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Fix conflict value for metadata "Objective-C Garbage Collection" in the mix of swift and Objective-C bitcode

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Summary:
The change is to fix conflict value for metadata "Objective-C Garbage Collection" in the mix of swift and Objective-C bitcode.
The purpose is to provide the support of LTO for swift and Objective-C mixed project.

Reviewers: rjmccall, ahatanak, steven_wu

Reviewed By: rjmccall, steven_wu

Subscribers: manmanren, mehdi_amini, hiraditya, dexonsmith, llvm-commits, jinlin

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D71219
This commit is contained in:
Jin Lin 2020-03-10 12:46:40 -07:00
parent d2f3e5f204
commit a0cacb6054
9 changed files with 223 additions and 6 deletions
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11
clang/lib/CodeGen/CGObjCMac.cpp
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@ -5159,15 +5159,18 @@ void CGObjCCommonMac::EmitImageInfo() {
Mod.addModuleFlag(llvm::Module::Error, "Objective-C Image Info Section",
llvm::MDString::get(VMContext, Section));
auto Int8Ty = llvm::Type::getInt8Ty(VMContext);
if (CGM.getLangOpts().getGC() == LangOptions::NonGC) {
// Non-GC overrides those files which specify GC.
Mod.addModuleFlag(llvm::Module::Override,
"Objective-C Garbage Collection", (uint32_t)0);
Mod.addModuleFlag(llvm::Module::Error,
"Objective-C Garbage Collection",
llvm::ConstantInt::get(Int8Ty,0));
} else {
// Add the ObjC garbage collection value.
Mod.addModuleFlag(llvm::Module::Error,
"Objective-C Garbage Collection",
eImageInfo_GarbageCollected);
llvm::ConstantInt::get(Int8Ty,
(uint8_t)eImageInfo_GarbageCollected));
if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
// Add the ObjC GC Only value.
@ -5178,7 +5181,7 @@ void CGObjCCommonMac::EmitImageInfo() {
llvm::Metadata *Ops[2] = {
llvm::MDString::get(VMContext, "Objective-C Garbage Collection"),
llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
llvm::Type::getInt32Ty(VMContext), eImageInfo_GarbageCollected))};
Int8Ty, eImageInfo_GarbageCollected))};
Mod.addModuleFlag(llvm::Module::Require, "Objective-C GC Only",
llvm::MDNode::get(VMContext, Ops));
}

4
clang/test/CodeGenObjC/image-info.m
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@ -8,10 +8,10 @@
// CHECK-FRAGILE: !{{[0-9]+}} = !{i32 1, !"Objective-C Version", i32 1}
// CHECK-FRAGILE-NEXT: !{{[0-9]+}} = !{i32 1, !"Objective-C Image Info Version", i32 0}
// CHECK-FRAGILE-NEXT: !{{[0-9]+}} = !{i32 1, !"Objective-C Image Info Section", !"__OBJC,__image_info,regular"}
// CHECK-FRAGILE-NEXT: !{{[0-9]+}} = !{i32 4, !"Objective-C Garbage Collection", i32 0}
// CHECK-FRAGILE-NEXT: !{{[0-9]+}} = !{i32 1, !"Objective-C Garbage Collection", i8 0}
// CHECK-NONFRAGILE: !llvm.module.flags = !{{{.*}}}
// CHECK-NONFRAGILE: !{{[0-9]+}} = !{i32 1, !"Objective-C Version", i32 2}
// CHECK-NONFRAGILE-NEXT: !{{[0-9]+}} = !{i32 1, !"Objective-C Image Info Version", i32 0}
// CHECK-NONFRAGILE-NEXT: !{{[0-9]+}} = !{i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
// CHECK-NONFRAGILE-NEXT: !{{[0-9]+}} = !{i32 4, !"Objective-C Garbage Collection", i32 0}
// CHECK-NONFRAGILE-NEXT: !{{[0-9]+}} = !{i32 1, !"Objective-C Garbage Collection", i8 0}

