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+// Copyright (c) 2010 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// postfix_evaluator_unittest.cc: Unit tests for PostfixEvaluator.
+//
+// Author: Mark Mentovai
+
+#include <assert.h>
+#include <stdio.h>
+
+#include <map>
+#include <string>
+
+#include "processor/postfix_evaluator-inl.h"
+
+#include "common/using_std_string.h"
+#include "google_breakpad/common/breakpad_types.h"
+#include "google_breakpad/processor/memory_region.h"
+#include "processor/logging.h"
+
+
+namespace {
+
+
+using std::map;
+using google_breakpad::MemoryRegion;
+using google_breakpad::PostfixEvaluator;
+
+
+// FakeMemoryRegion is used to test PostfixEvaluator's dereference (^)
+// operator. The result of dereferencing a value is one greater than
+// the value.
+class FakeMemoryRegion : public MemoryRegion {
+ public:
+ virtual uint64_t GetBase() const { return 0; }
+ virtual uint32_t GetSize() const { return 0; }
+ virtual bool GetMemoryAtAddress(uint64_t address, uint8_t *value) const {
+ *value = address + 1;
+ return true;
+ }
+ virtual bool GetMemoryAtAddress(uint64_t address, uint16_t *value) const {
+ *value = address + 1;
+ return true;
+ }
+ virtual bool GetMemoryAtAddress(uint64_t address, uint32_t *value) const {
+ *value = address + 1;
+ return true;
+ }
+ virtual bool GetMemoryAtAddress(uint64_t address, uint64_t *value) const {
+ *value = address + 1;
+ return true;
+ }
+ virtual void Print() const {
+ assert(false);
+ }
+};
+
+
+struct EvaluateTest {
+ // Expression passed to PostfixEvaluator::Evaluate.
+ const string expression;
+
+ // True if the expression is expected to be evaluable, false if evaluation
+ // is expected to fail.
+ bool evaluable;
+};
+
+
+struct EvaluateTestSet {
+ // The dictionary used for all tests in the set.
+ PostfixEvaluator<unsigned int>::DictionaryType *dictionary;
+
+ // The list of tests.
+ const EvaluateTest *evaluate_tests;
+
+ // The number of tests.
+ unsigned int evaluate_test_count;
+
+ // Identifiers and their expected values upon completion of the Evaluate
+ // tests in the set.
+ map<string, unsigned int> *validate_data;
+};
+
+
+struct EvaluateForValueTest {
+ // Expression passed to PostfixEvaluator::Evaluate.
+ const string expression;
+
+ // True if the expression is expected to be evaluable, false if evaluation
+ // is expected to fail.
+ bool evaluable;
+
+ // If evaluable, the value we expect it to yield.
+ unsigned int value;
+};
+
+static bool RunTests() {
+ // The first test set checks the basic operations and failure modes.
+ PostfixEvaluator<unsigned int>::DictionaryType dictionary_0;
+ const EvaluateTest evaluate_tests_0[] = {
+ { "$rAdd 2 2 + =", true }, // $rAdd = 2 + 2 = 4
+ { "$rAdd $rAdd 2 + =", true }, // $rAdd = $rAdd + 2 = 6
+ { "$rAdd 2 $rAdd + =", true }, // $rAdd = 2 + $rAdd = 8
+ { "99", false }, // put some junk on the stack...
