forked from OSchip/llvm-project
[StackColoring] Conservatively merge catch point of V for catch(V)
Reviewed By: thanm, clin1 Differential Revision: https://reviews.llvm.org/D86673
This commit is contained in:
Xiang1 Zhang
parent
4b11201592
commit
7ba3293691
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@ -373,6 +373,36 @@ STATISTIC(EscapedAllocas, "Number of allocas that escaped the lifetime region");
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// before visiting the memcpy block (which will contain the lifetime start
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// for "b" then it will appear that 'b' has a degenerate lifetime.
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//
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// Handle Windows Exception with LifetimeStartOnFirstUse:
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// -----------------
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//
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// There was a bug for using LifetimeStartOnFirstUse in win32.
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// class Type1 {
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// ...
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// ~Type1(){ write memory;}
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// }
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// ...
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// try{
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// Type1 V
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// ...
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// } catch (Type2 X){
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// ...
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// }
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// For variable X in catch(X), we put point pX=&(&X) into ConservativeSlots
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// to prevent using LifetimeStartOnFirstUse. Because pX may merged with
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// object V which may call destructor after implicitly writing pX. All these
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// are done in C++ EH runtime libs (through CxxThrowException), and can't
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// obviously check it in IR level.
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//
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// The loader of pX, without obvious writing IR, is usually the first LOAD MI
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// in EHPad, Some like:
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// bb.x.catch.i (landing-pad, ehfunclet-entry):
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// ; predecessors: %bb...
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// successors: %bb...
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// %n:gr32 = MOV32rm %stack.pX ...
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// ...
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// The Type2** %stack.pX will only be written in EH runtime libs, so we
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// check the StoreSlots to screen it out.
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namespace {
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@ -434,6 +464,9 @@ class StackColoring : public MachineFunctionPass {
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/// slots lifetime-start-on-first-use is disabled).
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BitVector ConservativeSlots;
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/// Record the FI slots referenced by a 'may write to memory'.
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BitVector StoreSlots;
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/// Number of iterations taken during data flow analysis.
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unsigned NumIterations;
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@ -629,10 +662,13 @@ unsigned StackColoring::collectMarkers(unsigned NumSlot) {
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InterestingSlots.resize(NumSlot);
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ConservativeSlots.clear();
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ConservativeSlots.resize(NumSlot);
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StoreSlots.clear();
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StoreSlots.resize(NumSlot);
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// number of start and end lifetime ops for each slot
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SmallVector<int, 8> NumStartLifetimes(NumSlot, 0);
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SmallVector<int, 8> NumEndLifetimes(NumSlot, 0);
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SmallVector<int, 8> NumLoadInCatchPad(NumSlot, 0);
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// Step 1: collect markers and populate the "InterestingSlots"
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// and "ConservativeSlots" sets.
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@ -687,6 +723,13 @@ unsigned StackColoring::collectMarkers(unsigned NumSlot) {
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if (! BetweenStartEnd.test(Slot)) {
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ConservativeSlots.set(Slot);
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}
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// Here we check the StoreSlots to screen catch point out. For more
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// information, please refer "Handle Windows Exception with
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// LifetimeStartOnFirstUse" at the head of this file.
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if (MI.mayStore())
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StoreSlots.set(Slot);
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if (MF->getWinEHFuncInfo() && MBB->isEHPad() && MI.mayLoad())
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NumLoadInCatchPad[Slot] += 1;
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}
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}
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}
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@ -697,11 +740,14 @@ unsigned StackColoring::collectMarkers(unsigned NumSlot) {
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return 0;
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}
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// PR27903: slots with multiple start or end lifetime ops are not
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// 1) PR27903: slots with multiple start or end lifetime ops are not
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// safe to enable for "lifetime-start-on-first-use".
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for (unsigned slot = 0; slot < NumSlot; ++slot)
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if (NumStartLifetimes[slot] > 1 || NumEndLifetimes[slot] > 1)
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// 2) And also not safe for variable X in catch(X) in windows.
