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Apr 4, 2025
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[Verifier] Require that dbg.declare variable is a ptr #134355

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[Verifier] Require that dbg.declare variable is a ptr
nikic Apr 3, 2025
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Address review feedback
nikic Apr 4, 2025
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8 changes: 4 additions & 4 deletions llvm/docs/SourceLevelDebugging.rst
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Expand Up @@ -208,10 +208,10 @@ comma-separated arguments in parentheses, as with a `call`.
#dbg_declare([Value|MDNode], DILocalVariable, DIExpression, DILocation)

This record provides information about a local element (e.g., variable).
The first argument is an SSA value corresponding to a variable address, and is
typically a static alloca in the function entry block. The second argument is a
`local variable <LangRef.html#dilocalvariable>`_ containing a description of
the variable. The third argument is a `complex expression
The first argument is an SSA ``ptr`` value corresponding to a variable address,
and is typically a static alloca in the function entry block. The second
argument is a `local variable <LangRef.html#dilocalvariable>`_ containing a
description of the variable. The third argument is a `complex expression
<LangRef.html#diexpression>`_. The fourth argument is a `source location
<LangRef.html#dilocation>`_. A ``#dbg_declare`` record describes the
*address* of a source variable.
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8 changes: 6 additions & 2 deletions llvm/lib/IR/Verifier.cpp
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Expand Up @@ -6666,10 +6666,14 @@ void Verifier::visit(DbgVariableRecord &DVR) {
CheckDI(MD && (isa<ValueAsMetadata>(MD) || isa<DIArgList>(MD) ||
(isa<MDNode>(MD) && !cast<MDNode>(MD)->getNumOperands())),
"invalid #dbg record address/value", &DVR, MD);
if (auto *VAM = dyn_cast<ValueAsMetadata>(MD))
if (auto *VAM = dyn_cast<ValueAsMetadata>(MD)) {
visitValueAsMetadata(*VAM, F);
else if (auto *AL = dyn_cast<DIArgList>(MD))
if (DVR.isDbgDeclare())
CheckDI(VAM->getValue()->getType()->isPointerTy(),
"location of #dbg_declare must be a pointer", &DVR, MD);
} else if (auto *AL = dyn_cast<DIArgList>(MD)) {
visitDIArgList(*AL, F);
}

CheckDI(isa_and_nonnull<DILocalVariable>(DVR.getRawVariable()),
"invalid #dbg record variable", &DVR, DVR.getRawVariable());
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4 changes: 2 additions & 2 deletions llvm/test/CodeGen/AArch64/fast-isel-dbg.ll
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Expand Up @@ -6,8 +6,8 @@ target triple="aarch64--"

; CHECK-LABEL: name: func
; CHECK: DBG_VALUE
define void @func(i32 %a) !dbg !4 {
call void @llvm.dbg.declare(metadata i32 %a, metadata !5, metadata !DIExpression()), !dbg !7
define void @func(ptr %a) !dbg !4 {
call void @llvm.dbg.declare(metadata ptr %a, metadata !5, metadata !DIExpression()), !dbg !7
ret void
}

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4 changes: 2 additions & 2 deletions llvm/test/CodeGen/AArch64/selectiondag-order.ll
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Expand Up @@ -53,10 +53,10 @@ end: ; preds = %body
; AARCH64-CHECK: BB1_1:


define i64 @simulateWithDbgDeclare(<2 x i32> %a) local_unnamed_addr {
define i64 @simulateWithDbgDeclare(<2 x i32> %a, ptr %ptr) local_unnamed_addr {
entry:
%rand = tail call i64 @lrand48() #3
tail call void @llvm.dbg.declare(metadata i64 %rand, metadata !6, metadata !7), !dbg !8
tail call void @llvm.dbg.declare(metadata ptr %ptr, metadata !6, metadata !7), !dbg !8
br label %body

body: ; preds = %body, %entry
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2 changes: 1 addition & 1 deletion llvm/test/CodeGen/MIR/X86/diexpr-win32.mir
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Expand Up @@ -82,7 +82,7 @@
entry:
%0 = bitcast ptr %s to ptr
%bytes = load i32, ptr %0, !dbg !34
call void @llvm.dbg.declare(metadata i32 %bytes, metadata !35, metadata !28), !dbg !34
call void @llvm.dbg.value(metadata i32 %bytes, metadata !35, metadata !28), !dbg !34
%1 = add i32 %bytes, %acc, !dbg !36
ret i32 %1, !dbg !36
}
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4 changes: 2 additions & 2 deletions llvm/test/CodeGen/X86/selectiondag-order.ll
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Expand Up @@ -53,10 +53,10 @@ end: ; preds = %body
; X86-CHECK: callq lrand48
; X86-CHECK: movq %rax, %rbx

define i64 @simulateWithDbgDeclare(<2 x i32> %a) local_unnamed_addr {
define i64 @simulateWithDbgDeclare(<2 x i32> %a, ptr %ptr) local_unnamed_addr {
entry:
%rand = tail call i64 @lrand48() #3
tail call void @llvm.dbg.declare(metadata i64 %rand, metadata !6, metadata !7), !dbg !8
tail call void @llvm.dbg.declare(metadata ptr %ptr, metadata !6, metadata !7), !dbg !8
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@OCHyams OCHyams Apr 4, 2025 •
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I think this slightly changes the tested behaviour, because the new dbg.declare will get put in the MF side-table:

https://godbolt.org/z/bh6oEM55G

The old dbg.declare causes a DBG_INSTR_REF, whereas the new on gets stuffed into stack:. I think this may be the case in a couple of other tests too. If you make %ptr an argument instead of a local alloca it looks like a DBG_VALUE is generated, which is closer to the output of the original test.

