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Reapply^2 "[HWASan] remove incorrectly inferred attributes" (llvm#106622
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This reverts commit 66927fb.

Filter functions this applies to, which I initially wanted to do in a
follow up to make reverts easier, but turns out without that it gets
really slow

Fleetbench proto: no significant movement
Fleetbench hashing: no significant movement
Fleetbench libc: no significant movement

2nd stage LLVM build: https://lab.llvm.org/buildbot/#/builders/55/builds/1765/steps/9/logs/stdio
after this change: 80833.56user 3303.04system
previous build: 78430.21user 3258.04system

Pull Request: llvm#106816
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@fmayer
fmayer committed Sep 4, 2024
1 parent 0628683 commit 90ef80c
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Showing 6 changed files with 394 additions and 357 deletions.
43 changes: 35 additions & 8 deletions llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -598,6 +598,41 @@ void HWAddressSanitizer::initializeModule() {
LLVM_DEBUG(dbgs() << "Init " << M.getName() << "\n");
TargetTriple = Triple(M.getTargetTriple());

for (auto &F : M.functions()) {
// Remove memory attributes that are invalid with HWASan.
// HWASan checks read from shadow, which invalidates memory(argmem: *)
// Short granule checks on function arguments read from the argument memory
// (last byte of the granule), which invalidates writeonly.
//
// This is not only true for sanitized functions, because AttrInfer can
// infer those attributes on libc functions, which is not true if those
// are instrumented (Android) or intercepted.

// The API is weird. `onlyReadsMemory` actually means "does not write", and
// `onlyWritesMemory` actually means "does not read". So we reconstruct
// "accesses memory" && "does not read" <=> "writes".
bool Changed = false;
if (!F.doesNotAccessMemory()) {
bool WritesMemory = !F.onlyReadsMemory();
bool ReadsMemory = !F.onlyWritesMemory();
if ((WritesMemory && !ReadsMemory) || F.onlyAccessesArgMemory()) {
F.removeFnAttr(Attribute::Memory);
Changed = true;
}
}
for (Argument &A : F.args()) {
if (A.hasAttribute(Attribute::WriteOnly)) {
Changed = true;
A.removeAttr(Attribute::WriteOnly);
}
}
if (Changed) {
// nobuiltin makes sure later passes don't restore assumptions about
// the function.
F.addFnAttr(Attribute::NoBuiltin);
}
}

// x86_64 currently has two modes:
// - Intel LAM (default)
// - pointer aliasing (heap only)
Expand Down Expand Up @@ -1622,14 +1657,6 @@ void HWAddressSanitizer::sanitizeFunction(Function &F,

assert(!ShadowBase);

// Remove memory attributes that are about to become invalid.
// HWASan checks read from shadow, which invalidates memory(argmem: *)
// Short granule checks on function arguments read from the argument memory
// (last byte of the granule), which invalidates writeonly.
F.removeFnAttr(llvm::Attribute::Memory);
for (auto &A : F.args())
A.removeAttr(llvm::Attribute::WriteOnly);

