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Auto merge of #27960 - dotdash:zerosize_lifetime, r=alexcrichton

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These aren't super common, but happen for e.g. closures that have an
empty environment, and for for-loops that return ().
This commit is contained in:
bors 2015-08-23 17:23:23 +00:00
commit 9f227ca2c2
1 changed files with 12 additions and 4 deletions
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16
src/librustc_trans/trans/base.rs
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@ -917,10 +917,14 @@ pub fn call_lifetime_start(cx: Block, ptr: ValueRef) {
let _icx = push_ctxt("lifetime_start");
let ccx = cx.ccx();
let llsize = C_u64(ccx, machine::llsize_of_alloc(ccx, val_ty(ptr).element_type()));
let size = machine::llsize_of_alloc(ccx, val_ty(ptr).element_type());
if size == 0 {
return;
}
let ptr = PointerCast(cx, ptr, Type::i8p(ccx));
let lifetime_start = ccx.get_intrinsic(&"llvm.lifetime.start");
Call(cx, lifetime_start, &[llsize, ptr], None, DebugLoc::None);
Call(cx, lifetime_start, &[C_u64(ccx, size), ptr], None, DebugLoc::None);
}
pub fn call_lifetime_end(cx: Block, ptr: ValueRef) {
@ -931,10 +935,14 @@ pub fn call_lifetime_end(cx: Block, ptr: ValueRef) {
let _icx = push_ctxt("lifetime_end");
let ccx = cx.ccx();
let llsize = C_u64(ccx, machine::llsize_of_alloc(ccx, val_ty(ptr).element_type()));
let size = machine::llsize_of_alloc(ccx, val_ty(ptr).element_type());
if size == 0 {
return;
}
let ptr = PointerCast(cx, ptr, Type::i8p(ccx));
let lifetime_end = ccx.get_intrinsic(&"llvm.lifetime.end");
Call(cx, lifetime_end, &[llsize, ptr], None, DebugLoc::None);
Call(cx, lifetime_end, &[C_u64(ccx, size), ptr], None, DebugLoc::None);
}
pub fn call_memcpy(cx: Block, dst: ValueRef, src: ValueRef, n_bytes: ValueRef, align: u32) {