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Move Split DWARF handling to an MC option/command line argument rather than using metadata

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Since Split DWARF needs to name the actual .dwo file that is generated,
it can't be known at the time the llvm::Module is produced as it may be
merged with other Modules before the object is generated and that object
may be generated with any name.

By passing the Split DWARF file name when LLVM is producing object code
the .dwo file name in the object file can match correctly.

The support for Split DWARF for implicit modules remains the same -
using metadata to store the dwo name and dwo id so that potentially
multiple skeleton CUs referring to different dwo files can be generated
from one llvm::Module.

llvm-svn: 301062
This commit is contained in:
David Blaikie 2017-04-21 23:35:26 +00:00
parent 575aaa1960
commit 8ad792d2de
19 changed files with 32 additions and 36 deletions
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1
include/llvm/MC/MCTargetOptions.h
View File

@ -54,6 +54,7 @@ public:
int DwarfVersion = 0;
std::string ABIName;
std::string SplitDwarfFile;
/// Additional paths to search for `.include` directives when using the
/// integrated assembler.

19
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -90,14 +90,6 @@ DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
clEnumVal(Disable, "Disabled")),
cl::init(Default));
static cl::opt<DefaultOnOff>
SplitDwarf("split-dwarf", cl::Hidden,
cl::desc("Output DWARF5 split debug info."),
cl::values(clEnumVal(Default, "Default for platform"),
clEnumVal(Enable, "Enabled"),
clEnumVal(Disable, "Disabled")),
cl::init(Default));
static cl::opt<DefaultOnOff>
DwarfPubSections("generate-dwarf-pub-sections", cl::Hidden,
cl::desc("Generate DWARF pubnames and pubtypes sections"),
@ -253,11 +245,8 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
HasAppleExtensionAttributes = tuneForLLDB();
// Handle split DWARF. Off by default for now.
if (SplitDwarf == Default)
HasSplitDwarf = false;
else
HasSplitDwarf = SplitDwarf == Enable;
// Handle split DWARF.
HasSplitDwarf = !Asm->TM.Options.MCOptions.SplitDwarfFile.empty();
// Pubnames/pubtypes on by default for GDB.
if (DwarfPubSections == Default)
@ -412,7 +401,7 @@ DwarfDebug::constructDwarfCompileUnit(const DICompileUnit *DIUnit) {
if (useSplitDwarf()) {
NewCU.setSkeleton(constructSkeletonCU(NewCU));
NewCU.addString(Die, dwarf::DW_AT_GNU_dwo_name,
DIUnit->getSplitDebugFilename());
Asm->TM.Options.MCOptions.SplitDwarfFile);
}
// LTO with assembly output shares a single line table amongst multiple CUs.
@ -1885,7 +1874,7 @@ void DwarfDebug::emitDebugMacinfo() {
void DwarfDebug::initSkeletonUnit(const DwarfUnit &U, DIE &Die,
std::unique_ptr<DwarfCompileUnit> NewU) {
NewU->addString(Die, dwarf::DW_AT_GNU_dwo_name,
U.getCUNode()->getSplitDebugFilename());
Asm->TM.Options.MCOptions.SplitDwarfFile);
if (!CompilationDir.empty())
NewU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);

8
test/CodeGen/X86/dwarf-headers.ll
View File

@ -1,16 +1,16 @@
; RUN: llc -split-dwarf=Disable -dwarf-version=4 -generate-type-units \
; RUN: llc -dwarf-version=4 -generate-type-units \
; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: | llvm-dwarfdump - | FileCheck %s --check-prefix=SINGLE-4
; RUN: llc -split-dwarf=Enable -dwarf-version=4 -generate-type-units \
; RUN: llc -split-dwarf-file=foo.dwo -dwarf-version=4 -generate-type-units \
; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: | llvm-dwarfdump - | FileCheck %s --check-prefix=SPLIT-4
; RUN: llc -split-dwarf=Disable -dwarf-version=5 -generate-type-units \
; RUN: llc -dwarf-version=5 -generate-type-units \
; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: | llvm-dwarfdump - | FileCheck %s --check-prefix=SINGLE-5
; RUN: llc -split-dwarf=Enable -dwarf-version=5 -generate-type-units \
; RUN: llc -split-dwarf-file=foo.dwo -dwarf-version=5 -generate-type-units \
; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: | llvm-dwarfdump - | FileCheck %s --check-prefix=SPLIT-5

