On Dec 16, 2007, at 7:04 AM, Steve Naroff wrote:
fyi...clang's initializer support is still incomplete (e.g. we still
don't support structures). Back in September, I added some basic
support that implements ~85% of the C99 spec. Since then, Anders and
I made some tweaks for supporting "basic" character arrays (which
doesn't correctly handle the case below).
I hope to finish initializer support after the holidays.
In the meantime, enough people are hitting the codegen assertion that
I added a hack to the code generator to warn about it and carry on.
You'll get invalid code, but at least you won't get crashes all over
the place:
t3.c:1:24: warning: cannot codegen this initializer yet
const char x[2][4] = { { 'a', 'b', '\0', '\0' }, { 'c', 'd', 'e',
'\0' } };
^~~~~~~~~~~~~~~~~~~~~~~~
-Chris
snaroff
On Dec 16, 2007, at 6:04 AM, Shantonu Sen wrote:
The following source fails to parse:
$ cat a.c
const char w[4] = "ab";
const char x[2][4] = { { 'a', 'b', '\0', '\0' }, { 'c', 'd', 'e',
'\0' } };
const char y[2][4] = { "ab", "cde" };
const char y2[2][4] = { { "ab" }, { "cde" } };
const char * const z[2] = { "ab", "cde" };
]$ clang -std=c99 a.c -fsyntax-only
a.c:3:30: error: excess elements in char array initializer
const char y[2][4] = { "ab", "cde" };
^~~~~
1 diagnostic generated.
$
This appears to be C99 6.7.8.14:
14 An array of character type may be initialized by a character
string literal, optionally
enclosed in braces. Successive characters of the character string
literal (including the
terminating null character if there is room or if the array is of
unknown size) initialize the
elements of the array.
Additionally, even when compiling just "x", -emit-llvm fails:
$ cat b.c
const char x[2][4] = { { 'a', 'b', '\0', '\0' }, { 'c', 'd', 'e',
'\0' } };
$ clang -std=c99 b.c -ast-dump
typedef char *__builtin_va_list;
Read top-level variable decl: 'x'
$ clang -std=c99 b.c -emit-llvm 2>&1 | c++filt -n
Assertion failed: (ILE->getType()->isArrayType() || ILE->getType()-
>isStructureType()), function GenerateAggregateInit, file
CodeGenModule.cpp, line 284.
0 clang 0x0021b8cb (anonymous
namespace)::PrintStackTrace() + 45
1 clang 0x0021bc71 (anonymous
namespace)::SignalHandler(int) + 323
2 libSystem.B.dylib 0x9188897b _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
4 libSystem.B.dylib 0x91901782 raise + 26
5 libSystem.B.dylib 0x91910d3f abort + 73
6 libSystem.B.dylib 0x91902923 __assert_rtn + 101
7 clang 0x0005d9a1
clang
::CodeGen
::CodeGenModule::GetAddrOfConstantCFString(std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) + 1577
8 clang 0x0005e4ce
clang
::CodeGen
::CodeGenModule::GetAddrOfConstantCFString(std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) + 4438
9 clang 0x0005dae3
clang
::CodeGen
::CodeGenModule::GetAddrOfConstantCFString(std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) + 1899
10 clang 0x0005e4ce
clang
::CodeGen
::CodeGenModule::GetAddrOfConstantCFString(std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) + 4438
11 clang 0x0005e53e
clang::CodeGen::CodeGenModule::EmitGlobalInit(clang::Expr const*) +
24
12 clang 0x0005e6d6
clang::CodeGen::CodeGenModule::EmitGlobalVar(clang::FileVarDecl
const*) + 406
13 clang 0x0005e7e6
clang
::CodeGen
::CodeGenModule::EmitGlobalVarDeclarator(clang::FileVarDecl const*)
+ 26
14 clang 0x00067ddc
clang::CodeGen::CodeGenGlobalVar(clang::CodeGen::CodeGenModule*,
clang::FileVarDecl*) + 24
15 clang 0x00006229 (anonymous
namespace)::LLVMEmitter::HandleTopLevelDecl(clang::Decl*) + 119
16 clang 0x0007af58
clang::ParseAST(clang::Preprocessor&, unsigned int,
clang::ASTConsumer*, bool) + 258
17 clang 0x000222c2
llvm::BitstreamWriter::Emit(unsigned int, unsigned int) + 3740
18 clang 0x0002444e main + 1370
19 clang 0x00001cca start + 54
Shantonu Sen
[EMAIL PROTECTED]
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