compiler: make main function normally to compatible multiple main functions in testing mode

compiler/cl/cltest/cltest.go

@@ -152,10 +152,6 @@ func TestCompileEx(t *testing.T, src any, fname, expected string, dbg bool) {
 		t.Fatal("cl.NewPackage failed:", err)
 	}
 
-	if prog.NeedPyInit { // call PyInit if needed
-		ret.PyInit()
-	}
-
 	if v := ret.String(); v != expected && expected != ";" { // expected == ";" means skipping out.ll
 		t.Fatalf("\n==> got:\n%s\n==> expected:\n%s\n", v, expected)
 	}

compiler/cl/compile.go

@@ -127,10 +127,6 @@ const (
 	pkgFNoOldInit = 0x80 // flag if no initFnNameOld
 )
 
-func (p *context) inMain(instr ssa.Instruction) bool {
-	return p.fn.Name() == "main"
-}
-
 func (p *context) compileType(pkg llssa.Package, t *ssa.Type) {
 	tn := t.Object().(*types.TypeName)
 	if tn.IsAlias() { // don't need to compile alias type
@@ -186,10 +182,6 @@ func makeClosureCtx(pkg *types.Package, vars []*ssa.FreeVar) *types.Var {
 	return types.NewParam(token.NoPos, pkg, "__llgo_ctx", t)
 }
 
-var (
-	argvTy = types.NewPointer(types.NewPointer(types.Typ[types.Int8]))
-)
-
 func isCgoExternSymbol(f *ssa.Function) bool {
 	name := f.Name()
 	return isCgoCfunc(name) || isCgoCmacro(name)
@@ -247,14 +239,6 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 		}
 	}
 	if fn == nil {
-		if name == "main" {
-			argc := types.NewParam(token.NoPos, pkgTypes, "", types.Typ[types.Int32])
-			argv := types.NewParam(token.NoPos, pkgTypes, "", argvTy)
-			params := types.NewTuple(argc, argv)
-			ret := types.NewParam(token.NoPos, pkgTypes, "", p.prog.CInt().RawType())
-			results := types.NewTuple(ret)
-			sig = types.NewSignatureType(nil, nil, nil, params, results, false)
-		}
 		fn = pkg.NewFuncEx(name, sig, llssa.Background(ftype), hasCtx, f.Origin() != nil)
 		if debugSymbols {
 			fn.Inline(llssa.NoInline)
@@ -309,9 +293,8 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 			i := 0
 			for {
 				block := f.Blocks[i]
-				doMainInit := (i == 0 && name == "main")
 				doModInit := (i == 1 && isInit)
-				p.compileBlock(b, block, off[i], doMainInit, doModInit)
+				p.compileBlock(b, block, off[i], doModInit)
 				if isCgo {
 					// just process first block for performance
 					break
@@ -385,7 +368,7 @@ func (p *context) debugParams(b llssa.Builder, f *ssa.Function) {
 	}
 }
 
-func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, doMainInit, doModInit bool) llssa.BasicBlock {
+func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, doModInit bool) llssa.BasicBlock {
 	var last int
 	var pyModInit bool
 	var prog = p.prog
@@ -408,15 +391,6 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 				pkg.AfterInit(b, ret)
 			}
 		}
-	} else if doMainInit {
-		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()
-		argv.InitNil()
-		b.Store(argc.Expr, fn.Param(0))
-		b.Store(argv.Expr, fn.Param(1))
-		callRuntimeInit(b, pkg)
-		b.Call(pkg.FuncOf("main.init").Expr)
 	}
 	fnName := block.Parent().Name()
 	cgoReturned := false
@@ -499,11 +473,6 @@ const (
 	RuntimeInit = llssa.PkgRuntime + ".init"
 )
 
-func callRuntimeInit(b llssa.Builder, pkg llssa.Package) {
-	fn := pkg.NewFunc(RuntimeInit, llssa.NoArgsNoRet, llssa.InC) // don't need to convert runtime.init
-	b.Call(fn.Expr)
-}
-
 func isAny(t types.Type) bool {
 	if t, ok := t.Underlying().(*types.Interface); ok {
 		return t.Empty()
@@ -834,10 +803,6 @@ func (p *context) compileInstr(b llssa.Builder, instr ssa.Instruction) {
 				results[i] = p.compileValue(b, r)
 			}
 		}
-		if p.inMain(instr) {
-			results = make([]llssa.Expr, 1)
-			results[0] = p.prog.IntVal(0, p.prog.CInt())
-		}
 		b.Return(results...)
 	case *ssa.If:
 		fn := p.fn

compiler/internal/build/build.go

@@ -426,6 +426,11 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, linkArgs
 			}
 		}
 	})
+	main, err := genMainModuleFile(llssa.PkgRuntime, pkg.PkgPath, needRuntime, needPyInit)
+	if err != nil {
+		panic(err)
+	}
+	args = append(args, main)
 
 	var aPkg *aPackage
 	for _, v := range pkgs {
@@ -435,19 +440,9 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, linkArgs
 		}
 	}
 
