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[codeview] Use character types for all byte-sized integer types

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The VS debugger doesn't appear to understand the 0x68 or 0x69 type
indices, which were probably intended for use on a platform where a C
'int' is 8 bits. So, use the character types instead. Clang was already
using the character types because '[u]int8_t' is usually defined in
terms of 'char'.

See the Rust issue for screenshots of what VS does:
https://github.com/rust-lang/rust/issues/36646

Fixes PR30552

llvm-svn: 282739
This commit is contained in:
Reid Kleckner 2016-09-29 17:55:01 +00:00
parent ccc2927b69
commit e45b2c7d8e
2 changed files with 65 additions and 10 deletions
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20
llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
View File

@ -1222,20 +1222,20 @@ TypeIndex CodeViewDebug::lowerTypeBasic(const DIBasicType *Ty) {
break;
case dwarf::DW_ATE_signed:
switch (ByteSize) {
case 1: STK = SimpleTypeKind::SByte; break;
case 2: STK = SimpleTypeKind::Int16Short; break;
case 4: STK = SimpleTypeKind::Int32; break;
case 8: STK = SimpleTypeKind::Int64Quad; break;
case 16: STK = SimpleTypeKind::Int128Oct; break;
case 1: STK = SimpleTypeKind::SignedCharacter; break;
case 2: STK = SimpleTypeKind::Int16Short; break;
case 4: STK = SimpleTypeKind::Int32; break;
case 8: STK = SimpleTypeKind::Int64Quad; break;
case 16: STK = SimpleTypeKind::Int128Oct; break;
}
break;
case dwarf::DW_ATE_unsigned:
switch (ByteSize) {
case 1: STK = SimpleTypeKind::Byte; break;
case 2: STK = SimpleTypeKind::UInt16Short; break;
case 4: STK = SimpleTypeKind::UInt32; break;
case 8: STK = SimpleTypeKind::UInt64Quad; break;
case 16: STK = SimpleTypeKind::UInt128Oct; break;
case 1: STK = SimpleTypeKind::UnsignedCharacter; break;
case 2: STK = SimpleTypeKind::UInt16Short; break;
case 4: STK = SimpleTypeKind::UInt32; break;
case 8: STK = SimpleTypeKind::UInt64Quad; break;
case 16: STK = SimpleTypeKind::UInt128Oct; break;
}
break;
case dwarf::DW_ATE_UTF:

55
llvm/test/DebugInfo/COFF/int8-char-type.ll Normal file
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@ -0,0 +1,55 @@
; RUN: llc < %s -filetype=obj | llvm-readobj - -codeview | FileCheck %s
; Use character types for all 8-bit integers. The VS debugger doesn't cope well
; with the T_[U]INT1 types. Non-C language frontends are likely use the normal
; DW_ATE_[un]signed encoding for all integer types if they don't have distinct
; integer types for characters types. This was PR30552.
; CHECK-LABEL: DataSym {
; CHECK-NEXT: Kind: S_GDATA32 (0x110D)
; CHECK-NEXT: DataOffset:
; CHECK-NEXT: Type: signed char (0x10)
; CHECK-NEXT: DisplayName: x
; CHECK-NEXT: LinkageName: x
; CHECK-NEXT: }
; CHECK-LABEL: DataSym {
; CHECK-NEXT: Kind: S_GDATA32 (0x110D)
; CHECK-NEXT: DataOffset:
; CHECK-NEXT: Type: unsigned char (0x20)
; CHECK-NEXT: DisplayName: y
; CHECK-NEXT: LinkageName: y
; CHECK-NEXT: }
source_filename = "-"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.24210"
@x = global i8 0, align 1, !dbg !0
@y = global i8 0, align 1, !dbg !5
!llvm.dbg.cu = !{!1}
!llvm.module.flags = !{!11, !12, !13}
!llvm.ident = !{!14}
!0 = distinct !DIGlobalVariable(name: "x", scope: !1, file: !6, line: 4, type: !9, isLocal: false, isDefinition: true)
!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 4.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4)
!2 = !DIFile(filename: "-", directory: "C:\5Csrc\5Cllvm\5Cbuild")
!3 = !{}
!4 = !{!0, !5}
!5 = distinct !DIGlobalVariable(name: "y", scope: !1, file: !6, line: 5, type: !7, isLocal: false, isDefinition: true)
!6 = !DIFile(filename: "<stdin>", directory: "C:\5Csrc\5Cllvm\5Cbuild")
!7 = !DIDerivedType(tag: DW_TAG_typedef, name: "uint8_t", file: !6, line: 3, baseType: !8)
; Manually modified to use DW_ATE_unsigned
!8 = !DIBasicType(size: 8, align: 8, encoding: DW_ATE_unsigned)
!9 = !DIDerivedType(tag: DW_TAG_typedef, name: "int8_t", file: !6, line: 2, baseType: !10)
; Manually modified to use DW_ATE_signed
!10 = !DIBasicType(size: 8, align: 8, encoding: DW_ATE_signed)
!11 = !{i32 2, !"CodeView", i32 1}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"PIC Level", i32 2}
!14 = !{!"clang version 4.0.0 "}