static gcc_jit_function *generate_code_matchhere(gcc_jit_context *ctx, const char* regexp, const char* function_name)
{
gcc_jit_type *int_type = gcc_jit_context_get_type(ctx, GCC_JIT_TYPE_INT);
gcc_jit_type *char_type = gcc_jit_context_get_type(ctx, GCC_JIT_TYPE_CHAR);
gcc_jit_type *const_char_ptr_type = gcc_jit_context_get_type(ctx, GCC_JIT_TYPE_CONST_CHAR_PTR);
gcc_jit_param *param_text = gcc_jit_context_new_param(ctx, /* loc */ NULL, const_char_ptr_type, "text");
gcc_jit_rvalue *rval_text = gcc_jit_param_as_rvalue(param_text);
// matchhere
gcc_jit_param* params[] = { param_text };
gcc_jit_function *matchhere = gcc_jit_context_new_function(ctx, /* loc */ NULL,
GCC_JIT_FUNCTION_INTERNAL, int_type, function_name,
1, params, /* is_variadic */ 0);
gcc_jit_block* current_block = gcc_jit_function_new_block(matchhere, new_block_name());
gcc_jit_rvalue* text_plus_one =
gcc_jit_context_new_cast(
ctx, /* loc */ NULL,
gcc_jit_lvalue_get_address(
gcc_jit_context_new_array_access(
ctx, /* loc */ NULL,
rval_text,
gcc_jit_context_one(ctx, int_type)),
/* loc */ NULL),
const_char_ptr_type);
gcc_jit_block* return_zero = NULL;
gcc_jit_block* return_one = gcc_jit_function_new_block(matchhere, new_block_name());
gcc_jit_block_end_with_return(
return_one, /* loc */ NULL,
gcc_jit_context_one(ctx, int_type));
// Now go creating
for (;;)
{
if (regexp[0] == '\0')
{
gcc_jit_block_end_with_jump(
current_block, /* loc */ NULL,
return_one);
break; // We are done
}
else if (regexp[1] == '*')
{
// Generate code for the remaining regular expression
gcc_jit_function *remaining_regexp_match = generate_code_matchhere(ctx, regexp + 2, new_function_name());
gcc_jit_block* loop_body = gcc_jit_function_new_block(matchhere, new_block_name());
gcc_jit_block* loop_check = gcc_jit_function_new_block(matchhere, new_block_name());
gcc_jit_block_end_with_jump(current_block, /* loc */ NULL, loop_body);
gcc_jit_rvalue* args[] = { rval_text };
gcc_jit_rvalue* match_remainder =
gcc_jit_context_new_comparison(
ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_NE,
gcc_jit_context_new_call(ctx, /* loc */ NULL,
remaining_regexp_match, 1, args),
gcc_jit_context_zero(ctx, int_type));
gcc_jit_block_end_with_conditional(loop_body, /* loc */ NULL,
match_remainder,
return_one,
loop_check);
gcc_jit_lvalue* tmp = gcc_jit_function_new_local(matchhere, /* loc */ NULL, char_type, new_local_name());
gcc_jit_block_add_assignment(
loop_check, /* loc */ NULL,
tmp,
gcc_jit_lvalue_as_rvalue(
gcc_jit_rvalue_dereference(rval_text, /* loc */ NULL)));
gcc_jit_rvalue* check_expr;
if (regexp[0] == '.')
{
check_expr =
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_NE,
gcc_jit_lvalue_as_rvalue(tmp),
gcc_jit_context_zero(ctx, char_type));
}
else
{
check_expr =
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_EQ,
gcc_jit_lvalue_as_rvalue(tmp),
gcc_jit_context_new_rvalue_from_int(ctx, char_type, regexp[0]));
}
generate_return_zero(ctx, matchhere, &return_zero);
gcc_jit_block_add_assignment(loop_check, /* loc */ NULL,
gcc_jit_param_as_lvalue(param_text),
text_plus_one);
gcc_jit_block_end_with_conditional(loop_check, /* loc */ NULL,
check_expr,
loop_body,
return_zero);
break; // We are done
}
else if (regexp[0] == '$' && regexp[1] == '\0')
{
gcc_jit_block_end_with_return(
current_block, /* loc */ NULL,
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_EQ,
gcc_jit_lvalue_as_rvalue(
gcc_jit_rvalue_dereference(rval_text, /* loc */ NULL)
),
gcc_jit_context_zero(ctx, char_type)));
regexp++;
}
else if (regexp[0] == '.')
