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llvm-6502/test/Linker/subprogram-linkonce-weak-odr.ll

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Reapply "Linker: Drop function pointers for overridden subprograms" This reverts commit r233254, effectively reapplying r233164 (and its successors), with an additional testcase for when subprograms match exactly. This fixes PR22792 (again). I'm using the same approach, but I've moved up the call to `stripReplacedSubprograms()`. The function pointers need to be dropped before mapping any metadata from the source module, or else this can drop the function from new subprograms that have merged (via Metadata uniquing) with the old ones. Dropping the pointers first prevents them from merging. **** The original commit message follows. **** Linker: Drop function pointers for overridden subprograms Instead of dropping subprograms that have been overridden, just set their function pointers to `nullptr`. This is a minor adjustment to the stop-gap fix for PR21910 committed in r224487, and fixes the crasher from PR22792. The problem that r224487 put a band-aid on: how do we find the canonical subprogram for a `Function`? Since the backend currently relies on `DebugInfoFinder` (which does a naive in-order traversal of compile units and picks the first subprogram) for this, r224487 tried dropping non-canonical subprograms. Dropping subprograms fails because the backend *also* builds up a map from subprogram to compile unit (`DwarfDebug::SPMap`) based on the subprogram lists. A missing subprogram causes segfaults later when an inlined reference (such as in this testcase) is created. Instead, just drop the `Function` pointer to `nullptr`, which nicely mirrors what happens when an already-inlined `Function` is optimized out. We can't really be sure that it's the same definition anyway, as the testcase demonstrates. This still isn't completely satisfactory. Two flaws at least that I can think of: - I still haven't found a straightforward way to make this symmetric in the IR. (Interestingly, the DWARF output is already symmetric, and I've tested for that to be sure we don't regress.) - Using `DebugInfoFinder` to find the canonical subprogram for a function is kind of crazy. We should just attach metadata to the function, like this: define weak i32 @foo(i32, i32) !dbg !MDSubprogram(...) { git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233302 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-26 18:35:30 +00:00
; RUN: llvm-link %s %S/Inputs/subprogram-linkonce-weak-odr.ll -S -o %t1
; RUN: FileCheck %s -check-prefix=LW -check-prefix=CHECK <%t1
; RUN: llvm-link %S/Inputs/subprogram-linkonce-weak-odr.ll %s -S -o %t2
; RUN: FileCheck %s -check-prefix=WL -check-prefix=CHECK <%t2
; This testcase tests the following flow:
; - File A defines a linkonce_odr version of @foo which has inlined into @bar.
; - File B defines a weak_odr version of @foo (identical definition).
; - Linkage rules state File B version of @foo wins.
; - Debug info for the subprograms of @foo match exactly. Without
; intervention, the same subprogram would show up in both compile units, and
; it would get associated with the compile unit where it was linkonce.
; - @bar has inlined debug info related to the linkonce_odr @foo.
;
; This checks a corner case for the fix for PR22792, where subprograms match
; exactly. It's a companion for subprogram-linkonce-weak.ll.
; The LW prefix means linkonce (this file) first, then weak (the other file).
; The WL prefix means weak (the other file) first, then linkonce (this file).
; We'll see @bar before @foo if this file is first.
; LW-LABEL: define i32 @bar(
; LW: %sum = add i32 %a, %b, !dbg ![[FOOINBAR:[0-9]+]]
; LW: ret i32 %sum, !dbg ![[BARRET:[0-9]+]]
; LW-LABEL: define weak_odr i32 @foo(
; LW: %sum = add i32 %a, %b, !dbg ![[FOOADD:[0-9]+]]
; LW: ret i32 %sum, !dbg ![[FOORET:[0-9]+]]
; We'll see @foo before @bar if this file is second.
