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/* Definitions for expressions designed to be executed on the agent
/* Definitions for expressions designed to be executed on the agent
   Copyright (C) 1998, 1999, 2000, 2007, 2008, 2009, 2010
   Copyright (C) 1998, 1999, 2000, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.
   Free Software Foundation, Inc.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
#ifndef AGENTEXPR_H
#ifndef AGENTEXPR_H
#define AGENTEXPR_H
#define AGENTEXPR_H
 
 
#include "doublest.h"           /* For DOUBLEST.  */
#include "doublest.h"           /* For DOUBLEST.  */
 
 
/* It's sometimes useful to be able to debug programs that you can't
/* It's sometimes useful to be able to debug programs that you can't
   really stop for more than a fraction of a second.  To this end, the
   really stop for more than a fraction of a second.  To this end, the
   user can specify a tracepoint (like a breakpoint, but you don't
   user can specify a tracepoint (like a breakpoint, but you don't
   stop at it), and specify a bunch of expressions to record the
   stop at it), and specify a bunch of expressions to record the
   values of when that tracepoint is reached.  As the program runs,
   values of when that tracepoint is reached.  As the program runs,
   GDB collects the values.  At any point (possibly while values are
   GDB collects the values.  At any point (possibly while values are
   still being collected), the user can display the collected values.
   still being collected), the user can display the collected values.
 
 
   This is used with remote debugging; we don't really support it on
   This is used with remote debugging; we don't really support it on
   native configurations.
   native configurations.
 
 
   This means that expressions are being evaluated by the remote agent,
   This means that expressions are being evaluated by the remote agent,
   which doesn't have any access to the symbol table information, and
   which doesn't have any access to the symbol table information, and
   needs to be small and simple.
   needs to be small and simple.
 
 
   The agent_expr routines and datatypes are a bytecode language
   The agent_expr routines and datatypes are a bytecode language
   designed to be executed by the agent.  Agent expressions work in
   designed to be executed by the agent.  Agent expressions work in
   terms of fixed-width values, operators, memory references, and
   terms of fixed-width values, operators, memory references, and
   register references.  You can evaluate a agent expression just given
   register references.  You can evaluate a agent expression just given
   a bunch of memory and register values to sniff at; you don't need
   a bunch of memory and register values to sniff at; you don't need
   any symbolic information like variable names, types, etc.
   any symbolic information like variable names, types, etc.
 
 
   GDB translates source expressions, whose meaning depends on
   GDB translates source expressions, whose meaning depends on
   symbolic information, into agent bytecode expressions, whose meaning
   symbolic information, into agent bytecode expressions, whose meaning
   is independent of symbolic information.  This means the agent can
   is independent of symbolic information.  This means the agent can
   evaluate them on the fly without reference to data only available
   evaluate them on the fly without reference to data only available
   to the host GDB.  */
   to the host GDB.  */


 
 
/* Agent expression data structures.  */
/* Agent expression data structures.  */
 
 
/* The type of an element of the agent expression stack.
/* The type of an element of the agent expression stack.
   The bytecode operation indicates which element we should access;
   The bytecode operation indicates which element we should access;
   the value itself has no typing information.  GDB generates all
   the value itself has no typing information.  GDB generates all
   bytecode streams, so we don't have to worry about type errors.  */
   bytecode streams, so we don't have to worry about type errors.  */
 
 
union agent_val
union agent_val
  {
  {
    LONGEST l;
    LONGEST l;
    DOUBLEST d;
    DOUBLEST d;
  };
  };
 
 
/* A buffer containing a agent expression.  */
/* A buffer containing a agent expression.  */
struct agent_expr
struct agent_expr
  {
  {
    unsigned char *buf;
    unsigned char *buf;
    int len;                    /* number of characters used */
    int len;                    /* number of characters used */
    int size;                   /* allocated size */
    int size;                   /* allocated size */
    CORE_ADDR scope;
    CORE_ADDR scope;
  };
  };
 
 
 
 
 
 
 
 
/* The actual values of the various bytecode operations.
/* The actual values of the various bytecode operations.
 
