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// Copyright 2008 Google Inc.
// Author: Lincoln Smith
//
// 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.
//
// Unit tests for struct VCDiffCodeTableData, found in codetable.h.
#include <config.h>
#include "codetable.h"
#include "addrcache.h"
#include "testing.h"
namespace open_vcdiff {
namespace {
class CodeTableTest : public testing::Test {
protected:
CodeTableTest()
: code_table_data_(VCDiffCodeTableData::kDefaultCodeTableData) { }
virtual ~CodeTableTest() { }
virtual void SetUp() {
// Default code table must pass
EXPECT_TRUE(ValidateCodeTable());
}
static void AddExerciseOpcode(unsigned char inst1,
unsigned char mode1,
unsigned char size1,
unsigned char inst2,
unsigned char mode2,
unsigned char size2,
int opcode) {
g_exercise_code_table_->inst1[opcode] = inst1;
g_exercise_code_table_->mode1[opcode] = mode1;
g_exercise_code_table_->size1[opcode] = (inst1 == VCD_NOOP) ? 0 : size1;
g_exercise_code_table_->inst2[opcode] = inst2;
g_exercise_code_table_->mode2[opcode] = mode2;
g_exercise_code_table_->size2[opcode] = (inst2 == VCD_NOOP) ? 0 : size2;
}
static void SetUpTestCase() {
g_exercise_code_table_ = new VCDiffCodeTableData;
int opcode = 0;
for (unsigned char inst_mode1 = 0;
inst_mode1 <= VCD_LAST_INSTRUCTION_TYPE + kLastExerciseMode;
++inst_mode1) {
unsigned char inst1 = inst_mode1;
unsigned char mode1 = 0;
if (inst_mode1 > VCD_COPY) {
inst1 = VCD_COPY;
mode1 = inst_mode1 - VCD_COPY;
}
for (unsigned char inst_mode2 = 0;
inst_mode2 <= VCD_LAST_INSTRUCTION_TYPE + kLastExerciseMode;
++inst_mode2) {
unsigned char inst2 = inst_mode2;
unsigned char mode2 = 0;
if (inst_mode2 > VCD_COPY) {
inst2 = VCD_COPY;
mode2 = inst_mode2 - VCD_COPY;
}
AddExerciseOpcode(inst1, mode1, 0, inst2, mode2, 0, opcode++);
AddExerciseOpcode(inst1, mode1, 0, inst2, mode2, 255, opcode++);
AddExerciseOpcode(inst1, mode1, 255, inst2, mode2, 0, opcode++);
AddExerciseOpcode(inst1, mode1, 255, inst2, mode2, 255, opcode++);
}
}
// This is a CHECK rather than an EXPECT because it validates only
// the logic of the test, not of the code being tested.
CHECK_EQ(VCDiffCodeTableData::kCodeTableSize, opcode);
EXPECT_TRUE(VCDiffCodeTableData::kDefaultCodeTableData.Validate());
EXPECT_TRUE(g_exercise_code_table_->Validate(kLastExerciseMode));
}
static void TearDownTestCase() {
delete g_exercise_code_table_;
}
void VerifyInstruction(unsigned char opcode,
unsigned char inst,
unsigned char size,
unsigned char mode) {
EXPECT_EQ(inst, code_table_data_.inst1[opcode]);
EXPECT_EQ(size, code_table_data_.size1[opcode]);
EXPECT_EQ(mode, code_table_data_.mode1[opcode]);
EXPECT_EQ(VCD_NOOP, code_table_data_.inst2[opcode]);
EXPECT_EQ(0, code_table_data_.size2[opcode]);
EXPECT_EQ(0, code_table_data_.mode2[opcode]);
}
bool ValidateCodeTable() {
return code_table_data_.Validate();
}
// This value is designed so that the total number of inst values and modes
// will equal 8 (VCD_NOOP, VCD_ADD, VCD_RUN, VCD_COPY modes 0 - 4).
// Eight combinations of inst and mode, times two possible size values,
// squared (because there are two instructions per opcode), makes
// exactly 256 possible instruction combinations, which fits kCodeTableSize
// (the number of opcodes in the table.)
static const int kLastExerciseMode = 4;
// A code table that exercises as many combinations as possible:
// 2 instructions, each is a NOOP, ADD, RUN, or one of 5 copy modes
// (== 8 total combinations of inst and mode), and each has
// size == 0 or 255 (2 possibilities.)
static VCDiffCodeTableData* g_exercise_code_table_;
// The code table used by the current test.
