[Clang] Loop over FieldDecls instead of all Decls #99574
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Only FieldDecls are important when determining GEP indices. A struct defined within another struct has the same semantics as if it were defined outside of the struct. So there's no need to look into RecordDecls that aren't a field. See commit 5bcf31e ("[Clang] Loop over FieldDecls instead of all Decls (llvm#89453)") Fixes 2039.
llvmbot
added
clang
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@llvm/pr-subscribers-clang @llvm/pr-subscribers-clang-codegen Author: Bill Wendling (bwendling) ChangesOnly FieldDecls are important when determining GEP indices. A struct defined within another struct has the same semantics as if it were defined outside of the struct. So there's no need to look into RecordDecls that aren't a field. See commit 5bcf31e ("[Clang] Loop over FieldDecls instead of all Decls (#89453)") Fixes 2039. Full diff: https://github.com/llvm/llvm-project/pull/99574.diff 2 Files Affected:
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 6a0af00b9e186..69fa05e7a94ea 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -1071,21 +1071,19 @@ using RecIndicesTy =
SmallVector<std::pair<const RecordDecl *, llvm::Value *>, 8>;
static bool getGEPIndicesToField(CodeGenFunction &CGF, const RecordDecl *RD,
- const FieldDecl *FD, RecIndicesTy &Indices) {
+ const FieldDecl *Field, RecIndicesTy &Indices) {
const CGRecordLayout &Layout = CGF.CGM.getTypes().getCGRecordLayout(RD);
int64_t FieldNo = -1;
- for (const Decl *D : RD->decls()) {
- if (const auto *Field = dyn_cast<FieldDecl>(D)) {
- FieldNo = Layout.getLLVMFieldNo(Field);
- if (FD == Field) {
- Indices.emplace_back(std::make_pair(RD, CGF.Builder.getInt32(FieldNo)));
- return true;
- }
+ for (const FieldDecl *FD : RD->fields()) {
+ FieldNo = Layout.getLLVMFieldNo(FD);
+ if (FD == Field) {
+ Indices.emplace_back(std::make_pair(RD, CGF.Builder.getInt32(FieldNo)));
+ return true;
}
- if (const auto *Record = dyn_cast<RecordDecl>(D)) {
- ++FieldNo;
- if (getGEPIndicesToField(CGF, Record, FD, Indices)) {
+ QualType Ty = FD->getType();
+ if (Ty->isRecordType()) {
+ if (getGEPIndicesToField(CGF, Ty->getAsRecordDecl(), Field, Indices)) {
if (RD->isUnion())
FieldNo = 0;
Indices.emplace_back(std::make_pair(RD, CGF.Builder.getInt32(FieldNo)));
diff --git a/clang/test/CodeGen/attr-counted-by.c b/clang/test/CodeGen/attr-counted-by.c
index 79922eb4159f1..32db136076d7d 100644
--- a/clang/test/CodeGen/attr-counted-by.c
+++ b/clang/test/CodeGen/attr-counted-by.c
@@ -1852,3 +1852,57 @@ struct annotated_struct_array {
void test29(struct annotated_struct_array *ann, int idx1, int idx2) {
ann->ann_array[idx1]->array[idx2] = __builtin_dynamic_object_size(ann->ann_array[idx1]->array, 1);
}
+
+typedef struct {
+ char __padding[0];
+} test30_spinlock_t;
+
+struct test30_struct {
+ struct test30_decl *name_node;
+ int priv_len;
+ test30_spinlock_t pcpu_refcnt;
+ char priv[] __counted_by(priv_len);
+};
+
+// SANITIZE-WITH-ATTR-LABEL: define dso_local void @test30(
+// SANITIZE-WITH-ATTR-SAME: ptr noundef [[PTR:%.*]], i32 noundef [[IDX:%.*]]) local_unnamed_addr #[[ATTR5]] {
+// SANITIZE-WITH-ATTR-NEXT: entry:
+// SANITIZE-WITH-ATTR-NEXT: [[TMP0:%.*]] = zext i32 [[IDX]] to i64, !nosanitize [[META2]]
+// SANITIZE-WITH-ATTR-NEXT: tail call void @__ubsan_handle_out_of_bounds_abort(ptr nonnull @[[GLOB39:[0-9]+]], i64 [[TMP0]]) #[[ATTR10]], !nosanitize [[META2]]
+// SANITIZE-WITH-ATTR-NEXT: unreachable, !nosanitize [[META2]]
+//
+// NO-SANITIZE-WITH-ATTR-LABEL: define dso_local void @test30(
+// NO-SANITIZE-WITH-ATTR-SAME: ptr nocapture noundef [[PTR:%.*]], i32 noundef [[IDX:%.*]]) local_unnamed_addr #[[ATTR1]] {