+ { "$rAdd2 2 2 + =", true }, // ...and make sure things still work
+ { "$rAdd2\t2\n2 + =", true }, // same but with different whitespace
+ { "$rAdd2 2 2 + = ", true }, // trailing whitespace
+ { " $rAdd2 2 2 + =", true }, // leading whitespace
+ { "$rAdd2 2 2 + =", true }, // extra whitespace
+ { "$T0 2 = +", false }, // too few operands for add
+ { "2 + =", false }, // too few operands for add
+ { "2 +", false }, // too few operands for add
+ { "+", false }, // too few operands for add
+ { "^", false }, // too few operands for dereference
+ { "=", false }, // too few operands for assignment
+ { "2 =", false }, // too few operands for assignment
+ { "2 2 + =", false }, // too few operands for assignment
+ { "2 2 =", false }, // can't assign into a literal
+ { "k 2 =", false }, // can't assign into a constant
+ { "2", false }, // leftover data on stack
+ { "2 2 +", false }, // leftover data on stack
+ { "$rAdd", false }, // leftover data on stack
+ { "0 $T1 0 0 + =", false }, // leftover data on stack
+ { "$T2 $T2 2 + =", false }, // can't operate on an undefined value
+ { "$rMul 9 6 * =", true }, // $rMul = 9 * 6 = 54
+ { "$rSub 9 6 - =", true }, // $rSub = 9 - 6 = 3
+ { "$rDivQ 9 6 / =", true }, // $rDivQ = 9 / 6 = 1
+ { "$rDivM 9 6 % =", true }, // $rDivM = 9 % 6 = 3
+ { "$rDeref 9 ^ =", true }, // $rDeref = ^9 = 10 (FakeMemoryRegion)
+ { "$rAlign 36 8 @ =", true }, // $rAlign = 36 @ 8
+ { "$rAdd3 2 2 + =$rMul2 9 6 * =", true } // smashed-equals tokenization
+ };
+ map<string, unsigned int> validate_data_0;
+ validate_data_0["$rAdd"] = 8;
+ validate_data_0["$rAdd2"] = 4;
+ validate_data_0["$rSub"] = 3;
+ validate_data_0["$rMul"] = 54;
+ validate_data_0["$rDivQ"] = 1;
+ validate_data_0["$rDivM"] = 3;
+ validate_data_0["$rDeref"] = 10;
+ validate_data_0["$rAlign"] = 32;
+ validate_data_0["$rAdd3"] = 4;
+ validate_data_0["$rMul2"] = 54;
+
+ // The second test set simulates a couple of MSVC program strings.
+ // The data is fudged a little bit because the tests use FakeMemoryRegion
+ // instead of a real stack snapshot, but the program strings are real and
+ // the implementation doesn't know or care that the data is not real.
+ PostfixEvaluator<unsigned int>::DictionaryType dictionary_1;
+ dictionary_1["$ebp"] = 0xbfff0010;
+ dictionary_1["$eip"] = 0x10000000;
+ dictionary_1["$esp"] = 0xbfff0000;
+ dictionary_1[".cbSavedRegs"] = 4;
+ dictionary_1[".cbParams"] = 4;
+ dictionary_1[".raSearchStart"] = 0xbfff0020;
+ const EvaluateTest evaluate_tests_1[] = {
+ { "$T0 $ebp = $eip $T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = "
+ "$L $T0 .cbSavedRegs - = $P $T0 8 + .cbParams + =", true },
+ // Intermediate state: $T0 = 0xbfff0010, $eip = 0xbfff0015,
+ // $ebp = 0xbfff0011, $esp = 0xbfff0018,
+ // $L = 0xbfff000c, $P = 0xbfff001c
+ { "$T0 $ebp = $eip $T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + = "
+ "$L $T0 .cbSavedRegs - = $P $T0 8 + .cbParams + = $ebx $T0 28 - ^ =",
+ true },
+ // Intermediate state: $T0 = 0xbfff0011, $eip = 0xbfff0016,
+ // $ebp = 0xbfff0012, $esp = 0xbfff0019,
+ // $L = 0xbfff000d, $P = 0xbfff001d,
+ // $ebx = 0xbffefff6
+ { "$T0 $ebp = $T2 $esp = $T1 .raSearchStart = $eip $T1 ^ = $ebp $T0 = "
+ "$esp $T1 4 + = $L $T0 .cbSavedRegs - = $P $T1 4 + .cbParams + = "
+ "$ebx $T0 28 - ^ =",
+ true }
+ };
+ map<string, unsigned int> validate_data_1;
+ validate_data_1["$T0"] = 0xbfff0012;
+ validate_data_1["$T1"] = 0xbfff0020;
+ validate_data_1["$T2"] = 0xbfff0019;
+ validate_data_1["$eip"] = 0xbfff0021;
+ validate_data_1["$ebp"] = 0xbfff0012;
+ validate_data_1["$esp"] = 0xbfff0024;
+ validate_data_1["$L"] = 0xbfff000e;
+ validate_data_1["$P"] = 0xbfff0028;
+ validate_data_1["$ebx"] = 0xbffefff7;
+ validate_data_1[".cbSavedRegs"] = 4;
+ validate_data_1[".cbParams"] = 4;
+
+ EvaluateTestSet evaluate_test_sets[] = {
+ { &dictionary_0, evaluate_tests_0,
+ sizeof(evaluate_tests_0) / sizeof(EvaluateTest), &validate_data_0 },
+ { &dictionary_1, evaluate_tests_1,
+ sizeof(evaluate_tests_1) / sizeof(EvaluateTest), &validate_data_1 },
+ };
+
+ unsigned int evaluate_test_set_count = sizeof(evaluate_test_sets) /
+ sizeof(EvaluateTestSet);
+
+ FakeMemoryRegion fake_memory;
+ PostfixEvaluator<unsigned int> postfix_evaluator =
+ PostfixEvaluator<unsigned int>(NULL, &fake_memory);
+
+ for (unsigned int evaluate_test_set_index = 0;
+ evaluate_test_set_index < evaluate_test_set_count;
+ ++evaluate_test_set_index) {
+ EvaluateTestSet *evaluate_test_set =
+ &evaluate_test_sets[evaluate_test_set_index];
+ const EvaluateTest *evaluate_tests = evaluate_test_set->evaluate_tests;
+ unsigned int evaluate_test_count = evaluate_test_set->evaluate_test_count;
+
+ // The same dictionary will be used for each test in the set. Earlier
+ // tests can affect the state of the dictionary for later tests.