VCDiffCodeTableData code_table_data_;
};
VCDiffCodeTableData* CodeTableTest::g_exercise_code_table_ = NULL;
// These tests make sure that ValidateCodeTable() catches particular
// error conditions in a custom code table.
// All possible combinations of inst and mode should have an opcode with size 0.
TEST_F(CodeTableTest, MissingCopyMode) {
VerifyInstruction(/* opcode */ 131, VCD_COPY, /* size */ 0, /* mode */ 7);
code_table_data_.size1[131] = 0xFF;
// Now there is no opcode expressing COPY with mode 7 and size 0.
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, MissingAdd) {
VerifyInstruction(/* opcode */ 1, VCD_ADD, /* size */ 0, /* mode */ 0);
code_table_data_.size1[1] = 0xFF; // Add size 0 => size 255
// Now there is no opcode expressing ADD with size 0.
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, MissingRun) {
VerifyInstruction(/* opcode */ 0, VCD_RUN, /* size */ 0, /* mode */ 0);
code_table_data_.size1[0] = 0xFF; // Run size 0 => size 255
// Now there is no opcode expressing RUN with size 0.
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, BadOpcode) {
VerifyInstruction(/* opcode */ 0, VCD_RUN, /* size */ 0, /* mode */ 0);
code_table_data_.inst1[0] = VCD_LAST_INSTRUCTION_TYPE + 1;
EXPECT_FALSE(ValidateCodeTable());
code_table_data_.inst1[0] = 0xFF;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, BadMode) {
VerifyInstruction(/* opcode */ 131, VCD_COPY, /* size */ 0, /* mode */ 7);
code_table_data_.mode1[131] = VCDiffAddressCache::DefaultLastMode() + 1;
EXPECT_FALSE(ValidateCodeTable());
code_table_data_.mode1[131] = 0xFF;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, AddWithNonzeroMode) {
VerifyInstruction(/* opcode */ 1, VCD_ADD, /* size */ 0, /* mode */ 0);
code_table_data_.mode1[1] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, RunWithNonzeroMode) {
VerifyInstruction(/* opcode */ 0, VCD_RUN, /* size */ 0, /* mode */ 0);
code_table_data_.mode1[0] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, NoOpWithNonzeroMode) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
code_table_data_.inst1[20] = VCD_NOOP;
code_table_data_.mode1[20] = 0;
code_table_data_.size1[20] = 0;
EXPECT_TRUE(ValidateCodeTable());
code_table_data_.mode1[20] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, NoOpWithNonzeroSize) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
code_table_data_.inst1[20] = VCD_NOOP;
code_table_data_.mode1[20] = 0;
code_table_data_.size1[20] = 0;
EXPECT_TRUE(ValidateCodeTable());
code_table_data_.size1[20] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, BadSecondOpcode) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
code_table_data_.inst2[20] = VCD_LAST_INSTRUCTION_TYPE + 1;
EXPECT_FALSE(ValidateCodeTable());
code_table_data_.inst2[20] = 0xFF;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, BadSecondMode) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
code_table_data_.inst2[20] = VCD_COPY;
EXPECT_TRUE(ValidateCodeTable());
code_table_data_.mode2[20] = VCDiffAddressCache::DefaultLastMode() + 1;
EXPECT_FALSE(ValidateCodeTable());
code_table_data_.mode2[20] = 0xFF;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, AddSecondWithNonzeroMode) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
code_table_data_.inst2[20] = VCD_ADD;
EXPECT_TRUE(ValidateCodeTable());
code_table_data_.mode2[20] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, RunSecondWithNonzeroMode) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
code_table_data_.inst2[20] = VCD_RUN;
EXPECT_TRUE(ValidateCodeTable());
code_table_data_.mode2[20] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, SecondNoOpWithNonzeroMode) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
EXPECT_EQ(VCD_NOOP, code_table_data_.inst2[20]);
code_table_data_.mode2[20] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, SecondNoOpWithNonzeroSize) {
VerifyInstruction(/* opcode */ 20, VCD_COPY, /* size */ 4, /* mode */ 0);
EXPECT_EQ(VCD_NOOP, code_table_data_.inst2[20]);
code_table_data_.size2[20] = 1;
EXPECT_FALSE(ValidateCodeTable());
}
TEST_F(CodeTableTest, ValidateExerciseCodeTable) {
EXPECT_TRUE(g_exercise_code_table_->Validate(kLastExerciseMode));
}
} // unnamed namespace
} // namespace open_vcdiff
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