When computing the size of a base type be conservative if the type

is a declaration and return the size of the type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203690 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2014-03-12 18:18:05 +00:00
parent 9225686155
commit 365f0455a6
2 changed files with 145 additions and 2 deletions

View File

@ -751,8 +751,9 @@ static uint64_t getBaseTypeSize(DwarfDebug *DD, DIDerivedType Ty) {
DIType BaseType = DD->resolve(Ty.getTypeDerivedFrom());
// If this type is not derived from any type then take conservative approach.
if (!BaseType.isValid())
// If this type is not derived from any type or the type is a declaration then
// take conservative approach.
if (!BaseType.isValid() || BaseType.isForwardDecl())
return Ty.getSizeInBits();
// If this is a derived type, go ahead and get the base type, unless it's a

View File

@ -0,0 +1,142 @@
; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj %s -o %t
; RUN: llvm-dwarfdump %t | FileCheck %s
; Testcase from:
; struct base {
; virtual ~base();
; };
; struct foo {
; base b;
; };
; foo f;
; Where member b should be seen as a field at an offset and not a bitfield.
; CHECK: DW_AT_member
; CHECK: DW_AT_name{{.*}}"b"
; CHECK-NOT: DW_AT_bit_offset
@f = global %struct.foo zeroinitializer, align 8
@__dso_handle = external global i8
@_ZTV4base = external unnamed_addr constant [4 x i8*]
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
define internal void @__cxx_global_var_init() section ".text.startup" {
entry:
call void @_ZN3fooC2Ev(%struct.foo* @f) #2, !dbg !35
%0 = call i32 @__cxa_atexit(void (i8*)* bitcast (void (%struct.foo*)* @_ZN3fooD2Ev to void (i8*)*), i8* bitcast (%struct.foo* @f to i8*), i8* @__dso_handle) #2, !dbg !35
ret void, !dbg !35
}
; Function Attrs: inlinehint nounwind uwtable
define linkonce_odr void @_ZN3fooC2Ev(%struct.foo* %this) unnamed_addr #0 align 2 {
entry:
%this.addr = alloca %struct.foo*, align 8
store %struct.foo* %this, %struct.foo** %this.addr, align 8
call void @llvm.dbg.declare(metadata !{%struct.foo** %this.addr}, metadata !36), !dbg !38
%this1 = load %struct.foo** %this.addr
%b = getelementptr inbounds %struct.foo* %this1, i32 0, i32 0, !dbg !39
call void @_ZN4baseC2Ev(%struct.base* %b) #2, !dbg !39
ret void, !dbg !39
}
; Function Attrs: inlinehint uwtable
define linkonce_odr void @_ZN3fooD2Ev(%struct.foo* %this) unnamed_addr #1 align 2 {
entry:
%this.addr = alloca %struct.foo*, align 8
store %struct.foo* %this, %struct.foo** %this.addr, align 8
call void @llvm.dbg.declare(metadata !{%struct.foo** %this.addr}, metadata !40), !dbg !41
%this1 = load %struct.foo** %this.addr
%b = getelementptr inbounds %struct.foo* %this1, i32 0, i32 0, !dbg !42
call void @_ZN4baseD1Ev(%struct.base* %b), !dbg !42
ret void, !dbg !44
}
; Function Attrs: nounwind
declare i32 @__cxa_atexit(void (i8*)*, i8*, i8*) #2
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata) #3
declare void @_ZN4baseD1Ev(%struct.base*) #4
; Function Attrs: inlinehint nounwind uwtable
define linkonce_odr void @_ZN4baseC2Ev(%struct.base* %this) unnamed_addr #0 align 2 {
entry:
%this.addr = alloca %struct.base*, align 8
store %struct.base* %this, %struct.base** %this.addr, align 8
call void @llvm.dbg.declare(metadata !{%struct.base** %this.addr}, metadata !45), !dbg !47
%this1 = load %struct.base** %this.addr
%0 = bitcast %struct.base* %this1 to i8***, !dbg !48
store i8** getelementptr inbounds ([4 x i8*]* @_ZTV4base, i64 0, i64 2), i8*** %0, !dbg !48
ret void, !dbg !48
}
define internal void @_GLOBAL__I_a() section ".text.startup" {
entry:
call void @__cxx_global_var_init(), !dbg !49
ret void, !dbg !49
}
attributes #0 = { inlinehint nounwind uwtable "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" }
attributes #1 = { inlinehint uwtable "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" }
attributes #2 = { nounwind }
attributes #3 = { nounwind readnone }
attributes #4 = { "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.module.flags = !{!32, !33}
!llvm.ident = !{!34}
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