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Revert "[BPF] Add preserve_access_index attribute for record definition" 

This reverts commit 4a5aa1a7bf.

There are some other test failures. Investigate them first.
This commit is contained in:
Yonghong Song 2019-11-09 08:32:44 -08:00
parent 4a5aa1a7bf
commit 9434360401
14 changed files with 8 additions and 448 deletions
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7
clang/include/clang/Basic/Attr.td
View File

@ -332,7 +332,6 @@ class TargetArch<list<string> arches> : TargetSpec {
}
def TargetARM : TargetArch<["arm", "thumb", "armeb", "thumbeb"]>;
def TargetAVR : TargetArch<["avr"]>;
def TargetBPF : TargetArch<["bpfel", "bpfeb"]>;
def TargetMips32 : TargetArch<["mips", "mipsel"]>;
def TargetAnyMips : TargetArch<["mips", "mipsel", "mips64", "mips64el"]>;
def TargetMSP430 : TargetArch<["msp430"]>;
@ -1579,12 +1578,6 @@ def AMDGPUNumVGPR : InheritableAttr {
let Subjects = SubjectList<[Function], ErrorDiag, "kernel functions">;
}
def BPFPreserveAccessIndex : InheritableAttr,
TargetSpecificAttr<TargetBPF> {
let Spellings = [Clang<"preserve_access_index">];
let Documentation = [BPFPreserveAccessIndexDocs];
}
def WebAssemblyImportModule : InheritableAttr,
TargetSpecificAttr<TargetWebAssembly> {
let Spellings = [Clang<"import_module">];

11
clang/include/clang/Basic/AttrDocs.td
View File

@ -1634,17 +1634,6 @@ The semantics are as follows:
}];
}
def BPFPreserveAccessIndexDocs : Documentation {
let Category = DocCatFunction;
let Content = [{
Clang supports the ``__attribute__((preserve_access_index))``
attribute for the BPF target. This attribute may be attached to a
struct or union declaration, where if -g is specified, it enables
preserving struct or union member access debuginfo indicies of this
struct or union, similar to clang ``__builtin_preserve_acceess_index()``.
}];
}
def MipsInterruptDocs : Documentation {
let Category = DocCatFunction;
let Heading = "interrupt (MIPS)";

1
clang/include/clang/Basic/DiagnosticSemaKinds.td
View File

@ -10065,7 +10065,6 @@ def err_preserve_field_info_not_field : Error<
"__builtin_preserve_field_info argument %0 not a field access">;
def err_preserve_field_info_not_const: Error<
"__builtin_preserve_field_info argument %0 not a constant">;
def err_preserve_access_index_wrong_type: Error<"%0 attribute only applies to %1">;
def err_bit_cast_non_trivially_copyable : Error<
"__builtin_bit_cast %select{source|destination}0 type must be trivially copyable">;