9
llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@ -84,6 +84,15 @@ static void GetObjCImageInfo(Module &M, unsigned &Version, unsigned &Flags,
} else if (Key == "Objective-C Image Info Section") {
Section = cast<MDString>(MFE.Val)->getString();
}
// Backend generates L_OBJC_IMAGE_INFO from Swift ABI version + major + minor +
// "Objective-C Garbage Collection".
else if (Key == "Swift ABI Version") {
Flags |= (mdconst::extract<ConstantInt>(MFE.Val)->getZExtValue()) << 8;
} else if (Key == "Swift Major Version") {
Flags |= (mdconst::extract<ConstantInt>(MFE.Val)->getZExtValue()) << 24;
} else if (Key == "Swift Minor Version") {
Flags |= (mdconst::extract<ConstantInt>(MFE.Val)->getZExtValue()) << 16;
}
}
}

41
llvm/lib/IR/AutoUpgrade.cpp
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@ -4022,6 +4022,12 @@ bool llvm::UpgradeModuleFlags(Module &M) {
return false;
bool HasObjCFlag = false, HasClassProperties = false, Changed = false;
bool HasSwiftVersionFlag = false;
uint8_t SwiftMajorVersion, SwiftMinorVersion;
uint32_t SwiftABIVersion;
auto Int8Ty = Type::getInt8Ty(M.getContext());
auto Int32Ty = Type::getInt32Ty(M.getContext());
for (unsigned I = 0, E = ModFlags->getNumOperands(); I != E; ++I) {
MDNode *Op = ModFlags->getOperand(I);
if (Op->getNumOperands() != 3)
@ -4067,6 +4073,31 @@ bool llvm::UpgradeModuleFlags(Module &M) {
}
}
}
// IRUpgrader turns a i32 type "Objective-C Garbage Collection" into i8 value.
// If the higher bits are set, it adds new module flag for swift info.
if (ID->getString() == "Objective-C Garbage Collection") {
auto Md = dyn_cast<ConstantAsMetadata>(Op->getOperand(2));
if (Md) {
assert(Md->getValue() && "Expected non-empty metadata");
auto Type = Md->getValue()->getType();
if (Type == Int8Ty)
continue;
unsigned Val = Md->getValue()->getUniqueInteger().getZExtValue();
if ((Val & 0xff) != Val) {
HasSwiftVersionFlag = true;
SwiftABIVersion = (Val & 0xff00) >> 8;
SwiftMajorVersion = (Val & 0xff000000) >> 24;
SwiftMinorVersion = (Val & 0xff0000) >> 16;
}
Metadata *Ops[3] = {
ConstantAsMetadata::get(ConstantInt::get(Int32Ty,Module::Error)),
Op->getOperand(1),
ConstantAsMetadata::get(ConstantInt::get(Int8Ty,Val & 0xff))};
ModFlags->setOperand(I, MDNode::get(M.getContext(), Ops));
Changed = true;
}
}
}
// "Objective-C Class Properties" is recently added for Objective-C. We
@ -4080,6 +4111,16 @@ bool llvm::UpgradeModuleFlags(Module &M) {
Changed = true;
}
if (HasSwiftVersionFlag) {
M.addModuleFlag(Module::Error, "Swift ABI Version",
SwiftABIVersion);
M.addModuleFlag(Module::Error, "Swift Major Version",
ConstantInt::get(Int8Ty, SwiftMajorVersion));
M.addModuleFlag(Module::Error, "Swift Minor Version",
ConstantInt::get(Int8Ty, SwiftMinorVersion));
Changed = true;
}
return Changed;
}

21
llvm/test/Bitcode/upgrade-garbage-collection-for-objc.ll Normal file
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@ -0,0 +1,21 @@
; RUN: llvm-as %s -o - | llvm-dis - | FileCheck %s
; The IRUpgrader turns a i32 type "Objective-C Garbage Collection"
; into i8 value.
target triple = "x86_64-apple-macosx10.15.0"
!llvm.module.flags = !{!0, !1, !2, !3, !4, !5, !6, !7}
!llvm.ident = !{!8}
!0 = !{i32 2, !"SDK Version", [2 x i32] [i32 10, i32 15]}
!1 = !{i32 1, !"Objective-C Version", i32 2}
!2 = !{i32 1, !"Objective-C Image Info Version", i32 0}
!3 = !{i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
!4 = !{i32 1, !"Objective-C Garbage Collection", i32 0}
!5 = !{i32 1, !"Objective-C Class Properties", i32 64}
!6 = !{i32 1, !"wchar_size", i32 4}
!7 = !{i32 7, !"PIC Level", i32 2}
!8 = !{!"Apple clang version 11.0.0 (clang-1100.0.33.12)"}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Objective-C Garbage Collection", i8 0}

