private WyilFile.Case readFunctionOrMethodCase(Type.FunctionOrMethod type) throws IOException {
Block precondition = null;
Block postcondition = null;
Block body = null;
int numInputs = type.params().size();
int nBlocks = input.read_uv();
input.pad_u8();
for (int i = 0; i != nBlocks; ++i) {
int kind = input.read_uv();
int size = input.read_uv();
input.pad_u8();
switch (kind) {
case WyilFileWriter.BLOCK_Precondition:
precondition = readCodeBlock(numInputs);
break;
case WyilFileWriter.BLOCK_Postcondition:
postcondition = readCodeBlock(numInputs + 1);
break;
case WyilFileWriter.BLOCK_Body:
body = readCodeBlock(numInputs);
break;
default:
throw new RuntimeException("Unknown case block encountered");
}
}
return new WyilFile.Case(body, precondition, postcondition, Collections.EMPTY_LIST);
}
private WyilFile.MethodDeclaration readMethodBlock() throws IOException {
int nameIdx = input.read_uv();
// System.out.println("=== METHOD " + stringPool.get(nameIdx));
int modifiers = input.read_uv();
int typeIdx = input.read_uv();
int numCases = input.read_uv();
input.pad_u8();
Type.Method type = (Type.Method) typePool[typeIdx];
ArrayList<WyilFile.Case> cases = new ArrayList<WyilFile.Case>();
for (int i = 0; i != numCases; ++i) {
int kind = input.read_uv(); // unsued
int size = input.read_uv();
input.pad_u8();
switch (kind) {
case WyilFileWriter.BLOCK_Case:
cases.add(readFunctionOrMethodCase(type));
break;
default:
throw new RuntimeException("Unknown method block encountered");
}
}
return new WyilFile.MethodDeclaration(
generateModifiers(modifiers), stringPool[nameIdx], type, cases);
}
private WyilFile readModule() throws IOException {
int kind = input.read_uv(); // block identifier
int size = input.read_uv();
input.pad_u8();
int pathIdx = input.read_uv();
int modifiers = input.read_uv(); // unused
int numBlocks = input.read_uv();
input.pad_u8();
List<WyilFile.Declaration> declarations = new ArrayList<WyilFile.Declaration>();
for (int i = 0; i != numBlocks; ++i) {
declarations.add(readModuleBlock());
}
return new WyilFile(pathPool[pathIdx], "unknown.whiley", declarations);
}
private WyilFile.TypeDeclaration readTypeBlock() throws IOException {
int nameIdx = input.read_uv();
// System.out.println("=== TYPE " + stringPool.get(nameIdx));
int modifiers = input.read_uv();
int typeIdx = input.read_uv();
int nBlocks = input.read_uv();
input.pad_u8();
Block constraint = null;
if (nBlocks != 0) {
int kind = input.read_uv(); // unsued
int size = input.read_uv();
input.pad_u8();
constraint = readCodeBlock(1);
}
return new WyilFile.TypeDeclaration(
generateModifiers(modifiers), stringPool[nameIdx], typePool[typeIdx], constraint);
}
private WyilFile.ConstantDeclaration readConstantBlock() throws IOException {
int nameIdx = input.read_uv();
// System.out.println("=== CONSTANT " + stringPool.get(nameIdx));
int modifiers = input.read_uv();
int constantIdx = input.read_uv();
int nBlocks = input.read_uv(); // unused
input.pad_u8();
return new WyilFile.ConstantDeclaration(
generateModifiers(modifiers), stringPool[nameIdx], constantPool[constantIdx]);
}
public WyilFile read() throws IOException {
for (int i = 0; i != 8; ++i) {
char c = (char) input.read_u8();
if (magic[i] != c) {
throw new IllegalArgumentException("invalid magic number");
}
}
// head blocker
int kind = input.read_uv();
int size = input.read_uv();
input.pad_u8();
if (kind != WyilFileWriter.BLOCK_Header) {
throw new IllegalArgumentException("header block must come first");
}
int majorVersion = input.read_uv();
int minorVersion = input.read_uv();
int stringPoolSize = input.read_uv();
int pathPoolSize = input.read_uv();
int namePoolSize = input.read_uv();
int typePoolSize = input.read_uv();
int constantPoolSize = input.read_uv();
int numBlocks = input.read_uv();
readStringPool(stringPoolSize);
readPathPool(pathPoolSize);
readNamePool(namePoolSize);
readTypePool(typePoolSize);
readConstantPool(constantPoolSize);
input.pad_u8();
return readModule();
}
private WyilFile.Declaration readModuleBlock() throws IOException {
int kind = input.read_uv();
int size = input.read_uv();
input.pad_u8();
switch (kind) {
case WyilFileWriter.BLOCK_Constant:
return readConstantBlock();
case WyilFileWriter.BLOCK_Type:
return readTypeBlock();
case WyilFileWriter.BLOCK_Function:
return readFunctionBlock();
case WyilFileWriter.BLOCK_Method:
return readMethodBlock();
default:
throw new RuntimeException("unknown module block encountered (" + kind + ")");
}
}
private Block readCodeBlock(int numInputs) throws IOException {
Block block = new Block(numInputs);
int nCodes = input.read_uv();
HashMap<Integer, Code.Label> labels = new HashMap<Integer, Code.Label>();
for (int i = 0; i != nCodes; ++i) {
Code code = readCode(i, labels);
block.append(code);
}
// NOTE: we must go up to nCodes+1 because of the possibility of a label
// occurring after the very last bytecode instruction.
for (int i = 0, j = 0; i != nCodes + 1; ++i, ++j) {
Code.Label label = labels.get(i);
if (label != null) {
block.insert(j++, label);
}
}
input.pad_u8(); // necessary
return block;
}