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for (unsigned slot = 0; slot < NumSlot; ++slot) {
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if (NumStartLifetimes[slot] > 1 || NumEndLifetimes[slot] > 1 ||
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(NumLoadInCatchPad[slot] > 1 && !StoreSlots.test(slot)))
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ConservativeSlots.set(slot);
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}
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LLVM_DEBUG(dumpBV("Conservative slots", ConservativeSlots));
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// Step 2: compute begin/end sets for each block
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@ -0,0 +1,435 @@
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# RUN: llc -mtriple="i386-pc-windows-msvc" -run-pass=stack-coloring %s -o - | FileCheck %s
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# There is a problem with the exception handler, we found in windows, when set
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# LifetimeStartOnFirstUse=true for stack-coloring in default. Take the following
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# case for example:
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#
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#// Compile with "clang-cl -m32 -O2 -EHs test.cpp"
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#__attribute__((noinline,nothrow,weak)) void escape(int *p) { }
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#struct object {
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# int i;
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# object() {
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# i = 1;
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# }
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# ~object() {
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# // if "object" and "exp" are assigned to the same slot,
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# // this assign will corrupt "exp".
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# i = 9999;
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# escape(&i);
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# }
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#};
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#inline void throwit() { throw 999; }
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#
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#volatile int v;
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#inline void func() {
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# try {
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# object o;
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# throwit();
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# }
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# // "exp" is written by the OS when the "throw" occurs.
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# // Then the destructor is called, and the store-assign
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# // clobbers the value of "exp".
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# // The dereference of "exp" (with value 9999) causes a crash.
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# // All these done in libruntime, so it is hard to check in IR.
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# catch (int &exp) {
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# v = exp;
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# }
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#}
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#
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#int main() {
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# func();
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# return 0;
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#}
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## Make sure that o.i not merge with exp.i
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# CHECK: stack:
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# CHECK: id: 2, name: o.i, type: default, offset: 0, size: 4, alignment: 4,
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# CHECK: id: 3, name: exp.i, type: default, offset: 0, size: 4, alignment: 4,
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## Make sure that %stack.3.exp.i not replaced with %stack.2.o.i
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# CHECK: bb.3.catch.i (landing-pad, ehfunclet-entry):
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# CHECK: %7:gr32 = MOV32rm %stack.3.exp.i, 1, $noreg, 0, $noreg :: (dereferenceable load 4 from %ir.exp.i)
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--- |
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; ModuleID = 'test-pre-stc.mir'
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source_filename = "test.cpp"
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target datalayout = "e-m:x-p:32:32-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:32-n8:16:32-a:0:32-S32"
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%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
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%eh.CatchableType = type { i32, i8*, i32, i32, i32, i32, i8* }
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%eh.CatchableTypeArray.1 = type { i32, [1 x %eh.CatchableType*] }
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%eh.ThrowInfo = type { i32, i8*, i8*, i8* }
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%CXXExceptionRegistration = type { i8*, %EHRegistrationNode, i32 }
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%EHRegistrationNode = type { %EHRegistrationNode*, i8* }
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%struct.object = type { i32 }
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$"_R0H@8" = comdat any
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$"_CT_R0H@84" = comdat any
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$_CTA1H = comdat any
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$_TI1H = comdat any
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@v__3HC = dso_local global i32 0, align 4
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@"_7type_info__6B@" = external constant i8*
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@"_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"_7type_info__6B@", i8* null, [3 x i8] c".H\00" }, comdat
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@"_CT_R0H@84" = linkonce_odr unnamed_addr constant %eh.CatchableType { i32 1, i8* bitcast (%rtti.TypeDescriptor2* @"_R0H@8" to i8*), i32 0, i32 -1, i32 0, i32 4, i8* null }, section ".xdata", comdat
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@_CTA1H = linkonce_odr unnamed_addr constant %eh.CatchableTypeArray.1 { i32 1, [1 x %eh.CatchableType*] [%eh.CatchableType* @"_CT_R0H@84"] }, section ".xdata", comdat
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@_TI1H = linkonce_odr unnamed_addr constant %eh.ThrowInfo { i32 0, i8* null, i8* null, i8* bitcast (%eh.CatchableTypeArray.1* @_CTA1H to i8*) }, section ".xdata", comdat
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; Function Attrs: noinline nounwind sspstrong
