## 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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