mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-30 02:32:08 +00:00
d751c64a67
information is in an unreachable block, then it's possible that the high/low pc
values won't be set for the dwarf information. E.g., this function:
void abort(void) __attribute__((__noreturn__));
void dead_beef(void) __attribute__ ((noreturn));
int *b;
void dead_beef(void) {
*b=0xdeadbeef;
abort();
}
has a call to "@llvm.dbg.region.end" only in the unreachable block:
define void @dead_beef() noreturn nounwind {
entry:
call void @llvm.dbg.func.start(...)
call void @llvm.dbg.stoppoint(...)
...
call void @abort( ) noreturn nounwind
unreachable
return: ; No predecessors!
call void @llvm.dbg.stoppoint(...)
call void @llvm.dbg.region.end(...)
ret void
}
The dwarf information emitted is something like:
0x00000084: TAG_subprogram [5]
AT_name( "dead_beef" )
AT_external( 0x01 )
AT_prototyped( 0x01 )
AT_decl_file( 0x01 )
AT_decl_line( 0x08 )
Note that this is *not* the best fix for this problem, but a band-aid for an
gaping wound. This code needs to be changed when we revamp our debugging
information.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56628 91177308-0d34-0410-b5e6-96231b3b80d8
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
//===-- llvm/CodeGen/DwarfWriter.h - Dwarf Framework ------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains support for writing Dwarf debug and exception info into
|
|
// asm files. For Details on the Dwarf 3 specfication see DWARF Debugging
|
|
// Information Format V.3 reference manual http://dwarf.freestandards.org ,
|
|
//
|
|
// The role of the Dwarf Writer class is to extract information from the
|
|
// MachineModuleInfo object, organize it in Dwarf form and then emit it into asm
|
|
// the current asm file using data and high level Dwarf directives.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_DWARFWRITER_H
|
|
#define LLVM_CODEGEN_DWARFWRITER_H
|
|
|
|
#include <iosfwd>
|
|
|
|
namespace llvm {
|
|
|
|
class AsmPrinter;
|
|
class DwarfDebug;
|
|
class DwarfException;
|
|
class MachineModuleInfo;
|
|
class MachineFunction;
|
|
class Module;
|
|
class TargetAsmInfo;
|
|
class raw_ostream;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DwarfWriter - Emits Dwarf debug and exception handling directives.
|
|
//
|
|
|
|
class DwarfWriter {
|
|
private:
|
|
/// DD - Provides the DwarfWriter debug implementation.
|
|
///
|
|
DwarfDebug *DD;
|
|
|
|
/// DE - Provides the DwarfWriter exception implementation.
|
|
///
|
|
DwarfException *DE;
|
|
|
|
public:
|
|
|
|
DwarfWriter(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T);
|
|
virtual ~DwarfWriter();
|
|
|
|
/// SetModuleInfo - Set machine module info when it's known that pass manager
|
|
/// has created it. Set by the target AsmPrinter.
|
|
void SetModuleInfo(MachineModuleInfo *MMI);
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Main entry points.
|
|
//
|
|
|
|
/// BeginModule - Emit all Dwarf sections that should come prior to the
|
|
/// content.
|
|
void BeginModule(Module *M);
|
|
|
|
/// EndModule - Emit all Dwarf sections that should come after the content.
|
|
///
|
|
void EndModule();
|
|
|
|
/// BeginFunction - Gather pre-function debug information. Assumes being
|
|
/// emitted immediately after the function entry point.
|
|
void BeginFunction(MachineFunction *MF);
|
|
|
|
/// EndFunction - Gather and emit post-function debug information.
|
|
///
|
|
void EndFunction(MachineFunction *MF);
|
|
};
|
|
|
|
|
|
} // end llvm namespace
|
|
|
|
#endif
|