1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "dwarf_test.h"
18
19 #include "dwarf/dwarf_constants.h"
20 #include "dwarf/debug_frame_opcode_writer.h"
21 #include "dwarf/debug_info_entry_writer.h"
22 #include "dwarf/debug_line_opcode_writer.h"
23 #include "dwarf/headers.h"
24 #include "gtest/gtest.h"
25
26 namespace art {
27 namespace dwarf {
28
29 // Run the tests only on host since we need objdump.
30 #ifndef HAVE_ANDROID_OS
31
32 constexpr CFIFormat kCFIFormat = DW_DEBUG_FRAME_FORMAT;
33
TEST_F(DwarfTest,DebugFrame)34 TEST_F(DwarfTest, DebugFrame) {
35 const bool is64bit = false;
36
37 // Pick offset value which would catch Uleb vs Sleb errors.
38 const int offset = 40000;
39 ASSERT_EQ(UnsignedLeb128Size(offset / 4), 2u);
40 ASSERT_EQ(SignedLeb128Size(offset / 4), 3u);
41 DW_CHECK("Data alignment factor: -4");
42 const Reg reg(6);
43
44 // Test the opcodes in the order mentioned in the spec.
45 // There are usually several encoding variations of each opcode.
46 DebugFrameOpCodeWriter<> opcodes;
47 DW_CHECK("FDE");
48 int pc = 0;
49 for (int i : {0, 1, 0x3F, 0x40, 0xFF, 0x100, 0xFFFF, 0x10000}) {
50 pc += i;
51 opcodes.AdvancePC(pc);
52 }
53 DW_CHECK_NEXT("DW_CFA_advance_loc: 1 to 01000001");
54 DW_CHECK_NEXT("DW_CFA_advance_loc: 63 to 01000040");
55 DW_CHECK_NEXT("DW_CFA_advance_loc1: 64 to 01000080");
56 DW_CHECK_NEXT("DW_CFA_advance_loc1: 255 to 0100017f");
57 DW_CHECK_NEXT("DW_CFA_advance_loc2: 256 to 0100027f");
58 DW_CHECK_NEXT("DW_CFA_advance_loc2: 65535 to 0101027e");
59 DW_CHECK_NEXT("DW_CFA_advance_loc4: 65536 to 0102027e");
60 opcodes.DefCFA(reg, offset);
61 DW_CHECK_NEXT("DW_CFA_def_cfa: r6 (esi) ofs 40000");
62 opcodes.DefCFA(reg, -offset);
63 DW_CHECK_NEXT("DW_CFA_def_cfa_sf: r6 (esi) ofs -40000");
64 opcodes.DefCFARegister(reg);
65 DW_CHECK_NEXT("DW_CFA_def_cfa_register: r6 (esi)");
66 opcodes.DefCFAOffset(offset);
67 DW_CHECK_NEXT("DW_CFA_def_cfa_offset: 40000");
68 opcodes.DefCFAOffset(-offset);
69 DW_CHECK_NEXT("DW_CFA_def_cfa_offset_sf: -40000");
70 uint8_t expr[] = { 0 };
71 opcodes.DefCFAExpression(expr, arraysize(expr));
72 DW_CHECK_NEXT("DW_CFA_def_cfa_expression");
73 opcodes.Undefined(reg);
74 DW_CHECK_NEXT("DW_CFA_undefined: r6 (esi)");
75 opcodes.SameValue(reg);
76 DW_CHECK_NEXT("DW_CFA_same_value: r6 (esi)");
77 opcodes.Offset(Reg(0x3F), -offset);
78 // Bad register likely means that it does not exist on x86,
79 // but we want to test high register numbers anyway.
