mirror of
https://github.com/c64scene-ar/llvm-6502.git
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f4a702c079
Don't terminate location ranges for register-described variables at the end of machine basic block if this register is never modified in the function body, except for the prologue and epilogue. Prologue location is guessed by FrameSetup flags on MachineInstructions, while epilogue location is deduced from debug locations of instructions in the basic blocks ending with return instructions. This patch is mostly targeted to fix non-trivial debug locations for variables addressed via stack and frame pointers. It is not really a generic fix. We can still produce poor debug info for register-described variables if this register *is* modified somewhere in the function, but in unrelated places. This might be the case for the debug info in optimized binaries (e.g. for local variables in inlined functions). LiveDebugVariables pass in CodeGen attempts to fix this problem by adjusting DBG_VALUE instructions, but this pass is tied to greedy register allocator, which is used in optimized builds only. Proper fix would likely involve generalizing LiveDebugVariables to all register allocators. See more discussion in http://reviews.llvm.org/D3933 review thread. I'm proceeding with this patch to fix immediate severe problems and important cases, e.g. fix completely broken debug info with AddressSanitizer and fix PR19307 (missing debug info for by-value std::string arguments). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210492 91177308-0d34-0410-b5e6-96231b3b80d8
152 lines
7.8 KiB
LLVM
152 lines
7.8 KiB
LLVM
; RUN: llc %s -filetype=obj -O0 -mtriple=i386-unknown-linux-gnu -dwarf-version=4 -o %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; From the code:
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; debug-loc-offset1.cc
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; int bar (int b) {
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; return b+4;
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; }
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; debug-loc-offset2.cc
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; struct A {
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; int var;
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; virtual char foo();
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; };
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; void baz(struct A a) {
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; int z = 2;
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; if (a.var > 2)
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; z++;
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; if (a.foo() == 'a')
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; z++;
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; }
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; Compiled separately for i386-pc-linux-gnu and linked together.
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; This ensures that we have multiple compile units so that we can verify that
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; debug_loc entries are relative to the low_pc of the CU. The loc entry for
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; the byval argument in foo.cpp is in the second CU and so should have
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; an offset relative to that CU rather than from the beginning of the text
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; section.
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; Checking that we have two compile units with two sets of high/lo_pc.
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; CHECK: .debug_info contents
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_low_pc
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; CHECK: DW_AT_high_pc
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_low_pc
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; CHECK: DW_AT_high_pc
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_MIPS_linkage_name [DW_FORM_strp]{{.*}}"_Z3baz1A"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}}"a"
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; CHECK: DW_AT_location [DW_FORM_sec_offset] (0x00000000)
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; CHECK: DW_TAG_variable
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; CHECK: DW_AT_location [DW_FORM_exprloc]
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; CHECK-NOT: DW_AT_location
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; CHECK: .debug_loc contents:
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; CHECK: 0x00000000: Beginning address offset: 0x0000000000000000
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; CHECK: Ending address offset: 0x000000000000001a
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%struct.A = type { i32 (...)**, i32 }
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; Function Attrs: nounwind
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define i32 @_Z3bari(i32 %b) #0 {
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entry:
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%b.addr = alloca i32, align 4
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store i32 %b, i32* %b.addr, align 4
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call void @llvm.dbg.declare(metadata !{i32* %b.addr}, metadata !21), !dbg !22
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%0 = load i32* %b.addr, align 4, !dbg !23
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%add = add nsw i32 %0, 4, !dbg !23
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ret i32 %add, !dbg !23
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata) #1
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define void @_Z3baz1A(%struct.A* %a) #2 {
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entry:
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%z = alloca i32, align 4
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call void @llvm.dbg.declare(metadata !{%struct.A* %a}, metadata !24), !dbg !25
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call void @llvm.dbg.declare(metadata !{i32* %z}, metadata !26), !dbg !27
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store i32 2, i32* %z, align 4, !dbg !27
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%var = getelementptr inbounds %struct.A* %a, i32 0, i32 1, !dbg !28
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%0 = load i32* %var, align 4, !dbg !28
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%cmp = icmp sgt i32 %0, 2, !dbg !28
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br i1 %cmp, label %if.then, label %if.end, !dbg !28
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if.then: ; preds = %entry
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%1 = load i32* %z, align 4, !dbg !30
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%inc = add nsw i32 %1, 1, !dbg !30