; WL-LABEL: define weak_odr i32 @foo(
; WL: %sum = add i32 %a, %b, !dbg ![[FOOADD:[0-9]+]]
; WL: ret i32 %sum, !dbg ![[FOORET:[0-9]+]]
; WL-LABEL: define i32 @bar(
; WL: %sum = add i32 %a, %b, !dbg ![[FOOINBAR:[0-9]+]]
; WL: ret i32 %sum, !dbg ![[BARRET:[0-9]+]]
define i32 @bar(i32 %a, i32 %b) {
entry:
%sum = add i32 %a, %b, !dbg !MDLocation(line: 2, scope: !4,
inlinedAt: !MDLocation(line: 12, scope: !3))
ret i32 %sum, !dbg !MDLocation(line: 13, scope: !3)
}
define linkonce_odr i32 @foo(i32 %a, i32 %b) {
entry:
%sum = add i32 %a, %b, !dbg !MDLocation(line: 2, scope: !4)
ret i32 %sum, !dbg !MDLocation(line: 3, scope: !4)
}
!llvm.module.flags = !{!0}
!0 = !{i32 2, !"Debug Info Version", i32 3}
; CHECK-LABEL: !llvm.dbg.cu =
; LW-SAME: !{![[LCU:[0-9]+]], ![[WCU:[0-9]+]]}
; WL-SAME: !{![[WCU:[0-9]+]], ![[LCU:[0-9]+]]}
!llvm.dbg.cu = !{!1}
; LW: ![[LCU]] = !MDCompileUnit({{.*}} subprograms: ![[LSPs:[0-9]+]]
; LW: ![[LSPs]] = !{![[BARSP:[0-9]+]], ![[FOOSP:[0-9]+]]}
; LW: ![[BARSP]] = !MDSubprogram(name: "bar",
; LW-SAME: function: i32 (i32, i32)* @bar
; LW: ![[FOOSP]] = {{.*}}!MDSubprogram(name: "foo",
; LW-NOT: function:
; LW-SAME: ){{$}}
; LW: ![[WCU]] = !MDCompileUnit({{.*}} subprograms: ![[WSPs:[0-9]+]]
; LW: ![[WSPs]] = !{![[WEAKFOOSP:[0-9]+]]}
; LW: ![[WEAKFOOSP]] = !MDSubprogram(name: "foo",
; LW-SAME: function: i32 (i32, i32)* @foo
; LW: ![[FOOINBAR]] = !MDLocation(line: 2, scope: ![[FOOSP]], inlinedAt: ![[BARIA:[0-9]+]])
; LW: ![[BARIA]] = !MDLocation(line: 12, scope: ![[BARSP]])
; LW: ![[BARRET]] = !MDLocation(line: 13, scope: ![[BARSP]])
; LW: ![[FOOADD]] = !MDLocation(line: 2, scope: ![[WEAKFOOSP]])
; LW: ![[FOORET]] = !MDLocation(line: 3, scope: ![[WEAKFOOSP]])
; Same as above, but reordered.
; WL: ![[WCU]] = !MDCompileUnit({{.*}} subprograms: ![[WSPs:[0-9]+]]
; WL: ![[WSPs]] = !{![[WEAKFOOSP:[0-9]+]]}
; WL: ![[WEAKFOOSP]] = !MDSubprogram(name: "foo",
; WL-SAME: function: i32 (i32, i32)* @foo
; WL: ![[LCU]] = !MDCompileUnit({{.*}} subprograms: ![[LSPs:[0-9]+]]
; Note: for symmetry, LSPs would have a different copy of the subprogram.