BasicBlock::iterator InsertPt = F.getEntryBlock().begin();
IRBuilder<> EntryIRB(&F.getEntryBlock(), InsertPt);
emitPrologue(EntryIRB,
Expand Down
138 changes: 70 additions & 68 deletions llvm/test/Instrumentation/HWAddressSanitizer/RISCV/alloca.ll
View file
Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@ declare void @use32(ptr)
;.
define void @test_alloca() sanitize_hwaddress !dbg !15 {
; DYNAMIC-SHADOW-LABEL: define void @test_alloca
; DYNAMIC-SHADOW-SAME: () #[[ATTR0:[0-9]+]] personality ptr @__hwasan_personality_thunk !dbg [[DBG7:![0-9]+]] {
; DYNAMIC-SHADOW-SAME: () #[[ATTR0:[0-9]+]] personality ptr @__hwasan_personality_thunk !dbg [[DBG8:![0-9]+]] {
; DYNAMIC-SHADOW-NEXT: entry:
; DYNAMIC-SHADOW-NEXT: [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr @__hwasan_shadow)
; DYNAMIC-SHADOW-NEXT: [[TMP0:%.*]] = call ptr @llvm.frameaddress.p0(i32 0)
Expand All @@ -42,33 +42,33 @@ define void @test_alloca() sanitize_hwaddress !dbg !15 {
; DYNAMIC-SHADOW-NEXT: [[HWASAN_STACK_BASE_TAG:%.*]] = xor i64 [[TMP1]], [[TMP2]]
; DYNAMIC-SHADOW-NEXT: [[HWASAN_UAR_TAG:%.*]] = lshr i64 [[TMP1]], 56
; DYNAMIC-SHADOW-NEXT: [[X:%.*]] = alloca { i32, [12 x i8] }, align 16
; DYNAMIC-SHADOW-NEXT: #dbg_value(!DIArgList(ptr [[X]], ptr [[X]]), [[META10:![0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_tag_offset, 0, DW_OP_LLVM_arg, 1, DW_OP_LLVM_tag_offset, 0, DW_OP_plus, DW_OP_deref), [[META12:![0-9]+]])
; DYNAMIC-SHADOW-NEXT: [[TMP3:%.*]] = xor i64 [[HWASAN_STACK_BASE_TAG]], 0, !dbg [[DBG13:![0-9]+]]
; DYNAMIC-SHADOW-NEXT: [[TMP4:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP5:%.*]] = and i64 [[TMP4]], 72057594037927935, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP6:%.*]] = shl i64 [[TMP3]], 56, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP7:%.*]] = or i64 [[TMP5]], [[TMP6]], !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[X_HWASAN:%.*]] = inttoptr i64 [[TMP7]] to ptr, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP8:%.*]] = trunc i64 [[TMP3]] to i8, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP9:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP10:%.*]] = and i64 [[TMP9]], 72057594037927935, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP11:%.*]] = lshr i64 [[TMP10]], 4, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP12:%.*]] = getelementptr i8, ptr [[DOTHWASAN_SHADOW]], i64 [[TMP11]], !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP13:%.*]] = getelementptr i8, ptr [[TMP12]], i32 0, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: store i8 4, ptr [[TMP13]], align 1, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP14:%.*]] = getelementptr i8, ptr [[X]], i32 15, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: store i8 [[TMP8]], ptr [[TMP14]], align 1, !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: call void @use32(ptr nonnull [[X_HWASAN]]), !dbg [[DBG13]]
; DYNAMIC-SHADOW-NEXT: [[TMP15:%.*]] = trunc i64 [[HWASAN_UAR_TAG]] to i8, !dbg [[DBG14:![0-9]+]]
; DYNAMIC-SHADOW-NEXT: [[TMP16:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP17:%.*]] = and i64 [[TMP16]], 72057594037927935, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP18:%.*]] = lshr i64 [[TMP17]], 4, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP19:%.*]] = getelementptr i8, ptr [[DOTHWASAN_SHADOW]], i64 [[TMP18]], !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP19]], i8 [[TMP15]], i64 1, i1 false), !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: ret void, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: #dbg_value(!DIArgList(ptr [[X]], ptr [[X]]), [[META11:![0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_tag_offset, 0, DW_OP_LLVM_arg, 1, DW_OP_LLVM_tag_offset, 0, DW_OP_plus, DW_OP_deref), [[META13:![0-9]+]])
; DYNAMIC-SHADOW-NEXT: [[TMP3:%.*]] = xor i64 [[HWASAN_STACK_BASE_TAG]], 0, !dbg [[DBG14:![0-9]+]]
