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#
#
# The Nim Compiler
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module implements the passes functionality. A pass must implement the
## `TPass` interface.
import
strutils, options, ast, astalgo, llstream, msgs, platform, os,
condsyms, idents, renderer, types, extccomp, math, magicsys, nversion,
nimsets, syntaxes, times, rodread, idgen, modulegraphs, reorder, rod,
configuration
type
TPassContext* = object of RootObj # the pass's context
rd*: PRodReader # != nil if created by "openCached"
PPassContext* = ref TPassContext
TPassOpen* = proc (graph: ModuleGraph; module: PSym; cache: IdentCache): PPassContext {.nimcall.}
TPassOpenCached* =
proc (graph: ModuleGraph; module: PSym, rd: PRodReader): PPassContext {.nimcall.}
TPassClose* = proc (graph: ModuleGraph; p: PPassContext, n: PNode): PNode {.nimcall.}
TPassProcess* = proc (p: PPassContext, topLevelStmt: PNode): PNode {.nimcall.}
TPass* = tuple[open: TPassOpen, openCached: TPassOpenCached,
process: TPassProcess, close: TPassClose,
isFrontend: bool]
TPassData* = tuple[input: PNode, closeOutput: PNode]
TPasses* = openArray[TPass]
# a pass is a tuple of procedure vars ``TPass.close`` may produce additional
# nodes. These are passed to the other close procedures.
# This mechanism used to be used for the instantiation of generics.
proc makePass*(open: TPassOpen = nil,
openCached: TPassOpenCached = nil,
process: TPassProcess = nil,
close: TPassClose = nil,
isFrontend = false): TPass =
result.open = open
result.openCached = openCached
result.close = close
result.process = process
result.isFrontend = isFrontend
# the semantic checker needs these:
var
gImportModule*: proc (graph: ModuleGraph; m: PSym, fileIdx: FileIndex; cache: IdentCache): PSym {.nimcall.}
gIncludeFile*: proc (graph: ModuleGraph; m: PSym, fileIdx: FileIndex; cache: IdentCache): PNode {.nimcall.}
# implementation
proc skipCodegen*(config: ConfigRef; n: PNode): bool {.inline.} =
# can be used by codegen passes to determine whether they should do
# something with `n`. Currently, this ignores `n` and uses the global
# error count instead.
result = config.errorCounter > 0
const
maxPasses = 10
type
TPassContextArray = array[0..maxPasses - 1, PPassContext]
var
gPasses: array[0..maxPasses - 1, TPass]
gPassesLen*: int
proc clearPasses* =
gPassesLen = 0
proc registerPass*(p: TPass) =
gPasses[gPassesLen] = p
inc(gPassesLen)
proc carryPass*(g: ModuleGraph; p: TPass, module: PSym; cache: IdentCache;
m: TPassData): TPassData =
var c = p.open(g, module, cache)
result.input = p.process(c, m.input)
result.closeOutput = if p.close != nil: p.close(g, c, m.closeOutput)
else: m.closeOutput
proc carryPasses*(g: ModuleGraph; nodes: PNode, module: PSym;
cache: IdentCache; passes: TPasses) =
var passdata: TPassData
passdata.input = nodes
for pass in passes:
passdata = carryPass(g, pass, module, cache, passdata)
proc openPasses(g: ModuleGraph; a: var TPassContextArray;
module: PSym; cache: IdentCache) =
for i in countup(0, gPassesLen - 1):
if not isNil(gPasses[i].open):
a[i] = gPasses[i].open(g, module, cache)
else: a[i] = nil
proc openPassesCached(g: ModuleGraph; a: var TPassContextArray, module: PSym,
rd: PRodReader) =
for i in countup(0, gPassesLen - 1):
if not isNil(gPasses[i].openCached):
a[i] = gPasses[i].openCached(g, module, rd)
if a[i] != nil:
a[i].rd = rd
else:
a[i] = nil
proc closePasses(graph: ModuleGraph; a: var TPassContextArray) =
var m: PNode = nil
for i in countup(0, gPassesLen - 1):
if not isNil(gPasses[i].close): m = gPasses[i].close(graph, a[i], m)
a[i] = nil # free the memory here
proc processTopLevelStmt(n: PNode, a: var TPassContextArray): bool =
# this implements the code transformation pipeline
var m = n
for i in countup(0, gPassesLen - 1):
if not isNil(gPasses[i].process):
m = gPasses[i].process(a[i], m)
if isNil(m): return false
result = true
proc processTopLevelStmtCached(n: PNode, a: var TPassContextArray) =
# this implements the code transformation pipeline
var m = n
for i in countup(0, gPassesLen - 1):
if not isNil(gPasses[i].openCached): m = gPasses[i].process(a[i], m)
proc closePassesCached(graph: ModuleGraph; a: var TPassContextArray) =
var m: PNode = nil
for i in countup(0, gPassesLen - 1):
if not isNil(gPasses[i].openCached) and not isNil(gPasses[i].close):
m = gPasses[i].close(graph, a[i], m)
a[i] = nil # free the memory here
proc resolveMod(conf: ConfigRef; module, relativeTo: string): FileIndex =
let fullPath = findModule(conf, module, relativeTo)
if fullPath.len == 0:
result = InvalidFileIDX
else:
result = fileInfoIdx(conf, fullPath)
proc processImplicits(conf: ConfigRef; implicits: seq[string], nodeKind: TNodeKind,
