mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-23 12:40:17 +00:00
6dd7893e8c
* std::string::append(int, int) can be ambiguous. * std::vector<>::data() is a C++11 feature, use ArrayRef abstraction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192542 91177308-0d34-0410-b5e6-96231b3b80d8
289 lines
9.6 KiB
C++
289 lines
9.6 KiB
C++
//===- yaml2coff - Convert YAML to a COFF object file ---------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// \brief The COFF component of yaml2obj.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "yaml2obj.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "llvm/ADT/StringMap.h"
|
|
#include "llvm/ADT/StringSwitch.h"
|
|
#include "llvm/Object/COFFYAML.h"
|
|
#include "llvm/Support/Endian.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include <vector>
|
|
|
|
using namespace llvm;
|
|
|
|
/// This parses a yaml stream that represents a COFF object file.
|
|
/// See docs/yaml2obj for the yaml scheema.
|
|
struct COFFParser {
|
|
COFFParser(COFFYAML::Object &Obj) : Obj(Obj) {
|
|
// A COFF string table always starts with a 4 byte size field. Offsets into
|
|
// it include this size, so allocate it now.
|
|
StringTable.append(4, char(0));
|
|
}
|
|
|
|
bool parseSections() {
|
|
for (std::vector<COFFYAML::Section>::iterator i = Obj.Sections.begin(),
|
|
e = Obj.Sections.end(); i != e; ++i) {
|
|
COFFYAML::Section &Sec = *i;
|
|
|
|
// If the name is less than 8 bytes, store it in place, otherwise
|
|
// store it in the string table.
|
|
StringRef Name = Sec.Name;
|
|
|
|
if (Name.size() <= COFF::NameSize) {
|
|
std::copy(Name.begin(), Name.end(), Sec.Header.Name);
|
|
} else {
|
|
// Add string to the string table and format the index for output.
|
|
unsigned Index = getStringIndex(Name);
|
|
std::string str = utostr(Index);
|
|
if (str.size() > 7) {
|
|
errs() << "String table got too large";
|
|
return false;
|
|
}
|
|
Sec.Header.Name[0] = '/';
|
|
std::copy(str.begin(), str.end(), Sec.Header.Name + 1);
|
|
}
|
|
|
|
Sec.Header.Characteristics |= (Log2_32(Sec.Alignment) + 1) << 20;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool parseSymbols() {
|
|
for (std::vector<COFFYAML::Symbol>::iterator i = Obj.Symbols.begin(),
|
|
e = Obj.Symbols.end(); i != e; ++i) {
|
|
COFFYAML::Symbol &Sym = *i;
|
|
|
|
// If the name is less than 8 bytes, store it in place, otherwise
|
|
// store it in the string table.
|
|
StringRef Name = Sym.Name;
|
|
if (Name.size() <= COFF::NameSize) {
|
|
std::copy(Name.begin(), Name.end(), Sym.Header.Name);
|
|
} else {
|
|
// Add string to the string table and format the index for output.
|
|
unsigned Index = getStringIndex(Name);
|
|
*reinterpret_cast<support::aligned_ulittle32_t*>(
|
|
Sym.Header.Name + 4) = Index;
|
|
}
|
|
|
|
Sym.Header.Type = Sym.SimpleType;
|
|
Sym.Header.Type |= Sym.ComplexType << COFF::SCT_COMPLEX_TYPE_SHIFT;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool parse() {
|
|
if (!parseSections())
|
|
return false;
|
|
if (!parseSymbols())
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
unsigned getStringIndex(StringRef Str) {
|
|
StringMap<unsigned>::iterator i = StringTableMap.find(Str);
|
|
if (i == StringTableMap.end()) {
|
|
unsigned Index = StringTable.size();
|
|
StringTable.append(Str.begin(), Str.end());
|
|
StringTable.push_back(0);
|
|
StringTableMap[Str] = Index;
|
|
return Index;
|
|
}
|
|
return i->second;
|
|
}
|
|
|
|
COFFYAML::Object &Obj;
|
|
|
|
StringMap<unsigned> StringTableMap;
|
|
std::string StringTable;
|
|
};
|
|
|
|
// Take a CP and assign addresses and sizes to everything. Returns false if the
|
|
// layout is not valid to do.
