << '"';
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OS.write_escaped(dbg_str);
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OS << '"';
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}
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break;
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}
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case DW_FORM_ref_addr:
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OS << format("0x%016" PRIx64, uvalue);
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break;
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case DW_FORM_ref1:
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cu_relative_offset = true;
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OS << format("cu + 0x%2.2x", (uint8_t)uvalue);
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break;
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case DW_FORM_ref2:
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cu_relative_offset = true;
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OS << format("cu + 0x%4.4x", (uint16_t)uvalue);
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break;
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case DW_FORM_ref4:
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cu_relative_offset = true;
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OS << format("cu + 0x%4.4x", (uint32_t)uvalue);
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break;
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case DW_FORM_ref8:
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cu_relative_offset = true;
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OS << format("cu + 0x%8.8" PRIx64, uvalue);
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break;
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case DW_FORM_ref_udata:
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cu_relative_offset = true;
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OS << format("cu + 0x%" PRIx64, uvalue);
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break;
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// All DW_FORM_indirect attributes should be resolved prior to calling
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// this function
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case DW_FORM_indirect:
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OS << "DW_FORM_indirect";
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break;
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default:
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OS << format("DW_FORM(0x%4.4x)", Form);
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break;
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}
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if (cu_relative_offset)
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OS << format(" => {0x%8.8" PRIx64 "}", uvalue + (cu ? cu->getOffset() : 0));
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}
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const char*
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DWARFFormValue::getAsCString(const DataExtractor *debug_str_data_ptr) const {
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if (isInlinedCStr()) {
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return Value.cstr;
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} else if (debug_str_data_ptr) {
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uint32_t offset = Value.uval;
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return debug_str_data_ptr->getCStr(&offset);
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}
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return NULL;
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}
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uint64_t DWARFFormValue::getReference(const DWARFCompileUnit *cu) const {
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uint64_t die_offset = Value.uval;
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switch (Form) {
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case DW_FORM_ref1:
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case DW_FORM_ref2:
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case DW_FORM_ref4:
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case DW_FORM_ref8:
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case DW_FORM_ref_udata:
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die_offset += (cu ? cu->getOffset() : 0);
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break;
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default:
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break;
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}
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return die_offset;
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}
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bool
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DWARFFormValue::resolveCompileUnitReferences(const DWARFCompileUnit *cu) {
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switch (Form) {
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case DW_FORM_ref1:
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case DW_FORM_ref2:
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case DW_FORM_ref4:
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case DW_FORM_ref8:
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case DW_FORM_ref_udata:
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Value.uval += cu->getOffset();
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Form = DW_FORM_ref_addr;
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return true;
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default:
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break;
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}
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return false;
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}
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const uint8_t *DWARFFormValue::BlockData() const {
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if (!isInlinedCStr())
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return Value.data;
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return NULL;
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}
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bool DWARFFormValue::isBlockForm(uint16_t form) {
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switch (form) {
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case DW_FORM_block:
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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return true;
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}
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return false;
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}
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bool DWARFFormValue::isDataForm(uint16_t form) {
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switch (form) {
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case DW_FORM_sdata:
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case DW_FORM_udata:
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case DW_FORM_data1:
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case DW_FORM_data2:
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case DW_FORM_data4:
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case DW_FORM_data8:
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return true;
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}
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return false;
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}
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