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##[
Utilities to help with debugging nim compiler.
Experimental API, subject to change.
]##
#[
## example
useful debugging flags:
--stacktrace -d:debug -d:nimDebugUtils
nim c -o:bin/nim_temp --stacktrace -d:debug -d:nimDebugUtils compiler/nim
## future work
* expose and improve astalgo.debug, replacing it by std/prettyprints,
refs https://github.com/nim-lang/RFCs/issues/385
]#
import options
import std/wrapnils
export wrapnils
# allows using things like: `?.n.sym.typ.len`
import std/stackframes
export stackframes
# allows using things like: `setFrameMsg c.config$n.info & " " & $n.kind`
# which doesn't log, but augments stacktrace with side channel information
var conf0: ConfigRef
proc onNewConfigRef*(conf: ConfigRef) {.inline.} =
## Caches `conf`, which can be retrieved with `getConfigRef`.
## This avoids having to forward `conf` all the way down the call chain to
## procs that need it during a debugging session.
conf0 = conf
proc getConfigRef*(): ConfigRef =
## nil, if -d:nimDebugUtils wasn't specified
result = conf0
proc isCompilerDebug*(): bool =
##[
Provides a simple way for user code to enable/disable logging in the compiler
in a granular way. This can then be used in the compiler as follows:
```nim
if isCompilerDebug():
echo ?.n.sym.typ.len
```
]##
runnableExamples:
proc main =
echo 2
{.define(nimCompilerDebug).}
echo 3.5 # code section in which `isCompilerDebug` will be true
{.undef(nimCompilerDebug).}
echo 'x'
conf0.isDefined("nimCompilerDebug")
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