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LLVMIRGenerator: emit debug information.

This commit is contained in:
whitequark 2015-08-10 15:11:52 +03:00
parent 4f02f6e667
commit c63ec70c53
1 changed files with 163 additions and 17 deletions

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@ -3,6 +3,7 @@
into LLVM intermediate representation. into LLVM intermediate representation.
""" """
import os
from pythonparser import ast, diagnostic from pythonparser import ast, diagnostic
from llvmlite_artiq import ir as ll from llvmlite_artiq import ir as ll
from .. import types, builtins, ir from .. import types, builtins, ir
@ -14,7 +15,147 @@ lli8 = ll.IntType(8)
lli32 = ll.IntType(32) lli32 = ll.IntType(32)
lldouble = ll.DoubleType() lldouble = ll.DoubleType()
llptr = ll.IntType(8).as_pointer() llptr = ll.IntType(8).as_pointer()
llemptyptr = ll.LiteralStructType( []).as_pointer() llmetadata = ll.MetaData()
DW_LANG_Python = 0x0014
DW_TAG_compile_unit = 17
DW_TAG_subroutine_type = 21
DW_TAG_file_type = 41
DW_TAG_subprogram = 46
def memoize(generator):
def memoized(self, *args):
result = self.cache.get((generator,) + args, None)
if result is None:
return generator(self, *args)
else:
return result
return memoized
class DebugInfoEmitter:
def __init__(self, llmodule):
self.llmodule = llmodule
self.cache = {}
self.subprograms = []
def emit(self, operands):
def map_operand(operand):
if operand is None:
return ll.Constant(llmetadata, None)
elif isinstance(operand, str):
return ll.MetaDataString(self.llmodule, operand)
elif isinstance(operand, bool):
return ll.Constant(lli1, operand)
elif isinstance(operand, int):
return ll.Constant(lli32, operand)
elif isinstance(operand, (list, tuple)):
return self.emit(operand)
elif isinstance(operand, ll.Value):
return operand
else:
print(operand)
assert False
return self.llmodule.add_metadata(list(map(map_operand, operands)))
@memoize
def emit_filename(self, source_buffer):
source_dir, source_file = os.path.split(source_buffer.name)
return self.emit([source_file, source_dir])
@memoize
def emit_compile_unit(self, source_buffer, llsubprograms):
return self.emit([
DW_TAG_compile_unit,
self.emit_filename(source_buffer), # filename
DW_LANG_Python, # source language
"ARTIQ", # producer
False, # optimized?
"", # linker flags
0, # runtime version
[], # enum types
[], # retained types
llsubprograms, # subprograms
[], # global variables
[], # imported entities
"", # split debug filename
2, # kind (full=1, lines only=2)
])
@memoize
def emit_file(self, source_buffer):
return self.emit([
DW_TAG_file_type,
self.emit_filename(source_buffer), # filename
])
@memoize
def emit_subroutine_type(self, typ):
return self.emit([
DW_TAG_subroutine_type,
None, # filename
None, # context descriptor
"", # name
0, # line number
0, # (i64) size in bits
0, # (i64) alignment in bits
0, # (i64) offset in bits
0, # flags
None, # derived from
[None], # members
0, # runtime languages
None, # base type with vtable pointer
None, # template parameters
None # unique identifier
])
@memoize
def emit_subprogram(self, func, llfunc):
source_buffer = func.loc.source_buffer
display_name = "{}{}".format(func.name, types.TypePrinter().name(func.type))
subprogram = self.emit([
DW_TAG_subprogram,
self.emit_filename(source_buffer), # filename
self.emit_file(source_buffer), # context descriptor
func.name, # name
display_name, # display name
llfunc.name, # linkage name
func.loc.line(), # line number where defined
self.emit_subroutine_type(func.type), # type descriptor
func.is_internal, # local to compile unit?
True, # global is defined in the compile unit?