75
clang/lib/CodeGen/CGExpr.cpp
View File

@ -3402,67 +3402,11 @@ static QualType getFixedSizeElementType(const ASTContext &ctx,
return eltType;
}
/// Given an array base, check whether its member access belongs to a record
/// with preserve_access_index attribute or not.
static bool IsPreserveAIArrayBase(CodeGenFunction &CGF, const Expr *ArrayBase) {
if (!ArrayBase || !CGF.getDebugInfo())
return false;
const auto *ImplicitCast = dyn_cast<ImplicitCastExpr>(ArrayBase);
if (!ImplicitCast)
return false;
// Only support base as either a MemberExpr or DeclRefExpr.
// DeclRefExpr to cover cases like:
// struct s { int a; int b[10]; };
// struct s *p;
// p[1].a
// p[1] will generate a DeclRefExpr and p[1].a is a MemberExpr.
// p->b[5] is a MemberExpr example.
const Expr *E = ImplicitCast->getSubExpr();
const auto *MemberCast = dyn_cast<MemberExpr>(E);
if (MemberCast)
return MemberCast->getMemberDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
const auto *DeclRefCast = dyn_cast<DeclRefExpr>(E);
if (DeclRefCast) {
const VarDecl *VarDef = dyn_cast<VarDecl>(DeclRefCast->getDecl());
if (!VarDef)
return false;
const auto *PtrT = dyn_cast<PointerType>(VarDef->getType().getTypePtr());
if (!PtrT)
return false;
const auto *PointeeT = PtrT->getPointeeType().getTypePtr();
// Peel off typedef's
const auto *TypedefT = dyn_cast<TypedefType>(PointeeT);
while (TypedefT) {
PointeeT = TypedefT->desugar().getTypePtr();
TypedefT = dyn_cast<TypedefType>(PointeeT);
}
// Not a typedef any more, it should be an elaborated type.
const auto ElaborateT = dyn_cast<ElaboratedType>(PointeeT);
if (!ElaborateT)
return false;
const auto *RecT = dyn_cast<RecordType>(ElaborateT->desugar().getTypePtr());
if (!RecT)
return false;
return RecT->getDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
}
return false;
}
static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
ArrayRef<llvm::Value *> indices,
QualType eltType, bool inbounds,
bool signedIndices, SourceLocation loc,
QualType *arrayType = nullptr,
const Expr *Base = nullptr,
const llvm::Twine &name = "arrayidx") {
// All the indices except that last must be zero.
#ifndef NDEBUG
@ -3484,8 +3428,7 @@ static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
llvm::Value *eltPtr;
auto LastIndex = dyn_cast<llvm::ConstantInt>(indices.back());
if (!LastIndex ||
(!CGF.IsInPreservedAIRegion && !IsPreserveAIArrayBase(CGF, Base))) {
if (!CGF.IsInPreservedAIRegion || !LastIndex) {
eltPtr = emitArraySubscriptGEP(
CGF, addr.getPointer(), indices, inbounds, signedIndices,
loc, name);
@ -3639,7 +3582,7 @@ LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
Addr = emitArraySubscriptGEP(
*this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
E->getExprLoc(), &arrayType, E->getBase());
E->getExprLoc(), &arrayType);
EltBaseInfo = ArrayLV.getBaseInfo();
EltTBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, E->getType());
} else {
@ -3649,8 +3592,7 @@ LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
QualType ptrType = E->getBase()->getType();
Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
!getLangOpts().isSignedOverflowDefined(),
SignedIndices, E->getExprLoc(), &ptrType,
E->getBase());
SignedIndices, E->getExprLoc(), &ptrType);
}
LValue LV = MakeAddrLValue(Addr, E->getType(), EltBaseInfo, EltTBAAInfo);
@ -4051,13 +3993,12 @@ LValue CodeGenFunction::EmitLValueForField(LValue base,
const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
Address Addr = base.getAddress();
unsigned Idx = RL.getLLVMFieldNo(field);
const RecordDecl *rec = field->getParent();
if (!IsInPreservedAIRegion &&
(!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
if (!IsInPreservedAIRegion) {
if (Idx != 0)
// For structs, we GEP to the field that the record layout suggests.
Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
} else {
const RecordDecl *rec = field->getParent();
llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
getContext().getRecordType(rec), rec->getLocation());
Addr = Builder.CreatePreserveStructAccessIndex(Addr, Idx,
@ -4140,8 +4081,7 @@ LValue CodeGenFunction::EmitLValueForField(LValue base,
addr = Address(Builder.CreateLaunderInvariantGroup(addr.getPointer()),
addr.getAlignment());
if (IsInPreservedAIRegion ||
(getDebugInfo() && rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
if (IsInPreservedAIRegion) {
// Remember the original union field index
llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
getContext().getRecordType(rec), rec->getLocation());
@ -4155,8 +4095,7 @@ LValue CodeGenFunction::EmitLValueForField(LValue base,
addr = Builder.CreateElementBitCast(
addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
} else {
if (!IsInPreservedAIRegion &&
(!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>()))
if (!IsInPreservedAIRegion)
// For structs, we GEP to the field that the record layout suggests.
addr = emitAddrOfFieldStorage(*this, addr, field);
else

