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f85a029a33
This adds support to the backed to actually support SjLj EH as an exception model. This is *NOT* the default model, and requires explicitly opting into it from the frontend. GCC supports this model and for MinGW can still be enabled via the `--using-sjlj-exceptions` options. Addresses PR27749! llvm-svn: 271244
73 lines
2.1 KiB
LLVM
73 lines
2.1 KiB
LLVM
; RUN: llc -mtriple i386-windows-gnu -exception-model sjlj -filetype asm -o - %s | FileCheck %s
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declare void @_Z20function_that_throwsv()
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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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define void @_Z8functionv() personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*) {
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entry:
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invoke void @_Z20function_that_throwsv()
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to label %try.cont unwind label %lpad
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lpad:
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%0 = landingpad { i8*, i32 }
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catch i8* null
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%1 = extractvalue { i8*, i32 } %0, 0
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%2 = tail call i8* @__cxa_begin_catch(i8* %1)
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tail call void @__cxa_end_catch()
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br label %try.cont
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try.cont:
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ret void
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}
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; struct _Unwind_FunctionContext {
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; +00 struct _Unwind_FunctionContext *prev; -64(%ebp)
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; +04 uintptr_t __callsite; -60(%ebp)
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; +08 uintptr_t __buffer[4]; -44(%ebp)
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; +28 __personality_routine __personality; -40(%ebp)
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; +32 uintptr_t __lsda; -36(%ebp)
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; +36 void *__jbuf[]; -32(%ebp)
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; };
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; CHECK-LABEL: __Z8functionv:
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; struct _Unwind_FunctionContext UFC;
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;
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; UFC.__personality = __gxx_personality_sj0
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; CHECK: movl $___gxx_personality_sj0, -40(%ebp)
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; UFC.__lsda = $LSDA
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; CHECK: movl $[[LSDA:GCC_except_table[0-9]+]], -36(%ebp)
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; UFC.__jbuf[0] = $EBP
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; CHECK: movl %ebp, -32(%ebp)
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; UFC.__jbuf[2] = $ESP
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; CHECK: movl %esp, -24(%ebp)
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; UFC.__jbuf[1] = $EIP
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; CHECK: movl $[[RESUME:LBB[0-9]+_[0-9]+]], -28(%ebp)
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; UFC.__callsite = 1
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; CHECK: movl $1, -60(%ebp)
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; _Unwind_SjLj_Register(&UFC);
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; CHECK: leal -64(%ebp), %eax
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; CHECK: pushl %eax
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; CHECK: calll __Unwind_SjLj_Register
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; CHECK: addl $4, %esp
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; function_that_throws();
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; CHECK: calll __Z20function_that_throwsv
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; _Unwind_SjLj_Unregister(&UFC);
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; CHECK: leal -64(%ebp), %eax
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; CHECK: calll __Unwind_SjLj_Unregister
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;
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; CHECK: [[RESUME]]:
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; CHECK: leal -64(%ebp), %esi
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; assert(UFC.__callsite <= 1);
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; CHECK: movl -60(%ebp), %eax
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; CHECK: cmpl $1, %eax
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; CHECK: jbe [[CONT:LBB[0-9]+_[0-9]+]]
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; CHECK: ud2
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; CHECK: [[CONT]]:
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; *Handlers[--UFC.__callsite]
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; CHECK: subl $1, %eax
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; CHECK: jmpl *LJTI
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