9b5295f3e2
This makes the details of the spiderwasm prologue configurable so it is easier to modify SpiderMonkey without having to change Cretonne. Create a stack object representing the SpiderMonkey prologue words before calculating the stack layout so they won't be overwritten by Cretonne's stack objects.
74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
"""
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Cretonne shared settings.
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This module defines settings relevant for all code generators.
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"""
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from __future__ import absolute_import
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from cdsl.settings import SettingGroup, BoolSetting, EnumSetting, NumSetting
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group = SettingGroup('shared')
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opt_level = EnumSetting(
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"""
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Optimization level:
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- default: Very profitable optimizations enabled, none slow.
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- best: Enable all optimizations
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- fastest: Optimize for compile time by disabling most optimizations.
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""",
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'default', 'best', 'fastest')
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enable_verifier = BoolSetting(
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"""
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Run the Cretonne IL verifier at strategic times during compilation.
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This makes compilation slower but catches many bugs. The verifier is
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disabled by default, except when reading Cretonne IL from a text file.
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""")
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is_64bit = BoolSetting("Enable 64-bit code generation")
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return_at_end = BoolSetting(
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"""
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Generate functions with at most a single return instruction at the
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end of the function.
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This guarantees that functions do not have any internal return
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instructions. Either they never return, or they have a single return
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instruction at the end.
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""")
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is_compressed = BoolSetting("Enable compressed instructions")
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enable_float = BoolSetting(
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"""Enable the use of floating-point instructions""",
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default=True)
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enable_simd = BoolSetting(
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"""Enable the use of SIMD instructions.""",
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default=True)
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enable_atomics = BoolSetting(
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"""Enable the use of atomic instructions""",
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default=True)
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#
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# Settings specific to the `spiderwasm` calling convention.
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#
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spiderwasm_prologue_words = NumSetting(
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"""
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Number of pointer-sized words pushed by the spiderwasm prologue.
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Functions with the `spiderwasm` calling convention don't generate their
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own prologue and epilogue. They depend on externally generated code
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that pushes a fixed number of words in the prologue and restores them
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in the epilogue.
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This setting configures the number of pointer-sized words pushed on the
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stack when the Cretonne-generated code is entered. This includes the
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pushed return address on Intel ISAs.
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""")
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group.close(globals())
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