1 files changed, 247 insertions, 0 deletions
diff --git a/vendor/github.com/mmcloughlin/avo/operand/checks.go b/vendor/github.com/mmcloughlin/avo/operand/checks.go
new file mode 100644
index 0000000..2585479
--- /dev/null
+++ b/vendor/github.com/mmcloughlin/avo/operand/checks.go
@@ -0,0 +1,247 @@
+package operand
+
+import "github.com/mmcloughlin/avo/reg"
+
+// Pure type assertion checks:
+
+// IsRegister returns whether op has type reg.Register.
+func IsRegister(op Op) bool { _, ok := op.(reg.Register); return ok }
+
+// IsMem returns whether op has type Mem.
+func IsMem(op Op) bool { _, ok := op.(Mem); return ok }
+
+// IsRel returns whether op has type Rel.
+func IsRel(op Op) bool { _, ok := op.(Rel); return ok }
+
+// Checks corresponding to specific operand types in the Intel Manual:
+
+// Is1 returns true if op is the immediate constant 1.
+func Is1(op Op) bool {
+	i, ok := op.(U8)
+	return ok && i == 1
+}
+
+// Is3 returns true if op is the immediate constant 3.
+func Is3(op Op) bool {
+	i, ok := op.(U8)
+	return ok && i == 3
+}
+
+// IsIMM2U returns true if op is a 2-bit unsigned immediate (less than 4).
+func IsIMM2U(op Op) bool {
+	i, ok := op.(U8)
+	return ok && i < 4
+}
+
+// IsIMM8 returns true is op is an 8-bit immediate.
+func IsIMM8(op Op) bool {
+	_, ok := op.(U8)
+	return ok
+}
+
+// IsIMM16 returns true is op is a 16-bit immediate.
+func IsIMM16(op Op) bool {
+	_, ok := op.(U16)
+	return ok
+}
+
+// IsIMM32 returns true is op is a 32-bit immediate.
+func IsIMM32(op Op) bool {
+	_, ok := op.(U32)
+	return ok
+}
+
+// IsIMM64 returns true is op is a 64-bit immediate.
+func IsIMM64(op Op) bool {
+	_, ok := op.(U64)
+	return ok
+}
+
+// IsAL returns true if op is the AL register.
+func IsAL(op Op) bool {
+	return op == reg.AL
+}
+
+// IsCL returns true if op is the CL register.
+func IsCL(op Op) bool {
+	return op == reg.CL
+}
+
+// IsAX returns true if op is the 16-bit AX register.
+func IsAX(op Op) bool {
+	return op == reg.AX
+}
+
+// IsEAX returns true if op is the 32-bit EAX register.
+func IsEAX(op Op) bool {
+	return op == reg.EAX
+}
+
+// IsRAX returns true if op is the 64-bit RAX register.
+func IsRAX(op Op) bool {
+	return op == reg.RAX
+}
+
+// IsR8 returns true if op is an 8-bit general-purpose register.
+func IsR8(op Op) bool {
+	return IsGP(op, 1)
+}
+
+// IsR16 returns true if op is a 16-bit general-purpose register.
+func IsR16(op Op) bool {
+	return IsGP(op, 2)
+}
+
+// IsR32 returns true if op is a 32-bit general-purpose register.
+func IsR32(op Op) bool {
+	return IsGP(op, 4)
+}
+
+// IsR64 returns true if op is a 64-bit general-purpose register.
+func IsR64(op Op) bool {
+	return IsGP(op, 8)
+}
+
+// IsPseudo returns true if op is a pseudo register.
+func IsPseudo(op Op) bool {
+	return IsRegisterKind(op, reg.KindPseudo)
+}
+
+// IsGP returns true if op is a general-purpose register of size n bytes.
+func IsGP(op Op, n uint) bool {
+	return IsRegisterKindSize(op, reg.KindGP, n)
+}
+
+// IsXMM0 returns true if op is the X0 register.
+func IsXMM0(op Op) bool {
+	return op == reg.X0
+}
+
+// IsXMM returns true if op is a 128-bit XMM register.
+func IsXMM(op Op) bool {
+	return IsRegisterKindSize(op, reg.KindVector, 16)
+}
+
+// IsYMM returns true if op is a 256-bit YMM register.
+func IsYMM(op Op) bool {
+	return IsRegisterKindSize(op, reg.KindVector, 32)
+}
+
+// IsRegisterKindSize returns true if op is a register of the given kind and size in bytes.
