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b667d698ac
The size savings are significant, and from what I can tell, both ICC and GCC do this. Differential Revision: http://reviews.llvm.org/D18573 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264966 91177308-0d34-0410-b5e6-96231b3b80d8
208 lines
6.3 KiB
LLVM
208 lines
6.3 KiB
LLVM
; RUN: llc -mtriple=i686-pc-windows-msvc < %s | FileCheck %s --check-prefix=X86
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; RUN: llc -mtriple=x86_64-pc-windows-msvc < %s | FileCheck %s --check-prefix=X64
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; Based on this source:
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; extern "C" void may_throw(int);
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; void f() {
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; try {
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; may_throw(1);
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; try {
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; may_throw(2);
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; } catch (int) {
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; may_throw(3);
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; }
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; } catch (int) {
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; may_throw(4);
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; }
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; }
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%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
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%eh.CatchHandlerType = type { i32, i8* }
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declare void @may_throw(i32)
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declare i32 @__CxxFrameHandler3(...)
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declare void @llvm.eh.begincatch(i8*, i8*)
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declare void @llvm.eh.endcatch()
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declare i32 @llvm.eh.typeid.for(i8*)
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$"\01??_R0H@8" = comdat any
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@"\01??_7type_info@@6B@" = external constant i8*
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@"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
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@llvm.eh.handlertype.H.0 = private unnamed_addr constant %eh.CatchHandlerType { i32 0, i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*) }, section "llvm.metadata"
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define void @f() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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invoke void @may_throw(i32 1)
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to label %invoke.cont unwind label %lpad.1
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invoke.cont: ; preds = %entry
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invoke void @may_throw(i32 2)
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to label %try.cont.9 unwind label %lpad
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try.cont.9: ; preds = %invoke.cont.3, %invoke.cont, %catch.7
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ret void
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lpad: ; preds = %catch, %entry
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%cs1 = catchswitch within none [label %catch] unwind label %lpad.1
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catch: ; preds = %lpad.1
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%p1 = catchpad within %cs1 [%rtti.TypeDescriptor2* @"\01??_R0H@8", i32 0, i8* null]
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invoke void @may_throw(i32 3) [ "funclet"(token %p1) ]
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to label %invoke.cont.3 unwind label %lpad.1
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invoke.cont.3: ; preds = %catch
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catchret from %p1 to label %try.cont.9
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lpad.1: ; preds = %invoke.cont
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%cs2 = catchswitch within none [label %catch.7] unwind to caller
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catch.7:
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%p2 = catchpad within %cs2 [%rtti.TypeDescriptor2* @"\01??_R0H@8", i32 0, i8* null]
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call void @may_throw(i32 4) [ "funclet"(token %p2) ]
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catchret from %p2 to label %try.cont.9
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}
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; X86-LABEL: _f:
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; X86: movl $-1, [[state:[-0-9]+]](%ebp)
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; X86: movl $___ehhandler$f, {{.*}}
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;
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; X86: movl $0, [[state]](%ebp)
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; X86: pushl $1
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; X86: calll _may_throw
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;
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; X86: movl $1, [[state]](%ebp)
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; X86: pushl $2
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; X86: calll _may_throw
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;
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; X86: movl $2, [[state]](%ebp)
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; X86: pushl $3
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; X86: calll _may_throw
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;
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; X86: movl $3, [[state]](%ebp)
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; X86: pushl $4
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; X86: calll _may_throw
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; X64-LABEL: f:
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; X64-LABEL: $ip2state$f:
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; X64-NEXT: .long .Lfunc_begin0@IMGREL
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; X64-NEXT: .long -1
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; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
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; X64-NEXT: .long 0
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; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
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; X64-NEXT: .long 1
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; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
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; X64-NEXT: .long -1
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; X64-NEXT: .long "?catch${{.*}}@?0?f@4HA"@IMGREL
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; X64-NEXT: .long 2
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; X64-NEXT: .long "?catch${{.*}}@?0?f@4HA"@IMGREL
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; X64-NEXT: .long 3
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; Based on this source:
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; extern "C" void may_throw(int);
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; struct S { ~S(); };
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; void g() {
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; S x;
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; try {
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; may_throw(-1);
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; } catch (...) {
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; may_throw(0);
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; {
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; S y;
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; may_throw(1);
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; }
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; may_throw(2);
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; }
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; }
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%struct.S = type { i8 }
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declare void @"\01??1S@@QEAA@XZ"(%struct.S*)
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define void @g() personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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%x = alloca %struct.S, align 1
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%y = alloca %struct.S, align 1
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invoke void @may_throw(i32 -1)
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to label %unreachable unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch] unwind label %ehcleanup5
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catch: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* null, i32 64, i8* null]
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invoke void @may_throw(i32 0) [ "funclet"(token %1) ]
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to label %invoke.cont unwind label %ehcleanup5
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invoke.cont: ; preds = %catch
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invoke void @may_throw(i32 1) [ "funclet"(token %1) ]
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to label %invoke.cont2 unwind label %ehcleanup
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invoke.cont2: ; preds = %invoke.cont
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invoke void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %y) [ "funclet"(token %1) ]
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to label %invoke.cont3 unwind label %ehcleanup5
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invoke.cont3: ; preds = %invoke.cont2
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invoke void @may_throw(i32 2) [ "funclet"(token %1) ]
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to label %invoke.cont4 unwind label %ehcleanup5
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invoke.cont4: ; preds = %invoke.cont3
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catchret from %1 to label %try.cont
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try.cont: ; preds = %invoke.cont4
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call void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %x)
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ret void
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ehcleanup: ; preds = %invoke.cont
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%2 = cleanuppad within %1 []
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call void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %y) [ "funclet"(token %2) ]
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cleanupret from %2 unwind label %ehcleanup5
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ehcleanup5: ; preds = %invoke.cont2, %invoke.cont3, %ehcleanup, %catch, %catch.dispatch
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%3 = cleanuppad within none []
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call void @"\01??1S@@QEAA@XZ"(%struct.S* nonnull %x) [ "funclet"(token %3) ]
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cleanupret from %3 unwind to caller
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unreachable: ; preds = %entry
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unreachable
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}
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; X86-LABEL: _g:
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; X86: movl $-1, [[state:[-0-9]+]](%ebp)
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; X86: movl $___ehhandler$g, {{.*}}
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;
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; X86: movl $1, [[state]](%ebp)
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; X86: pushl $-1
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; X86: calll _may_throw
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;
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; X86: movl $2, [[state]](%ebp)
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; X86: pushl $0
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; X86: calll _may_throw
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;
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; X86: movl $3, [[state]](%ebp)
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; X86: pushl $1
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; X86: calll _may_throw
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;
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; X86: movl $2, [[state]](%ebp)
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; X86: pushl $2
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; X86: calll _may_throw
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; X64-LABEL: g:
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; X64-LABEL: $ip2state$g:
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; X64-NEXT: .long .Lfunc_begin1@IMGREL
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; X64-NEXT: .long -1
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; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
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; X64-NEXT: .long 1
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; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
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; X64-NEXT: .long -1
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; X64-NEXT: .long "?catch${{.*}}@?0?g@4HA"@IMGREL
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; X64-NEXT: .long 2
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; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
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; X64-NEXT: .long 3
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; X64-NEXT: .long .Ltmp{{.*}}@IMGREL+1
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; X64-NEXT: .long 2
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; X86: .safeseh ___ehhandler$f
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; X86: .safeseh ___ehhandler$g
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