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[codeview] Skip DIGlobalVariables with no variable

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They have probably been discarded during optimization.

llvm-svn: 272231
This commit is contained in:
Reid Kleckner 2016-06-09 00:29:00 +00:00
parent 36eb047792
commit 6d1d27542f
2 changed files with 38 additions and 2 deletions
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5
llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
View File

@ -1317,7 +1317,7 @@ void CodeViewDebug::emitDebugInfoForGlobals() {
switchToDebugSectionForSymbol(nullptr);
MCSymbol *EndLabel = nullptr;
for (const DIGlobalVariable *G : CU->getGlobalVariables()) {
if (const auto *GV = dyn_cast<GlobalVariable>(G->getVariable()))
if (const auto *GV = dyn_cast_or_null<GlobalVariable>(G->getVariable())) {
if (!GV->hasComdat()) {
if (!EndLabel) {
OS.AddComment("Symbol subsection for globals");
@ -1325,6 +1325,7 @@ void CodeViewDebug::emitDebugInfoForGlobals() {
}
emitDebugInfoForGlobal(G, Asm->getSymbol(GV));
}
}
}
if (EndLabel)
endCVSubsection(EndLabel);
@ -1332,7 +1333,7 @@ void CodeViewDebug::emitDebugInfoForGlobals() {
// Second, emit each global that is in a comdat into its own .debug$S
// section along with its own symbol substream.
for (const DIGlobalVariable *G : CU->getGlobalVariables()) {
if (const auto *GV = dyn_cast<GlobalVariable>(G->getVariable())) {
if (const auto *GV = dyn_cast_or_null<GlobalVariable>(G->getVariable())) {
if (GV->hasComdat()) {
MCSymbol *GVSym = Asm->getSymbol(GV);
OS.AddComment("Symbol subsection for " +

35
llvm/test/DebugInfo/COFF/globals-discarded.ll Normal file
View File

@ -0,0 +1,35 @@
; RUN: llc < %s | FileCheck %s
; This tests that we don't emit information about globals that were discarded
; during optimization. We should only see one global symbol record.
; CHECK: .short 4365 # Record kind: S_GDATA32
; CHECK: .long 117 # Type
; CHECK: .secrel32 x # DataOffset
; CHECK: .secidx x # Segment
; CHECK: .asciz "x" # Name
; CHECK-NOT: S_GDATA32
; ModuleID = 't.ii'
source_filename = "t.ii"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.0"
@x = global i32 42
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!35, !36, !37}
!llvm.ident = !{!38}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 272215) (llvm/trunk 272226)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !3)
!1 = !DIFile(filename: "t.c", directory: "foo")
!2 = !{}
!3 = !{!4, !6}
!4 = distinct !DIGlobalVariable(name: "_OptionsStorage", scope: !0, file: !1, line: 3, type: !5, isLocal: true, isDefinition: true)
!5 = !DIBasicType(name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
!6 = distinct !DIGlobalVariable(name: "x", scope: !0, file: !1, line: 4, type: !5, isLocal: true, isDefinition: true, variable: i32* @x)
!35 = !{i32 2, !"CodeView", i32 1}
!36 = !{i32 2, !"Debug Info Version", i32 3}
!37 = !{i32 1, !"PIC Level", i32 2}
!38 = !{!"clang version 3.9.0 (trunk 272215) (llvm/trunk 272226)"}