cprover
remove_calls_no_body.cpp
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1 /*******************************************************************\
2 
3 Module: Remove calls to functions without a body
4 
5 Author: Daniel Poetzl
6 
7 \*******************************************************************/
8 
11 
12 #include "remove_calls_no_body.h"
13 
14 #include <util/invariant.h>
15 
16 #include "goto_functions.h"
17 
24  goto_programt &goto_program,
26  const exprt &lhs,
27  const exprt::operandst &arguments)
28 {
29  PRECONDITION(target->is_function_call());
30  PRECONDITION(!goto_program.empty());
31 
32  goto_programt tmp;
33 
34  // evaluate function arguments -- they might have
35  // pointer dereferencing or the like
36  for(const exprt &argument : arguments)
37  {
39  code_expressiont(argument), target->source_location));
40  }
41 
42  // return value
43  if(lhs.is_not_nil())
44  {
45  side_effect_expr_nondett rhs(lhs.type(), target->source_location);
46 
47  code_assignt code(lhs, rhs);
48  code.add_source_location() = target->source_location;
49 
51  }
52 
53  // kill call
54  target->type = LOCATION;
55  target->code_nonconst().clear();
56  target++;
57 
58  goto_program.destructive_insert(target, tmp);
59 }
60 
66  const goto_programt::const_targett target,
67  const goto_functionst &goto_functions)
68 {
69  if(!target->is_function_call())
70  return false;
71 
72  const exprt &f = target->call_function();
73 
74  if(f.id() != ID_symbol)
75  return false;
76 
77  const symbol_exprt &se = to_symbol_expr(f);
78  const irep_idt id = se.get_identifier();
79 
80  goto_functionst::function_mapt::const_iterator f_it =
81  goto_functions.function_map.find(id);
82 
83  if(f_it != goto_functions.function_map.end())
84  {
85  return !f_it->second.body_available();
86  }
87 
88  return false;
89 }
90 
98 operator()(goto_programt &goto_program, const goto_functionst &goto_functions)
99 {
100  for(goto_programt::targett it = goto_program.instructions.begin();
101  it != goto_program.instructions.end();) // no it++
102  {
103  if(is_opaque_function_call(it, goto_functions))
104  {
106  goto_program, it, it->call_lhs(), it->call_arguments());
107  }
108  else
109  {
110  it++;
111  }
112  }
113 }
114 
120 {
121  for(auto &gf_entry : goto_functions.function_map)
122  {
123  (*this)(gf_entry.second.body, goto_functions);
124  }
125 }
A codet representing an assignment in the program.
Definition: std_code.h:293
codet representation of an expression statement.
Definition: std_code.h:1840
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
Definition: dstring.h:37
Base class for all expressions.
Definition: expr.h:54
std::vector< exprt > operandst
Definition: expr.h:56
source_locationt & add_source_location()
Definition: expr.h:235
const source_locationt & source_location() const
Definition: expr.h:230
typet & type()
Return the type of the expression.
Definition: expr.h:82
A collection of goto functions.
function_mapt function_map
A generic container class for the GOTO intermediate representation of one function.
Definition: goto_program.h:71
instructionst instructions
The list of instructions in the goto program.
Definition: goto_program.h:652
void destructive_insert(const_targett target, goto_programt &p)
Inserts the given program p before target.
Definition: goto_program.h:744
instructionst::iterator targett
Definition: goto_program.h:646
instructionst::const_iterator const_targett
Definition: goto_program.h:647
static instructiont make_assignment(const code_assignt &_code, const source_locationt &l=source_locationt::nil())
Create an assignment instruction.
targett add(instructiont &&instruction)
Adds a given instruction at the end.
Definition: goto_program.h:753
bool empty() const
Is the program empty?
Definition: goto_program.h:826
static instructiont make_other(const codet &_code, const source_locationt &l=source_locationt::nil())
Definition: goto_program.h:971
bool is_not_nil() const
Definition: irep.h:391
const irep_idt & id() const
Definition: irep.h:407
void remove_call_no_body(goto_programt &dest, goto_programt::targett target, const exprt &lhs, const exprt::operandst &arguments)
Remove a single call.
bool is_opaque_function_call(const goto_programt::const_targett target, const goto_functionst &goto_functions)
Check if instruction is a call to an opaque function through an ordinary (non-function pointer) call.
void operator()(goto_programt &goto_program, const goto_functionst &goto_functions)
Remove calls to functions without a body and replace them with evaluations of the arguments of the ca...
A side_effect_exprt that returns a non-deterministically chosen value.
Definition: std_code.h:1966
Expression to hold a symbol (variable)
Definition: std_expr.h:80
const irep_idt & get_identifier() const
Definition: std_expr.h:109
const source_locationt & source_location() const
Definition: type.h:71
Goto Programs with Functions.
Remove calls to functions without a body.
#define PRECONDITION(CONDITION)
Definition: invariant.h:463
const symbol_exprt & to_symbol_expr(const exprt &expr)
Cast an exprt to a symbol_exprt.
Definition: std_expr.h:189