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a2029fa58e
In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
113 lines
4.0 KiB
LLVM
113 lines
4.0 KiB
LLVM
; RUN: opt -simplifycfg -sink-common-insts -S < %s | FileCheck %s
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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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; Simplify CFG will try to sink the last instruction in a series of basic
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; blocks, creating a "common" instruction in the successor block. If the
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; debug locations of the commoned instructions have different file/line
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; numbers the debug location of the common instruction should be a merged
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; location.
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; Generated from source:
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; extern int foo(void);
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; extern int bar(void);
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;
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; int test(int a, int b) {
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; if(a)
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; b -= foo();
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; else
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; b -= bar();
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; return b;
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; }
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; CHECK: define i32 @test
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; CHECK-LABEL: if.end:
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; CHECK: %[[PHI:.*]] = phi i32 [ %call1, %if.else ], [ %call, %if.then ]
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; CHECK: sub nsw i32 %b, %[[PHI]], !dbg [[testMergedLoc:![0-9]+]]
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; CHECK: ret i32
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define i32 @test(i32 %a, i32 %b) !dbg !6 {
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entry:
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%tobool = icmp ne i32 %a, 0, !dbg !8
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br i1 %tobool, label %if.then, label %if.else, !dbg !8
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if.then: ; preds = %entry
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%call = call i32 @foo(), !dbg !9
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%sub = sub nsw i32 %b, %call, !dbg !10
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br label %if.end, !dbg !11
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if.else: ; preds = %entry
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%call1 = call i32 @bar(), !dbg !12
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%sub2 = sub nsw i32 %b, %call1, !dbg !13
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ]
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ret i32 %b.addr.0, !dbg !14
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}
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; When the commoned instructions have the same debug location, this location
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; should be used as the location of the common instruction.
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; Generated from source (with -mllvm -no-discriminators and -gno-column-info):
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; int test2(int a, int b) {
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; if(a) b -= foo(); else b -= bar();
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; return b;
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; }
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; CHECK: define i32 @test2
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; CHECK-LABEL: if.end:
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; CHECK: %[[PHI:.*]] = phi i32 [ %call1, %if.else ], [ %call, %if.then ]
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; CHECK: sub nsw i32 %b, %[[PHI]], !dbg [[test2Loc:![0-9]+]]
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; CHECK: ret i32
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define i32 @test2(i32 %a, i32 %b) !dbg !15 {
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entry:
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%tobool = icmp ne i32 %a, 0, !dbg !16
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br i1 %tobool, label %if.then, label %if.else, !dbg !16
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if.then: ; preds = %entry
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%call = call i32 @foo(), !dbg !16
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%sub = sub nsw i32 %b, %call, !dbg !16
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br label %if.end, !dbg !16
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if.else: ; preds = %entry
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%call1 = call i32 @bar(), !dbg !16
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%sub2 = sub nsw i32 %b, %call1, !dbg !16
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ]
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ret i32 %b.addr.0, !dbg !17
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}
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; CHECK: [[testMergedLoc]] = !DILocation(line: 0
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; CHECK: [[test2Loc]] = !DILocation(line: 17
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declare i32 @foo()
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declare i32 @bar()
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 8, type: !7, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!7 = !DISubroutineType(types: !2)
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!8 = !DILocation(line: 9, column: 6, scope: !6)
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!9 = !DILocation(line: 10, column: 10, scope: !6)
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!10 = !DILocation(line: 10, column: 7, scope: !6)
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!11 = !DILocation(line: 10, column: 5, scope: !6)
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!12 = !DILocation(line: 12, column: 10, scope: !6)
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!13 = !DILocation(line: 12, column: 7, scope: !6)
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!14 = !DILocation(line: 13, column: 3, scope: !6)
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!15 = distinct !DISubprogram(name: "test2", scope: !1, file: !1, line: 16, type: !7, isLocal: false, isDefinition: true, scopeLine: 16, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!16 = !DILocation(line: 17, scope: !15)
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!17 = !DILocation(line: 18, scope: !15)
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