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stdlib: Implement casts. The horror.

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This commit is contained in:
Patrick Walton 2011-07-09 20:14:20 -07:00
parent 75047ea87e
commit e823ca4965
2 changed files with 46 additions and 0 deletions
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18
src/rt/intrinsics/intrinsics.cpp
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@ -2,6 +2,11 @@
// -I../arch/i386 -fno-stack-protector -o intrinsics.ll intrinsics.cpp`
#include "../rust_internal.h"
#include <cstdlib>
#include <cstring>
extern "C" CDECL void
upcall_fail(rust_task *task, char const *expr, char const *file, size_t line);
extern "C" size_t
rust_intrinsic_vec_len(rust_task *task, type_desc *ty, rust_vec *v)
@ -29,3 +34,16 @@ rust_intrinsic_ptr_offset(rust_task *task, type_desc *ty, void *ptr,
return &((uint8_t *)ptr)[ty->size * count];
}
extern "C" void
rust_intrinsic_cast(rust_task *task, type_desc *t1, type_desc *t2, void *dest,
void *src)
{
if (t1->size != t2->size) {
upcall_fail(task, "attempt to cast values of differing sizes",
__FILE__, __LINE__);
return;
}
memmove(dest, src, t1->size);
}

28
src/rt/intrinsics/intrinsics.ll.in
View file

@ -61,6 +61,9 @@ target triple = "@CFG_LLVM_TRIPLE@"
%struct.type_desc = type { %struct.type_desc**, i32, i32, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, i32, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*, i8*, i8)*, %struct.UT_hash_handle, i32, [0 x %struct.type_desc*] }
%union.rust_ivec_payload = type { %struct.rust_ivec_heap* }
@.str = private unnamed_addr constant [42 x i8] c"attempt to cast values of differing sizes\00", align 1
@.str1 = private unnamed_addr constant [15 x i8] c"intrinsics.cpp\00", align 1
define linkonce_odr i32 @rust_intrinsic_vec_len(%struct.rust_task* nocapture %task, %struct.type_desc* nocapture %ty, %struct.rust_vec* nocapture %v) nounwind readonly {
entry:
%fill = getelementptr inbounds %struct.rust_vec* %v, i32 0, i32 2
@ -106,6 +109,31 @@ entry:
ret i8* %arrayidx
}
define linkonce_odr void @rust_intrinsic_cast(%struct.rust_task* %task, %struct.type_desc* nocapture %t1, %struct.type_desc* nocapture %t2, i8* nocapture %dest, i8* nocapture %src) {
entry:
%size = getelementptr inbounds %struct.type_desc* %t1, i32 0, i32 1
%tmp1 = load i32* %size, align 4, !tbaa !0
%size3 = getelementptr inbounds %struct.type_desc* %t2, i32 0, i32 1
%tmp4 = load i32* %size3, align 4, !tbaa !0
%cmp = icmp eq i32 %tmp1, %tmp4
br i1 %cmp, label %if.end, label %if.then
if.then: ; preds = %entry
tail call void @upcall_fail(%struct.rust_task* %task, i8* getelementptr inbounds ([42 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([15 x i8]* @.str1, i32 0, i32 0), i32 43)
br label %return
if.end: ; preds = %entry
tail call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 %tmp1, i32 1, i1 false)
br label %return
return: ; preds = %if.end, %if.then
ret void
}
declare void @upcall_fail(%struct.rust_task*, i8*, i8*, i32)
declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
!0 = metadata !{metadata !"long", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA", null}