|
|
static bool layoutCOFF(COFFParser &CP) {
|
|
uint32_t SectionTableStart = 0;
|
|
uint32_t SectionTableSize = 0;
|
|
|
|
// The section table starts immediately after the header, including the
|
|
// optional header.
|
|
SectionTableStart = sizeof(COFF::header) + CP.Obj.Header.SizeOfOptionalHeader;
|
|
SectionTableSize = sizeof(COFF::section) * CP.Obj.Sections.size();
|
|
|
|
uint32_t CurrentSectionDataOffset = SectionTableStart + SectionTableSize;
|
|
|
|
// Assign each section data address consecutively.
|
|
for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(),
|
|
e = CP.Obj.Sections.end();
|
|
i != e; ++i) {
|
|
if (i->SectionData.binary_size() > 0) {
|
|
i->Header.SizeOfRawData = i->SectionData.binary_size();
|
|
i->Header.PointerToRawData = CurrentSectionDataOffset;
|
|
CurrentSectionDataOffset += i->Header.SizeOfRawData;
|
|
if (!i->Relocations.empty()) {
|
|
i->Header.PointerToRelocations = CurrentSectionDataOffset;
|
|
i->Header.NumberOfRelocations = i->Relocations.size();
|
|
CurrentSectionDataOffset += i->Header.NumberOfRelocations *
|
|
COFF::RelocationSize;
|
|
}
|
|
// TODO: Handle alignment.
|
|
} else {
|
|
i->Header.SizeOfRawData = 0;
|
|
i->Header.PointerToRawData = 0;
|
|
}
|
|
}
|
|
|
|
uint32_t SymbolTableStart = CurrentSectionDataOffset;
|
|
|
|
// Calculate number of symbols.
|
|
uint32_t NumberOfSymbols = 0;
|
|
for (std::vector<COFFYAML::Symbol>::iterator i = CP.Obj.Symbols.begin(),
|
|
e = CP.Obj.Symbols.end();
|
|
i != e; ++i) {
|
|
unsigned AuxBytes = i->AuxiliaryData.binary_size();
|
|
if (AuxBytes % COFF::SymbolSize != 0) {
|
|
errs() << "AuxiliaryData size not a multiple of symbol size!\n";
|
|
return false;
|
|
}
|
|
i->Header.NumberOfAuxSymbols = AuxBytes / COFF::SymbolSize;
|
|
NumberOfSymbols += 1 + i->Header.NumberOfAuxSymbols;
|
|
}
|
|
|
|
// Store all the allocated start addresses in the header.
|
|
CP.Obj.Header.NumberOfSections = CP.Obj.Sections.size();
|
|
CP.Obj.Header.NumberOfSymbols = NumberOfSymbols;
|
|
CP.Obj.Header.PointerToSymbolTable = SymbolTableStart;
|
|
|
|
*reinterpret_cast<support::ulittle32_t *>(&CP.StringTable[0])
|
|
= CP.StringTable.size();
|
|
|
|
return true;
|
|
}
|
|
|
|
template <typename value_type>
|
|
struct binary_le_impl {
|
|
value_type Value;
|
|
binary_le_impl(value_type V) : Value(V) {}
|
|
};
|
|
|
|
template <typename value_type>
|
|
raw_ostream &operator <<( raw_ostream &OS
|
|
, const binary_le_impl<value_type> &BLE) {
|
|
char Buffer[sizeof(BLE.Value)];
|
|
support::endian::write<value_type, support::little, support::unaligned>(
|
|
Buffer, BLE.Value);
|
|
OS.write(Buffer, sizeof(BLE.Value));
|
|
return OS;
|
|
}
|
|
|
|
template <typename value_type>
|
|
binary_le_impl<value_type> binary_le(value_type V) {
|
|
return binary_le_impl<value_type>(V);
|
|
}
|
|
|
|
bool writeCOFF(COFFParser &CP, raw_ostream &OS) {
|
|
OS << binary_le(CP.Obj.Header.Machine)
|
|
<< binary_le(CP.Obj.Header.NumberOfSections)
|
|
<< binary_le(CP.Obj.Header.TimeDateStamp)
|
|
<< binary_le(CP.Obj.Header.PointerToSymbolTable)
|
|
<< binary_le(CP.Obj.Header.NumberOfSymbols)
|
|
<< binary_le(CP.Obj.Header.SizeOfOptionalHeader)
|
|
<< binary_le(CP.Obj.Header.Characteristics);
|
|
|
|
// Output section table.