; DYNAMIC-SHADOW-NEXT: [[TMP4:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP5:%.*]] = and i64 [[TMP4]], 72057594037927935, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP6:%.*]] = shl i64 [[TMP3]], 56, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP7:%.*]] = or i64 [[TMP5]], [[TMP6]], !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[X_HWASAN:%.*]] = inttoptr i64 [[TMP7]] to ptr, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP8:%.*]] = trunc i64 [[TMP3]] to i8, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP9:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP10:%.*]] = and i64 [[TMP9]], 72057594037927935, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP11:%.*]] = lshr i64 [[TMP10]], 4, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP12:%.*]] = getelementptr i8, ptr [[DOTHWASAN_SHADOW]], i64 [[TMP11]], !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP13:%.*]] = getelementptr i8, ptr [[TMP12]], i32 0, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: store i8 4, ptr [[TMP13]], align 1, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP14:%.*]] = getelementptr i8, ptr [[X]], i32 15, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: store i8 [[TMP8]], ptr [[TMP14]], align 1, !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: call void @use32(ptr nonnull [[X_HWASAN]]), !dbg [[DBG14]]
; DYNAMIC-SHADOW-NEXT: [[TMP15:%.*]] = trunc i64 [[HWASAN_UAR_TAG]] to i8, !dbg [[DBG15:![0-9]+]]
; DYNAMIC-SHADOW-NEXT: [[TMP16:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG15]]
; DYNAMIC-SHADOW-NEXT: [[TMP17:%.*]] = and i64 [[TMP16]], 72057594037927935, !dbg [[DBG15]]
; DYNAMIC-SHADOW-NEXT: [[TMP18:%.*]] = lshr i64 [[TMP17]], 4, !dbg [[DBG15]]
; DYNAMIC-SHADOW-NEXT: [[TMP19:%.*]] = getelementptr i8, ptr [[DOTHWASAN_SHADOW]], i64 [[TMP18]], !dbg [[DBG15]]
; DYNAMIC-SHADOW-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP19]], i8 [[TMP15]], i64 1, i1 false), !dbg [[DBG15]]
; DYNAMIC-SHADOW-NEXT: ret void, !dbg [[DBG15]]
;
; ZERO-BASED-SHADOW-LABEL: define void @test_alloca
; ZERO-BASED-SHADOW-SAME: () #[[ATTR0:[0-9]+]] personality ptr @__hwasan_personality_thunk !dbg [[DBG7:![0-9]+]] {
; ZERO-BASED-SHADOW-SAME: () #[[ATTR0:[0-9]+]] personality ptr @__hwasan_personality_thunk !dbg [[DBG8:![0-9]+]] {
; ZERO-BASED-SHADOW-NEXT: entry:
; ZERO-BASED-SHADOW-NEXT: [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
; ZERO-BASED-SHADOW-NEXT: [[TMP0:%.*]] = call ptr @llvm.frameaddress.p0(i32 0)
Expand All @@ -77,30 +77,30 @@ define void @test_alloca() sanitize_hwaddress !dbg !15 {
; ZERO-BASED-SHADOW-NEXT: [[HWASAN_STACK_BASE_TAG:%.*]] = xor i64 [[TMP1]], [[TMP2]]
; ZERO-BASED-SHADOW-NEXT: [[HWASAN_UAR_TAG:%.*]] = lshr i64 [[TMP1]], 56
; ZERO-BASED-SHADOW-NEXT: [[X:%.*]] = alloca { i32, [12 x i8] }, align 16
; ZERO-BASED-SHADOW-NEXT: #dbg_value(!DIArgList(ptr [[X]], ptr [[X]]), [[META10:![0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_tag_offset, 0, DW_OP_LLVM_arg, 1, DW_OP_LLVM_tag_offset, 0, DW_OP_plus, DW_OP_deref), [[META12:![0-9]+]])
; ZERO-BASED-SHADOW-NEXT: [[TMP3:%.*]] = xor i64 [[HWASAN_STACK_BASE_TAG]], 0, !dbg [[DBG13:![0-9]+]]
; ZERO-BASED-SHADOW-NEXT: [[TMP4:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP5:%.*]] = and i64 [[TMP4]], 72057594037927935, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP6:%.*]] = shl i64 [[TMP3]], 56, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP7:%.*]] = or i64 [[TMP5]], [[TMP6]], !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[X_HWASAN:%.*]] = inttoptr i64 [[TMP7]] to ptr, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP8:%.*]] = trunc i64 [[TMP3]] to i8, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP9:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP10:%.*]] = and i64 [[TMP9]], 72057594037927935, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP11:%.*]] = lshr i64 [[TMP10]], 4, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP12:%.*]] = inttoptr i64 [[TMP11]] to ptr, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP13:%.*]] = getelementptr i8, ptr [[TMP12]], i32 0, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: store i8 4, ptr [[TMP13]], align 1, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP14:%.*]] = getelementptr i8, ptr [[X]], i32 15, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: store i8 [[TMP8]], ptr [[TMP14]], align 1, !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: call void @use32(ptr nonnull [[X_HWASAN]]), !dbg [[DBG13]]