+// NO-SANITIZE-WITH-ATTR-NEXT: entry:
+// NO-SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR]], i64 8
+// NO-SANITIZE-WITH-ATTR-NEXT: [[DOT_COUNTED_BY_LOAD:%.*]] = load i32, ptr [[DOT_COUNTED_BY_GEP]], align 4
+// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP0:%.*]] = tail call i32 @llvm.smax.i32(i32 [[DOT_COUNTED_BY_LOAD]], i32 4)
+// NO-SANITIZE-WITH-ATTR-NEXT: [[DOTINV:%.*]] = icmp slt i32 [[DOT_COUNTED_BY_LOAD]], 0
+// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP1:%.*]] = trunc i32 [[TMP0]] to i8
+// NO-SANITIZE-WITH-ATTR-NEXT: [[TMP2:%.*]] = add i8 [[TMP1]], 12
+// NO-SANITIZE-WITH-ATTR-NEXT: [[CONV:%.*]] = select i1 [[DOTINV]], i8 0, i8 [[TMP2]]
+// NO-SANITIZE-WITH-ATTR-NEXT: [[PCPU_REFCNT:%.*]] = getelementptr inbounds i8, ptr [[PTR]], i64 12
+// NO-SANITIZE-WITH-ATTR-NEXT: [[IDXPROM:%.*]] = sext i32 [[IDX]] to i64
+// NO-SANITIZE-WITH-ATTR-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [0 x i8], ptr [[PCPU_REFCNT]], i64 0, i64 [[IDXPROM]]
+// NO-SANITIZE-WITH-ATTR-NEXT: store i8 [[CONV]], ptr [[ARRAYIDX]], align 1, !tbaa [[TBAA6]]
+// NO-SANITIZE-WITH-ATTR-NEXT: ret void
+//
+// SANITIZE-WITHOUT-ATTR-LABEL: define dso_local void @test30(
+// SANITIZE-WITHOUT-ATTR-SAME: ptr noundef [[PTR:%.*]], i32 noundef [[IDX:%.*]]) local_unnamed_addr #[[ATTR3]] {
+// SANITIZE-WITHOUT-ATTR-NEXT: entry:
+// SANITIZE-WITHOUT-ATTR-NEXT: [[TMP0:%.*]] = zext i32 [[IDX]] to i64, !nosanitize [[META9]]
+// SANITIZE-WITHOUT-ATTR-NEXT: tail call void @__ubsan_handle_out_of_bounds_abort(ptr nonnull @[[GLOB15:[0-9]+]], i64 [[TMP0]]) #[[ATTR8]], !nosanitize [[META9]]
+// SANITIZE-WITHOUT-ATTR-NEXT: unreachable, !nosanitize [[META9]]
+//
+// NO-SANITIZE-WITHOUT-ATTR-LABEL: define dso_local void @test30(
+// NO-SANITIZE-WITHOUT-ATTR-SAME: ptr noundef [[PTR:%.*]], i32 noundef [[IDX:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// NO-SANITIZE-WITHOUT-ATTR-NEXT: entry:
+// NO-SANITIZE-WITHOUT-ATTR-NEXT: [[PCPU_REFCNT:%.*]] = getelementptr inbounds i8, ptr [[PTR]], i64 12
+// NO-SANITIZE-WITHOUT-ATTR-NEXT: [[IDXPROM:%.*]] = sext i32 [[IDX]] to i64
+// NO-SANITIZE-WITHOUT-ATTR-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [0 x i8], ptr [[PCPU_REFCNT]], i64 0, i64 [[IDXPROM]]
+// NO-SANITIZE-WITHOUT-ATTR-NEXT: store i8 -1, ptr [[ARRAYIDX]], align 1, !tbaa [[TBAA6]]
+// NO-SANITIZE-WITHOUT-ATTR-NEXT: ret void
+//
+void test30(struct test30_struct *ptr, int idx) {
+ ptr->pcpu_refcnt.__padding[idx] = __builtin_dynamic_object_size(ptr, 1);
+}
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✅ With the latest revision this PR passed the C/C++ code formatter. |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/51/builds/1493 Here is the relevant piece of the build log for the reference: |
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I see a crash in struct swait_queue_head {};
struct completion {
int done;
struct swait_queue_head wait;
};
struct {
struct completion removal;
int num_trips;
int trips[] __attribute__((__counted_by__(num_trips)));
} *thermal_zone_device_register_with_trips_tz;
int thermal_zone_device_register_with_trips() {
if (thermal_zone_device_register_with_trips_tz)
goto free_tz;
if (0)
goto free_tzp;
{
long __p_size_field = __builtin_dynamic_object_size(
thermal_zone_device_register_with_trips_tz, 1);
_Bool __ret_do_once = __p_size_field, __ret_cond = __ret_do_once;
static _Bool __already_done;
if (__builtin_expect(__ret_cond && __already_done, 0))
;
}
free_tzp:
free_tz:
return 0;
} |
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Okay. I'll look into it.
…On Sun, Jul 21, 2024 at 4:35 PM Nathan Chancellor ***@***.***> wrote:
I see a crash in drivers/thermal/thermal_core.c in Linux kernels without
commit daeeb032f42d
<https://git.kernel.org/linus/daeeb032f42d066a49e07b7f6effc9f51b7a5479>
("thermal: core: Move threshold out of struct thermal_trip") after this
change. cvise spits out:
struct swait_queue_head {};struct completion {
int done;
struct swait_queue_head wait;
};struct {
struct completion removal;
int num_trips;
int trips[] __attribute__((__counted_by__(num_trips)));
} *thermal_zone_device_register_with_trips_tz;int thermal_zone_device_register_with_trips() {
if (thermal_zone_device_register_with_trips_tz)
goto free_tz;
if (0)
goto free_tzp;
{
long __p_size_field = __builtin_dynamic_object_size(
thermal_zone_device_register_with_trips_tz, 1);
_Bool __ret_do_once = __p_size_field, __ret_cond = __ret_do_once;
static _Bool __already_done;
if (__builtin_expect(__ret_cond && __already_done, 0))
;
}
free_tzp:
free_tz:
return 0;
}
$ clang -c -o /dev/null thermal_core.i
clang: /home/nathan/tmp/cvise.YrEYUS5WBZ/src/clang/lib/CodeGen/CGRecordLayout.h:200: unsigned int clang::CodeGen::CGRecordLayout::getLLVMFieldNo(const FieldDecl *) const: Assertion `FieldInfo.count(FD) && "Invalid field for record!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: clang -c -o /dev/null thermal_core.i
1. <eof> parser at end of file
2. thermal_core.i:11:5: LLVM IR generation of declaration 'thermal_zone_device_register_with_trips'
3. thermal_core.i:11:5: Generating code for declaration 'thermal_zone_device_register_with_trips'
4. thermal_core.i:16:3: LLVM IR generation of compound statement ('{}')
#0 0x00005585369d0446 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x55fc446)
#1 0x00005585369cdf0e llvm::sys::RunSignalHandlers() (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x55f9f0e)
#2 0x00005585369513ad CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f3d209bdae0 (/usr/lib/libc.so.6+0x3cae0)
#4 0x00007f3d20a15e44 (/usr/lib/libc.so.6+0x94e44)
#5 0x00007f3d209bda30 raise (/usr/lib/libc.so.6+0x3ca30)
#6 0x00007f3d209a54c3 abort (/usr/lib/libc.so.6+0x244c3)
#7 0x00007f3d209a53df (/usr/lib/libc.so.6+0x243df)
#8 0x00007f3d209b5c67 (/usr/lib/libc.so.6+0x34c67)
#9 0x0000558536de6281 clang::CodeGen::CGRecordLayout::getLLVMFieldNo(clang::FieldDecl const*) const CGExpr.cpp:0:0
#10 0x0000558536dcd526 getGEPIndicesToField(clang::CodeGen::CodeGenFunction&, clang::RecordDecl const*, clang::FieldDecl const*, llvm::SmallVector<std::pair<clang::RecordDecl const*, llvm::Value*>, 8u>&) CGExpr.cpp:0:0
#11 0x0000558536dcd581 getGEPIndicesToField(clang::CodeGen::CodeGenFunction&, clang::RecordDecl const*, clang::FieldDecl const*, llvm::SmallVector<std::pair<clang::RecordDecl const*, llvm::Value*>, 8u>&) CGExpr.cpp:0:0
#12 0x0000558536dca542 clang::CodeGen::CodeGenFunction::EmitCountedByFieldExpr(clang::Expr const*, clang::FieldDecl const*, clang::FieldDecl const*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x59f6542)
#13 0x0000558536fb0927 clang::CodeGen::CodeGenFunction::emitFlexibleArrayMemberSize(clang::Expr const*, unsigned int, llvm::IntegerType*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5bdc927)
#14 0x0000558536fafdf8 clang::CodeGen::CodeGenFunction::emitBuiltinObjectSize(clang::Expr const*, unsigned int, llvm::IntegerType*, llvm::Value*, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5bdbdf8)
#15 0x0000558536fb9cfc clang::CodeGen::CodeGenFunction::EmitBuiltinExpr(clang::GlobalDecl, unsigned int, clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5be5cfc)
#16 0x0000558536de827c clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a1427c)
#17 0x0000558536e024cb (anonymous namespace)::ScalarExprEmitter::VisitCallExpr(clang::CallExpr const*) CGExprScalar.cpp:0:0
