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Tidying up some code and comments. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84894 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-10-22 20:48:59 +00:00
parent a84c9db467
commit 48dc29ef91
1 changed files with 6 additions and 24 deletions
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30
lib/CodeGen/AsmPrinter/DwarfException.cpp
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@ -871,28 +871,7 @@ void DwarfException::EmitExceptionTable() {
Asm->EOL("Next action"); Asm->EOL("Next action");
} }
// Emit the Catch Clauses. The code for the catch clauses following the same // Emit the Catch TypeInfos.
// try is similar to a switch statement. The catch clause action record
// informs the runtime about the type of a catch clause and about the
// associated switch value.
//
// Action Record Fields:
//
// * Filter Value
// Positive value, starting at 1. Index in the types table of the
// __typeinfo for the catch-clause type. 1 is the first word preceding
// TTBase, 2 is the second word, and so on. Used by the runtime to check
// if the thrown exception type matches the catch-clause type. Back-end
// generated switch statements check against this value.
//
// * Next
// Signed offset, in bytes from the start of this field, to the next
// chained action record, or zero if none.
//
// The order of the action records determined by the next field is the order
// of the catch clauses as they appear in the source code, and must be kept in
// the same order. As a result, changing the order of the catch clause would
// change the semantics of the program.
for (std::vector<GlobalVariable *>::const_reverse_iterator for (std::vector<GlobalVariable *>::const_reverse_iterator
I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) { I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
const GlobalVariable *GV = *I; const GlobalVariable *GV = *I;
@ -907,12 +886,15 @@ void DwarfException::EmitExceptionTable() {
Asm->EOL("TypeInfo"); Asm->EOL("TypeInfo");
} }
// Emit the Type Table. // Emit the Exception Specifications.
for (std::vector<unsigned>::const_iterator for (std::vector<unsigned>::const_iterator
I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) { I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
unsigned TypeID = *I; unsigned TypeID = *I;
Asm->EmitULEB128Bytes(TypeID); Asm->EmitULEB128Bytes(TypeID);
Asm->EOL("Filter TypeInfo index"); if (TypeID != 0)
Asm->EOL("Exception specification");
else
Asm->EOL();
} }
Asm->EmitAlignment(2, 0, 0, false); Asm->EmitAlignment(2, 0, 0, false);