https://llvm.org/bugs/show_bug.cgi?id=28609
Bug ID: 28609
Summary: Crash in CodeGen when processing default switch
statement
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: rtrieu at google.com
CC: llvm-bugs at lists.llvm.org
Classification: Unclassified
$ cat small.c
void fn1() {
switch (0)
case 0:
do {
default:
;
} while (0)
;
}
$ clang small.c
1. <eof> parser at end of file
2. small.c:1:6: LLVM IR generation of declaration 'fn1'
3. small.c:1:6: Generating code for declaration 'fn1'
4. small.c:4:6: LLVM IR generation of compound statement ('{}')
Backtrace:
#3 clang::CodeGen::CodeGenFunction::EmitDefaultStmt(clang::DefaultStmt const&)
#4 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*)
#5 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*)
#6
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
#7 clang::CodeGen::CodeGenFunction::EmitCompoundStmt(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
#8 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*)
#9 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*)
It looks like Clang was attempting to run CodeGen on a default statement. But
when it attempted to find the related switch statement, it got a null pointer
instead and segfaulted. Located at #3, CGStmt.cpp:1264, SwitchInsn is null.
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