#18 0x0000558536dee27b (anonymous namespace)::ScalarExprEmitter::Visit(clang::Expr*) CGExprScalar.cpp:0:0
#19 0x0000558536e0bedd (anonymous namespace)::ScalarExprEmitter::VisitCastExpr(clang::CastExpr*) CGExprScalar.cpp:0:0
#20 0x0000558536dee11c clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a1a11c)
#21 0x0000558536e301e4 clang::CodeGen::CodeGenFunction::EmitScalarInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a5c1e4)
#22 0x0000558536e335d1 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a5f5d1)
#23 0x0000558536e2da7d clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a59a7d)
#24 0x0000558536e2d4b7 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a594b7)
#25 0x0000558536d66ddb clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5992ddb)
#26 0x0000558536d59acb clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5985acb)
#27 0x0000558536d58b33 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5984b33)
#28 0x0000558536d59aa1 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5985aa1)
#29 0x0000558536d58b33 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5984b33)
#30 0x0000558536d67f40 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5993f40)
#31 0x0000558536d44ee6 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5970ee6)
#32 0x0000558536bfb47b clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x582747b)
#33 0x0000558536bf2a75 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x581ea75)
#34 0x0000558536bf7a1a clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5823a1a)
#35 0x0000558536bf13e2 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x581d3e2)
#36 0x0000558537240fbc (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#37 0x0000558537237057 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5e63057)
#38 0x00005585386c199a clang::ParseAST(clang::Sema&, bool, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x72ed99a)
#39 0x00005585376ca08d clang::FrontendAction::Execute() (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x62f608d)
#40 0x000055853762e7ad clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x625a7ad)
#41 0x00005585377a673c clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x63d273c)
#42 0x0000558534a3220a cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x365e20a)
#43 0x0000558534a2e85d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#44 0x0000558537454199 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_0>(long) Job.cpp:0:0
#45 0x00005585369510e6 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x557d0e6)
#46 0x0000558537453833 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x607f833)
#47 0x000055853740b427 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x6037427)
#48 0x000055853740b987 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x6037987)
#49 0x000055853742e0e9 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x605a0e9)
#50 0x0000558534a2dcfd clang_main(int, char**, llvm::ToolContext const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x3659cfd)
#51 0x0000558534a3f806 main (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x366b806)
#52 0x00007f3d209a6c88 (/usr/lib/libc.so.6+0x25c88)
#53 0x00007f3d209a6d4c __libc_start_main (/usr/lib/libc.so.6+0x25d4c)
#54 0x0000558534a2c125 _start (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x3658125)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
ClangBuiltLinux clang version 19.0.0git (https://github.com/llvm/llvm-project.git 1f6f97e)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin
Build config: +assertions
clang: note: diagnostic msg: Error generating preprocessed source(s) - no preprocessable inputs.
