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RemoteMirror: Project some multi-payload enums (#30357)

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* First part of multi-payload enum support

This handles multi-payload enums with fixed
layouts that don't use spare payload bits.
It includes XI calculations that allow us to
handle single-payload enums where the payload
ultimately includes a multi-payload enum
(For example, on 32-bit platforms, String uses
a multi-payload enum, so this now supports single-payload
enums carrying Strings.)
This commit is contained in:
tbkka
2020-03-11 18:48:39 -07:00
committed by GitHub
parent 80820cc7d6
commit ee36c1cc3e
6 changed files with 232 additions and 52 deletions
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44
include/swift/Remote/MemoryReader.h
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@@ -64,44 +64,20 @@ public:
/// Attempts to read an integer of the specified size from the given
/// address in the remote process.
///
/// Returns false if the operation failed, the request size is not
/// 1, 2, 4, or 8, or the request size is larger than the provided destination.
/// Returns false if the operation failed, or the request size is
/// larger than the provided destination.
template <typename IntegerType>
bool readInteger(RemoteAddress address, size_t bytes, IntegerType *dest) {
if (bytes > sizeof(IntegerType))
return false;
switch (bytes) {
case 1: {
uint8_t n;
if (!readInteger(address, &n))
return false;
*dest = n;
break;
}
case 2: {
uint16_t n;
if (!readInteger(address, &n))
return false;
*dest = n;
break;
}
case 4: {
uint32_t n;
if (!readInteger(address, &n))
return false;
*dest = n;
break;
}
case 8: {
uint64_t n;
if (!readInteger(address, &n))
return false;
*dest = n;
break;
}
default:
*dest = 0;
if ((bytes > sizeof(IntegerType))
|| !readBytes(address, (uint8_t *)dest, bytes)) {
return false;
}
// FIXME: Assumes host and target have the same endianness.
// TODO: Query DLQ for endianness of target, compare to endianness of host.
#if defined(__BIG_ENDIAN__)
*dest >>= (sizeof(IntegerType) - bytes);
#endif
return true;
}