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[CodeView] Saturate values bigger than supported by APInt.

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This fixes an assert firing when compiling code which involves 128 bit
integrals.

This would trigger runtime checks similar to this:
```
Assertion failed: getMinSignedBits() <= 64 && "Too many bits for int64_t", file llvm/include/llvm/ADT/APInt.h, line 1646
```

To get around this, we just saturate those big values.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D105320
This commit is contained in:
Matheus Izvekov 2021-07-02 00:26:17 +02:00
parent e4830a62b3
commit 33d35b0a79
7 changed files with 182 additions and 47 deletions
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10
include/llvm/ADT/APInt.h
View File

@ -109,11 +109,6 @@ private:
U.pVal = val;
}
/// Determine if this APInt just has one word to store value.
///
/// \returns true if the number of bits <= 64, false otherwise.
bool isSingleWord() const { return BitWidth <= APINT_BITS_PER_WORD; }
/// Determine which word a bit is in.
///
/// \returns the word position for the specified bit position.
@ -356,6 +351,11 @@ public:
/// \name Value Tests
/// @{
/// Determine if this APInt just has one word to store value.
///
/// \returns true if the number of bits <= 64, false otherwise.
bool isSingleWord() const { return BitWidth <= APINT_BITS_PER_WORD; }
/// Determine sign of this APInt.
///
/// This tests the high bit of this APInt to determine if it is set.

2
include/llvm/IR/DIBuilder.h
View File

@ -182,7 +182,7 @@ namespace llvm {
/// Create a single enumerator value.
DIEnumerator *createEnumerator(StringRef Name, APSInt Value);
DIEnumerator *createEnumerator(StringRef Name, int64_t Val,
DIEnumerator *createEnumerator(StringRef Name, uint64_t Val,
bool IsUnsigned = false);
/// Create a DWARF unspecified type.

60
lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
View File

@ -2116,6 +2116,7 @@ TypeIndex CodeViewDebug::lowerTypeEnum(const DICompositeType *Ty) {
// We assume that the frontend provides all members in source declaration
// order, which is what MSVC does.
if (auto *Enumerator = dyn_cast_or_null<DIEnumerator>(Element)) {
// FIXME: Is it correct to always emit these as unsigned here?
EnumeratorRecord ER(MemberAccess::Public,
APSInt(Enumerator->getValue(), true),
Enumerator->getName());
@ -3157,6 +3158,27 @@ void CodeViewDebug::emitGlobalVariableList(ArrayRef<CVGlobalVariable> Globals) {
}
}
void CodeViewDebug::emitConstantSymbolRecord(const DIType *DTy, APSInt &Value,
const std::string &QualifiedName) {
MCSymbol *SConstantEnd = beginSymbolRecord(SymbolKind::S_CONSTANT);
OS.AddComment("Type");
OS.emitInt32(getTypeIndex(DTy).getIndex());
OS.AddComment("Value");
// Encoded integers shouldn't need more than 10 bytes.
uint8_t Data[10];
BinaryStreamWriter Writer(Data, llvm::support::endianness::little);
CodeViewRecordIO IO(Writer);
cantFail(IO.mapEncodedInteger(Value));
StringRef SRef((char *)Data, Writer.getOffset());
OS.emitBinaryData(SRef);
OS.AddComment("Name");
emitNullTerminatedSymbolName(OS, QualifiedName);
endSymbolRecord(SConstantEnd);
}
void CodeViewDebug::emitStaticConstMemberList() {
for (const DIDerivedType *DTy : StaticConstMembers) {
const DIScope *Scope = DTy->getScope();
@ -3172,24 +3194,8 @@ void CodeViewDebug::emitStaticConstMemberList() {
else
llvm_unreachable("cannot emit a constant without a value");
std::string QualifiedName = getFullyQualifiedName(Scope, DTy->getName());
MCSymbol *SConstantEnd = beginSymbolRecord(SymbolKind::S_CONSTANT);
OS.AddComment("Type");
OS.emitInt32(getTypeIndex(DTy->getBaseType()).getIndex());
OS.AddComment("Value");
// Encoded integers shouldn't need more than 10 bytes.
uint8_t Data[10];
BinaryStreamWriter Writer(Data, llvm::support::endianness::little);
CodeViewRecordIO IO(Writer);
cantFail(IO.mapEncodedInteger(Value));
StringRef SRef((char *)Data, Writer.getOffset());
OS.emitBinaryData(SRef);
OS.AddComment("Name");
emitNullTerminatedSymbolName(OS, QualifiedName);
endSymbolRecord(SConstantEnd);
emitConstantSymbolRecord(DTy->getBaseType(), Value,
getFullyQualifiedName(Scope, DTy->getName()));
}
}
@ -3253,22 +3259,6 @@ void CodeViewDebug::emitDebugInfoForGlobal(const CVGlobalVariable &CVGV) {
? true
: DebugHandlerBase::isUnsignedDIType(DIGV->getType());
APSInt Value(APInt(/*BitWidth=*/64, DIE->getElement(1)), isUnsigned);
MCSymbol *SConstantEnd = beginSymbolRecord(SymbolKind::S_CONSTANT);
OS.AddComment("Type");
OS.emitInt32(getTypeIndex(DIGV->getType()).getIndex());
OS.AddComment("Value");
// Encoded integers shouldn't need more than 10 bytes.
uint8_t data[10];
BinaryStreamWriter Writer(data, llvm::support::endianness::little);
CodeViewRecordIO IO(Writer);
cantFail(IO.mapEncodedInteger(Value));
StringRef SRef((char *)data, Writer.getOffset());
OS.emitBinaryData(SRef);
OS.AddComment("Name");
emitNullTerminatedSymbolName(OS, QualifiedName);
endSymbolRecord(SConstantEnd);
emitConstantSymbolRecord(DIGV->getType(), Value, QualifiedName);
}
}

