jingham added a comment.
In D65646#1612436 <https://reviews.llvm.org/D65646#1612436>, @aprantl wrote:
> I have a question based on my half-knowledge about the expression evaluator:
> I thought that we already wrote out a temporary file for the expression in
> order to support `expr -g`? Is this orthogonal or do we now have to ways of
> pretending there is a source file backing up the expression?
The file creation happens a little above the change to pass in a memory file:
// We also want a real file on disk if we generate full debug info.
should_create_file |= m_compiler->getCodeGenOpts().getDebugInfo() ==
codegenoptions::FullDebugInfo;
around line 891. Raphael's change doesn't change whether we emit this source
file or not.
But it seem weird that this will make every expression seem to come from the
same file and line. It would be really nice to be able to set breakpoints in
compiled expressions, but if all the files think they have the same source file
& starting line, this will be harder to get working.
Note, however, the creation of the source file & tracing back from the
debug_line that we insert when we JIT the expression to this source file seems
broken, however. If I do:
(lldb) expr --top-level -- int $foo(int) { (int) printf("I am here.\n"); }
(lldb) b s -n printf
Breakpoint 3: where = libsystem_c.dylib`printf, address = 0x00007fff616588ec
(lldb) expr -i 0 -- $foo(10)
1 location added to breakpoint 2
error: Execution was interrupted, reason: breakpoint 2.1.
The process has been left at the point where it was interrupted, use "thread
return -x" to return to the state before expression evaluation.
Process 3708 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
frame #0: 0x0000000100104b1b $__lldb_expr1`$foo(int) at Parse:1
Target 0: (something) stopped.
I should have seen the source code for $foo, but we don't seem to have found
the file. So something is broken in this process.
Repository:
rLLDB LLDB
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