 
   Other independent implementations of the agent bytecode engine will
   Other independent implementations of the agent bytecode engine will
   rely on the exact values of these enums, and may not be recompiled
   rely on the exact values of these enums, and may not be recompiled
   when we change this table.  The numeric values should remain fixed
   when we change this table.  The numeric values should remain fixed
   whenever possible.  Thus, we assign them values explicitly here (to
   whenever possible.  Thus, we assign them values explicitly here (to
   allow gaps to form safely), and the disassembly table in
   allow gaps to form safely), and the disassembly table in
   agentexpr.h behaves like an opcode map.  If you want to see them
   agentexpr.h behaves like an opcode map.  If you want to see them
   grouped logically, see doc/agentexpr.texi.  */
   grouped logically, see doc/agentexpr.texi.  */
 
 
enum agent_op
enum agent_op
  {
  {
    aop_float = 0x01,
    aop_float = 0x01,
    aop_add = 0x02,
    aop_add = 0x02,
    aop_sub = 0x03,
    aop_sub = 0x03,
    aop_mul = 0x04,
    aop_mul = 0x04,
    aop_div_signed = 0x05,
    aop_div_signed = 0x05,
    aop_div_unsigned = 0x06,
    aop_div_unsigned = 0x06,
    aop_rem_signed = 0x07,
    aop_rem_signed = 0x07,
    aop_rem_unsigned = 0x08,
    aop_rem_unsigned = 0x08,
    aop_lsh = 0x09,
    aop_lsh = 0x09,
    aop_rsh_signed = 0x0a,
    aop_rsh_signed = 0x0a,
    aop_rsh_unsigned = 0x0b,
    aop_rsh_unsigned = 0x0b,
    aop_trace = 0x0c,
    aop_trace = 0x0c,
    aop_trace_quick = 0x0d,
    aop_trace_quick = 0x0d,
    aop_log_not = 0x0e,
    aop_log_not = 0x0e,
    aop_bit_and = 0x0f,
    aop_bit_and = 0x0f,
    aop_bit_or = 0x10,
    aop_bit_or = 0x10,
    aop_bit_xor = 0x11,
    aop_bit_xor = 0x11,
    aop_bit_not = 0x12,
    aop_bit_not = 0x12,
    aop_equal = 0x13,
    aop_equal = 0x13,
    aop_less_signed = 0x14,
    aop_less_signed = 0x14,
    aop_less_unsigned = 0x15,
    aop_less_unsigned = 0x15,
    aop_ext = 0x16,
    aop_ext = 0x16,
    aop_ref8 = 0x17,
    aop_ref8 = 0x17,
    aop_ref16 = 0x18,
    aop_ref16 = 0x18,
    aop_ref32 = 0x19,
    aop_ref32 = 0x19,
    aop_ref64 = 0x1a,
    aop_ref64 = 0x1a,
    aop_ref_float = 0x1b,
    aop_ref_float = 0x1b,
    aop_ref_double = 0x1c,
    aop_ref_double = 0x1c,
    aop_ref_long_double = 0x1d,
    aop_ref_long_double = 0x1d,
    aop_l_to_d = 0x1e,
    aop_l_to_d = 0x1e,
    aop_d_to_l = 0x1f,
    aop_d_to_l = 0x1f,
    aop_if_goto = 0x20,
    aop_if_goto = 0x20,
    aop_goto = 0x21,
    aop_goto = 0x21,
    aop_const8 = 0x22,
    aop_const8 = 0x22,
    aop_const16 = 0x23,
    aop_const16 = 0x23,
    aop_const32 = 0x24,
    aop_const32 = 0x24,
    aop_const64 = 0x25,
    aop_const64 = 0x25,
    aop_reg = 0x26,
    aop_reg = 0x26,
    aop_end = 0x27,
    aop_end = 0x27,
    aop_dup = 0x28,
    aop_dup = 0x28,
    aop_pop = 0x29,
    aop_pop = 0x29,
    aop_zero_ext = 0x2a,
    aop_zero_ext = 0x2a,
    aop_swap = 0x2b,
    aop_swap = 0x2b,
    aop_getv = 0x2c,
    aop_getv = 0x2c,
    aop_setv = 0x2d,
    aop_setv = 0x2d,
    aop_tracev = 0x2e,
    aop_tracev = 0x2e,
    aop_trace16 = 0x30,
    aop_trace16 = 0x30,
    aop_last
    aop_last
  };
  };


