the main ZAM code

src/script_opt/ZAM/ZOp.h

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+// See the file "COPYING" in the main distribution directory for copyright.
+
+// ZAM instruction opcodes and associated information.
+
+#pragma once
+
+namespace zeek::detail {
+
+// Opcodes associated with ZAM instructions.
+typedef enum {
+#include "zeek/ZAM-OpsDefs.h"
+	OP_NOP,
+} ZOp;
+
+
+// Possible types of instruction operands in terms of which fields they use.
+// Used for low-level optimization (so important that they're correct),
+// and for dumping instructions.
+
+// V: one of the instruction's integer values, treated as a frame slot
+// C: the instruction's associated constant
+// I1/I2/I3/I4: the instruction's integer value, used directly (not as a slot)
+// FRAME: a slot in the (intrepreter) Frame object
+// X: no operands
+typedef enum {
+	OP_X, OP_C, OP_V, OP_V_I1, OP_VC_I1,
+
+	OP_VC,
+	OP_VV,
+	OP_VV_I2,
+	OP_VV_I1_I2,
+	OP_VV_FRAME,
+
+	OP_VVC,
+	OP_VVC_I2,
+	OP_VVV,
+	OP_VVV_I3,
+	OP_VVV_I2_I3,
+
+	OP_VVVC,
+	OP_VVVC_I3,
+	OP_VVVC_I2_I3,
+	OP_VVVC_I1_I2_I3,
+	OP_VVVV,
+	OP_VVVV_I4,
+	OP_VVVV_I3_I4,
+	OP_VVVV_I2_I3_I4,
+
+} ZAMOpType;
+
+// Possible "flavors" for an operator's first slot.
+typedef enum {
+	OP1_READ,	// the slot is read, not modified
+	OP1_WRITE,	// the slot is modified, not read - the most common
+	OP1_READ_WRITE,	// the slot is both read and then modified, e.g. "++"
+	OP1_INTERNAL,	// we're doing some internal manipulation of the slot
+} ZAMOp1Flavor;
+
+// Maps an operand to its flavor.
+extern ZAMOp1Flavor op1_flavor[];
+
+// Maps an operand to whether it has side effects.
+extern bool op_side_effects[];
+
+} // namespace zeek::detail