[PATCH v3 00/18] clang-tools support in tools

[Ian Rogers]

Allow the clang-tools scripts to work with builds in tools such as
tools/perf and tools/lib/perf. An example use looks like:

```
$ cd tools/perf
$ make CC=clang CXX=clang++
$ ../../scripts/clang-tools/gen_compile_commands.py
$ ../../scripts/clang-tools/run-clang-tools.py clang-tidy compile_commands.json -checks=-*,readability-named-parameter
Skipping non-C file: 'tools/perf/bench/mem-memcpy-x86-64-asm.S'
Skipping non-C file: 'tools/perf/bench/mem-memset-x86-64-asm.S'
Skipping non-C file: 'tools/perf/arch/x86/tests/regs_load.S'
8 warnings generated.
Suppressed 8 warnings (8 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
tools/perf/util/parse-events-flex.c:546:27: warning: all parameters should be named in a function [readability-named-parameter]
void *yyalloc ( yy_size_t , yyscan_t yyscanner );
                          ^
                           /*size*/
...
```

Fix a number of the more serious low-hanging issues in perf found by
clang-tidy.

This support isn't complete, in particular it doesn't support output
directories properly and so fails for tools/lib/bpf, tools/bpf/bpftool
and if an output directory is used.

v3. Add Nick Desaulniers reviewed-by to patch 3. For Namhyung, drop
    "perf hisi-ptt: Fix potential memory leak", split lock change out
    of "perf svghelper: Avoid memory leak" and address comments in
    "perf header: Fix various error path memory leaks".
v2: Address comments by Nick Desaulniers in patch 3, and add their
    Reviewed-by to patches 1 and 2.

Ian Rogers (18):
  gen_compile_commands: Allow the line prefix to still be cmd_
  gen_compile_commands: Sort output compile commands by file name
  run-clang-tools: Add pass through checks and header-filter arguments
  perf bench uprobe: Fix potential use of memory after free
  perf buildid-cache: Fix use of uninitialized value
  perf env: Remove unnecessary NULL tests
  perf jitdump: Avoid memory leak
  perf mem-events: Avoid uninitialized read
  perf dlfilter: Be defensive against potential NULL dereference
  perf hists browser: Reorder variables to reduce padding
  perf hists browser: Avoid potential NULL dereference
  perf svghelper: Avoid memory leak
  perf lock: Fix a memory leak on an error path
  perf parse-events: Fix unlikely memory leak when cloning terms
  tools api: Avoid potential double free
  perf trace-event-info: Avoid passing NULL value to closedir
  perf header: Fix various error path memory leaks
  perf bpf_counter: Fix a few memory leaks

 scripts/clang-tools/gen_compile_commands.py |  8 +--
 scripts/clang-tools/run-clang-tools.py      | 32 ++++++++---
 tools/lib/api/io.h                          |  1 +
 tools/perf/bench/uprobe.c                   |  1 +
 tools/perf/builtin-buildid-cache.c          |  6 ++-
 tools/perf/builtin-lock.c                   |  1 +
 tools/perf/ui/browsers/hists.c              |  6 +--
 tools/perf/util/bpf_counter.c               |  5 +-
 tools/perf/util/dlfilter.c                  |  4 +-
 tools/perf/util/env.c                       |  6 +--
 tools/perf/util/header.c                    | 60 ++++++++++++---------
 tools/perf/util/jitdump.c                   |  1 +
 tools/perf/util/mem-events.c                |  3 +-
 tools/perf/util/parse-events.c              |  4 +-
 tools/perf/util/svghelper.c                 |  5 +-
 tools/perf/util/trace-event-info.c          |  3 +-
 16 files changed, 94 insertions(+), 52 deletions(-)

-- 
2.42.0.609.gbb76f46606-goog