 
 
 
 
/* Functions for building expressions.  */
/* Functions for building expressions.  */
 
 
/* Allocate a new, empty agent expression.  */
/* Allocate a new, empty agent expression.  */
extern struct agent_expr *new_agent_expr (CORE_ADDR);
extern struct agent_expr *new_agent_expr (CORE_ADDR);
 
 
/* Free a agent expression.  */
/* Free a agent expression.  */
extern void free_agent_expr (struct agent_expr *);
extern void free_agent_expr (struct agent_expr *);
extern struct cleanup *make_cleanup_free_agent_expr (struct agent_expr *);
extern struct cleanup *make_cleanup_free_agent_expr (struct agent_expr *);
 
 
/* Append a simple operator OP to EXPR.  */
/* Append a simple operator OP to EXPR.  */
extern void ax_simple (struct agent_expr *EXPR, enum agent_op OP);
extern void ax_simple (struct agent_expr *EXPR, enum agent_op OP);
 
 
/* Append the floating-point prefix, for the next bytecode.  */
/* Append the floating-point prefix, for the next bytecode.  */
#define ax_float(EXPR) (ax_simple ((EXPR), aop_float))
#define ax_float(EXPR) (ax_simple ((EXPR), aop_float))
 
 
/* Append a sign-extension instruction to EXPR, to extend an N-bit value.  */
/* Append a sign-extension instruction to EXPR, to extend an N-bit value.  */
extern void ax_ext (struct agent_expr *EXPR, int N);
extern void ax_ext (struct agent_expr *EXPR, int N);
 
 
/* Append a zero-extension instruction to EXPR, to extend an N-bit value.  */
/* Append a zero-extension instruction to EXPR, to extend an N-bit value.  */
extern void ax_zero_ext (struct agent_expr *EXPR, int N);
extern void ax_zero_ext (struct agent_expr *EXPR, int N);
 
 
/* Append a trace_quick instruction to EXPR, to record N bytes.  */
/* Append a trace_quick instruction to EXPR, to record N bytes.  */
extern void ax_trace_quick (struct agent_expr *EXPR, int N);
extern void ax_trace_quick (struct agent_expr *EXPR, int N);
 
 
/* Append a goto op to EXPR.  OP is the actual op (must be aop_goto or
/* Append a goto op to EXPR.  OP is the actual op (must be aop_goto or
   aop_if_goto).  We assume we don't know the target offset yet,
   aop_if_goto).  We assume we don't know the target offset yet,
   because it's probably a forward branch, so we leave space in EXPR
   because it's probably a forward branch, so we leave space in EXPR
   for the target, and return the offset in EXPR of that space, so we
   for the target, and return the offset in EXPR of that space, so we
   can backpatch it once we do know the target offset.  Use ax_label
   can backpatch it once we do know the target offset.  Use ax_label
   to do the backpatching.  */
   to do the backpatching.  */
extern int ax_goto (struct agent_expr *EXPR, enum agent_op OP);
extern int ax_goto (struct agent_expr *EXPR, enum agent_op OP);
 
 
/* Suppose a given call to ax_goto returns some value PATCH.  When you
/* Suppose a given call to ax_goto returns some value PATCH.  When you
   know the offset TARGET that goto should jump to, call
   know the offset TARGET that goto should jump to, call
   ax_label (EXPR, PATCH, TARGET)
   ax_label (EXPR, PATCH, TARGET)
   to patch TARGET into the ax_goto instruction.  */
   to patch TARGET into the ax_goto instruction.  */
extern void ax_label (struct agent_expr *EXPR, int patch, int target);
extern void ax_label (struct agent_expr *EXPR, int patch, int target);
 