0, # virtuality
0, # index into a virtual function
None, # base type with vtable pointer
0, # flags
False, # optimized?
llfunc, # LLVM function
None, # template parameters
None, # function declaration descriptor
[], # function variables
func.loc.line(), # line number where scope begins
])
self.subprograms.append(subprogram)
return subprogram
@memoize
def emit_loc(self, loc, scope, inlined_scope=None):
return self.emit([
loc.line(), # line
loc.column(), # column
scope, # scope
inlined_scope, # inlined scope
])
def finalize(self, source_buffer):
llident = self.llmodule.add_named_metadata('llvm.ident')
llident.add(self.emit(["ARTIQ"]))
llflags = self.llmodule.add_named_metadata('llvm.module.flags')
llflags.add(self.emit([2, "Debug Info Version", 1]))
llcompile_units = self.llmodule.add_named_metadata('llvm.dbg.cu')
llcompile_units.add(self.emit_compile_unit(source_buffer, tuple(self.subprograms)))
class LLVMIRGenerator: class LLVMIRGenerator:
@ -27,8 +168,8 @@ class LLVMIRGenerator:
self.llmodule.data_layout = target.data_layout self.llmodule.data_layout = target.data_layout
self.llfunction = None self.llfunction = None
self.llmap = {} self.llmap = {}
self.llblock_map = {} self.phis = []
self.fixups = [] self.debug_info_emitter = DebugInfoEmitter(self.llmodule)
def llty_of_type(self, typ, bare=False, for_return=False): def llty_of_type(self, typ, bare=False, for_return=False):
typ = typ.find() typ = typ.find()
@ -200,6 +341,9 @@ class LLVMIRGenerator:
for func in functions: for func in functions:
self.process_function(func) self.process_function(func)
if any(functions):
self.debug_info_emitter.finalize(functions[0].loc.source_buffer)
return self.llmodule return self.llmodule
def process_function(self, func): def process_function(self, func):
@ -219,9 +363,10 @@ class LLVMIRGenerator:
self.llfunction.attributes.add('uwtable') self.llfunction.attributes.add('uwtable')
self.llmap = {}
self.llbuilder = ll.IRBuilder() self.llbuilder = ll.IRBuilder()
self.fixups = [] llblock_map = {}
disubprogram = self.debug_info_emitter.emit_subprogram(func, self.llfunction)
# First, map arguments. # First, map arguments.
for arg, llarg in zip(func.arguments, self.llfunction.args): for arg, llarg in zip(func.arguments, self.llfunction.args):
@ -240,27 +385,29 @@ class LLVMIRGenerator:
assert llinsn is not None assert llinsn is not None
self.llmap[insn] = llinsn self.llmap[insn] = llinsn
if insn.loc is not None:
diloc = self.debug_info_emitter.emit_loc(insn.loc, disubprogram)
llinsn.set_metadata('dbg', diloc)
# There is no 1:1 correspondence between ARTIQ and LLVM # There is no 1:1 correspondence between ARTIQ and LLVM
# basic blocks, because sometimes we expand a single ARTIQ # basic blocks, because sometimes we expand a single ARTIQ
# instruction so that the result spans several LLVM basic # instruction so that the result spans several LLVM basic
# blocks. This only really matters for phis, which will # blocks. This only really matters for phis, which will
# use a different map. # use a different map.
self.llblock_map[block] = self.llbuilder.basic_block llblock_map[block] = self.llbuilder.basic_block
# Fourth, fixup phis. # Fourth, add incoming values to phis.
for fixup in self.fixups: for phi, llphi in self.phis:
fixup() for value, block in phi.incoming():
llphi.add_incoming(self.map(value), llblock_map[block])
finally: finally:
self.llfunction = None self.llfunction = None
self.llmap = None self.llmap = {}
self.fixups = [] self.llphis = []
def process_Phi(self, insn): def process_Phi(self, insn):
llinsn = self.llbuilder.phi(self.llty_of_type(insn.type), name=insn.name) llinsn = self.llbuilder.phi(self.llty_of_type(insn.type), name=insn.name)
def fixup(): self.phis.append((insn, llinsn))
for value, block in insn.incoming():
llinsn.add_incoming(self.map(value), self.llblock_map[block])
self.fixups.append(fixup)
return llinsn return llinsn
def llindex(self, index): def llindex(self, index):
@ -793,8 +940,7 @@ class LLVMIRGenerator:
def process_LandingPad(self, insn): def process_LandingPad(self, insn):
# Layout on return from landing pad: {%_Unwind_Exception*, %Exception*} # Layout on return from landing pad: {%_Unwind_Exception*, %Exception*}
lllandingpadty = ll.LiteralStructType([llptr, lllandingpadty = ll.LiteralStructType([llptr, llptr])
llptr])
lllandingpad = self.llbuilder.landingpad(lllandingpadty, lllandingpad = self.llbuilder.landingpad(lllandingpadty,
self.llbuiltin("__artiq_personality"), self.llbuiltin("__artiq_personality"),
cleanup=True) cleanup=True)