//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "WinCOFFObjectWriter"
-
#include "llvm/MC/MCWinCOFFObjectWriter.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
using namespace llvm;
+#define DEBUG_TYPE "WinCOFFObjectWriter"
+
namespace {
typedef SmallString<COFF::NameSize> name;
void MakeSymbolReal(COFFSymbol &S, size_t Index);
void MakeSectionReal(COFFSection &S, size_t Number);
- bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
+ bool ExportSymbol(const MCSymbol &Symbol, MCAssembler &Asm);
bool IsPhysicalSection(COFFSection *S);
COFFSection *coff_section = createSection(Sec.getSectionName());
COFFSymbol *coff_symbol = createSymbol(Sec.getSectionName());
+ if (Sec.getSelection() != COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) {
+ if (const MCSymbol *S = Sec.getCOMDATSymbol()) {
+ COFFSymbol *COMDATSymbol = GetOrCreateCOFFSymbol(S);
+ if (COMDATSymbol->Section)
+ report_fatal_error("two sections have the same comdat");
+ COMDATSymbol->Section = coff_section;
+ }
+ }
coff_section->Symbol = coff_symbol;
coff_symbol->Section = coff_section;
SectionMap[&SectionData.getSection()] = coff_section;
}
+static uint64_t getSymbolValue(const MCSymbolData &Data,
+ const MCAsmLayout &Layout) {
+ if (Data.isCommon() && Data.isExternal())
+ return Data.getCommonSize();
+
+ uint64_t Res;
+ if (!Layout.getSymbolOffset(&Data, Res))
+ return 0;
+
+ return Res;
+}
+
/// This function takes a symbol data object from the assembler
/// and creates the associated COFF symbol staging object.
void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
coff_symbol->MCData = &SymbolData;
} else {
- const MCSymbolData &ResSymData =
- Assembler.getSymbolData(Symbol.AliasedSymbol());
-
- if (Symbol.isVariable()) {
- int64_t Addr;
- if (Symbol.getVariableValue()->EvaluateAsAbsolute(Addr, Layout))
- coff_symbol->Data.Value = Addr;
- } else if (SymbolData.isExternal() && SymbolData.isCommon()) {
- coff_symbol->Data.Value = SymbolData.getCommonSize();
- }
+ const MCSymbolData &ResSymData = Assembler.getSymbolData(Symbol);
+ const MCSymbol *Base = Layout.getBaseSymbol(Symbol);
+ coff_symbol->Data.Value = getSymbolValue(ResSymData, Layout);
coff_symbol->Data.Type = (ResSymData.getFlags() & 0x0000FFFF) >> 0;
coff_symbol->Data.StorageClass = (ResSymData.getFlags() & 0x00FF0000) >> 16;
// If no storage class was specified in the streamer, define it here.
if (coff_symbol->Data.StorageClass == 0) {
- bool external = ResSymData.isExternal() || !ResSymData.Fragment;
+ bool IsExternal =
+ ResSymData.isExternal() ||
+ (!ResSymData.getFragment() && !ResSymData.getSymbol().isVariable());
- coff_symbol->Data.StorageClass =
- external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
+ coff_symbol->Data.StorageClass = IsExternal
+ ? COFF::IMAGE_SYM_CLASS_EXTERNAL
+ : COFF::IMAGE_SYM_CLASS_STATIC;
}
- if (Symbol.isAbsolute() || Symbol.AliasedSymbol().isVariable())
+ if (!Base) {
coff_symbol->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
- else if (ResSymData.Fragment)
- coff_symbol->Section =
- SectionMap[&ResSymData.Fragment->getParent()->getSection()];
+ } else {
+ const MCSymbolData &BaseData = Assembler.getSymbolData(*Base);
+ if (BaseData.Fragment) {
+ COFFSection *Sec =
+ SectionMap[&BaseData.Fragment->getParent()->getSection()];
+
+ if (coff_symbol->Section && coff_symbol->Section != Sec)
+ report_fatal_error("conflicting sections for symbol");
+
+ coff_symbol->Section = Sec;
+ }
+ }
coff_symbol->MCData = &ResSymData;
}
S.Index = Index;
}
-bool WinCOFFObjectWriter::ExportSymbol(MCSymbolData const &SymbolData,
+bool WinCOFFObjectWriter::ExportSymbol(const MCSymbol &Symbol,
MCAssembler &Asm) {
// This doesn't seem to be right. Strings referred to from the .data section
// need symbols so they can be linked to code in the .text section right?