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define weak dso_local void @"escape__YAXPAH@Z"(i32* %p) local_unnamed_addr #0 {
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entry:
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ret void
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}
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; Function Attrs: norecurse sspstrong
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define dso_local i32 @main() local_unnamed_addr #1 personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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%0 = alloca %CXXExceptionRegistration, align 4
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%1 = bitcast %CXXExceptionRegistration* %0 to i8*
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call void @llvm.x86.seh.ehregnode(i8* %1)
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%2 = call i8* @llvm.stacksave()
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%3 = getelementptr inbounds %CXXExceptionRegistration, %CXXExceptionRegistration* %0, i32 0, i32 0
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store i8* %2, i8** %3, align 4
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%4 = getelementptr inbounds %CXXExceptionRegistration, %CXXExceptionRegistration* %0, i32 0, i32 2
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store i32 -1, i32* %4, align 4
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%5 = getelementptr inbounds %CXXExceptionRegistration, %CXXExceptionRegistration* %0, i32 0, i32 1
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%6 = getelementptr inbounds %EHRegistrationNode, %EHRegistrationNode* %5, i32 0, i32 1
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store i8* bitcast (i32 (i8*, i8*, i8*, i8*)* @"__ehhandler$main" to i8*), i8** %6, align 4
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%7 = load %EHRegistrationNode*, %EHRegistrationNode* addrspace(257)* null, align 4
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%8 = getelementptr inbounds %EHRegistrationNode, %EHRegistrationNode* %5, i32 0, i32 0
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store %EHRegistrationNode* %7, %EHRegistrationNode** %8, align 4
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store %EHRegistrationNode* %5, %EHRegistrationNode* addrspace(257)* null, align 4
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%tmp.i.i = alloca i32, align 4
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%o.i = alloca %struct.object, align 4
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%zx = alloca i32*, align 4
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%exp.i = alloca i32*, align 4
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%9 = bitcast i32** %exp.i to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %9)
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%10 = bitcast %struct.object* %o.i to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %10) #7
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%i.i.i1 = bitcast %struct.object* %o.i to i32*
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store i32 1, i32* %i.i.i1, align 4
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%11 = bitcast i32* %tmp.i.i to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %11)
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store i32 999, i32* %tmp.i.i, align 4
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%12 = getelementptr inbounds %CXXExceptionRegistration, %CXXExceptionRegistration* %0, i32 0, i32 2
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store i32 1, i32* %12, align 4
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invoke void @_CxxThrowException(i8* nonnull %11, %eh.ThrowInfo* nonnull @_TI1H) #8
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to label %.noexc.i unwind label %ehcleanup.i
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.noexc.i: ; preds = %entry
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unreachable
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ehcleanup.i: ; preds = %entry
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%13 = cleanuppad within none []
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%14 = bitcast %struct.object* %o.i to i32*
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%15 = bitcast %struct.object* %o.i to i8*
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store i32 9999, i32* %14, align 4
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call void @"escape__YAXPAH@Z"(i32* nonnull %14) #7 [ "funclet"(token %13) ]
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %15) #7
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cleanupret from %13 unwind label %catch.dispatch.i
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catch.dispatch.i: ; preds = %ehcleanup.i
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%16 = catchswitch within none [label %catch.i] unwind to caller
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catch.i: ; preds = %catch.dispatch.i
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%17 = catchpad within %16 [%rtti.TypeDescriptor2* @"_R0H@8", i32 8, i32** %exp.i]
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%18 = load i32*, i32** %exp.i, align 4
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%19 = load i32, i32* %18, align 4
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store atomic volatile i32 %19, i32* @v__3HC release, align 4
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catchret from %17 to label %func__YAXXZ.exit
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func__YAXXZ.exit: ; preds = %catch.i
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%20 = bitcast i32** %exp.i to i8*
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %20)
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%21 = getelementptr inbounds %CXXExceptionRegistration, %CXXExceptionRegistration* %0, i32 0, i32 1
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%22 = getelementptr inbounds %EHRegistrationNode, %EHRegistrationNode* %21, i32 0, i32 0
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%23 = load %EHRegistrationNode*, %EHRegistrationNode** %22, align 4
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store %EHRegistrationNode* %23, %EHRegistrationNode* addrspace(257)* null, align 4
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ret i32 0
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}
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; Function Attrs: argmemonly nofree nosync nounwind willreturn
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #2
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; Function Attrs: nofree
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declare dso_local i32 @__CxxFrameHandler3(...) #3
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; Function Attrs: argmemonly nofree nosync nounwind willreturn
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #2
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; Function Attrs: nofree
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declare dso_local x86_stdcallcc void @_CxxThrowException(i8*, %eh.ThrowInfo*) local_unnamed_addr #3
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declare i32 @_setjmp3(i8*, i32, ...)
