replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

After much consultation aimed at figuring out what this builtin actually 

does, document the results and then implement __builtin_extend_pointer for
platforms where it's a no-op.

llvm-svn: 97540
This commit is contained in:
John McCall 2010-03-02 02:31:24 +00:00
parent b884fe867e
commit 4b613fae35
2 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
clang/include/clang/Basic/Builtins.def
View File

@ -317,7 +317,7 @@ BUILTIN(__builtin_frob_return_addr, "v*v*", "n")
BUILTIN(__builtin_dwarf_cfa, "v*", "n")
BUILTIN(__builtin_init_dwarf_reg_size_table, "vv*", "n")
BUILTIN(__builtin_dwarf_sp_column, "Ui", "n")
BUILTIN(__builtin_extend_pointer, "iv*", "n")
BUILTIN(__builtin_extend_pointer, "zv*", "n") // Really _Unwind_Ptr -> _Unwind_Word
// GCC Object size checking builtins
BUILTIN(__builtin_object_size, "zv*i", "n")

16
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -365,6 +365,22 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
Value *F = CGM.getIntrinsic(Intrinsic::eh_unwind_init, 0, 0);
return RValue::get(Builder.CreateCall(F));
}
case Builtin::BI__builtin_extend_pointer: {
// Extends a pointer to the size of an _Unwind_Word, which is
// generally a uint64_t. Generally this gets poked directly into
// a register (or a "register" depending on platform) and then
// called, so if the pointer is shorter than a word we need to
// zext / sext based on the platform's expectations for pointers
// in registers.
//
// See: http://gcc.gnu.org/ml/gcc-bugs/2002-02/msg00237.html
//
// FIXME: ptrtoint always zexts; use a target hook if we start
// supporting targets where this matters.
Value *Ptr = EmitScalarExpr(E->getArg(0));
const llvm::Type *Ty = CGM.getTypes().ConvertType(E->getType());
return RValue::get(Builder.CreatePtrToInt(Ptr, Ty));
}
#if 0
// FIXME: Finish/enable when LLVM backend support stabilizes
case Builtin::BI__builtin_setjmp: {