+ postfix_evaluator.set_dictionary(evaluate_test_set->dictionary);
+
+ // Use a new validity dictionary for each test set.
+ PostfixEvaluator<unsigned int>::DictionaryValidityType assigned;
+
+ for (unsigned int evaluate_test_index = 0;
+ evaluate_test_index < evaluate_test_count;
+ ++evaluate_test_index) {
+ const EvaluateTest *evaluate_test = &evaluate_tests[evaluate_test_index];
+
+ // Do the test.
+ bool result = postfix_evaluator.Evaluate(evaluate_test->expression,
+ &assigned);
+ if (result != evaluate_test->evaluable) {
+ fprintf(stderr, "FAIL: evaluate set %d/%d, test %d/%d, "
+ "expression \"%s\", expected %s, observed %s\n",
+ evaluate_test_set_index, evaluate_test_set_count,
+ evaluate_test_index, evaluate_test_count,
+ evaluate_test->expression.c_str(),
+ evaluate_test->evaluable ? "evaluable" : "not evaluable",
+ result ? "evaluted" : "not evaluated");
+ return false;
+ }
+ }
+
+ // Validate the results.
+ for (map<string, unsigned int>::const_iterator validate_iterator =
+ evaluate_test_set->validate_data->begin();
+ validate_iterator != evaluate_test_set->validate_data->end();
+ ++validate_iterator) {
+ const string identifier = validate_iterator->first;
+ unsigned int expected_value = validate_iterator->second;
+
+ map<string, unsigned int>::const_iterator dictionary_iterator =
+ evaluate_test_set->dictionary->find(identifier);
+
+ // The identifier must exist in the dictionary.
+ if (dictionary_iterator == evaluate_test_set->dictionary->end()) {
+ fprintf(stderr, "FAIL: evaluate test set %d/%d, "
+ "validate identifier \"%s\", "
+ "expected %d, observed not found\n",
+ evaluate_test_set_index, evaluate_test_set_count,
+ identifier.c_str(), expected_value);
+ return false;
+ }
+
+ // The value in the dictionary must be the same as the expected value.
+ unsigned int observed_value = dictionary_iterator->second;
+ if (expected_value != observed_value) {
+ fprintf(stderr, "FAIL: evaluate test set %d/%d, "
+ "validate identifier \"%s\", "
+ "expected %d, observed %d\n",
+ evaluate_test_set_index, evaluate_test_set_count,
+ identifier.c_str(), expected_value, observed_value);
+ return false;
+ }
+
+ // The value must be set in the "assigned" dictionary if it was a
+ // variable. It must not have been assigned if it was a constant.
+ bool expected_assigned = identifier[0] == '$';
+ bool observed_assigned = false;
+ PostfixEvaluator<unsigned int>::DictionaryValidityType::const_iterator
+ iterator_assigned = assigned.find(identifier);
+ if (iterator_assigned != assigned.end()) {
+ observed_assigned = iterator_assigned->second;
+ }
+ if (expected_assigned != observed_assigned) {
+ fprintf(stderr, "FAIL: evaluate test set %d/%d, "
+ "validate assignment of \"%s\", "
+ "expected %d, observed %d\n",
+ evaluate_test_set_index, evaluate_test_set_count,
+ identifier.c_str(), expected_assigned, observed_assigned);
+ return false;
+ }
+ }
+ }
+
+ // EvaluateForValue tests.