; WL: ![[LSPs]] = !{![[BARSP:[0-9]+]], ![[WEAKFOOSP:[0-9]+]]}
; WL: ![[BARSP]] = !MDSubprogram(name: "bar",
; WL-SAME: function: i32 (i32, i32)* @bar
; WL: ![[FOOADD]] = !MDLocation(line: 2, scope: ![[WEAKFOOSP]])
; WL: ![[FOORET]] = !MDLocation(line: 3, scope: ![[WEAKFOOSP]])
; WL: ![[FOOINBAR]] = !MDLocation(line: 2, scope: ![[WEAKFOOSP]], inlinedAt: ![[BARIA:[0-9]+]])
; WL: ![[BARIA]] = !MDLocation(line: 12, scope: ![[BARSP]])
; WL: ![[BARRET]] = !MDLocation(line: 13, scope: ![[BARSP]])
!1 = !MDCompileUnit(language: DW_LANG_C99, file: !2, subprograms: !{!3, !4}, emissionKind: 1)
!2 = !MDFile(filename: "bar.c", directory: "/path/to/dir")
!3 = !MDSubprogram(file: !2, scope: !2, line: 11, name: "bar", function: i32 (i32, i32)* @bar, type: !6)
!4 = !MDSubprogram(file: !5, scope: !5, line: 1, name: "foo", function: i32 (i32, i32)* @foo, type: !6)
!5 = !MDFile(filename: "foo.h", directory: "/path/to/dir")
!6 = !MDSubroutineType(types: !{})
; Crasher for llc.
; REQUIRES: object-emission
; RUN: %llc_dwarf -filetype=obj -O0 %t1 -o %t1.o
; RUN: llvm-dwarfdump %t1.o -debug-dump=all | FileCheck %s -check-prefix=DWLW -check-prefix=DW
; RUN: %llc_dwarf -filetype=obj -O0 %t2 -o %t2.o
; RUN: llvm-dwarfdump %t2.o -debug-dump=all | FileCheck %s -check-prefix=DWWL -check-prefix=DW
; Check that the debug info puts the subprogram (with PCs) in the correct
; compile unit.
; DW-LABEL: .debug_info contents:
; DWLW: DW_TAG_compile_unit
; DWLW: DW_AT_name {{.*}}"bar.c"
; Note: If we stop emitting foo here, the comment below for DWWL (and the
; check) should be copied up here.
; DWLW: DW_TAG_subprogram
; DWLW-NOT: DW_AT_low_pc
; DWLW-NOT: DW_AT_high_pc
; DWLW: DW_AT_name {{.*}}foo
Fix subprogram-linkonce-weak.ll and subprogram-linkonce-weak-odr.ll for Windows. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233375 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-27 13:52:12 +00:00
; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}foo.h"
Reapply "Linker: Drop function pointers for overridden subprograms" This reverts commit r233254, effectively reapplying r233164 (and its successors), with an additional testcase for when subprograms match exactly. This fixes PR22792 (again). I'm using the same approach, but I've moved up the call to `stripReplacedSubprograms()`. The function pointers need to be dropped before mapping any metadata from the source module, or else this can drop the function from new subprograms that have merged (via Metadata uniquing) with the old ones. Dropping the pointers first prevents them from merging. **** The original commit message follows. **** Linker: Drop function pointers for overridden subprograms Instead of dropping subprograms that have been overridden, just set their function pointers to `nullptr`. This is a minor adjustment to the stop-gap fix for PR21910 committed in r224487, and fixes the crasher from PR22792. The problem that r224487 put a band-aid on: how do we find the canonical subprogram for a `Function`? Since the backend currently relies on `DebugInfoFinder` (which does a naive in-order traversal of compile units and picks the first subprogram) for this, r224487 tried dropping non-canonical subprograms. Dropping subprograms fails because the backend *also* builds up a map from subprogram to compile unit (`DwarfDebug::SPMap`) based on the subprogram lists. A missing subprogram causes segfaults later when an inlined reference (such as in this testcase) is created. Instead, just drop the `Function` pointer to `nullptr`, which nicely mirrors what happens when an already-inlined `Function` is optimized out. We can't really be sure that it's the same definition anyway, as the testcase demonstrates. This still isn't completely satisfactory. Two flaws at least that I can think of: - I still haven't found a straightforward way to make this symmetric in the IR. (Interestingly, the DWARF output is already symmetric, and I've tested for that to be sure we don't regress.) - Using `DebugInfoFinder` to find the canonical subprogram for a function is kind of crazy. We should just attach metadata to the function, like this: define weak i32 @foo(i32, i32) !dbg !MDSubprogram(...) { git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233302 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-26 18:35:30 +00:00
; DWLW: DW_AT_decl_line {{.*}}(1)
; DWLW: DW_TAG_subprogram
; DWLW: DW_AT_low_pc
