https://llvm.org/bugs/show_bug.cgi?id=27651
Bug ID: 27651
Summary: Link will change global value order
Product: libraries
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Linker
Assignee: unassignedb...@nondot.org
Reporter: xiuli...@outlook.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
We are using a module as library and link the source code in the library and
when the source code has some blocks there are some bugs with the global value.
In debug version the ~Module will assert.
Here is llvm ir for global values before link and after link:
Before link:
@_NSConcreteGlobalBlock = external global i8*
@.str = private unnamed_addr addrspace(2) constant [9 x i8] c"i12@?0i8\00",
align 1
@__block_descriptor_tmp = internal constant { i64, i64, i8 addrspace(2)*, i8
addrspace(2)* } { i64 0, i64 32, i8 addrspace(2)* getelementptr inbounds ([9 x
i8], [9 x i8] addrspace(2)* @.str, i32 0, i32 0), i8 addrspace(2)* null }
@__block_literal_global = internal constant { i8**, i32, i32, i8*,
%struct.__block_descriptor* } { i8** @_NSConcreteGlobalBlock, i32 1342177280,
i32 0, i8* bitcast (i32 (i8*, i32)* @__test_block_invoke to i8*),
%struct.__block_descriptor* bitcast ({ i64, i64, i8 addrspace(2)*, i8
addrspace(2)* }* @__block_descriptor_tmp to %struct.__block_descriptor*) },
align 8
After link:
@__block_literal_global = internal constant { i8**, i32, i32, i8*,
%struct.__block_descriptor* } { i8** @_NSConcreteGlobalBlock, i32 1342177280,
i32 0, i8* bitcast (i32 (i8*, i32)* @__test_block_invoke to i8*),
%struct.__block_descriptor* bitcast ({ i64, i64, i8 addrspace(2)*, i8
addrspace(2)* }* @__block_descriptor_tmp to %struct.__block_descriptor*) },
align 8
@_NSConcreteGlobalBlock = external global i8*
@__block_descriptor_tmp = internal constant { i64, i64, i8 addrspace(2)*, i8
addrspace(2)* } { i64 0, i64 32, i8 addrspace(2)* getelementptr inbounds ([9 x
i8], [9 x i8] addrspace(2)* @.str, i32 0, i32 0), i8 addrspace(2)* null }
@.str = private unnamed_addr addrspace(2) constant [9 x i8] c"i12@?0i8\00",
align 1
As the global valve orders change, the dependency of these global values are
messed.
It seems the bug was caused by ModuleLinker::linkIfNeeded with a recursion call
but with a wrong order.
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