[llvm-bugs] [Bug 40286] New: Typo + missing function parameters = crash

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40286

            Bug ID: 40286
           Summary: Typo + missing function parameters = crash
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Keywords: crash-on-invalid
          Severity: release blocker
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: husseydevin at gmail.com
                CC: husseydevin at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 21312
  --> https://bugs.llvm.org/attachment.cgi?id=21312&action=edit
crash dump

When a function call has both a missing parameter and a typo in one of the
parameters that Clang recognizes, Clang trunk (r350783 - r350877 at least)
crashes. Clang 7.0 is not affected.

This isn't a platform-specific issue, it currently occurs on the Linux-based
Compiler Explorer as seen here: https://godbolt.org/z/ngCmP_

Arguments:
clang -fsyntax-only test5.c

int foo(int x, int y);
int bar(int value) {
    return foo(valie);
}

Notice the typo in "valie" and the missing parameter. 

----

Preprocessed source isn't really necessary, but here it is:

# 1 "<built-in>"
# 1 "/Users/user/test5.c"
int foo(int x, int y);
int bar(int value) {
    return foo(valie);
}

----

shell script:

# Crash reproducer for clang version 8.0.0 (trunk 350877)
# Driver args: "-fsyntax-only" "/Users/user/test5.c"
# Original command:  "/Users/user/llvm/llvm/build/bin/clang-8" "-cc1" "-triple"
"x86_64-apple-macosx10.14.0" "-Wdeprecated-objc-isa-usage"
"-Werror=deprecated-objc-isa-usage" "-fsyntax-only" "-disable-free"
"-main-file-name" "test5.c" "-mrelocation-model" "pic" "-pic-level" "2"
"-mthread-model" "posix" "-mdisable-fp-elim" "-masm-verbose" "-munwind-tables"
"-target-cpu" "penryn" "-dwarf-column-info" "-debugger-tuning=lldb"
"-ggnu-pubnames" "-target-linker-version" "409.12" "-resource-dir"
"/Users/user/llvm/llvm/build/lib/clang/8.0.0"
"-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include"
"-I/usr/local/include" "-fdebug-compilation-dir" "/Users/user/llvm/llvm/build"
"-ferror-limit" "19" "-fmessage-length" "238" "-stack-protector" "1" "-fblocks"
"-fencode-extended-block-signature" "-fregister-global-dtors-with-atexit"
"-fobjc-runtime=macosx-10.14.0" "-fmax-type-align=16"
"-fdiagnostics-show-option" "-fcolor-diagnostics" "-x" "c"
"/Users/user/test5.c"
 "/Users/user/llvm/llvm/build/bin/clang-8" "-cc1" "-triple"
"x86_64-apple-macosx10.14.0" "-Wdeprecated-objc-isa-usage"
"-Werror=deprecated-objc-isa-usage" "-fsyntax-only" "-disable-free"
"-main-file-name" "test5.c" "-mrelocation-model" "pic" "-pic-level" "2"
"-mthread-model" "posix" "-mdisable-fp-elim" "-masm-verbose" "-munwind-tables"
"-target-cpu" "penryn" "-dwarf-column-info" "-debugger-tuning=lldb"
"-ggnu-pubnames" "-target-linker-version" "409.12" "-ferror-limit" "19"
"-fmessage-length" "238" "-stack-protector" "1" "-fblocks"
"-fencode-extended-block-signature" "-fregister-global-dtors-with-atexit"
"-fobjc-runtime=macosx-10.14.0" "-fmax-type-align=16"
"-fdiagnostics-show-option" "-fcolor-diagnostics" "-x" "c" "test5-49dc52.c"

------

Crash dump is attached.

------

macOS 10.14.2 (Mojave Patcher)
MacBook Pro (15-inch, Early 2011) / MacBookPro8,2
Intel Core i7 (2nd Generation/Sandy Bridge) @ 4 cores, 2.0 GHz
8 GB RAM
LLVM and Clang built from source, CMAKE_C{XX}_FLAGS="-O0 -g",
CMAKE_BUILD_TYPE="Debug", LLVM_TARGETS_TO_BUILD="X86;ARM"
Compiled with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

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