80 DW_CHECK_NEXT("DW_CFA_offset: bad register: r63 at cfa-40000");
81 opcodes.Offset(Reg(0x40), -offset);
82 DW_CHECK_NEXT("DW_CFA_offset_extended: bad register: r64 at cfa-40000");
83 opcodes.Offset(Reg(0x40), offset);
84 DW_CHECK_NEXT("DW_CFA_offset_extended_sf: bad register: r64 at cfa+40000");
85 opcodes.ValOffset(reg, -offset);
86 DW_CHECK_NEXT("DW_CFA_val_offset: r6 (esi) at cfa-40000");
87 opcodes.ValOffset(reg, offset);
88 DW_CHECK_NEXT("DW_CFA_val_offset_sf: r6 (esi) at cfa+40000");
89 opcodes.Register(reg, Reg(1));
90 DW_CHECK_NEXT("DW_CFA_register: r6 (esi) in r1 (ecx)");
91 opcodes.Expression(reg, expr, arraysize(expr));
92 DW_CHECK_NEXT("DW_CFA_expression: r6 (esi)");
93 opcodes.ValExpression(reg, expr, arraysize(expr));
94 DW_CHECK_NEXT("DW_CFA_val_expression: r6 (esi)");
95 opcodes.Restore(Reg(0x3F));
96 DW_CHECK_NEXT("DW_CFA_restore: bad register: r63");
97 opcodes.Restore(Reg(0x40));
98 DW_CHECK_NEXT("DW_CFA_restore_extended: bad register: r64");
99 opcodes.Restore(reg);
100 DW_CHECK_NEXT("DW_CFA_restore: r6 (esi)");
101 opcodes.RememberState();
102 DW_CHECK_NEXT("DW_CFA_remember_state");
103 opcodes.RestoreState();
104 DW_CHECK_NEXT("DW_CFA_restore_state");
105 opcodes.Nop();
106 DW_CHECK_NEXT("DW_CFA_nop");
107
108 // Also test helpers.
109 opcodes.DefCFA(Reg(4), 100); // ESP
110 DW_CHECK_NEXT("DW_CFA_def_cfa: r4 (esp) ofs 100");
111 opcodes.AdjustCFAOffset(8);
112 DW_CHECK_NEXT("DW_CFA_def_cfa_offset: 108");
113 opcodes.RelOffset(Reg(0), 0); // push R0
114 DW_CHECK_NEXT("DW_CFA_offset: r0 (eax) at cfa-108");
115 opcodes.RelOffset(Reg(1), 4); // push R1
116 DW_CHECK_NEXT("DW_CFA_offset: r1 (ecx) at cfa-104");
117 opcodes.RelOffsetForMany(Reg(2), 8, 1 | (1 << 3), 4); // push R2 and R5
118 DW_CHECK_NEXT("DW_CFA_offset: r2 (edx) at cfa-100");
119 DW_CHECK_NEXT("DW_CFA_offset: r5 (ebp) at cfa-96");
120 opcodes.RestoreMany(Reg(2), 1 | (1 << 3)); // pop R2 and R5
121 DW_CHECK_NEXT("DW_CFA_restore: r2 (edx)");
122 DW_CHECK_NEXT("DW_CFA_restore: r5 (ebp)");
123
124 DebugFrameOpCodeWriter<> initial_opcodes;
125 WriteDebugFrameCIE(is64bit, DW_EH_PE_absptr, Reg(is64bit ? 16 : 8),
126 initial_opcodes, kCFIFormat, &debug_frame_data_);
127 std::vector<uintptr_t> debug_frame_patches;
128 std::vector<uintptr_t> expected_patches { 28 }; // NOLINT
129 WriteDebugFrameFDE(is64bit, 0, 0x01000000, 0x01000000, opcodes.data(),
130 kCFIFormat, &debug_frame_data_, &debug_frame_patches);
131
132 EXPECT_EQ(expected_patches, debug_frame_patches);
133 CheckObjdumpOutput(is64bit, "-W");
134 }
135
TEST_F(DwarfTest,DebugFrame64)136 TEST_F(DwarfTest, DebugFrame64) {
137 constexpr bool is64bit = true;
138 DebugFrameOpCodeWriter<> initial_opcodes;
139 WriteDebugFrameCIE(is64bit, DW_EH_PE_absptr, Reg(16),
140 initial_opcodes, kCFIFormat, &debug_frame_data_);
141 DebugFrameOpCodeWriter<> opcodes;
142 std::vector<uintptr_t> debug_frame_patches;
143 std::vector<uintptr_t> expected_patches { 32 }; // NOLINT
144 WriteDebugFrameFDE(is64bit, 0, 0x0100000000000000, 0x0200000000000000,
145 opcodes.data(), kCFIFormat, &debug_frame_data_, &debug_frame_patches);
146 DW_CHECK("FDE cie=00000000 pc=100000000000000..300000000000000");
147
148 EXPECT_EQ(expected_patches, debug_frame_patches);
149 CheckObjdumpOutput(is64bit, "-W");
150 }
151
152 // Test x86_64 register mapping. It is the only non-trivial architecture.
