Build live-in, live-out and kill sets for each block.
This information will be used when computing live ranges of
instructions.
Change-Id: I345ee833c1ccb4a8e725c7976453f6d58d350d74
diff --git a/compiler/optimizing/liveness_test.cc b/compiler/optimizing/liveness_test.cc
new file mode 100644
index 0000000..aa4d35e
--- /dev/null
+++ b/compiler/optimizing/liveness_test.cc
@@ -0,0 +1,515 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include "builder.h"
+#include "dex_file.h"
+#include "dex_instruction.h"
+#include "nodes.h"
+#include "optimizing_unit_test.h"
+#include "ssa_liveness_analysis.h"
+#include "utils/arena_allocator.h"
+
+#include "gtest/gtest.h"
+
+namespace art {
+
+static void TestCode(const uint16_t* data, const char* expected) {
+ ArenaPool pool;
+ ArenaAllocator allocator(&pool);
+ HGraphBuilder builder(&allocator);
+ const DexFile::CodeItem* item = reinterpret_cast<const DexFile::CodeItem*>(data);
+ HGraph* graph = builder.BuildGraph(*item);
+ ASSERT_NE(graph, nullptr);
+ graph->BuildDominatorTree();
+ graph->TransformToSSA();
+ SsaLivenessAnalysis liveness(*graph);
+ liveness.Analyze();
+
+ std::ostringstream buffer;
+ for (HInsertionOrderIterator it(*graph); !it.Done(); it.Advance()) {
+ HBasicBlock* block = it.Current();
+ buffer << "Block " << block->GetBlockId() << std::endl;
+ BitVector* live_in = liveness.GetLiveInSet(*block);
+ live_in->Dump(buffer, " live in: ");
+ BitVector* live_out = liveness.GetLiveOutSet(*block);
+ live_out->Dump(buffer, " live out: ");
+ BitVector* kill = liveness.GetKillSet(*block);
+ kill->Dump(buffer, " kill: ");
+ }
+ ASSERT_STREQ(expected, buffer.str().c_str());
+}
+
+TEST(LivenessTest, CFG1) {
+ const char* expected =
+ "Block 0\n"
+ " live in: ()\n"
+ " live out: ()\n"
+ " kill: ()\n"
+ "Block 1\n"
+ " live in: ()\n"
+ " live out: ()\n"
+ " kill: ()\n"
+ "Block 2\n"
+ " live in: ()\n"
+ " live out: ()\n"
+ " kill: ()\n";
+
+ // Constant is not used.
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::RETURN_VOID);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, CFG2) {
+ const char* expected =
+ "Block 0\n"
+ " live in: (0)\n"
+ " live out: (1)\n"
+ " kill: (1)\n"
+ "Block 1\n"
+ " live in: (1)\n"
+ " live out: (0)\n"
+ " kill: (0)\n"
+ "Block 2\n"
+ " live in: (0)\n"
+ " live out: (0)\n"
+ " kill: (0)\n";
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::RETURN);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, CFG3) {
+ const char* expected =
+ "Block 0\n" // entry block
+ " live in: (000)\n"
+ " live out: (110)\n"
+ " kill: (110)\n"
+ "Block 1\n" // block with add
+ " live in: (110)\n"
+ " live out: (001)\n"
+ " kill: (001)\n"
+ "Block 2\n" // block with return
+ " live in: (001)\n"
+ " live out: (000)\n"
+ " kill: (000)\n"
+ "Block 3\n" // exit block
+ " live in: (000)\n"
+ " live out: (000)\n"
+ " kill: (000)\n";
+
+ const uint16_t data[] = TWO_REGISTERS_CODE_ITEM(
+ Instruction::CONST_4 | 3 << 12 | 0,
+ Instruction::CONST_4 | 4 << 12 | 1 << 8,
+ Instruction::ADD_INT_2ADDR | 1 << 12,