; ZERO-BASED-SHADOW-NEXT: [[TMP15:%.*]] = trunc i64 [[HWASAN_UAR_TAG]] to i8, !dbg [[DBG14:![0-9]+]]
; ZERO-BASED-SHADOW-NEXT: [[TMP16:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP17:%.*]] = and i64 [[TMP16]], 72057594037927935, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP18:%.*]] = lshr i64 [[TMP17]], 4, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP19:%.*]] = inttoptr i64 [[TMP18]] to ptr, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP19]], i8 [[TMP15]], i64 1, i1 false), !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: ret void, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: #dbg_value(!DIArgList(ptr [[X]], ptr [[X]]), [[META11:![0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_tag_offset, 0, DW_OP_LLVM_arg, 1, DW_OP_LLVM_tag_offset, 0, DW_OP_plus, DW_OP_deref), [[META13:![0-9]+]])
; ZERO-BASED-SHADOW-NEXT: [[TMP3:%.*]] = xor i64 [[HWASAN_STACK_BASE_TAG]], 0, !dbg [[DBG14:![0-9]+]]
; ZERO-BASED-SHADOW-NEXT: [[TMP4:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP5:%.*]] = and i64 [[TMP4]], 72057594037927935, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP6:%.*]] = shl i64 [[TMP3]], 56, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP7:%.*]] = or i64 [[TMP5]], [[TMP6]], !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[X_HWASAN:%.*]] = inttoptr i64 [[TMP7]] to ptr, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP8:%.*]] = trunc i64 [[TMP3]] to i8, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP9:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP10:%.*]] = and i64 [[TMP9]], 72057594037927935, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP11:%.*]] = lshr i64 [[TMP10]], 4, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP12:%.*]] = inttoptr i64 [[TMP11]] to ptr, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP13:%.*]] = getelementptr i8, ptr [[TMP12]], i32 0, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: store i8 4, ptr [[TMP13]], align 1, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP14:%.*]] = getelementptr i8, ptr [[X]], i32 15, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: store i8 [[TMP8]], ptr [[TMP14]], align 1, !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: call void @use32(ptr nonnull [[X_HWASAN]]), !dbg [[DBG14]]
; ZERO-BASED-SHADOW-NEXT: [[TMP15:%.*]] = trunc i64 [[HWASAN_UAR_TAG]] to i8, !dbg [[DBG15:![0-9]+]]
; ZERO-BASED-SHADOW-NEXT: [[TMP16:%.*]] = ptrtoint ptr [[X]] to i64, !dbg [[DBG15]]
; ZERO-BASED-SHADOW-NEXT: [[TMP17:%.*]] = and i64 [[TMP16]], 72057594037927935, !dbg [[DBG15]]
; ZERO-BASED-SHADOW-NEXT: [[TMP18:%.*]] = lshr i64 [[TMP17]], 4, !dbg [[DBG15]]
; ZERO-BASED-SHADOW-NEXT: [[TMP19:%.*]] = inttoptr i64 [[TMP18]] to ptr, !dbg [[DBG15]]
; ZERO-BASED-SHADOW-NEXT: call void @llvm.memset.p0.i64(ptr align 1 [[TMP19]], i8 [[TMP15]], i64 1, i1 false), !dbg [[DBG15]]
; ZERO-BASED-SHADOW-NEXT: ret void, !dbg [[DBG15]]
;
entry:
%x = alloca i32, align 4
Expand Down Expand Up @@ -147,29 +147,31 @@ declare void @llvm.dbg.value(metadata, metadata, metadata)
; DYNAMIC-SHADOW: [[META3]] = !{}
; DYNAMIC-SHADOW: [[META4:![0-9]+]] = !{i32 7, !"Dwarf Version", i32 4}
; DYNAMIC-SHADOW: [[META5:![0-9]+]] = !{i32 2, !"Debug Info Version", i32 3}
; DYNAMIC-SHADOW: [[META6:![0-9]+]] = !{!"{{.*}}clang version {{.*}}"}
; DYNAMIC-SHADOW: [[DBG7]] = distinct !DISubprogram(name: "test_alloca", linkageName: "_Z11test_allocav", scope: [[META2]], file: [[META2]], line: 4, type: [[META8:![0-9]+]], scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: [[META1]], retainedNodes: [[META3]])
; DYNAMIC-SHADOW: [[META8]] = !DISubroutineType(types: [[META9:![0-9]+]])
