blob: 78162f6485c448070138bc760d6ac5e2c8b297bf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
#include "clang/AST/APValue.h"
#include "clang/AST/Decl.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/Type.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/ASTMatchers/ASTMatchersInternal.h"
#include "clang/Basic/LLVM.h"
#include "clang/Sema/Ownership.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
#include <stdio.h>
#include <string>
#include <vector>
using namespace clang;
using namespace clang::ast_matchers;
struct Param {
std::string type;
std::string name;
};
class Printer : public MatchFinder::MatchCallback {
public:
virtual void run(const MatchFinder::MatchResult &Result) override {
const auto *varDecl = Result.Nodes.getNodeAs<VarDecl>("Struct");
auto *context = Result.Context;
if (!varDecl || !varDecl->getInit())
return;
// values contains the initializer list for the struct `syscall_metadata`
auto values = llvm::dyn_cast<InitListExpr>(varDecl->getInit())->inits();
if (values.empty())
return;
int argc = *values[2]->getIntegerConstantExpr(*context).value().getRawData();
std::vector<Param> args(argc);
if (argc) {
int i = 0;
for (const auto *type : // get parameter types
llvm::dyn_cast<InitListExpr>(
llvm::dyn_cast<VarDecl>(values[3]->getAsBuiltinConstantDeclRef(*context)->getUnderlyingDecl())
->getInit())
->inits()) {
args[i++].type = std::move(*type->tryEvaluateString(*context));
}
i = 0;
for (const auto *name : // get parameter names
llvm::dyn_cast<InitListExpr>(
llvm::dyn_cast<VarDecl>(values[4]->getAsBuiltinConstantDeclRef(*context)->getUnderlyingDecl())
->getInit())
->inits()) {
args[i++].name = std::move(*name->tryEvaluateString(*context));
}
}
printf("==========SYSCALL Found==========\n");
printf("%s\n", values[0]->tryEvaluateString(*context).value().c_str());
for (const auto &arg : args) {
printf("%s %s\n", arg.type.c_str(), arg.name.c_str());
}
}
};
int main(int argc, const char **argv) {
llvm::cl::OptionCategory SyzDeclExtractOptionCategory("SyzDeclExtract options");
auto ExpectedParser = clang::tooling::CommonOptionsParser::create(argc, argv, SyzDeclExtractOptionCategory);
if (!ExpectedParser) {
llvm::errs() << ExpectedParser.takeError();
return 1;
}
clang::tooling::CommonOptionsParser &OptionsParser = ExpectedParser.get();
clang::tooling::ClangTool Tool(OptionsParser.getCompilations(), OptionsParser.getSourcePathList());
DeclarationMatcher MetaDataMatcher =
varDecl(isExpandedFromMacro("SYSCALL_METADATA"), hasType(recordDecl(hasName("syscall_metadata")))).bind("Struct");
Printer Printer;
MatchFinder Finder;
Finder.addMatcher(MetaDataMatcher, &Printer);
return Tool.run(clang::tooling::newFrontendActionFactory(&Finder).get());
}
|
