[lldb-dev] Patch to fix REPL for ARMv7 & ARMv6 on linux

William Dillon via lldb-dev lldb-dev at lists.llvm.org
Wed Jan 6 13:37:24 PST 2016

Hi All,

There is a small change that enables correct calculation of arm sub architectures while using the REPL on arm-linux.  As you may of may or may not know, linux appends ā€˜lā€™ to arm architecture versions to denote little endian.  This sometimes interferes with the determination of the architecture in the triple.  I experimented with adding sub architecture entries for these within lldb, but I discovered a simpler (and less invasive) method.  Because LLVM already knows how to handle some of these cases (I have a patch submitted for review that enables v6l; v7l already works), I am relying on llvm to clean it up.  The gist of it is that the llvm constructor (when given a triple string) retains the provided string unless an accessor mutates it.  Meanwhile, the accessors for the components go through the aliasing and parsing logic.  This code detects whether the sub-architecture that armv6l or armv7l aliases to is detected, and re-sets the architecture in the triple.  This overwrites the architecture that comes from linux, thus sanitizing it.

Some kind of solution is required for the REPL to on arm-linux.

- Will

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