6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-05 13:26:55 +00:00
Code Issues Projects Releases Wiki Activity

llvm-mc: Support .comm emission.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80351 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2009-08-28 07:08:35 +00:00
parent d17479e845
commit 8f4d146c34
4 changed files with 191 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
lib/MC/MCAssembler.cpp
View File

@@ -25,6 +25,11 @@ class MachObjectWriter;
STATISTIC(EmittedFragments, "Number of emitted assembler fragments");
// FIXME FIXME FIXME: There are number of places in this file where we convert
// what is a 64-bit assembler value used for computation into a value in the
// object file, which may truncate it. We should detect that truncation where
// invalid and report errors back.
static void WriteFileData(raw_ostream &OS, const MCSectionData &SD,
MachObjectWriter &MOW);
@@ -328,6 +333,8 @@ public:
MCSymbolData &Data = *MSD.SymbolData;
MCSymbol &Symbol = Data.getSymbol();
uint8_t Type = 0;
uint16_t Flags = Data.getFlags();
uint32_t Address = 0;
// Set the N_TYPE bits. See <mach-o/nlist.h>.
//
@@ -348,6 +355,30 @@ public:
if (Data.isExternal() || Symbol.isUndefined())
Type |= STF_External;
// Compute the symbol address.
if (Symbol.isDefined()) {
if (Symbol.isAbsolute()) {
llvm_unreachable("FIXME: Not yet implemented!");
} else {
Address = Data.getFragment()->getAddress() + Data.getOffset();
}
} else if (Data.isCommon()) {
// Common symbols are encoded with the size in the address
// field, and their alignment in the flags.
Address = Data.getCommonSize();
// Common alignment is packed into the 'desc' bits.
if (unsigned Align = Data.getCommonAlignment()) {
unsigned Log2Size = Log2_32(Align);
assert((1U << Log2Size) == Align && "Invalid 'common' alignment!");
if (Log2Size > 15)
llvm_report_error("invalid 'common' alignment '" +
Twine(Align) + "'");
// FIXME: Keep this mask with the SymbolFlags enumeration.
Flags = (Flags & 0xF0FF) | (Log2Size << 8);
}
}
// struct nlist (12 bytes)
Write32(MSD.StringIndex);
@@ -356,17 +387,7 @@ public:
// The Mach-O streamer uses the lowest 16-bits of the flags for the 'desc'
// value.
Write16(Data.getFlags() & 0xFFFF);
// Write the symbol address.
uint32_t Address = 0;
if (Symbol.isDefined()) {
if (Symbol.isAbsolute()) {
llvm_unreachable("FIXME: Not yet implemented!");
} else {
Address = Data.getFragment()->getAddress() + Data.getOffset();
}
}
Write16(Flags);
Write32(Address);
}
@@ -910,7 +931,8 @@ MCSymbolData::MCSymbolData() : Symbol(*(MCSymbol*)0) {}
MCSymbolData::MCSymbolData(MCSymbol &_Symbol, MCFragment *_Fragment,
uint64_t _Offset, MCAssembler *A)
: Symbol(_Symbol), Fragment(_Fragment), Offset(_Offset),
IsExternal(false), IsPrivateExtern(false), Flags(0), Index(0)
IsExternal(false), IsPrivateExtern(false),
CommonSize(0), CommonAlign(0), Flags(0), Index(0)
{
if (A)
A->getSymbolList().push_back(this);

9
lib/MC/MCMachOStreamer.cpp
View File

@@ -224,7 +224,7 @@ void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
break;
case MCStreamer::Global:
getSymbolData(*Symbol).setExternal(true);
SD.setExternal(true);
break;
case MCStreamer::LazyReference:
@@ -273,7 +273,12 @@ void MCMachOStreamer::EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) {
void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
unsigned Pow2Alignment) {
llvm_unreachable("FIXME: Not yet implemented!");
// FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
MCSymbolData &SD = getSymbolData(*Symbol);
SD.setExternal(true);
SD.setCommon(Size, 1 << Pow2Alignment);
}
void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,