1; Test that safestack layout reuses a region w/o fragmentation. 2; RUN: opt -safe-stack -safe-stack-coloring=1 -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s 3 4define void @f() safestack { 5; CHECK-LABEL: define void @f 6entry: 7; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr 8; CHECK: getelementptr i8, i8* %[[USP]], i32 -16 9 10 %x0 = alloca i64, align 8 11 %x1 = alloca i8, align 1 12 %x2 = alloca i64, align 8 13 14 %x0a = bitcast i64* %x0 to i8* 15 %x2a = bitcast i64* %x2 to i8* 16 17 call void @llvm.lifetime.start.p0i8(i64 8, i8* %x0a) 18 call void @capture64(i64* %x0) 19 call void @llvm.lifetime.end.p0i8(i64 8, i8* %x0a) 20 21 call void @llvm.lifetime.start.p0i8(i64 1, i8* %x1) 22 call void @llvm.lifetime.start.p0i8(i64 8, i8* %x2a) 23 call void @capture8(i8* %x1) 24 call void @capture64(i64* %x2) 25 call void @llvm.lifetime.end.p0i8(i64 1, i8* %x1) 26 call void @llvm.lifetime.end.p0i8(i64 8, i8* %x2a) 27 28; Test that i64 allocas share space. 29; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 30; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -9 31; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 32 33 ret void 34} 35 36declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) 37declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) 38declare void @capture8(i8*) 39declare void @capture64(i64*) 40