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#
#
# The Nim Compiler
# (c) Copyright 2017 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## 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 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
## checking) for E but we don't want to recompile depending
## modules right away for faster turnaround times. Instead we mark the module's
## dependencies as 'dirty'. Let D be a dependency of E. If D is dirty, we
## need to recompile it and all of its dependencies that are marked as 'dirty'.
## 'nimsuggest sug' actually is invoked for the file being edited so we know
## its content changed and there is no need to compute any checksums.
## Instead of a recursive algorithm, we use an iterative algorithm:
##
## - If a module gets recompiled, its dependencies need to be updated.
## - Its dependent module stays the same.
##
import ast, intsets, tables, options, lineinfos, hashes, idents,
incremental, btrees
type
ModuleGraph* = ref object
modules*: seq[PSym] ## indexed by int32 fileIdx
packageSyms*: TStrTable
deps*: IntSet # the dependency graph or potentially its transitive closure.
suggestMode*: bool # whether we are in nimsuggest mode or not.
invalidTransitiveClosure: bool
inclToMod*: Table[FileIndex, FileIndex] # mapping of include file to the
# first module that included it
importStack*: seq[FileIndex] # The current import stack. Used for detecting recursive
# module dependencies.
backend*: RootRef # minor hack so that a backend can extend this easily
config*: ConfigRef
cache*: IdentCache
vm*: RootRef # unfortunately the 'vm' state is shared project-wise, this will
# be clarified in later compiler implementations.
doStopCompile*: proc(): bool {.closure.}
usageSym*: PSym # for nimsuggest
owners*: seq[PSym]
methods*: seq[tuple[methods: TSymSeq, dispatcher: PSym]] # needs serialization!
systemModule*: PSym
sysTypes*: array[TTypeKind, PType]
compilerprocs*: TStrTable
exposed*: TStrTable
intTypeCache*: array[-5..64, PType]
opContains*, opNot*: PSym
emptyNode*: PNode
incr*: IncrementalCtx
importModuleCallback*: proc (graph: ModuleGraph; m: PSym, fileIdx: FileIndex): PSym {.nimcall.}
includeFileCallback*: proc (graph: ModuleGraph; m: PSym, fileIdx: FileIndex): PNode {.nimcall.}
recordStmt*: proc (graph: ModuleGraph; m: PSym; n: PNode) {.nimcall.}
cacheSeqs*: Table[string, PNode] # state that is shared to suppor the 'macrocache' API
cacheCounters*: Table[string, BiggestInt]
cacheTables*: Table[string, BTree[string, PNode]]
proc hash*(x: FileIndex): Hash {.borrow.}
proc stopCompile*(g: ModuleGraph): bool {.inline.} =
result = g.doStopCompile != nil and g.doStopCompile()
proc createMagic*(g: ModuleGraph; name: string, m: TMagic): PSym =
result = newSym(skProc, getIdent(g.cache, name), nil, unknownLineInfo(), {})
result.magic = m
proc newModuleGraph*(cache: IdentCache; config: ConfigRef): ModuleGraph =
result = ModuleGraph()
initStrTable(result.packageSyms)
result.deps = initIntSet()
result.modules = @[]
result.importStack = @[]
result.inclToMod = initTable[FileIndex, FileIndex]()
result.config = config
result.cache = cache
result.owners = @[]
result.methods = @[]
initStrTable(result.compilerprocs)
initStrTable(result.exposed)
result.opNot = createMagic(result, "not", mNot)
result.opContains = createMagic(result, "contains", mInSet)
result.emptyNode = newNode(nkEmpty)
init(result.incr)
result.recordStmt = proc (graph: ModuleGraph; m: PSym; n: PNode) {.nimcall.} =
discard
result.cacheSeqs = initTable[string, PNode]()
result.cacheCounters = initTable[string, BiggestInt]()
result.cacheTables = initTable[string, BTree[string, PNode]]()
proc resetAllModules*(g: ModuleGraph) =
initStrTable(g.packageSyms)
g.deps = initIntSet()
g.modules = @[]
g.importStack = @[]
g.inclToMod = initTable[FileIndex, FileIndex]()
g.usageSym = nil
g.owners = @[]
g.methods = @[]
initStrTable(g.compilerprocs)
initStrTable(g.exposed)
proc getModule*(g: ModuleGraph; fileIdx: FileIndex): PSym =
if fileIdx.int32 >= 0 and fileIdx.int32 < g.modules.len:
result = g.modules[fileIdx.int32]
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(g.incr, g.config, m.info.fileIndex, dep, isIncludeFile = false)
if g.suggestMode:
g.deps.incl m.position.dependsOn(dep.int)
# we compute the transitive closure later when quering the graph lazily.
# this improves efficiency quite a lot:
#invalidTransitiveClosure = true
proc addIncludeDep*(g: ModuleGraph; module, includeFile: FileIndex) =
addModuleDep(g.incr, g.config, module, includeFile, isIncludeFile = true)
discard hasKeyOrPut(g.inclToMod, includeFile, module)
proc parentModule*(g: ModuleGraph; fileIdx: FileIndex): FileIndex =
## returns 'fileIdx' if the file belonging to this index is
## directly used as a module or else the module that first
## references this include file.
if fileIdx.int32 >= 0 and fileIdx.int32 < g.modules.len and g.modules[fileIdx.int32] != nil:
result = fileIdx
else:
result = g.inclToMod.getOrDefault(fileIdx)
proc transitiveClosure(g: var IntSet; n: int) =
# warshall's algorithm
for k in 0..<n:
for i in 0..<n:
for j in 0..<n:
if i != j and not g.contains(i.dependsOn(j)):
if g.contains(i.dependsOn(k)) and g.contains(k.dependsOn(j)):
g.incl i.dependsOn(j)
proc markDirty*(g: ModuleGraph; fileIdx: FileIndex) =
let m = g.getModule fileIdx
if m != nil: incl m.flags, sfDirty
proc markClientsDirty*(g: ModuleGraph; fileIdx: FileIndex) =
# we need to mark its dependent modules D as dirty right away because after
# nimsuggest is done with this module, the module's dirty flag will be
# cleared but D still needs to be remembered as 'dirty'.
if g.invalidTransitiveClosure:
g.invalidTransitiveClosure = false
transitiveClosure(g.deps, g.modules.len)
# every module that *depends* on this file is also dirty:
for i in 0i32..<g.modules.len.int32:
let m = g.modules[i]
if m != nil and g.deps.contains(i.dependsOn(fileIdx.int)):
incl m.flags, sfDirty
proc isDirty*(g: ModuleGraph; m: PSym): bool =
result = g.suggestMode and sfDirty in m.flags
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