- // return Asm.isSymbolLinkerVisible (&SymbolData);
+ // return Asm.isSymbolLinkerVisible(Symbol);
+
+ // Non-temporary labels should always be visible to the linker.
+ if (!Symbol.isTemporary())
+ return true;
+
+ // Absolute temporary labels are never visible.
+ if (!Symbol.isInSection())
+ return false;
// For now, all non-variable symbols are exported,
// the linker will sort the rest out for us.
- return SymbolData.isExternal() || !SymbolData.getSymbol().isVariable();
+ return !Symbol.isVariable();
}
bool WinCOFFObjectWriter::IsPhysicalSection(COFFSection *S) {
// "Define" each section & symbol. This creates section & symbol
// entries in the staging area.
- static_assert(sizeof(((COFF::AuxiliaryFile *)0)->FileName) == COFF::SymbolSize,
+ static_assert(sizeof(((COFF::AuxiliaryFile *)nullptr)->FileName) == COFF::SymbolSize,
"size mismatch for COFF::AuxiliaryFile::FileName");
for (auto FI = Asm.file_names_begin(), FE = Asm.file_names_end();
FI != FE; ++FI) {
unsigned Count = (FI->size() + COFF::SymbolSize - 1) / COFF::SymbolSize;
COFFSymbol *file = createSymbol(".file");
+ file->Data.SectionNumber = COFF::IMAGE_SYM_DEBUG;
file->Data.StorageClass = COFF::IMAGE_SYM_CLASS_FILE;
file->Aux.resize(Count);
}
}
- for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; i++)
- DefineSection(*i);
+ for (const auto & Section : Asm)
+ DefineSection(Section);
- for (MCAssembler::const_symbol_iterator i = Asm.symbol_begin(),
- e = Asm.symbol_end();
- i != e; i++) {
- if (ExportSymbol(*i, Asm)) {
- DefineSymbol(*i, Asm, Layout);
- }
- }
+ for (MCSymbolData &SD : Asm.symbols())
+ if (ExportSymbol(SD.getSymbol(), Asm))
+ DefineSymbol(SD, Asm, Layout);
}
void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
Fixup.getLoc(),
Twine("symbol '") + A.getName() + "' can not be undefined");
- MCSymbolData &A_SD = Asm.getSymbolData(A);
+ const MCSymbolData &A_SD = Asm.getSymbolData(A);
MCSectionData const *SectionData = Fragment->getParent();
if (SymB) {
const MCSymbol *B = &SymB->getSymbol();
- MCSymbolData &B_SD = Asm.getSymbolData(*B);
+ const MCSymbolData &B_SD = Asm.getSymbolData(*B);
if (!B_SD.getFragment())
Asm.getContext().FatalError(
Fixup.getLoc(),
Reloc.Data.Type == COFF::IMAGE_REL_I386_REL32))
FixedValue += 4;
- coff_section->Relocations.push_back(Reloc);
+ if (Header.Machine == COFF::IMAGE_FILE_MACHINE_ARMNT) {
+ switch (Reloc.Data.Type) {
+ case COFF::IMAGE_REL_ARM_ABSOLUTE:
+ case COFF::IMAGE_REL_ARM_ADDR32:
+ case COFF::IMAGE_REL_ARM_ADDR32NB:
+ case COFF::IMAGE_REL_ARM_TOKEN:
+ case COFF::IMAGE_REL_ARM_SECTION:
+ case COFF::IMAGE_REL_ARM_SECREL:
+ break;
+ case COFF::IMAGE_REL_ARM_BRANCH11:
+ case COFF::IMAGE_REL_ARM_BLX11:
+ // IMAGE_REL_ARM_BRANCH11 and IMAGE_REL_ARM_BLX11 are only used for
+ // pre-ARMv7, which implicitly rules it out of ARMNT (it would be valid
+ // for Windows CE).
+ case COFF::IMAGE_REL_ARM_BRANCH24:
+ case COFF::IMAGE_REL_ARM_BLX24:
+ case COFF::IMAGE_REL_ARM_MOV32A:
+ // IMAGE_REL_ARM_BRANCH24, IMAGE_REL_ARM_BLX24, IMAGE_REL_ARM_MOV32A are
+ // only used for ARM mode code, which is documented as being unsupported
+ // by Windows on ARM. Empirical proof indicates that masm is able to
+ // generate the relocations however the rest of the MSVC toolchain is
+ // unable to handle it.
