6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-23 17:24:48 +00:00
Code Issues Projects Releases Wiki Activity

DebugInfo: PR14728: TLS support

Browse Source 
Based on GCC's output for TLS variables (OP_constNu, x@dtpoff,
OP_lo_user), this implements debug info support for TLS in ELF. Verified
that this output is correct/sufficient on Linux (using gold - if you're
using binutils-ld, you'll need something with the fix for
http://sourceware.org/bugzilla/show_bug.cgi?id=15685 in it).

Support on non-ELF is sort of "arbitrary" at the moment - if Apple folks
want to discuss (or just go ahead & implement) how this should work in
MachO, etc, I'm open.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185203 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2013-06-28 20:05:11 +00:00
parent 95e72c90e4
commit 59eaa38746
6 changed files with 69 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
View File

@ -27,6 +27,7 @@
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
@ -1351,7 +1352,23 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
if (isGlobalVariable) {
addToAccelTable = true;
DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
addOpAddress(Block, Asm->Mang->getSymbol(GV.getGlobal()));
const MCSymbol *Sym = Asm->Mang->getSymbol(GV.getGlobal());
if (GV.getGlobal()->isThreadLocal()) {
// FIXME: Make this work with -gsplit-dwarf.
unsigned PointerSize = Asm->getDataLayout().getPointerSize();
assert((PointerSize == 4 || PointerSize == 8) &&
"Add support for other sizes if necessary");
// Based on GCC's support for TLS:
// 1) Start with a constNu of the appropriate pointer size
addUInt(Block, 0, dwarf::DW_FORM_data1,
PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
// 2) containing the (relocated) address of the TLS variable
addLabel(Block, 0, dwarf::DW_FORM_udata,
Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym));
// 3) followed by a custom OP to tell the debugger about TLS (presumably)
addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_lo_user);
} else
addOpAddress(Block, Sym);
// Do not create specification DIE if context is either compile unit
// or a subprogram.
if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
@ -1413,8 +1430,6 @@ void CompileUnit::createGlobalVariableDIE(const MDNode *N) {
if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
addAccelName(GV.getLinkageName(), AddrDIE);
}
return;
}
/// constructSubrangeDIE - Construct subrange DIE from DISubrange.