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You are receiving this because you modified the open/close state.Message
ID: ***@***.***>
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+Eli Friedman ***@***.***>
I'm confused by what's going on. Here's a shorter testcase:
struct a {};
struct c {
int done;
struct a x;
};
struct b {
struct a y;
int s;
int x[] __attribute__((counted_by(s)));
};
int foo(struct b *p, int idx) {
return __builtin_dynamic_object_size(p, 0);
}
The CGRecordLayout doesn't have 'y' listed as a field. It shows 's' and
'x', but not 'y'... Yet the RecordDecl *does* have 'y' as a FieldDecl. My
only guess is that, because it's an empty struct, the
CGRecordLayout decides that it doesn't need to count it as part of the
record layout? That doesn't make a whole lot of sense to me. I realize that
it has zero size (in C), but I thought we'd still have to deal with it......
Eli, does that make any sense?
…-bw
On Mon, Jul 22, 2024 at 5:00 PM Bill Wendling ***@***.***> wrote:
Okay. I'll look into it.
On Sun, Jul 21, 2024 at 4:35 PM Nathan Chancellor <
***@***.***> wrote:
> I see a crash in drivers/thermal/thermal_core.c in Linux kernels without
> commit daeeb032f42d
> <https://git.kernel.org/linus/daeeb032f42d066a49e07b7f6effc9f51b7a5479>
> ("thermal: core: Move threshold out of struct thermal_trip") after this
> change. cvise spits out:
>
> struct swait_queue_head {};struct completion {
> int done;
> struct swait_queue_head wait;
> };struct {
> struct completion removal;
> int num_trips;
> int trips[] __attribute__((__counted_by__(num_trips)));
> } *thermal_zone_device_register_with_trips_tz;int thermal_zone_device_register_with_trips() {
> if (thermal_zone_device_register_with_trips_tz)
> goto free_tz;
> if (0)
> goto free_tzp;
> {
> long __p_size_field = __builtin_dynamic_object_size(
> thermal_zone_device_register_with_trips_tz, 1);
> _Bool __ret_do_once = __p_size_field, __ret_cond = __ret_do_once;
> static _Bool __already_done;
> if (__builtin_expect(__ret_cond && __already_done, 0))
> ;
> }
> free_tzp:
> free_tz:
> return 0;
> }
>
> $ clang -c -o /dev/null thermal_core.i
> clang: /home/nathan/tmp/cvise.YrEYUS5WBZ/src/clang/lib/CodeGen/CGRecordLayout.h:200: unsigned int clang::CodeGen::CGRecordLayout::getLLVMFieldNo(const FieldDecl *) const: Assertion `FieldInfo.count(FD) && "Invalid field for record!"' failed.
> PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
> Stack dump:
> 0. Program arguments: clang -c -o /dev/null thermal_core.i
> 1. <eof> parser at end of file
> 2. thermal_core.i:11:5: LLVM IR generation of declaration 'thermal_zone_device_register_with_trips'
> 3. thermal_core.i:11:5: Generating code for declaration 'thermal_zone_device_register_with_trips'
> 4. thermal_core.i:16:3: LLVM IR generation of compound statement ('{}')
> #0 0x00005585369d0446 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x55fc446)
> #1 0x00005585369cdf0e llvm::sys::RunSignalHandlers() (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x55f9f0e)
> #2 0x00005585369513ad CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
> #3 0x00007f3d209bdae0 (/usr/lib/libc.so.6+0x3cae0)
> #4 0x00007f3d20a15e44 (/usr/lib/libc.so.6+0x94e44)
> #5 0x00007f3d209bda30 raise (/usr/lib/libc.so.6+0x3ca30)
> #6 0x00007f3d209a54c3 abort (/usr/lib/libc.so.6+0x244c3)
> #7 0x00007f3d209a53df (/usr/lib/libc.so.6+0x243df)
> #8 0x00007f3d209b5c67 (/usr/lib/libc.so.6+0x34c67)
> #9 0x0000558536de6281 clang::CodeGen::CGRecordLayout::getLLVMFieldNo(clang::FieldDecl const*) const CGExpr.cpp:0:0
> #10 0x0000558536dcd526 getGEPIndicesToField(clang::CodeGen::CodeGenFunction&, clang::RecordDecl const*, clang::FieldDecl const*, llvm::SmallVector<std::pair<clang::RecordDecl const*, llvm::Value*>, 8u>&) CGExpr.cpp:0:0
> #11 0x0000558536dcd581 getGEPIndicesToField(clang::CodeGen::CodeGenFunction&, clang::RecordDecl const*, clang::FieldDecl const*, llvm::SmallVector<std::pair<clang::RecordDecl const*, llvm::Value*>, 8u>&) CGExpr.cpp:0:0
> #12 0x0000558536dca542 clang::CodeGen::CodeGenFunction::EmitCountedByFieldExpr(clang::Expr const*, clang::FieldDecl const*, clang::FieldDecl const*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x59f6542)
> #13 0x0000558536fb0927 clang::CodeGen::CodeGenFunction::emitFlexibleArrayMemberSize(clang::Expr const*, unsigned int, llvm::IntegerType*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5bdc927)
> #14 0x0000558536fafdf8 clang::CodeGen::CodeGenFunction::emitBuiltinObjectSize(clang::Expr const*, unsigned int, llvm::IntegerType*, llvm::Value*, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5bdbdf8)
> #15 0x0000558536fb9cfc clang::CodeGen::CodeGenFunction::EmitBuiltinExpr(clang::GlobalDecl, unsigned int, clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5be5cfc)
> #16 0x0000558536de827c clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a1427c)
> #17 0x0000558536e024cb (anonymous namespace)::ScalarExprEmitter::VisitCallExpr(clang::CallExpr const*) CGExprScalar.cpp:0:0
> #18 0x0000558536dee27b (anonymous namespace)::ScalarExprEmitter::Visit(clang::Expr*) CGExprScalar.cpp:0:0
> #19 0x0000558536e0bedd (anonymous namespace)::ScalarExprEmitter::VisitCastExpr(clang::CastExpr*) CGExprScalar.cpp:0:0
> #20 0x0000558536dee11c clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a1a11c)
> #21 0x0000558536e301e4 clang::CodeGen::CodeGenFunction::EmitScalarInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a5c1e4)
> #22 0x0000558536e335d1 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a5f5d1)
> #23 0x0000558536e2da7d clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a59a7d)
> #24 0x0000558536e2d4b7 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5a594b7)
> #25 0x0000558536d66ddb clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5992ddb)
> #26 0x0000558536d59acb clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5985acb)
> #27 0x0000558536d58b33 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5984b33)
> #28 0x0000558536d59aa1 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5985aa1)
> #29 0x0000558536d58b33 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5984b33)
> #30 0x0000558536d67f40 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5993f40)
> #31 0x0000558536d44ee6 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5970ee6)
> #32 0x0000558536bfb47b clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x582747b)
> #33 0x0000558536bf2a75 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x581ea75)
> #34 0x0000558536bf7a1a clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5823a1a)
> #35 0x0000558536bf13e2 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x581d3e2)
> #36 0x0000558537240fbc (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
> #37 0x0000558537237057 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x5e63057)
> #38 0x00005585386c199a clang::ParseAST(clang::Sema&, bool, bool) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x72ed99a)
> #39 0x00005585376ca08d clang::FrontendAction::Execute() (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x62f608d)
> #40 0x000055853762e7ad clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x625a7ad)
