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llvm-project/llvm/test/CodeGen/AArch64/seh-finally.ll
Martin Storsjö 3780a4e568 [AArch64] Match the windows canonical callee saved register order 
On windows, the callee saved registers in a canonical prologue are
ordered starting from a lower register number at a lower stack
address (with the possible gap for aligning the stack at the top);
this is the opposite order that llvm normally produces.

To achieve this, reverse the order of the registers in the
assignCalleeSavedSpillSlots callback, to get the stack objects
laid out by PrologEpilogInserter in the right order, and adjust
computeCalleeSaveRegisterPairs to lay them out from the bottom up.

This allows generated prologs more often to match the format that
allows the unwind info to be written as packed info.

Differential Revision: https://reviews.llvm.org/D88677
2020-10-03 21:37:22 +03:00

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; RUN: llc -mtriple arm64-windows -o - %s | FileCheck %s
; struct S { int x; };
; void foo(int n);
; void foo(struct S o);
; void simple_seh() {
; struct S o;
;
; __try { foo(o.x); }
; __finally { foo(o.x); }
; }
; void stack_realign() {
; struct S __declspec(align(32)) o;
;
; __try { foo(o.x); }
; __finally { foo(o.x); }
; }
; void vla_present(int n) {
; int vla[n];
;
; __try { foo(n); }
; __finally { foo(n); }
; }
; void vla_and_realign(int n) {
; struct S __declspec(align(32)) o;
; int vla[n];
;
; __try { foo(o.x); }
; __finally { foo(o.x); }
; }
%struct.S = type { i32 }
; Test simple SEH (__try/__finally).
define void @simple_seh() #0 personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*) {
entry:
; CHECK-LABEL: simple_seh
; CHECK: add x29, sp, #16
; CHECK: mov x0, #-2
; CHECK: stur x0, [x29, #16]
; CHECK: .set .Lsimple_seh$frame_escape_0, -8
; CHECK: ldur w0, [x29, #-8]
; CHECK: bl foo
%o = alloca %struct.S, align 4
call void (...) @llvm.localescape(%struct.S* %o)
%x = getelementptr inbounds %struct.S, %struct.S* %o, i32 0, i32 0
%0 = load i32, i32* %x, align 4
invoke void @foo(i32 %0) #5
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%1 = call i8* @llvm.localaddress()
call void @fin_simple_seh(i8 0, i8* %1)
ret void
ehcleanup: ; preds = %entry
%2 = cleanuppad within none []
%3 = call i8* @llvm.localaddress()
call void @fin_simple_seh(i8 1, i8* %3) [ "funclet"(token %2) ]
cleanupret from %2 unwind to caller
}
define void @fin_simple_seh(i8 %abnormal_termination, i8* %frame_pointer) {
entry:
; CHECK-LABEL: fin_simple_seh
; CHECK: movz x8, #:abs_g1_s:.Lsimple_seh$frame_escape_0
; CHECK: movk x8, #:abs_g0_nc:.Lsimple_seh$frame_escape_0
; CHECK: strb w0, [sp, #15]
; CHECK: ldr w0, [x1, x8]
; CHECK: bl foo
%frame_pointer.addr = alloca i8*, align 8
%abnormal_termination.addr = alloca i8, align 1
%0 = call i8* @llvm.localrecover(i8* bitcast (void ()* @simple_seh to i8*), i8* %frame_pointer, i32 0)
%o = bitcast i8* %0 to %struct.S*
store i8* %frame_pointer, i8** %frame_pointer.addr, align 8
store i8 %abnormal_termination, i8* %abnormal_termination.addr, align 1
%x = getelementptr inbounds %struct.S, %struct.S* %o, i32 0, i32 0
%1 = load i32, i32* %x, align 4
call void @foo(i32 %1)
ret void
}
; Test SEH when stack realignment is needed in case highly aligned stack objects are present.