41
llvm/test/Bitcode/upgrade-garbage-collection-for-swift.ll Normal file
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@ -0,0 +1,41 @@
; RUN: llvm-as %s -o - | llvm-dis - | FileCheck %s
; The IRUpgrader turns a i32 type "Objective-C Garbage Collection"
; into i8 value. If the higher bits are set, it adds the module flag for swift info.
target triple = "x86_64-apple-macosx10.15.0"
@__swift_reflection_version = linkonce_odr hidden constant i16 3
@llvm.used = appending global [1 x i8*] [i8* bitcast (i16* @__swift_reflection_version to i8*)], section "llvm.metadata", align 8
define i32 @main(i32 %0, i8** %1) #0 {
%3 = bitcast i8** %1 to i8*
ret i32 0
}
attributes #0 = { "frame-pointer"="all" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sahf,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" }
!llvm.module.flags = !{!0, !1, !2, !3, !4, !5, !6, !7, !8}
!swift.module.flags = !{!9}
!llvm.linker.options = !{!10, !11, !12}
!llvm.asan.globals = !{!13}
!0 = !{i32 2, !"SDK Version", [2 x i32] [i32 10, i32 15]}
!1 = !{i32 1, !"Objective-C Version", i32 2}
!2 = !{i32 1, !"Objective-C Image Info Version", i32 0}
!3 = !{i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
!4 = !{i32 4, !"Objective-C Garbage Collection", i32 83953408}
!5 = !{i32 1, !"Objective-C Class Properties", i32 64}
!6 = !{i32 1, !"wchar_size", i32 4}
!7 = !{i32 7, !"PIC Level", i32 2}
!8 = !{i32 1, !"Swift Version", i32 7}
!9 = !{!"standard-library", i1 false}
!10 = !{!"-lswiftSwiftOnoneSupport"}
!11 = !{!"-lswiftCore"}
!12 = !{!"-lobjc"}
!13 = !{[1 x i8*]* @llvm.used, null, null, i1 false, i1 true}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Objective-C Garbage Collection", i8 0}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Swift ABI Version", i32 7}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Swift Major Version", i8 5}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Swift Minor Version", i8 1}

14
llvm/test/Linker/Inputs/empty-objc.ll Normal file
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@ -0,0 +1,14 @@
target triple = "x86_64-apple-macosx10.15.0"
!llvm.module.flags = !{!0, !1, !2, !3, !4, !5, !6, !7}
!llvm.ident = !{!8}
!0 = !{i32 2, !"SDK Version", [2 x i32] [i32 10, i32 15]}
!1 = !{i32 1, !"Objective-C Version", i32 2}
!2 = !{i32 1, !"Objective-C Image Info Version", i32 0}
!3 = !{i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
!4 = !{i32 1, !"Objective-C Garbage Collection", i32 0}
!5 = !{i32 1, !"Objective-C Class Properties", i32 64}
!6 = !{i32 1, !"wchar_size", i32 4}
!7 = !{i32 7, !"PIC Level", i32 2}
!8 = !{!"Apple clang version 11.0.0 (clang-1100.0.33.12)"}