+ llvm_unreachable("unsupported relocation");
+ break;
+ case COFF::IMAGE_REL_ARM_MOV32T:
+ break;
+ case COFF::IMAGE_REL_ARM_BRANCH20T:
+ case COFF::IMAGE_REL_ARM_BRANCH24T:
+ case COFF::IMAGE_REL_ARM_BLX23T:
+ // IMAGE_REL_BRANCH20T, IMAGE_REL_ARM_BRANCH24T, IMAGE_REL_ARM_BLX23T all
+ // perform a 4 byte adjustment to the relocation. Relative branches are
+ // offset by 4 on ARM, however, because there is no RELA relocations, all
+ // branches are offset by 4.
+ FixedValue = FixedValue + 4;
+ break;
+ }
+ }
+
+ if (TargetObjectWriter->recordRelocation(Fixup))
+ coff_section->Relocations.push_back(Reloc);
}
void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
Header.NumberOfSections = 0;
DenseMap<COFFSection *, uint16_t> SectionIndices;
- for (sections::iterator i = Sections.begin(),
- e = Sections.end(); i != e; i++) {
- if (Layout.getSectionAddressSize((*i)->MCData) > 0) {
- size_t Number = ++Header.NumberOfSections;
- SectionIndices[i->get()] = Number;
- MakeSectionReal(**i, Number);
- } else {
- (*i)->Number = -1;
- }
+ for (auto & Section : Sections) {
+ size_t Number = ++Header.NumberOfSections;
+ SectionIndices[Section.get()] = Number;
+ MakeSectionReal(*Section, Number);
}
Header.NumberOfSymbols = 0;
- for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
- COFFSymbol &coff_symbol = **i;
- MCSymbolData const *SymbolData = coff_symbol.MCData;
-
+ for (auto & Symbol : Symbols) {
// Update section number & offset for symbols that have them.
- if (SymbolData && SymbolData->Fragment) {
- assert(coff_symbol.Section != nullptr);
-
- coff_symbol.Data.SectionNumber = coff_symbol.Section->Number;
- coff_symbol.Data.Value = Layout.getFragmentOffset(SymbolData->Fragment)
- + SymbolData->Offset;
- }
+ if (Symbol->Section)
+ Symbol->Data.SectionNumber = Symbol->Section->Number;
- if (coff_symbol.should_keep()) {
- MakeSymbolReal(coff_symbol, Header.NumberOfSymbols++);
+ if (Symbol->should_keep()) {
+ MakeSymbolReal(*Symbol, Header.NumberOfSymbols++);
// Update auxiliary symbol info.
- coff_symbol.Data.NumberOfAuxSymbols = coff_symbol.Aux.size();
- Header.NumberOfSymbols += coff_symbol.Data.NumberOfAuxSymbols;
+ Symbol->Data.NumberOfAuxSymbols = Symbol->Aux.size();
+ Header.NumberOfSymbols += Symbol->Data.NumberOfAuxSymbols;
} else
- coff_symbol.Index = -1;
+ Symbol->Index = -1;
}
// Fixup weak external references.
- for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
- COFFSymbol &coff_symbol = **i;
- if (coff_symbol.Other) {
- assert(coff_symbol.Index != -1);
- assert(coff_symbol.Aux.size() == 1 &&
- "Symbol must contain one aux symbol!");
- assert(coff_symbol.Aux[0].AuxType == ATWeakExternal &&
+ for (auto & Symbol : Symbols) {
+ if (Symbol->Other) {
+ assert(Symbol->Index != -1);
+ assert(Symbol->Aux.size() == 1 && "Symbol must contain one aux symbol!");
+ assert(Symbol->Aux[0].AuxType == ATWeakExternal &&
"Symbol's aux symbol must be a Weak External!");
- coff_symbol.Aux[0].Aux.WeakExternal.TagIndex = coff_symbol.Other->Index;
+ Symbol->Aux[0].Aux.WeakExternal.TagIndex = Symbol->Other->Index;
}
}
// Fixup associative COMDAT sections.
