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0c6ca50b9c
Commit e4507fb8c94b ("bpf: disable DwarfUsesRelocationsAcrossSections")
disables MCAsmInfo DwarfUsesRelocationsAcrossSections unconditionally
so that dwarf will not use cross section (between dwarf and symbol table)
relocations. This new debug format enables pahole to dump structures
correctly as libdwarves.so does not have BPF backend support yet.
This new debug format, however, breaks bcc (https://github.com/iovisor/bcc)
source debug output as llvm in-memory Dwarf support has some issues to
handle it. More specifically, with DwarfUsesRelocationsAcrossSections
disabled, JIT compiler does not generate .debug_abbrev and Dwarf
DIE (debug info entry) processing is not happy about this.
This patch introduces a new flag -mattr=dwarfris
(dwarf relocation in section) to disable DwarfUsesRelocationsAcrossSections.
DwarfUsesRelocationsAcrossSections is true by default.
Signed-off-by: Yonghong Song <yhs@fb.com>
llvm-svn: 326505
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
//===-- BPFMCAsmInfo.h - BPF asm properties -------------------*- C++ -*--====//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the BPFMCAsmInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_BPF_MCTARGETDESC_BPFMCASMINFO_H
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#define LLVM_LIB_TARGET_BPF_MCTARGETDESC_BPFMCASMINFO_H
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/MCAsmInfo.h"
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namespace llvm {
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class Target;
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class BPFMCAsmInfo : public MCAsmInfo {
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public:
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explicit BPFMCAsmInfo(const Triple &TT) {
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if (TT.getArch() == Triple::bpfeb)
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IsLittleEndian = false;
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PrivateGlobalPrefix = ".L";
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WeakRefDirective = "\t.weak\t";
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UsesELFSectionDirectiveForBSS = true;
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HasSingleParameterDotFile = false;
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HasDotTypeDotSizeDirective = false;
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SupportsDebugInformation = true;
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ExceptionsType = ExceptionHandling::DwarfCFI;
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MinInstAlignment = 8;
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// the default is 4 and it only affects dwarf elf output
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// so if not set correctly, the dwarf data will be
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// messed up in random places by 4 bytes. .debug_line
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// section will be parsable, but with odd offsets and
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// line numbers, etc.
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CodePointerSize = 8;
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}
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void setDwarfUsesRelocationsAcrossSections(bool enable) {
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DwarfUsesRelocationsAcrossSections = enable;
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}
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};
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}
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#endif
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