1 //===-- Verifier.cpp - Implement the Module Verifier -------------*- C++ -*-==//
3 // This file defines the method verifier interface, that can be used for some
4 // sanity checking of input to the system.
6 // Note that this does not provide full 'java style' security and verifications,
7 // instead it just tries to ensure that code is well formed.
9 // . There are no duplicated names in a symbol table... ie there !exist a val
10 // with the same name as something in the symbol table, but with a different
11 // address as what is in the symbol table...
12 // . Both of a binary operator's parameters are the same type
13 // . Verify that arithmetic and other things are only performed on first class
14 // types. No adding structures or arrays.
15 // . All of the constants in a switch statement are of the correct type
16 // . The code is in valid SSA form
17 // . It should be illegal to put a label into any other type (like a structure)
18 // or to return one. [except constant arrays!]
19 // . Right now 'add bool 0, 0' is valid. This isn't particularly good.
20 // . Only phi nodes can be self referential: 'add int 0, 0 ; <int>:0' is bad
21 // . PHI nodes must have an entry for each predecessor, with no extras.
22 // . All other things that are tested by asserts spread about the code...
23 // . All basic blocks should only end with terminator insts, not contain them
24 // . All methods must have >= 1 basic block
25 // . Verify that none of the Value getType()'s are null.
26 // . Method's cannot take a void typed parameter
27 // . Verify that a method's argument list agrees with it's declared type.
28 // . Verify that arrays and structures have fixed elements: No unsized arrays.
30 //===----------------------------------------------------------------------===//
32 #include "llvm/Analysis/Verifier.h"
33 #include "llvm/Method.h"
34 #include "llvm/Module.h"
35 #include "llvm/BasicBlock.h"
36 #include "llvm/Type.h"
41 // Error - Define a macro to do the common task of pushing a message onto the
42 // end of the error list and setting Bad to true.
44 #define Error(msg) do { ErrorMsgs.push_back(msg); Bad = true; } while (0)
46 #define t(x) (1 << (unsigned)Type::x)
48 #define SignedIntegralTypes (t(SByteTyID) | t(ShortTyID) | \
49 t(IntTyID) | t(LongTyID))
50 static long UnsignedIntegralTypes = t(UByteTyID) | t(UShortTyID) |
51 t(UIntTyID) | t(ULongTyID);
52 static const long FloatingPointTypes = t(FloatTyID) | t(DoubleTyID);
54 static const long IntegralTypes = SignedIntegralTypes | UnsignedIntegralTypes;
57 static long ValidTypes[Type::FirstDerivedTyID] = {
58 [(unsigned)Instruction::UnaryOps::Not] t(BoolTyID),
59 //[Instruction::UnaryOps::Add] = IntegralTypes,
60 // [Instruction::Sub] = IntegralTypes,
66 static bool verify(const BasicBlock *BB, vector<string> &ErrorMsgs) {
68 if (BB->getTerminator() == 0) Error("Basic Block does not have terminator!");
75 bool verify(const Method *M, vector<string> &ErrorMsgs) {
78 for (Method::const_iterator BBIt = M->begin();
79 BBIt != M->end(); ++BBIt)
80 Bad |= verify(*BBIt, ErrorMsgs);
85 bool verify(const Module *C, vector<string> &ErrorMsgs) {
87 assert(Type::FirstDerivedTyID-1 < sizeof(long)*8 &&
88 "Resize ValidTypes table to handle more than 32 primitive types!");
90 for (Module::const_iterator MI = C->begin(); MI != C->end(); ++MI)
91 Bad |= verify(*MI, ErrorMsgs);