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; Function Attrs: nofree nosync nounwind willreturn
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declare i8* @llvm.stacksave() #4
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define internal i32 @"__ehhandler$main"(i8* %0, i8* %1, i8* %2, i8* %3) #5 {
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entry:
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%4 = call i8* @llvm.x86.seh.lsda(i8* bitcast (i32 ()* @main to i8*))
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%5 = tail call i32 bitcast (i32 (...)* @__CxxFrameHandler3 to i32 (i8*, i8*, i8*, i8*, i8*)*)(i8* inreg %4, i8* %0, i8* %1, i8* %2, i8* %3)
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ret i32 %5
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}
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; Function Attrs: nounwind readnone
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declare i8* @llvm.x86.seh.lsda(i8*) #6
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declare x86_stdcallcc void @__CxxLongjmpUnwind(i8*)
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; Function Attrs: nounwind
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declare void @llvm.x86.seh.ehregnode(i8*) #7
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attributes #0 = { noinline nounwind sspstrong "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="none" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { norecurse sspstrong "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="none" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { argmemonly nofree nosync nounwind willreturn }
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attributes #3 = { nofree }
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attributes #4 = { nofree nosync nounwind willreturn }
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attributes #5 = { "safeseh" }
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attributes #6 = { nounwind readnone }
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attributes #7 = { nounwind }
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attributes #8 = { noreturn }
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!llvm.linker.options = !{!0, !1, !2}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = !{!"/DEFAULTLIB:libcmt.lib"}
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!1 = !{!"/DEFAULTLIB:libmmt.lib"}
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!2 = !{!"/DEFAULTLIB:oldnames.lib"}
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!3 = !{i32 1, !"NumRegisterParameters", i32 0}
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!4 = !{i32 1, !"wchar_size", i32 2}
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!5 = !{!"Intel(R) oneAPI DPC++ Compiler Pro 2021.1 (YYYY.x.0.MMDD)"}
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...
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---
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name: 'escape__YAXPAH@Z'
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alignment: 16
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers: []
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liveins: []
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 4
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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maxCallFrameSize: 4294967295
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack:
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- { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
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isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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stack: []
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callSites: []
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debugValueSubstitutions: []
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constants: []
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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RET 0
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...
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---
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name: main
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alignment: 16
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers:
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- { id: 0, class: gr32, preferred-register: '' }
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- { id: 1, class: gr32, preferred-register: '' }
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- { id: 2, class: gr32, preferred-register: '' }
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- { id: 3, class: gr32, preferred-register: '' }
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- { id: 4, class: gr32, preferred-register: '' }
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- { id: 5, class: gr32, preferred-register: '' }
