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Add pmgen "fallthrough" statement 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-08-17 11:29:37 +02:00
parent cd5a372cd1
commit f95853c822
2 changed files with 17 additions and 3 deletions
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3
passes/pmgen/README.md
View File

@ -315,6 +315,9 @@ state variables used to pass arguments.
Subpatterns cann be called recursively. Subpatterns cann be called recursively.
If a `subpattern` statement is preceded by a `fallthrough` statement, this is
equivalent to calling the subpattern at the end of the preceding block.
Generate Blocks Generate Blocks
--------------- ---------------

17
passes/pmgen/pmgen.py
View File

@ -141,12 +141,23 @@ def process_pmgfile(f, filename):
assert current_pattern is not None assert current_pattern is not None
if cmd == "subpattern": if cmd == "fallthrough":
block = dict() block = dict()
block["type"] = "final" block["type"] = "fallthrough"
block["pattern"] = (current_pattern, current_subpattern)
blocks.append(block) blocks.append(block)
line = line.split() line = line.split()
assert len(line) == 1
continue
if cmd == "subpattern":
if len(blocks) == 0 or blocks[-1]["type"] != "fallthrough":
block = dict()
block["type"] = "final"
block["pattern"] = (current_pattern, current_subpattern)
blocks.append(block)
elif len(blocks) and blocks[-1]["type"] == "fallthrough":
del blocks[-1]
line = line.split()
assert len(line) == 2 assert len(line) == 2
current_subpattern = line[1] current_subpattern = line[1]
subpattern_args[(current_pattern, current_subpattern)] = list() subpattern_args[(current_pattern, current_subpattern)] = list()