153 // ARM, X86, and Mips have: dwarf_reg = art_reg + constant.
TEST_F(DwarfTest,x86_64_RegisterMapping)154 TEST_F(DwarfTest, x86_64_RegisterMapping) {
155 constexpr bool is64bit = true;
156 DebugFrameOpCodeWriter<> opcodes;
157 for (int i = 0; i < 16; i++) {
158 opcodes.RelOffset(Reg::X86_64Core(i), 0);
159 }
160 DW_CHECK("FDE");
161 DW_CHECK_NEXT("DW_CFA_offset: r0 (rax)");
162 DW_CHECK_NEXT("DW_CFA_offset: r2 (rcx)");
163 DW_CHECK_NEXT("DW_CFA_offset: r1 (rdx)");
164 DW_CHECK_NEXT("DW_CFA_offset: r3 (rbx)");
165 DW_CHECK_NEXT("DW_CFA_offset: r7 (rsp)");
166 DW_CHECK_NEXT("DW_CFA_offset: r6 (rbp)");
167 DW_CHECK_NEXT("DW_CFA_offset: r4 (rsi)");
168 DW_CHECK_NEXT("DW_CFA_offset: r5 (rdi)");
169 DW_CHECK_NEXT("DW_CFA_offset: r8 (r8)");
170 DW_CHECK_NEXT("DW_CFA_offset: r9 (r9)");
171 DW_CHECK_NEXT("DW_CFA_offset: r10 (r10)");
172 DW_CHECK_NEXT("DW_CFA_offset: r11 (r11)");
173 DW_CHECK_NEXT("DW_CFA_offset: r12 (r12)");
174 DW_CHECK_NEXT("DW_CFA_offset: r13 (r13)");
175 DW_CHECK_NEXT("DW_CFA_offset: r14 (r14)");
176 DW_CHECK_NEXT("DW_CFA_offset: r15 (r15)");
177 DebugFrameOpCodeWriter<> initial_opcodes;
178 WriteDebugFrameCIE(is64bit, DW_EH_PE_absptr, Reg(16),
179 initial_opcodes, kCFIFormat, &debug_frame_data_);
180 std::vector<uintptr_t> debug_frame_patches;
181 WriteDebugFrameFDE(is64bit, 0, 0x0100000000000000, 0x0200000000000000,
182 opcodes.data(), kCFIFormat, &debug_frame_data_, &debug_frame_patches);
183
184 CheckObjdumpOutput(is64bit, "-W");
185 }
186
TEST_F(DwarfTest,DebugLine)187 TEST_F(DwarfTest, DebugLine) {
188 const bool is64bit = false;
189 const int code_factor_bits = 1;
190 DebugLineOpCodeWriter<> opcodes(is64bit, code_factor_bits);
191
192 std::vector<std::string> include_directories;
193 include_directories.push_back("/path/to/source");
194 DW_CHECK("/path/to/source");
195
196 std::vector<FileEntry> files {
197 { "file0.c", 0, 1000, 2000 },
198 { "file1.c", 1, 1000, 2000 },
199 { "file2.c", 1, 1000, 2000 },
200 };
201 DW_CHECK("1\t0\t1000\t2000\tfile0.c");
202 DW_CHECK_NEXT("2\t1\t1000\t2000\tfile1.c");
203 DW_CHECK_NEXT("3\t1\t1000\t2000\tfile2.c");
204
205 DW_CHECK("Line Number Statements");
206 opcodes.SetAddress(0x01000000);
207 DW_CHECK_NEXT("Extended opcode 2: set Address to 0x1000000");
208 opcodes.AddRow();
209 DW_CHECK_NEXT("Copy");
210 opcodes.AdvancePC(0x01000100);
211 DW_CHECK_NEXT("Advance PC by 256 to 0x1000100");
212 opcodes.SetFile(2);
213 DW_CHECK_NEXT("Set File Name to entry 2 in the File Name Table");
214 opcodes.AdvanceLine(3);
215 DW_CHECK_NEXT("Advance Line by 2 to 3");
216 opcodes.SetColumn(4);
217 DW_CHECK_NEXT("Set column to 4");
218 opcodes.NegateStmt();
219 DW_CHECK_NEXT("Set is_stmt to 0");