Since the test isn't checking for the debug instruction in the output, maybe it doesn't matter, but I'd personally err on the side of minimising the change in output. YMMV.

br label %body

body: ; preds = %body, %entry
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4 changes: 2 additions & 2 deletions llvm/test/DebugInfo/ARM/lowerbdgdeclare_vla.ll
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Expand Up @@ -19,9 +19,9 @@ target triple = "thumbv7-apple-ios8.0.0"
; Function Attrs: nounwind optsize readnone
define void @run(float %r) #0 !dbg !4 {
entry:
tail call void @llvm.dbg.declare(metadata float %r, metadata !11, metadata !DIExpression()), !dbg !22
tail call void @llvm.dbg.value(metadata float %r, metadata !11, metadata !DIExpression()), !dbg !22
%conv = fptosi float %r to i32, !dbg !23
tail call void @llvm.dbg.declare(metadata i32 %conv, metadata !12, metadata !DIExpression()), !dbg !23
tail call void @llvm.dbg.value(metadata i32 %conv, metadata !12, metadata !DIExpression()), !dbg !23
%vla = alloca float, i32 %conv, align 4, !dbg !24
tail call void @llvm.dbg.declare(metadata ptr %vla, metadata !14, metadata !DIExpression(DW_OP_deref)), !dbg !24
; The VLA alloca should be described by a dbg.declare:
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18 changes: 9 additions & 9 deletions llvm/test/Transforms/Coroutines/coro-debug.ll
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Expand Up @@ -29,8 +29,8 @@ sw.bb: ; preds = %entry
%direct = load i32, ptr %x.addr, align 4, !dbg !14
%gep = getelementptr inbounds [16 x i8], ptr undef, i32 %direct, !dbg !14
call void @llvm.dbg.declare(metadata ptr %gep, metadata !27, metadata !13), !dbg !14
call void @llvm.dbg.declare(metadata i32 %conv, metadata !26, metadata !13), !dbg !14
call void @llvm.dbg.declare(metadata i32 %direct, metadata !25, metadata !13), !dbg !14
call void @llvm.dbg.value(metadata i32 %conv, metadata !26, metadata !13), !dbg !14
call void @llvm.dbg.value(metadata i32 %direct, metadata !25, metadata !13), !dbg !14
call void @llvm.dbg.declare(metadata ptr %x.addr, metadata !12, metadata !13), !dbg !14
call void @llvm.dbg.declare(metadata ptr %coro_hdl, metadata !15, metadata !13), !dbg !16
call void @llvm.dbg.declare(metadata ptr %late_local, metadata !29, metadata !13), !dbg !16
Expand Down Expand Up @@ -66,7 +66,7 @@ coro_Cleanup: ; preds = %sw.epilog, %sw.bb1
%5 = load ptr, ptr %coro_hdl, align 8, !dbg !24
%6 = call ptr @llvm.coro.free(token %0, ptr %5), !dbg !24
call void @free(ptr %6), !dbg !24
call void @llvm.dbg.declare(metadata i32 %asm_res, metadata !32, metadata !13), !dbg !16
call void @llvm.dbg.value(metadata i32 %asm_res, metadata !32, metadata !13), !dbg !16
br label %coro_Suspend, !dbg !24

