699670e764
This makes -Wunreachable-code work for programs containing SEH (except for __finally, which is still missing for now). __try is modeled like try (but simpler since it can only have a single __except or __finally), __except is fairly similar to catch (but simpler, since it can't contain declarations). __leave is implemented similarly to break / continue. Use the existing addTryDispatchBlock infrastructure (which FindUnreachableCode() in ReachableCode.cpp uses via cfg->try_blocks_begin()) to mark things in the __except blocks as reachable. Re-use TryTerminatedBlock. This means we add EH edges from calls to the __try block, but not from all other statements. While this is incomplete, it matches LLVM's SEH codegen support. Also, in practice, BuildOpts.AddEHEdges is always false in practice from what I can tell, so we never even insert the call EH edges either. https://reviews.llvm.org/D36914 llvm-svn: 311561
56 lines
919 B
C
56 lines
919 B
C
// RUN: %clang_cc1 %s -triple=i686-pc-win32 -fsyntax-only -verify -fms-extensions -Wunreachable-code
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void f();
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void g1() {
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__try {
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f();
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__leave;
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f(); // expected-warning{{will never be executed}}
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} __except(1) {
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f();
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}
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// Completely empty.
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__try {
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} __except(1) {
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}
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__try {
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f();
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return;
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} __except(1) { // Filter expression should not be marked as unreachable.
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// Empty __except body.
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}
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}
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void g2() {
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__try {
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// Nested __try.
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__try {
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f();
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__leave;
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f(); // expected-warning{{will never be executed}}
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} __except(2) {
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}
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f();
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__leave;
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f(); // expected-warning{{will never be executed}}
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} __except(1) {
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f();
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}
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}
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void g3() {
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__try {
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__try {
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f();
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} __except (1) {
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__leave; // should exit outer try
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}
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__leave;
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f(); // expected-warning{{never be executed}}
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} __except (1) {
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}
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}
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