cl: to support stdin/stdout/stderr

cl/_testrt/fprintf/in.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	"github.com/goplus/llgo/internal/runtime/c"
+)
+
+func main() {
+	c.Fprintf(c.Stderr, c.Str("Hello %d\n"), 100)
+}

cl/_testrt/fprintf/out.ll

@@ -0,0 +1,32 @@
+; ModuleID = 'main'
+source_filename = "main"
+
+@"main.init$guard" = global ptr null
+@"github.com/goplus/llgo/internal/runtime/c.Stderr" = external global ptr
+@0 = private unnamed_addr constant [10 x i8] c"Hello %d\0A\00", align 1
+
+define void @main.init() {
+_llgo_0:
+  %0 = load i1, ptr @"main.init$guard", align 1
+  br i1 %0, label %_llgo_2, label %_llgo_1
+
+_llgo_1:                                          ; preds = %_llgo_0
+  store i1 true, ptr @"main.init$guard", align 1
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+define void @main() {
+_llgo_0:
+  call void @"github.com/goplus/llgo/internal/runtime.init"()
+  call void @main.init()
+  %0 = load ptr, ptr @"github.com/goplus/llgo/internal/runtime/c.Stderr", align 8
+  %1 = call i32 (ptr, ptr, ...) @fprintf(ptr %0, ptr @0, i64 100)
+  ret void
+}
+
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare i32 @fprintf(ptr, ptr, ...)

cl/compile_test.go

@@ -29,7 +29,7 @@ func testCompile(t *testing.T, src, expected string) {
 }
 
 func TestFromTestrt(t *testing.T) {
-	cltest.FromDir(t, "", "./_testrt", true)
+	cltest.FromDir(t, "fprintf", "./_testrt", true)
 }
 
 func TestFromTestdata(t *testing.T) {

internal/runtime/c/c.go

@@ -27,8 +27,18 @@ type (
 	Char    = int8
 	Int     = C.int
 	Pointer = unsafe.Pointer
+	FilePtr = unsafe.Pointer
 )
 
+//go:linkname Stdin __stdinp
+var Stdin FilePtr
+
+//go:linkname Stdout __stdoutp
+var Stdout FilePtr
+
+//go:linkname Stderr __stderrp
+var Stderr FilePtr
+
 //go:linkname Str llgo.cstr
 func Str(string) *Char
 
@@ -52,3 +62,6 @@ func Memcpy(dst, src Pointer, n uintptr) Pointer
 
 //go:linkname Printf C.printf
 func Printf(format *Char, __llgo_va_list ...any) Int
+
+//go:linkname Fprintf C.fprintf
+func Fprintf(fp FilePtr, format *Char, __llgo_va_list ...any) Int