search for: lpad

...ame stack slot for all of them to save stack space. However, clang/llvm currently allocates separate slots for each of the three variables because clang doesn't insert lifetime.end markers after the objects are destructed (for example, the destructor of the first string is called in block "lpad" in line 71 of the attached bitcode f1.ll, but there is no lifetime.end marker inserted). If we want to insert the missing lifetime.end markers for the strings, we'll have to insert them at the beginning of lpad's successors, %eh.resume and %terminate.lpad, because the destructor call...

...alloca i8* %ehselector.slot = alloca i32 %inner = alloca %class.Inner, align 1 %en = alloca i32, align 4 store i32* %i, i32** %i.addr, align 8 call void @_ZN5OuterC1Ev(%class.Outer* %outer) invoke void @_ZN6MiddleC1Ev(%class.Middle* %middle) to label %invoke.cont unwind label %lpad invoke.cont: ; preds = %entry %0 = load i32** %i.addr, align 8 %1 = load i32* %0, align 4 %cmp = icmp eq i32 %1, 1 br i1 %cmp, label %if.then, label %if.else if.then: ; preds = %invoke.cont invoke void @_Z12do...

...Let me explain to see if we agree on what the problem is. Suppose we don't artificially add catch-alls to selectors. Then the above example compiles to: define void @_Z1fv() { ... invoke void @__cxa_throw( something ) noreturn to label %somewhere unwind label %lpad ... lpad: %eh_ptr = tail call i8* @llvm.eh.exception( ) %eh_select8 = tail call i32 (i8*, i8*, ...)* @llvm.eh.selector.i32( i8* %eh_ptr, i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)) tail call i32 (...)* @_Unwind_Resume( i8* %eh_ptr ) unreachable ... } defi...

...mple: class A {}; class B {}; int i; extern void f(); void g() { try { f(); } catch(A) { i = 1; } } void h() { try { g(); } catch(B) { i = 2; } } Without catch-alls this compiles to something like: define void @_Z1gv() { entry: invoke void @_Z1fv( ) to label %UnifiedReturnBlock unwind label %lpad ... lpad: ; preds = %entry %eh_ptr = tail call i8* @llvm.eh.exception( ) %eh_select = tail call i32 (i8*, i8*, ...)* @llvm.eh.selector.i32( i8* %eh_ptr, i32 (...)* @__gxx_personality_v0, i8* A) %eh_typeid = tail call i32 @llvm.eh.typeid.for.i32( i8* A ) %tmp15 = icmp eq i32 %eh_select, %eh_typ...

(Mail system seems to have eaten this, sorry if it's a repeat) On Dec 8, 2007, at 12:48 AM, Duncan Sands wrote: > Hi Dale, > >> - Why was C++ claiming that every selector has a catch-all handler? > > this is easy: because the semantics of invoke require it. Yes, > really. > If unwinding reaches an invoke then control is required to jump to the > unwind basic

...s by not calling the empty constructors. bb1, bb2, and bb3 are the normal calls to the d'tors that we expect. > 2. In catch.handlers, the resume label is to %onto.catch.handlers, right? > Oh…I forgot to fill that in. It should to go %yikes. > 3. In onto.catch.handlers you resume to %lpad. Which basic-block is > this? Shouldn't this be a "resume_unwinding" call of some sort (if Q2 > is right)? > This was necessary to keep the invariant that only resume or unwind edges may jump to a landing pad (%lpad in this instance). Otherwise, I would have the invoke in a....

On Dec 10, 2007, at 11:38 AM, Duncan Sands wrote: >>> ... If you force a "cleanup" by changing the selector call to: >>> %eh_select8.i = tail call i32 (i8*, i8*, ...)* >>> @llvm.eh.selector.i32( i8* %eh_ptr.i, i8* bitcast (i32 (...)* >>> @__gxx_personality_v0 to i8*), i32 0) >>> then it doesn't work either: the unwinder observes that

...o i32* ; <i32*> [#uses=1] 50 store i32 78, i32* %1, align 4 51 invoke void @__cxa_throw(i8* %0, i8* bitcast (%struct.__fundamental_type_info_pseudo* @_ZTIi to i8*), void (i8*)* null) noreturn 52 to label %invcont unwind label %lpad 53 54 invcont: ; preds = %entry 55 unreachable 56 57 bb: ; preds = %lpad 58 %2 = tail call i8* @__cxa_begin_catch(i8* %eh_ptr) nounwind ; <i8*> [#uses=0] 59 %3 = invoke %"struct.std::basic_ost...

...currently accomplish my aims in the controller like so: ----------- class AdminUnitsController < ApplicationController #snip def create @unit = Unit.new(params[:unit]) @unit.prices.create("price" => params[:price]) @levels = Level.find(:all, :order => "LPAD (`levels`.`elevator_number`,5,\"0\") ASC") @unit_types = UnitType.find(:all, :order => "`unit_types`.`name` ASC") if @unit.save Unit.find(@unit.id).update_attributes(params[:unit]) flash[:notice] = ''Unit was successfully created.'&...

...; preds = %entry > br i1 undef, label %bb4, label %bb5 > > bb4: ; preds = %bb3 > unreachable > > bb5: ; preds = %bb3 > invoke void undef() > to label %invcont unwind label %lpad > > invcont: ; preds = %bb5 > %0 = invoke i8 @system__tasking__async_delays__enqueue_duration(i64 > undef, %struct.system__tasking__async_delays__delay_block* undef) > to label %bb8 unwind label %lpad ; <i8> [#uses=0]...

