03e1c8b8f9
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
57 lines
1.6 KiB
TableGen
57 lines
1.6 KiB
TableGen
//===-- BPF.td - Describe the BPF Target Machine -----------*- tablegen -*-===//
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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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include "llvm/Target/Target.td"
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include "BPFRegisterInfo.td"
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include "BPFCallingConv.td"
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include "BPFInstrInfo.td"
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def BPFInstrInfo : InstrInfo;
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class Proc<string Name, list<SubtargetFeature> Features>
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: Processor<Name, NoItineraries, Features>;
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def : Proc<"generic", []>;
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def : Proc<"v1", []>;
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def : Proc<"v2", []>;
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def : Proc<"probe", []>;
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def DummyFeature : SubtargetFeature<"dummy", "isDummyMode",
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"true", "unused feature">;
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def ALU32 : SubtargetFeature<"alu32", "HasAlu32", "true",
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"Enable ALU32 instructions">;
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def DwarfRIS: SubtargetFeature<"dwarfris", "UseDwarfRIS", "true",
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"Disable MCAsmInfo DwarfUsesRelocationsAcrossSections">;
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def BPFInstPrinter : AsmWriter {
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string AsmWriterClassName = "InstPrinter";
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bit isMCAsmWriter = 1;
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}
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def BPFAsmParser : AsmParser {
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bit HasMnemonicFirst = 0;
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}
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def BPFAsmParserVariant : AsmParserVariant {
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int Variant = 0;
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string Name = "BPF";
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string BreakCharacters = ".";
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string TokenizingCharacters = "#()[]=:.<>!+*";
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}
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def BPF : Target {
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let InstructionSet = BPFInstrInfo;
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let AssemblyWriters = [BPFInstPrinter];
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let AssemblyParsers = [BPFAsmParser];
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let AssemblyParserVariants = [BPFAsmParserVariant];
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}
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