[SEH] Add 32-bit lowering code for __try

This is just the clang-side of 32-bit SEH. LLVM still needs work, and it
will determinstically fail to compile until it's feature complete.

On x86, all outlined handlers have no parameters, but they do implicitly
take the EBP value passed in and use it to address locals of the parent
frame. We model this with llvm.frameaddress(1).

This works (mostly), but __finally block inlining can break it. For now,
we apply the 'noinline' attribute. If we really want to inline __finally
blocks on 32-bit x86, we should teach the inliner how to untangle
frameescape and framerecover.

Promote the error diagnostic from codegen to sema. It now rejects SEH on
non-Windows platforms. LLVM doesn't implement SEH on non-x86 Windows
platforms, but there's nothing preventing it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@236052 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 49 insertions, 44 deletions

diff --git a/test/CodeGen/exceptions-seh-finally.c b/test/CodeGen/exceptions-seh-finally.c
index 345d514611..6366c35039 100644
--- a/test/CodeGen/exceptions-seh-finally.c
+++ b/test/CodeGen/exceptions-seh-finally.c
@@ -1,4 +1,7 @@
-// RUN: %clang_cc1 %s -triple x86_64-pc-win32 -fms-extensions -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -triple x86_64-pc-win32 -fms-extensions -emit-llvm -o - \
+// RUN:         | FileCheck %s --check-prefix=CHECK --check-prefix=X64
+// RUN: %clang_cc1 %s -triple i686-pc-win32 -fms-extensions -emit-llvm -o - \
+// RUN:         | FileCheck %s --check-prefix=CHECK --check-prefix=X86
 
 void abort(void) __attribute__((noreturn));
 void might_crash(void);
@@ -17,18 +20,20 @@ void basic_finally(void) {
 // CHECK:     to label %[[invoke_cont:[^ ]*]] unwind label %[[lpad:[^ ]*]]
 //
 // CHECK: [[invoke_cont]]
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@basic_finally@@"(i8 0, i8* %[[fp]])
+// X64: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
+// X64: call void @"\01?fin$0@0@basic_finally@@"(i8 0, i8* %[[fp]])
+// X86: call void @"\01?fin$0@0@basic_finally@@"()
 // CHECK-NEXT: ret void
 //
 // CHECK: [[lpad]]
 // CHECK-NEXT: landingpad
 // CHECK-NEXT: cleanup
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@basic_finally@@"(i8 1, i8* %[[fp]])
+// X64: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
+// X64: call void @"\01?fin$0@0@basic_finally@@"(i8 1, i8* %[[fp]])
+// X86: call void @"\01?fin$0@0@basic_finally@@"()
 // CHECK: resume { i8*, i32 }
 
-// CHECK: define internal void @"\01?fin$0@0@basic_finally@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK: define internal void @"\01?fin$0@0@basic_finally@@"({{.*}})
 // CHECK: call void @cleanup()
 
 // Mostly check that we don't double emit 'r' which would crash.
@@ -57,11 +62,12 @@ l:
 // CHECK:     to label %[[invoke_cont:[^ ]*]] unwind label %[[lpad:[^ ]*]]
 //
 // CHECK: [[invoke_cont]]
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@label_in_finally@@"(i8 0, i8* %[[fp]])
+// X64: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
+// X64: call void @"\01?fin$0@0@label_in_finally@@"(i8 0, i8* %[[fp]])
+// X86: call void @"\01?fin$0@0@label_in_finally@@"()
 // CHECK: ret void
 
-// CHECK: define internal void @"\01?fin$0@0@label_in_finally@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK: define internal void @"\01?fin$0@0@label_in_finally@@"({{.*}})
 // CHECK: br label %[[l:[^ ]*]]
 //
 // CHECK: [[l]]
@@ -80,23 +86,33 @@ void use_abnormal_termination(void) {
 }
 
