144 lines
6.8 KiB
LLVM
144 lines
6.8 KiB
LLVM
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; RUN: opt < %s -always-inline -S | FileCheck %s
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;
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; Generated from the following C++ source with:
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; clang -cc1 -disable-llvm-optzns -emit-llvm -g -stack-protector 2 test.cpp
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;
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; /* BEGIN SOURCE */
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; int __attribute__((always_inline)) foo()
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; {
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; int arr[10];
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; arr[0] = 5;
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; int sum = 4;
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; return sum;
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; }
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;
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; extern void bar();
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;
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; int main()
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; {
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; bar();
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; int i = foo();
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; return i;
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; }
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; /* END SOURCE */
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; The patch that includes this test case, is addressing the following issue:
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;
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; When functions are inlined, instructions without debug information
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; are attributed with the call site's DebugLoc. After inlining, inlined static
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; allocas are moved to the caller's entry block, adjacent to the caller's original
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; static alloca instructions. By retaining the call site's DebugLoc, these instructions
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; may cause instructions that are subsequently inserted at the entry block to pick
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; up the same DebugLoc.
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;
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; In the offending case stack protection inserts an instruction at the caller's
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; entry block, which inadvertently picks up the inlined call's DebugLoc, because
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; the entry block's first instruction is the recently moved inlined alloca instruction.
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;
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; The stack protection instruction then becomes part of the function prologue, with the
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; result that the line number that is associated with the stack protection instruction
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; is deemed to be the end of the function prologue. Since this line number is the
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; call site's line number, setting a breakpoint at the function in the debugger
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; will make the user stop at the line of the inlined call.
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; Note that without the stack protection instruction this effect would not occur
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; because the allocas all get collapsed into a single instruction that reserves
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; stack space and have no further influence on the prologue's line number information.
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; The selected solution is to not attribute static allocas with the call site's
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; DebugLoc.
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; At some point in the future, it may be desirable to describe the inlining
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; in the alloca instructions, but then the code that handles prologues must
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; be able to handle this correctly, including the late insertion of instructions
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; into it.
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; In this context it is also important to distingush between functions
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; with the "nodebug" attribute and those without it. Alloca instructions from
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; nodebug functions should continue to have no DebugLoc, whereas those from
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; non-nodebug functions (i.e. functions with debug information) may want to
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; have their DebugLocs augmented with inlining information.
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; Make sure that after inlining the call to foo() the alloca instructions for
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; arr.i and sum.i do not retain debug information.
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; CHECK: %arr.i = alloca [10 x i32], align {{[0-9]*$}}
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; CHECK: %sum.i = alloca i32, align {{[0-9]*$}}
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; ModuleID = 'test.cpp'
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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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; Function Attrs: alwaysinline nounwind sspstrong
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define i32 @_Z3foov() #0 {
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entry:
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%arr = alloca [10 x i32], align 16
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%sum = alloca i32, align 4
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call void @llvm.dbg.declare(metadata [10 x i32]* %arr, metadata !14), !dbg !18
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%arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* %arr, i32 0, i64 0, !dbg !19
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store i32 5, i32* %arrayidx, align 4, !dbg !19
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call void @llvm.dbg.declare(metadata i32* %sum, metadata !20), !dbg !21
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store i32 4, i32* %sum, align 4, !dbg !21
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%0 = load i32, i32* %sum, align 4, !dbg !22
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ret i32 %0, !dbg !22
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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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; Function Attrs: nounwind sspstrong
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define i32 @main() #2 {
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entry:
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%retval = alloca i32, align 4
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%i = alloca i32, align 4
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store i32 0, i32* %retval
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call void @_Z3barv(), !dbg !23
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call void @llvm.dbg.declare(metadata i32* %i, metadata !24), !dbg !25
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%call = call i32 @_Z3foov(), !dbg !25
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store i32 %call, i32* %i, align 4, !dbg !25
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%0 = load i32, i32* %i, align 4, !dbg !26
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ret i32 %0, !dbg !26
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}
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declare void @_Z3barv() #3
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attributes #0 = { alwaysinline nounwind sspstrong "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "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 = { nounwind sspstrong "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "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 = !{!11, !12}
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!llvm.ident = !{!13}
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!0 = !{i32 786449, !1, i32 4, !"clang version 3.6.0 (217844)", i1 false, !"", i32 0, !2, !2, !3, !2, !2, !"", i32 1} ; [ DW_TAG_compile_unit ] [/home/user/test/<stdin>] [DW_LANG_C_plus_plus]
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!1 = !{!"<stdin>", !"/home/user/test"}
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!2 = !{}
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!3 = !{!4, !10}
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!4 = !{i32 786478, !5, !6, !"foo", !"foo", !"_Z3foov", i32 1, !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @_Z3foov, null, null, !2, i32 2} ; [ DW_TAG_subprogram ] [line 1] [def] [scope 2] [foo]
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!5 = !{!"test.cpp", !"/home/user/test"}
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!6 = !{i32 786473, !5} ; [ DW_TAG_file_type ] [/home/user/test/test.cpp]
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!7 = !{i32 786453, i32 0, null, !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, !8, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!8 = !{!9}
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!9 = !{i32 786468, null, null, !"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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!10 = !{i32 786478, !5, !6, !"main", !"main", !"", i32 11, !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @main, null, null, !2, i32 12} ; [ DW_TAG_subprogram ] [line 11] [def] [scope 12] [main]
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!11 = !{i32 2, !"Dwarf Version", i32 4}
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!12 = !{i32 2, !"Debug Info Version", i32 1}
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!13 = !{!"clang version 3.6.0 (217844)"}
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!14 = !{i32 786688, !4, !"arr", !6, i32 3, !15, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [arr] [line 3]
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!15 = !{i32 786433, null, null, !"", i32 0, i64 320, i64 32, i32 0, i32 0, !9, !16, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 320, align 32, offset 0] [from int]
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!16 = !{!17}
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!17 = !{i32 786465, i64 0, i64 10} ; [ DW_TAG_subrange_type ] [0, 9]
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!18 = !DILocation(line: 3, scope: !4)
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!19 = !DILocation(line: 4, scope: !4)
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!20 = !{i32 786688, !4, !"sum", !6, i32 5, !9, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [sum] [line 5]
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!21 = !DILocation(line: 5, scope: !4)
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!22 = !DILocation(line: 6, scope: !4)
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!23 = !DILocation(line: 13, scope: !10)
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!24 = !{i32 786688, !10, !"i", !6, i32 14, !9, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [i] [line 14]
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!25 = !DILocation(line: 14, scope: !10)
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!26 = !DILocation(line: 15, scope: !10)
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