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Revert "[JITLink] Add anonymous symbols in LinkGraph for unnamed temporary symbols"

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This reverts commit de87238295.

Buildbot check error
This commit is contained in:
luxufan 2022-01-22 17:26:54 +08:00
parent de87238295
commit fdb6578514
5 changed files with 5 additions and 45 deletions
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8
llvm/include/llvm/ExecutionEngine/JITLink/riscv.h
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@ -79,12 +79,6 @@ enum EdgeKind_riscv : Edge::Kind {
/// Fixup <- (Target - Fixup + Addend)
R_RISCV_CALL,
/// 32 bits PC relative relocation
///
/// Fixup expression:
/// Fixup <- (Target - Fixup + Addend)
R_RISCV_32_PCREL,
/// PC relative GOT offset
///
/// Fixup expression:
@ -143,7 +137,7 @@ enum EdgeKind_riscv : Edge::Kind {
///
/// Fixup expression
/// Fixup <- (Target - *{1}Fixup - Addend)
R_RISCV_SUB8,
R_RISCV_SUB8
};
/// Returns a string name for the given riscv edge. For debugging purposes

12
llvm/lib/ExecutionEngine/JITLink/ELFLinkGraphBuilder.h
View File

@ -441,15 +441,11 @@ template <typename ELFT> Error ELFLinkGraphBuilder<ELFT>::graphifySymbols() {
<< "\"\n";
});
// In RISCV, temporary symbols (Used to generate dwarf, eh_frame
// sections...) will appear in object code's symbol table, and LLVM does
// not use names on these temporary symbols (RISCV gnu toolchain uses
// names on these temporary symbols). If the symbol is unnamed, add an
// anonymous symbol.
// Model the section symbols as anonymous symbol.
auto &GSym =
Name->empty()
? G->addAnonymousSymbol(*B, Sym.getValue(), Sym.st_size,
false, false)
Sym.getType() == ELF::STT_SECTION
? G->addAnonymousSymbol(*B, Sym.getValue(), Sym.st_size, false,
false)
: G->addDefinedSymbol(*B, Sym.getValue(), *Name, Sym.st_size, L,
S, Sym.getType() == ELF::STT_FUNC, false);
setGraphSymbol(SymIndex, GSym);

8
llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
View File

@ -359,12 +359,6 @@ private:
*FixupPtr = static_cast<uint8_t>(Value);
break;
}
case R_RISCV_32_PCREL: {
// FIXME: It seems that R_RISCV_32_PCREL relocation will only appear in debug sections
// like eh_frame section. Currently, because of eh_frame will not be processed in JITLink's RISCV
// backend, test this relocation is difficult, so here report error if needs to fixup this relocation
return make_error<JITLinkError>("Fixup of relocation type R_RISCV_32_PCREL is not supportted");
}
}
return Error::success();
}
@ -415,8 +409,6 @@ private:
return EdgeKind_riscv::R_RISCV_SUB16;
case ELF::R_RISCV_SUB8:
return EdgeKind_riscv::R_RISCV_SUB8;
case ELF::R_RISCV_32_PCREL:
return EdgeKind_riscv::R_RISCV_32_PCREL;
}
return make_error<JITLinkError>("Unsupported riscv relocation:" +

2
llvm/lib/ExecutionEngine/JITLink/riscv.cpp
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@ -38,8 +38,6 @@ const char *getEdgeKindName(Edge::Kind K) {
return "R_RISCV_PCREL_LO12_S";
case R_RISCV_CALL:
return "R_RISCV_CALL";
case R_RISCV_32_PCREL:
return "R_RISCV_32_PCREL";
case R_RISCV_ADD64:
return "R_RISCV_ADD64";
case R_RISCV_ADD32:

20
llvm/test/ExecutionEngine/JITLink/RISCV/anonymous_symbol.s
View File

@ -1,20 +0,0 @@
# RUN: llvm-mc -triple=riscv64 -filetype=obj -o %t %s
# RUN: llvm-jitlink -debug-only=jitlink -noexec %t 2>&1 | FileCheck %s
#
# Because of the exist of cfi directive, sections like eh_frame section will be emitted
# in llvm's object code emission phase. Anonymous symbols will also be emitted to indicate
# the section start and section end. So that by relocating these symbol, the section length
# can be calculated.
#
# CHECK: Creating defined graph symbol for ELF symbol ""
# CHECK: Creating defined graph symbol for ELF symbol ""
.text
.globl main
.p2align 2
.type main,@function
main:
.cfi_startproc
ret
.Lfunc_end0:
.size main, .Lfunc_end0-main
.cfi_endproc