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Parse whole contents of .gcc_except_table even if we are not printing.

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Summary:
We need to parse the whole contents of .gcc_except_table even if we are
not printing exceptions. Otherwise we are missing type index table and
miscalculate the size of the current table.

(cherry picked from FBD2632965)
This commit is contained in:
Maksim Panchenko
2015-11-09 12:27:13 -08:00
parent 2088875656
commit de46e6fc07
1 changed files with 40 additions and 31 deletions
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71
bolt/Exceptions.cpp
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@@ -158,6 +158,12 @@ void readLSDA(ArrayRef<uint8_t> LSDAData, BinaryContext &BC) {
uintptr_t ActionEntry = readULEB128(CallSitePtr);
uint64_t RangeBase = 0;
if (opts::PrintExceptions) {
errs() << "Call Site: [0x" << Twine::utohexstr(RangeBase + Start)
<< ", 0x" << Twine::utohexstr(RangeBase + Start + Length)
<< "); landing pad: 0x" << Twine::utohexstr(LPStart + LandingPad)
<< "; action entry: 0x" << Twine::utohexstr(ActionEntry) << "\n";
}
if (ActionEntry != 0) {
auto printType = [&] (int Index, raw_ostream &OS) {
assert(Index > 0 && "only positive indices are valid");
assert(TTypeEncoding == DW_EH_PE_udata4 &&
@@ -174,51 +180,54 @@ void readLSDA(ArrayRef<uint8_t> LSDAData, BinaryContext &BC) {
OS << "0x" << Twine::utohexstr(TypeAddress);
}
};
errs() << "Call Site: [0x" << Twine::utohexstr(RangeBase + Start)
<< ", 0x" << Twine::utohexstr(RangeBase + Start + Length)
<< "); landing pad: 0x" << Twine::utohexstr(LPStart + LandingPad)
<< "; action entry: 0x" << Twine::utohexstr(ActionEntry) << "\n";
if (ActionEntry != 0) {
if (opts::PrintExceptions)
errs() << " actions: ";
const uint8_t *ActionPtr = ActionTableStart + ActionEntry - 1;
long long ActionType;
long long ActionNext;
auto Sep = "";
do {
ActionType = readSLEB128(ActionPtr);
auto Self = ActionPtr;
ActionNext = readSLEB128(ActionPtr);
const uint8_t *ActionPtr = ActionTableStart + ActionEntry - 1;
long long ActionType;
long long ActionNext;
auto Sep = "";
do {
ActionType = readSLEB128(ActionPtr);
auto Self = ActionPtr;
ActionNext = readSLEB128(ActionPtr);
if (opts::PrintExceptions)
errs() << Sep << "(" << ActionType << ", " << ActionNext << ") ";
if (ActionType == 0) {
if (ActionType == 0) {
if (opts::PrintExceptions)
errs() << "cleanup";
} else if (ActionType > 0) {
// It's an index into a type table.
} else if (ActionType > 0) {
// It's an index into a type table.
if (opts::PrintExceptions) {
errs() << "catch type ";
printType(ActionType, errs());
} else { // ActionType < 0
}
} else { // ActionType < 0
if (opts::PrintExceptions)
errs() << "filter exception types ";
auto TSep = "";
// ActionType is a negative byte offset into uleb128-encoded table
// of indices with base 1.
// E.g. -1 means offset 0, -2 is offset 1, etc. The indices are
// encoded using uleb128 so we cannot directly dereference them.
auto TypeIndexTablePtr = TypeIndexTableStart - ActionType - 1;
while (auto Index = readULEB128(TypeIndexTablePtr)) {
auto TSep = "";
// ActionType is a negative byte offset into uleb128-encoded table
// of indices with base 1.
// E.g. -1 means offset 0, -2 is offset 1, etc. The indices are
// encoded using uleb128 so we cannot directly dereference them.
auto TypeIndexTablePtr = TypeIndexTableStart - ActionType - 1;
while (auto Index = readULEB128(TypeIndexTablePtr)) {
if (opts::PrintExceptions) {
errs() << TSep;
printType(Index, errs());
TSep = ", ";
}
MaxTypeIndexTableOffset =
std::max(MaxTypeIndexTableOffset,
TypeIndexTablePtr - TypeIndexTableStart);
}
MaxTypeIndexTableOffset =
std::max(MaxTypeIndexTableOffset,
TypeIndexTablePtr - TypeIndexTableStart);
}
Sep = "; ";
Sep = "; ";
ActionPtr = Self + ActionNext;
} while (ActionNext);
ActionPtr = Self + ActionNext;
} while (ActionNext);
if (opts::PrintExceptions)
errs() << '\n';
}
}
if (LandingPad != 0 || ActionEntry != 0)