...} } __except (x = 1) { } } The IR for the path from "x = 2" to the load of x in the __finally (via the exception edge) looks like so: store i32 2, i32* %x, align 4 invoke void bitcast (void (...)* @may_throw to void ()*)() #4 to label %invoke.cont unwind label %lpad lpad: ; preds = %entry %1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*) cleanup catch i8* bitcast (i32 (i8*, i8*)* @"\01?filt$0 at 0@foo@@" to i8*) %2 = extractvalue { i8*, i...

...;;;;;;;;;;;;;;;;;;;; ; Function Attrs: uwtable define void @_Z4testv() #0 { entry: %outer = alloca %class.Outer, align 1 %inner = alloca %class.Inner, align 1 call void @llvm.eh.setehstate(i32 0) invoke void @_ZN5OuterC1Ev(%class.Outer* %outer) to label %invoke.cont unwind label %lpad invoke.cont: call void @llvm.eh.setehstate(i32 1) call void @llvm.eh.setehstate(i32 2) invoke void @_ZN5InnerC1Ev(%class.Inner* %inner) to label %invoke.cont1 unwind label %lpad invoke.cont.1: call void @llvm.eh.setehstate(i32 3) invoke void @_Z14do_inner_thingv() to...

....ca: %t6 = call i8* @__cxa_begin_catch(i8* %eh_ptr) nounwind %t7 = call i32 @puts(i8* getelementptr inbounds ([9 x i8]* @.str2, i64 0, i64 0)) call void @__cxa_end_catch() ret void ;; C's d'tor c.dtor: invoke void @_ZN1CD1Ev(%struct.C* %c) to label %b.dtor unwind label %lpad.c.dtor ;; B's d'tor b.dtor: invoke void @_ZN1BD1Ev(%struct.B* %b) to label %a.dtor unwind label %lpad.b.dtor ;; A's d'tor a.dtor: landingpad invoke void @_ZN1AD1Ev(%struct.A* %a) to label %onto.catch.handlers unwind label %lpad.a.dtor onto.catch.handlers:...

On Aug 5, 2011, at 10:57 AM, Peter Lawrence wrote: > However it seems that if a landingpad-block has multiple predecessors (often the case, > multiple InvokeInst in the main body of a try-statement all go to the same landingpad- > block), then you cannot move the LandingpadInst in order to break a critical edge unless > you do it for _all_ landingpad-block predecessor edges

...1 undef, label %bb4, label %bb5 >> >> bb4: ; preds = %bb3 >> unreachable >> >> bb5: ; preds = %bb3 >> invoke void undef() >> to label %invcont unwind label %lpad >> >> invcont: ; preds = %bb5 >> %0 = invoke i8 @system__tasking__async_delays__enqueue_duration(i64 >> undef, %struct.system__tasking__async_delays__delay_block* undef) >> to label %bb8 unwind label %lpad ; &...

...o i32* ; <i32*> [#uses=1] 12 store i32 34, i32* %1, align 4 13 invoke void @__cxa_throw(i8* %0, i8* bitcast (%struct.__fundamental_type_info_pseudo* @_ZTIi to i8*), void (i8*)* null) noreturn 14 to label %invcont unwind label %lpad 15 16 invcont: ; preds = %entry 17 unreachable 18 19 lpad: ; preds = %entry 20 %eh_ptr = tail call i8* @llvm.eh.exception() ; <i8*> [#uses=2] 21 %eh_select = tail call i32 (i8*, i8*, ...)* @llvm.eh.selector.i32...

responses to the Exception Handling Proposal are "all over the map", including at least.... 1. what are the semantics of the various high level languages, and how are these constructs to be lowered into an IR 2. what should the IR be 3. what should the final output code format and layout be, and to what extent can/should this be compatible with any existing runtime environments

...l %bb5 >>> >>> bb4: ; preds = %bb3 >>> unreachable >>> >>> bb5: ; preds = %bb3 >>> invoke void undef() >>> to label %invcont unwind label %lpad >>> >>> invcont: ; preds = %bb5 >>> %0 = invoke i8 >>> @system__tasking__async_delays__enqueue_duration(i64 undef, >>> %struct.system__tasking__async_delays__delay_block* undef) >>> to label...

...landing pad. Given this important distinction it may make sense to make landing pad blocks special in the IR to facility detecting misuse (both pragmatically and visually). The following pseudo-IR tries to demonstrate the validity of assignments: main: %a = no_fail_instruction test: unwind to lpad %r = possible_failing_comparison %a, 0 br %r == 0, label true_block, label false_block true_block: unwind to lpad %c = no_fail_instruction %d = potentially_failing_instruction %c br label either_block false_block: unwind to lpad %e = no_fail_instruction %f = potentially_faili...

...i8] c"caught integer %d\0A\00", align 1 > @.str1 = private unnamed_addr constant [18 x i8] c"caught double %g\0A\00", align 1 > > define i32 @_Z3foov() uwtable optsize ssp { > entry: > invoke void @_Z3barv() optsize > to label %try.cont unwind label %lpad > > invoke.cont7: > %tmp0 = tail call i8* @__cxa_begin_catch(i8* %exn) nounwind > %tmp1 = bitcast i8* %tmp0 to i32* > %exn.scalar = load i32* %tmp1, align 4 > %call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([19 x i8]* @.str, i64 0, i64 0), >...