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added ability to iterate over basic block's predecessors #776

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added ability to iterate over basic block's predecessors #776

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e169482
added ability to iterate over basic block's predecessors
carpall Oct 12, 2021
b7c8ba1
removing ;
carpall Oct 12, 2021
df0454e
fixing not in
carpall Oct 12, 2021
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7 changes: 7 additions & 0 deletions llvmlite/ir/builder.py
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Original file line number Diff line number Diff line change
Expand Up @@ -822,12 +822,17 @@ def switch(self, value, default):
self._set_terminator(swt)
return swt

def add_pred(self, block):
if not self.basic_block in block.predecessors:
block.predecessors.append(self.basic_block)

def branch(self, target):
"""
Unconditional branch to *target*.
"""
br = instructions.Branch(self.block, "br", [target])
self._set_terminator(br)
self.add_pred(target)
return br

def cbranch(self, cond, truebr, falsebr):
Expand All @@ -837,6 +842,8 @@ def cbranch(self, cond, truebr, falsebr):
br = instructions.ConditionalBranch(self.block, "br",
[cond, truebr, falsebr])
self._set_terminator(br)
self.add_pred(truebr)
self.add_pred(falsebr)
return br

def branch_indirect(self, addr):
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4 changes: 4 additions & 0 deletions llvmlite/ir/values.py
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Original file line number Diff line number Diff line change
Expand Up @@ -788,11 +788,15 @@ def __init__(self, parent, name=''):
self.scope = parent.scope
self.instructions = []
self.terminator = None
self.predecessors = []

@property
def is_terminated(self):
return self.terminator is not None

def has_predecessors(self):
return len(self.predecessors) > 0

@property
def function(self):
return self.parent
Expand Down