define void @stack_realign() #0 personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*) {
entry:
; CHECK-LABEL: stack_realign
; CHECK: add x29, sp, #8
; CHECK: sub x9, sp, #16
; CHECK: and sp, x9, #0xffffffffffffffe0
; CHECK: mov x19, sp
; CHECK: mov x0, #-2
; CHECK: stur x0, [x29, #24]
; CHECK: .set .Lstack_realign$frame_escape_0, 0
; CHECK: ldr w0, [x19]
; CHECK: bl foo
%o = alloca %struct.S, align 32
call void (...) @llvm.localescape(%struct.S* %o)
%x = getelementptr inbounds %struct.S, %struct.S* %o, i32 0, i32 0
%0 = load i32, i32* %x, align 32
invoke void @foo(i32 %0) #5
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%1 = call i8* @llvm.localaddress()
call void @fin_stack_realign(i8 0, i8* %1)
ret void
ehcleanup: ; preds = %entry
%2 = cleanuppad within none []
%3 = call i8* @llvm.localaddress()
call void @fin_stack_realign(i8 1, i8* %3) [ "funclet"(token %2) ]
cleanupret from %2 unwind to caller
}
define void @fin_stack_realign(i8 %abnormal_termination, i8* %frame_pointer) {
entry:
; CHECK-LABEL: fin_stack_realign
; CHECK: movz x8, #:abs_g1_s:.Lstack_realign$frame_escape_0
; CHECK: movk x8, #:abs_g0_nc:.Lstack_realign$frame_escape_0
; CHECK: strb w0, [sp, #15]
; CHECK: ldr w0, [x1, x8]
; CHECK: bl foo
%frame_pointer.addr = alloca i8*, align 8
%abnormal_termination.addr = alloca i8, align 1
%0 = call i8* @llvm.localrecover(i8* bitcast (void ()* @stack_realign to i8*), i8* %frame_pointer, i32 0)
%o = bitcast i8* %0 to %struct.S*
store i8* %frame_pointer, i8** %frame_pointer.addr, align 8
store i8 %abnormal_termination, i8* %abnormal_termination.addr, align 1
%x = getelementptr inbounds %struct.S, %struct.S* %o, i32 0, i32 0
%1 = load i32, i32* %x, align 32
call void @foo(i32 %1)
ret void
}
; Test SEH when variable size objects are present on the stack. Note: Escaped vla's are current not supported by SEH.
define void @vla_present(i32 %n) #0 personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*) {
entry:
; CHECK-LABEL: vla_present
; CHECK: add x29, sp, #32
; CHECK: mov x1, #-2
; CHECK: stur x1, [x29, #16]
; CHECK: .set .Lvla_present$frame_escape_0, -4
; CHECK: stur w0, [x29, #-4]
; CHECK: ldur w8, [x29, #-4]
; CHECK: mov x9, sp
; CHECK: stur x9, [x29, #-16]
; CHECK: stur x8, [x29, #-24]
; CHECK: ldur w0, [x29, #-4]
; CHECK: bl foo
%n.addr = alloca i32, align 4
%saved_stack = alloca i8*, align 8
%__vla_expr0 = alloca i64, align 8
call void (...) @llvm.localescape(i32* %n.addr)
store i32 %n, i32* %n.addr, align 4
%0 = load i32, i32* %n.addr, align 4
%1 = zext i32 %0 to i64
%2 = call i8* @llvm.stacksave()
store i8* %2, i8** %saved_stack, align 8
%vla = alloca i32, i64 %1, align 4
store i64 %1, i64* %__vla_expr0, align 8
%3 = load i32, i32* %n.addr, align 4
invoke void @foo(i32 %3) #5
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%4 = call i8* @llvm.localaddress()
call void @fin_vla_present(i8 0, i8* %4)
%5 = load i8*, i8** %saved_stack, align 8
call void @llvm.stackrestore(i8* %5)
ret void
ehcleanup: ; preds = %entry
%6 = cleanuppad within none []
%7 = call i8* @llvm.localaddress()
call void @fin_vla_present(i8 1, i8* %7) [ "funclet"(token %6) ]
cleanupret from %6 unwind to caller
}
define void @fin_vla_present(i8 %abnormal_termination, i8* %frame_pointer) {
entry:
; CHECK-LABEL: fin_vla_present
; CHECK: movz x8, #:abs_g1_s:.Lvla_present$frame_escape_0
; CHECK: movk x8, #:abs_g0_nc:.Lvla_present$frame_escape_0
; CHECK: strb w0, [sp, #15]
; CHECK: ldr w0, [x1, x8]
; CHECK: bl foo
%frame_pointer.addr = alloca i8*, align 8
%abnormal_termination.addr = alloca i8, align 1
%0 = call i8* @llvm.localrecover(i8* bitcast (void (i32)* @vla_present to i8*), i8* %frame_pointer, i32 0)
%n.addr = bitcast i8* %0 to i32*
store i8* %frame_pointer, i8** %frame_pointer.addr, align 8
store i8 %abnormal_termination, i8* %abnormal_termination.addr, align 1
%1 = load i32, i32* %n.addr, align 4
call void @foo(i32 %1)
ret void
}
; Test when both vla's and highly aligned objects are present on stack.