; DYNAMIC-SHADOW: [[META9]] = !{null}
; DYNAMIC-SHADOW: [[META10]] = !DILocalVariable(name: "x", scope: [[DBG7]], file: [[META2]], line: 5, type: [[META11:![0-9]+]])
; DYNAMIC-SHADOW: [[META11]] = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
; DYNAMIC-SHADOW: [[META12]] = !DILocation(line: 0, scope: [[DBG7]])
; DYNAMIC-SHADOW: [[DBG13]] = !DILocation(line: 7, column: 5, scope: [[DBG7]])
; DYNAMIC-SHADOW: [[DBG14]] = !DILocation(line: 8, column: 1, scope: [[DBG7]])
; DYNAMIC-SHADOW: [[META6:![0-9]+]] = !{i32 4, !"nosanitize_hwaddress", i32 1}
; DYNAMIC-SHADOW: [[META7:![0-9]+]] = !{!"{{.*}}clang version {{.*}}"}
; DYNAMIC-SHADOW: [[DBG8]] = distinct !DISubprogram(name: "test_alloca", linkageName: "_Z11test_allocav", scope: [[META2]], file: [[META2]], line: 4, type: [[META9:![0-9]+]], scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: [[META1]], retainedNodes: [[META3]])
; DYNAMIC-SHADOW: [[META9]] = !DISubroutineType(types: [[META10:![0-9]+]])
; DYNAMIC-SHADOW: [[META10]] = !{null}
; DYNAMIC-SHADOW: [[META11]] = !DILocalVariable(name: "x", scope: [[DBG8]], file: [[META2]], line: 5, type: [[META12:![0-9]+]])
; DYNAMIC-SHADOW: [[META12]] = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
; DYNAMIC-SHADOW: [[META13]] = !DILocation(line: 0, scope: [[DBG8]])
; DYNAMIC-SHADOW: [[DBG14]] = !DILocation(line: 7, column: 5, scope: [[DBG8]])
; DYNAMIC-SHADOW: [[DBG15]] = !DILocation(line: 8, column: 1, scope: [[DBG8]])
;.
; ZERO-BASED-SHADOW: [[META0]] = !{ptr @hwasan.note}
; ZERO-BASED-SHADOW: [[META1:![0-9]+]] = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: [[META2:![0-9]+]], producer: "{{.*}}clang version {{.*}}", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: [[META3:![0-9]+]], splitDebugInlining: false, nameTableKind: None)
; ZERO-BASED-SHADOW: [[META2]] = !DIFile(filename: "alloca.cpp", directory: {{.*}})
; ZERO-BASED-SHADOW: [[META3]] = !{}
; ZERO-BASED-SHADOW: [[META4:![0-9]+]] = !{i32 7, !"Dwarf Version", i32 4}
; ZERO-BASED-SHADOW: [[META5:![0-9]+]] = !{i32 2, !"Debug Info Version", i32 3}
; ZERO-BASED-SHADOW: [[META6:![0-9]+]] = !{!"{{.*}}clang version {{.*}}"}
; ZERO-BASED-SHADOW: [[DBG7]] = distinct !DISubprogram(name: "test_alloca", linkageName: "_Z11test_allocav", scope: [[META2]], file: [[META2]], line: 4, type: [[META8:![0-9]+]], scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: [[META1]], retainedNodes: [[META3]])
; ZERO-BASED-SHADOW: [[META8]] = !DISubroutineType(types: [[META9:![0-9]+]])
; ZERO-BASED-SHADOW: [[META9]] = !{null}
; ZERO-BASED-SHADOW: [[META10]] = !DILocalVariable(name: "x", scope: [[DBG7]], file: [[META2]], line: 5, type: [[META11:![0-9]+]])
; ZERO-BASED-SHADOW: [[META11]] = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
; ZERO-BASED-SHADOW: [[META12]] = !DILocation(line: 0, scope: [[DBG7]])
; ZERO-BASED-SHADOW: [[DBG13]] = !DILocation(line: 7, column: 5, scope: [[DBG7]])
; ZERO-BASED-SHADOW: [[DBG14]] = !DILocation(line: 8, column: 1, scope: [[DBG7]])
; ZERO-BASED-SHADOW: [[META6:![0-9]+]] = !{i32 4, !"nosanitize_hwaddress", i32 1}
; ZERO-BASED-SHADOW: [[META7:![0-9]+]] = !{!"{{.*}}clang version {{.*}}"}
; ZERO-BASED-SHADOW: [[DBG8]] = distinct !DISubprogram(name: "test_alloca", linkageName: "_Z11test_allocav", scope: [[META2]], file: [[META2]], line: 4, type: [[META9:![0-9]+]], scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: [[META1]], retainedNodes: [[META3]])
; ZERO-BASED-SHADOW: [[META9]] = !DISubroutineType(types: [[META10:![0-9]+]])
; ZERO-BASED-SHADOW: [[META10]] = !{null}
; ZERO-BASED-SHADOW: [[META11]] = !DILocalVariable(name: "x", scope: [[DBG8]], file: [[META2]], line: 5, type: [[META12:![0-9]+]])
; ZERO-BASED-SHADOW: [[META12]] = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
; ZERO-BASED-SHADOW: [[META13]] = !DILocation(line: 0, scope: [[DBG8]])
; ZERO-BASED-SHADOW: [[DBG14]] = !DILocation(line: 7, column: 5, scope: [[DBG8]])
; ZERO-BASED-SHADOW: [[DBG15]] = !DILocation(line: 8, column: 1, scope: [[DBG8]])
;.
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