2
lib/CodeGen/AsmPrinter/CodeViewDebug.h
View File

@ -315,6 +315,8 @@ class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
void collectDebugInfoForGlobals();
void emitDebugInfoForGlobals();
void emitGlobalVariableList(ArrayRef<CVGlobalVariable> Globals);
void emitConstantSymbolRecord(const DIType *DTy, APSInt &Value,
const std::string &QualifiedName);
void emitDebugInfoForGlobal(const CVGlobalVariable &CVGV);
void emitStaticConstMemberList();

17
lib/DebugInfo/CodeView/CodeViewRecordIO.cpp
View File

@ -188,14 +188,17 @@ Error CodeViewRecordIO::mapEncodedInteger(uint64_t &Value,
Error CodeViewRecordIO::mapEncodedInteger(APSInt &Value, const Twine &Comment) {
if (isStreaming()) {
// FIXME: We also need to handle big values here, but it's
// not clear how we can excercise this code path yet.
if (Value.isSigned())
emitEncodedSignedInteger(Value.getSExtValue(), Comment);
else
emitEncodedUnsignedInteger(Value.getZExtValue(), Comment);
} else if (isWriting()) {
if (Value.isSigned())
return writeEncodedSignedInteger(Value.getSExtValue());
return writeEncodedUnsignedInteger(Value.getZExtValue());
return writeEncodedSignedInteger(
Value.isSingleWord() ? Value.getSExtValue() : INT64_MIN);
return writeEncodedUnsignedInteger(Value.getLimitedValue());
} else
return consume(*Reader, Value);
return Error::success();
@ -273,6 +276,9 @@ Error CodeViewRecordIO::mapStringZVectorZ(std::vector<StringRef> &Value,
void CodeViewRecordIO::emitEncodedSignedInteger(const int64_t &Value,
const Twine &Comment) {
// FIXME: There are no test cases covering this function.
// This may be because we always consider enumerators to be unsigned.
// See FIXME at CodeViewDebug.cpp : CodeViewDebug::lowerTypeEnum.
if (Value >= std::numeric_limits<int8_t>::min()) {
Streamer->emitIntValue(LF_CHAR, 2);
emitComment(Comment);
@ -291,8 +297,8 @@ void CodeViewRecordIO::emitEncodedSignedInteger(const int64_t &Value,
} else {
Streamer->emitIntValue(LF_QUADWORD, 2);
emitComment(Comment);
Streamer->emitIntValue(Value, 4);
incrStreamedLen(6);
Streamer->emitIntValue(Value, 4); // FIXME: Why not 8 (size of quadword)?
incrStreamedLen(6); // FIXME: Why not 10 (8 + 2)?
}
}
@ -313,10 +319,11 @@ void CodeViewRecordIO::emitEncodedUnsignedInteger(const uint64_t &Value,
Streamer->emitIntValue(Value, 4);
incrStreamedLen(6);
} else {
// FIXME: There are no test cases covering this block.
Streamer->emitIntValue(LF_UQUADWORD, 2);
emitComment(Comment);
Streamer->emitIntValue(Value, 8);
incrStreamedLen(6);
incrStreamedLen(6); // FIXME: Why not 10 (8 + 2)?
}
}

