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https://github.com/c64scene-ar/llvm-6502.git
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a65da70a54
This reapplies r225379.
ChangeLog:
- The assertion that this commit previously ran into about the inability
to handle indirect variables has since been removed and the backend
can handle this now.
- Testcases were upgrade to the new MDLocation format.
- Instead of keeping a DebugDeclares map, we now use
llvm::FindAllocaDbgDeclare().
Original commit message follows.
Debug info: Teach SROA how to update debug info for fragmented variables.
This allows us to generate debug info for extremely advanced code such as
typedef struct { long int a; int b;} S;
int foo(S s) {
return s.b;
}
which at -O1 on x86_64 is codegen'd into
define i32 @foo(i64 %s.coerce0, i32 %s.coerce1) #0 {
ret i32 %s.coerce1, !dbg !24
}
with this patch we emit the following debug info for this
TAG_formal_parameter [3]
AT_location( 0x00000000
0x0000000000000000 - 0x0000000000000006: rdi, piece 0x00000008, rsi, piece 0x00000004
0x0000000000000006 - 0x0000000000000008: rdi, piece 0x00000008, rax, piece 0x00000004 )
AT_name( "s" )
AT_decl_file( "/Volumes/Data/llvm/_build.ninja.release/test.c" )
Thanks to chandlerc, dblaikie, and echristo for their feedback on all
previous iterations of this patch!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226598 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
2.9 KiB
LLVM
64 lines
2.9 KiB
LLVM
; RUN: opt %s -sroa -verify -S -o - | FileCheck %s
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; ModuleID = 'test.c'
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; Test that SROA updates the debug info correctly if an alloca was rewritten but
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; not partitioned into multiple allocas.
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;
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; CHECK: call void @llvm.dbg.value(metadata float %s.coerce, i64 0, metadata ![[VAR:[0-9]+]], metadata ![[EXPR:[0-9]+]])
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; CHECK: ![[VAR]] = {{.*}} [ DW_TAG_arg_variable ] [s] [line 3]
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; CHECK: ![[EXPR]] = {{.*}} [ DW_TAG_expression ]
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; CHECK-NOT: DW_OP_piece
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;
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; struct S { float f; };
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;
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; float foo(struct S s) {
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; return s.f;
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; }
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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%struct.S = type { float }
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; Function Attrs: nounwind ssp uwtable
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define float @foo(float %s.coerce) #0 {
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entry:
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%s = alloca %struct.S, align 4
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%coerce.dive = getelementptr %struct.S* %s, i32 0, i32 0
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store float %s.coerce, float* %coerce.dive, align 1
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call void @llvm.dbg.declare(metadata %struct.S* %s, metadata !16, metadata !17), !dbg !18
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%f = getelementptr inbounds %struct.S* %s, i32 0, i32 0, !dbg !19
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%0 = load float* %f, align 4, !dbg !19
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ret float %0, !dbg !19
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind ssp uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12, !13, !14}
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!llvm.ident = !{!15}
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!0 = !{!"0x11\0012\00clang version 3.6.0 \000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/Volumes/Data/llvm/_build.ninja.debug/test.c] [DW_LANG_C99]
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!1 = !{!"test.c", !"/Volumes/Data/llvm/_build.ninja.debug"}
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!2 = !{}
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!3 = !{!4}
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!4 = !{!"0x2e\00foo\00foo\00\003\000\001\000\000\00256\000\003", !1, !5, !6, null, float (float)* @foo, null, null, !2} ; [ DW_TAG_subprogram ] [line 3] [def] [foo]
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!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [/Volumes/Data/llvm/_build.ninja.debug/test.c]
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!6 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!7 = !{!8, !9}
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!8 = !{!"0x24\00float\000\0032\0032\000\000\004", null, null} ; [ DW_TAG_base_type ] [float] [line 0, size 32, align 32, offset 0, enc DW_ATE_float]
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!9 = !{!"0x13\00S\001\0032\0032\000\000\000", !1, null, null, !10, null, null, null} ; [ DW_TAG_structure_type ] [S] [line 1, size 32, align 32, offset 0] [def] [from ]
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!10 = !{!11}
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!11 = !{!"0xd\00f\001\0032\0032\000\000", !1, !9, !8} ; [ DW_TAG_member ] [f] [line 1, size 32, align 32, offset 0] [from float]
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!12 = !{i32 2, !"Dwarf Version", i32 2}
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!13 = !{i32 2, !"Debug Info Version", i32 2}
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!14 = !{i32 1, !"PIC Level", i32 2}
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!15 = !{!"clang version 3.6.0 "}
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!16 = !{!"0x101\00s\0016777219\000", !4, !5, !9} ; [ DW_TAG_arg_variable ] [s] [line 3]
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!17 = !{!"0x102"} ; [ DW_TAG_expression ]
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!18 = !MDLocation(line: 3, column: 20, scope: !4)
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!19 = !MDLocation(line: 4, column: 2, scope: !4)
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