 
/* Assemble code to push a constant on the stack.  */
/* Assemble code to push a constant on the stack.  */
extern void ax_const_l (struct agent_expr *EXPR, LONGEST l);
extern void ax_const_l (struct agent_expr *EXPR, LONGEST l);
extern void ax_const_d (struct agent_expr *EXPR, LONGEST d);
extern void ax_const_d (struct agent_expr *EXPR, LONGEST d);
 
 
/* Assemble code to push the value of register number REG on the
/* Assemble code to push the value of register number REG on the
   stack.  */
   stack.  */
extern void ax_reg (struct agent_expr *EXPR, int REG);
extern void ax_reg (struct agent_expr *EXPR, int REG);
 
 
/* Assemble code to operate on a trace state variable.  */
/* Assemble code to operate on a trace state variable.  */
extern void ax_tsv (struct agent_expr *expr, enum agent_op op, int num);
extern void ax_tsv (struct agent_expr *expr, enum agent_op op, int num);


 
 
/* Functions for printing out expressions, and otherwise debugging
/* Functions for printing out expressions, and otherwise debugging
   things.  */
   things.  */
 
 
/* Disassemble the expression EXPR, writing to F.  */
/* Disassemble the expression EXPR, writing to F.  */
extern void ax_print (struct ui_file *f, struct agent_expr * EXPR);
extern void ax_print (struct ui_file *f, struct agent_expr * EXPR);
 
 
/* An entry in the opcode map.  */
/* An entry in the opcode map.  */
struct aop_map
struct aop_map
  {
  {
 
 
    /* The name of the opcode.  Null means that this entry is not a
    /* The name of the opcode.  Null means that this entry is not a
       valid opcode --- a hole in the opcode space.  */
       valid opcode --- a hole in the opcode space.  */
    char *name;
    char *name;
 
 
    /* All opcodes take no operands from the bytecode stream, or take
    /* All opcodes take no operands from the bytecode stream, or take
       unsigned integers of various sizes.  If this is a positive number
       unsigned integers of various sizes.  If this is a positive number
       n, then the opcode is followed by an n-byte operand, which should
       n, then the opcode is followed by an n-byte operand, which should
       be printed as an unsigned integer.  If this is zero, then the
       be printed as an unsigned integer.  If this is zero, then the
       opcode takes no operands from the bytecode stream.
       opcode takes no operands from the bytecode stream.
 
 
       If we get more complicated opcodes in the future, don't add other
       If we get more complicated opcodes in the future, don't add other
       magic values of this; that's a crock.  Add an `enum encoding'
       magic values of this; that's a crock.  Add an `enum encoding'
       field to this, or something like that.  */
       field to this, or something like that.  */
    int op_size;
    int op_size;
 
 
    /* The size of the data operated upon, in bits, for bytecodes that
    /* The size of the data operated upon, in bits, for bytecodes that
       care about that (ref and const).  Zero for all others.  */
       care about that (ref and const).  Zero for all others.  */
    int data_size;
    int data_size;
 
 
    /* Number of stack elements consumed, and number produced.  */
    /* Number of stack elements consumed, and number produced.  */
    int consumed, produced;
    int consumed, produced;
  };
  };
 
 
/* Map of the bytecodes, indexed by bytecode number.  */
/* Map of the bytecodes, indexed by bytecode number.  */
extern struct aop_map aop_map[];
extern struct aop_map aop_map[];
 
 
/* Different kinds of flaws an agent expression might have, as
/* Different kinds of flaws an agent expression might have, as
   detected by agent_reqs.  */
   detected by agent_reqs.  */
enum agent_flaws
enum agent_flaws
  {
  {
    agent_flaw_none = 0, /* code is good */
    agent_flaw_none = 0, /* code is good */
 
 
    /* There is an invalid instruction in the stream.  */
    /* There is an invalid instruction in the stream.  */
    agent_flaw_bad_instruction,
    agent_flaw_bad_instruction,
 
