diff options
| author | Duncan Sands <baldrick@free.fr> | 2012-01-13 19:59:16 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2012-01-13 19:59:16 +0000 |
| commit | 8d6796b796771fcff70cfc3a21f4c05b256cdd85 (patch) | |
| tree | c6e716a3c1969900674fd7692055c5d6ff691ed7 /docs/LangRef.html | |
| parent | 85d5aaecd03ca4bc6e406ee88c72a4ba8878bb2b (diff) | |
Try to clarify a little how exception handling works.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148136 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/LangRef.html')
| -rw-r--r-- | docs/LangRef.html | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index 2799083748..1172b7cb93 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -6179,8 +6179,8 @@ freestanding environments and non-C-based languages.</p> <h5>Syntax:</h5> <pre> - <resultval> = landingpad <somety> personality <type> <pers_fn> <clause>+ - <resultval> = landingpad <somety> personality <type> <pers_fn> cleanup <clause>* + <resultval> = landingpad <resultty> personality <type> <pers_fn> <clause>+ + <resultval> = landingpad <resultty> personality <type> <pers_fn> cleanup <clause>* <clause> := catch <type> <value> <clause> := filter <array constant type> <array constant> @@ -6194,7 +6194,7 @@ freestanding environments and non-C-based languages.</p> <i><tt>catch</tt></i> portion of a <i><tt>try/catch</tt></i> sequence. It defines values supplied by the personality function (<tt>pers_fn</tt>) upon re-entry to the function. The <tt>resultval</tt> has the - type <tt>somety</tt>.</p> + type <tt>resultty</tt>.</p> <h5>Arguments:</h5> <p>This instruction takes a <tt>pers_fn</tt> value. This is the personality @@ -6218,7 +6218,11 @@ freestanding environments and non-C-based languages.</p> <p>The clauses are applied in order from top to bottom. If two <tt>landingpad</tt> instructions are merged together through inlining, the - clauses from the calling function are appended to the list of clauses.</p> + clauses from the calling function are appended to the list of clauses. + When the call stack is being unwound due to an exception being thrown, the + exception is compared against each <tt>clause</tt> in turn. If it doesn't + match any of the clauses, and the <tt>cleanup</tt> flag is not set, then + unwinding continues further up the call stack.</p> <p>The <tt>landingpad</tt> instruction has several restrictions:</p> |