[clang] 4f6757c - [JITLink][RISCV] Implement eh_frame handling (#68253)
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Sat Oct 28 02:30:49 PDT 2023
Author: Jonas Hahnfeld
Date: 2023-10-28T11:30:43+02:00
New Revision: 4f6757ce4bc78b7f56e4cb2a84c35444cd71c145
URL: https://github.com/llvm/llvm-project/commit/4f6757ce4bc78b7f56e4cb2a84c35444cd71c145
DIFF: https://github.com/llvm/llvm-project/commit/4f6757ce4bc78b7f56e4cb2a84c35444cd71c145.diff
LOG: [JITLink][RISCV] Implement eh_frame handling (#68253)
This requires adding a `NegDelta32` edge kind that cannot be mapped to
existing relocations.
Co-authored-by: Job Noorman <jnoorman at igalia.com>
Added:
llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.s
llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.test
Modified:
clang/test/Interpreter/simple-exception.cpp
clang/unittests/Interpreter/ExceptionTests/InterpreterExceptionTest.cpp
llvm/include/llvm/ExecutionEngine/JITLink/riscv.h
llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
llvm/lib/ExecutionEngine/JITLink/riscv.cpp
Removed:
################################################################################
diff --git a/clang/test/Interpreter/simple-exception.cpp b/clang/test/Interpreter/simple-exception.cpp
index 8741886a0a621cc..6749acd6e6bd23b 100644
--- a/clang/test/Interpreter/simple-exception.cpp
+++ b/clang/test/Interpreter/simple-exception.cpp
@@ -1,7 +1,7 @@
// clang-format off
// UNSUPPORTED: system-aix
-// XFAIL for arm, arm64, riscv, or running on Windows.
-// XFAIL: target={{(arm|riscv).*}}, system-windows
+// XFAIL for arm and arm64, or running on Windows.
+// XFAIL: target=arm{{.*}}, system-windows
// RUN: cat %s | clang-repl | FileCheck %s
// Incompatible with msan. It passes with -O3 but fail -Oz. Interpreter
diff --git a/clang/unittests/Interpreter/ExceptionTests/InterpreterExceptionTest.cpp b/clang/unittests/Interpreter/ExceptionTests/InterpreterExceptionTest.cpp
index 7b47d93446192ba..2f1c4efb381f00b 100644
--- a/clang/unittests/Interpreter/ExceptionTests/InterpreterExceptionTest.cpp
+++ b/clang/unittests/Interpreter/ExceptionTests/InterpreterExceptionTest.cpp
@@ -122,11 +122,6 @@ extern "C" int throw_exception() {
Triple.getArch() == llvm::Triple::aarch64_32))
GTEST_SKIP();
- // FIXME: RISC-V fails as .eh_frame handling is not yet implemented in
- // JITLink for RISC-V. See PR #66067.
- if (Triple.isRISCV())
- GTEST_SKIP();
-
llvm::cantFail(Interp->ParseAndExecute(ExceptionCode));
testing::internal::CaptureStdout();
auto ThrowException =
diff --git a/llvm/include/llvm/ExecutionEngine/JITLink/riscv.h b/llvm/include/llvm/ExecutionEngine/JITLink/riscv.h
index cb66289180880ce..a31f7d73b099f45 100644
--- a/llvm/include/llvm/ExecutionEngine/JITLink/riscv.h
+++ b/llvm/include/llvm/ExecutionEngine/JITLink/riscv.h
@@ -214,6 +214,12 @@ enum EdgeKind_riscv : Edge::Kind {
/// Linker relaxation will use this to ensure all code sequences are properly
/// aligned and then remove these edges from the graph.
AlignRelaxable,
+
+ /// 32-bit negative delta.
