Implemented echo example

examples/echo/echo.q

@@ -0,0 +1,18 @@
+import mem
+import sys
+
+main() {
+	length := 4096
+	address := mem.alloc(length)
+
+	loop {
+		n := sys.read(0, address, length)
+
+		if n <= 0 {
+			mem.free(address, length)
+			return
+		}
+
+		sys.write(1, address, n)
+	}
+}

lib/mem/alloc.q

@@ -0,0 +1,9 @@
+import sys
+
+alloc(length) {
+	return sys.mmap(0, length, 3, 290)
+}
+
+free(address, length) {
+	return sys.munmap(address, length)
+}

lib/sys/linux.q

@@ -3,7 +3,7 @@ read(fd, address, length) {
 }
 
 write(fd, address, length) {
-	syscall(1, fd, address, length)
+	return syscall(1, fd, address, length)
 }
 
 open(file, flags, mode) {

src/build/core/CompileDefinition.go

@@ -22,21 +22,7 @@ func (f *Function) CompileDefinition(node *ast.Define) error {
 		return errors.New(&errors.UnusedVariable{Name: name}, f.File, node.Name.Position)
 	}
 
-	value := node.Value
-
-	err := value.EachLeaf(func(leaf *expression.Expression) error {
-		if leaf.Token.Kind == token.Identifier && !f.identifierExists(leaf.Token.Text()) {
-			return errors.New(&errors.UnknownIdentifier{Name: leaf.Token.Text()}, f.File, leaf.Token.Position)
-		}
-
-		return nil
-	})
-
-	if err != nil {
-		return err
-	}
-
-	return f.storeVariableInRegister(name, value, uses)
+	return f.storeVariableInRegister(name, node.Value, uses)
 }
 
 func (f *Function) AddVariable(variable *Variable) {
@@ -94,12 +80,7 @@ func (f *Function) identifierExists(name string) bool {
 }
 
 func (f *Function) storeVariableInRegister(name string, value *expression.Expression, uses int) error {
-	reg, exists := f.Scope().FindFree(f.cpu.General)
-
-	if !exists {
-		panic("no free registers")
-	}
-
+	reg := f.Scope().MustFindFree(f.cpu.General)
 	f.Scope().Reserve(reg)
 	err := f.ExpressionToRegister(value, reg)
 

tests/errors/UnknownFunction2.q

@@ -1,7 +1,3 @@
 main() {
 	x := 1 + f(x)
 }
-
-f(x) {
-	return x
-}

tests/errors/UnknownIdentifier3.q

@@ -1,3 +1,7 @@
 main() {
 	x := 1 + f(x)
 }
+
+f(x) {
+	return x
+}

tests/errors_test.go

@@ -34,10 +34,10 @@ var errs = []struct {
 	{"MissingOperand2.q", errors.MissingOperand},
 	{"VariableAlreadyExists.q", &errors.VariableAlreadyExists{Name: "x"}},
 	{"UnknownFunction.q", &errors.UnknownFunction{Name: "unknown"}},
+	{"UnknownFunction2.q", &errors.UnknownFunction{Name: "f"}},
 	{"UnknownIdentifier.q", &errors.UnknownIdentifier{Name: "x"}},
 	{"UnknownIdentifier2.q", &errors.UnknownIdentifier{Name: "x"}},
-	{"UnknownIdentifier3.q", &errors.UnknownIdentifier{Name: "f"}},
-	{"UnknownIdentifier4.q", &errors.UnknownIdentifier{Name: "x"}},
+	{"UnknownIdentifier3.q", &errors.UnknownIdentifier{Name: "x"}},
 	{"UnusedVariable.q", &errors.UnusedVariable{Name: "x"}},
 }
 

tests/examples_test.go

@@ -10,18 +10,19 @@ import (
 
 var examples = []struct {
 	Name     string
-	ExpectedOutput   string
-	ExpectedExitCode int
+	Input    string
+	Output   string
+	ExitCode int
 }{
-	{"hello", "Hello", 0},
-	{"factorial", "", 120},
-	{"fibonacci", "", 55},
+	{"hello", "", "Hello", 0},
+	{"factorial", "", "", 120},
+	{"fibonacci", "", "", 55},
 }
 
 func TestExamples(t *testing.T) {
 	for _, test := range examples {
 		t.Run(test.Name, func(t *testing.T) {
-			run(t, filepath.Join("..", "examples", test.Name), test.ExpectedOutput, test.ExpectedExitCode)
+			run(t, filepath.Join("..", "examples", test.Name), test.Input, test.Output, test.ExitCode)
 		})
 	}
 }

tests/programs_test.go

@@ -4,6 +4,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"git.akyoto.dev/cli/q/src/build"
@@ -12,33 +13,34 @@ import (
 
 var programs = []struct {
 	Name     string
-	ExpectedOutput   string
-	ExpectedExitCode int
+	Input    string
+	Output   string
+	ExitCode int
 }{
-	{"empty", "", 0},
-	{"math", "", 10},
-	{"precedence", "", 10},
-	{"square-sum", "", 25},
-	{"chained-calls", "", 9},
-	{"nested-calls", "", 4},
-	{"param", "", 3},
-	{"param-multi", "", 21},
-	{"reuse", "", 3},
-	{"return", "", 6},
-	{"reassign", "", 2},
-	{"branch", "", 0},
-	{"branch-and", "", 0},
-	{"branch-or", "", 0},
-	{"branch-both", "", 0},
-	{"jump-near", "", 0},
-	{"loop", "", 0},
-	{"loop-lifetime", "", 0},
+	{"empty", "", "", 0},
+	{"math", "", "", 10},
+	{"precedence", "", "", 10},
+	{"square-sum", "", "", 25},
+	{"chained-calls", "", "", 9},
+	{"nested-calls", "", "", 4},
+	{"param", "", "", 3},
+	{"param-multi", "", "", 21},
+	{"reuse", "", "", 3},
+	{"return", "", "", 6},
+	{"reassign", "", "", 2},
+	{"branch", "", "", 0},
+	{"branch-and", "", "", 0},
+	{"branch-or", "", "", 0},
+	{"branch-both", "", "", 0},
+	{"jump-near", "", "", 0},
+	{"loop", "", "", 0},
+	{"loop-lifetime", "", "", 0},
 }
 
 func TestPrograms(t *testing.T) {
 	for _, test := range programs {
 		t.Run(test.Name, func(t *testing.T) {
-			run(t, filepath.Join("programs", test.Name+".q"), test.ExpectedOutput, test.ExpectedExitCode)
+			run(t, filepath.Join("programs", test.Name+".q"), test.Input, test.Output, test.ExitCode)
 		})
 	}
 }
@@ -57,7 +59,7 @@ func BenchmarkPrograms(b *testing.B) {
 }
 
 // run builds and runs the file to check if the output matches the expected output.
-func run(t *testing.T, name string, expectedOutput string, expectedExitCode int) {
+func run(t *testing.T, name string, input string, expectedOutput string, expectedExitCode int) {
 	b := build.New(name)
 	assert.True(t, len(b.Executable()) > 0)
 
@@ -72,6 +74,7 @@ func run(t *testing.T, name string, expectedOutput string, expectedExitCode int)
 	assert.True(t, stat.Size() > 0)
 
 	cmd := exec.Command(b.Executable())
+	cmd.Stdin = strings.NewReader(input)
 	output, err := cmd.Output()
 	exitCode := 0