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finish (inefficient) BMC for non-linear Horn

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2012-10-15 10:49:19 -07:00
parent b6e7d4ecc6 f7f2a77504
commit 2c24f25050
6 changed files with 46 additions and 13 deletions
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4
RELEASE_NOTES
View file

@ -30,6 +30,10 @@ Version 4.2
- Z3 by default switches to an incremental solver when a Solver object is used to solve many queries.
In the this version, we switch back to the tactic framework if the incremental solver returns "unknown".
- Allow negative numerals in the SMT 2.0 frontend. That is, Z3 SMT 2.0 parser now accepts numerals such as "-2". It is not needed to encode them as "(- 2)" anymore.
The parser still accepts -foo as a symbol. That is, it is *not* a shorthand for (- foo).
This feature is disabled when SMTLIB2_COMPLIANT=true is set in the command line.
- Now, Z3 can be compiled inside cygwin using gcc.
- Fixed bug in the unsat core generation.

1
lib/cmd_context.h
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@ -246,6 +246,7 @@ protected:
public:
cmd_context(front_end_params & params, bool main_ctx = true, ast_manager * m = 0, symbol const & l = symbol::null);
~cmd_context();
bool is_smtlib2_compliant() const { return m_params.m_smtlib2_compliant; }
void set_logic(symbol const & s);
bool has_logic() const { return m_logic != symbol::null; }
symbol const & get_logic() const { return m_logic; }

2
lib/pdr_dl_interface.cpp
View file

@ -186,7 +186,7 @@ void dl_interface::collect_params(param_descrs& p) {
p.insert(":use-farkas", CPK_BOOL, "PDR: (default true) use lemma generator based on Farkas (for linear real arithmetic)");
p.insert(":generate-proof-trace", CPK_BOOL, "PDR: (default false) trace for 'sat' answer as proof object");
p.insert(":inline-proofs", CPK_BOOL, "PDR: (default true) run PDR with proof mode turned on and extract Farkas coefficients directly (instead of creating a separate proof object when extracting coefficients)");
p.insert(":flexible-trace", CPK_BOOL, "PDR: (default true) allow PDR generate long counter-examples by extending candidate trace within search area");
p.insert(":flexible-trace", CPK_BOOL, "PDR: (default false) allow PDR generate long counter-examples by extending candidate trace within search area");
PRIVATE_PARAMS(p.insert(":use-farkas-model", CPK_BOOL, "PDR: (default false) enable using Farkas generalization through model propagation"););
PRIVATE_PARAMS(p.insert(":use-precondition-generalizer", CPK_BOOL, "PDR: (default false) enable generalizations from weakest pre-conditions"););
PRIVATE_PARAMS(p.insert(":use-multicore-generalizer", CPK_BOOL, "PDR: (default false) extract multiple cores for blocking states"););

2
lib/smt2parser.cpp
View file

@ -2353,7 +2353,7 @@ namespace smt2 {
public:
parser(cmd_context & ctx, std::istream & is, bool interactive):
m_ctx(ctx),
m_scanner(is, interactive),
m_scanner(ctx, is, interactive),
m_curr(scanner::NULL_TOKEN),
m_curr_cmd(0),
m_num_bindings(0),

45
lib/smt2scanner.cpp
View file

@ -87,17 +87,12 @@ namespace smt2 {
next();
}
}
scanner::token scanner::read_symbol() {
SASSERT(m_normalized[static_cast<unsigned>(curr())] == 'a' || curr() == ':');
m_string.reset();
m_string.push_back(curr());
next();
scanner::token scanner::read_symbol_core() {
while (true) {
char c = curr();
char n = m_normalized[static_cast<unsigned char>(c)];
if (n == 'a' || n == '0') {
if (n == 'a' || n == '0' || n == '-') {
m_string.push_back(c);
next();
}
@ -110,6 +105,14 @@ namespace smt2 {
}
}
scanner::token scanner::read_symbol() {
SASSERT(m_normalized[static_cast<unsigned>(curr())] == 'a' || curr() == ':' || curr() == '-');
m_string.reset();
m_string.push_back(curr());
next();
read_symbol_core();
}
scanner::token scanner::read_number() {
SASSERT('0' <= curr() && curr() <= '9');
rational q(1);
@ -140,6 +143,22 @@ namespace smt2 {
TRACE("scanner", tout << "new number: " << m_number << "\n";);
return is_float ? FLOAT_TOKEN : INT_TOKEN;
}
scanner::token scanner::read_signed_number() {
SASSERT(curr() == '-');
next();
if ('0' <= curr() && curr() <= '9') {
scanner::token r = read_number();
m_number.neg();
return r;
}
else {
// it is a symbol.
m_string.reset();
m_string.push_back('-');
return read_symbol_core();
}
}
scanner::token scanner::read_string() {
SASSERT(curr() == '\"');
@ -222,7 +241,8 @@ namespace smt2 {
}
}
scanner::scanner(std::istream& stream, bool interactive):
scanner::scanner(cmd_context & ctx, std::istream& stream, bool interactive):
m_ctx(ctx),
m_interactive(interactive),
m_spos(0),
m_curr(0), // avoid Valgrind warning
@ -259,7 +279,7 @@ namespace smt2 {
m_normalized[static_cast<int>('&')] = 'a';
m_normalized[static_cast<int>('*')] = 'a';
m_normalized[static_cast<int>('_')] = 'a';
m_normalized[static_cast<int>('-')] = 'a';
m_normalized[static_cast<int>('-')] = '-';
m_normalized[static_cast<int>('+')] = 'a';
m_normalized[static_cast<int>('=')] = 'a';
m_normalized[static_cast<int>('<')] = 'a';
@ -304,6 +324,11 @@ namespace smt2 {
return read_number();
case '#':
return read_bv_literal();
case '-':
if (m_ctx.is_smtlib2_compliant())
return read_symbol();
else
return read_signed_number();
case -1:
return EOF_TOKEN;
default: {

5
lib/smt2scanner.h
View file

@ -31,6 +31,7 @@ namespace smt2 {
class scanner {
private:
cmd_context & m_ctx;
bool m_interactive;
int m_spos; // position in the current line of the stream
char m_curr; // current char;
@ -73,7 +74,7 @@ namespace smt2 {
EOF_TOKEN
};
scanner(std::istream& stream, bool interactive = false);
scanner(cmd_context & ctx, std::istream& stream, bool interactive = false);
~scanner() {}
@ -85,10 +86,12 @@ namespace smt2 {
char const * get_string() const { return m_string.begin(); }
token scan();
token read_symbol_core();
token read_symbol();
token read_quoted_symbol();
void read_comment();
token read_number();
token read_signed_number();
token read_string();
token read_bv_literal();