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Debug Info: remove duplication of DIEs when a DIE is part of the type system

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and it is shared across CUs.

We add a few maps in DwarfDebug to map MDNodes for the type system to the
corresponding DIEs: MDTypeNodeToDieMap, MDSPNodeToDieMap, and
MDStaticMemberNodeToDieMap. These DIEs can be shared across CUs, that is why we
keep the maps in DwarfDebug instead of CompileUnit.

Sometimes, when we try to add an attribute to a DIE, the DIE is not yet added
to its owner yet, so we don't know whether we should use ref_addr or ref4.
We create a worklist that will be processed during finalization to add
attributes with the correct form (ref_addr or ref4).

We add addDIEEntry to DwarfDebug to be a wrapper around DIE->addValue. It checks
whether we know the correct form, if not, we update the worklist
(DIEEntryWorklist).

A testing case is added to show that we only create a single DIE for a type
MDNode and we use ref_addr to refer to the type DIE.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191792 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2013-10-01 19:52:23 +00:00
parent dfef7cbfc6
commit 620f436b20
6 changed files with 129 additions and 18 deletions
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19
test/Linker/type-unique-simple-a.ll
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@@ -1,7 +1,22 @@
; RUN: llvm-link %s %p/type-unique-simple-b.ll -S -o - | FileCheck %s
; REQUIRES: object-emission
; CHECK: DW_TAG_structure_type
; RUN: llvm-link %s %p/type-unique-simple-b.ll -S -o %t
; RUN: cat %t | FileCheck %s -check-prefix=LINK
; RUN: llc -filetype=obj -O0 < %t > %t2
; RUN: llvm-dwarfdump -debug-dump=info %t2 | FileCheck %s
; CHECK: 0x[[INT:.*]]: DW_TAG_base_type
; CHECK-NEXT: DW_AT_name {{.*}} = "int"
; CHECK-NOT: DW_TAG_base_type
; CHECK: 0x[[BASE:.*]]: DW_TAG_structure_type
; CHECK-NEXT: DW_AT_name {{.*}} = "Base"
; CHECK-NOT: DW_TAG_structure_type
; CHECK: DW_TAG_formal_parameter
; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[INT]])
; CHECK: DW_TAG_variable
; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[BASE]])
; LINK: DW_TAG_structure_type
; LINK-NOT: DW_TAG_structure_type
; Content of header files:
; struct Base {
; int a;