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DebugInfo: Use base address selection entries for debug_loc
Unify the range and loc emission (for both DWARFv4 and DWARFv5 style lists) and take advantage of that unification to use strategic base addresses for loclists. Differential Revision: https://reviews.llvm.org/D68620 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374600 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
@@ -1,144 +1,119 @@
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; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -o %t < %s
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; RUN: llvm-dwarfdump -v %t | FileCheck %s
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; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t < %s
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; RUN: llvm-dwarfdump -v -debug-info -debug-loclists %t | FileCheck %s
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; CHECK: 0x00000033: DW_TAG_formal_parameter [3]
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000000c
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; CHECK-NEXT: [0x0000000000000000, 0x0000000000000004): DW_OP_breg5 RDI+0
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; CHECK-NEXT: [0x0000000000000004, 0x0000000000000012): DW_OP_breg3 RBX+0)
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; CHECK-NEXT: DW_AT_name [DW_FORM_strx1] (indexed (0000000e) string = "a")
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; CHECK-NEXT: DW_AT_decl_file [DW_FORM_data1] ("/home/folder{{\\|\/}}test.cc")
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; CHECK-NEXT: DW_AT_decl_line [DW_FORM_data1] (6)
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4] (cu + 0x0040 => {0x00000040} "A")
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; CHECK: DW_TAG_variable
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; FIXME: Use DW_FORM_loclistx to reduce relocations
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000000c
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; CHECK-NEXT: [0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value
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; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value)
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; CHECK-NEXT: DW_AT_name {{.*}} "y"
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; CHECK: DW_TAG_variable
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; FIXME: Use DW_FORM_loclistx to reduce relocations
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000001d
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; CHECK-NEXT: Addr idx 0 (w/ length 3): DW_OP_consts +5, DW_OP_stack_value)
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; CHECK-NEXT: DW_AT_name {{.*}} "x"
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; CHECK: DW_TAG_variable
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; FIXME: Use DW_FORM_loclistx to reduce relocations
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x00000025
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; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX)
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; CHECK-NEXT: DW_AT_name {{.*}} "r"
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; CHECK: .debug_loclists contents:
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; CHECK-NEXT: 0x00000000: locations list header: length = 0x00000015, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000000
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; CHECK-NEXT: 0x00000000: locations list header: length = 0x00000029, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000000
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; Don't use startx_length if there's more than one entry, because the shared
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; base address will be useful for both the range that does start at the start of
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; the function, and the one that doesn't.
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; CHECK-NEXT: 0x0000000c:
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; CHECK-NEXT: DW_LLE_offset_pair(0x0000000000000000, 0x0000000000000004)
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; CHECK-NEXT: => [0x0000000000000000, 0x0000000000000004): DW_OP_breg5 RDI+0
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; CHECK-NEXT: DW_LLE_offset_pair(0x0000000000000004, 0x0000000000000012)
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; CHECK-NEXT: => [0x0000000000000004, 0x0000000000000012): DW_OP_breg3 RBX+0
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; CHECK-NEXT: DW_LLE_base_addressx(0x0000000000000000)
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; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000000, 0x0000000000000003)
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; CHECK-NEXT: => [0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value
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; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004)
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; CHECK-NEXT: => [0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value
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; CHECK-NEXT: DW_LLE_end_of_list ()
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; There is no way to use llvm-dwarfdump atm (2018, october) to verify the DW_LLE_* codes emited,
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; because dumper is not yet implements that. Use asm code to do this check instead.
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;
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; RUN: llc -mtriple=x86_64-pc-linux -filetype=asm < %s -o - | FileCheck %s --check-prefix=ASM
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; ASM: .section .debug_loclists,"",@progbits
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; ASM-NEXT: .long .Ldebug_loclist_table_end0-.Ldebug_loclist_table_start0 # Length
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; ASM-NEXT: .Ldebug_loclist_table_start0:
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; ASM-NEXT: .short 5 # Version
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; ASM-NEXT: .byte 8 # Address size
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; ASM-NEXT: .byte 0 # Segment selector size
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; ASM-NEXT: .long 0 # Offset entry count
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; ASM-NEXT: .Lloclists_table_base0:
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; ASM-NEXT: .Ldebug_loc0:
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; ASM-NEXT: .byte 4 # DW_LLE_offset_pair
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; ASM-NEXT: .uleb128 .Lfunc_begin0-.Lfunc_begin0 # starting offset
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; ASM-NEXT: .uleb128 .Ltmp0-.Lfunc_begin0 # ending offset
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; ASM-NEXT: .byte 2 # Loc expr size
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; ASM-NEXT: .byte 117 # DW_OP_breg5
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; ASM-NEXT: .byte 0 # 0
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; ASM-NEXT: .byte 4 # DW_LLE_offset_pair
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; ASM-NEXT: .uleb128 .Ltmp0-.Lfunc_begin0 # starting offset
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; ASM-NEXT: .uleb128 .Ltmp1-.Lfunc_begin0 # ending offset
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; ASM-NEXT: .byte 2 # Loc expr size
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; ASM-NEXT: .byte 115 # DW_OP_breg3
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; ASM-NEXT: .byte 0 # 0
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; ASM-NEXT: .byte 0 # DW_LLE_end_of_list
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; ASM-NEXT: .Ldebug_loclist_table_end0:
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; Show that startx_length can be used when the address range starts at the start of the function.