42
llvm/test/Linker/empty-swift.ll Normal file
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@ -0,0 +1,42 @@
; RUN: llvm-link %s %p/Inputs/empty-objc.ll -S | FileCheck %s
; It tests whether Swift bitcode can be successfully linked with Objecitive-C bitcode.
; During the process, the IRUpgrader turns a i32 type "Objective-C Garbage Collection"
; into i8 value. If the higher bits are set, it adds the module flag for swift info.
target triple = "x86_64-apple-macosx10.15.0"
@__swift_reflection_version = linkonce_odr hidden constant i16 3
@llvm.used = appending global [1 x i8*] [i8* bitcast (i16* @__swift_reflection_version to i8*)], section "llvm.metadata", align 8
define i32 @main(i32 %0, i8** %1) #0 {
%3 = bitcast i8** %1 to i8*
ret i32 0
}
attributes #0 = { "frame-pointer"="all" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sahf,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" }
!llvm.module.flags = !{!0, !1, !2, !3, !4, !5, !6, !7, !8}
!swift.module.flags = !{!9}
!llvm.linker.options = !{!10, !11, !12}
!llvm.asan.globals = !{!13}
!0 = !{i32 2, !"SDK Version", [2 x i32] [i32 10, i32 15]}
!1 = !{i32 1, !"Objective-C Version", i32 2}
!2 = !{i32 1, !"Objective-C Image Info Version", i32 0}
!3 = !{i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
!4 = !{i32 4, !"Objective-C Garbage Collection", i32 83953408}
!5 = !{i32 1, !"Objective-C Class Properties", i32 64}
!6 = !{i32 1, !"wchar_size", i32 4}
!7 = !{i32 7, !"PIC Level", i32 2}
!8 = !{i32 1, !"Swift Version", i32 7}
!9 = !{!"standard-library", i1 false}
!10 = !{!"-lswiftSwiftOnoneSupport"}
!11 = !{!"-lswiftCore"}
!12 = !{!"-lobjc"}
!13 = !{[1 x i8*]* @llvm.used, null, null, i1 false, i1 true}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Objective-C Garbage Collection", i8 0}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Swift ABI Version", i32 7}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Swift Major Version", i8 5}
; CHECK: !{{[0-9]+}} = !{i32 1, !"Swift Minor Version", i8 1}

46
llvm/test/Object/objc-swift-mixed-imageinfo-macho.ll Normal file
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@ -0,0 +1,46 @@
; RUN: llc -mtriple x86_64-apple-ios -filetype asm -o - %s | FileCheck %s
; REQUIRES: x86-registered-target
; It checks whether the backend generates IMAGE_INFO from Swift ABI version + major + minor + "Objective-C Garbage Collection".
target triple = "x86_64-apple-macosx10.15.0"
@llvm.used = appending global [1 x i8*] [i8* bitcast (i16* @__swift_reflection_version to i8*)], section "llvm.metadata", align 8
@__swift_reflection_version = linkonce_odr hidden constant i16 3
define i32 @main(i32 %0, i8** %1) #0 {
%3 = bitcast i8** %1 to i8*
ret i32 0
}
attributes #0 = { "frame-pointer"="all" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sahf,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" }
!swift.module.flags = !{!0}
!llvm.linker.options = !{!1, !2, !3}
!llvm.asan.globals = !{!4}
!llvm.module.flags = !{!5, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15, !16}
!llvm.ident = !{!17}
!0 = !{!"standard-library", i1 false}
!1 = !{!"-lswiftSwiftOnoneSupport"}
!2 = !{!"-lswiftCore"}
!3 = !{!"-lobjc"}
!4 = !{[1 x i8*]* @llvm.used, null, null, i1 false, i1 true}
!5 = !{i32 2, !"SDK Version", [2 x i32] [i32 10, i32 15]}
!6 = !{i32 1, !"Objective-C Version", i32 2}
!7 = !{i32 1, !"Objective-C Image Info Version", i32 0}
!8 = !{i32 1, !"Objective-C Image Info Section", !"__DATA,__objc_imageinfo,regular,no_dead_strip"}
!9 = !{i32 1, !"Objective-C Garbage Collection", i8 0}
!10 = !{i32 1, !"Objective-C Class Properties", i32 64}
!11 = !{i32 1, !"wchar_size", i32 4}
!12 = !{i32 7, !"PIC Level", i32 2}
!13 = !{i32 1, !"Swift Version", i32 7}
!14 = !{i32 1, !"Swift ABI Version", i32 7}
!15 = !{i32 1, !"Swift Major Version", i8 5}
!16 = !{i32 1, !"Swift Minor Version", i8 1}
!17 = !{!"Apple clang version 11.0.0 (clang-1100.0.33.12)"}
; CHECK: .section __DATA,__objc_imageinfo,regular,no_dead_strip
; CHECK: L_OBJC_IMAGE_INFO:
; CHECK: .long 0
; CHECK: .long 83953472