[llvm] r324850 - [CodeView] Allow variable names to be as long as the codeview format supports
Brock Wyma via llvm-commits
llvm-commits at lists.llvm.org
Sun Feb 11 13:26:47 PST 2018
Author: bwyma
Date: Sun Feb 11 13:26:46 2018
New Revision: 324850
URL: http://llvm.org/viewvc/llvm-project?rev=324850&view=rev
Log:
[CodeView] Allow variable names to be as long as the codeview format supports
Instead of reserving 0xF00 bytes for the fixed length portion of the CodeView
symbol name, calculate the actual length of the fixed length portion.
Differential Revision: https://reviews.llvm.org/D42125
Modified:
llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
llvm/trunk/test/DebugInfo/COFF/long-name.ll
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp?rev=324850&r1=324849&r2=324850&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp Sun Feb 11 13:26:46 2018
@@ -501,12 +501,12 @@ void CodeViewDebug::endModule() {
clear();
}
-static void emitNullTerminatedSymbolName(MCStreamer &OS, StringRef S) {
+static void emitNullTerminatedSymbolName(MCStreamer &OS, StringRef S,
+ unsigned MaxFixedRecordLength = 0xF00) {
// The maximum CV record length is 0xFF00. Most of the strings we emit appear
// after a fixed length portion of the record. The fixed length portion should
// always be less than 0xF00 (3840) bytes, so truncate the string so that the
// overall record size is less than the maximum allowed.
- unsigned MaxFixedRecordLength = 0xF00;
SmallString<32> NullTerminatedString(
S.take_front(MaxRecordLength - MaxFixedRecordLength - 1));
NullTerminatedString.push_back('\0');
@@ -2448,6 +2448,7 @@ void CodeViewDebug::emitDebugInfoForGlob
// FIXME: Thread local data, etc
MCSymbol *DataBegin = MMI->getContext().createTempSymbol(),
*DataEnd = MMI->getContext().createTempSymbol();
+ const unsigned FixedLengthOfThisRecord = 12;
OS.AddComment("Record length");
OS.emitAbsoluteSymbolDiff(DataEnd, DataBegin, 2);
OS.EmitLabel(DataBegin);
@@ -2475,6 +2476,6 @@ void CodeViewDebug::emitDebugInfoForGlob
OS.AddComment("Segment");
OS.EmitCOFFSectionIndex(GVSym);
OS.AddComment("Name");
- emitNullTerminatedSymbolName(OS, DIGV->getName());
+ emitNullTerminatedSymbolName(OS, DIGV->getName(), FixedLengthOfThisRecord);
OS.EmitLabel(DataEnd);
}
Modified: llvm/trunk/test/DebugInfo/COFF/long-name.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/COFF/long-name.ll?rev=324850&r1=324849&r2=324850&view=diff
==============================================================================
--- llvm/trunk/test/DebugInfo/COFF/long-name.ll (original)
+++ llvm/trunk/test/DebugInfo/COFF/long-name.ll Sun Feb 11 13:26:46 2018
@@ -13,11 +13,22 @@
; CHECK: ProcEnd {
; CHECK: }
+; CHECK: GlobalData {
+; CHECK: Kind: S_GDATA32 (0x110D)
+; CHECK: DataOffset: {{V+E}}
+; CHECK: Type: int (0x74)
+; CHECK: DisplayName: {{V+E}}
+; CHECK: LinkageName: {{V+E}}
+; CHECK: }
+;
+
; ModuleID = 't.c'
source_filename = "t.c"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.24210"
+ at 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= global i32 0, align 4, !dbg !12
+
; Function Attrs: nounwind uwtable
define void @f() #0 !dbg !7 {
entry:
@@ -30,7 +41,7 @@ attributes #0 = { nounwind uwtable "corr
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
-!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 283332) (llvm/trunk 283355)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 283332) (llvm/trunk 283355)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !11)
!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm\5Cbuild")
!2 = !{}
!3 = !{i32 2, !"CodeView", i32 1}
@@ -41,3 +52,7 @@ attributes #0 = { nounwind uwtable "corr
!8 = !DISubroutineType(types: !9)
!9 = !{null}
!10 = !DILocation(line: 1, scope: !7)
+!11 = !{!12}
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scope: !0, file: !1, line: 1, type: !14, isLocal: false, isDefinition: true)
+!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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