addr2line.py: Fix issue of applying offset in call stacks information (#3194)

The offset value is based on the start of the wasm file, it also equals to
the value of `wasm-objdump -d <wasm_file>`.

Author: lum1n0us

test-tools/addr2line/addr2line.py

@@ -31,10 +31,9 @@
 - run the following command to transfer the address to line info:
   ```
   $ cd test-tools/addr2line
-  $ python3 addr2line.py --wasi-sdk <wasi-sdk installation> --wabt <wabt installation> --wasm-file <wasm file path> call_stack.txt
+  $ python3 addr2line.py --wasi-sdk <wasi-sdk installation> --wasm-file <wasm file path> call_stack.txt
   ```
-- the script will use *wasm-objdump* in wabt to transform address, then use *llvm-dwarfdump* to lookup the line info for each address
-  in the call-stack dump.
+- the script will use *llvm-dwarfdump* to lookup the line info for each address in the call-stack dump.
 - the output will be:
   ```
   #00: 0x0a04 - $f18
@@ -46,42 +45,6 @@
 """
 
 
-def get_code_section_start(wasm_objdump: Path, wasm_file: Path) -> int:
-    """
-    Find the start offset of Code section in a wasm file.
-
-    if the code section header likes:
-      Code start=0x0000017c end=0x00004382 (size=0x00004206) count: 47
-
-    the start offset is 0x0000017c
-    """
-    cmd = f"{wasm_objdump} -h {wasm_file}"
-    p = subprocess.run(
-        shlex.split(cmd),
-        check=True,
-        capture_output=True,
-        text=True,
-        universal_newlines=True,
-    )
-    outputs = p.stdout.split(os.linesep)
-
-    # if there is no .debug section, return -1
-    for line in outputs:
-        line = line.strip()
-        if ".debug_info" in line:
-            break
-    else:
-        print(f"No .debug_info section found {wasm_file}")
-        return -1
-
-    for line in outputs:
-        line = line.strip()
-        if "Code" in line:
-            return int(line.split()[1].split("=")[1], 16)
-
-    return -1
-
-
 def get_line_info(dwarf_dump: Path, wasm_file: Path, offset: int) -> str:
     """
     Find the location info of a given offset in a wasm file.
@@ -142,21 +105,13 @@ def parse_call_stack_line(line: str) -> ():
 def main():
     parser = argparse.ArgumentParser(description="addr2line for wasm")
     parser.add_argument("--wasi-sdk", type=Path, help="path to wasi-sdk")
-    parser.add_argument("--wabt", type=Path, help="path to wabt")
     parser.add_argument("--wasm-file", type=Path, help="path to wasm file")
     parser.add_argument("call_stack_file", type=Path, help="path to a call stack file")
     args = parser.parse_args()
 
-    wasm_objdump = args.wabt.joinpath("bin/wasm-objdump")
-    assert wasm_objdump.exists()
-
     llvm_dwarf_dump = args.wasi_sdk.joinpath("bin/llvm-dwarfdump")
     assert llvm_dwarf_dump.exists()
 
-    code_section_start = get_code_section_start(wasm_objdump, args.wasm_file)
-    if code_section_start == -1:
-        return -1
-
     assert args.call_stack_file.exists()
     with open(args.call_stack_file, "rt", encoding="ascii") as f:
         for line in f:
@@ -173,7 +128,6 @@ def main():
             _, offset, _ = splitted
 
             offset = int(offset, 16)
-            offset = offset - code_section_start
             line_info = get_line_info(llvm_dwarf_dump, args.wasm_file, offset)
             if not line_info:
                 print(line)