| ## Show that when "DATA" is used with an address, it forces the found location |
| ## to be symbolized as data, including the source information. |
| |
| # RUN: yaml2obj %s -o %t.so |
| |
| # RUN: llvm-symbolizer 'DATA 0x304d0' 'DATA 0x304d1' 'DATA 0x304d3' \ |
| # RUN: 'DATA 0x304c0' 'DATA 0x304c8' 'DATA 0x304d4' 'DATA 0x304dc' \ |
| # RUN: 'DATA 0x304d8' --obj=%t.so | FileCheck %s |
| |
| # CHECK: bss_global |
| # CHECK-NEXT: {{[0-9]+}} 4 |
| # CHECK-NEXT: /tmp/file.cpp:1 |
| # CHECK-EMPTY: |
| |
| ## Check that lookups in the middle of the symbol are also resolved correctly. |
| # CHECK: bss_global |
| # CHECK-NEXT: {{[0-9]+}} 4 |
| # CHECK-NEXT: /tmp/file.cpp:1 |
| # CHECK-EMPTY: |
| # CHECK: bss_global |
| # CHECK-NEXT: {{[0-9]+}} 4 |
| # CHECK-NEXT: /tmp/file.cpp:1 |
| # CHECK-EMPTY: |
| |
| ## Now, the remainder of the symbols. |
| # CHECK-NEXT: data_global |
| # CHECK-NEXT: {{[0-9]+}} 4 |
| # CHECK-NEXT: /tmp/file.cpp:2 |
| # CHECK-EMPTY: |
| # CHECK-NEXT: str |
| # CHECK-NEXT: {{[0-9]+}} 8 |
| # CHECK-NEXT: /tmp/file.cpp:4 |
| # CHECK-EMPTY: |
| # CHECK-NEXT: f()::function_global |
| # CHECK-NEXT: {{[0-9]+}} 4 |
| # CHECK-NEXT: /tmp/file.cpp:8 |
| # CHECK-EMPTY: |
| |
| ## Including the one that includes an addend. |
| # CHECK-NEXT: alpha |
| # CHECK-NEXT: {{[0-9]+}} 4 |
| # CHECK-NEXT: /tmp/file.cpp:12 |
| # CHECK-EMPTY: |
| # CHECK-NEXT: beta |
| # CHECK-NEXT: {{[0-9]+}} 4 |
| # CHECK-NEXT: /tmp/file.cpp:13 |
| # CHECK-EMPTY: |
| |
| ## Ensure there's still a global that's offset-based. |
| # RUN: llvm-dwarfdump --debug-info %t.so | FileCheck %s --check-prefix=OFFSET |
| |
| # OFFSET: DW_AT_location (DW_OP_addrx 0x4, DW_OP_plus_uconst 0x4) |
| |
| ################################################################################ |
| ## File below was generated using: |
| ## |
| ## $ clang++ -g -O3 /tmp/file.cpp -shared -fuse-ld=lld -nostdlib \ |
| ## -target aarch64-linux-gnuabi -mllvm -global-merge-ignore-single-use \ |
| ## -o /tmp/file.so |
| ## |
| ## With /tmp/file.cpp as: |
| ## 1: int bss_global; |
| ## 2: int data_global = 2; |
| ## 3: |
| ## 4: const char* str = |
| ## 5: "12345678"; |
| ## 6: |
| ## 7: int* f() { |
| ## 8: static int function_global; |
| ## 9: return &function_global; |
| ## 10: } |
| ## 11: |
| ## 12: static int alpha; |
| ## 13: static int beta; |
| ## 14: int *f(bool b) { return beta ? &alpha : β } |
| ## 15: |
| ## |
| ## ... then, one can get the offsets using `nm`, like: |
| ## $ nm out.so | grep bss_global |
| ## 00000000000038fc B bss_global |
| ## |
| ## Note the use of the aarch64 target (with -nostdlib in order to allow linkage |
| ## without libraries for cross-compilation) as well as -O3 and |
| ## -global-merge-ignore-single-use. This is a specific combination that makes |
| ## the compiler emit the `alpha` global variable with a more complex |
| ## DW_AT_location than just a DW_OP_addr/DW_OP_addrx. In this instance, it |
| ## outputs a `DW_AT_location (DW_OP_addrx 0x4, DW_OP_plus_uconst 0x4)`. |
| ## |
| ## Ideally, this would be tested by invoking clang directly on a C source file, |
| ## but unfortunately there's no way to do that for LLVM tests. The other option |
| ## is to compile IR to an objfile, but llvm-symbolizer doesn't understand that |
| ## two symbols can have the same address in different sections. In the code |
| ## above, for example, we'd have bss_global at .bss+0x0, and data_global at |
| ## .data+0x0, and so the symbolizer would only print one of them. Hence, we have |
| ## the ugly dso-to-yaml blob below. |
| ## |
| ## For now, constant strings don't have a debuginfo entry, and so can't be |
| ## symbolized correctly. In future (if D123534 gets merged), this can be updated |
| ## to include a check that llvm-symbolizer can also symbolize constant strings, |
| ## like `str` above (basically that &"12345678" should be symbolizable) |
| ## to the specific line. Then, you can find the address of the constant string |
| ## from the relocation: |
| ## |
| ## $ nm out.so | grep str |
| ## 00000000000038c0 D str |
| ## $ llvm-objdump -R out.so | grep 38c0 |
| ## 00000000000038c0 R_X86_64_RELATIVE *ABS*+0x4f8 # <-- 0x4f8 |
| ################################################################################ |
| |
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| - '/tmp/file.cpp' |
| - _Z1fb |
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| - f |
| - data_global |
| - int |
| - '/usr/local/google/home/mitchp/llvm-build/opt' |
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| - str |
| - bool |
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| - _Z1fv |
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| ... |
