[lld] Fix -ObjC load behavior with LTO for section names with whitespace #146654
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This is a fix additional to llvm#92162 In some cases, section names contain a whitespace between the segment name and the actual section name (e.g. `__TEXT, __swift5_proto`). It is confirmed by source code of the Swift compiler This fix allows LTO to work correctly with the `-ObjC` flag in that rare case when only a section with a whitespace in the name is present in the linked bitcode module, but there are no sections containing `__TEXT,__swift`
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@llvm/pr-subscribers-lld-macho @llvm/pr-subscribers-lld Author: None (aleksandr-urakov) ChangesThis is a fix additional to #92162 In some cases, section names contain a whitespace between the segment name and the actual section name (e.g. This fix allows LTO to work correctly with the Full diff: https://github.com/llvm/llvm-project/pull/146654.diff 2 Files Affected:
diff --git a/lld/test/MachO/objc.s b/lld/test/MachO/objc.s
index dbb9f1df27571..c327b206290ab 100644
--- a/lld/test/MachO/objc.s
+++ b/lld/test/MachO/objc.s
@@ -7,12 +7,13 @@
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/has-swift.s -o %t/has-swift.o
# RUN: llvm-as %t/has-swift-ir-loaded.ll -o %t/has-swift-ir-loaded.o
# RUN: llvm-as %t/has-swift-ir-not-loaded.ll -o %t/has-swift-ir-not-loaded.o
+# RUN: llvm-as %t/has-swift-with-space-ir-loaded.ll -o %t/has-swift-with-space-ir-loaded.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/has-swift-proto.s -o %t/has-swift-proto.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/no-objc.s -o %t/no-objc.o
## Make sure we don't mis-parse a 32-bit file as 64-bit
# RUN: llvm-mc -filetype=obj -triple=armv7-apple-watchos %t/no-objc.s -o %t/wrong-arch.o
-# RUN: llvm-ar rcs %t/libHasSomeObjC.a %t/no-objc.o %t/has-objc-symbol.o %t/has-objc-category.o %t/has-swift.o %t/has-swift-proto.o %t/has-swift-ir-loaded.o %t/has-swift-ir-not-loaded.o %t/wrong-arch.o
-# RUN: llvm-ar rcs %t/libHasSomeObjC2.a %t/no-objc.o %t/has-objc-symbol-and-category.o %t/has-swift.o %t/has-swift-proto.o %t/has-swift-ir-loaded.o %t/has-swift-ir-not-loaded.o %t/wrong-arch.o
+# RUN: llvm-ar rcs %t/libHasSomeObjC.a %t/no-objc.o %t/has-objc-symbol.o %t/has-objc-category.o %t/has-swift.o %t/has-swift-proto.o %t/has-swift-ir-loaded.o %t/has-swift-ir-not-loaded.o %t/has-swift-with-space-ir-loaded.o %t/wrong-arch.o
+# RUN: llvm-ar rcs %t/libHasSomeObjC2.a %t/no-objc.o %t/has-objc-symbol-and-category.o %t/has-swift.o %t/has-swift-proto.o %t/has-swift-ir-loaded.o %t/has-swift-ir-not-loaded.o %t/has-swift-with-space-ir-loaded.o %t/wrong-arch.o
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/test.s -o %t/test.o
@@ -22,7 +23,7 @@
# RUN: %lld -lSystem %t/test.o -o %t/test -L%t -lHasSomeObjC2 -ObjC
# RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s --check-prefix=OBJC
-# RUN: %no-fatal-warnings-lld -lSystem %t/test.o -o %t/test --start-lib %t/no-objc.o %t/has-objc-symbol.o %t/has-objc-category.o %t/has-swift.o %t/has-swift-proto.o %t/has-swift-ir-loaded.o %t/has-swift-ir-not-loaded.o %t/wrong-arch.o --end-lib -ObjC 2>&1 \
+# RUN: %no-fatal-warnings-lld -lSystem %t/test.o -o %t/test --start-lib %t/no-objc.o %t/has-objc-symbol.o %t/has-objc-category.o %t/has-swift.o %t/has-swift-proto.o %t/has-swift-ir-loaded.o %t/has-swift-ir-not-loaded.o %t/has-swift-with-space-ir-loaded.o %t/wrong-arch.o --end-lib -ObjC 2>&1 \
# RUN: | FileCheck -check-prefix=WARNING %s
# RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s --check-prefix=OBJC
@@ -34,14 +35,16 @@
# OBJC-NEXT: 0 __text {{.*}} TEXT
# OBJC-NEXT: 1 __swift {{.*}} DATA
# OBJC-NEXT: 2 __swift5_fieldmd{{.*}} DATA
-# OBJC-NEXT: 3 __objc_catlist {{.*}} DATA
-# OBJC-NEXT: 4 has_objc_symbol {{.*}} DATA
+# OBJC-NEXT: 3 __swift5_proto {{.*}} DATA
+# OBJC-NEXT: 4 __objc_catlist {{.*}} DATA
+# OBJC-NEXT: 5 has_objc_symbol {{.*}} DATA
# OBJC-EMPTY:
# OBJC-NEXT: SYMBOL TABLE:
# OBJC-DAG: g O __TEXT,__swift _foo
# OBJC-DAG: g F __TEXT,__text _main
# OBJC-DAG: g F __TEXT,__text _OBJC_CLASS_$_MyObject
# OBJC-DAG: g O __TEXT,__swift5_fieldmd $s7somelib4Blah_pMF
+# OBJC-DAG: g O __TEXT,__swift5_proto _baz
# RUN: %lld -lSystem %t/test.o -o %t/test -L%t -lHasSomeObjC
# RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s --check-prefix=NO-OBJC
@@ -117,6 +120,13 @@ target triple = "x86_64-apple-darwin"
@bar = global i64 1234
@llvm.used = appending global [1 x ptr] [ptr @bar]
+#--- has-swift-with-space-ir-loaded.ll
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+target triple = "x86_64-apple-darwin"
+
+@baz = global i64 1234, section "__TEXT, __swift5_proto"
+@llvm.used = appending global [1 x ptr] [ptr @baz]
+
#--- has-swift-proto.s
.section __TEXT,__swift5_fieldmd
.globl $s7somelib4Blah_pMF
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index de7bf9b7f4d79..7cc5fb39b4169 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -296,7 +296,8 @@ static Expected<bool> hasObjCCategoryInModule(BitstreamCursor &Stream) {
// Check for the i386 and other (x86_64, ARM) conventions
if (S.find("__DATA,__objc_catlist") != std::string::npos ||
S.find("__OBJC,__category") != std::string::npos ||
- S.find("__TEXT,__swift") != std::string::npos)
+ S.find("__TEXT,__swift") != std::string::npos ||
+ S.find("__TEXT, __swift") != std::string::npos)
return true;
break;
}
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Hi guys! Gentle ping |
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This is a fix additional to #92162
In some cases, section names contain a whitespace between the segment name and the actual section name (e.g.
__TEXT, __swift5_proto). It is confirmed by source code of the Swift compilerThis fix allows LTO to work correctly with the
-ObjCflag in that rare case when only a section with a whitespace in the name is present in the linked bitcode module, but there are no sections containing__TEXT,__swift