+ Instruction::GOTO | 0x100,
+ Instruction::RETURN);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, CFG4) {
+ // var a;
+ // if (0 == 0) {
+ // a = 5;
+ // } else {
+ // a = 4;
+ // }
+ // return a;
+ //
+ // Bitsets are made of:
+ // (constant0, constant4, constant5, phi, equal test)
+ const char* expected =
+ "Block 0\n" // entry block
+ " live in: (00000)\n"
+ " live out: (11100)\n"
+ " kill: (11100)\n"
+ "Block 1\n" // block with if
+ " live in: (11100)\n"
+ " live out: (01100)\n"
+ " kill: (00010)\n"
+ "Block 2\n" // else block
+ " live in: (01000)\n"
+ " live out: (00000)\n"
+ " kill: (00000)\n"
+ "Block 3\n" // then block
+ " live in: (00100)\n"
+ " live out: (00000)\n"
+ " kill: (00000)\n"
+ "Block 4\n" // return block
+ " live in: (00000)\n"
+ " live out: (00000)\n"
+ " kill: (00001)\n"
+ "Block 5\n" // exit block
+ " live in: (00000)\n"
+ " live out: (00000)\n"
+ " kill: (00000)\n";
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::IF_EQ, 4,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::GOTO | 0x200,
+ Instruction::CONST_4 | 5 << 12 | 0,
+ Instruction::RETURN | 0 << 8);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, CFG5) {
+ // var a = 0;
+ // if (0 == 0) {
+ // } else {
+ // a = 4;
+ // }
+ // return a;
+ const char* expected =
+ "Block 0\n" // entry block
+ " live in: (0000)\n"
+ " live out: (1100)\n"
+ " kill: (1100)\n"
+ "Block 1\n" // block with if
+ " live in: (1100)\n"
+ " live out: (0100)\n"
+ " kill: (0010)\n"
+ "Block 2\n" // else block
+ " live in: (0100)\n"
+ " live out: (0000)\n"
+ " kill: (0000)\n"
+ "Block 3\n" // return block
+ " live in: (0000)\n"
+ " live out: (0000)\n"
+ " kill: (0001)\n"
+ "Block 4\n" // exit block
+ " live in: (0000)\n"
+ " live out: (0000)\n"
+ " kill: (0000)\n";
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::IF_EQ, 3,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::RETURN | 0 << 8);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, Loop1) {
+ // Simple loop with one preheader and one back edge.
+ // var a = 0;
+ // while (a == a) {
+ // a = 4;
+ // }
+ // return;
+ const char* expected =
+ "Block 0\n" // entry block
+ " live in: (0000)\n"
+ " live out: (1100)\n"
+ " kill: (1100)\n"
+ "Block 1\n" // pre header
+ " live in: (1100)\n"
+ " live out: (0100)\n"
+ " kill: (0000)\n"
+ "Block 2\n" // loop header
+ " live in: (0100)\n"
+ " live out: (0100)\n"
+ " kill: (0011)\n"
+ "Block 3\n" // back edge
+ " live in: (0100)\n"
+ " live out: (0100)\n"
+ " kill: (0000)\n"
+ "Block 4\n" // return block
+ " live in: (0000)\n"
+ " live out: (0000)\n"
+ " kill: (0000)\n"
+ "Block 5\n" // exit block
+ " live in: (0000)\n"
+ " live out: (0000)\n"
+ " kill: (0000)\n";
+
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::IF_EQ, 4,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::GOTO | 0xFD00,
+ Instruction::RETURN_VOID);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, Loop3) {
+ // Test that the returned value stays live in a preceding loop.
