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-rw-r--r--lib/MC/WinCOFFObjectWriter.cpp89
1 files changed, 53 insertions, 36 deletions
diff --git a/lib/MC/WinCOFFObjectWriter.cpp b/lib/MC/WinCOFFObjectWriter.cpp
index b15e225..f706cac 100644
--- a/lib/MC/WinCOFFObjectWriter.cpp
+++ b/lib/MC/WinCOFFObjectWriter.cpp
@@ -22,8 +22,10 @@
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCWinCOFFObjectWriter.h"
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
@@ -33,8 +35,6 @@
#include "llvm/Support/TimeValue.h"
-#include "../Target/X86/MCTargetDesc/X86FixupKinds.h"
-
#include <cstdio>
using namespace llvm;
@@ -128,8 +128,9 @@ public:
typedef DenseMap<MCSymbol const *, COFFSymbol *> symbol_map;
typedef DenseMap<MCSection const *, COFFSection *> section_map;
+ llvm::OwningPtr<MCWinCOFFObjectTargetWriter> TargetObjectWriter;
+
// Root level file contents.
- bool Is64Bit;
COFF::header Header;
sections Sections;
symbols Symbols;
@@ -139,7 +140,7 @@ public:
section_map SectionMap;
symbol_map SymbolMap;
- WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit);
+ WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW, raw_ostream &OS);
~WinCOFFObjectWriter();
COFFSymbol *createSymbol(StringRef Name);
@@ -281,6 +282,7 @@ StringTable::StringTable() {
// The string table data begins with the length of the entire string table
// including the length header. Allocate space for this header.
Data.resize(4);
+ update_length();
}
size_t StringTable::size() const {
@@ -313,13 +315,13 @@ size_t StringTable::insert(llvm::StringRef String) {
//------------------------------------------------------------------------------
// WinCOFFObjectWriter class implementation
-WinCOFFObjectWriter::WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit)
+WinCOFFObjectWriter::WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW,
+ raw_ostream &OS)
: MCObjectWriter(OS, true)
- , Is64Bit(is64Bit) {
+ , TargetObjectWriter(MOTW) {
memset(&Header, 0, sizeof(Header));
- Is64Bit ? Header.Machine = COFF::IMAGE_FILE_MACHINE_AMD64
- : Header.Machine = COFF::IMAGE_FILE_MACHINE_I386;
+ Header.Machine = TargetObjectWriter->getMachine();
}
WinCOFFObjectWriter::~WinCOFFObjectWriter() {
@@ -694,30 +696,13 @@ void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
if (CrossSection)
FixupKind = FK_PCRel_4;
- switch (FixupKind) {
- case FK_PCRel_4:
- case X86::reloc_riprel_4byte:
- case X86::reloc_riprel_4byte_movq_load:
- Reloc.Data.Type = Is64Bit ? COFF::IMAGE_REL_AMD64_REL32
- : COFF::IMAGE_REL_I386_REL32;
- // FIXME: Can anyone explain what this does other than adjust for the size
- // of the offset?
+ Reloc.Data.Type = TargetObjectWriter->getRelocType(FixupKind);
+
+ // FIXME: Can anyone explain what this does other than adjust for the size
+ // of the offset?
+ if (Reloc.Data.Type == COFF::IMAGE_REL_AMD64_REL32 ||
+ Reloc.Data.Type == COFF::IMAGE_REL_I386_REL32)
FixedValue += 4;
- break;
- case FK_Data_4:
- case X86::reloc_signed_4byte:
- Reloc.Data.Type = Is64Bit ? COFF::IMAGE_REL_AMD64_ADDR32
- : COFF::IMAGE_REL_I386_DIR32;
- break;
- case FK_Data_8:
- if (Is64Bit)
- Reloc.Data.Type = COFF::IMAGE_REL_AMD64_ADDR64;
- else
- llvm_unreachable("unsupported relocation type");
- break;
- default:
- llvm_unreachable("unsupported relocation type");
- }
coff_section->Relocations.push_back(Reloc);
}
@@ -798,9 +783,22 @@ void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
}
if (Sec->Relocations.size() > 0) {
- Sec->Header.NumberOfRelocations = Sec->Relocations.size();
+ bool RelocationsOverflow = Sec->Relocations.size() >= 0xffff;
+
+ if (RelocationsOverflow) {
+ // Signal overflow by setting NumberOfSections to max value. Actual
+ // size is found in reloc #0. Microsoft tools understand this.
+ Sec->Header.NumberOfRelocations = 0xffff;
+ } else {
+ Sec->Header.NumberOfRelocations = Sec->Relocations.size();
+ }
Sec->Header.PointerToRelocations = offset;
+ if (RelocationsOverflow) {
+ // Reloc #0 will contain actual count, so make room for it.
+ offset += COFF::RelocationSize;
+ }
+
offset += COFF::RelocationSize * Sec->Relocations.size();
for (relocations::iterator cr = Sec->Relocations.begin(),
@@ -835,8 +833,12 @@ void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
MCAssembler::const_iterator j, je;
for (i = Sections.begin(), ie = Sections.end(); i != ie; i++)
- if ((*i)->Number != -1)
+ if ((*i)->Number != -1) {
+ if ((*i)->Relocations.size() >= 0xffff) {
+ (*i)->Header.Characteristics |= COFF::IMAGE_SCN_LNK_NRELOC_OVFL;
+ }
WriteSectionHeader((*i)->Header);
+ }
for (i = Sections.begin(), ie = Sections.end(),
j = Asm.begin(), je = Asm.end();
@@ -849,13 +851,23 @@ void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
assert(OS.tell() == (*i)->Header.PointerToRawData &&
"Section::PointerToRawData is insane!");
- Asm.WriteSectionData(j, Layout);
+ Asm.writeSectionData(j, Layout);
}
if ((*i)->Relocations.size() > 0) {
assert(OS.tell() == (*i)->Header.PointerToRelocations &&
"Section::PointerToRelocations is insane!");
+ if ((*i)->Relocations.size() >= 0xffff) {
+ // In case of overflow, write actual relocation count as first
+ // relocation. Including the synthetic reloc itself (+ 1).
+ COFF::relocation r;
+ r.VirtualAddress = (*i)->Relocations.size() + 1;
+ r.SymbolTableIndex = 0;
+ r.Type = 0;
+ WriteRelocation(r);
+ }
+
for (relocations::const_iterator k = (*i)->Relocations.begin(),
ke = (*i)->Relocations.end();
k != ke; k++) {
@@ -877,11 +889,16 @@ void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
OS.write((char const *)&Strings.Data.front(), Strings.Data.size());
}
+MCWinCOFFObjectTargetWriter::MCWinCOFFObjectTargetWriter(unsigned Machine_) :
+ Machine(Machine_) {
+}
+
//------------------------------------------------------------------------------
// WinCOFFObjectWriter factory function
namespace llvm {
- MCObjectWriter *createWinCOFFObjectWriter(raw_ostream &OS, bool is64Bit) {
- return new WinCOFFObjectWriter(OS, is64Bit);
+ MCObjectWriter *createWinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW,
+ raw_ostream &OS) {
+ return new WinCOFFObjectWriter(MOTW, OS);
}
}
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