https://github.com/yingcong-wu updated
https://github.com/llvm/llvm-project/pull/154902
>From 57ebc553828bf696b4bde30789e609ba96e94d6d Mon Sep 17 00:00:00 2001
From: Wu Yingcong <yingcong...@intel.com>
Date: Fri, 22 Aug 2025 15:16:47 +0800
Subject: [PATCH 1/4] fix missing by one bug
---
libunwind/src/DwarfParser.hpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libunwind/src/DwarfParser.hpp b/libunwind/src/DwarfParser.hpp
index 7e85025dd054d..25250e0810987 100644
--- a/libunwind/src/DwarfParser.hpp
+++ b/libunwind/src/DwarfParser.hpp
@@ -273,7 +273,7 @@ bool CFI_Parser<A>::findFDE(A &addressSpace, pint_t pc,
pint_t ehSectionStart,
pint_t pcRange = addressSpace.getEncodedP(
p, nextCFI, cieInfo->pointerEncoding & 0x0F);
// Test if pc is within the function this FDE covers.
- if ((pcStart < pc) && (pc <= pcStart + pcRange)) {
+ if ((pcStart <= pc) && (pc < pcStart + pcRange)) {
// parse rest of info
fdeInfo->lsda = 0;
// check for augmentation length
>From 3b1e1f76fc66fbcc549280fd9a60eeeb6eab52ca Mon Sep 17 00:00:00 2001
From: Wu Yingcong <yingcong...@intel.com>
Date: Mon, 25 Aug 2025 09:52:18 +0800
Subject: [PATCH 2/4] empty commit
trigger ci
>From fbf9b3f03b1d2ee0bad1df58ca05be50139da378 Mon Sep 17 00:00:00 2001
From: "Wu, Yingcong" <yingcong...@intel.com>
Date: Thu, 28 Aug 2025 14:11:12 +0800
Subject: [PATCH 3/4] add test
---
libunwind/test/eh_frame_fde_pc_range.pass.cpp | 47 +++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 libunwind/test/eh_frame_fde_pc_range.pass.cpp
diff --git a/libunwind/test/eh_frame_fde_pc_range.pass.cpp
b/libunwind/test/eh_frame_fde_pc_range.pass.cpp
new file mode 100644
index 0000000000000..b77287cc3c243
--- /dev/null
+++ b/libunwind/test/eh_frame_fde_pc_range.pass.cpp
@@ -0,0 +1,47 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Manually marking the .eh_frame_hdr as DW_EH_PE_omit to make libunwind to do
+// the linear search.
+
+// clang-format off
+// REQUIRES: target={{x86_64-.+-linux-gnu}}
+// RUN: %{build}
+// RUN: objcopy --dump-section .eh_frame_hdr=%t_ehf_hdr.bin %t.exe
+// RUN: echo -ne '\xFF' | dd of=%t_ehf_hdr.bin bs=1 seek=2 count=2
conv=notrunc status=none
+// RUN: objcopy --update-section .eh_frame_hdr=%t_ehf_hdr.bin %t.exe
+// RUN: %{exec} %t.exe
+// clang-format on
+
+#include <assert.h>
+#include <libunwind.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unwind.h>
+
+void f() {
+ printf("123\n");
+ void *pc = __builtin_return_address(0);
+ void *fpc = (void *)&f;
+ void *fpc1 = (void *)((uintptr_t)fpc + 1);
+
+ struct dwarf_eh_bases bases;
+ const void *fde_pc = _Unwind_Find_FDE(pc, &bases);
+ const void *fde_fpc = _Unwind_Find_FDE(fpc, &bases);
+ const void *fde_fpc1 = _Unwind_Find_FDE(fpc1, &bases);
+ assert(fde_pc != NULL);
+ assert(fde_fpc != NULL);
+ assert(fde_fpc1 != NULL);
+ assert(fde_fpc == fde_fpc1);
+}
+
+int main() {
+ f();
+ return 0;
+}
>From ad2f48124deadea8f271fd58aa5286da0966d7fb Mon Sep 17 00:00:00 2001
From: "Wu, Yingcong" <yingcong...@intel.com>
Date: Thu, 28 Aug 2025 14:21:41 +0800
Subject: [PATCH 4/4] update test
---
libunwind/test/eh_frame_fde_pc_range.pass.cpp | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libunwind/test/eh_frame_fde_pc_range.pass.cpp
b/libunwind/test/eh_frame_fde_pc_range.pass.cpp
index b77287cc3c243..01d73bff6ffb7 100644
--- a/libunwind/test/eh_frame_fde_pc_range.pass.cpp
+++ b/libunwind/test/eh_frame_fde_pc_range.pass.cpp
@@ -9,6 +9,7 @@
// Manually marking the .eh_frame_hdr as DW_EH_PE_omit to make libunwind to do
// the linear search.
+// Assuming the begining of the function is at the start of the FDE range.
// clang-format off
// REQUIRES: target={{x86_64-.+-linux-gnu}}
@@ -35,6 +36,9 @@ void f() {
const void *fde_pc = _Unwind_Find_FDE(pc, &bases);
const void *fde_fpc = _Unwind_Find_FDE(fpc, &bases);
const void *fde_fpc1 = _Unwind_Find_FDE(fpc1, &bases);
+ printf("fde_pc = %p\n", fde_pc);
+ printf("fde_fpc = %p\n", fde_fpc);
+ printf("fde_fpc1 = %p\n", fde_fpc1);
assert(fde_pc != NULL);
assert(fde_fpc != NULL);
assert(fde_fpc1 != NULL);
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