61e36e87df
Current stack size diagnostics ignore the size of the unsafe stack. This patch attaches the size of the static portion of the unsafe stack to the function as metadata, which can be used by the backend to emit diagnostics regarding stack usage. Reviewed By: phosek, mcgrathr Differential Revision: https://reviews.llvm.org/D119996
38 lines
1.4 KiB
LLVM
38 lines
1.4 KiB
LLVM
; RUN: llc -mtriple x86_64-apple-macosx10.8.0 < %s 2>&1 >/dev/null | FileCheck %s
|
|
; Check the internal option that warns when the stack frame size exceeds the
|
|
; given amount.
|
|
; <rdar://13987214>
|
|
|
|
; CHECK-NOT: nowarn
|
|
define void @nowarn() nounwind ssp "warn-stack-size"="80" {
|
|
entry:
|
|
%buffer = alloca [12 x i8], align 1
|
|
%arraydecay = getelementptr inbounds [12 x i8], [12 x i8]* %buffer, i64 0, i64 0
|
|
call void @doit(i8* %arraydecay) nounwind
|
|
ret void
|
|
}
|
|
|
|
; CHECK: warning: stack frame size (88) exceeds limit (80) in function 'warn'
|
|
define void @warn() nounwind ssp "warn-stack-size"="80" {
|
|
entry:
|
|
%buffer = alloca [80 x i8], align 1
|
|
%arraydecay = getelementptr inbounds [80 x i8], [80 x i8]* %buffer, i64 0, i64 0
|
|
call void @doit(i8* %arraydecay) nounwind
|
|
ret void
|
|
}
|
|
|
|
; Ensure that warn-stack-size also considers the size of the unsafe stack.
|
|
; With safestack enabled the machine stack size is well below 80, but the
|
|
; combined stack size of the machine stack and unsafe stack will exceed the
|
|
; warning threshold
|
|
|
|
; CHECK: warning: stack frame size (120) exceeds limit (80) in function 'warn_safestack'
|
|
define void @warn_safestack() nounwind ssp safestack "warn-stack-size"="80" {
|
|
entry:
|
|
%buffer = alloca [80 x i8], align 1
|
|
%arraydecay = getelementptr inbounds [80 x i8], [80 x i8]* %buffer, i64 0, i64 0
|
|
call void @doit(i8* %arraydecay) nounwind
|
|
ret void
|
|
}
|
|
declare void @doit(i8*)
|