2
lib/IR/DIBuilder.cpp
View File

@ -243,7 +243,7 @@ DIMacroFile *DIBuilder::createTempMacroFile(DIMacroFile *Parent,
return MF;
}
DIEnumerator *DIBuilder::createEnumerator(StringRef Name, int64_t Val,
DIEnumerator *DIBuilder::createEnumerator(StringRef Name, uint64_t Val,
bool IsUnsigned) {
assert(!Name.empty() && "Unable to create enumerator without name");
return DIEnumerator::get(VMContext, APInt(64, Val, !IsUnsigned), IsUnsigned,

136
test/DebugInfo/COFF/integer-128.ll Normal file
View File

@ -0,0 +1,136 @@
; RUN: llc < %s | FileCheck %s --check-prefix=ASM
; // C++ source to regenerate:
; enum class uns : __uint128_t { unsval = __uint128_t(1) << 64 };
; uns t1() { return uns::unsval; }
; enum class sig : __int128 { sigval = -(__int128(1) << 64) };
; sig t2() { return sig::sigval; }
; struct test {
; static const __uint128_t u128 = __uint128_t(1) << 64;
; static const __int128 s128 = -(__int128(1) << 64);
; };
; test t3() { return test(); }
;
; $ clang a.cpp -S -emit-llvm -g -gcodeview
; ------------------------------------------------------------------------------
; ASM-LABEL: .long 241 # Symbol subsection for globals
;
; ASM-LABEL: .short 4359 # Record kind: S_CONSTANT
; ASM-NEXT: .long 4110 # Type
; ASM-NEXT: .byte 0x0a, 0x80, 0xff, 0xff # Value
; ASM-NEXT: .byte 0xff, 0xff, 0xff, 0xff
; ASM-NEXT: .byte 0xff, 0xff
; ASM-NEXT: .asciz "test::u128" # Name
; ASM-NEXT: .p2align 2
;
; ASM-LABEL: .short 4359 # Record kind: S_CONSTANT
; ASM-NEXT: .long 4111 # Type
; ASM-NEXT: .byte 0x09, 0x80, 0x00, 0x00 # Value
; ASM-NEXT: .byte 0x00, 0x00, 0x00, 0x00
; ASM-NEXT: .byte 0x00, 0x80
; ASM-NEXT: .asciz "test::s128" # Name
; ASM-NEXT: .p2align 2
;
; ASM-LABEL: .short 0x1203 # Record kind: LF_FIELDLIST
; ASM-NEXT: .short 0x1502 # Member kind: Enumerator ( LF_ENUMERATE )
; ASM-NEXT: .short 0x3 # Attrs: Public
; ASM-NEXT: .short 0x800a
; ASM-NEXT: .quad 0xffffffffffffffff # EnumValue
; ASM-NEXT: .asciz "unsval" # Name
;
; ASM-LABEL: .short 0x1203 # Record kind: LF_FIELDLIST
; ASM-NEXT: .short 0x1502 # Member kind: Enumerator ( LF_ENUMERATE )
; ASM-NEXT: .short 0x3 # Attrs: Public
; ASM-NEXT: .short 0x800a
; ASM-NEXT: .quad 0xffffffffffffffff # EnumValue
; ASM-NEXT: .asciz "sigval" # Name
; ------------------------------------------------------------------------------
; ModuleID = 'a.cpp'
source_filename = "a.cpp"
target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-windows-gnu"
%struct.test = type { i8 }
; Function Attrs: mustprogress noinline nounwind optnone
define dso_local <2 x i64> @_Z2t1v() #0 !dbg !23 {
entry:
%retval = alloca i128, align 16
store i128 18446744073709551616, i128* %retval, align 16, !dbg !27
%0 = bitcast i128* %retval to <2 x i64>*, !dbg !27
%1 = load <2 x i64>, <2 x i64>* %0, align 16, !dbg !27
ret <2 x i64> %1, !dbg !27
}
; Function Attrs: mustprogress noinline nounwind optnone
define dso_local <2 x i64> @_Z2t2v() #0 !dbg !28 {
entry:
%retval = alloca i128, align 16
store i128 -18446744073709551616, i128* %retval, align 16, !dbg !31
%0 = bitcast i128* %retval to <2 x i64>*, !dbg !31
%1 = load <2 x i64>, <2 x i64>* %0, align 16, !dbg !31
ret <2 x i64> %1, !dbg !31
}
; Function Attrs: mustprogress noinline nounwind optnone
define dso_local i8 @_Z2t3v() #1 !dbg !32 {
entry:
%retval = alloca %struct.test, align 1
%coerce.dive = getelementptr inbounds %struct.test, %struct.test* %retval, i32 0, i32 0, !dbg !41
%0 = load i8, i8* %coerce.dive, align 1, !dbg !41
ret i8 %0, !dbg !41
}
