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Disable FP elimination in funcs using 32-bit MSVC EH personalities

Browse Source 
The value in 'ebp' acts as an implicit argument to the outlined
handlers, and is recovered with frameaddress(1).

llvm-svn: 238619
This commit is contained in:
Reid Kleckner 2015-05-29 21:58:11 +00:00
parent 27d0b57917
commit 44a9f03b05
3 changed files with 34 additions and 23 deletions
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5
lib/Target/X86/X86WinEHState.cpp
View File

@ -155,6 +155,11 @@ bool WinEHStatePass::runOnFunction(Function &F) {
if (!isMSVCEHPersonality(Personality))
return false;
// Disable frame pointer elimination in this function.
// FIXME: Do the nested handlers need to keep the parent ebp in ebp, or can we
// use an arbitrary register?
F.addFnAttr("no-frame-pointer-elim", "true");
emitExceptionRegistrationRecord(&F);
auto *MMIPtr = getAnalysisIfAvailable<MachineModuleInfo>();

6
test/CodeGen/X86/win32-eh-states.ll
View File

@ -90,14 +90,14 @@ eh.resume: ; preds = %catch.dispatch.4
}
; CHECK-LABEL: _f:
; CHECK: movl $-1, [[state:[0-9]+]](%esp)
; CHECK: movl $-1, [[state:[-0-9]+]](%ebp)
; CHECK: movl $___ehhandler$f, {{.*}}
;
; CHECK: movl $0, [[state]](%esp)
; CHECK: movl $0, [[state]](%ebp)
; CHECK: movl $1, (%esp)
; CHECK: calll _may_throw
;
; CHECK: movl $1, [[state]](%esp)
; CHECK: movl $1, [[state]](%ebp)
; CHECK: movl $2, (%esp)
; CHECK: calll _may_throw

46
test/CodeGen/X86/win32-eh.ll
View File

@ -19,16 +19,18 @@ catchall:
}
; CHECK-LABEL: _use_except_handler3:
; CHECK: pushl %ebp
; CHECK: movl %esp, %ebp
; CHECK: subl ${{[0-9]+}}, %esp
; CHECK: movl $-1, 12(%esp)
; CHECK: movl $L__ehtable$use_except_handler3, 8(%esp)
; CHECK: movl $__except_handler3, 4(%esp)
; CHECK: movl $-1, -4(%ebp)
; CHECK: movl $L__ehtable$use_except_handler3, -8(%ebp)
; CHECK: movl $__except_handler3, -12(%ebp)
; CHECK: movl %fs:0, %[[next:[^ ,]*]]
; CHECK: movl %[[next]], (%esp)
; CHECK: leal (%esp), %[[node:[^ ,]*]]
; CHECK: movl %[[next]], -16(%ebp)
; CHECK: leal -16(%ebp), %[[node:[^ ,]*]]
; CHECK: movl %[[node]], %fs:0
; CHECK: calll _may_throw_or_crash
; CHECK: movl (%esp), %[[next:[^ ,]*]]
; CHECK: movl -16(%ebp), %[[next:[^ ,]*]]
; CHECK: movl %[[next]], %fs:0
; CHECK: retl
@ -44,17 +46,19 @@ catchall:
}
; CHECK-LABEL: _use_except_handler4:
; CHECK: pushl %ebp
; CHECK: movl %esp, %ebp
; CHECK: subl ${{[0-9]+}}, %esp
; CHECK: movl %esp, (%esp)
; CHECK: movl $-1, 20(%esp)
; CHECK: movl $L__ehtable$use_except_handler4, 4(%esp)
; CHECK: leal 8(%esp), %[[node:[^ ,]*]]
; CHECK: movl $__except_handler4, 12(%esp)
; CHECK: movl %esp, -24(%ebp)
; CHECK: movl $-1, -4(%ebp)
; CHECK: movl $L__ehtable$use_except_handler4, -20(%ebp)
; CHECK: leal -16(%ebp), %[[node:[^ ,]*]]
; CHECK: movl $__except_handler4, -12(%ebp)
; CHECK: movl %fs:0, %[[next:[^ ,]*]]
; CHECK: movl %[[next]], 8(%esp)
; CHECK: movl %[[next]], -16(%ebp)
; CHECK: movl %[[node]], %fs:0
; CHECK: calll _may_throw_or_crash
; CHECK: movl 8(%esp), %[[next:[^ ,]*]]
; CHECK: movl -16(%ebp), %[[next:[^ ,]*]]
; CHECK: movl %[[next]], %fs:0
; CHECK: retl
@ -73,17 +77,19 @@ catchall:
}
; CHECK-LABEL: _use_CxxFrameHandler3:
; CHECK: pushl %ebp
; CHECK: movl %esp, %ebp
; CHECK: subl ${{[0-9]+}}, %esp
; CHECK: movl %esp, (%esp)
; CHECK: movl $-1, 12(%esp)
; CHECK: leal 4(%esp), %[[node:[^ ,]*]]
; CHECK: movl $___ehhandler$use_CxxFrameHandler3, 8(%esp)
; CHECK: movl %esp, -16(%ebp)
; CHECK: movl $-1, -4(%ebp)
; CHECK: leal -12(%ebp), %[[node:[^ ,]*]]
; CHECK: movl $___ehhandler$use_CxxFrameHandler3, -8(%ebp)
; CHECK: movl %fs:0, %[[next:[^ ,]*]]
; CHECK: movl %[[next]], 4(%esp)
; CHECK: movl %[[next]], -12(%ebp)
; CHECK: movl %[[node]], %fs:0
; CHECK: movl $0, 12(%esp)
; CHECK: movl $0, -4(%ebp)
; CHECK: calll _may_throw_or_crash
; CHECK: movl 4(%esp), %[[next:[^ ,]*]]
; CHECK: movl -12(%ebp), %[[next:[^ ,]*]]
; CHECK: movl %[[next]], %fs:0
; CHECK: retl