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f93662d3d5
When two calls from the same MDLocation are inlined they currently get treated as one inlined function call (creating difficulty debugging, duplicate variables, etc). Clang worked around this by including column information on inline calls which doesn't address LTO inlining or calls to the same function from the same line and column (such as through a macro). It also didn't address ctor and member function calls. By making the inlinedAt locations distinct, every call site has an explicitly distinct location that cannot be coalesced with any other call. This can produce linearly (2x in the worst case where every call is inlined and the call instruction has a non-call instruction at the same location) more debug locations. Any increase beyond that are in cases where the Clang workaround was insufficient and the new scheme is creating necessary distinct nodes that were being erroneously coalesced previously. After this change to LLVM the incomplete workarounds in Clang. That should reduce the number of debug locations (in a build without column info, the default on Darwin, not the default on Linux) by not creating pseudo-distinct locations for every call to an inline function. (oh, and I made the inlined-at chain rebuilding iterative instead of recursive because I was having trouble wrapping my head around it the way it was - open to discussion on the right design for that function (including going back to a recursive solution)) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226736 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.8 KiB
LLVM
71 lines
2.8 KiB
LLVM
; RUN: opt < %s -inline -S | FileCheck %s
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; This was generated from the following source:
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; int a, b;
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; __attribute__((__always_inline__)) static void callee2() { b = 2; }
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; __attribute__((__nodebug__)) void callee() { a = 1; callee2(); }
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; void caller() { callee(); }
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; by running
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; clang -S test.c -emit-llvm -O1 -gline-tables-only -fno-strict-aliasing
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; CHECK-LABEL: @caller(
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; This instruction did not have a !dbg metadata in the callee.
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; CHECK: store i32 1, {{.*}}, !dbg [[A:!.*]]
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; This instruction came from callee with a !dbg metadata.
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; CHECK: store i32 2, {{.*}}, !dbg [[B:!.*]]
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; The remaining instruction from the caller.
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; CHECK: ret void, !dbg [[A]]
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; Debug location of the code in caller() and of the inlined code that did not
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; have any debug location before.
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; CHECK-DAG: [[A]] = !MDLocation(line: 4, scope: !{{[0-9]+}})
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; Debug location of the inlined code.
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; CHECK-DAG: [[B]] = !MDLocation(line: 2, scope: !{{[0-9]+}}, inlinedAt: [[A_INL:![0-9]*]])
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; CHECK-DAG: [[A_INL]] = distinct !MDLocation(line: 4, scope: !{{[0-9]+}})
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@a = common global i32 0, align 4
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@b = common global i32 0, align 4
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; Function Attrs: nounwind uwtable
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define void @callee() #0 {
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entry:
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store i32 1, i32* @a, align 4
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store i32 2, i32* @b, align 4, !dbg !11
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ret void
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}
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; Function Attrs: nounwind uwtable
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define void @caller() #0 {
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entry:
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tail call void @callee(), !dbg !12
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ret void, !dbg !12
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}
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = !{!"0x11\0012\00clang version 3.5.0 (210174)\001\00\000\00\002", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/code/llvm/build0/test.c] [DW_LANG_C99]
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!1 = !{!"test.c", !"/code/llvm/build0"}
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!2 = !{}
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!3 = !{!4, !7}
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!4 = !{!"0x2e\00caller\00caller\00\004\000\001\000\006\000\001\004", !1, !5, !6, null, void ()* @caller, null, null, !2} ; [ DW_TAG_subprogram ] [line 4] [def] [caller]
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!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [/code/llvm/build0/test.c]
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!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !2, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!7 = !{!"0x2e\00callee2\00callee2\00\002\001\001\000\006\000\001\002", !1, !5, !6, null, null, null, null, !2} ; [ DW_TAG_subprogram ] [line 2] [local] [def] [callee2]
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 2}
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!10 = !{!"clang version 3.5.0 (210174)"}
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!11 = !MDLocation(line: 2, scope: !7)
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!12 = !MDLocation(line: 4, scope: !4)
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