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How to use Encode method of x86 Package

Best Syzkaller code snippet using x86.Encode

x86_64.go

Source:x86_64.go

...8	"github.com/bspaans/jit-compiler/lib"9)10type X86_64 struct {11}12func (x *X86_64) EncodeExpression(expr IRExpression, ctx *IR_Context, target lib.Operand) ([]lib.Instruction, error) {13	return encodeExpression(expr, ctx, target)14}15func (x *X86_64) EncodeStatement(stmt IR, ctx *IR_Context) ([]lib.Instruction, error) {16	return encodeStatement(stmt, ctx)17}18func (x *X86_64) EncodeDataSection(stmts []IR, ctx *IR_Context) (*Segments, error) {19	segments := NewSegments()20	for _, stmt := range stmts {21		if err := encodeDataSection(stmt, ctx, segments); err != nil {22			return nil, err23		}24	}25	return segments, nil26}27func encodeExpression(e IRExpression, ctx *IR_Context, target lib.Operand) ([]lib.Instruction, error) {28	switch v := e.(type) {29	case *expr.IR_Add:30		return encode_IR_Add(v, ctx, target)31	case *expr.IR_And:32		return encode_IR_And(v, ctx, target)...

not.go

Source:not.go

1package x86_642import (3	"fmt"4	. "github.com/bspaans/jit-compiler/ir/shared"5	"github.com/bspaans/jit-compiler/asm/x86_64"6	"github.com/bspaans/jit-compiler/asm/x86_64/encoding"7	"github.com/bspaans/jit-compiler/ir/expr"8	"github.com/bspaans/jit-compiler/lib"9)10func encode_IR_Not(i *expr.IR_Not, ctx *IR_Context, target lib.Operand, includeSETE bool) ([]lib.Instruction, error) {11	var reg1 lib.Operand12	result := []lib.Instruction{}13	switch c := i.Op1.(type) {14	case *expr.IR_Variable:15		variable := c.Value16		reg1 = ctx.VariableMap[variable]17		if !includeSETE {18			cmp := x86_64.CMP_immediate(1, reg1)19			result = append(result, cmp)20			ctx.AddInstruction(cmp)21		}22	case *expr.IR_Bool:23		value := uint64(0)24		if c.Value {25			value = 126		}27		reg1 = ctx.AllocateRegister(TUint64)28		defer ctx.DeallocateRegister(reg1.(*encoding.Register))29		mov := x86_64.MOV_immediate(value, reg1)30		cmp := x86_64.CMP_immediate(1, reg1)31		result = append(result, mov, cmp)32		ctx.AddInstruction(mov, cmp)33	case *expr.IR_Equals:34		var err error35		var eq []lib.Instruction36		eq, err = encode_IR_Equals(c, ctx, target, includeSETE)37		if err != nil {38			return nil, err39		}40		for _, r := range eq {41			result = append(result, r)42		}43		reg1 = target44		// TODO: introduce logical operator interface45	case *expr.IR_LT:46		var err error47		var eq []lib.Instruction48		eq, err = encode_IR_LT(c, ctx, target, includeSETE)49		if err != nil {50			return nil, err51		}52		for _, r := range eq {53			result = append(result, r)54		}55		reg1 = target56		// TODO: introduce logical operator interface57	case *expr.IR_LTE:58		var err error59		var eq []lib.Instruction60		eq, err = encode_IR_LTE(c, ctx, target, includeSETE)61		if err != nil {62			return nil, err63		}64		for _, r := range eq {65			result = append(result, r)66		}67		reg1 = target68	case *expr.IR_GT:69		var err error70		var eq []lib.Instruction71		eq, err = encode_IR_GT(c, ctx, target, includeSETE)72		if err != nil {73			return nil, err74		}75		for _, r := range eq {76			result = append(result, r)77		}78		reg1 = target79		// TODO: introduce logical operator interface80	case *expr.IR_GTE:81		var err error82		var eq []lib.Instruction83		eq, err = encode_IR_GTE(c, ctx, target, includeSETE)84		if err != nil {85			return nil, err86		}87		for _, r := range eq {88			result = append(result, r)89		}90		reg1 = target91	case *expr.IR_And:92		var err error93		var eq []lib.Instruction94		eq, err = encode_IR_And(c, ctx, target)95		if err != nil {96			return nil, err97		}98		for _, r := range eq {99			result = append(result, r)100		}101		reg1 = target102	case *expr.IR_Or:103		var err error104		var eq []lib.Instruction105		eq, err = encode_IR_Or(c, ctx, target)106		if err != nil {107			return nil, err108		}109		for _, r := range eq {110			result = append(result, r)111		}112		reg1 = target113	default:114		return nil, fmt.Errorf("Unsupported ! operation: %s", i.Op1.Type())115	}116	if includeSETE {117		tmpReg := ctx.AllocateRegister(TUint64)118		defer ctx.DeallocateRegister(tmpReg)119		instr := []lib.Instruction{}120		// TODO: use test?121		instr = append(instr, x86_64.XOR(tmpReg, tmpReg))122		instr = append(instr, x86_64.CMP_immediate(0, reg1))123		instr = append(instr, x86_64.SETE(tmpReg.(*encoding.Register).Get8BitRegister()))124		instr = append(instr, x86_64.MOV(tmpReg.(*encoding.Register).ForOperandWidth(target.Width()), target))125		for _, inst := range instr {126			result = append(result, inst)127			ctx.AddInstruction(inst)128		}129	}130	return result, nil131}...

