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#include "test_allocator.h"
#ifdef HAS_EXECINFO
#include <execinfo.h>
#endif
// How many alloc calls we expect
int alloc_calls_expected;
// How many alloc calls we got
int alloc_calls;
// Array of booleans indicating whether to return a block or fail with NULL
call_expectation *expectations;
void set_mock_malloc(int calls, ...) {
va_list args;
va_start(args, calls);
alloc_calls_expected = calls;
alloc_calls = 0;
expectations = calloc(calls, sizeof(expectations));
for (int i = 0; i < calls; i++) {
// Promotable types, baby
expectations[i] = va_arg(args, call_expectation);
}
va_end(args);
}
void finalize_mock_malloc(void) {
assert_int_equal(alloc_calls, alloc_calls_expected);
free(expectations);
}
void print_backtrace(void) {
#if HAS_EXECINFO
void *buffer[128];
int frames = backtrace(buffer, 128);
char **symbols = backtrace_symbols(buffer, frames);
// Skip this function and the caller
for (int i = 2; i < frames; ++i) {
printf("%s\n", symbols[i]);
}
free(symbols);
#endif
}
void *instrumented_malloc(size_t size) {
if (alloc_calls >= alloc_calls_expected) {
goto error;
}
if (expectations[alloc_calls] == MALLOC) {
alloc_calls++;
return malloc(size);
} else if (expectations[alloc_calls] == MALLOC_FAIL) {
alloc_calls++;
return NULL;
}
error:
print_error(
"Unexpected call to malloc(%zu) at position %d of %d; expected %d\n",
size, alloc_calls, alloc_calls_expected,
alloc_calls < alloc_calls_expected ? expectations[alloc_calls] : -1);
print_backtrace();
fail();
return NULL;
}
void *instrumented_realloc(void *ptr, size_t size) {
if (alloc_calls >= alloc_calls_expected) {
goto error;
}
if (expectations[alloc_calls] == REALLOC) {
alloc_calls++;
return realloc(ptr, size);
} else if (expectations[alloc_calls] == REALLOC_FAIL) {
alloc_calls++;
return NULL;
}
error:
print_error(
"Unexpected call to realloc(%zu) at position %d of %d; expected %d\n",
size, alloc_calls, alloc_calls_expected,
alloc_calls < alloc_calls_expected ? expectations[alloc_calls] : -1);
print_backtrace();
fail();
return NULL;
}
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