parser: add support for constant value substitution

Register symbolic constants as defined symbols when they are
defined.  When a constant symbol reference occurs after it's
been defined, the parsed token is modified to be a number type,
whose value is the value constant symbol.

One difference between a "normal" number token and a "constant"
number token is that the the string in a constant token contains
a copy of the symbolic name, whereas its a null pointer for a
"normal" number.

Signed-off-by: Alex Elder <elder@linaro.org>
Message-Id: <20211001232338.769309-35-elder@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/symbolic_values.qmi b/tests/symbolic_values.qmi
new file mode 100644
index 0000000..79821b9
--- /dev/null
+++ b/tests/symbolic_values.qmi
@@ -0,0 +1,26 @@
+package test;
+
+# Request identifiers
+const TEST_REQUEST_RESPONSE = 35;
+const TEST_INDICATION = 37;
+
+# Message field identifiers
+const QMI_RESULT = 2;
+
+struct qmi_result {
+	u16 result;
+	u16 error;
+};
+
+request test_request {
+	required u8 test_number = 0x12;
+} = TEST_REQUEST_RESPONSE;	# Value 35 gets substitued
+
+response test_response {
+	# Value 2 gets substitued for QMI_RESULT
+	required qmi_result r = QMI_RESULT;
+} = TEST_REQUEST_RESPONSE;
+
+indication test_indication {
+	optional u64 value = 0x99;
+} = TEST_INDICATION;		# Value 37 gets substitued