220 opcodes.SetBasicBlock();
221 DW_CHECK_NEXT("Set basic block");
222 opcodes.SetPrologueEnd();
223 DW_CHECK_NEXT("Set prologue_end to true");
224 opcodes.SetEpilogueBegin();
225 DW_CHECK_NEXT("Set epilogue_begin to true");
226 opcodes.SetISA(5);
227 DW_CHECK_NEXT("Set ISA to 5");
228 opcodes.EndSequence();
229 DW_CHECK_NEXT("Extended opcode 1: End of Sequence");
230 opcodes.DefineFile("file.c", 0, 1000, 2000);
231 DW_CHECK_NEXT("Extended opcode 3: define new File Table entry");
232 DW_CHECK_NEXT("Entry\tDir\tTime\tSize\tName");
233 DW_CHECK_NEXT("1\t0\t1000\t2000\tfile.c");
234
235 std::vector<uintptr_t> debug_line_patches;
236 std::vector<uintptr_t> expected_patches { 87 }; // NOLINT
237 WriteDebugLineTable(include_directories, files, opcodes,
238 &debug_line_data_, &debug_line_patches);
239
240 EXPECT_EQ(expected_patches, debug_line_patches);
241 CheckObjdumpOutput(is64bit, "-W");
242 }
243
244 // DWARF has special one byte codes which advance PC and line at the same time.
TEST_F(DwarfTest,DebugLineSpecialOpcodes)245 TEST_F(DwarfTest, DebugLineSpecialOpcodes) {
246 const bool is64bit = false;
247 const int code_factor_bits = 1;
248 uint32_t pc = 0x01000000;
249 int line = 1;
250 DebugLineOpCodeWriter<> opcodes(is64bit, code_factor_bits);
251 opcodes.SetAddress(pc);
252 size_t num_rows = 0;
253 DW_CHECK("Line Number Statements:");
254 DW_CHECK("Special opcode");
255 DW_CHECK("Advance PC by constant");
256 DW_CHECK("Decoded dump of debug contents of section .debug_line:");
257 DW_CHECK("Line number Starting address");
258 for (int addr_delta = 0; addr_delta < 80; addr_delta += 2) {
259 for (int line_delta = 16; line_delta >= -16; --line_delta) {
260 pc += addr_delta;
261 line += line_delta;
262 opcodes.AddRow(pc, line);
263 num_rows++;
264 ASSERT_EQ(opcodes.CurrentAddress(), pc);
265 ASSERT_EQ(opcodes.CurrentLine(), line);
266 char expected[1024];
267 sprintf(expected, "%i 0x%x", line, pc);
268 DW_CHECK_NEXT(expected);
269 }
270 }
271 EXPECT_LT(opcodes.data()->size(), num_rows * 3);
272
273 std::vector<std::string> directories;
274 std::vector<FileEntry> files { { "file.c", 0, 1000, 2000 } }; // NOLINT
275 std::vector<uintptr_t> debug_line_patches;
276 WriteDebugLineTable(directories, files, opcodes,
277 &debug_line_data_, &debug_line_patches);
278
279 CheckObjdumpOutput(is64bit, "-W -WL");
280 }
281
TEST_F(DwarfTest,DebugInfo)282 TEST_F(DwarfTest, DebugInfo) {
283 constexpr bool is64bit = false;
284 DebugInfoEntryWriter<> info(is64bit, &debug_abbrev_data_);
285 DW_CHECK("Contents of the .debug_info section:");
286 info.StartTag(dwarf::DW_TAG_compile_unit, dwarf::DW_CHILDREN_yes);
287 DW_CHECK("Abbrev Number: 1 (DW_TAG_compile_unit)");