coro_Suspend: ; preds = %coro_Cleanup, %sw.default
Expand Down Expand Up @@ -176,14 +176,14 @@ attributes #7 = { noduplicate }
; CHECK: %[[DBG_PTR:.*]] = alloca ptr
; CHECK: #dbg_declare(ptr %[[DBG_PTR]], ![[RESUME_COROHDL:[0-9]+]], !DIExpression(DW_OP_deref, DW_OP_plus_uconst,
; CHECK: #dbg_declare(ptr %[[DBG_PTR]], ![[RESUME_X:[0-9]+]], !DIExpression(DW_OP_deref, DW_OP_plus_uconst, [[EXPR_TAIL:.*]])
; CHECK: #dbg_declare(ptr %[[DBG_PTR]], ![[RESUME_DIRECT:[0-9]+]], !DIExpression(DW_OP_deref, DW_OP_plus_uconst, [[EXPR_TAIL]])
; CHECK: store ptr {{.*}}, ptr %[[DBG_PTR]]
; CHECK-NOT: alloca ptr
; CHECK: #dbg_declare(i8 0, ![[RESUME_CONST:[0-9]+]], !DIExpression(DW_OP_LLVM_convert, 8, DW_ATE_signed, DW_OP_LLVM_convert, 32, DW_ATE_signed),
; CHECK: call void @coro.devirt.trigger(ptr null)
; CHECK: #dbg_value(i8 0, ![[RESUME_CONST:[0-9]+]], !DIExpression(DW_OP_LLVM_convert, 8, DW_ATE_signed, DW_OP_LLVM_convert, 32, DW_ATE_signed),
; CHECK: #dbg_value(ptr %[[DBG_PTR]], ![[RESUME_DIRECT:[0-9]+]], !DIExpression(DW_OP_deref, DW_OP_plus_uconst, {{[0-9]+}}, DW_OP_deref),
; Note that keeping the undef value here could be acceptable, too.
; CHECK-NOT: #dbg_declare(ptr undef, !{{[0-9]+}}, !DIExpression(),
; CHECK: call void @coro.devirt.trigger(ptr null)
; CHECK: #dbg_value(ptr {{.*}}, ![[RESUME_DIRECT_VALUE:[0-9]+]], !DIExpression(DW_OP_deref, DW_OP_plus_uconst, {{[0-9]+}}, DW_OP_deref),
; CHECK: #dbg_value(ptr %[[DBG_PTR]], ![[RESUME_DIRECT_VALUE:[0-9]+]], !DIExpression(DW_OP_deref, DW_OP_plus_uconst, {{[0-9]+}}, DW_OP_deref),
; Check that the dbg.declare intrinsic of invoke instruction is hanled correctly.
; CHECK: %[[ALLOCATED_STORAGE:.+]] = invoke ptr @allocate()
; CHECK-NEXT: to label %[[NORMAL_DEST:.+]] unwind
Expand All @@ -193,7 +193,7 @@ attributes #7 = { noduplicate }
; CHECK-NEXT: to label %[[DEFAULT_DEST:.+]] [label
; CHECK: [[DEFAULT_DEST]]:
; CHECK-NOT: {{.*}}:
; CHECK: #dbg_declare(i32 %[[CALLBR_RES]]
; CHECK: #dbg_value(i32 %[[CALLBR_RES]]
; CHECK: define internal fastcc void @f.destroy(ptr noundef nonnull align 8 dereferenceable(40) %0) #0 personality i32 0 !dbg ![[DESTROY:[0-9]+]]
; CHECK: define internal fastcc void @f.cleanup(ptr noundef nonnull align 8 dereferenceable(40) %0) #0 personality i32 0 !dbg ![[CLEANUP:[0-9]+]]

Expand All @@ -202,8 +202,8 @@ attributes #7 = { noduplicate }
; CHECK: ![[RESUME]] = distinct !DISubprogram(name: "f", linkageName: "flink"
; CHECK: ![[RESUME_COROHDL]] = !DILocalVariable(name: "coro_hdl", scope: ![[RESUME]]
; CHECK: ![[RESUME_X]] = !DILocalVariable(name: "x", arg: 1, scope: ![[RESUME]]
; CHECK: ![[RESUME_DIRECT]] = !DILocalVariable(name: "direct_mem", scope: ![[RESUME]]
; CHECK: ![[RESUME_CONST]] = !DILocalVariable(name: "direct_const", scope: ![[RESUME]]
; CHECK: ![[RESUME_DIRECT]] = !DILocalVariable(name: "direct_mem", scope: ![[RESUME]]
; CHECK: ![[RESUME_DIRECT_VALUE]] = !DILocalVariable(name: "direct_value", scope: ![[RESUME]]

; CHECK: ![[DESTROY]] = distinct !DISubprogram(name: "f", linkageName: "flink"
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4 changes: 2 additions & 2 deletions llvm/test/Transforms/LoopVectorize/discriminator.ll
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Expand Up @@ -32,8 +32,8 @@ define void @_Z3foov() local_unnamed_addr #0 !dbg !6 {
%7 = load i32, ptr %6, align 4, !dbg !17, !tbaa !15
%8 = add nsw i32 %7, %5, !dbg !17
;PSEUDO_PROBE-COUNT-5: call void @llvm.pseudoprobe(i64 6699318081062747564, i64 2, i32 0, i64 -1), !dbg ![[#PROBE:]]
;DBG_VALUE: #dbg_declare{{.*}} ![[DBG:[0-9]*]]
call void @llvm.dbg.declare(metadata i32 %8, metadata !22, metadata !DIExpression()), !dbg !17
;DBG_VALUE: #dbg_value{{.*}} ![[DBG:[0-9]*]]
call void @llvm.dbg.value(metadata i32 %8, metadata !22, metadata !DIExpression()), !dbg !17
store i32 %8, ptr %6, align 4, !dbg !17, !tbaa !15
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !18
%exitcond = icmp eq i64 %indvars.iv.next, 4096, !dbg !19
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