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//===- lib/MC/MCBTFContext.cpp - Machine Code BTF Context -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCBTFContext.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdlib>
#include <tuple>
#include <utility>
using namespace llvm;
#define DEBUG_TYPE "btf"
void MCBTFContext::addTypeEntry(std::unique_ptr<BTFTypeEntry> Entry) {
TypeEntries.push_back(std::move(Entry));
}
void MCBTFContext::dump(raw_ostream &OS) {
OS << "Type Table:\n";
for (size_t i = 0; i < TypeEntries.size(); i++) {
auto TypeEntry = TypeEntries[i].get();
TypeEntry->print(OS, *this);
}
OS << "\nString Table:\n";
StringTable.showTable(OS);
OS << "\nFuncInfo Table:\n";
for (auto &FuncSec : FuncInfoTable) {
OS << "sec_name_off=" << FuncSec.first << "\n";
for (auto &FuncInfo : FuncSec.second) {
OS << "\tinsn_offset=<Omitted> type_id="
<< FuncInfo.TypeId << "\n";
}
}
OS << "\nLineInfo Table:\n";
for (auto &LineSec : LineInfoTable) {
OS << "sec_name_off=" << LineSec.first << "\n";
for (auto &LineInfo : LineSec.second) {
OS << "\tinsn_offset=<Omitted> file_name_off="
<< LineInfo.FileNameOff
<< " line_off=" << LineInfo.LineOff
<< " line_num=" << LineInfo.LineNum
<< " column_num=" << LineInfo.ColumnNum
<< "\n";
}
}
}
void MCBTFContext::emitCommonHeader(MCObjectStreamer *MCOS) {
MCOS->EmitIntValue(BTF_MAGIC, 2);
MCOS->EmitIntValue(BTF_VERSION, 1);
MCOS->EmitIntValue(0, 1);
}
void MCBTFContext::emitBTFSection(MCObjectStreamer *MCOS) {
MCContext &context = MCOS->getContext();
MCOS->SwitchSection(context.getObjectFileInfo()->getBTFSection());
// emit header
emitCommonHeader(MCOS);
MCOS->EmitIntValue(sizeof(struct btf_header), 4);
uint32_t type_len = 0, str_len;
for (auto &TypeEntry : TypeEntries)
type_len += TypeEntry->getSize();
str_len = StringTable.getSize();
MCOS->EmitIntValue(0, 4);
MCOS->EmitIntValue(type_len, 4);
MCOS->EmitIntValue(type_len, 4);
MCOS->EmitIntValue(str_len, 4);
// emit type table
for (auto &TypeEntry: TypeEntries)
TypeEntry->emitData(MCOS);
// emit string table
for (auto &S : StringTable.getTable()) {
for (auto C : S)
MCOS->EmitIntValue(C, 1);
MCOS->EmitIntValue('\0', 1);
}
}
void MCBTFContext::emitBTFExtSection(MCObjectStreamer *MCOS) {
MCContext &context = MCOS->getContext();
MCOS->SwitchSection(context.getObjectFileInfo()->getBTFExtSection());
// emit header
emitCommonHeader(MCOS);
MCOS->EmitIntValue(sizeof(struct btf_ext_header), 4);
uint32_t func_len = 0, line_len = 0;
for (auto &FuncSec : FuncInfoTable) {
func_len += sizeof(struct btf_sec_func_info);
func_len += FuncSec.second.size() * sizeof(struct bpf_func_info);
}
for (auto &LineSec : LineInfoTable) {
line_len += sizeof(struct btf_sec_line_info);
line_len += LineSec.second.size() * sizeof(struct bpf_line_info);
}
MCOS->EmitIntValue(0, 4);
MCOS->EmitIntValue(func_len, 4);
MCOS->EmitIntValue(func_len, 4);
MCOS->EmitIntValue(line_len, 4);
// emit func_info table
for (const auto &FuncSec : FuncInfoTable) {
MCOS->EmitIntValue(FuncSec.first, 4);
MCOS->EmitIntValue(FuncSec.second.size(), 4);
for (const auto &FuncInfo : FuncSec.second) {
MCOS->EmitBTFAdvanceLineAddr(FuncInfo.Label, 4);
MCOS->EmitIntValue(FuncInfo.TypeId, 4);
}
}
// emit line_info table
for (const auto &LineSec : LineInfoTable) {