; DWLW: DW_AT_high_pc
; DWLW: DW_AT_name {{.*}}bar
Fix subprogram-linkonce-weak.ll and subprogram-linkonce-weak-odr.ll for Windows. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233375 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-27 13:52:12 +00:00
; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}bar.c"
Reapply "Linker: Drop function pointers for overridden subprograms" This reverts commit r233254, effectively reapplying r233164 (and its successors), with an additional testcase for when subprograms match exactly. This fixes PR22792 (again). I'm using the same approach, but I've moved up the call to `stripReplacedSubprograms()`. The function pointers need to be dropped before mapping any metadata from the source module, or else this can drop the function from new subprograms that have merged (via Metadata uniquing) with the old ones. Dropping the pointers first prevents them from merging. **** The original commit message follows. **** Linker: Drop function pointers for overridden subprograms Instead of dropping subprograms that have been overridden, just set their function pointers to `nullptr`. This is a minor adjustment to the stop-gap fix for PR21910 committed in r224487, and fixes the crasher from PR22792. The problem that r224487 put a band-aid on: how do we find the canonical subprogram for a `Function`? Since the backend currently relies on `DebugInfoFinder` (which does a naive in-order traversal of compile units and picks the first subprogram) for this, r224487 tried dropping non-canonical subprograms. Dropping subprograms fails because the backend *also* builds up a map from subprogram to compile unit (`DwarfDebug::SPMap`) based on the subprogram lists. A missing subprogram causes segfaults later when an inlined reference (such as in this testcase) is created. Instead, just drop the `Function` pointer to `nullptr`, which nicely mirrors what happens when an already-inlined `Function` is optimized out. We can't really be sure that it's the same definition anyway, as the testcase demonstrates. This still isn't completely satisfactory. Two flaws at least that I can think of: - I still haven't found a straightforward way to make this symmetric in the IR. (Interestingly, the DWARF output is already symmetric, and I've tested for that to be sure we don't regress.) - Using `DebugInfoFinder` to find the canonical subprogram for a function is kind of crazy. We should just attach metadata to the function, like this: define weak i32 @foo(i32, i32) !dbg !MDSubprogram(...) { git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233302 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-26 18:35:30 +00:00
; DWLW: DW_AT_decl_line {{.*}}(11)
; DWLW: DW_TAG_inlined_subroutine
; DWLW: DW_AT_abstract_origin
; DWLW: DW_TAG_compile_unit
; DWLW: DW_AT_name {{.*}}"foo.c"
; DWLW: DW_TAG_subprogram
; DWLW: DW_AT_low_pc
; DWLW: DW_AT_high_pc
; DWLW: DW_AT_name {{.*}}foo
Fix subprogram-linkonce-weak.ll and subprogram-linkonce-weak-odr.ll for Windows. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233375 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-27 13:52:12 +00:00
; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}foo.h"
Reapply "Linker: Drop function pointers for overridden subprograms" This reverts commit r233254, effectively reapplying r233164 (and its successors), with an additional testcase for when subprograms match exactly. This fixes PR22792 (again). I'm using the same approach, but I've moved up the call to `stripReplacedSubprograms()`. The function pointers need to be dropped before mapping any metadata from the source module, or else this can drop the function from new subprograms that have merged (via Metadata uniquing) with the old ones. Dropping the pointers first prevents them from merging. **** The original commit message follows. **** Linker: Drop function pointers for overridden subprograms Instead of dropping subprograms that have been overridden, just set their function pointers to `nullptr`. This is a minor adjustment to the stop-gap fix for PR21910 committed in r224487, and fixes the crasher from PR22792. The problem that r224487 put a band-aid on: how do we find the canonical subprogram for a `Function`? Since the backend currently relies on `DebugInfoFinder` (which does a naive in-order traversal of compile units and picks the first subprogram) for