-struct agent_expr {
- unsigned char *buf;
- int len; /* number of characters used */
- int size; /* allocated size */
- CORE_ADDR scope;
-};
-
-
-
-
-/* The actual values of the various bytecode operations.
-
- Other independent implementations of the agent bytecode engine will
- rely on the exact values of these enums, and may not be recompiled
- when we change this table. The numeric values should remain fixed
- whenever possible. Thus, we assign them values explicitly here (to
- allow gaps to form safely), and the disassembly table in
- agentexpr.h behaves like an opcode map. If you want to see them
- grouped logically, see doc/agentexpr.texi. */
-
-enum agent_op {
- aop_float = 0x01,
- aop_add = 0x02,
- aop_sub = 0x03,
- aop_mul = 0x04,
- aop_div_signed = 0x05,
- aop_div_unsigned = 0x06,
- aop_rem_signed = 0x07,
- aop_rem_unsigned = 0x08,
- aop_lsh = 0x09,
- aop_rsh_signed = 0x0a,
- aop_rsh_unsigned = 0x0b,
- aop_trace = 0x0c,
- aop_trace_quick = 0x0d,
- aop_log_not = 0x0e,
- aop_bit_and = 0x0f,
- aop_bit_or = 0x10,
- aop_bit_xor = 0x11,
- aop_bit_not = 0x12,
- aop_equal = 0x13,
- aop_less_signed = 0x14,
- aop_less_unsigned = 0x15,
- aop_ext = 0x16,
- aop_ref8 = 0x17,
- aop_ref16 = 0x18,
- aop_ref32 = 0x19,
- aop_ref64 = 0x1a,
- aop_ref_float = 0x1b,
- aop_ref_double = 0x1c,
- aop_ref_long_double = 0x1d,
- aop_l_to_d = 0x1e,
- aop_d_to_l = 0x1f,
- aop_if_goto = 0x20,
- aop_goto = 0x21,
- aop_const8 = 0x22,
- aop_const16 = 0x23,
- aop_const32 = 0x24,
- aop_const64 = 0x25,
- aop_reg = 0x26,
- aop_end = 0x27,
- aop_dup = 0x28,
- aop_pop = 0x29,
- aop_zero_ext = 0x2a,
- aop_swap = 0x2b,
- aop_trace16 = 0x30,
- aop_last
-};
+struct agent_expr
+ {
+ /* Construct an empty agent expression. */
+ explicit agent_expr (struct gdbarch *gdbarch, CORE_ADDR scope);
+
+ ~agent_expr ();
+
+ /* The bytes of the expression. */
+ unsigned char *buf;
+
+ /* The number of bytecode in the expression. */
+ int len;
+
+ /* Allocated space available currently. */
+ int size;
+
+ /* The target architecture assumed to be in effect. */
+ struct gdbarch *gdbarch;
+
+ /* The address to which the expression applies. */
+ CORE_ADDR scope;
+
+ /* If the following is not equal to agent_flaw_none, the rest of the
+ information in this structure is suspect. */
+ enum agent_flaws flaw;
+
+ /* Number of elements left on stack at end; may be negative if expr
+ only consumes elements. */
+ int final_height;
+
+ /* Maximum and minimum stack height, relative to initial height. */
+ int max_height, min_height;
+
+ /* Largest `ref' or `const' opcode used, in bits. Zero means the
+ expression has no such instructions. */
+ int max_data_size;
+
+ /* Bit vector of registers needed. Register R is needed iff
+
+ reg_mask[R / 8] & (1 << (R % 8))
+
+ is non-zero. Note! You may not assume that this bitmask is long
+ enough to hold bits for all the registers of the machine; the
+ agent expression code has no idea how many registers the machine
+ has. However, the bitmask is reg_mask_len bytes long, so the
+ valid register numbers run from 0 to reg_mask_len * 8 - 1.
+
+ Also note that this mask may contain registers that are needed
+ for the original collection expression to work, but that are
+ not referenced by any bytecode. This could, for example, occur
+ when collecting a local variable allocated to a register; the
+ compiler sets the mask bit and skips generating a bytecode whose
+ result is going to be discarded anyway.
+ */
+ int reg_mask_len;
+ unsigned char *reg_mask;
+
+ /* For the data tracing facility, we need to insert `trace' bytecodes
+ before each data fetch; this records all the memory that the
+ expression touches in the course of evaluation, so that memory will
+ be available when the user later tries to evaluate the expression
+ in GDB.
+
+ Setting the flag 'tracing' to non-zero enables the code that
+ emits the trace bytecodes at the appropriate points. */
+
+ unsigned int tracing : 1;