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Move comment to above method.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77412 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-07-29 00:50:05 +00:00
parent eff2ab61b5
commit 0dafca9076
1 changed files with 21 additions and 21 deletions
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42
lib/CodeGen/AsmPrinter/DwarfException.cpp
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@ -235,27 +235,6 @@ void DwarfException::EmitEHFrame(const FunctionEHFrameInfo &EHFrameInfo) {
} }
} }
/// EmitExceptionTable - Emit landing pads and actions.
///
/// The general organization of the table is complex, but the basic concepts are
/// easy. First there is a header which describes the location and organization
/// of the three components that follow.
///
/// 1. The landing pad site information describes the range of code covered by
/// the try. In our case it's an accumulation of the ranges covered by the
/// invokes in the try. There is also a reference to the landing pad that
/// handles the exception once processed. Finally an index into the actions
/// table.
/// 2. The action table, in our case, is composed of pairs of type ids and next
/// action offset. Starting with the action index from the landing pad
/// site, each type Id is checked for a match to the current exception. If
/// it matches then the exception and type id are passed on to the landing
/// pad. Otherwise the next action is looked up. This chain is terminated
/// with a next action of zero. If no type id is found the the frame is
/// unwound and handling continues.
/// 3. Type id table contains references to all the C++ typeinfo for all
/// catches in the function. This tables is reversed indexed base 1.
/// SharedTypeIds - How many leading type ids two landing pads have in common. /// SharedTypeIds - How many leading type ids two landing pads have in common.
unsigned DwarfException::SharedTypeIds(const LandingPadInfo *L, unsigned DwarfException::SharedTypeIds(const LandingPadInfo *L,
const LandingPadInfo *R) { const LandingPadInfo *R) {
@ -470,6 +449,26 @@ ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
} }
} }
/// EmitExceptionTable - Emit landing pads and actions.
///
/// The general organization of the table is complex, but the basic concepts are
/// easy. First there is a header which describes the location and organization
/// of the three components that follow.
///
/// 1. The landing pad site information describes the range of code covered by
/// the try. In our case it's an accumulation of the ranges covered by the
/// invokes in the try. There is also a reference to the landing pad that
/// handles the exception once processed. Finally an index into the actions
/// table.
/// 2. The action table, in our case, is composed of pairs of type ids and next
/// action offset. Starting with the action index from the landing pad
/// site, each type Id is checked for a match to the current exception. If
/// it matches then the exception and type id are passed on to the landing
/// pad. Otherwise the next action is looked up. This chain is terminated
/// with a next action of zero. If no type id is found the the frame is
/// unwound and handling continues.
/// 3. Type id table contains references to all the C++ typeinfo for all
/// catches in the function. This tables is reversed indexed base 1.
void DwarfException::EmitExceptionTable() { void DwarfException::EmitExceptionTable() {
const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos(); const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
const std::vector<unsigned> &FilterIds = MMI->getFilterIds(); const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
@ -554,6 +553,7 @@ void DwarfException::EmitExceptionTable() {
Asm->EOL("LPStart format (DW_EH_PE_omit)"); Asm->EOL("LPStart format (DW_EH_PE_omit)");
#if 0 #if 0
// FIXME: This should default to what the system wants, not just "absptr".
if (!TypeInfos.empty() || !FilterIds.empty()) { if (!TypeInfos.empty() || !FilterIds.empty()) {
Asm->EmitInt8(TAI->PreferredEHDataFormat(DwarfEncoding::Data, true)); Asm->EmitInt8(TAI->PreferredEHDataFormat(DwarfEncoding::Data, true));
// FIXME: The comment here should correspond with what PreferredEHDataFormat // FIXME: The comment here should correspond with what PreferredEHDataFormat