this, r224487 tried dropping non-canonical subprograms. Dropping subprograms fails because the backend *also* builds up a map from subprogram to compile unit (`DwarfDebug::SPMap`) based on the subprogram lists. A missing subprogram causes segfaults later when an inlined reference (such as in this testcase) is created. Instead, just drop the `Function` pointer to `nullptr`, which nicely mirrors what happens when an already-inlined `Function` is optimized out. We can't really be sure that it's the same definition anyway, as the testcase demonstrates. This still isn't completely satisfactory. Two flaws at least that I can think of: - I still haven't found a straightforward way to make this symmetric in the IR. (Interestingly, the DWARF output is already symmetric, and I've tested for that to be sure we don't regress.) - Using `DebugInfoFinder` to find the canonical subprogram for a function is kind of crazy. We should just attach metadata to the function, like this: define weak i32 @foo(i32, i32) !dbg !MDSubprogram(...) { git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233302 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-26 18:35:30 +00:00
; DWLW: DW_AT_decl_line {{.*}}(1)
; The DWARF output is already symmetric (just reordered).
; DWWL: DW_TAG_compile_unit
; DWWL: DW_AT_name {{.*}}"foo.c"
; DWWL: DW_TAG_subprogram
; DWWL: DW_AT_low_pc
; DWWL: DW_AT_high_pc
; DWWL: DW_AT_name {{.*}}foo
Fix subprogram-linkonce-weak.ll and subprogram-linkonce-weak-odr.ll for Windows. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233375 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-27 13:52:12 +00:00
; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}foo.h"
Reapply "Linker: Drop function pointers for overridden subprograms" This reverts commit r233254, effectively reapplying r233164 (and its successors), with an additional testcase for when subprograms match exactly. This fixes PR22792 (again). I'm using the same approach, but I've moved up the call to `stripReplacedSubprograms()`. The function pointers need to be dropped before mapping any metadata from the source module, or else this can drop the function from new subprograms that have merged (via Metadata uniquing) with the old ones. Dropping the pointers first prevents them from merging. **** The original commit message follows. **** Linker: Drop function pointers for overridden subprograms Instead of dropping subprograms that have been overridden, just set their function pointers to `nullptr`. This is a minor adjustment to the stop-gap fix for PR21910 committed in r224487, and fixes the crasher from PR22792. The problem that r224487 put a band-aid on: how do we find the canonical subprogram for a `Function`? Since the backend currently relies on `DebugInfoFinder` (which does a naive in-order traversal of compile units and picks the first subprogram) for this, r224487 tried dropping non-canonical subprograms. Dropping subprograms fails because the backend *also* builds up a map from subprogram to compile unit (`DwarfDebug::SPMap`) based on the subprogram lists. A missing subprogram causes segfaults later when an inlined reference (such as in this testcase) is created. Instead, just drop the `Function` pointer to `nullptr`, which nicely mirrors what happens when an already-inlined `Function` is optimized out. We can't really be sure that it's the same definition anyway, as the testcase demonstrates. This still isn't completely satisfactory. Two flaws at least that I can think of: - I still haven't found a straightforward way to make this symmetric in the IR. (Interestingly, the DWARF output is already symmetric, and I've tested for that to be sure we don't regress.) - Using `DebugInfoFinder` to find the canonical subprogram for a function is kind of crazy. We should just attach metadata to the function, like this: define weak i32 @foo(i32, i32) !dbg !MDSubprogram(...) { git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233302 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-26 18:35:30 +00:00
; DWWL: DW_AT_decl_line {{.*}}(1)
; DWWL: DW_TAG_compile_unit
; DWWL: DW_AT_name {{.*}}"bar.c"
; Note: for symmetry, foo would also show up in this compile unit
; (alternatively, it wouldn't show up in the DWLW case). If we start emitting
; foo here, this should be updated by checking that we don't emit low_pc and
; high_pc for it.