66
clang/lib/Sema/SemaDeclAttr.cpp
View File

@ -5700,59 +5700,6 @@ static void handleAVRSignalAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
handleSimpleAttribute<AVRSignalAttr>(S, D, AL);
}
static void handleBPFPreserveAIRecord(Sema &S, RecordDecl *RD,
const BPFPreserveAccessIndexAttr &AL) {
// Add preserve_access_index attribute to all fields and inner records.
for (DeclContext::decl_iterator D = RD->decls_begin(), DEnd = RD->decls_end();
D != DEnd; ++D) {
// Any member or inner struct having attribute means done.
if (D->hasAttr<BPFPreserveAccessIndexAttr>())
return;
RecordDecl *Rec = dyn_cast<RecordDecl>(*D);
if (Rec) {
Rec->addAttr(::new (S.Context) BPFPreserveAccessIndexAttr(S.Context, AL));
handleBPFPreserveAIRecord(S, Rec, AL);
} else {
D->addAttr(::new (S.Context) BPFPreserveAccessIndexAttr(S.Context, AL));
}
}
}
static void handleBPFPreserveAIRecord(Sema &S, RecordDecl *RD,
const ParsedAttr &AL) {
// Add preserve_access_index attribute to all fields and inner records.
for (DeclContext::decl_iterator D = RD->decls_begin(), DEnd = RD->decls_end();
D != DEnd; ++D) {
RecordDecl *Rec = dyn_cast<RecordDecl>(*D);
if (Rec) {
// Inner record may have been processed.
if (!Rec->hasAttr<BPFPreserveAccessIndexAttr>()) {
Rec->addAttr(::new (S.Context) BPFPreserveAccessIndexAttr(S.Context, AL));
handleBPFPreserveAIRecord(S, Rec, AL);
}
} else {
D->addAttr(::new (S.Context) BPFPreserveAccessIndexAttr(S.Context, AL));
}
}
}
static void handleBPFPreserveAccessIndexAttr(Sema &S, Decl *D,
const ParsedAttr &AL) {
RecordDecl *Rec = dyn_cast<RecordDecl>(D);
if (!Rec) {
S.Diag(D->getLocation(), diag::err_preserve_access_index_wrong_type)
<< "preserve_addess_index" << "struct or union type";
return;
}
if (!checkAttributeNumArgs(S, AL, 0))
return;
handleBPFPreserveAIRecord(S, Rec, AL);
Rec->addAttr(::new (S.Context) BPFPreserveAccessIndexAttr(S.Context, AL));
}
static void handleWebAssemblyImportModuleAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (!isFunctionOrMethod(D)) {
S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
@ -6629,9 +6576,6 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
case ParsedAttr::AT_AVRSignal:
handleAVRSignalAttr(S, D, AL);
break;
case ParsedAttr::AT_BPFPreserveAccessIndex:
handleBPFPreserveAccessIndexAttr(S, D, AL);
break;
case ParsedAttr::AT_WebAssemblyImportModule:
handleWebAssemblyImportModuleAttr(S, D, AL);
break;
@ -7381,8 +7325,7 @@ void Sema::ProcessDeclAttributeList(Scope *S, Decl *D,
}
}
// Helper for delayed processing TransparentUnion or BPFPreserveAccessIndexAttr
// attribute.
// Helper for delayed processing TransparentUnion attribute.
void Sema::ProcessDeclAttributeDelayed(Decl *D,
const ParsedAttributesView &AttrList) {
for (const ParsedAttr &AL : AttrList)
@ -7390,13 +7333,6 @@ void Sema::ProcessDeclAttributeDelayed(Decl *D,
handleTransparentUnionAttr(*this, D, AL);
break;
}
// For BPFPreserveAccessIndexAttr, we want to populate the attributes
// to fields and inner records as well.
if (D->hasAttr<BPFPreserveAccessIndexAttr>()) {
handleBPFPreserveAIRecord(*this, cast<RecordDecl>(D),
*D->getAttr<BPFPreserveAccessIndexAttr>());
}
}
// Annotation attributes are the only attributes allowed after an access

