Added CPU type

errors_test.go

@@ -18,8 +18,8 @@ func TestErrors(t *testing.T) {
 		{"ExpectedFunctionDefinition.q", errors.ExpectedFunctionDefinition},
 		{"ExpectedFunctionName.q", errors.ExpectedFunctionName},
 		{"ExpectedFunctionParameters.q", errors.ExpectedFunctionParameters},
-		{"InvalidInstruction-Identifier.q", &errors.InvalidInstruction{Instruction: "abc"}},
-		{"InvalidInstruction-Number.q", &errors.InvalidInstruction{Instruction: "123"}},
+		{"InvalidInstructionIdentifier.q", &errors.InvalidInstruction{Instruction: "abc"}},
+		{"InvalidInstructionNumber.q", &errors.InvalidInstruction{Instruction: "123"}},
 		{"MissingAssignValue.q", errors.MissingAssignValue},
 		{"MissingBlockEnd.q", errors.MissingBlockEnd},
 		{"MissingBlockStart.q", errors.MissingBlockStart},

src/build/Finalize.go

@@ -29,8 +29,8 @@ func Finalize(functions map[string]*Function) ([]byte, []byte) {
 func entry() *asm.Assembler {
 	entry := asm.New()
 	entry.Call("main")
-	entry.MoveRegisterNumber(x64.SyscallArgs[0], linux.Exit)
-	entry.MoveRegisterNumber(x64.SyscallArgs[1], 0)
+	entry.MoveRegisterNumber(x64.SyscallRegisters[0], linux.Exit)
+	entry.MoveRegisterNumber(x64.SyscallRegisters[1], 0)
 	entry.Syscall()
 	return entry
 }

src/build/Function.go

@@ -4,8 +4,8 @@ import (
 	"fmt"
 	"strconv"
 
-	"git.akyoto.dev/cli/q/src/build/arch/x64"
 	"git.akyoto.dev/cli/q/src/build/asm"
+	"git.akyoto.dev/cli/q/src/build/cpu"
 	"git.akyoto.dev/cli/q/src/build/expression"
 	"git.akyoto.dev/cli/q/src/build/fs"
 	"git.akyoto.dev/cli/q/src/build/token"
@@ -21,6 +21,7 @@ type Function struct {
 	Body      token.List
 	Variables map[string]*Variable
 	Assembler asm.Assembler
+	CPU       cpu.CPU
 	Error     error
 }
 
@@ -169,12 +170,12 @@ func (f *Function) CompileFunctionCall(expr *expression.Expression) error {
 			}
 
 			n, _ := strconv.Atoi(variable.Value.Token.Text())
-			f.Assembler.MoveRegisterNumber(x64.SyscallArgs[i], uint64(n))
+			f.Assembler.MoveRegisterNumber(f.CPU.Syscall[i], uint64(n))
 
 		case token.Number:
 			value := parameter.Token.Text()
 			n, _ := strconv.Atoi(value)
-			f.Assembler.MoveRegisterNumber(x64.SyscallArgs[i], uint64(n))
+			f.Assembler.MoveRegisterNumber(f.CPU.Syscall[i], uint64(n))
 
 		default:
 			panic("Unknown expression")

src/build/arch/x64/Registers.go

@@ -0,0 +1,28 @@
+package x64
+
+import "git.akyoto.dev/cli/q/src/build/cpu"
+
+const (
+	rax = iota
+	rcx
+	rdx
+	rbx
+	rsp
+	rbp
+	rsi
+	rdi
+	r8
+	r9
+	r10
+	r11
+	r12
+	r13
+	r14
+	r15
+)
+
+const SyscallReturn = rax
+
+var GeneralRegisters = []cpu.Register{rbx, rbp, r12, r13, r14, r15}
+var SyscallRegisters = []cpu.Register{rax, rdi, rsi, rdx, r10, r8, r9}
+var ReturnValueRegisters = []cpu.Register{rax, rcx, r11}

src/build/arch/x64/Syscall.go

@@ -1,13 +1,5 @@
 package x64
 
-import "git.akyoto.dev/cli/q/src/build/cpu"
-
-const (
-	SyscallReturn = 0 // rax
-)
-
-var SyscallArgs = []cpu.Register{0, 7, 6, 2, 10, 8, 9}
-
 // Syscall is the primary way to communicate with the OS kernel.
 func Syscall(code []byte) []byte {
 	return append(code, 0x0f, 0x05)

src/build/compile.go

@@ -4,7 +4,7 @@ import (
 	"sync"
 )
 
-// compile waits for all functions to finish compilation.
+// compile waits for the scan to finish and compiles all functions.
 func compile(functions <-chan *Function, errors <-chan error) (map[string]*Function, error) {
 	allFunctions := map[string]*Function{}
 
@@ -28,18 +28,7 @@ func compile(functions <-chan *Function, errors <-chan error) (map[string]*Funct
 		}
 	}
 
-	wg := sync.WaitGroup{}
-
-	for _, function := range allFunctions {
-		wg.Add(1)
-
-		go func() {
-			defer wg.Done()
-			function.Compile()
-		}()
-	}
-
-	wg.Wait()
+	compileFunctions(allFunctions)
 
 	for _, function := range allFunctions {
 		if function.Error != nil {
@@ -49,3 +38,19 @@ func compile(functions <-chan *Function, errors <-chan error) (map[string]*Funct
 
 	return allFunctions, nil
 }
+
+// compileFunctions starts a goroutine for each function compilation and waits for completion.
+func compileFunctions(functions map[string]*Function) {
+	wg := sync.WaitGroup{}
+
+	for _, function := range functions {
+		wg.Add(1)
+
+		go func() {
+			defer wg.Done()
+			function.Compile()
+		}()
+	}
+
+	wg.Wait()
+}

src/build/cpu/CPU.go

@@ -0,0 +1,31 @@
+package cpu
+
+// CPU represents the processor.
+type CPU struct {
+	General []Register
+	Syscall []Register
+	Return  []Register
+	usage   uint64
+}
+
+func (c *CPU) Use(reg Register) {
+	c.usage |= (1 << reg)
+}
+
+func (c *CPU) Free(reg Register) {
+	c.usage &= ^(1 << reg)
+}
+
+func (c *CPU) IsFree(reg Register) bool {
+	return c.usage&(1<<reg) == 0
+}
+
+func (c *CPU) FindFree() (Register, bool) {
+	for _, reg := range c.General {
+		if c.IsFree(reg) {
+			return reg, true
+		}
+	}
+
+	return 0, false
+}

src/build/scan.go

@@ -6,6 +6,8 @@ import (
 	"strings"
 	"sync"
 
+	"git.akyoto.dev/cli/q/src/build/arch/x64"
+	"git.akyoto.dev/cli/q/src/build/cpu"
 	"git.akyoto.dev/cli/q/src/build/fs"
 	"git.akyoto.dev/cli/q/src/build/token"
 	"git.akyoto.dev/cli/q/src/errors"
@@ -225,6 +227,11 @@ func scanFile(path string, functions chan<- *Function) error {
 			Head:      tokens[paramsStart:bodyStart],
 			Body:      tokens[bodyStart : i+1],
 			Variables: map[string]*Variable{},
+			CPU: cpu.CPU{
+				General: x64.GeneralRegisters,
+				Syscall: x64.SyscallRegisters,
+				Return:  x64.ReturnValueRegisters,
+			},
 		}
 
 		nameStart = -1