diff options
| -rw-r--r-- | doc/developer-notes.md | 40 |
1 files changed, 16 insertions, 24 deletions
diff --git a/doc/developer-notes.md b/doc/developer-notes.md index 5f9c18f2f5..49f60c54ec 100644 --- a/doc/developer-notes.md +++ b/doc/developer-notes.md @@ -12,12 +12,13 @@ Developer Notes - [Development tips and tricks](#development-tips-and-tricks) - [Compiling for debugging](#compiling-for-debugging) - [Compiling for gprof profiling](#compiling-for-gprof-profiling) - - [debug.log](#debuglog) + - [`debug.log`](#debuglog) - [Testnet and Regtest modes](#testnet-and-regtest-modes) - [DEBUG_LOCKORDER](#debug_lockorder) - [Valgrind suppressions file](#valgrind-suppressions-file) - [Compiling for test coverage](#compiling-for-test-coverage) - [Performance profiling with perf](#performance-profiling-with-perf) + - [Sanitizers](#sanitizers) - [Locking/mutex usage notes](#lockingmutex-usage-notes) - [Threads](#threads) - [Ignoring IDE/editor files](#ignoring-ideeditor-files) @@ -63,7 +64,7 @@ tool to clean up patches automatically before submission. - Braces on the same line for everything else. - 4 space indentation (no tabs) for every block except namespaces. - No indentation for `public`/`protected`/`private` or for `namespace`. - - No extra spaces inside parenthesis; don't do ( this ). + - No extra spaces inside parenthesis; don't do `( this )`. - No space after function names; one space after `if`, `for` and `while`. - If an `if` only has a single-statement `then`-clause, it can appear on the same line as the `if`, without braces. In every other case, @@ -77,7 +78,7 @@ code. separate words (snake_case). - Class member variables have a `m_` prefix. - Global variables have a `g_` prefix. - - Constant names are all uppercase, and use `_` to separate words. + - Compile-time constant names are all uppercase, and use `_` to separate words. - Class names, function names, and method names are UpperCamelCase (PascalCase). Do not prefix class names with `C`. - Test suite naming convention: The Boost test suite in file @@ -208,15 +209,15 @@ produce better debugging builds. Run configure with the `--enable-gprof` option, then make. -### debug.log +### `debug.log` -If the code is behaving strangely, take a look in the debug.log file in the data directory; +If the code is behaving strangely, take a look in the `debug.log` file in the data directory; error and debugging messages are written there. The `-debug=...` command-line option controls debugging; running with just `-debug` or `-debug=1` will turn -on all categories (and give you a very large debug.log file). +on all categories (and give you a very large `debug.log` file). -The Qt code routes `qDebug()` output to debug.log under category "qt": run with `-debug=qt` +The Qt code routes `qDebug()` output to `debug.log` under category "qt": run with `-debug=qt` to see it. ### Testnet and Regtest modes @@ -234,7 +235,7 @@ Bitcoin Core is a multi-threaded application, and deadlocks or other multi-threading bugs can be very difficult to track down. The `--enable-debug` configure option adds `-DDEBUG_LOCKORDER` to the compiler flags. This inserts run-time checks to keep track of which locks are held and adds warnings to the -debug.log file if inconsistencies are detected. +`debug.log` file if inconsistencies are detected. ### Valgrind suppressions file @@ -276,8 +277,7 @@ the functional test framework. Perf can observe a running process and sample (at some frequency) where its execution is. Perf installation is contingent on which kernel version you're running; see -[this StackExchange -thread](https://askubuntu.com/questions/50145/how-to-install-perf-monitoring-tool) +[this thread](https://askubuntu.com/questions/50145/how-to-install-perf-monitoring-tool) for specific instructions. Certain kernel parameters may need to be set for perf to be able to inspect the @@ -312,7 +312,7 @@ or using a graphical tool like [Hotspot](https://github.com/KDAB/hotspot). See the functional test documentation for how to invoke perf within tests. -**Sanitizers** +### Sanitizers Bitcoin Core can be compiled with various "sanitizers" enabled, which add instrumentation for issues regarding things like memory safety, thread race @@ -373,7 +373,7 @@ Deadlocks due to inconsistent lock ordering (thread 1 locks `cs_main` and then `cs_wallet`, while thread 2 locks them in the opposite order: result, deadlock as each waits for the other to release its lock) are a problem. Compile with `-DDEBUG_LOCKORDER` (or use `--enable-debug`) to get lock order inconsistencies -reported in the debug.log file. +reported in the `debug.log` file. Re-architecting the core code so there are better-defined interfaces between the various components is a goal, with any necessary locking @@ -387,8 +387,6 @@ Threads - ThreadImport : Loads blocks from `blk*.dat` files or `-loadblock=<file>`. -- StartNode : Starts other threads. - - ThreadDNSAddressSeed : Loads addresses of peers from the DNS. - ThreadMapPort : Universal plug-and-play startup/shutdown. @@ -401,7 +399,7 @@ Threads - ThreadMessageHandler : Higher-level message handling (sending and receiving). -- DumpAddresses : Dumps IP addresses of nodes to peers.dat. +- DumpAddresses : Dumps IP addresses of nodes to `peers.dat`. - ThreadRPCServer : Remote procedure call handler, listens on port 8332 for connections and services them. @@ -467,11 +465,6 @@ Wallet - Make sure that no crashes happen with run-time option `-disablewallet`. - - *Rationale*: In RPC code that conditionally uses the wallet (such as - `validateaddress`), it is easy to forget that global pointer `pwalletMain` - can be nullptr. See `test/functional/disablewallet.py` for functional tests - exercising the API with `-disablewallet`. - - Include `db_cxx.h` (BerkeleyDB header) only when `ENABLE_WALLET` is set. - *Rationale*: Otherwise compilation of the disable-wallet build will fail in environments without BerkeleyDB. @@ -546,11 +539,10 @@ class A } ``` -- By default, declare single-argument constructors `explicit`. +- By default, declare constructors `explicit`. - - *Rationale*: This is a precaution to avoid unintended conversions that might - arise when single-argument constructors are used as implicit conversion - functions. + - *Rationale*: This is a precaution to avoid unintended + [conversions](https://en.cppreference.com/w/cpp/language/converting_constructor). - Use explicitly signed or unsigned `char`s, or even better `uint8_t` and `int8_t`. Do not use bare `char` unless it is to pass to a third-party API. |