## Test that verifies DW_AT_LLVM_stmt_sequence attributes are correctly
## patched in the dSYM. Each input object (a.o and b.o) carries one
## compile unit whose line table has two sequences (one per function).
## After linking, dsymutil merges each CU's two function sequences into a
## single output sequence (adjacent addresses). We verify that every
## DW_AT_LLVM_stmt_sequence attribute in the output points at a real
## DW_LNE_set_address opcode in the emitted .debug_line, for both the
## classic and parallel linker backends.

# RUN: rm -rf %t && split-file %s %t && cd %t
# RUN: yaml2obj %t/stmt_seq_macho.exe.yaml -o %t/stmt_seq_macho.exe
# RUN: yaml2obj %t/a.o.yaml -o %t/a.o
# RUN: yaml2obj %t/b.o.yaml -o %t/b.o
# RUN: dsymutil --linker classic --flat --verify-dwarf=none -oso-prepend-path %t %t/stmt_seq_macho.exe -o %t/stmt_seq_macho.dSYM
# RUN: llvm-dwarfdump --debug-info --debug-line -v %t/stmt_seq_macho.dSYM > %t/stmt_seq_macho.dSYM.txt

## Verify that all stmt_sequence offsets point to DW_LNE_set_address opcodes
## Extract unique stmt_sequence offsets and verify each appears as a set_address offset
# RUN: cat %t/stmt_seq_macho.dSYM.txt | grep "DW_AT_LLVM_stmt_sequence" | \
# RUN:   sed 's/.*(\(0x[0-9a-f]*\)).*/\1/' | sort -u > %t/stmt_offsets.txt
# RUN: cat %t/stmt_seq_macho.dSYM.txt | grep "DW_LNE_set_address" | \
# RUN:   sed 's/^\(0x[0-9a-f]*\):.*/\1/' | sort -u > %t/setaddr_offsets.txt
# RUN: comm -23 %t/stmt_offsets.txt %t/setaddr_offsets.txt > %t/bad_offsets.txt
# RUN: test ! -s %t/bad_offsets.txt

## Ensure no sentinel/invalid offsets (0xffffffff indicates broken patching)
# RUN: cat %t/stmt_seq_macho.dSYM.txt | FileCheck %s -check-prefix=CHECK_NO_INVALID_OFFSET
# CHECK_NO_INVALID_OFFSET-NOT: DW_AT_LLVM_stmt_sequence{{.*}}0xfffffff

# RUN: dsymutil --linker parallel --flat --verify-dwarf=none -oso-prepend-path %t %t/stmt_seq_macho.exe -o %t/stmt_seq_macho.dSYM
# RUN: llvm-dwarfdump --debug-info --debug-line -v %t/stmt_seq_macho.dSYM > %t/stmt_seq_macho.dSYM.txt
# RUN: cat %t/stmt_seq_macho.dSYM.txt | grep "DW_AT_LLVM_stmt_sequence" | \
# RUN:   sed 's/.*(\(0x[0-9a-f]*\)).*/\1/' | sort -u > %t/stmt_offsets.txt
# RUN: cat %t/stmt_seq_macho.dSYM.txt | grep "DW_LNE_set_address" | \
# RUN:   sed 's/^\(0x[0-9a-f]*\):.*/\1/' | sort -u > %t/setaddr_offsets.txt
# RUN: comm -23 %t/stmt_offsets.txt %t/setaddr_offsets.txt > %t/bad_offsets.txt
# RUN: test ! -s %t/bad_offsets.txt
# RUN: cat %t/stmt_seq_macho.dSYM.txt | FileCheck %s -check-prefix=CHECK_NO_INVALID_OFFSET

#--- stmt_seq_macho.cpp
// This file is split into a.cpp and b.cpp by the gen script.
// The functions are compiled into separate object files and linked
// with b.o first, so function_b gets a lower address than function_a.
// This triggers reordering in dsymutil's line table processing.

#--- a.cpp
// Functions in a.o - will have HIGHER addresses in the final executable
#define ATTRIB extern "C" __attribute__((noinline))

ATTRIB int function_a1(int a) {
    int b = a + 1;
    return b * 2;
}

ATTRIB int function_a2(int a) {
    int b = a + 3;
    return b + 1;
}

#--- b.cpp
// Functions in b.o - will have LOWER addresses in the final executable
#define ATTRIB extern "C" __attribute__((noinline))

ATTRIB int function_b1(int a) {
    int b = a - 1;
    return b * 3;
}

ATTRIB int function_b2(int a) {
    int b = a - 5;
    return b + 2;
}

#--- main.cpp
extern "C" int function_a1(int);
extern "C" int function_a2(int);
extern "C" int function_b1(int);
extern "C" int function_b2(int);

int main() {
    int sum = 0;
    sum += function_a1(1);
    sum += function_a2(2);
    sum += function_b1(3);
    sum += function_b2(4);
    return sum;
}

#--- gen
# Compile to separate object files with stmt_sequence attributes
clang --target=arm64-apple-macos11 \
  -c \
  -fdebug-compilation-dir=/private/tmp/stmt_seq \
  -g \
  -gdwarf-4 \
  -fno-unwind-tables \
  -mllvm -emit-func-debug-line-table-offsets \
  -fno-exceptions \
  -mno-outline \
  -Oz \
  a.cpp \
  -o a.o

clang --target=arm64-apple-macos11 \
  -c \
  -fdebug-compilation-dir=/private/tmp/stmt_seq \
  -g \
  -gdwarf-4 \
  -fno-unwind-tables \
  -mllvm -emit-func-debug-line-table-offsets \
  -fno-exceptions \
  -mno-outline \
  -Oz \
  b.cpp \
  -o b.o

clang --target=arm64-apple-macos11 \
  -c \
  -fdebug-compilation-dir=/private/tmp/stmt_seq \
  -g \
  -gdwarf-4 \
  -fno-unwind-tables \
  -fno-exceptions \
  -mno-outline \
  -Oz \
  main.cpp \
  -o main.o

# Link with b.o FIRST so b's functions get LOWER addresses than a's functions.
# This means when dsymutil processes a.o, its line table sequences will need
# to be placed AFTER b.o's sequences in the output, triggering reordering.
ld64.lld \
  -arch arm64 \
  -platform_version macos 11.0.0 11.0.0 \
  -o stmt_seq_macho.exe \
  b.o a.o main.o \
  -oso_prefix $(pwd)/

# Convert to YAML for the test
echo "#--- a.o.yaml"
obj2yaml a.o | sed '1a\
IsLittleEndian: true'
echo ""
echo "#--- b.o.yaml"
obj2yaml b.o | sed '1a\
IsLittleEndian: true'
echo ""
echo "#--- stmt_seq_macho.exe.yaml"
obj2yaml stmt_seq_macho.exe | sed '1a\
IsLittleEndian: true'

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      n_sect:          1
      n_desc:          0
      n_value:         4294967988
    - n_strx:          47
      n_type:          0xF
      n_sect:          1
      n_desc:          0
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    - n_strx:          60
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  StringTable:
    - ' '
    - _main
    - _function_b1
    - _function_b2
    - _function_a1
    - _function_a2
    - __mh_execute_header
    - '/private/tmp/stmt_seq/b.cpp'
    - b.o
    - '/private/tmp/stmt_seq/a.cpp'
    - a.o
    - '/private/tmp/stmt_seq/main.cpp'
    - main.o
    - ''
    - ''
  FunctionStarts:  [ 0x2A0, 0x2AC, 0x2B4, 0x2C0, 0x2C8 ]
...