+ // var a = 0;
+ // while (a == a) {
+ // a = 4;
+ // }
+ // return 5;
+ const char* expected =
+ "Block 0\n"
+ " live in: (00000)\n"
+ " live out: (11100)\n"
+ " kill: (11100)\n"
+ "Block 1\n"
+ " live in: (11100)\n"
+ " live out: (01100)\n"
+ " kill: (00000)\n"
+ "Block 2\n" // loop header
+ " live in: (01100)\n"
+ " live out: (01100)\n"
+ " kill: (00011)\n"
+ "Block 3\n" // back edge
+ " live in: (01100)\n"
+ " live out: (01100)\n"
+ " kill: (00000)\n"
+ "Block 4\n" // return block
+ " live in: (00100)\n"
+ " live out: (00000)\n"
+ " kill: (00000)\n"
+ "Block 5\n" // exit block
+ " live in: (00000)\n"
+ " live out: (00000)\n"
+ " kill: (00000)\n";
+
+ const uint16_t data[] = TWO_REGISTERS_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::IF_EQ, 4,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::GOTO | 0xFD00,
+ Instruction::CONST_4 | 5 << 12 | 1 << 8,
+ Instruction::RETURN | 1 << 8);
+
+ TestCode(data, expected);
+}
+
+
+TEST(LivenessTest, Loop4) {
+ // Make sure we support a preheader of a loop not being the first predecessor
+ // in the predecessor list of the header.
+ // var a = 0;
+ // while (a == a) {
+ // a = 4;
+ // }
+ // return a;
+ // Bitsets are made of:
+ // (constant0, constant4, phi, equal test)
+ const char* expected =
+ "Block 0\n"
+ " live in: (0000)\n"
+ " live out: (1100)\n"
+ " kill: (1100)\n"
+ "Block 1\n"
+ " live in: (1100)\n"
+ " live out: (1100)\n"
+ " kill: (0000)\n"
+ "Block 2\n" // loop header
+ " live in: (0100)\n"
+ " live out: (0110)\n"
+ " kill: (0011)\n"
+ "Block 3\n" // back edge
+ " live in: (0100)\n"
+ " live out: (0100)\n"
+ " kill: (0000)\n"
+ "Block 4\n" // pre loop header
+ " live in: (1100)\n"
+ " live out: (0100)\n"
+ " kill: (0000)\n"
+ "Block 5\n" // return block
+ " live in: (0010)\n"
+ " live out: (0000)\n"
+ " kill: (0000)\n"
+ "Block 6\n" // exit block
+ " live in: (0000)\n"
+ " live out: (0000)\n"
+ " kill: (0000)\n";
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::GOTO | 0x500,
+ Instruction::IF_EQ, 5,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::GOTO | 0xFD00,
+ Instruction::GOTO | 0xFC00,
+ Instruction::RETURN | 0 << 8);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, Loop5) {
+ // Make sure we create a preheader of a loop when a header originally has two
+ // incoming blocks and one back edge.
+ // Bitsets are made of:
+ // (constant0, constant4, constant5, equal in block 1, phi in block 8, phi in block 4,
+ // equal in block 4)
+ const char* expected =
+ "Block 0\n"
+ " live in: (0000000)\n"
+ " live out: (1110000)\n"
+ " kill: (1110000)\n"
+ "Block 1\n"
+ " live in: (1110000)\n"
+ " live out: (0110000)\n"
+ " kill: (0001000)\n"
+ "Block 2\n"
+ " live in: (0100000)\n"
+ " live out: (0000000)\n"
+ " kill: (0000000)\n"
+ "Block 3\n"
+ " live in: (0010000)\n"
+ " live out: (0000000)\n"
+ " kill: (0000000)\n"
+ "Block 4\n" // loop header
+ " live in: (0000000)\n"
+ " live out: (0000010)\n"
+ " kill: (0000011)\n"
+ "Block 5\n" // back edge
+ " live in: (0000010)\n"
+ " live out: (0000000)\n"
+ " kill: (0000000)\n"
+ "Block 6\n" // return block
+ " live in: (0000010)\n"
+ " live out: (0000000)\n"
