mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-03-21 03:32:29 +00:00
read basic constants: null, undef, integers <= 64bits
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36389 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
631a8ed3ff
commit
e16504eb4e
lib/Bitcode/Reader
@ -13,6 +13,7 @@
|
||||
|
||||
#include "BitcodeReader.h"
|
||||
#include "llvm/Bitcode/BitstreamReader.h"
|
||||
#include "llvm/Constants.h"
|
||||
#include "llvm/DerivedTypes.h"
|
||||
#include "llvm/Module.h"
|
||||
#include "llvm/ADT/SmallString.h"
|
||||
@ -303,6 +304,78 @@ bool BitcodeReader::ParseValueSymbolTable(BitstreamReader &Stream) {
|
||||
}
|
||||
}
|
||||
|
||||
bool BitcodeReader::ParseConstants(BitstreamReader &Stream) {
|
||||
if (Stream.EnterSubBlock())
|
||||
return Error("Malformed block record");
|
||||
|
||||
SmallVector<uint64_t, 64> Record;
|
||||
|
||||
// Read all the records for this value table.
|
||||
const Type *CurTy = Type::Int32Ty;
|
||||
while (1) {
|
||||
unsigned Code = Stream.ReadCode();
|
||||
if (Code == bitc::END_BLOCK) {
|
||||
// If there are global var inits to process, do so now.
|
||||
if (!GlobalInits.empty()) {
|
||||
while (!GlobalInits.empty()) {
|
||||
unsigned ValID = GlobalInits.back().second;
|
||||
if (ValID >= ValueList.size())
|
||||
return Error("Invalid value ID for global var init!");
|
||||
if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
|
||||
GlobalInits.back().first->setInitializer(C);
|
||||
else
|
||||
return Error("Global variable initializer is not a constant!");
|
||||
GlobalInits.pop_back();
|
||||
}
|
||||
}
|
||||
|
||||
return Stream.ReadBlockEnd();
|
||||
}
|
||||
|
||||
if (Code == bitc::ENTER_SUBBLOCK) {
|
||||
// No known subblocks, always skip them.
|
||||
Stream.ReadSubBlockID();
|
||||
if (Stream.SkipBlock())
|
||||
return Error("Malformed block record");
|
||||
continue;
|
||||
}
|
||||
|
||||
if (Code == bitc::DEFINE_ABBREV) {
|
||||
Stream.ReadAbbrevRecord();
|
||||
continue;
|
||||
}
|
||||
|
||||
// Read a record.
|
||||
Record.clear();
|
||||
Value *V = 0;
|
||||
switch (Stream.ReadRecord(Code, Record)) {
|
||||
default: // Default behavior: unknown constant
|
||||
case bitc::CST_CODE_UNDEF: // UNDEF
|
||||
V = UndefValue::get(CurTy);
|
||||
break;
|
||||
case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid]
|
||||
if (Record.empty())
|
||||
return Error("Malformed CST_SETTYPE record");
|
||||
if (Record[0] >= TypeList.size())
|
||||
return Error("Invalid Type ID in CST_SETTYPE record");
|
||||
CurTy = TypeList[Record[0]];
|
||||
continue;
|
||||
case bitc::CST_CODE_NULL: // NULL
|
||||
V = Constant::getNullValue(CurTy);
|
||||
break;
|
||||
case bitc::CST_CODE_INTEGER: // INTEGER: [intval]
|
||||
if (!isa<IntegerType>(CurTy))
|
||||
return Error("Invalid type for CST_INTEGER");
|
||||
if (Record[0] & 1)
|
||||
V = ConstantInt::get(CurTy, -(Record[0]>>1));
|
||||
else
|
||||
V = ConstantInt::get(CurTy, Record[0]>>1);
|
||||
break;
|
||||
}
|
||||
|
||||
ValueList.push_back(V);
|
||||
}
|
||||
}
|
||||
|
||||
bool BitcodeReader::ParseModule(BitstreamReader &Stream,
|
||||
const std::string &ModuleID) {
|
||||
@ -346,6 +419,10 @@ bool BitcodeReader::ParseModule(BitstreamReader &Stream,
|
||||
if (ParseValueSymbolTable(Stream))
|
||||
return true;
|
||||
break;
|
||||
case bitc::CONSTANTS_BLOCK_ID:
|
||||
if (ParseConstants(Stream))
|
||||
return true;
|
||||
break;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
@ -22,14 +22,14 @@
|
||||
namespace llvm {
|
||||
class BitstreamReader;
|
||||
class Value;
|
||||
class GlobalValue;
|
||||
class GlobalVariable;
|
||||
|
||||
class BitcodeReader : public ModuleProvider {
|
||||
const char *ErrorString;
|
||||
|
||||
std::vector<PATypeHolder> TypeList;
|
||||
std::vector<Value*> ValueList;
|
||||
std::vector<std::pair<GlobalValue*, unsigned> > GlobalInits;
|
||||
std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
|
||||
public:
|
||||
virtual ~BitcodeReader() {}
|
||||
|
||||
@ -64,6 +64,7 @@ private:
|
||||
bool ParseTypeTable(BitstreamReader &Stream);
|
||||
bool ParseTypeSymbolTable(BitstreamReader &Stream);
|
||||
bool ParseValueSymbolTable(BitstreamReader &Stream);
|
||||
bool ParseConstants(BitstreamReader &Stream);
|
||||
};
|
||||
|
||||
} // End llvm namespace
|
||||
|
Loading…
x
Reference in New Issue
Block a user