2
test/DebugInfo/Generic/empty.ll
View File

@ -1,7 +1,7 @@
; REQUIRES: object-emission
; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump - | FileCheck %s
; RUN: %llc_dwarf -split-dwarf=Enable < %s -filetype=obj | llvm-dwarfdump - | FileCheck --check-prefix=FISSION %s
; RUN: %llc_dwarf -split-dwarf-file=foo.dwo < %s -filetype=obj | llvm-dwarfdump - | FileCheck --check-prefix=FISSION %s
; darwin has a workaround for a linker bug so it always emits one line table entry
; XFAIL: darwin

2
test/DebugInfo/PowerPC/tls-fission.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -mtriple=powerpc64-unknown-linux-gnu -O0 -filetype=asm < %s | FileCheck %s
; RUN: llc -split-dwarf-file=foo.dwo -mtriple=powerpc64-unknown-linux-gnu -O0 -filetype=asm < %s | FileCheck %s
; FIXME: add relocation and DWARF expression support to llvm-dwarfdump & use
; that here instead of raw assembly printing

2
test/DebugInfo/X86/cu-ranges-odr.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llc -split-dwarf-file=foo.dwo -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump -debug-dump=all %t | FileCheck %s
; RUN: llvm-readobj --relocations %t | FileCheck --check-prefix=CHECK-RELOCS %s

4
test/DebugInfo/X86/cu-ranges.ll
View File

@ -1,8 +1,8 @@
; RUN: llc -split-dwarf=Enable -O0 %s -function-sections -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llc -split-dwarf-file=foo.dwo -O0 %s -function-sections -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump -debug-dump=abbrev %t | FileCheck --check-prefix=FUNCTION-SECTIONS %s
; RUN: llvm-readobj --relocations %t | FileCheck --check-prefix=FUNCTION-SECTIONS-RELOCS %s
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llc -split-dwarf-file=foo.dwo -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump -debug-dump=abbrev %t | FileCheck --check-prefix=NO-FUNCTION-SECTIONS %s
; From:

2
test/DebugInfo/X86/dwarf-pubnames-split.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -mtriple=x86_64-pc-linux-gnu -split-dwarf=Enable %s -o - | FileCheck %s
; RUN: llc -mtriple=x86_64-pc-linux-gnu -split-dwarf-file=foo.dwo %s -o - | FileCheck %s
; Derived from:
; int main (void) {

2
test/DebugInfo/X86/empty.ll
View File

@ -1,5 +1,5 @@
; RUN: llc -mtriple i686-pc-cygwin < %s -filetype=obj | llvm-dwarfdump - | FileCheck %s
; RUN: llc -mtriple i686-pc-cygwin -split-dwarf=Enable < %s -filetype=obj | llvm-dwarfdump - | FileCheck --check-prefix=FISSION %s
; RUN: llc -mtriple i686-pc-cygwin -split-dwarf-file=foo.dwo < %s -filetype=obj | llvm-dwarfdump - | FileCheck --check-prefix=FISSION %s
; Expect no line table entry since there are no functions and file references in this compile unit
; CHECK: .debug_line contents:

2
test/DebugInfo/X86/fission-cu.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llc -split-dwarf-file=baz.dwo -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump -debug-dump=all %t | FileCheck %s
; RUN: llvm-readobj --relocations %t | FileCheck --check-prefix=OBJ %s
; RUN: llvm-objdump -h %t | FileCheck --check-prefix=HDR %s

2
test/DebugInfo/X86/fission-hash.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llc -split-dwarf-file=foo.dwo -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump -debug-dump=all %t | FileCheck %s
; The source is an empty file.