{
generate_return_zero(ctx, matchhere, &return_zero);
gcc_jit_block* next_block = gcc_jit_function_new_block(matchhere, new_block_name());
// if (*text == '\0')
// return 0;
gcc_jit_block_end_with_conditional(
current_block, /* loc */ NULL,
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_EQ,
gcc_jit_lvalue_as_rvalue(
gcc_jit_rvalue_dereference(rval_text, /* loc */ NULL)
),
gcc_jit_context_zero(ctx, char_type)),
return_zero,
next_block);
// text = &text[1]; // pointer arithmetic
gcc_jit_block_add_assignment(next_block, /* loc */ NULL,
gcc_jit_param_as_lvalue(param_text),
text_plus_one);
// Chain the code
current_block = next_block;
// Done with the current letter
regexp++;
}
else
{
generate_return_zero(ctx, matchhere, &return_zero);
gcc_jit_block* next_block = gcc_jit_function_new_block(matchhere, new_block_name());
// if (*text != regexp[0])
// return 0;
gcc_jit_block_end_with_conditional(
current_block, /* loc */ NULL,
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_NE,
gcc_jit_lvalue_as_rvalue(
gcc_jit_rvalue_dereference(rval_text, /* loc */ NULL)
),
gcc_jit_context_new_rvalue_from_int(ctx, char_type, regexp[0])),
return_zero,
next_block);
// text = &text[1]; // pointer arithmetic
gcc_jit_block_add_assignment(next_block, /* loc */ NULL,
gcc_jit_param_as_lvalue(param_text),
text_plus_one);
// Chain the code
current_block = next_block;
// Done with the current letter
regexp++;
}
}
// char c[64];
// snprintf(c, 63, "%s.dot", function_name);
// c[63] = '\0';
// gcc_jit_function_dump_to_dot(matchhere, c);
return matchhere;
}
void generate_code_regexp(gcc_jit_context *ctx, const char* regexp)
{
const char* matchhere_regexp = regexp;
if (regexp[0] == '^')
{
matchhere_regexp++;
}
gcc_jit_function* matchhere = generate_code_matchhere(ctx, matchhere_regexp, "matchhere");
// match function
gcc_jit_type *int_type = gcc_jit_context_get_type(ctx, GCC_JIT_TYPE_INT);
gcc_jit_type *char_type = gcc_jit_context_get_type(ctx, GCC_JIT_TYPE_CHAR);
gcc_jit_type *const_char_ptr_type = gcc_jit_context_get_type(ctx, GCC_JIT_TYPE_CONST_CHAR_PTR);
gcc_jit_param *param_text = gcc_jit_context_new_param(ctx, /* loc */ NULL, const_char_ptr_type, "text");
gcc_jit_param *param_regex = gcc_jit_context_new_param(ctx, /* loc */ NULL, const_char_ptr_type, "_regex");
gcc_jit_rvalue *rval_text = gcc_jit_param_as_rvalue(param_text);
gcc_jit_param* params[] = { param_regex, param_text };
gcc_jit_function *match = gcc_jit_context_new_function(ctx, /* loc */ NULL,
GCC_JIT_FUNCTION_EXPORTED, int_type, "match",
2, params, /* is_variadic */ 0);
gcc_jit_rvalue* args[] = { rval_text };
gcc_jit_rvalue* call_to_matchhere = gcc_jit_context_new_call(ctx, /* loc */ NULL,
matchhere,
1, args);
if (regexp[0] == '^')
{
gcc_jit_block* block = gcc_jit_function_new_block(match, new_block_name());
gcc_jit_block_end_with_return(
block, /* loc */ NULL,
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_NE,
call_to_matchhere,
gcc_jit_context_zero(ctx, int_type)));
}
else
{
gcc_jit_block* loop_body = gcc_jit_function_new_block(match, new_block_name());
gcc_jit_block* return_one = gcc_jit_function_new_block(match, new_block_name());
gcc_jit_block* condition_check = gcc_jit_function_new_block(match, new_block_name());
