| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
DynamicLoading
Description
Dynamically lookup up values from modules and loading them.
Synopsis
- initializePlugins :: HscEnv -> DynFlags -> IO DynFlags
- loadFrontendPlugin :: HscEnv -> ModuleName -> IO FrontendPlugin
- forceLoadModuleInterfaces :: HscEnv -> SDoc -> [Module] -> IO ()
- forceLoadNameModuleInterface :: HscEnv -> SDoc -> Name -> IO ()
- forceLoadTyCon :: HscEnv -> Name -> IO TyCon
- lookupRdrNameInModuleForPlugins :: HscEnv -> ModuleName -> RdrName -> IO (Maybe (Name, ModIface))
- getValueSafely :: HscEnv -> Name -> Type -> IO (Maybe a)
- getHValueSafely :: HscEnv -> Name -> Type -> IO (Maybe HValue)
- lessUnsafeCoerce :: DynFlags -> String -> a -> IO b
Documentation
initializePlugins :: HscEnv -> DynFlags -> IO DynFlags Source #
Loads the plugins specified in the pluginModNames field of the dynamic flags. Should be called after command line arguments are parsed, but before actual compilation starts. Idempotent operation. Should be re-called if pluginModNames or pluginModNameOpts changes.
Loading plugins
loadFrontendPlugin :: HscEnv -> ModuleName -> IO FrontendPlugin Source #
Force loading information
forceLoadModuleInterfaces :: HscEnv -> SDoc -> [Module] -> IO () Source #
Force the interfaces for the given modules to be loaded. The SDoc parameter is used
for debugging (-ddump-if-trace) only: it is shown as the reason why the module is being loaded.
forceLoadNameModuleInterface :: HscEnv -> SDoc -> Name -> IO () Source #
Force the interface for the module containing the name to be loaded. The SDoc parameter is used
for debugging (-ddump-if-trace) only: it is shown as the reason why the module is being loaded.
Finding names
lookupRdrNameInModuleForPlugins :: HscEnv -> ModuleName -> RdrName -> IO (Maybe (Name, ModIface)) Source #
Finds the Name corresponding to the given RdrName in the
context of the ModuleName. Returns Nothing if no such Name
could be found. Any other condition results in an exception:
- If the module could not be found
- If we could not determine the imports of the module
Can only be used for looking up names while loading plugins (and is *not* suitable for use within plugins). The interface file is loaded very partially: just enough that it can be used, without its rules and instances affecting (and being linked from!) the module being compiled. This was introduced by 57d6798.
Need the module as well to record information in the interface file
Loading values
getValueSafely :: HscEnv -> Name -> Type -> IO (Maybe a) Source #
Loads the value corresponding to a Name if that value has the given Type. This only provides limited safety
in that it is up to the user to ensure that that type corresponds to the type you try to use the return value at!
If the value found was not of the correct type, returns Nothing. Any other condition results in an exception:
- If we could not load the names module
- If the thing being loaded is not a value
- If the Name does not exist in the module
- If the link failed