; DWWL-NOT: DW_AT_name {{.*}}foo
; DWWL: DW_TAG_subprogram
; DWWL-NOT: DW_AT_name {{.*}}foo
; DWWL: DW_AT_low_pc
; DWWL: DW_AT_high_pc
; DWWL-NOT: DW_AT_name {{.*}}foo
; DWWL: DW_AT_name {{.*}}bar
Fix subprogram-linkonce-weak.ll and subprogram-linkonce-weak-odr.ll for Windows. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233375 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-27 13:52:12 +00:00
; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}bar.c"
Reapply "Linker: Drop function pointers for overridden subprograms" This reverts commit r233254, effectively reapplying r233164 (and its successors), with an additional testcase for when subprograms match exactly. This fixes PR22792 (again). I'm using the same approach, but I've moved up the call to `stripReplacedSubprograms()`. The function pointers need to be dropped before mapping any metadata from the source module, or else this can drop the function from new subprograms that have merged (via Metadata uniquing) with the old ones. Dropping the pointers first prevents them from merging. **** The original commit message follows. **** Linker: Drop function pointers for overridden subprograms Instead of dropping subprograms that have been overridden, just set their function pointers to `nullptr`. This is a minor adjustment to the stop-gap fix for PR21910 committed in r224487, and fixes the crasher from PR22792. The problem that r224487 put a band-aid on: how do we find the canonical subprogram for a `Function`? Since the backend currently relies on `DebugInfoFinder` (which does a naive in-order traversal of compile units and picks the first subprogram) for this, r224487 tried dropping non-canonical subprograms. Dropping subprograms fails because the backend *also* builds up a map from subprogram to compile unit (`DwarfDebug::SPMap`) based on the subprogram lists. A missing subprogram causes segfaults later when an inlined reference (such as in this testcase) is created. Instead, just drop the `Function` pointer to `nullptr`, which nicely mirrors what happens when an already-inlined `Function` is optimized out. We can't really be sure that it's the same definition anyway, as the testcase demonstrates. This still isn't completely satisfactory. Two flaws at least that I can think of: - I still haven't found a straightforward way to make this symmetric in the IR. (Interestingly, the DWARF output is already symmetric, and I've tested for that to be sure we don't regress.) - Using `DebugInfoFinder` to find the canonical subprogram for a function is kind of crazy. We should just attach metadata to the function, like this: define weak i32 @foo(i32, i32) !dbg !MDSubprogram(...) { git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233302 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-26 18:35:30 +00:00
; DWWL: DW_AT_decl_line {{.*}}(11)
; DWWL: DW_TAG_inlined_subroutine
; DWWL: DW_AT_abstract_origin
; DW-LABEL: .debug_line contents:
; Check that we have the right things in the line table as well.
; DWLW-LABEL: file_names[{{ *}}1]{{.*}} bar.c
; DWLW-LABEL: file_names[{{ *}}2]{{.*}} foo.h
; DWLW: 2 0 2 0 0 is_stmt prologue_end
; DWLW-LABEL: file_names[{{ *}}1]{{.*}} foo.h
; DWLW: 2 0 1 0 0 is_stmt prologue_end
; DWLW-NOT: prologue_end
; DWWL-LABEL: file_names[{{ *}}1]{{.*}} foo.h
; DWWL: 2 0 1 0 0 is_stmt prologue_end
; DWWL-LABEL: file_names[{{ *}}1]{{.*}} bar.c
; DWWL-LABEL: file_names[{{ *}}2]{{.*}} foo.h
; DWWL: 2 0 2 0 0 is_stmt prologue_end
; DWWL-NOT: prologue_end
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