288 info.WriteStrp(dwarf::DW_AT_producer, "Compiler name", &debug_str_data_);
289 DW_CHECK_NEXT("DW_AT_producer : (indirect string, offset: 0x0): Compiler name");
290 info.WriteAddr(dwarf::DW_AT_low_pc, 0x01000000);
291 DW_CHECK_NEXT("DW_AT_low_pc : 0x1000000");
292 info.WriteAddr(dwarf::DW_AT_high_pc, 0x02000000);
293 DW_CHECK_NEXT("DW_AT_high_pc : 0x2000000");
294 info.StartTag(dwarf::DW_TAG_subprogram, dwarf::DW_CHILDREN_no);
295 DW_CHECK("Abbrev Number: 2 (DW_TAG_subprogram)");
296 info.WriteStrp(dwarf::DW_AT_name, "Foo", &debug_str_data_);
297 DW_CHECK_NEXT("DW_AT_name : (indirect string, offset: 0xe): Foo");
298 info.WriteAddr(dwarf::DW_AT_low_pc, 0x01010000);
299 DW_CHECK_NEXT("DW_AT_low_pc : 0x1010000");
300 info.WriteAddr(dwarf::DW_AT_high_pc, 0x01020000);
301 DW_CHECK_NEXT("DW_AT_high_pc : 0x1020000");
302 info.EndTag(); // DW_TAG_subprogram
303 info.StartTag(dwarf::DW_TAG_subprogram, dwarf::DW_CHILDREN_no);
304 DW_CHECK("Abbrev Number: 2 (DW_TAG_subprogram)");
305 info.WriteStrp(dwarf::DW_AT_name, "Bar", &debug_str_data_);
306 DW_CHECK_NEXT("DW_AT_name : (indirect string, offset: 0x12): Bar");
307 info.WriteAddr(dwarf::DW_AT_low_pc, 0x01020000);
308 DW_CHECK_NEXT("DW_AT_low_pc : 0x1020000");
309 info.WriteAddr(dwarf::DW_AT_high_pc, 0x01030000);
310 DW_CHECK_NEXT("DW_AT_high_pc : 0x1030000");
311 info.EndTag(); // DW_TAG_subprogram
312 info.EndTag(); // DW_TAG_compile_unit
313 // Test that previous list was properly terminated and empty children.
314 info.StartTag(dwarf::DW_TAG_compile_unit, dwarf::DW_CHILDREN_yes);
315 info.EndTag(); // DW_TAG_compile_unit
316
317 // The abbrev table is just side product, but check it as well.
318 DW_CHECK("Abbrev Number: 3 (DW_TAG_compile_unit)");
319 DW_CHECK("Contents of the .debug_abbrev section:");
320 DW_CHECK("1 DW_TAG_compile_unit [has children]");
321 DW_CHECK_NEXT("DW_AT_producer DW_FORM_strp");
322 DW_CHECK_NEXT("DW_AT_low_pc DW_FORM_addr");
323 DW_CHECK_NEXT("DW_AT_high_pc DW_FORM_addr");
324 DW_CHECK("2 DW_TAG_subprogram [no children]");
325 DW_CHECK_NEXT("DW_AT_name DW_FORM_strp");
326 DW_CHECK_NEXT("DW_AT_low_pc DW_FORM_addr");
327 DW_CHECK_NEXT("DW_AT_high_pc DW_FORM_addr");
328 DW_CHECK("3 DW_TAG_compile_unit [has children]");
329
330 std::vector<uintptr_t> debug_info_patches;
331 std::vector<uintptr_t> expected_patches { 16, 20, 29, 33, 42, 46 }; // NOLINT
332 dwarf::WriteDebugInfoCU(0 /* debug_abbrev_offset */, info,
333 &debug_info_data_, &debug_info_patches);
334
335 EXPECT_EQ(expected_patches, debug_info_patches);
336 CheckObjdumpOutput(is64bit, "-W");
337 }
338
339 #endif // HAVE_ANDROID_OS
340
341 } // namespace dwarf
342 } // namespace art
343