+ " kill: (0000000)\n"
+ "Block 7\n" // exit block
+ " live in: (0000000)\n"
+ " live out: (0000000)\n"
+ " kill: (0000000)\n"
+ "Block 8\n" // synthesized pre header
+ " live in: (0000000)\n"
+ " live out: (0000000)\n"
+ " kill: (0000100)\n";
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::IF_EQ, 4,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::GOTO | 0x200,
+ Instruction::CONST_4 | 5 << 12 | 0,
+ Instruction::IF_EQ, 3,
+ Instruction::GOTO | 0xFE00,
+ Instruction::RETURN | 0 << 8);
+
+ TestCode(data, expected);
+}
+
+TEST(LivenessTest, Loop6) {
+ // Bitsets are made of:
+ // (constant0, constant4, constant5, phi in block 2, equal in block 2, equal in block 3)
+ const char* expected =
+ "Block 0\n"
+ " live in: (000000)\n"
+ " live out: (111000)\n"
+ " kill: (111000)\n"
+ "Block 1\n"
+ " live in: (111000)\n"
+ " live out: (011000)\n"
+ " kill: (000000)\n"
+ "Block 2\n" // loop header
+ " live in: (011000)\n"
+ " live out: (011100)\n"
+ " kill: (000110)\n"
+ "Block 3\n"
+ " live in: (011000)\n"
+ " live out: (011000)\n"
+ " kill: (000001)\n"
+ "Block 4\n" // back edge
+ " live in: (011000)\n"
+ " live out: (011000)\n"
+ " kill: (000000)\n"
+ "Block 5\n" // back edge
+ " live in: (011000)\n"
+ " live out: (011000)\n"
+ " kill: (000000)\n"
+ "Block 6\n" // return block
+ " live in: (000100)\n"
+ " live out: (000000)\n"
+ " kill: (000000)\n"
+ "Block 7\n" // exit block
+ " live in: (000000)\n"
+ " live out: (000000)\n"
+ " kill: (000000)\n";
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::IF_EQ, 8,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::IF_EQ, 4,
+ Instruction::CONST_4 | 5 << 12 | 0,
+ Instruction::GOTO | 0xFA00,
+ Instruction::GOTO | 0xF900,
+ Instruction::RETURN | 0 << 8);
+
+ TestCode(data, expected);
+}
+
+
+TEST(LivenessTest, Loop7) {
+ // Bitsets are made of:
+ // (constant0, constant4, constant5, phi in block 2, equal in block 2, equal in block 3,
+ // phi in block 6)
+ const char* expected =
+ "Block 0\n"
+ " live in: (0000000)\n"
+ " live out: (1110000)\n"
+ " kill: (1110000)\n"
+ "Block 1\n"
+ " live in: (1110000)\n"
+ " live out: (0110000)\n"
+ " kill: (0000000)\n"
+ "Block 2\n" // loop header
+ " live in: (0110000)\n"
+ " live out: (0110000)\n"
+ " kill: (0001100)\n"
+ "Block 3\n"
+ " live in: (0110000)\n"
+ " live out: (0110000)\n"
+ " kill: (0000010)\n"
+ "Block 4\n" // loop exit
+ " live in: (0010000)\n"
+ " live out: (0000000)\n"
+ " kill: (0000000)\n"
+ "Block 5\n" // back edge
+ " live in: (0110000)\n"
+ " live out: (0110000)\n"
+ " kill: (0000000)\n"
+ "Block 6\n" // return block
+ " live in: (0000000)\n"
+ " live out: (0000000)\n"
+ " kill: (0000001)\n"
+ "Block 7\n" // exit block
+ " live in: (0000000)\n"
+ " live out: (0000000)\n"
+ " kill: (0000000)\n";
+
+ const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
+ Instruction::CONST_4 | 0 | 0,
+ Instruction::IF_EQ, 8,
+ Instruction::CONST_4 | 4 << 12 | 0,
+ Instruction::IF_EQ, 4,
+ Instruction::CONST_4 | 5 << 12 | 0,
+ Instruction::GOTO | 0x0200,
+ Instruction::GOTO | 0xF900,
+ Instruction::RETURN | 0 << 8);
+
+ TestCode(data, expected);
+}
+
+} // namespace art