23
clang/test/CodeGen/bpf-attr-preserve-access-index-1.c
View File

@ -1,23 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// test simple member access and initial struct with non-zero stride access
struct s1 {
int a;
union {
int b;
int c;
};
} __reloc__;
typedef struct s1 __s1;
int test(__s1 *arg) {
return arg->a + arg[1].b;
}
// CHECK: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 1)
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 1, i32 1)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 0)

24
clang/test/CodeGen/bpf-attr-preserve-access-index-2.c
View File

@ -1,24 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// test array access
struct s1 {
int a[3];
union {
int b;
int c[4];
};
} __reloc__;
typedef struct s1 __s1;
int test(__s1 *arg) {
return arg->a[2] + arg->c[2];
}
// CHECK: call [3 x i32]* @llvm.preserve.struct.access.index.p0a3i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call i32* @llvm.preserve.array.access.index.p0i32.p0a3i32([3 x i32]* %{{[0-9a-z]+}}, i32 1, i32 2)
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 1, i32 1)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 1)
// CHECK: call i32* @llvm.preserve.array.access.index.p0i32.p0a4i32([4 x i32]* %{{[0-9a-z]+}}, i32 1, i32 2)

32
clang/test/CodeGen/bpf-attr-preserve-access-index-3.c
View File

@ -1,32 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// chain of records, all with attributes
struct s1 {
int c;
} __reloc__;
typedef struct s1 __s1;
struct s2 {
union {
__s1 b[3];
};
} __reloc__;
typedef struct s2 __s2;
struct s3 {
__s2 a;
} __reloc__;
typedef struct s3 __s3;
int test(__s3 *arg) {
return arg->a.b[2].c;
}
// CHECK: call %struct.s2* @llvm.preserve.struct.access.index.p0s_struct.s2s.p0s_struct.s3s(%struct.s3* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s2s(%struct.s2* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0a3s_struct.s1s([3 x %struct.s1]* %{{[0-9a-z]+}}, i32 1, i32 2)
// CHECK: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)

33
clang/test/CodeGen/bpf-attr-preserve-access-index-4.c
View File

@ -1,33 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// chain of records, some do not have attributes.
struct s1 {
int c;
};
typedef struct s1 __s1;
struct s2 {
union {
__s1 b[3];
};
} __reloc__;
typedef struct s2 __s2;
struct s3 {
__s2 a;
};
typedef struct s3 __s3;
int test(__s3 *arg) {
return arg->a.b[2].c;
}
// CHECK: define dso_local i32 @test
// CHECK-NOT: call %struct.s2* @llvm.preserve.struct.access.index.p0s_struct.s2s.p0s_struct.s3s
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s2s(%struct.s2* %a, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %1, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0a3s_struct.s1s([3 x %struct.s1]* %b, i32 1, i32 2)
// CHECK-NOT: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s

32
clang/test/CodeGen/bpf-attr-preserve-access-index-5.c
View File

@ -1,32 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// chain of records, attribute may be in inner record.
struct s1 {
int c;
} __reloc__;
typedef struct s1 __s1;
struct s2 {
union {
__s1 b[3];
} __reloc__;
};
typedef struct s2 __s2;
struct s3 {
__s2 a;
} __reloc__;
typedef struct s3 __s3;
int test(__s3 *arg) {
return arg->a.b[2].c;
}
// CHECK: call %struct.s2* @llvm.preserve.struct.access.index.p0s_struct.s2s.p0s_struct.s3s(%struct.s3* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK-NOT: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s2s
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0a3s_struct.s1s([3 x %struct.s1]* %{{[0-9a-z]+}}, i32 1, i32 2)
// CHECK: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)

