6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-13 04:38:24 +00:00
Code Issues Projects Releases Wiki Activity

Add support for subsections to the ELF assembler. Fixes PR8717.

Browse Source 
Differential Revision: http://llvm-reviews.chandlerc.com/D598

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179725 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2013-04-17 21:18:16 +00:00
parent 53c9def433
commit df39be6cb4
30 changed files with 288 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
lib/MC/MCObjectStreamer.cpp
View File

@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
@ -45,14 +46,15 @@ void MCObjectStreamer::reset() {
if (Assembler)
Assembler->reset();
CurSectionData = 0;
CurInsertionPoint = MCSectionData::iterator();
MCStreamer::reset();
}
MCFragment *MCObjectStreamer::getCurrentFragment() const {
assert(getCurrentSectionData() && "No current section!");
if (!getCurrentSectionData()->empty())
return &getCurrentSectionData()->getFragmentList().back();
if (CurInsertionPoint != getCurrentSectionData()->getFragmentList().begin())
return prior(CurInsertionPoint);
return 0;
}
@ -61,8 +63,10 @@ MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() const {
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
// When bundling is enabled, we don't want to add data to a fragment that
// already has instructions (see MCELFStreamer::EmitInstToData for details)
if (!F || (Assembler->isBundlingEnabled() && F->hasInstructions()))
F = new MCDataFragment(getCurrentSectionData());
if (!F || (Assembler->isBundlingEnabled() && F->hasInstructions())) {
F = new MCDataFragment();
insert(F);
}
return F;
}
@ -145,7 +149,7 @@ void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
return;
}
Value = ForceExpAbs(Value);
new MCLEBFragment(*Value, false, getCurrentSectionData());
insert(new MCLEBFragment(*Value, false));
}
void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
@ -155,7 +159,7 @@ void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
return;
}
Value = ForceExpAbs(Value);
new MCLEBFragment(*Value, true, getCurrentSectionData());
insert(new MCLEBFragment(*Value, true));
}
void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
@ -163,10 +167,20 @@ void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
report_fatal_error("This file format doesn't support weak aliases.");
}
void MCObjectStreamer::ChangeSection(const MCSection *Section) {
void MCObjectStreamer::ChangeSection(const MCSection *Section,
const MCExpr *Subsection) {
assert(Section && "Cannot switch to a null section!");
CurSectionData = &getAssembler().getOrCreateSectionData(*Section);
int64_t IntSubsection = 0;
if (Subsection &&
!Subsection->EvaluateAsAbsolute(IntSubsection, getAssembler()))
report_fatal_error("Cannot evaluate subsection number");
if (IntSubsection < 0 || IntSubsection > 8192)
report_fatal_error("Subsection number out of range");
CurInsertionPoint =
CurSectionData->getSubsectionInsertionPoint(unsigned(IntSubsection));
}
void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
@ -185,7 +199,7 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
// Now that a machine instruction has been assembled into this section, make
// a line entry for any .loc directive that has been seen.
MCLineEntry::Make(this, getCurrentSection());
MCLineEntry::Make(this, getCurrentSection().first);
// If this instruction doesn't need relaxation, just emit it as data.
MCAssembler &Assembler = getAssembler();
@ -216,8 +230,8 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
// Always create a new, separate fragment here, because its size can change
// during relaxation.
MCRelaxableFragment *IF =
new MCRelaxableFragment(Inst, getCurrentSectionData());
MCRelaxableFragment *IF = new MCRelaxableFragment(Inst);
insert(IF);
SmallString<128> Code;
raw_svector_ostream VecOS(Code);
@ -258,7 +272,7 @@ void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
return;
}
AddrDelta = ForceExpAbs(AddrDelta);
new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, getCurrentSectionData());
insert(new MCDwarfLineAddrFragment(LineDelta, *AddrDelta));
}
void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
@ -270,7 +284,7 @@ void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
return;
}
AddrDelta = ForceExpAbs(AddrDelta);
new MCDwarfCallFrameFragment(*AddrDelta, getCurrentSectionData());
insert(new MCDwarfCallFrameFragment(*AddrDelta));
}
void MCObjectStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
@ -284,8 +298,7 @@ void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
getCurrentSectionData());
insert(new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit));
// Update the maximum alignment on the current section if necessary.
if (ByteAlignment > getCurrentSectionData()->getAlignment())
@ -302,7 +315,7 @@ bool MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
int64_t Res;
if (Offset->EvaluateAsAbsolute(Res, getAssembler())) {
new MCOrgFragment(*Offset, Value, getCurrentSectionData());
insert(new MCOrgFragment(*Offset, Value));
return false;
}