https://bugs.llvm.org/show_bug.cgi?id=46183
Bug ID: 46183
Summary: Reading block address array from LLVM assembly file
changes the target block
Product: new-bugs
Version: 10.0
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: timothy.werq...@guardsquare.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 23569
--> https://bugs.llvm.org/attachment.cgi?id=23569&action=edit
The LLVM assembly file that reproduces the issue
I have an LLVM assembly file which will be read incorrectly by LLVM.
The array of block addresses `bbAdresses` contains several targets in the main
function. But when read by llvm-as and then disassembled by llvm-dis, all
elements of the array will point to the unnamed basic block.
So just doing `llvm-as -o - broken.ll | llvm-dis -o -` will output the
incorrect array.
When compiling the file using `clang` it will produce an infinite loop as the
targets of all indirect branches have been changed to the same basic block.
I tested using both the brew clang-8 toolchain and the default Apple clang
version 11.0.0
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