- for (sections::iterator i = Sections.begin(),
- e = Sections.end(); i != e; i++) {
- if ((*i)->Symbol->Aux[0].Aux.SectionDefinition.Selection !=
+ for (auto & Section : Sections) {
+ if (Section->Symbol->Aux[0].Aux.SectionDefinition.Selection !=
COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
continue;
- const MCSectionCOFF &MCSec = static_cast<const MCSectionCOFF &>(
- (*i)->MCData->getSection());
+ const MCSectionCOFF &MCSec =
+ static_cast<const MCSectionCOFF &>(Section->MCData->getSection());
- COFFSection *Assoc = SectionMap.lookup(MCSec.getAssocSection());
- if (!Assoc) {
- report_fatal_error(Twine("Missing associated COMDAT section ") +
- MCSec.getAssocSection()->getSectionName() +
- " for section " + MCSec.getSectionName());
- }
+ const MCSymbol *COMDAT = MCSec.getCOMDATSymbol();
+ assert(COMDAT);
+ COFFSymbol *COMDATSymbol = GetOrCreateCOFFSymbol(COMDAT);
+ assert(COMDATSymbol);
+ COFFSection *Assoc = COMDATSymbol->Section;
+ if (!Assoc)
+ report_fatal_error(
+ Twine("Missing associated COMDAT section for section ") +
+ MCSec.getSectionName());
// Skip this section if the associated section is unused.
if (Assoc->Number == -1)
continue;
- (*i)->Symbol->Aux[0].Aux.SectionDefinition.Number = SectionIndices[Assoc];
+ Section->Symbol->Aux[0].Aux.SectionDefinition.Number = SectionIndices[Assoc];
}
offset += COFF::HeaderSize;
offset += COFF::SectionSize * Header.NumberOfSections;
- for (MCAssembler::const_iterator i = Asm.begin(),
- e = Asm.end();
- i != e; i++) {
- COFFSection *Sec = SectionMap[&i->getSection()];
+ for (const auto & Section : Asm) {
+ COFFSection *Sec = SectionMap[&Section.getSection()];
if (Sec->Number == -1)
continue;
- Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(i);
+ Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(&Section);
if (IsPhysicalSection(Sec)) {
Sec->Header.PointerToRawData = offset;
offset += COFF::RelocationSize * Sec->Relocations.size();
- for (relocations::iterator cr = Sec->Relocations.begin(),
- er = Sec->Relocations.end();
- cr != er; ++cr) {
- assert((*cr).Symb->Index != -1);
- (*cr).Data.SymbolTableIndex = (*cr).Symb->Index;
+ for (auto & Relocation : Sec->Relocations) {
+ assert(Relocation.Symb->Index != -1);
+ Relocation.Data.SymbolTableIndex = Relocation.Symb->Index;
}
}
- assert(Sec->Symbol->Aux.size() == 1
- && "Section's symbol must have one aux!");
+ assert(Sec->Symbol->Aux.size() == 1 &&
+ "Section's symbol must have one aux!");
AuxSymbol &Aux = Sec->Symbol->Aux[0];
assert(Aux.AuxType == ATSectionDefinition &&
"Section's symbol's aux symbol must be a Section Definition!");
sections::iterator i, ie;
MCAssembler::const_iterator j, je;
- for (i = Sections.begin(), ie = Sections.end(); i != ie; i++)
- if ((*i)->Number != -1) {
- if ((*i)->Relocations.size() >= 0xffff) {
- (*i)->Header.Characteristics |= COFF::IMAGE_SCN_LNK_NRELOC_OVFL;
- }
- WriteSectionHeader((*i)->Header);
+ for (auto & Section : Sections) {
+ if (Section->Number != -1) {
+ if (Section->Relocations.size() >= 0xffff)
+ Section->Header.Characteristics |= COFF::IMAGE_SCN_LNK_NRELOC_OVFL;
+ WriteSectionHeader(Section->Header);
}
+ }
for (i = Sections.begin(), ie = Sections.end(),
j = Asm.begin(), je = Asm.end();
WriteRelocation(r);
}
- for (relocations::const_iterator k = (*i)->Relocations.begin(),
- ke = (*i)->Relocations.end();
- k != ke; k++) {
- WriteRelocation(k->Data);
- }
+ for (const auto & Relocation : (*i)->Relocations)
+ WriteRelocation(Relocation.Data);
} else
assert((*i)->Header.PointerToRelocations == 0 &&
"Section::PointerToRelocations is insane!");
assert(OS.tell() == Header.PointerToSymbolTable &&
"Header::PointerToSymbolTable is insane!");
- for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++)
- if ((*i)->Index != -1)
- WriteSymbol(**i);
+ for (auto & Symbol : Symbols)
+ if (Symbol->Index != -1)
+ WriteSymbol(*Symbol);
OS.write((char const *)&Strings.Data.front(), Strings.Data.size());
}
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