+ PostfixEvaluator<unsigned int>::DictionaryType dictionary_2;
+ dictionary_2["$ebp"] = 0xbfff0010;
+ dictionary_2["$eip"] = 0x10000000;
+ dictionary_2["$esp"] = 0xbfff0000;
+ dictionary_2[".cbSavedRegs"] = 4;
+ dictionary_2[".cbParams"] = 4;
+ dictionary_2[".raSearchStart"] = 0xbfff0020;
+ const EvaluateForValueTest evaluate_for_value_tests_2[] = {
+ { "28907223", true, 28907223 }, // simple constant
+ { "89854293 40010015 +", true, 89854293 + 40010015 }, // arithmetic
+ { "-870245 8769343 +", true, 7899098 }, // negative constants
+ { "$ebp $esp - $eip +", true, 0x10000010 }, // variable references
+ { "18929794 34015074", false, 0 }, // too many values
+ { "$ebp $ebp 4 - =", false, 0 }, // too few values
+ { "$new $eip = $new", true, 0x10000000 }, // make new variable
+ { "$new 4 +", true, 0x10000004 }, // see prior assignments
+ { ".cfa 42 = 10", false, 0 } // can't set constants
+ };
+ const int evaluate_for_value_tests_2_size
+ = (sizeof (evaluate_for_value_tests_2)
+ / sizeof (evaluate_for_value_tests_2[0]));
+ map<string, unsigned int> validate_data_2;
+ validate_data_2["$eip"] = 0x10000000;
+ validate_data_2["$ebp"] = 0xbfff000c;
+ validate_data_2["$esp"] = 0xbfff0000;
+ validate_data_2["$new"] = 0x10000000;
+ validate_data_2[".cbSavedRegs"] = 4;
+ validate_data_2[".cbParams"] = 4;
+ validate_data_2[".raSearchStart"] = 0xbfff0020;
+
+ postfix_evaluator.set_dictionary(&dictionary_2);
+ for (int i = 0; i < evaluate_for_value_tests_2_size; i++) {
+ const EvaluateForValueTest *test = &evaluate_for_value_tests_2[i];
+ unsigned int result;
+ if (postfix_evaluator.EvaluateForValue(test->expression, &result)
+ != test->evaluable) {
+ fprintf(stderr, "FAIL: evaluate for value test %d, "
+ "expected evaluation to %s, but it %s\n",
+ i, test->evaluable ? "succeed" : "fail",
+ test->evaluable ? "failed" : "succeeded");
+ return false;
+ }
+ if (test->evaluable && result != test->value) {
+ fprintf(stderr, "FAIL: evaluate for value test %d, "
+ "expected value to be 0x%x, but it was 0x%x\n",
+ i, test->value, result);
+ return false;
+ }
+ }
+
+ for (map<string, unsigned int>::iterator v = validate_data_2.begin();
+ v != validate_data_2.end(); v++) {
+ map<string, unsigned int>::iterator a = dictionary_2.find(v->first);
+ if (a == dictionary_2.end()) {
+ fprintf(stderr, "FAIL: evaluate for value dictionary check: "
+ "expected dict[\"%s\"] to be 0x%x, but it was unset\n",
+ v->first.c_str(), v->second);
+ return false;
+ } else if (a->second != v->second) {
+ fprintf(stderr, "FAIL: evaluate for value dictionary check: "
+ "expected dict[\"%s\"] to be 0x%x, but it was 0x%x\n",
+ v->first.c_str(), v->second, a->second);
+ return false;
+ }
+ dictionary_2.erase(a);
+ }
+
+ map<string, unsigned int>::iterator remaining = dictionary_2.begin();
+ if (remaining != dictionary_2.end()) {
+ fprintf(stderr, "FAIL: evaluation of test expressions put unexpected "
+ "values in dictionary:\n");
+ for (; remaining != dictionary_2.end(); remaining++)
+ fprintf(stderr, " dict[\"%s\"] == 0x%x\n",
+ remaining->first.c_str(), remaining->second);
+ return false;
+ }
+
+ return true;
+}
+
+
+} // namespace
+
+
+int main(int argc, char **argv) {
+ BPLOG_INIT(&argc, &argv);
+
+ return RunTests() ? 0 : 1;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-12 01:05:59 +0000