define void @vla_and_realign(i32 %n) #0 personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*) {
entry:
; CHECK-LABEL: vla_and_realign
; CHECK: add x29, sp, #8
; CHECK: sub x9, sp, #48
; CHECK: and sp, x9, #0xffffffffffffffe0
; CHECK: mov x19, sp
; CHECK: mov x1, #-2
; CHECK: stur x1, [x29, #24]
; CHECK: .set .Lvla_and_realign$frame_escape_0, 32
; CHECK: str w0, [x29, #36]
; CHECK: ldr w8, [x29, #36]
; CHECK: mov x9, sp
; CHECK: str x9, [x29, #16]
; CHECK: str x8, [x19, #24]
; CHECK: ldr w0, [x19, #32]
; CHECK: bl foo
%n.addr = alloca i32, align 4
%o = alloca %struct.S, align 32
%saved_stack = alloca i8*, align 8
%__vla_expr0 = alloca i64, align 8
call void (...) @llvm.localescape(%struct.S* %o)
store i32 %n, i32* %n.addr, align 4
%0 = load i32, i32* %n.addr, align 4
%1 = zext i32 %0 to i64
%2 = call i8* @llvm.stacksave()
store i8* %2, i8** %saved_stack, align 8
%vla = alloca i32, i64 %1, align 4
store i64 %1, i64* %__vla_expr0, align 8
%x = getelementptr inbounds %struct.S, %struct.S* %o, i32 0, i32 0
%3 = load i32, i32* %x, align 32
invoke void @foo(i32 %3) #5
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%4 = call i8* @llvm.localaddress()
call void @fin_vla_and_realign(i8 0, i8* %4)
%5 = load i8*, i8** %saved_stack, align 8
call void @llvm.stackrestore(i8* %5)
ret void
ehcleanup: ; preds = %entry
%6 = cleanuppad within none []
%7 = call i8* @llvm.localaddress()
call void @fin_vla_and_realign(i8 1, i8* %7) [ "funclet"(token %6) ]
cleanupret from %6 unwind to caller
}
define void @fin_vla_and_realign(i8 %abnormal_termination, i8* %frame_pointer) {
entry:
; CHECK-LABEL: fin_vla_and_realign
; CHECK: movz x8, #:abs_g1_s:.Lvla_and_realign$frame_escape_0
; CHECK: movk x8, #:abs_g0_nc:.Lvla_and_realign$frame_escape_0
; CHECK: strb w0, [sp, #15]
; CHECK: ldr w0, [x1, x8]
; CHECK: bl foo
%frame_pointer.addr = alloca i8*, align 8
%abnormal_termination.addr = alloca i8, align 1
%0 = call i8* @llvm.localrecover(i8* bitcast (void (i32)* @vla_and_realign to i8*), i8* %frame_pointer, i32 0)
%o = bitcast i8* %0 to %struct.S*
store i8* %frame_pointer, i8** %frame_pointer.addr, align 8
store i8 %abnormal_termination, i8* %abnormal_termination.addr, align 1
%x = getelementptr inbounds %struct.S, %struct.S* %o, i32 0, i32 0
%1 = load i32, i32* %x, align 32
call void @foo(i32 %1)
ret void
}
declare void @foo(i32)
declare void @llvm.stackrestore(i8*)
declare i8* @llvm.stacksave()
declare i8* @llvm.localrecover(i8*, i8*, i32)
declare i8* @llvm.localaddress()
declare void @llvm.localescape(...)
declare i32 @__C_specific_handler(...)
attributes #0 = { noinline optnone }
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