conditional_jump.go

Source:conditional_jump.go

1package x86_642import (3	"fmt"4	"github.com/bspaans/jit-compiler/asm/x86_64"5	"github.com/bspaans/jit-compiler/asm/x86_64/encoding"6	"github.com/bspaans/jit-compiler/ir/expr"7	. "github.com/bspaans/jit-compiler/ir/shared"8	"github.com/bspaans/jit-compiler/lib"9)10func conditionalJump(ctx *IR_Context, condition IRExpression, stmtLen int) ([]lib.Instruction, error) {11	jmpSize := 212	reg := ctx.AllocateRegister(TBool)13	defer ctx.DeallocateRegister(reg)14	var result []lib.Instruction15	var instr []lib.Instruction16	var err error17	switch condition.(type) {18	case *expr.IR_Equals:19		c := condition.(*expr.IR_Equals)20		result, err = encode_IR_Equals(c, ctx, reg, false)21		instr = []lib.Instruction{22			x86_64.JNE(encoding.Uint8(stmtLen + jmpSize)),23		}24	case *expr.IR_LT:25		c := condition.(*expr.IR_LT)26		result, err = encode_IR_LT(c, ctx, reg, false)27		if IsSignedInteger(c.Op1.ReturnType(ctx)) {28			instr = []lib.Instruction{29				x86_64.JNL(encoding.Uint8(stmtLen + jmpSize)),30			}31		} else {32			instr = []lib.Instruction{33				x86_64.JNB(encoding.Uint8(stmtLen + jmpSize)),34			}35		}36	case *expr.IR_LTE:37		c := condition.(*expr.IR_LTE)38		result, err = encode_IR_LTE(c, ctx, reg, false)39		if IsSignedInteger(c.Op1.ReturnType(ctx)) {40			instr = []lib.Instruction{41				x86_64.JNLE(encoding.Uint8(stmtLen + jmpSize)),42			}43		} else {44			instr = []lib.Instruction{45				x86_64.JNBE(encoding.Uint8(stmtLen + jmpSize)),46			}47		}48	case *expr.IR_GT:49		c := condition.(*expr.IR_GT)50		result, err = encode_IR_GT(c, ctx, reg, false)51		if IsSignedInteger(c.Op1.ReturnType(ctx)) {52			instr = []lib.Instruction{53				x86_64.JNG(encoding.Uint8(stmtLen + jmpSize)),54			}55		} else {56			instr = []lib.Instruction{57				x86_64.JNA(encoding.Uint8(stmtLen + jmpSize)),58			}59		}60	case *expr.IR_GTE:61		c := condition.(*expr.IR_GTE)62		result, err = encode_IR_GTE(c, ctx, reg, false)63		if IsSignedInteger(c.Op1.ReturnType(ctx)) {64			instr = []lib.Instruction{65				x86_64.JNGE(encoding.Uint8(stmtLen + jmpSize)),66			}67		} else {68			instr = []lib.Instruction{69				x86_64.JNAE(encoding.Uint8(stmtLen + jmpSize)),70			}71		}72	case *expr.IR_Not:73		result, err = encode_IR_Not(condition.(*expr.IR_Not), ctx, reg, false)74		instr = []lib.Instruction{75			x86_64.JE(encoding.Uint8(stmtLen + jmpSize)),76		}77	case *expr.IR_And:78		result, err = encode_IR_And(condition.(*expr.IR_And), ctx, reg)79		instr = []lib.Instruction{80			x86_64.JE(encoding.Uint8(stmtLen + jmpSize)),81		}82	case *expr.IR_Or:83		result, err = encode_IR_Or(condition.(*expr.IR_Or), ctx, reg)84		instr = []lib.Instruction{85			x86_64.JE(encoding.Uint8(stmtLen + jmpSize)),86		}87	case *expr.IR_Bool, *expr.IR_Variable:88		result, err = encodeExpression(condition, ctx, reg)89		instr = []lib.Instruction{90			x86_64.CMP_immediate(1, reg),91			x86_64.JNE(encoding.Uint8(stmtLen + jmpSize)),92		}93	default:94		return nil, fmt.Errorf("Unsupported condition %s (type: %v)", condition.String(), condition.Type())95	}96	if err != nil {97		return nil, err98	}99	for _, inst := range instr {100		ctx.AddInstruction(inst)101		result = append(result, inst)102	}103	return result, nil104}...

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