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[lldb][test] Add test-coverage for DW_AT_APPLE_objc_complete_type parsing #120279

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Merged
merged 2 commits into from
Dec 20, 2024
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[lldb][test] Add test-coverage for DW_AT_APPLE_objc_complete_type parsing #120279

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[lldb][test] Add test-coverage for DW_AT_APPLE_objc_complete_type par…
Michael137 Dec 17, 2024
92a272d
fixup! add REQUIRES: system-darwin
Michael137 Dec 20, 2024
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65 changes: 65 additions & 0 deletions lldb/test/Shell/Expr/TestObjCHiddenIvars.test
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# REQUIRES: system-darwin
#
# Tests that LLDB correctly finds the implementation
# DIE (with a `DW_AT_APPLE_objc_complete_type`)
# given an interface DIE (without said attribute).
#
# RUN: split-file %s %t
# RUN: %clangxx_host %t/lib.m -c -g -o %t/lib.o
# RUN: %clangxx_host %t/main.m -c -g -o %t/main.o
# RUN: %clangxx_host %t/main.o %t/lib.o -o %t/a.out -framework Foundation
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@labath labath Dec 18, 2024

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I think this needs a REQUIRES: system-darwin.

For science, I also tried to make a version of this test which could run on other systems, but all I managed is to hit an (lldb)assert:

$ cat a.m 
__attribute__((objc_root_class)) @interface  Foo  {
int y;
}
@end

#ifdef DEF
@implementation Foo {
    int i;
}

- (id)init {
  self->i = 1;
  self->y = 2;

  return self;
}
@end
#endif

Foo *foo;
$ clang -c a.m -g -DDEF --target=aarch64-apple-macosx
$ lldb a.o -o "target variable foo[0]"
(lldb) target create "a.o"
Current executable set to '/tmp/a.o' (arm64).
(lldb) target variable foo[0]
warning: trying to determine the size of type @interface Foo{
    int y;
    int i;
}
@end
without a valid ExecutionContext. this is not reliable. please file a bug against LLDB.
backtrace:
 #0 0x00007f117b0ab29e llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) llvm/lib/Support/Unix/Signals.inc:723:22
 #1 0x00007f117af11e90 lldb_private::TypeSystemClang::GetObjCBitSize(clang::QualType, lldb_private::ExecutionContextScope*) lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:4780:17

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@Michael137 Michael137 Dec 20, 2024

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Thanks for trying! Yea I'll probably add the Darwin requirement then

#
# RUN: %lldb %t/a.out \
# RUN: -o "breakpoint set -p 'return' -X main" \
# RUN: -o run \
# RUN: -o "expression *f" \
# RUN: -o exit | FileCheck %s

# CHECK: (lldb) expression *f
# CHECK: (Foo) ${{[0-9]+}} = {
# CHECK: y = 2
# CHECK-NEXT: i = 1

#--- main.m
#import <Foundation/Foundation.h>
#import "lib.h"

extern Foo * func();

int main() {
Foo * f = func();
return 0;
}

#--- lib.m
#import <Foundation/Foundation.h>
#import "lib.h"

@implementation Foo {
int i;
}

- (id)init {
self->i = 1;
self->y = 2;

return self;
}
@end

Foo * func() {
return [[Foo alloc] init];
}

#--- lib.h
#ifndef LIB_H_IN
#define LIB_H_IN

#import <Foundation/Foundation.h>

@interface Foo : NSObject {
int y;
}
@end

#endif // _H_IN
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