 
    /* There is an incomplete instruction at the end of the expression.  */
    /* There is an incomplete instruction at the end of the expression.  */
    agent_flaw_incomplete_instruction,
    agent_flaw_incomplete_instruction,
 
 
    /* agent_reqs was unable to prove that every jump target is to a
    /* agent_reqs was unable to prove that every jump target is to a
       valid offset.  Valid offsets are within the bounds of the
       valid offset.  Valid offsets are within the bounds of the
       expression, and to a valid instruction boundary.  */
       expression, and to a valid instruction boundary.  */
    agent_flaw_bad_jump,
    agent_flaw_bad_jump,
 
 
    /* agent_reqs was unable to prove to its satisfaction that, for each
    /* agent_reqs was unable to prove to its satisfaction that, for each
       jump target location, the stack will have the same height whether
       jump target location, the stack will have the same height whether
       that location is reached via a jump or by straight execution.  */
       that location is reached via a jump or by straight execution.  */
    agent_flaw_height_mismatch,
    agent_flaw_height_mismatch,
 
 
    /* agent_reqs was unable to prove that every instruction following
    /* agent_reqs was unable to prove that every instruction following
       an unconditional jump was the target of some other jump.  */
       an unconditional jump was the target of some other jump.  */
    agent_flaw_hole
    agent_flaw_hole
  };
  };
 
 
/* Structure describing the requirements of a bytecode expression.  */
/* Structure describing the requirements of a bytecode expression.  */
struct agent_reqs
struct agent_reqs
  {
  {
 
 
    /* If the following is not equal to agent_flaw_none, the rest of the
    /* If the following is not equal to agent_flaw_none, the rest of the
       information in this structure is suspect.  */
       information in this structure is suspect.  */
    enum agent_flaws flaw;
    enum agent_flaws flaw;
 
 
    /* Number of elements left on stack at end; may be negative if expr
    /* Number of elements left on stack at end; may be negative if expr
       only consumes elements.  */
       only consumes elements.  */
    int final_height;
    int final_height;
 
 
    /* Maximum and minimum stack height, relative to initial height.  */
    /* Maximum and minimum stack height, relative to initial height.  */
    int max_height, min_height;
    int max_height, min_height;
 
 
    /* Largest `ref' or `const' opcode used, in bits.  Zero means the
    /* Largest `ref' or `const' opcode used, in bits.  Zero means the
       expression has no such instructions.  */
       expression has no such instructions.  */
    int max_data_size;
    int max_data_size;
 
 
    /* Bit vector of registers used.  Register R is used iff
    /* Bit vector of registers used.  Register R is used iff
 
 
       reg_mask[R / 8] & (1 << (R % 8))
       reg_mask[R / 8] & (1 << (R % 8))
 
 
       is non-zero.  Note!  You may not assume that this bitmask is long
       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
       enough to hold bits for all the registers of the machine; the
       agent expression code has no idea how many registers the machine
       agent expression code has no idea how many registers the machine
       has.  However, the bitmask is reg_mask_len bytes long, so the
       has.  However, the bitmask is reg_mask_len bytes long, so the
       valid register numbers run from 0 to reg_mask_len * 8 - 1.
       valid register numbers run from 0 to reg_mask_len * 8 - 1.
 
 
       We're assuming eight-bit bytes.  So sue me.
       We're assuming eight-bit bytes.  So sue me.
 
 
       The caller should free reg_list when done.  */
       The caller should free reg_list when done.  */
    int reg_mask_len;
    int reg_mask_len;
    unsigned char *reg_mask;
    unsigned char *reg_mask;
  };
  };
 
 
 
 
/* Given an agent expression AX, fill in an agent_reqs structure REQS
/* Given an agent expression AX, fill in an agent_reqs structure REQS
   describing it.  */
   describing it.  */
extern void ax_reqs (struct agent_expr *ax, struct agent_reqs *reqs);
extern void ax_reqs (struct agent_expr *ax, struct agent_reqs *reqs);
 
 
#endif /* AGENTEXPR_H */
#endif /* AGENTEXPR_H */
 
 

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