171 lines
5.3 KiB
LLVM
171 lines
5.3 KiB
LLVM
; RUN: llc -mtriple x86_64-pc-windows-msvc < %s | FileCheck %s
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; This test case is also intended to be run manually as a complete functional
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; test. It should link, print something, and exit zero rather than crashing.
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; It is the hypothetical lowering of a C source program that looks like:
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;
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; int safe_div(int *n, int *d) {
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; int r;
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; __try {
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; __try {
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; r = *n / *d;
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; } __except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION) {
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; puts("EXCEPTION_ACCESS_VIOLATION");
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; r = -1;
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; }
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; } __except(GetExceptionCode() == EXCEPTION_INT_DIVIDE_BY_ZERO) {
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; puts("EXCEPTION_INT_DIVIDE_BY_ZERO");
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; r = -2;
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; }
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; return r;
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; }
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@str1 = internal constant [27 x i8] c"EXCEPTION_ACCESS_VIOLATION\00"
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@str2 = internal constant [29 x i8] c"EXCEPTION_INT_DIVIDE_BY_ZERO\00"
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define i32 @safe_div(i32* %n, i32* %d) personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*) {
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entry:
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%r = alloca i32, align 4
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invoke void @try_body(i32* %r, i32* %n, i32* %d)
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to label %__try.cont unwind label %lpad0
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lpad0:
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%cs0 = catchswitch within none [label %handler0] unwind label %lpad1
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handler0:
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%p0 = catchpad within %cs0 [i8* bitcast (i32 (i8*, i8*)* @safe_div_filt0 to i8*)]
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call void @puts(i8* getelementptr ([27 x i8], [27 x i8]* @str1, i32 0, i32 0)) [ "funclet"(token %p0) ]
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store i32 -1, i32* %r, align 4
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catchret from %p0 to label %__try.cont
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lpad1:
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%cs1 = catchswitch within none [label %handler1] unwind to caller
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handler1:
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%p1 = catchpad within %cs1 [i8* bitcast (i32 (i8*, i8*)* @safe_div_filt1 to i8*)]
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call void @puts(i8* getelementptr ([29 x i8], [29 x i8]* @str2, i32 0, i32 0)) [ "funclet"(token %p1) ]
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store i32 -2, i32* %r, align 4
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catchret from %p1 to label %__try.cont
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__try.cont:
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%safe_ret = load i32, i32* %r, align 4
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ret i32 %safe_ret
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}
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; Normal path code
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; CHECK: {{^}}safe_div:
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; CHECK: .seh_proc safe_div
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; CHECK: .seh_handler __C_specific_handler, @unwind, @except
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; CHECK: .Ltmp0:
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; CHECK: leaq [[rloc:.*\(%rbp\)]], %rcx
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; CHECK: callq try_body
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; CHECK-NEXT: .Ltmp1
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; CHECK: [[cont_bb:\.LBB0_[0-9]+]]:
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; CHECK: movl [[rloc]], %eax
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; CHECK: retq
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; Landing pad code
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; CHECK: [[handler1:\.LBB0_[0-9]+]]: # %handler1
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; CHECK: callq puts
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; CHECK: movl $-2, [[rloc]]
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; CHECK: jmp [[cont_bb]]
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; CHECK: [[handler0:\.LBB0_[0-9]+]]: # %handler0
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; CHECK: callq puts
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; CHECK: movl $-1, [[rloc]]
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; CHECK: jmp [[cont_bb]]
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; CHECK: .seh_handlerdata
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; CHECK-NEXT: .Lsafe_div$parent_frame_offset
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; CHECK-NEXT: .long (.Llsda_end0-.Llsda_begin0)/16
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; CHECK-NEXT: .Llsda_begin0:
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; CHECK-NEXT: .long .Ltmp0@IMGREL+1
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; CHECK-NEXT: .long .Ltmp1@IMGREL+1
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; CHECK-NEXT: .long safe_div_filt0@IMGREL