|
||||
- { id: 6, class: gr32, preferred-register: '' }
|
||||
- { id: 7, class: gr32, preferred-register: '' }
|
||||
- { id: 8, class: gr32, preferred-register: '' }
|
||||
- { id: 9, class: gr32, preferred-register: '' }
|
||||
- { id: 10, class: gr32, preferred-register: '' }
|
||||
liveins: []
|
||||
frameInfo:
|
||||
isFrameAddressTaken: false
|
||||
isReturnAddressTaken: false
|
||||
hasStackMap: false
|
||||
hasPatchPoint: false
|
||||
stackSize: 0
|
||||
offsetAdjustment: 0
|
||||
maxAlignment: 4
|
||||
adjustsStack: false
|
||||
hasCalls: true
|
||||
stackProtector: ''
|
||||
maxCallFrameSize: 4294967295
|
||||
cvBytesOfCalleeSavedRegisters: 0
|
||||
hasOpaqueSPAdjustment: true
|
||||
hasVAStart: false
|
||||
hasMustTailInVarArgFunc: false
|
||||
localFrameSize: 0
|
||||
savePoint: ''
|
||||
restorePoint: ''
|
||||
fixedStack: []
|
||||
stack:
|
||||
- { id: 0, name: zx, type: default, offset: 0, size: 16, alignment: 4,
|
||||
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
|
||||
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
|
||||
- { id: 1, name: tmp.i.i, type: default, offset: 0, size: 4, alignment: 4,
|
||||
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
|
||||
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
|
||||
- { id: 2, name: o.i, type: default, offset: 0, size: 4, alignment: 4,
|
||||
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
|
||||
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
|
||||
- { id: 3, name: exp.i, type: default, offset: 0, size: 4, alignment: 4,
|
||||
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
|
||||
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
|
||||
callSites: []
|
||||
debugValueSubstitutions: []
|
||||
constants: []
|
||||
machineFunctionInfo: {}
|
||||
body: |
|
||||
bb.0.entry:
|
||||
successors: %bb.1(0x7ffff800), %bb.2(0x00000800)
|
||||
|
||||
%0:gr32 = COPY $esp
|
||||
MOV32mr %stack.0.zx, 1, $noreg, 0, $noreg, %0 :: (store 4 into %ir.3)
|
||||
MOV32mi %stack.0.zx, 1, $noreg, 12, $noreg, -1 :: (store 4 into %ir.4)
|
||||
%1:gr32 = nuw LEA32r %stack.0.zx, 1, $noreg, 4, $noreg
|
||||
MOV32mi %stack.0.zx, 1, $noreg, 8, $noreg, @"__ehhandler$main" :: (store 4 into %ir.6)
|
||||
%2:gr32 = MOV32rm $noreg, 1, $noreg, 0, $fs :: (load 4 from `%EHRegistrationNode* addrspace(257)* null`, addrspace 257)
|
||||
MOV32mr %stack.0.zx, 1, $noreg, 4, $noreg, killed %2 :: (store 4 into %ir.8)
|
||||
MOV32mr $noreg, 1, $noreg, 0, $fs, killed %1 :: (store 4 into `%EHRegistrationNode* addrspace(257)* null`, addrspace 257)
|
||||
MOV32mi %stack.2.o.i, 1, $noreg, 0, $noreg, 1 :: (store 4 into %ir.i.i.i1)
|
||||
MOV32mi %stack.1.tmp.i.i, 1, $noreg, 0, $noreg, 999 :: (store 4 into %ir.tmp.i.i)
|
||||
MOV32mi %stack.0.zx, 1, $noreg, 12, $noreg, 1 :: (store 4 into %ir.12)
|
||||
ADJCALLSTACKDOWN32 8, 0, 0, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp
|
||||
%3:gr32 = COPY $esp
|
||||
%4:gr32 = LEA32r %stack.1.tmp.i.i, 1, $noreg, 0, $noreg
|
||||
MOV32mr %3, 1, $noreg, 0, $noreg, killed %4 :: (store 4 into stack)
|
||||
MOV32mi %3, 1, $noreg, 4, $noreg, @_TI1H :: (store 4 into stack + 4)
|
||||
CALLpcrel32 @_CxxThrowException, csr_noregs, implicit $esp, implicit $ssp, implicit-def $esp, implicit-def $ssp
|
||||
ADJCALLSTACKUP32 8, 0, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp
|
||||
JMP_1 %bb.1
|
||||
|
||||
bb.1..noexc.i:
|
||||
successors:
|
||||
|
||||
|
||||
bb.2.ehcleanup.i (landing-pad, ehfunclet-entry):
|
||||
successors: %bb.3(0x80000000)
|
||||
|
||||
MOV32mi %stack.2.o.i, 1, $noreg, 0, $noreg, 9999 :: (store 4 into %ir.14)
|
||||
ADJCALLSTACKDOWN32 4, 0, 0, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp
|
||||
%5:gr32 = COPY $esp
|
||||
%6:gr32 = LEA32r %stack.2.o.i, 1, $noreg, 0, $noreg
|
||||
MOV32mr %5, 1, $noreg, 0, $noreg, killed %6 :: (store 4 into stack)
|
||||
CALLpcrel32 @"escape__YAXPAH@Z", csr_32, implicit $esp, implicit $ssp, implicit-def $esp, implicit-def $ssp
|
||||
ADJCALLSTACKUP32 4, 0, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp
|
||||
CLEANUPRET
|
||||
|
||||
bb.3.catch.i (landing-pad, ehfunclet-entry):
|
||||
successors: %bb.4(0x80000000)
|
||||
|
||||
%7:gr32 = MOV32rm %stack.3.exp.i, 1, $noreg, 0, $noreg :: (dereferenceable load 4 from %ir.exp.i)
|
||||
%8:gr32 = MOV32rm killed %7, 1, $noreg, 0, $noreg :: (load 4 from %ir.18)
|
||||
MOV32mr $noreg, 1, $noreg, @v__3HC, $noreg, killed %8 :: (volatile store release 4 into @v__3HC)
|
||||
CATCHRET %bb.4, %bb.0
|
||||
|
||||
bb.4.catch.i (landing-pad):
|
||||
successors: %bb.5(0x80000000)
|
||||
|
||||
JMP_4 %bb.5
|
||||
|
||||
bb.5.func__YAXXZ.exit:
|
||||
%9:gr32 = MOV32rm %stack.0.zx, 1, $noreg, 4, $noreg :: (dereferenceable load 4 from %ir.22)
|
||||
MOV32mr $noreg, 1, $noreg, 0, $fs, killed %9 :: (store 4 into `%EHRegistrationNode* addrspace(257)* null`, addrspace 257)
|
||||
%10:gr32 = MOV32r0 implicit-def dead $eflags
|
||||
$eax = COPY %10
|
||||
RET 0, $eax
|
||||
|
||||
...