a: var TPassContextArray; m: PSym) =
# XXX fixme this should actually be relative to the config file!
let gCmdLineInfo = newLineInfo(FileIndex(0), 1, 1)
let relativeTo = m.info.toFullPath
for module in items(implicits):
# implicit imports should not lead to a module importing itself
if m.position != resolveMod(conf, module, relativeTo).int32:
var importStmt = newNodeI(nodeKind, gCmdLineInfo)
var str = newStrNode(nkStrLit, module)
str.info = gCmdLineInfo
importStmt.addSon str
if not processTopLevelStmt(importStmt, a): break
proc processModule*(graph: ModuleGraph; module: PSym, stream: PLLStream,
rd: PRodReader; cache: IdentCache): bool {.discardable.} =
if graph.stopCompile(): return true
var
p: TParsers
a: TPassContextArray
s: PLLStream
fileIdx = module.fileIdx
if module.id < 0:
# new module caching mechanism:
for i in 0..<gPassesLen:
if not isNil(gPasses[i].open) and not gPasses[i].isFrontend:
a[i] = gPasses[i].open(graph, module, cache)
else:
a[i] = nil
var stmtIndex = 0
var doContinue = true
while doContinue:
let n = loadNode(module, stmtIndex)
if n == nil or graph.stopCompile(): break
#if n.kind == nkImportStmt:
# echo "yes and it's ", n
inc stmtIndex
var m = n
for i in 0..<gPassesLen:
if not isNil(gPasses[i].process) and not gPasses[i].isFrontend:
m = gPasses[i].process(a[i], m)
if isNil(m):
doContinue = false
break
var m: PNode = nil
for i in 0..<gPassesLen:
if not isNil(gPasses[i].close) and not gPasses[i].isFrontend:
m = gPasses[i].close(graph, a[i], m)
a[i] = nil
elif rd == nil:
openPasses(graph, a, module, cache)
if stream == nil:
let filename = fileIdx.toFullPathConsiderDirty
s = llStreamOpen(filename, fmRead)
if s == nil:
rawMessage(graph.config, errCannotOpenFile, filename)
return false
else:
s = stream
while true:
openParsers(p, fileIdx, s, cache, graph.config)
if sfSystemModule notin module.flags:
# XXX what about caching? no processing then? what if I change the
# modules to include between compilation runs? we'd need to track that
# in ROD files. I think we should enable this feature only
# for the interactive mode.
processImplicits graph.config, graph.config.implicitImports, nkImportStmt, a, module
processImplicits graph.config, graph.config.implicitIncludes, nkIncludeStmt, a, module
while true:
if graph.stopCompile(): break
var n = parseTopLevelStmt(p)
if n.kind == nkEmpty: break
if {sfNoForward, sfReorder} * module.flags != {}:
# read everything, no streaming possible
var sl = newNodeI(nkStmtList, n.info)
sl.add n
while true:
var n = parseTopLevelStmt(p)
if n.kind == nkEmpty: break
sl.add n
if sfReorder in module.flags:
sl = reorder(graph, sl, module, cache)
discard processTopLevelStmt(sl, a)
break
elif not processTopLevelStmt(n, a): break
closeParsers(p)
if s.kind != llsStdIn: break
closePasses(graph, a)
# id synchronization point for more consistent code generation:
idSynchronizationPoint(1000)
else:
openPassesCached(graph, a, module, rd)
var n = loadInitSection(rd)
for i in countup(0, sonsLen(n) - 1):
if graph.stopCompile(): break
processTopLevelStmtCached(n.sons[i], a)
closePassesCached(graph, a)
result = true
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