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; ModuleID = 'test.cc'
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source_filename = "test.cc"
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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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; CHECK: 0x0000001d:
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; CHECK-NEXT: DW_LLE_startx_length(0x0000000000000000, 0x0000000000000003)
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; CHECK-NEXT: => Addr idx 0 (w/ length 3): DW_OP_consts +5, DW_OP_stack_value
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; CHECK-NEXT: DW_LLE_end_of_list ()
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%struct.A = type { i32 (...)** }
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; And use a base address when the range doesn't start at an existing/useful
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; address in the pool.
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@_ZTV1A = dso_local unnamed_addr constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* bitcast ({ i8*, i8* }* @_ZTI1A to i8*), i8* bitcast (void (%struct.A*)* @_ZN1A3fooEv to i8*), i8* bitcast (void (%struct.A*)* @_ZN1A3barEv to i8*)] }, align 8
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@_ZTVN10__cxxabiv117__class_type_infoE = external dso_local global i8*
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@_ZTS1A = dso_local constant [3 x i8] c"1A\00", align 1
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@_ZTI1A = dso_local constant { i8*, i8* } { i8* bitcast (i8** getelementptr inbounds (i8*, i8** @_ZTVN10__cxxabiv117__class_type_infoE, i64 2) to i8*), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @_ZTS1A, i32 0, i32 0) }, align 8
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; CHECK: 0x00000025:
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; CHECK-NEXT: DW_LLE_base_addressx(0x0000000000000000)
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; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004)
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; CHECK-NEXT: => [0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX
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; CHECK-NEXT: DW_LLE_end_of_list ()
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; Function Attrs: noinline optnone uwtable
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define dso_local void @_Z3baz1A(%struct.A* %a) #0 !dbg !7 {
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; Built with clang -O3 -ffunction-sections from source:
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;
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; int f1(int i, int j) {
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; int x = 5;
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; int y = 3;
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; int r = i + j;
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; int undef;
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; x = undef;
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; y = 4;
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; return r;
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; }
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; void f2() {
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; }
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; Function Attrs: norecurse nounwind readnone uwtable
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define dso_local i32 @_Z2f1ii(i32 %i, i32 %j) local_unnamed_addr !dbg !7 {
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entry:
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call void @llvm.dbg.declare(metadata %struct.A* %a, metadata !23, metadata !DIExpression()), !dbg !24
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call void @_ZN1A3fooEv(%struct.A* %a), !dbg !25
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call void @_ZN1A3barEv(%struct.A* %a), !dbg !26
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ret void, !dbg !27
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call void @llvm.dbg.value(metadata i32 %i, metadata !12, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 %j, metadata !13, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 3, metadata !15, metadata !DIExpression()), !dbg !18
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%add = add nsw i32 %j, %i, !dbg !19
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call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 4, metadata !15, metadata !DIExpression()), !dbg !18
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ret i32 %add, !dbg !20
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_ZN1A3fooEv(%struct.A* %this) unnamed_addr #2 align 2 !dbg !28 {
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; Function Attrs: norecurse nounwind readnone uwtable
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define dso_local void @_Z2f2v() local_unnamed_addr !dbg !21 {
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entry:
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%this.addr = alloca %struct.A*, align 8
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store %struct.A* %this, %struct.A** %this.addr, align 8
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call void @llvm.dbg.declare(metadata %struct.A** %this.addr, metadata !29, metadata !DIExpression()), !dbg !31
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%this1 = load %struct.A*, %struct.A** %this.addr, align 8
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ret void, !dbg !32
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_ZN1A3barEv(%struct.A* %this) unnamed_addr #2 align 2 !dbg !33 {
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entry:
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%this.addr = alloca %struct.A*, align 8
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store %struct.A* %this, %struct.A** %this.addr, align 8
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call void @llvm.dbg.declare(metadata %struct.A** %this.addr, metadata !34, metadata !DIExpression()), !dbg !35
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%this1 = load %struct.A*, %struct.A** %this.addr, align 8
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ret void, !dbg !36
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}
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; Function Attrs: noinline norecurse nounwind optnone uwtable
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define dso_local i32 @main() #3 !dbg !37 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval, align 4
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ret i32 0, !dbg !38
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ret void, !dbg !24
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 (trunk 344035)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "test.cc", directory: "/home/folder", checksumkind: CSK_MD5, checksum: "e0f357ad6dcb791a774a0dae55baf5e7")
