eden-emu/breakpad
20
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Handle frame pointer omission (), part 2: PostfixEvaluator. r=bryner.

Browse source 
- A postfix (reverse-Polish) notation expression evaluator that we can
   feed stack-frame debug information into, crank, and get pointers to
   the calling frame from.

a1d6c5d1fd


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@32 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
mmentovai 2006-09-22 00:42:23 +00:00
parent 7daf246e4b
commit b934bb974a
5 changed files with 654 additions and 0 deletions

248
src/processor/postfix_evaluator_unittest.cc Normal file
View file

@ -0,0 +1,248 @@
// Copyright (C) 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// postfix_evaluator_unittest.cc: Unit tests for PostfixEvaluator.
//
// Author: Mark Mentovai
#include <cstdio>
#include <map>
#include <string>
#include "google/airbag_types.h"
#include "processor/memory_region.h"
#include "processor/postfix_evaluator-inl.h"
using std::map;
using std::string;
using google_airbag::MemoryRegion;
using google_airbag::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 u_int64_t GetBase() { return 0; }
virtual u_int32_t GetSize() { return 0; }
virtual bool GetMemoryAtAddress(u_int64_t address, u_int8_t *value)
{ *value = address + 1; return true; }
virtual bool GetMemoryAtAddress(u_int64_t address, u_int16_t *value)
{ *value = address + 1; return true; }
virtual bool GetMemoryAtAddress(u_int64_t address, u_int32_t *value)
{ *value = address + 1; return true; }
virtual bool GetMemoryAtAddress(u_int64_t address, u_int64_t *value)
{ *value = address + 1; return true; }
};
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.
map<string, unsigned int> *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;
};
bool RunTests() {
// The first test set checks the basic operations and failure modes.
map<string, unsigned int> 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 } // $rDeref = ^9 = 10 (FakeMemoryRegion)
};
map<string, unsigned int> validate_data_0;
validate_data_0["$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;
// 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.
map<string, unsigned int> 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);
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);
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;
}
}
}
return true;
}
int main(int argc, char **argv) {
return RunTests() ? 0 : 1;
}