 // CHECK-LABEL: define void @use_abnormal_termination()
+// X86: call void (...) @llvm.frameescape(i32* %[[abnormal_termination:[^ ),]*]])
+// X86: store i32 1, i32* %[[abnormal_termination]]
 // CHECK: invoke void @might_crash()
 // CHECK:     to label %[[invoke_cont:[^ ]*]] unwind label %[[lpad:[^ ]*]]
 //
 // CHECK: [[invoke_cont]]
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@use_abnormal_termination@@"(i8 0, i8* %[[fp]])
+// X64: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
+// X64: call void @"\01?fin$0@0@use_abnormal_termination@@"(i8 0, i8* %[[fp]])
+// X86: store i32 0, i32* %[[abnormal_termination]]
+// X86: call void @"\01?fin$0@0@use_abnormal_termination@@"()
 // CHECK: ret void
 //
 // CHECK: [[lpad]]
 // CHECK-NEXT: landingpad
 // CHECK-NEXT: cleanup
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@use_abnormal_termination@@"(i8 1, i8* %[[fp]])
+// X64: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
+// X64: call void @"\01?fin$0@0@use_abnormal_termination@@"(i8 1, i8* %[[fp]])
+// X86: call void @"\01?fin$0@0@use_abnormal_termination@@"()
 // CHECK: resume { i8*, i32 }
 
-// CHECK: define internal void @"\01?fin$0@0@use_abnormal_termination@@"(i8 %abnormal_termination, i8* %frame_pointer)
-// CHECK: %[[abnormal_zext:[^ ]*]] = zext i8 %abnormal_termination to i32
+// X64: define internal void @"\01?fin$0@0@use_abnormal_termination@@"(i8 %[[abnormal:abnormal_termination]], i8* %frame_pointer)
+// X64: %[[abnormal_zext:[^ ]*]] = zext i8 %[[abnormal]] to i32
+// X86: define internal void @"\01?fin$0@0@use_abnormal_termination@@"()
+// X86: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 1)
+// X86: %[[abnormal_i8:[^ ]*]] = call i8* @llvm.framerecover(i8* bitcast (void ()* @use_abnormal_termination to i8*), i8* %[[fp]], i32 0)
+// X86: %[[abnormal:[^ ]*]] = bitcast i8* %[[abnormal_i8]] to i32*
+// X86: %[[abnormal_zext:[^ ]*]] = load i32, i32* %[[abnormal]]
 // CHECK: store i32 %[[abnormal_zext]], i32* @crashed
 // CHECK-NEXT: ret void
 
@@ -109,11 +125,10 @@ void noreturn_noop_finally() {
 }
 
 // CHECK-LABEL: define void @noreturn_noop_finally()
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@noreturn_noop_finally@@"(i8 0, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@noreturn_noop_finally@@"({{.*}})
 // CHECK: ret void
 
-// CHECK: define internal void @"\01?fin$0@0@noreturn_noop_finally@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK: define internal void @"\01?fin$0@0@noreturn_noop_finally@@"({{.*}})
 // CHECK: call void @abort()
 // CHECK: unreachable
 
@@ -130,18 +145,16 @@ void noreturn_finally() {
 // CHECK:     to label %[[cont:[^ ]*]] unwind label %[[lpad:[^ ]*]]
 //
 // CHECK: [[cont]]
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@noreturn_finally@@"(i8 0, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@noreturn_finally@@"({{.*}})
 // CHECK: ret void
 //
 // CHECK: [[lpad]]
 // CHECK: landingpad
 // CHECK-NEXT: cleanup
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@noreturn_finally@@"(i8 1, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@noreturn_finally@@"({{.*}})
 // CHECK: resume { i8*, i32 }
 
-// CHECK: define internal void @"\01?fin$0@0@noreturn_finally@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK: define internal void @"\01?fin$0@0@noreturn_finally@@"({{.*}})
 // CHECK: call void @abort()
 // CHECK: unreachable
 
@@ -152,11 +165,10 @@ int finally_with_return() {
   }
 }
 // CHECK-LABEL: define i32 @finally_with_return()
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK-NEXT: call void @"\01?fin$0@0@finally_with_return@@"(i8 0, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@finally_with_return@@"({{.*}})
 // CHECK-NEXT: ret i32 42
 
-// CHECK: define internal void @"\01?fin$0@0@finally_with_return@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK: define internal void @"\01?fin$0@0@finally_with_return@@"({{.*}})
 // CHECK-NOT: br i1
 // CHECK-NOT: br label
 // CHECK: ret void
@@ -174,25 +186,22 @@ int nested___finally___finally() {
 }
 