+ ///
+ /// Fixup expression:
+ /// Fixup <- Fixup - Target + Addend
+ NegDelta32,
};
/// Returns a string name for the given riscv edge. For debugging purposes
diff --git a/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp b/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
index 35816ea66cf9bc3..d0701ba08bd9194 100644
--- a/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
+++ b/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
@@ -11,10 +11,12 @@
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/JITLink/ELF_riscv.h"
+#include "EHFrameSupportImpl.h"
#include "ELFLinkGraphBuilder.h"
#include "JITLinkGeneric.h"
#include "PerGraphGOTAndPLTStubsBuilder.h"
#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/ExecutionEngine/JITLink/DWARFRecordSectionSplitter.h"
#include "llvm/ExecutionEngine/JITLink/JITLink.h"
#include "llvm/ExecutionEngine/JITLink/riscv.h"
#include "llvm/Object/ELF.h"
@@ -456,6 +458,13 @@ class ELFJITLinker_riscv : public JITLinker<ELFJITLinker_riscv> {
case AlignRelaxable:
// Ignore when the relaxation pass did not run
break;
+ case NegDelta32: {
+ int64_t Value = FixupAddress - E.getTarget().getAddress() + E.getAddend();
+ if (LLVM_UNLIKELY(!isInRangeForImm(Value, 32)))
+ return makeTargetOutOfRangeError(G, B, E);
+ *(little32_t *)FixupPtr = static_cast<uint32_t>(Value);
+ break;
+ }
}
return Error::success();
}
@@ -958,6 +967,13 @@ void link_ELF_riscv(std::unique_ptr<LinkGraph> G,
PassConfiguration Config;
const Triple &TT = G->getTargetTriple();
if (Ctx->shouldAddDefaultTargetPasses(TT)) {
+
+ Config.PrePrunePasses.push_back(DWARFRecordSectionSplitter(".eh_frame"));
+ Config.PrePrunePasses.push_back(EHFrameEdgeFixer(
+ ".eh_frame", G->getPointerSize(), Edge::Invalid, Edge::Invalid,
+ Edge::Invalid, Edge::Invalid, NegDelta32));
+ Config.PrePrunePasses.push_back(EHFrameNullTerminator(".eh_frame"));
+
if (auto MarkLive = Ctx->getMarkLivePass(TT))
Config.PrePrunePasses.push_back(std::move(MarkLive));
else
diff --git a/llvm/lib/ExecutionEngine/JITLink/riscv.cpp b/llvm/lib/ExecutionEngine/JITLink/riscv.cpp
index a78843b1614795e..a4e4daef97fb5d6 100644
--- a/llvm/lib/ExecutionEngine/JITLink/riscv.cpp
+++ b/llvm/lib/ExecutionEngine/JITLink/riscv.cpp
@@ -82,6 +82,8 @@ const char *getEdgeKindName(Edge::Kind K) {
return "CallRelaxable";
case AlignRelaxable:
return "AlignRelaxable";
+ case NegDelta32:
+ return "NegDelta32";
}
return getGenericEdgeKindName(K);
}
diff --git a/llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.s b/llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.s
new file mode 100644
index 000000000000000..9173bf7c3d95e4a
--- /dev/null
+++ b/llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.s
@@ -0,0 +1,74 @@
+# REQUIRES: asserts
+
+# RUN: llvm-mc -triple=riscv32-linux-gnu -mattr=+relax -filetype=obj -o %t.32.o %s
+# RUN: llvm-jitlink -noexec -phony-externals -debug-only=jitlink %t.32.o 2>&1 | \
+# RUN: FileCheck %s
+
+# RUN: llvm-mc -triple=riscv64-linux-gnu -mattr=+relax -filetype=obj -o %t.64.o %s
+# RUN: llvm-jitlink -noexec -phony-externals -debug-only=jitlink %t.64.o 2>&1 | \
+# RUN: FileCheck %s
+
+# Check that splitting of eh-frame sections works.
+#
+# CHECK: DWARFRecordSectionSplitter: Processing .eh_frame...
+# CHECK: Processing block at
+# CHECK: Processing CFI record at
+# CHECK: Extracted {{.*}} section = .eh_frame
+# CHECK: Processing CFI record at
+# CHECK: Extracted {{.*}} section = .eh_frame
+# CHECK: EHFrameEdgeFixer: Processing .eh_frame in "{{.*}}"...
+# CHECK: Processing block at
+# CHECK: Record is CIE
+# CHECK: Processing block at
+# CHECK: Record is FDE
+# CHECK: Adding edge at {{.*}} to CIE at: {{.*}}
+# CHECK: Existing edge at {{.*}} to PC begin at {{.*}}
+# CHECK: Adding keep-alive edge from target at {{.*}} to FDE at {{.*}}
+# CHECK: Processing block at
+# CHECK: Record is FDE
+# CHECK: Adding edge at {{.*}} to CIE at: {{.*}}
+# CHECK: Existing edge at {{.*}} to PC begin at {{.*}}
+# CHECK: Adding keep-alive edge from target at {{.*}} to FDE at {{.*}}
+
+## This is "int main { throw 1; }" compiled for riscv32. We use the 32-bit
+## version because it is also legal for riscv64.