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store i32 %inc, i32* %z, align 4, !dbg !30
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br label %if.end, !dbg !30
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if.end: ; preds = %if.then, %entry
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%call = call signext i8 @_ZN1A3fooEv(%struct.A* %a), !dbg !31
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%conv = sext i8 %call to i32, !dbg !31
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%cmp1 = icmp eq i32 %conv, 97, !dbg !31
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br i1 %cmp1, label %if.then2, label %if.end4, !dbg !31
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if.then2: ; preds = %if.end
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%2 = load i32* %z, align 4, !dbg !33
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%inc3 = add nsw i32 %2, 1, !dbg !33
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store i32 %inc3, i32* %z, align 4, !dbg !33
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br label %if.end4, !dbg !33
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if.end4: ; preds = %if.then2, %if.end
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ret void, !dbg !34
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}
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declare signext i8 @_ZN1A3fooEv(%struct.A*) #2
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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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attributes #1 = { nounwind readnone }
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attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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, !9}
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!llvm.module.flags = !{!18, !19}
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!llvm.ident = !{!20, !20}
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!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 (210479)", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/llvm_cmake_gcc/debug-loc-offset1.cc] [DW_LANG_C_plus_plus]
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!1 = metadata !{metadata !"debug-loc-offset1.cc", metadata !"/llvm_cmake_gcc"}
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!2 = metadata !{}
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!3 = metadata !{metadata !4}
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!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"bar", metadata !"bar", metadata !"_Z3bari", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @_Z3bari, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [bar]
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!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/llvm_cmake_gcc/debug-loc-offset1.cc]
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!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!7 = metadata !{metadata !8, metadata !8}
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!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
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!9 = metadata !{i32 786449, metadata !10, i32 4, metadata !"clang version 3.5.0 (210479)", i1 false, metadata !"", i32 0, metadata !2, metadata !11, metadata !13, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/llvm_cmake_gcc/debug-loc-offset2.cc] [DW_LANG_C_plus_plus]
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!10 = metadata !{metadata !"debug-loc-offset2.cc", metadata !"/llvm_cmake_gcc"}
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!11 = metadata !{metadata !12}
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!12 = metadata !{i32 786451, metadata !10, null, metadata !"A", i32 1, i64 0, i64 0, i32 0, i32 4, null, null, i32 0, null, null, metadata !"_ZTS1A"} ; [ DW_TAG_structure_type ] [A] [line 1, size 0, align 0, offset 0] [decl] [from ]
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!13 = metadata !{metadata !14}
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!14 = metadata !{i32 786478, metadata !10, metadata !15, metadata !"baz", metadata !"baz", metadata !"_Z3baz1A", i32 6, metadata !16, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (%struct.A*)* @_Z3baz1A, null, null, metadata !2, i32 6} ; [ DW_TAG_subprogram ] [line 6] [def] [baz]
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!15 = metadata !{i32 786473, metadata !10} ; [ DW_TAG_file_type ] [/llvm_cmake_gcc/debug-loc-offset2.cc]
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!16 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !17, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!17 = metadata !{null, metadata !12}
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!18 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
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!19 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
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!20 = metadata !{metadata !"clang version 3.5.0 (210479)"}
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!21 = metadata !{i32 786689, metadata !4, metadata !"b", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [b] [line 1]
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!22 = metadata !{i32 1, i32 0, metadata !4, null}
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!23 = metadata !{i32 2, i32 0, metadata !4, null}
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!24 = metadata !{i32 786689, metadata !14, metadata !"a", metadata !15, i32 16777222, metadata !"_ZTS1A", i32 8192, i32 0} ; [ DW_TAG_arg_variable ] [a] [line 6]
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!25 = metadata !{i32 6, i32 0, metadata !14, null}
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!26 = metadata !{i32 786688, metadata !14, metadata !"z", metadata !15, i32 7, metadata !8, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [z] [line 7]
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!27 = metadata !{i32 7, i32 0, metadata !14, null}
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!28 = metadata !{i32 8, i32 0, metadata !29, null} ; [ DW_TAG_imported_declaration ]
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!29 = metadata !{i32 786443, metadata !10, metadata !14, i32 8, i32 0, i32 0, i32 0} ; [ DW_TAG_lexical_block ] [/llvm_cmake_gcc/debug-loc-offset2.cc]
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!30 = metadata !{i32 9, i32 0, metadata !29, null}
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!31 = metadata !{i32 10, i32 0, metadata !32, null}
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!32 = metadata !{i32 786443, metadata !10, metadata !14, i32 10, i32 0, i32 0, i32 1} ; [ DW_TAG_lexical_block ] [/llvm_cmake_gcc/debug-loc-offset2.cc]
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!33 = metadata !{i32 11, i32 0, metadata !32, null}
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!34 = metadata !{i32 12, i32 0, metadata !14, null}
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