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "loc2.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch", checksumkind: CSK_MD5, checksum: "91e0069c680e2a63f4f885ec93f5d07e")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 5}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 8.0.0 (trunk 344035)"}
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!7 = distinct !DISubprogram(name: "baz", linkageName: "_Z3baz1A", scope: !1, file: !1, line: 6, type: !8, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!6 = !{!"clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)"}
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!7 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1ii", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null, !10}
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!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !1, line: 1, size: 64, flags: DIFlagTypePassByReference, elements: !11, vtableHolder: !10, identifier: "_ZTS1A")
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!11 = !{!12, !18, !22}
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!12 = !DIDerivedType(tag: DW_TAG_member, name: "_vptr$A", scope: !1, file: !1, baseType: !13, size: 64, flags: DIFlagArtificial)
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, name: "__vtbl_ptr_type", baseType: !15, size: 64)
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!15 = !DISubroutineType(types: !16)
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!16 = !{!17}
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!17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!18 = !DISubprogram(name: "foo", linkageName: "_ZN1A3fooEv", scope: !10, file: !1, line: 2, type: !19, isLocal: false, isDefinition: false, scopeLine: 2, containingType: !10, virtuality: DW_VIRTUALITY_virtual, virtualIndex: 0, flags: DIFlagPrototyped, isOptimized: false)
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!19 = !DISubroutineType(types: !20)
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!20 = !{null, !21}
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!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
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!22 = !DISubprogram(name: "bar", linkageName: "_ZN1A3barEv", scope: !10, file: !1, line: 3, type: !19, isLocal: false, isDefinition: false, scopeLine: 3, containingType: !10, virtuality: DW_VIRTUALITY_virtual, virtualIndex: 1, flags: DIFlagPrototyped, isOptimized: false)
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!23 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 6, type: !10)
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!24 = !DILocation(line: 6, column: 19, scope: !7)
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!25 = !DILocation(line: 7, column: 6, scope: !7)
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!26 = !DILocation(line: 8, column: 6, scope: !7)
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!27 = !DILocation(line: 9, column: 1, scope: !7)
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!28 = distinct !DISubprogram(name: "foo", linkageName: "_ZN1A3fooEv", scope: !10, file: !1, line: 12, type: !19, isLocal: false, isDefinition: true, scopeLine: 12, flags: DIFlagPrototyped, isOptimized: false, unit: !0, declaration: !18, retainedNodes: !2)
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!29 = !DILocalVariable(name: "this", arg: 1, scope: !28, type: !30, flags: DIFlagArtificial | DIFlagObjectPointer)
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!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
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!31 = !DILocation(line: 0, scope: !28)
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!32 = !DILocation(line: 12, column: 16, scope: !28)
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!33 = distinct !DISubprogram(name: "bar", linkageName: "_ZN1A3barEv", scope: !10, file: !1, line: 13, type: !19, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: false, unit: !0, declaration: !22, retainedNodes: !2)
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!34 = !DILocalVariable(name: "this", arg: 1, scope: !33, type: !30, flags: DIFlagArtificial | DIFlagObjectPointer)
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!35 = !DILocation(line: 0, scope: !33)
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!36 = !DILocation(line: 13, column: 16, scope: !33)
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!37 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 15, type: !15, isLocal: false, isDefinition: true, scopeLine: 15, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!38 = !DILocation(line: 16, column: 3, scope: !37)
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!9 = !{!10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12, !13, !14, !15, !16, !17}
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!12 = !DILocalVariable(name: "i", arg: 1, scope: !7, file: !1, line: 1, type: !10)
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!13 = !DILocalVariable(name: "j", arg: 2, scope: !7, file: !1, line: 1, type: !10)
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!14 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 2, type: !10)
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!15 = !DILocalVariable(name: "y", scope: !7, file: !1, line: 3, type: !10)
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!16 = !DILocalVariable(name: "r", scope: !7, file: !1, line: 4, type: !10)
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!17 = !DILocalVariable(name: "undef", scope: !7, file: !1, line: 5, type: !10)
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!18 = !DILocation(line: 0, scope: !7)
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!19 = !DILocation(line: 4, column: 13, scope: !7)
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!20 = !DILocation(line: 8, column: 3, scope: !7)
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!21 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 10, type: !22, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!22 = !DISubroutineType(types: !23)
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!23 = !{null}
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!24 = !DILocation(line: 11, column: 1, scope: !21)
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@@ -11,6 +11,7 @@
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; CHECK: _ZN1B9AInstanceEv
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x00000000
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; CHECK-NEXT: [0xffffffffffffffff, {{.*}}): {{$}}
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; CHECK-NEXT: [{{.*}}, {{.*}}): DW_OP_breg5 RDI+0
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; CHECK-NEXT: [{{.*}}, {{.*}}): DW_OP_breg6 RBP-24, DW_OP_deref)
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; CHECK-NEXT: DW_AT_name {{.*}}"a"
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