https://llvm.org/bugs/show_bug.cgi?id=23326
Bug ID: 23326
Summary: Output from stack-list-locals and stack-list-arguments
MI commands missing type information
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@cs.uiuc.edu
Reporter: vadim.maca...@gmail.com
Classification: Unclassified
Created attachment 14248
--> https://llvm.org/bugs/attachment.cgi?id=14248&action=edit
Source for test executable
The stack-list-locals and stack-list-arguments MI commands have three output
modes, described as follows:
[0|--no-values] - Only variable/argument names are output.
[1|--all-values] - Variable/argument names and values are output.
[2|--simple-values] - Variable/argument names, values, and types are output for
simple types, but only names and types are output for complex types (like
arrays, structs, unions, etc.)
Full descriptions of these MI commands are available at
<https://sourceware.org/gdb/onlinedocs/gdb/GDB_002fMI-Stack-Manipulation.html#GDB_002fMI-Stack-Manipulation>
It is the --simple-values output mode that hasn't been implemented properly in
the LLDB MI driver, no type information is output at all. Here's an example of
what GDB and LLDB output for the '-stack-list-arguments --simple-values'
command:
GDB-MI:
^done,stack-args=[frame={level="0",args=[]},frame={level="1",args=[]},frame={level="2",args=[{name="argc",type="int",value="1"},{name="argv",type="const
char **",value="0x7fffffffde68"}]}]
LLDB-MI:
^done,stack-args=[frame={level="0",args=[]},frame={level="1",args=[]},frame={level="2",args=[{name="argc",value="1"},{name="argv",value="0x00007fffffffee58"}]}]
And here's an example of what GDB and LLDB output for the '-stack-list-locals
--simple-values' command:
GDB-MI:
^done,locals=[{name="e",type="Point"},{name="f",type="float",value="9.5"},{name="g",type="long",value="300"}]
LLDB-MI:
^done,locals=[name="e",{name="f",value="9.5"},{name="g",value="300"}]
Note that aside from missing type information in the LLDB-MI response above,
it's not even grammatically correct, according to the 'list' rule a list
delimited by [] should either contain only results (key=value), or only values.
In this case the grammatically correct output would've been:
^done,locals=[{name="e"},{name="f",value="9.5"},{name="g",value="300"}]
I've attached the source file I've used to produce the example output in this
bug report, once built in debug mode the following MI commands can be used to
reproduce the examples in GDB (gdb --interperter mi) or LLDB (lldb-mi
--interperter):
-file-exec-and-symbols path/to/test_target
-break-insert funcWithThreeLocalVariables_Inner
-exec-run
-stack-list-arguments 2
-stack-list-locals --frame 1 --thread 1 2
Note that LLDB outputs a couple of extra frames for stack-list-arguments that
I've omitted from the example output above.
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