Zack Buhman
ea3c389944
Previously, ast transformations were performed informally as ad-hoc modifications to the generated C source code. In this commit, the same transformations are performed by rewriting the ast prior to code generation time. The most significant new transformer is transform_assignment_list. This transforms assignments such as: a, b, c = f(b, c, d) To: a = f(&b, &c, d) The former syntax is used frequently in the manual's description of FPU-related instructions.
43 lines
830 B
Python
43 lines
830 B
Python
from pprint import pprint
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from lexer import Lexer
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from parser import Parser
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from ast_to_c_source import generate
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sources = [
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"op1 ← FloatValue64(DR2n);",
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"UTLB[MMUCR.URC].ASID ← PTEH.ASID;",
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"IF (n_field = m_field)"
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"{"
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"m_address ← m_address + 4;"
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"n_address ← n_address + 4;"
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"}",
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"""
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IF (op1 ≥ 0)
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op2 ← op2 << shift_amount;
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ELSE IF (shift_amount ≠ 0)
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op2 ← op2 >> (32 - shift_amount);
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"""
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]
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def all_tokens(lexer):
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while True:
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try:
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token = lexer.next_token()
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except IndexError:
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break
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yield token
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def dump(source):
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lexer = Lexer(source)
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tokens = list(all_tokens(lexer))
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parser = Parser(tokens)
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root = parser.statement()
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pprint(root)
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source = "c ← foobar(b, c, d);"
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dump(source);
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