attributes #0 = { mustprogress noinline nounwind optnone "frame-pointer"="none" "min-legal-vector-width"="128" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-features"="+cx8,+mmx,+sse,+sse2,+x87" }
attributes #1 = { mustprogress noinline nounwind optnone "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-features"="+cx8,+mmx,+sse,+sse2,+x87" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!19, !20, !21}
!llvm.ident = !{!22}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 13.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !14, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "a.cpp", directory: ".", checksumkind: CSK_MD5, checksum: "b37f4034fd610917975e9c5ff097fa6b")
!2 = !{!3, !10}
!3 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "uns", file: !4, line: 4, baseType: !5, size: 128, flags: DIFlagEnumClass, elements: !8, identifier: "_ZTS3uns")
!4 = !DIFile(filename: "a.cpp", directory: ".", checksumkind: CSK_MD5, checksum: "b37f4034fd610917975e9c5ff097fa6b")
!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "__uint128_t", file: !6, baseType: !7)
!6 = !DIFile(filename: "a.cpp", directory: ".")
!7 = !DIBasicType(name: "unsigned __int128", size: 128, encoding: DW_ATE_unsigned)
!8 = !{!9}
!9 = !DIEnumerator(name: "unsval", value: 18446744073709551616, isUnsigned: true)
!10 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "sig", file: !4, line: 7, baseType: !11, size: 128, flags: DIFlagEnumClass, elements: !12, identifier: "_ZTS3sig")
!11 = !DIBasicType(name: "__int128", size: 128, encoding: DW_ATE_signed)
!12 = !{!13}
!13 = !DIEnumerator(name: "sigval", value: -18446744073709551616)
!14 = !{!15, !17}
!15 = !DIGlobalVariableExpression(var: !16, expr: !DIExpression())
!16 = distinct !DIGlobalVariable(name: "unsval", scope: !0, file: !4, line: 4, type: !3, isLocal: true, isDefinition: true)
!17 = !DIGlobalVariableExpression(var: !18, expr: !DIExpression())
!18 = distinct !DIGlobalVariable(name: "sigval", scope: !0, file: !4, line: 7, type: !10, isLocal: true, isDefinition: true)
!19 = !{i32 2, !"CodeView", i32 1}
!20 = !{i32 2, !"Debug Info Version", i32 3}
!21 = !{i32 1, !"wchar_size", i32 2}
!22 = !{!"clang version 13.0.0"}
!23 = distinct !DISubprogram(name: "t1", linkageName: "_Z2t1v", scope: !4, file: !4, line: 5, type: !24, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !26)
!24 = !DISubroutineType(types: !25)
!25 = !{!3}
!26 = !{}
!27 = !DILocation(line: 5, column: 12, scope: !23)
!28 = distinct !DISubprogram(name: "t2", linkageName: "_Z2t2v", scope: !4, file: !4, line: 8, type: !29, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !26)
!29 = !DISubroutineType(types: !30)
!30 = !{!10}
!31 = !DILocation(line: 8, column: 12, scope: !28)
!32 = distinct !DISubprogram(name: "t3", linkageName: "_Z2t3v", scope: !4, file: !4, line: 14, type: !33, scopeLine: 14, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !26)
!33 = !DISubroutineType(types: !34)
!34 = !{!35}
!35 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "test", file: !4, line: 10, size: 8, flags: DIFlagTypePassByValue, elements: !36, identifier: "_ZTS4test")
!36 = !{!37, !39}
!37 = !DIDerivedType(tag: DW_TAG_member, name: "u128", scope: !35, file: !4, line: 11, baseType: !38, flags: DIFlagStaticMember, extraData: i128 18446744073709551616)
!38 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !5)
!39 = !DIDerivedType(tag: DW_TAG_member, name: "s128", scope: !35, file: !4, line: 12, baseType: !40, flags: DIFlagStaticMember, extraData: i128 -18446744073709551616)
!40 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !11)
!41 = !DILocation(line: 14, column: 13, scope: !32)