32
clang/test/CodeGen/bpf-attr-preserve-access-index-6.c
View File

@ -1,32 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// chain of records, both inner and outer record have attributes.
struct s1 {
int c;
} __reloc__;
typedef struct s1 __s1;
struct s2 {
union {
__s1 b[3];
} __reloc__;
} __reloc__;
typedef struct s2 __s2;
struct s3 {
__s2 a;
} __reloc__;
typedef struct s3 __s3;
int test(__s3 *arg) {
return arg->a.b[2].c;
}
// CHECK: call %struct.s2* @llvm.preserve.struct.access.index.p0s_struct.s2s.p0s_struct.s3s(%struct.s3* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s2s(%struct.s2* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0a3s_struct.s1s([3 x %struct.s1]* %{{[0-9a-z]+}}, i32 1, i32 2)
// CHECK: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)

36
clang/test/CodeGen/bpf-attr-preserve-access-index-7.c
View File

@ -1,36 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// chain of records, all with attributes
struct __reloc__ s1;
struct __reloc__ s2;
struct __reloc__ s3;
struct s1 {
int c;
};
typedef struct s1 __s1;
struct s2 {
union {
__s1 b[3];
};
};
typedef struct s2 __s2;
struct s3 {
__s2 a;
};
typedef struct s3 __s3;
int test(__s3 *arg) {
return arg->a.b[2].c;
}
// CHECK: call %struct.s2* @llvm.preserve.struct.access.index.p0s_struct.s2s.p0s_struct.s3s(%struct.s3* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s2s(%struct.s2* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0a3s_struct.s1s([3 x %struct.s1]* %{{[0-9a-z]+}}, i32 1, i32 2)
// CHECK: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)

36
clang/test/CodeGen/bpf-attr-preserve-access-index-8.c
View File

@ -1,36 +0,0 @@
// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s
#define __reloc__ __attribute__((preserve_access_index))
// chain of records, all with attributes
struct s1;
struct s2;
struct s3;
struct s1 {
int c;
} __reloc__;
typedef struct s1 __s1;
struct s2 {
union {
__s1 b[3];
};
} __reloc__;
typedef struct s2 __s2;
struct s3 {
__s2 a;
} __reloc__;
typedef struct s3 __s3;
int test(__s3 *arg) {
return arg->a.b[2].c;
}
// CHECK: call %struct.s2* @llvm.preserve.struct.access.index.p0s_struct.s2s.p0s_struct.s3s(%struct.s3* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s2s(%struct.s2* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0a3s_struct.s1s([3 x %struct.s1]* %{{[0-9a-z]+}}, i32 1, i32 2)
// CHECK: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)

48
clang/test/Sema/bpf-attr-preserve-access-index.c
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@ -1,48 +0,0 @@
// RUN: %clang_cc1 -x c -triple bpf-pc-linux-gnu -dwarf-version=4 -fsyntax-only -verify %s
#define __reloc__ __attribute__((preserve_access_index))
#define __err_reloc__ __attribute__((preserve_access_index(0)))
struct t1 {
int a;
int b[4];
int c:1;
} __reloc__;
union t2 {
int a;
int b[4];
int c:1;
} __reloc__;
struct t3 {
int a;
} __err_reloc__; // expected-error {{'preserve_access_index' attribute takes no arguments}}
struct t4 {
union {
int a;
char b[5];
};
struct {
int c:1;
} __reloc__;
int d;
} __reloc__;
struct __reloc__ p;
struct __reloc__ q;
struct p {
int a;
};
int a __reloc__; // expected-error {{preserve_addess_index attribute only applies to struct or union type}}
struct s *p __reloc__; // expected-error {{preserve_addess_index attribute only applies to struct or union type}}
void invalid1(const int __reloc__ *arg) {} // expected-error {{preserve_addess_index attribute only applies to struct or union type}}
void invalid2() { const int __reloc__ *arg; } // expected-error {{preserve_addess_index attribute only applies to struct or union type}}
int valid3(struct t4 *arg) { return arg->a + arg->b[3] + arg->c + arg->d; }
int valid4(void *arg) {
struct local_t { int a; int b; } __reloc__;
return ((struct local_t *)arg)->b;
}