> #41 0x00005585377a673c clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x63d273c)
> #42 0x0000558534a3220a cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x365e20a)
> #43 0x0000558534a2e85d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
> #44 0x0000558537454199 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_0>(long) Job.cpp:0:0
> #45 0x00005585369510e6 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x557d0e6)
> #46 0x0000558537453833 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x607f833)
> #47 0x000055853740b427 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x6037427)
> #48 0x000055853740b987 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x6037987)
> #49 0x000055853742e0e9 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x605a0e9)
> #50 0x0000558534a2dcfd clang_main(int, char**, llvm::ToolContext const&) (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x3659cfd)
> #51 0x0000558534a3f806 main (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x366b806)
> #52 0x00007f3d209a6c88 (/usr/lib/libc.so.6+0x25c88)
> #53 0x00007f3d209a6d4c __libc_start_main (/usr/lib/libc.so.6+0x25d4c)
> #54 0x0000558534a2c125 _start (/home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin/clang-19+0x3658125)
> clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
> ClangBuiltLinux clang version 19.0.0git (https://github.com/llvm/llvm-project.git 1f6f97e)
> Target: x86_64-pc-linux-gnu
> Thread model: posix
> InstalledDir: /home/nathan/tmp/cvise.YrEYUS5WBZ/install/llvm-bad/bin
> Build config: +assertions
> clang: note: diagnostic msg: Error generating preprocessed source(s) - no preprocessable inputs.
>
> —
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> <#99574 (comment)>,
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|
|
Empty fields sometimes don't have a corresponding LLVM field number, in order to make the layout work correctly. We slightly extended the cases where this applies recently; see #96422. |
|
So is it enough to test if the FieldDecl exists in the CGRecordLayout before asking for the FieldNo? When I do that, there are some other subtle changes that occur, though maybe those are from other changes... |
|
If a field doesn't correspond to an LLVM field, it has to be empty. Which should mean it's irrelevant to this calculation, I think. |
|
That was my thinking too. I'll send a PR for people to gaze at. I'm concerned about some of the changes to the test (technically, there should be none, but I've seen this happen before). |
bwendling
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Jul 23, 2024
A FieldDecl that's an empty struct may not show up in CGRecordLayout. Go ahead and ignore such a field as it shouldn't make a difference to these calculations. Fixes: 1f6f97e ("[Clang] Loop over FieldDecls instead of all Decls (llvm#99574)")
sgundapa
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that referenced
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Jul 23, 2024
Only FieldDecls are important when determining GEP indices. A struct defined within another struct has the same semantics as if it were defined outside of the struct. So there's no need to look into RecordDecls that aren't a field. See commit 5bcf31e ("[Clang] Loop over FieldDecls instead of all Decls (llvm#89453)") Fixes 2039.
sgundapa
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to sgundapa/upstream_effort
that referenced
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Jul 23, 2024
…m#100040) A FieldDecl that's an empty struct may not show up in CGRecordLayout. Go ahead and ignore such a field as it shouldn't make a difference to these calculations. Fixes: 1f6f97e ("[Clang] Loop over FieldDecls instead of all Decls (llvm#99574)") Co-authored-by: Eli Friedman <efriedma@quicinc.com>
yuxuanchen1997
pushed a commit
that referenced
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Jul 25, 2024
Summary: Only FieldDecls are important when determining GEP indices. A struct defined within another struct has the same semantics as if it were defined outside of the struct. So there's no need to look into RecordDecls that aren't a field. See commit 5bcf31e ("[Clang] Loop over FieldDecls instead of all Decls (#89453)") Fixes 2039. Test Plan: Reviewers: Subscribers: Tasks: Tags: Differential Revision: https://phabricator.intern.facebook.com/D60250945
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Only FieldDecls are important when determining GEP indices. A struct defined within another struct has the same semantics as if it were defined outside of the struct. So there's no need to look into RecordDecls that aren't a field.
See commit 5bcf31e ("[Clang] Loop over FieldDecls instead of all Decls (#89453)")
Fixes 2039.