refactoring: move DB model to incremental.nim

compiler/modulegraphs.nim

@@ -9,7 +9,7 @@
 
 ## This module implements the module graph data structure. The module graph
 ## represents a complete Nim project. Single modules can either be kept in RAM
-## or stored in a ROD file. The ROD file mechanism is not yet integrated here.
+## or stored in a Sqlite database.
 ##
 ## The caching of modules is critical for 'nimsuggest' and is tricky to get
 ## right. If module E is being edited, we need autocompletion (and type
@@ -25,7 +25,8 @@
 ## - Its dependent module stays the same.
 ##
 
-import ast, intsets, tables, options, rod, lineinfos, hashes, idents
+import ast, intsets, tables, options, lineinfos, hashes, idents,
+  incremental
 
 type
   ModuleGraph* = ref object
@@ -54,6 +55,7 @@ type
     intTypeCache*: array[-5..64, PType]
     opContains*, opNot*: PSym
     emptyNode*: PNode
+    incr*: IncrementalCtx
 
 proc hash*(x: FileIndex): Hash {.borrow.}
 
@@ -82,6 +84,7 @@ proc newModuleGraph*(cache: IdentCache; config: ConfigRef): ModuleGraph =
   result.opNot = createMagic(result, "not", mNot)
   result.opContains = createMagic(result, "contains", mInSet)
   result.emptyNode = newNode(nkEmpty)
+  init(result.incr)
 
 proc resetAllModules*(g: ModuleGraph) =
   initStrTable(packageSyms)
@@ -103,7 +106,7 @@ proc dependsOn(a, b: int): int {.inline.} = (a shl 15) + b
 
 proc addDep*(g: ModuleGraph; m: PSym, dep: FileIndex) =
   assert m.position == m.info.fileIndex.int32
-  addModuleDep(m.info.fileIndex, dep, isIncludeFile = false)
+  addModuleDep(g.incr, g.config, m.info.fileIndex, dep, isIncludeFile = false)
   if suggestMode:
     deps.incl m.position.dependsOn(dep.int)
     # we compute the transitive closure later when quering the graph lazily.
@@ -111,7 +114,7 @@ proc addDep*(g: ModuleGraph; m: PSym, dep: FileIndex) =
     #invalidTransitiveClosure = true
 
 proc addIncludeDep*(g: ModuleGraph; module, includeFile: FileIndex) =
-  addModuleDep(module, includeFile, isIncludeFile = true)
+  addModuleDep(g.incr, g.config, module, includeFile, isIncludeFile = true)
   discard hasKeyOrPut(inclToMod, includeFile, module)
 
 proc parentModule*(g: ModuleGraph; fileIdx: FileIndex): FileIndex =