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IR / debug info: Add a DWOId field to DICompileUnit,

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so DWARF skeleton CUs can be expression in IR. A skeleton CU is a
(typically empty) DW_TAG_compile_unit that has a DW_AT_(GNU)_dwo_name and
a DW_AT_(GNU)_dwo_id attribute. It is used to refer to external debug info.

This is a prerequisite for clang module debugging as discussed in
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-November/040076.html.
In order to refer to external types stored in split DWARF (dwo) objects,
such as clang modules, we need to emit skeleton CUs, which identify the
dwarf object (i.e., the clang module) by filename (the SplitDebugFilename)
and a hash value, the dwo_id.

This patch only contains the IR changes. The idea is that a CUs with a
non-zero dwo_id field will be emitted together with a DW_AT_GNU_dwo_name
and DW_AT_GNU_dwo_id attribute.

http://reviews.llvm.org/D9488
rdar://problem/20091852

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237949 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl
2015-05-21 20:37:30 +00:00
parent 5368a26e16
commit 849c7601a0
13 changed files with 109 additions and 78 deletions
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4
lib/IR/DIBuilder.cpp
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@ -125,7 +125,7 @@ static DIScope *getNonCompileUnitScope(DIScope *N) {
DICompileUnit *DIBuilder::createCompileUnit(
unsigned Lang, StringRef Filename, StringRef Directory, StringRef Producer,
bool isOptimized, StringRef Flags, unsigned RunTimeVer, StringRef SplitName,
DebugEmissionKind Kind, bool EmitDebugInfo) {
DebugEmissionKind Kind, uint64_t DWOId, bool EmitDebugInfo) {
assert(((Lang <= dwarf::DW_LANG_Fortran08 && Lang >= dwarf::DW_LANG_C89) ||
(Lang <= dwarf::DW_LANG_hi_user && Lang >= dwarf::DW_LANG_lo_user)) &&
@ -147,7 +147,7 @@ DICompileUnit *DIBuilder::createCompileUnit(
VMContext, Lang, DIFile::get(VMContext, Filename, Directory), Producer,
isOptimized, Flags, RunTimeVer, SplitName, Kind, TempEnumTypes.get(),
TempRetainTypes.get(), TempSubprograms.get(), TempGVs.get(),
TempImportedModules.get());
TempImportedModules.get(), DWOId);
// Create a named metadata so that it is easier to find cu in a module.
// Note that we only generate this when the caller wants to actually