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bolt/deps/llvm-18.1.8/llvm/test/tools/llvm-symbolizer/data-location.yaml

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Embed LLVM 18.1.8
2025-02-14 19:21:04 +01:00
## 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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...
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