Add CLI option to choose model checker engine

test/cmdlineTests/standard_model_checker_engine_bmc/input.json

@@ -0,0 +1,14 @@
+{
+	"language": "Solidity",
+	"sources":
+	{
+		"A":
+		{
+			"content": "// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.0;\npragma experimental SMTChecker;\ncontract C { function f(uint x) public pure { assert(x > 0); } }"
+		}
+	},
+	"settings":
+	{
+		"modelCheckerEngine": "bmc"
+	}
+}

test/cmdlineTests/standard_model_checker_engine_bmc/output.json

@@ -0,0 +1,30 @@
+{"auxiliaryInputRequested":{"smtlib2queries":{"0x4ca2adc24a17cd524cf3113f3b2cddff216f428f804e884cf76d27dd3e72cd68":"(set-option :produce-models true)
+(set-logic ALL)
+(declare-fun |error_0| () Int)
+(declare-fun |this_0| () Int)
+(declare-datatypes ((|state_type| 0)) (((|state_type| (|balances| (Array Int Int))))))
+(declare-fun |state_0| () |state_type|)
+(declare-datatypes ((|bytes_tuple| 0)) (((|bytes_tuple| (|bytes_tuple_accessor_array| (Array Int Int)) (|bytes_tuple_accessor_length| Int)))))
+(declare-datatypes ((|tx_type| 0)) (((|tx_type| (|block.coinbase| Int) (|block.difficulty| Int) (|block.gaslimit| Int) (|block.number| Int) (|block.timestamp| Int) (|blockhash| (Array Int Int)) (|msg.data| |bytes_tuple|) (|msg.sender| Int) (|msg.sig| Int) (|msg.value| Int) (|tx.gasprice| Int) (|tx.origin| Int)))))
+(declare-fun |tx_0| () |tx_type|)
+(declare-fun |x_4_0| () Int)
+(declare-fun |expr_8_0| () Int)
+(declare-fun |expr_9_0| () Int)
+(declare-fun |expr_10_1| () Bool)
+
+(assert (and (and true (and (= expr_10_1 (> expr_8_0 expr_9_0)) (and (= expr_9_0 0) (and (= expr_8_0 x_4_0) (and (and (>= x_4_0 0) (<= x_4_0 115792089237316195423570985008687907853269984665640564039457584007913129639935)) true))))) (not expr_10_1)))
+(declare-const |EVALEXPR_0| Int)
+(assert (= |EVALEXPR_0| x_4_0))
+(check-sat)
+(get-value (|EVALEXPR_0| ))
+"}},"errors":[{"component":"general","errorCode":"4661","formattedMessage":"A:4:47: Warning: BMC: Assertion violation happens here.
+contract C { function f(uint x) public pure { assert(x > 0); } }
+                                              ^-----------^
+Counterexample:
+  x = 0
+
+Callstack:
+
+","message":"BMC: Assertion violation happens here.","secondarySourceLocations":[{"message":"Counterexample:
+  x = 0
+"},{"message":"Callstack:"},{"message":""}],"severity":"warning","sourceLocation":{"end":150,"file":"A","start":137},"type":"Warning"}],"sources":{"A":{"id":0}}}