+func IsRegisterKindSize(op Op, k reg.Kind, n uint) bool {
+	r, ok := op.(reg.Register)
+	return ok && r.Kind() == k && r.Size() == n
+}
+
+// IsRegisterKind returns true if op is a register of the given kind.
+func IsRegisterKind(op Op, k reg.Kind) bool {
+	r, ok := op.(reg.Register)
+	return ok && r.Kind() == k
+}
+
+// IsM returns true if op is a 16-, 32- or 64-bit memory operand.
+func IsM(op Op) bool {
+	// TODO(mbm): confirm "m" check is defined correctly
+	// Intel manual: "A 16-, 32- or 64-bit operand in memory."
+	return IsM16(op) || IsM32(op) || IsM64(op)
+}
+
+// IsM8 returns true if op is an 8-bit memory operand.
+func IsM8(op Op) bool {
+	// TODO(mbm): confirm "m8" check is defined correctly
+	// Intel manual: "A byte operand in memory, usually expressed as a variable or
+	// array name, but pointed to by the DS:(E)SI or ES:(E)DI registers. In 64-bit
+	// mode, it is pointed to by the RSI or RDI registers."
+	return IsMSize(op, 1)
+}
+
+// IsM16 returns true if op is a 16-bit memory operand.
+func IsM16(op Op) bool {
+	return IsMSize(op, 2)
+}
+
+// IsM32 returns true if op is a 16-bit memory operand.
+func IsM32(op Op) bool {
+	return IsMSize(op, 4)
+}
+
+// IsM64 returns true if op is a 64-bit memory operand.
+func IsM64(op Op) bool {
+	return IsMSize(op, 8)
+}
+
+// IsMSize returns true if op is a memory operand using general-purpose address
+// registers of the given size in bytes.
+func IsMSize(op Op, n uint) bool {
+	// TODO(mbm): should memory operands have a size attribute as well?
+	// TODO(mbm): m8,m16,m32,m64 checks do not actually check size
+	m, ok := op.(Mem)
+	return ok && IsMReg(m.Base) && (m.Index == nil || IsMReg(m.Index))
+}
+
+// IsMReg returns true if op is a register that can be used in a memory operand.
+func IsMReg(op Op) bool {
+	return IsPseudo(op) || IsRegisterKind(op, reg.KindGP)
+}
+
+// IsM128 returns true if op is a 128-bit memory operand.
+func IsM128(op Op) bool {
+	// TODO(mbm): should "m128" be the same as "m64"?
+	return IsM64(op)
+}
+
+// IsM256 returns true if op is a 256-bit memory operand.
+func IsM256(op Op) bool {
+	// TODO(mbm): should "m256" be the same as "m64"?
+	return IsM64(op)
+}
+
+// IsVM32X returns true if op is a vector memory operand with 32-bit XMM index.
+func IsVM32X(op Op) bool {
+	return IsVmx(op)
+}
+
+// IsVM64X returns true if op is a vector memory operand with 64-bit XMM index.
+func IsVM64X(op Op) bool {
+	return IsVmx(op)
+}
+
+// IsVmx returns true if op is a vector memory operand with XMM index.
+func IsVmx(op Op) bool {
+	return isvm(op, IsXMM)
+}
+
+// IsVM32Y returns true if op is a vector memory operand with 32-bit YMM index.
+func IsVM32Y(op Op) bool {
+	return IsVmy(op)
+}
+
+// IsVM64Y returns true if op is a vector memory operand with 64-bit YMM index.
+func IsVM64Y(op Op) bool {
+	return IsVmy(op)
+}
+
+// IsVmy returns true if op is a vector memory operand with YMM index.
+func IsVmy(op Op) bool {
+	return isvm(op, IsYMM)
+}
+
+func isvm(op Op, idx func(Op) bool) bool {
+	m, ok := op.(Mem)
+	return ok && IsR64(m.Base) && idx(m.Index)
+}
+
+// IsREL8 returns true if op is an 8-bit offset relative to instruction pointer.
+func IsREL8(op Op) bool {
+	r, ok := op.(Rel)
+	return ok && r == Rel(int8(r))
+}
+
+// IsREL32 returns true if op is an offset relative to instruction pointer, or a
+// label reference.
+func IsREL32(op Op) bool {
+	// TODO(mbm): should labels be considered separately?
+	_, rel := op.(Rel)
+	_, label := op.(LabelRef)
+	return rel || label
+}