Bug Summary

File:llvm/tools/llvm-objdump/WasmDump.cpp
Warning:line 27, column 20
Called C++ object pointer is null

Annotated Source Code

Press '?' to see keyboard shortcuts

clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name WasmDump.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/llvm-objdump -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/llvm/tools/llvm-objdump -I include -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm=build-llvm -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm=build-llvm -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm=build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-01-19-134126-35450-1 -x c++ /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/llvm/tools/llvm-objdump/WasmDump.cpp
1//===-- WasmDump.cpp - wasm-specific dumper ---------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This file implements the wasm-specific dumper for llvm-objdump.
11///
12//===----------------------------------------------------------------------===//
13
14#include "WasmDump.h"
15
16#include "llvm-objdump.h"
17#include "llvm/Object/Wasm.h"
18
19using namespace llvm;
20using namespace llvm::object;
21
22void objdump::printWasmFileHeader(const object::ObjectFile *Obj) {
23 const auto *File = dyn_cast<const WasmObjectFile>(Obj);
1
Assuming 'Obj' is not a 'WasmObjectFile'
→
2
←
'File' initialized to a null pointer value
→
24
25 outs() << "Program Header:\n";
26 outs() << "Version: 0x";
27 outs().write_hex(File->getHeader().Version);
3
←
Called C++ object pointer is null
28 outs() << "\n";
29}
30
31Error objdump::getWasmRelocationValueString(const WasmObjectFile *Obj,
32 const RelocationRef &RelRef,
33 SmallVectorImpl<char> &Result) {
34 const wasm::WasmRelocation &Rel = Obj->getWasmRelocation(RelRef);
35 symbol_iterator SI = RelRef.getSymbol();
36 std::string FmtBuf;
37 raw_string_ostream Fmt(FmtBuf);
38 if (SI == Obj->symbol_end()) {
39 // Not all wasm relocations have symbols associated with them.
40 // In particular R_WASM_TYPE_INDEX_LEB.
41 Fmt << Rel.Index;
42 } else {
43 Expected<StringRef> SymNameOrErr = SI->getName();
44 if (!SymNameOrErr)
45 return SymNameOrErr.takeError();
46 StringRef SymName = *SymNameOrErr;
47 Result.append(SymName.begin(), SymName.end());
48 }
49 Fmt << (Rel.Addend < 0 ? "" : "+") << Rel.Addend;
50 Fmt.flush();
51 Result.append(FmtBuf.begin(), FmtBuf.end());
52 return Error::success();
53}