MCOS->EmitIntValue(LineSec.first, 4);
MCOS->EmitIntValue(LineSec.second.size(), 4);
for (const auto &LineInfo : LineSec.second) {
MCOS->EmitBTFAdvanceLineAddr(LineInfo.Label, 4);
MCOS->EmitIntValue(LineInfo.FileNameOff, 4);
MCOS->EmitIntValue(LineInfo.LineOff, 4);
MCOS->EmitIntValue(LineInfo.LineNum << 10 | LineInfo.ColumnNum, 4);
}
}
}
void MCBTFContext::emitAll(MCObjectStreamer *MCOS) {
LLVM_DEBUG(dump(dbgs()));
emitBTFSection(MCOS);
emitBTFExtSection(MCOS);
}
void BTFTypeEntry::print(raw_ostream &OS, MCBTFContext& MCBTFContext) {
OS << "[" << Id << "] "
<< btf_kind_str[BTF_INFO_KIND(BTFType.info)]
<< " name_off=" << BTFType.name_off
<< " info=" << format("0x%08lx", BTFType.info)
<< " size/type=" << BTFType.size << "\n";
}
void BTFTypeEntry::emitData(MCObjectStreamer *MCOS) {
MCOS->EmitIntValue(BTFType.name_off, 4);
MCOS->EmitIntValue(BTFType.info, 4);
MCOS->EmitIntValue(BTFType.size, 4);
}
void BTFTypeEntryInt::print(raw_ostream &OS, MCBTFContext& MCBTFContext) {
BTFTypeEntry::print(OS, MCBTFContext);
OS << "\tdesc=" << format("0x%08lx", IntVal) << "\n";
}
void BTFTypeEntryInt::emitData(MCObjectStreamer *MCOS) {
BTFTypeEntry::emitData(MCOS);
MCOS->EmitIntValue(IntVal, 4);
}
void BTFTypeEntryEnum::print(raw_ostream &OS, MCBTFContext& MCBTFContext) {
BTFTypeEntry::print(OS, MCBTFContext);
for (size_t i = 0; i < BTF_INFO_VLEN(BTFType.info); i++) {
auto &EnumValue = EnumValues[i];
OS << "\tname_off=" << EnumValue.name_off
<< " value=" << EnumValue.val << "\n";
}
}
void BTFTypeEntryEnum::emitData(MCObjectStreamer *MCOS) {
BTFTypeEntry::emitData(MCOS);
for (auto &EnumValue : EnumValues) {
MCOS->EmitIntValue(EnumValue.name_off, 4);
MCOS->EmitIntValue(EnumValue.val, 4);
}
}
void BTFTypeEntryArray::print(raw_ostream &OS, MCBTFContext& MCBTFContext) {
BTFTypeEntry::print(OS, MCBTFContext);
OS << "\telem_type=" << format("0x%08lx", ArrayInfo.type)
<< " index_type=" << format("0x%08lx", ArrayInfo.index_type)
<< " num_element=" << ArrayInfo.nelems << "\n";
}
void BTFTypeEntryArray::emitData(MCObjectStreamer *MCOS) {
BTFTypeEntry::emitData(MCOS);
MCOS->EmitIntValue(ArrayInfo.type, 4);
MCOS->EmitIntValue(ArrayInfo.index_type, 4);
MCOS->EmitIntValue(ArrayInfo.nelems, 4);
}
void BTFTypeEntryStruct::print(raw_ostream &OS, MCBTFContext& MCBTFContext) {
BTFTypeEntry::print(OS, MCBTFContext);
for (size_t i = 0; i < BTF_INFO_VLEN(BTFType.info); i++) {
auto &Member = Members[i];
OS << "\tname_off=" << Member.name_off
<< " type=" << Member.type
<< " bit_offset=" << Member.offset << "\n";
}
}
void BTFTypeEntryStruct::emitData(MCObjectStreamer *MCOS) {
BTFTypeEntry::emitData(MCOS);
for (auto &Member : Members) {
MCOS->EmitIntValue(Member.name_off, 4);
MCOS->EmitIntValue(Member.type, 4);
MCOS->EmitIntValue(Member.offset, 4);
}
}
void BTFTypeEntryFunc::print(raw_ostream &OS, MCBTFContext& MCBTFContext) {
BTFTypeEntry::print(OS, MCBTFContext);
for (size_t i = 0; i < BTF_INFO_VLEN(BTFType.info); i++) {
auto Parameter = Parameters[i];
OS << "\tparam_type=" << Parameter << "\n";
}
}
void BTFTypeEntryFunc::emitData(MCObjectStreamer *MCOS) {
BTFTypeEntry::emitData(MCOS);
for (auto &Parameter: Parameters)
MCOS->EmitIntValue(Parameter, 4);
}
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