gcc_jit_block* return_zero = gcc_jit_function_new_block(match, new_block_name());
gcc_jit_block_end_with_conditional(
loop_body, /* loc */ NULL,
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_NE,
call_to_matchhere,
gcc_jit_context_zero(ctx, int_type)),
return_one,
condition_check);
gcc_jit_block_end_with_return(
return_one, /* loc */ NULL,
gcc_jit_context_one(ctx, int_type));
gcc_jit_lvalue* tmp = gcc_jit_function_new_local(match, /* loc */ NULL, char_type, new_local_name());
gcc_jit_block_add_assignment(
condition_check, /* loc */ NULL,
tmp,
gcc_jit_lvalue_as_rvalue(
gcc_jit_rvalue_dereference(rval_text, /* loc */ NULL)));
gcc_jit_block_add_assignment(
condition_check, /* loc */ NULL,
gcc_jit_param_as_lvalue(param_text),
gcc_jit_context_new_cast(
ctx, /* loc */ NULL,
gcc_jit_lvalue_get_address(
gcc_jit_context_new_array_access(
ctx, /* loc */ NULL,
rval_text,
gcc_jit_context_one(ctx, int_type)),
/* loc */ NULL),
const_char_ptr_type));
gcc_jit_block_end_with_conditional(
condition_check, /* loc */ NULL,
gcc_jit_context_new_comparison(ctx, /* loc */ NULL,
GCC_JIT_COMPARISON_NE,
gcc_jit_lvalue_as_rvalue(tmp),
gcc_jit_context_zero(ctx, char_type)),
loop_body,
return_zero);
gcc_jit_block_end_with_return(
return_zero, /* loc */ NULL,
gcc_jit_context_zero(ctx, int_type));
}
// gcc_jit_function_dump_to_dot(match, "match.dot");
// gcc_jit_context_dump_to_file(ctx, "generated-regex.dump", /* update-locations */ 1);
// gcc_jit_context_set_bool_option(ctx, GCC_JIT_BOOL_OPTION_DEBUGINFO, 1);
}
void
create_code (gcc_jit_context *ctxt, void *user_data)
{
/* Let's try to inject the equivalent of:
void
test_bogus_access (struct foo f)
{
f.x = f.p;
}
i.e. using the wrong struct for the RHS.
*/
gcc_jit_type *void_type =
gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_VOID);
gcc_jit_type *int_type =
gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT);
/* Map "struct foo". */
gcc_jit_field *x =
gcc_jit_context_new_field (ctxt,
NULL,
int_type,
"x");
gcc_jit_field *y =
gcc_jit_context_new_field (ctxt,
NULL,
int_type,
"y");
gcc_jit_field *foo_fields[] = {x, y};
gcc_jit_struct *struct_foo =
gcc_jit_context_new_struct_type (ctxt, NULL, "foo", 2, foo_fields);
/* Map "struct bar". */
gcc_jit_field *p =
gcc_jit_context_new_field (ctxt,
NULL,
int_type,
"p");
gcc_jit_field *q =
gcc_jit_context_new_field (ctxt,
NULL,
int_type,
"q");
/* We don't actually need a gcc_jit_type for "struct bar" for the test. */
gcc_jit_field *bar_fields[] = {p, q};
(void)gcc_jit_context_new_struct_type (ctxt, NULL, "foo", 2, bar_fields);
/* Build the test function. */
gcc_jit_param *param_f =
gcc_jit_context_new_param (ctxt, NULL,
gcc_jit_struct_as_type (struct_foo), "f");
gcc_jit_function *test_fn =
gcc_jit_context_new_function (ctxt, NULL,
GCC_JIT_FUNCTION_EXPORTED,
void_type,
"test_bogus_access",
1, ¶m_f,
0);
/* OK: f.x = ... */
gcc_jit_lvalue *lvalue =
gcc_jit_lvalue_access_field (
gcc_jit_param_as_lvalue (param_f),
NULL,
x);
/* Erroneous: ... = f.p; */
gcc_jit_rvalue *rvalue =
gcc_jit_rvalue_access_field (
gcc_jit_param_as_rvalue (param_f),
NULL,
p);
gcc_jit_block *block =
gcc_jit_function_new_block (test_fn, NULL);
gcc_jit_block_add_assignment (
block,
NULL,
lvalue, rvalue);
gcc_jit_block_end_with_void_return (block, NULL);
}