patch library: call init

cl/compile.go

@@ -100,13 +100,21 @@ type context struct {
 	inits []func()
 	phis  []func()
 
+	state   pkgState
 	inCFunc bool
 	skipall bool
-	hasPatch bool
 }
 
+type pkgState byte
+
+const (
+	pkgNormal pkgState = iota
+	pkgHasPatch
+	pkgInPatch
+)
+
 func (p *context) inMain(instr ssa.Instruction) bool {
-	return instr.Parent().Name() == "main"
+	return p.fn.Name() == "main"
 }
 
 func (p *context) compileType(pkg llssa.Package, t *ssa.Type) {
@@ -186,6 +194,7 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 	}
 
 	var isInit bool
+	var state = p.state
 	var sig = f.Signature
 	var hasCtx = len(f.FreeVars) > 0
 	if hasCtx {
@@ -208,6 +217,8 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 			ret := types.NewParam(token.NoPos, pkgTypes, "", p.prog.CInt().RawType())
 			results := types.NewTuple(ret)
 			sig = types.NewSignatureType(nil, nil, nil, params, results, false)
+		} else if isInit && state == pkgHasPatch {
+			name = initFnNameOfHasPatch(name)
 		}
 		fn = pkg.NewFuncEx(name, sig, llssa.Background(ftype), hasCtx)
 	}
@@ -219,6 +230,7 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 		}
 		p.inits = append(p.inits, func() {
 			p.fn = fn
+			p.state = state // restore pkgState when compiling funcBody
 			defer func() {
 				p.fn = nil
 			}()
@@ -263,8 +275,9 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 	var pyModInit bool
 	var prog = p.prog
 	var pkg = p.pkg
+	var fn = p.fn
 	var instrs = block.Instrs[n:]
-	var ret = p.fn.Block(block.Index)
+	var ret = fn.Block(block.Index)
 	b.SetBlock(ret)
 	if doModInit {
 		if pyModInit = p.pyMod != ""; pyModInit {
@@ -277,7 +290,6 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 			})
 		}
 	} else if doMainInit {
-		fn := p.fn
 		argc := pkg.NewVar("__llgo_argc", types.NewPointer(types.Typ[types.Int32]), llssa.InC)
 		argv := pkg.NewVar("__llgo_argv", types.NewPointer(argvTy), llssa.InC)
 		argc.InitNil()
@@ -287,7 +299,12 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 		callRuntimeInit(b, pkg)
 		b.Call(pkg.FuncOf("main.init").Expr)
 	}
-	for _, instr := range instrs {
+	for i, instr := range instrs {
+		if i == 1 && doModInit && p.state == pkgInPatch {
+			initFnNameOld := initFnNameOfHasPatch(p.fn.Name())
+			fnOld := pkg.NewFunc(initFnNameOld, llssa.NoArgsNoRet, llssa.InC)
+			b.Call(fnOld.Expr)
+		}
 		p.compileInstr(b, instr)
 	}
 	if pyModInit {
@@ -298,7 +315,7 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 		modPtr := pkg.PyNewModVar(modName, true).Expr
 		mod := b.Load(modPtr)
 		cond := b.BinOp(token.NEQ, mod, prog.Nil(mod.Type))
-		newBlk := p.fn.MakeBlock()
+		newBlk := fn.MakeBlock()
 		b.If(cond, jumpTo, newBlk)
 		b.SetBlockEx(newBlk, llssa.AtEnd, false)
 		b.Store(modPtr, b.PyImportMod(modPath))
@@ -755,11 +772,12 @@ func NewPackageEx(prog llssa.Program, patches Patches, pkg *ssa.Package, files [
 	if hasPatch {
 		skips := ctx.skips
 		ctx.skips = nil
+		ctx.state = pkgInPatch
 		processPkg(ctx, ret, alt)
+		ctx.state = pkgHasPatch
 		ctx.skips = skips
 	}
 	if !ctx.skipall {
-		ctx.hasPatch = hasPatch
 		processPkg(ctx, ret, pkg)
 	}
 	for len(ctx.inits) > 0 {
@@ -772,11 +790,9 @@ func NewPackageEx(prog llssa.Program, patches Patches, pkg *ssa.Package, files [
 	return
 }
 
-/* TODO(xsw):
-func inPatch(ctx *context) bool {
-	return ctx.skips == nil
+func initFnNameOfHasPatch(name string) string {
+	return name + "$hasPatch"
 }
-*/
 
 func processPkg(ctx *context, ret llssa.Package, pkg *ssa.Package) {
 	type namedMember struct {

ssa/decl.go

@@ -234,12 +234,10 @@ func newParams(fn Type, prog Program) (params []Type, hasVArg bool) {
 	return
 }
 
-/*
 // Name returns the function's name.
 func (p Function) Name() string {
 	return p.impl.Name()
 }
-*/
 
 // Params returns the function's ith parameter.
 func (p Function) Param(i int) Expr {