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; CHECK-NEXT: .long [[handler0]]@IMGREL
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; CHECK-NEXT: .long .Ltmp0@IMGREL+1
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; CHECK-NEXT: .long .Ltmp1@IMGREL+1
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; CHECK-NEXT: .long safe_div_filt1@IMGREL
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; CHECK-NEXT: .long [[handler1]]@IMGREL
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; CHECK-NEXT: .Llsda_end0:
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; CHECK: .text
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; CHECK: .seh_endproc
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define void @try_body(i32* %r, i32* %n, i32* %d) {
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entry:
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%0 = load i32, i32* %n, align 4
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%1 = load i32, i32* %d, align 4
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%div = sdiv i32 %0, %1
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store i32 %div, i32* %r, align 4
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ret void
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}
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; The prototype of these filter functions is:
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; int filter(EXCEPTION_POINTERS *eh_ptrs, void *rbp);
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; The definition of EXCEPTION_POINTERS is:
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; typedef struct _EXCEPTION_POINTERS {
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; EXCEPTION_RECORD *ExceptionRecord;
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; CONTEXT *ContextRecord;
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; } EXCEPTION_POINTERS;
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; The definition of EXCEPTION_RECORD is:
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; typedef struct _EXCEPTION_RECORD {
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; DWORD ExceptionCode;
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; ...
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; } EXCEPTION_RECORD;
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; The exception code can be retreived with two loads, one for the record
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; pointer and one for the code. The values of local variables can be
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; accessed via rbp, but that would require additional not yet implemented LLVM
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; support.
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define i32 @safe_div_filt0(i8* %eh_ptrs, i8* %rbp) {
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%eh_ptrs_c = bitcast i8* %eh_ptrs to i32**
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%eh_rec = load i32*, i32** %eh_ptrs_c
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%eh_code = load i32, i32* %eh_rec
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; EXCEPTION_ACCESS_VIOLATION = 0xC0000005
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%cmp = icmp eq i32 %eh_code, 3221225477
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%filt.res = zext i1 %cmp to i32
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ret i32 %filt.res
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}
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define i32 @safe_div_filt1(i8* %eh_ptrs, i8* %rbp) {
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%eh_ptrs_c = bitcast i8* %eh_ptrs to i32**
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%eh_rec = load i32*, i32** %eh_ptrs_c
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%eh_code = load i32, i32* %eh_rec
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; EXCEPTION_INT_DIVIDE_BY_ZERO = 0xC0000094
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%cmp = icmp eq i32 %eh_code, 3221225620
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%filt.res = zext i1 %cmp to i32
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ret i32 %filt.res
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}
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@str_result = internal constant [21 x i8] c"safe_div result: %d\0A\00"
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define i32 @main() {
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%d.addr = alloca i32, align 4
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%n.addr = alloca i32, align 4
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store i32 10, i32* %n.addr, align 4
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store i32 2, i32* %d.addr, align 4
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%r1 = call i32 @safe_div(i32* %n.addr, i32* %d.addr)
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call void (i8*, ...) @printf(i8* getelementptr ([21 x i8], [21 x i8]* @str_result, i32 0, i32 0), i32 %r1)
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store i32 10, i32* %n.addr, align 4
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store i32 0, i32* %d.addr, align 4
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%r2 = call i32 @safe_div(i32* %n.addr, i32* %d.addr)
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call void (i8*, ...) @printf(i8* getelementptr ([21 x i8], [21 x i8]* @str_result, i32 0, i32 0), i32 %r2)
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%r3 = call i32 @safe_div(i32* %n.addr, i32* null)
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call void (i8*, ...) @printf(i8* getelementptr ([21 x i8], [21 x i8]* @str_result, i32 0, i32 0), i32 %r3)
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ret i32 0
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}
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declare i32 @__C_specific_handler(...)
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declare i32 @llvm.eh.typeid.for(i8*) readnone nounwind
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declare void @puts(i8*)
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declare void @printf(i8*, ...)
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declare void @abort()
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