https://llvm.org/bugs/show_bug.cgi?id=31674
Bug ID: 31674
Summary: ExtractGV externalizes private strings
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Interprocedural Optimizations
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: bigchees...@gmail.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Testcase:
$ cat test.ll
@.str.47 = private unnamed_addr constant [10 x i8] c"anonymous\00", align 1
define i32 @patatino(i8* nonnull %myptr) {
%blah = call i32 @strcmp(i8* nonnull %myptr, i8* getelementptr inbounds ([10
x i8], [10 x i8]* @.str.47, i64 0, i64 0))
ret i32 %blah
}
declare i32 @strcmp(i8* nocapture, i8* nocapture) local_unnamed_addr
$ ./llvm-extract patatino.ll -func=patatino -S
; ModuleID = 'patatino.ll'
source_filename = "patatino.ll"
@.str.47 = external hidden unnamed_addr constant [10 x i8], align 1
define i32 @patatino(i8* nonnull %myptr) {
%blah = call i32 @strcmp(i8* nonnull %myptr, i8* getelementptr inbounds ([10
x i8], [10 x i8]* @.str.47, i64 0, i64 0))
ret i32 %blah
}
declare i32 @strcmp(i8* nocapture, i8* nocapture) local_unnamed_addr
In the output, @.str.47 should be extracted (found out while reducing an
optimization bug and moving a given function to its own object file, and
observing a link failure because the private string was internalized and the
linker wasn't able to resolve the symbol).
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