+ .text
+ .globl main
+ .p2align 1
+ .type main, at function
+main:
+ .cfi_startproc
+ addi sp, sp, -16
+ .cfi_def_cfa_offset 16
+ sw ra, 12(sp)
+ .cfi_offset ra, -4
+ li a0, 4
+ call __cxa_allocate_exception
+ li a1, 1
+ sw a1, 0(a0)
+ lga a1, _ZTIi
+ li a2, 0
+ call __cxa_throw
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+
+ .globl dup
+ .p2align 1
+ .type dup, at function
+dup:
+ .cfi_startproc
+ addi sp, sp, -16
+ .cfi_def_cfa_offset 16
+ sw ra, 12(sp)
+ .cfi_offset ra, -4
+ li a0, 4
+ call __cxa_allocate_exception
+ li a1, 1
+ sw a1, 0(a0)
+ lga a1, _ZTIi
+ li a2, 0
+ call __cxa_throw
+.Lfunc_end1:
+ .size dup, .Lfunc_end1-dup
+ .cfi_endproc
diff --git a/llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.test b/llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.test
new file mode 100644
index 000000000000000..95666d2e232b70d
--- /dev/null
+++ b/llvm/test/ExecutionEngine/JITLink/RISCV/ELF_ehframe.test
@@ -0,0 +1,104 @@
+# RUN: yaml2obj -DELFCLASS=ELFCLASS32 -o %t.32.o %s
+# RUN: llvm-jitlink -noexec -check %s %t.32.o
+# RUN: yaml2obj -DELFCLASS=ELFCLASS64 -o %t.64.o %s
+# RUN: llvm-jitlink -noexec -check %s %t.64.o
+
+### Compiled from the following code with -mattr=+relax to force relocations for
+### address_range and DW_CFA_advance_loc (both needed for .balign).
+## .text
+## .globl main
+## .p2align 1
+## .type main, at function
+## main:
+## .cfi_startproc
+## .balign 8
+## addi sp, sp, -16
+## cfa_advance_loc:
+## .cfi_def_cfa_offset 16
+## nop
+## main_end:
+## .size main, main_end-main
+## .cfi_endproc
+
+--- !ELF
+FileHeader:
+ Class: [[ELFCLASS]]
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_RISCV
+ SectionHeaderStringTable: .strtab
+Sections:
+ - Name: .text
+ Type: SHT_PROGBITS
+ Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
+ AddressAlign: 0x8
+ Content: 13000000130101FF13000000
+ - Name: .eh_frame
+ Type: SHT_PROGBITS
+ Flags: [ SHF_ALLOC ]
+ AddressAlign: 0x8
+ Content: 1000000000000000017A5200017801011B0C02001000000018000000000000000000000000400E10
+ - Name: .rela.text
+ Type: SHT_RELA
+ Flags: [ SHF_INFO_LINK ]
+ Link: .symtab
+ AddressAlign: 0x8
+ Info: .text
+ Relocations:
+ - Type: R_RISCV_ALIGN
+ Addend: 4
+ - Name: .rela.eh_frame
+ Type: SHT_RELA
+ Flags: [ SHF_INFO_LINK ]
+ Link: .symtab
+ AddressAlign: 0x8
+ Info: .eh_frame
+ Relocations:
+ - Offset: 0x1C
+ Symbol: main
+ Type: R_RISCV_32_PCREL
+ - Offset: 0x20
+ Symbol: main_end
+ Type: R_RISCV_ADD32
+ - Offset: 0x20
+ Symbol: main
+ Type: R_RISCV_SUB32
+ - Offset: 0x25
+ Symbol: cfa_advance_loc
+ Type: R_RISCV_SET6
+ - Offset: 0x25
+ Symbol: main
+ Type: R_RISCV_SUB6
+ - Type: SectionHeaderTable
+ Sections:
+ - Name: .strtab
+ - Name: .text
+ - Name: .rela.text
+ - Name: .eh_frame
+ - Name: .rela.eh_frame
+ - Name: .symtab
+Symbols:
+ - Name: cfa_advance_loc
+ Section: .text
+ Value: 0x8
+ - Name: main_end
+ Section: .text
+ Value: 0xC
+ - Name: main
+ Type: STT_FUNC
+ Section: .text
+ Binding: STB_GLOBAL
+ Size: 0xC
+ - Name: eh_frame
+ Type: STT_SECTION
+ Binding: STB_GLOBAL
+ Section: .eh_frame
+ Size: 0x28
+...
+
+## CIE_pointer
+# jitlink-check: *{4}(eh_frame + 0x1c) = main - (eh_frame + 0x1c)
+## address_range
+# jitlink-check: *{4}(eh_frame + 0x20) = main_end - main
+## DW_CFA_advance_loc
+# jitlink-check: (*{1}(eh_frame + 0x25)) & 0x3f = cfa_advance_loc - main
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