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597ac471cc
Labels are matched using a regexp of the form '^(pattern):', which requires the addition of a "suffix" concept to NamelessValue. Aside from that, the key challenge is that block labels are values, and we typically capture values including the prefix '%'. However, when labels appear at the start of a basic block, the prefix '%' is not included, so we must capture block label values *without* the prefix '%'. We don't know ahead of time whether an IR value is a label or not. In most cases, they are prefixed by the word "label" (their type), but this isn't the case in phi nodes. We solve this issue by leveraging the two-phase nature of variable generalization: the first pass finds all occurences of a variable and determines whether the '%' prefix can be included or not. The second pass does the actual substitution. This change also unifies the generalization path for assembly with that for IR and analysis, in the hope that any future changes avoid diverging those cases future. I also considered the alternative of trying to detect the phi node case using more regular expression special cases but ultimately decided against that because it seemed more fragile, and perhaps the approach of keeping a tentative prefix that may later be discarded could also be eventually applied to some metadata and attribute cases. Note that an early version of this change was reviewed as https://reviews.llvm.org/D142452, before version numbers were introduced. This is a substantially updated version of that change.
80 lines
1.9 KiB
Python
80 lines
1.9 KiB
Python
import re
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from . import common
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import sys
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if sys.version_info[0] > 2:
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class string:
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expandtabs = str.expandtabs
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else:
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import string
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# Support of isel debug checks
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# RegEx: this is where the magic happens.
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##### iSel parser
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# TODO: add function prefix
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ISEL_FUNCTION_DEFAULT_RE = re.compile(
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r"Selected[\s]*selection[\s]*DAG:[\s]*%bb.0[\s]*\'(?P<func>.*?):[^\']*\'*\n"
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r"(?P<body>.*?)\n"
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r"Total[\s]*amount[\s]*of[\s]*phi[\s]*nodes[\s]*to[\s]*update:[\s]*[0-9]+",
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flags=(re.M | re.S),
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)
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def scrub_isel_default(isel, args):
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# Scrub runs of whitespace out of the iSel debug output, but leave the leading
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# whitespace in place.
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isel = common.SCRUB_WHITESPACE_RE.sub(r" ", isel)
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# Expand the tabs used for indentation.
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isel = string.expandtabs(isel, 2)
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# Strip trailing whitespace.
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isel = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r"", isel)
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return isel
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def get_run_handler(triple):
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target_handlers = {}
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handler = None
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best_prefix = ""
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for prefix, s in target_handlers.items():
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if triple.startswith(prefix) and len(prefix) > len(best_prefix):
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handler = s
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best_prefix = prefix
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if handler is None:
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common.debug("Using default handler.")
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handler = (scrub_isel_default, ISEL_FUNCTION_DEFAULT_RE)
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return handler
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##### Generator of iSel CHECK lines
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def add_checks(
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output_lines,
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comment_marker,
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prefix_list,
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func_dict,
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func_name,
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ginfo: common.GeneralizerInfo,
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global_vars_seen_dict,
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is_filtered,
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):
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# Label format is based on iSel string.
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check_label_format = "{} %s-LABEL: %s%s%s%s".format(comment_marker)
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return common.add_checks(
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output_lines,
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comment_marker,
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prefix_list,
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func_dict,
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func_name,
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check_label_format,
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ginfo,
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global_vars_seen_dict,
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is_filtered=is_filtered,
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)
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