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In setupEntryBlockAndCallSites in CodeGen/SjLjEHPrepare.cpp, we fetch and store the actual frame pointer, but on return via the longjmp intrinsic, it always was restored into the r7 variable. On windows, the frame pointer should be restored into r11 instead of r7. On Darwin (where sjlj exception handling is used by default), the frame pointer is always r7, both in arm and thumb mode, and likewise, on windows, the frame pointer always is r11. On linux however, if sjlj exception handling is enabled (which it isn't by default), libcxxabi and the user code can be built in differing modes using different registers as frame pointer. Therefore, when restoring registers on a platform where we don't always use the same register depending on code mode, restore both r7 and r11. Differential Revision: https://reviews.llvm.org/D38253 llvm-svn: 314451
126 lines
4.0 KiB
LLVM
126 lines
4.0 KiB
LLVM
; RUN: llc %s -o - | FileCheck %s
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; RUN: llc -mtriple=armv7-linux -exception-model sjlj %s -o - | FileCheck %s -check-prefix CHECK-LINUX
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; RUN: llc -mtriple=thumbv7-win32 -exception-model sjlj %s -o - | FileCheck %s -check-prefix CHECK-WIN32
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target triple = "armv7-apple-ios"
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declare i32 @llvm.eh.sjlj.setjmp(i8*)
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declare void @llvm.eh.sjlj.longjmp(i8*)
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@g = external global i32
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declare void @may_throw()
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declare i32 @__gxx_personality_sj0(...)
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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declare i32 @llvm.eh.typeid.for(i8*)
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declare i8* @llvm.frameaddress(i32)
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declare i8* @llvm.stacksave()
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@_ZTIPKc = external constant i8*
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; CHECK-LABEL: foobar
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;
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; setjmp sequence:
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; CHECK: add [[PCREG:r[0-9]+]], pc, #8
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; CHECK-NEXT: str [[PCREG]], {{\[}}[[BUFREG:r[0-9]+]], #4]
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; CHECK-NEXT: mov r0, #0
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; CHECK-NEXT: add pc, pc, #0
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; CHECK-NEXT: mov r0, #1
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;
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; longjmp sequence:
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; CHECK: ldr sp, [{{\s*}}[[BUFREG:r[0-9]+]], #8]
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; CHECK-NEXT: ldr [[DESTREG:r[0-9]+]], {{\[}}[[BUFREG]], #4]
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; CHECK-NEXT: ldr r7, {{\[}}[[BUFREG]]{{\]}}
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; CHECK-NEXT: bx [[DESTREG]]
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; CHECK-LINUX: ldr sp, [{{\s*}}[[BUFREG:r[0-9]+]], #8]
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; CHECK-LINUX-NEXT: ldr [[DESTREG:r[0-9]+]], {{\[}}[[BUFREG]], #4]
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; CHECK-LINUX-NEXT: ldr r7, {{\[}}[[BUFREG]]{{\]}}
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; CHECK-LINUX-NEXT: ldr r11, {{\[}}[[BUFREG]]{{\]}}
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; CHECK-LINUX-NEXT: bx [[DESTREG]]
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; CHECK-WIN32: ldr.w r11, [{{\s*}}[[BUFREG:r[0-9]+]]]
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; CHECK-WIN32-NEXT: ldr.w sp, {{\[}}[[BUFREG]], #8]
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; CHECK-WIN32-NEXT: ldr.w pc, {{\[}}[[BUFREG]], #4]
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define void @foobar() {
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entry:
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%buf = alloca [5 x i8*], align 4
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%arraydecay = getelementptr inbounds [5 x i8*], [5 x i8*]* %buf, i32 0, i32 0
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%bufptr = bitcast i8** %arraydecay to i8*
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; Note: This is simplified, in reality you have to store the framepointer +
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; stackpointer in the buffer as well for this to be legal!
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%setjmpres = call i32 @llvm.eh.sjlj.setjmp(i8* %bufptr)
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%tobool = icmp ne i32 %setjmpres, 0
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br i1 %tobool, label %if.then, label %if.else
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if.then:
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store volatile i32 1, i32* @g, align 4
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br label %if.end
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if.else:
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store volatile i32 0, i32* @g, align 4
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call void @llvm.eh.sjlj.longjmp(i8* %bufptr)
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unreachable
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if.end:
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ret void
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}
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; CHECK-LABEL: combine_sjlj_eh_and_setjmp_longjmp
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; Check that we can mix sjlj exception handling with __builtin_setjmp
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; and __builtin_longjmp.
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;
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; setjmp sequence:
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; CHECK: add [[PCREG:r[0-9]+]], pc, #8
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; CHECK-NEXT: str [[PCREG]], {{\[}}[[BUFREG:r[0-9]+]], #4]
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; CHECK-NEXT: mov r0, #0
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; CHECK-NEXT: add pc, pc, #0
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; CHECK-NEXT: mov r0, #1
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;
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; longjmp sequence:
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; CHECK: ldr sp, [{{\s*}}[[BUFREG:r[0-9]+]], #8]
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; CHECK-NEXT: ldr [[DESTREG:r[0-9]+]], {{\[}}[[BUFREG]], #4]
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; CHECK-NEXT: ldr r7, {{\[}}[[BUFREG]]{{\]}}
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; CHECK-NEXT: bx [[DESTREG]]
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define void @combine_sjlj_eh_and_setjmp_longjmp() personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*) {
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entry:
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%buf = alloca [5 x i8*], align 4
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invoke void @may_throw() to label %try.cont unwind label %lpad
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lpad:
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%0 = landingpad { i8*, i32 } catch i8* bitcast (i8** @_ZTIPKc to i8*)
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%1 = extractvalue { i8*, i32 } %0, 1
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%2 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIPKc to i8*)) #3
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%matches = icmp eq i32 %1, %2
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br i1 %matches, label %catch, label %eh.resume
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catch:
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%3 = extractvalue { i8*, i32 } %0, 0
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%4 = tail call i8* @__cxa_begin_catch(i8* %3) #3
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store volatile i32 0, i32* @g, align 4
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%5 = bitcast [5 x i8*]* %buf to i8*
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%arraydecay = getelementptr inbounds [5 x i8*], [5 x i8*]* %buf, i64 0, i64 0
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%6 = tail call i8* @llvm.frameaddress(i32 0)
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store i8* %6, i8** %arraydecay, align 16
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%7 = tail call i8* @llvm.stacksave()
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%8 = getelementptr [5 x i8*], [5 x i8*]* %buf, i64 0, i64 2
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store i8* %7, i8** %8, align 16
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%9 = call i32 @llvm.eh.sjlj.setjmp(i8* %5)
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%tobool = icmp eq i32 %9, 0
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br i1 %tobool, label %if.else, label %if.then
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if.then:
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store volatile i32 2, i32* @g, align 4
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call void @__cxa_end_catch() #3
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br label %try.cont
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if.else:
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store volatile i32 1, i32* @g, align 4
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call void @llvm.eh.sjlj.longjmp(i8* %5)
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unreachable
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eh.resume:
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resume { i8*, i32 } %0
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try.cont:
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ret void
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}
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