2
test/DebugInfo/X86/fission-inline.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -O0 < %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj > %t
; RUN: llc -split-dwarf-file=foo.dwo -O0 < %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj > %t
; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
; RUN: llvm-objdump -r %t | FileCheck --check-prefix=RELOCS %s

2
test/DebugInfo/X86/fission-no-inlining.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -O0 < %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; RUN: llc -split-dwarf-file=foo.dwo -O0 < %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; CHECK-NOT: DW_TAG_subprogram

2
test/DebugInfo/X86/fission-ranges.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llc -split-dwarf-file=foo.dwo -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump %t | FileCheck %s
; RUN: llvm-objdump -h %t | FileCheck --check-prefix=HDR %s

2
test/DebugInfo/X86/generate-odr-hash.ll
View File

@ -4,7 +4,7 @@
; RUN: llvm-dwarfdump %t | FileCheck --check-prefix=CHECK --check-prefix=SINGLE %s
; RUN: llvm-readobj -s -t %t | FileCheck --check-prefix=OBJ_SINGLE %s
; RUN: llc < %s -split-dwarf=Enable -o %t -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu
; RUN: llc < %s -split-dwarf-file=foo.dwo -o %t -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu
; RUN: llvm-dwarfdump %t | FileCheck --check-prefix=CHECK --check-prefix=FISSION %s
; RUN: llvm-readobj -s -t %t | FileCheck --check-prefix=OBJ_FISSION %s

2
test/DebugInfo/X86/sret.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llc -split-dwarf-file=foo.dwo -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump -debug-dump=all %t | FileCheck %s --check-prefix=CHECK-DWO
; Based on the debuginfo-tests/sret.cpp code.

2
test/DebugInfo/X86/tls.ll
View File

@ -4,7 +4,7 @@
; RUN: llc %s -o - -filetype=asm -O0 -mtriple=i386-linux-gnu \
; RUN: | FileCheck --check-prefix=NOEMU --check-prefix=SINGLE --check-prefix=SINGLE-32 --check-prefix=GNUOP %s
; RUN: llc %s -o - -filetype=asm -O0 -mtriple=x86_64-unknown-linux-gnu -split-dwarf=Enable \
; RUN: llc %s -o - -filetype=asm -O0 -mtriple=x86_64-unknown-linux-gnu -split-dwarf-file=foo.dwo \
; RUN: | FileCheck --check-prefix=NOEMU --check-prefix=FISSION --check-prefix=GNUOP %s
; RUN: llc %s -o - -filetype=asm -O0 -mtriple=x86_64-scei-ps4 \

4
test/DebugInfo/X86/type_units_with_addresses.ll
View File

@ -1,9 +1,9 @@
; REQUIRES: object-emission
; RUN: llc -split-dwarf=Enable -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: llc -split-dwarf-file=foo.dwo -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: | llvm-dwarfdump - | FileCheck %s
; RUN: llc -split-dwarf=Disable -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: llc -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu < %s \
; RUN: | llvm-dwarfdump - | FileCheck --check-prefix=SINGLE %s
; Test case built from:

6
tools/llc/llc.cpp
View File

@ -90,6 +90,11 @@ OptLevel("O",
static cl::opt<std::string>
TargetTriple("mtriple", cl::desc("Override target triple for module"));
static cl::opt<std::string> SplitDwarfFile(
"split-dwarf-file",
cl::desc(
"Specify the name of the .dwo file to encode in the DWARF output"));
static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
cl::desc("Do not verify input module"));
@ -450,6 +455,7 @@ static int compileModule(char **argv, LLVMContext &Context) {
Options.MCOptions.AsmVerbose = AsmVerbose;
Options.MCOptions.PreserveAsmComments = PreserveComments;
Options.MCOptions.IASSearchPaths = IncludeDirs;
Options.MCOptions.SplitDwarfFile = SplitDwarfFile;
std::unique_ptr<TargetMachine> Target(
TheTarget->createTargetMachine(TheTriple.getTriple(), CPUStr, FeaturesStr,