[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)
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