-	dirty := false
+	args = append(args, linkArgs...)
-	if needRuntime {
-		args = append(args, linkArgs...)
-	} else {
-		dirty = true
-		fn := aPkg.LPkg.FuncOf(cl.RuntimeInit)
-		fn.MakeBody(1).Return()
-	}
-	if needPyInit {
-		dirty = aPkg.LPkg.PyInit()
-	}
 
-	if dirty && needLLFile(mode) {
+	if needLLFile(mode) {
 		lpkg := aPkg.LPkg
 		os.WriteFile(pkg.ExportFile, []byte(lpkg.String()), 0644)
 	}
@@ -475,7 +470,7 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, linkArgs
 	if verbose {
 		fmt.Fprintln(os.Stderr, "clang", args)
 	}
-	err := ctx.env.Clang().Exec(args...)
+	err = ctx.env.Clang().Exec(args...)
 	check(err)
 
 	if runtime.GOOS == "darwin" {
@@ -505,6 +500,60 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, linkArgs
 	}
 }
 
+func genMainModuleFile(rtPkgPath, mainPkgPath string, needRuntime, needPyInit bool) (path string, err error) {
+	var (
+		pyInitDecl string
+		pyInit     string
+		rtInitDecl string
+		rtInit     string
+	)
+	if needRuntime {
+		rtInit = "call void @\"" + rtPkgPath + ".init\"()"
+		rtInitDecl = "declare void @\"" + rtPkgPath + ".init\"()"
+	}
+	if needPyInit {
+		pyInit = "call void @Py_Initialize()"
+		pyInitDecl = "declare void @Py_Initialize()"
+	}
+	mainCode := fmt.Sprintf(`; ModuleID = 'main'
+source_filename = "main"
+
+@__llgo_argc = global i32 0, align 4
+@__llgo_argv = global ptr null, align 8
+
+%s
+%s
+declare void @"%s.init"()
+declare void @"%s.main"()
+
+define i32 @main(i32 %%0, ptr %%1) {
+_llgo_0:
+  %s
+  store i32 %%0, ptr @__llgo_argc, align 4
+  store ptr %%1, ptr @__llgo_argv, align 8
+  %s
+  call void @"%s.init"()
+  call void @"%s.main"()
+  ret i32 0
+}
+`, pyInitDecl, rtInitDecl, mainPkgPath, mainPkgPath,
+		pyInit, rtInit, mainPkgPath, mainPkgPath)
+
+	f, err := os.CreateTemp("", "main*.ll")
+	if err != nil {
+		return "", err
+	}
+	_, err = f.Write([]byte(mainCode))
+	if err != nil {
+		return "", err
+	}
+	err = f.Close()
+	if err != nil {
+		return "", err
+	}
+	return f.Name(), nil
+}
+
 func buildPkg(ctx *context, aPkg *aPackage, verbose bool) (cgoLdflags []string, err error) {
 	pkg := aPkg.Package
 	pkgPath := pkg.PkgPath

compiler/ssa/abi/abi.go

@@ -226,9 +226,6 @@ func PathOf(pkg *types.Package) string {
 	if pkg == nil {
 		return ""
 	}
-	if pkg.Name() == "main" {
-		return "main"
-	}
 	return strings.TrimPrefix(pkg.Path(), PatchPathPrefix)
 }
 

compiler/ssa/python.go

@@ -231,18 +231,6 @@ func (p Program) tyGetAttrString() *types.Signature {
 	return p.getAttrStr
 }
 
-// PyInit initializes Python for a main package.
-func (p Package) PyInit() bool {
-	if fn := p.FuncOf("main"); fn != nil {
-		b := fn.NewBuilder()
-		b.SetBlockEx(fn.Block(0), AtStart, false)
-		b.callPyInit()
-		b.Dispose()
-		return true
-	}
-	return false
-}
-
 // PyNewModVar creates a new global variable for a Python module.
 func (p Package) PyNewModVar(name string, doInit bool) Global {
 	if v, ok := p.pymods[name]; ok {

compiler/ssa/type.go

@@ -554,9 +554,6 @@ func FuncName(pkg *types.Package, name string, recv *types.Var, org bool) string
 		return PathOf(pkg) + "." + tName + "." + name
 	}
 	ret := FullName(pkg, name)
-	if ret == "main.main" {
-		ret = "main"
-	}
 	return ret
 }