|
|
for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(),
|
|
e = CP.Obj.Sections.end();
|
|
i != e; ++i) {
|
|
OS.write(i->Header.Name, COFF::NameSize);
|
|
OS << binary_le(i->Header.VirtualSize)
|
|
<< binary_le(i->Header.VirtualAddress)
|
|
<< binary_le(i->Header.SizeOfRawData)
|
|
<< binary_le(i->Header.PointerToRawData)
|
|
<< binary_le(i->Header.PointerToRelocations)
|
|
<< binary_le(i->Header.PointerToLineNumbers)
|
|
<< binary_le(i->Header.NumberOfRelocations)
|
|
<< binary_le(i->Header.NumberOfLineNumbers)
|
|
<< binary_le(i->Header.Characteristics);
|
|
}
|
|
|
|
unsigned CurSymbol = 0;
|
|
StringMap<unsigned> SymbolTableIndexMap;
|
|
for (std::vector<COFFYAML::Symbol>::iterator I = CP.Obj.Symbols.begin(),
|
|
E = CP.Obj.Symbols.end();
|
|
I != E; ++I) {
|
|
SymbolTableIndexMap[I->Name] = CurSymbol;
|
|
CurSymbol += 1 + I->Header.NumberOfAuxSymbols;
|
|
}
|
|
|
|
// Output section data.
|
|
for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(),
|
|
e = CP.Obj.Sections.end();
|
|
i != e; ++i) {
|
|
i->SectionData.writeAsBinary(OS);
|
|
for (unsigned I2 = 0, E2 = i->Relocations.size(); I2 != E2; ++I2) {
|
|
const COFFYAML::Relocation &R = i->Relocations[I2];
|
|
uint32_t SymbolTableIndex = SymbolTableIndexMap[R.SymbolName];
|
|
OS << binary_le(R.VirtualAddress)
|
|
<< binary_le(SymbolTableIndex)
|
|
<< binary_le(R.Type);
|
|
}
|
|
}
|
|
|
|
// Output symbol table.
|
|
|
|
for (std::vector<COFFYAML::Symbol>::const_iterator i = CP.Obj.Symbols.begin(),
|
|
e = CP.Obj.Symbols.end();
|
|
i != e; ++i) {
|
|
OS.write(i->Header.Name, COFF::NameSize);
|
|
OS << binary_le(i->Header.Value)
|
|
<< binary_le(i->Header.SectionNumber)
|
|
<< binary_le(i->Header.Type)
|
|
<< binary_le(i->Header.StorageClass)
|
|
<< binary_le(i->Header.NumberOfAuxSymbols);
|
|
i->AuxiliaryData.writeAsBinary(OS);
|
|
}
|
|
|
|
// Output string table.
|
|
OS.write(&CP.StringTable[0], CP.StringTable.size());
|
|
return true;
|
|
}
|
|
|
|
int yaml2coff(llvm::raw_ostream &Out, llvm::MemoryBuffer *Buf) {
|
|
yaml::Input YIn(Buf->getBuffer());
|
|
COFFYAML::Object Doc;
|
|
YIn >> Doc;
|
|
if (YIn.error()) {
|
|
errs() << "yaml2obj: Failed to parse YAML file!\n";
|
|
return 1;
|
|
}
|
|
|
|
COFFParser CP(Doc);
|
|
if (!CP.parse()) {
|
|
errs() << "yaml2obj: Failed to parse YAML file!\n";
|
|
return 1;
|
|
}
|
|
|
|
if (!layoutCOFF(CP)) {
|
|
errs() << "yaml2obj: Failed to layout COFF file!\n";
|
|
return 1;
|
|
}
|
|
if (!writeCOFF(CP, Out)) {
|
|
errs() << "yaml2obj: Failed to write COFF file!\n";
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|