|
||||
---
|
||||
name: '__ehhandler$main'
|
||||
alignment: 16
|
||||
exposesReturnsTwice: false
|
||||
legalized: false
|
||||
regBankSelected: false
|
||||
selected: false
|
||||
failedISel: false
|
||||
tracksRegLiveness: true
|
||||
hasWinCFI: false
|
||||
registers:
|
||||
- { id: 0, class: gr32, preferred-register: '' }
|
||||
liveins: []
|
||||
frameInfo:
|
||||
isFrameAddressTaken: false
|
||||
isReturnAddressTaken: false
|
||||
hasStackMap: false
|
||||
hasPatchPoint: false
|
||||
stackSize: 0
|
||||
offsetAdjustment: 0
|
||||
maxAlignment: 4
|
||||
adjustsStack: false
|
||||
hasCalls: false
|
||||
stackProtector: ''
|
||||
maxCallFrameSize: 4294967295
|
||||
cvBytesOfCalleeSavedRegisters: 0
|
||||
hasOpaqueSPAdjustment: false
|
||||
hasVAStart: false
|
||||
hasMustTailInVarArgFunc: false
|
||||
localFrameSize: 0
|
||||
savePoint: ''
|
||||
restorePoint: ''
|
||||
fixedStack:
|
||||
- { id: 0, type: default, offset: 0, size: 4, alignment: 4, stack-id: default,
|
||||
isImmutable: false, isAliased: false, callee-saved-register: '',
|
||||
callee-saved-restored: true, debug-info-variable: '', debug-info-expression: '',
|
||||
debug-info-location: '' }
|
||||
- { id: 1, type: default, offset: 4, size: 4, alignment: 4, stack-id: default,
|
||||
isImmutable: false, isAliased: false, callee-saved-register: '',
|
||||
callee-saved-restored: true, debug-info-variable: '', debug-info-expression: '',
|
||||
debug-info-location: '' }
|
||||
- { id: 2, type: default, offset: 8, size: 4, alignment: 4, stack-id: default,
|
||||
isImmutable: false, isAliased: false, callee-saved-register: '',
|
||||
callee-saved-restored: true, debug-info-variable: '', debug-info-expression: '',
|
||||
debug-info-location: '' }
|
||||
- { id: 3, type: default, offset: 12, size: 4, alignment: 4, stack-id: default,
|
||||
isImmutable: false, isAliased: false, callee-saved-register: '',
|
||||
callee-saved-restored: true, debug-info-variable: '', debug-info-expression: '',
|
||||
debug-info-location: '' }
|
||||
stack: []
|
||||
callSites: []
|
||||
debugValueSubstitutions: []
|
||||
constants: []
|
||||
machineFunctionInfo: {}
|
||||
body: |
|
||||
bb.0.entry:
|
||||
%0:gr32 = MOV32ri <mcsymbol L__ehtable$main>
|
||||
$eax = COPY %0
|
||||
TCRETURNdi @__CxxFrameHandler3, 0, csr_32, implicit $esp, implicit $ssp, implicit $eax
|
||||
|
||||
...
|
||||
Loading…
Reference in New Issue