 // CHECK-LABEL: define i32 @nested___finally___finally
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: invoke void @"\01?fin$1@0@nested___finally___finally@@"(i8 0, i8* %[[fp]])
+// CHECK: invoke void @"\01?fin$1@0@nested___finally___finally@@"({{.*}})
 // CHECK:          to label %[[outercont:[^ ]*]] unwind label %[[lpad:[^ ]*]]
 //
 // CHECK: [[outercont]]
-// CHECK-NEXT: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK-NEXT: call void @"\01?fin$0@0@nested___finally___finally@@"(i8 0, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@nested___finally___finally@@"({{.*}})
 // CHECK-NEXT: ret i32 0
 //
 // CHECK: [[lpad]]
 // CHECK-NEXT: landingpad
 // CHECK-NEXT: cleanup
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK-NEXT: call void @"\01?fin$0@0@nested___finally___finally@@"(i8 1, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@nested___finally___finally@@"({{.*}})
 
-// CHECK-LABEL: define internal void @"\01?fin$0@0@nested___finally___finally@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK-LABEL: define internal void @"\01?fin$0@0@nested___finally___finally@@"({{.*}})
 // CHECK: ret void
 
-// CHECK-LABEL: define internal void @"\01?fin$1@0@nested___finally___finally@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK-LABEL: define internal void @"\01?fin$1@0@nested___finally___finally@@"({{.*}})
 // CHECK: unreachable
 
 int nested___finally___finally_with_eh_edge() {
@@ -212,31 +221,27 @@ int nested___finally___finally_with_eh_edge() {
 // CHECK-NEXT: to label %[[invokecont:[^ ]*]] unwind label %[[lpad1:[^ ]*]]
 //
 // [[invokecont]]
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: invoke void @"\01?fin$1@0@nested___finally___finally_with_eh_edge@@"(i8 0, i8* %[[fp]])
+// CHECK: invoke void @"\01?fin$1@0@nested___finally___finally_with_eh_edge@@"({{.*}})
 // CHECK:          to label %[[outercont:[^ ]*]] unwind label %[[lpad2:[^ ]*]]
 //
 // CHECK: [[outercont]]
-// CHECK-NEXT: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK-NEXT: call void @"\01?fin$0@0@nested___finally___finally_with_eh_edge@@"(i8 0, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@nested___finally___finally_with_eh_edge@@"({{.*}})
 // CHECK-NEXT: ret i32 912
 //
 // CHECK: [[lpad1]]
 // CHECK-NEXT: landingpad
 // CHECK-NEXT: cleanup
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: invoke void @"\01?fin$1@0@nested___finally___finally_with_eh_edge@@"(i8 1, i8* %[[fp]])
+// CHECK: invoke void @"\01?fin$1@0@nested___finally___finally_with_eh_edge@@"({{.*}})
 // CHECK:          to label %[[outercont:[^ ]*]] unwind label %[[lpad2]]
 //
 // CHECK: [[lpad2]]
 // CHECK-NEXT: landingpad
 // CHECK-NEXT: cleanup
-// CHECK: %[[fp:[^ ]*]] = call i8* @llvm.frameaddress(i32 0)
-// CHECK: call void @"\01?fin$0@0@nested___finally___finally_with_eh_edge@@"(i8 1, i8* %[[fp]])
+// CHECK: call void @"\01?fin$0@0@nested___finally___finally_with_eh_edge@@"({{.*}})
 // CHECK: resume
 
-// CHECK-LABEL: define internal void @"\01?fin$0@0@nested___finally___finally_with_eh_edge@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK-LABEL: define internal void @"\01?fin$0@0@nested___finally___finally_with_eh_edge@@"({{.*}})
 // CHECK: ret void
 
-// CHECK-LABEL: define internal void @"\01?fin$1@0@nested___finally___finally_with_eh_edge@@"(i8 %abnormal_termination, i8* %frame_pointer)
+// CHECK-LABEL: define internal void @"\01?fin$1@0@nested___finally___finally_with_eh_edge@@"({{.*}})
 // CHECK: unreachable