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# Copyright (C) 2011 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.
require "ast"
require "instructions"
require "pathname"
require "registers"
require "self_hash"
class CodeOrigin
attr_reader :fileName, :lineNumber
def initialize(fileName, lineNumber)
@fileName = fileName
@lineNumber = lineNumber
end
def to_s
"#{fileName}:#{lineNumber}"
end
end
class Token
attr_reader :codeOrigin, :string
def initialize(codeOrigin, string)
@codeOrigin = codeOrigin
@string = string
end
def ==(other)
if other.is_a? Token
@string == other.string
else
@string == other
end
end
def =~(other)
@string =~ other
end
def to_s
"#{@string.inspect} at #{codeOrigin}"
end
def parseError(*comment)
if comment.empty?
raise "Parse error: #{to_s}"
else
raise "Parse error: #{to_s}: #{comment[0]}"
end
end
end
#
# The lexer. Takes a string and returns an array of tokens.
#
def lex(str, fileName)
fileName = Pathname.new(fileName)
result = []
lineNumber = 1
while not str.empty?
case str
when /\A\#([^\n]*)/
# comment, ignore
when /\A\n/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&)
lineNumber += 1
when /\A[a-zA-Z]([a-zA-Z0-9_]*)/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&)
when /\A\.([a-zA-Z0-9_]*)/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&)
when /\A_([a-zA-Z0-9_]*)/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&)
when /\A([ \t]+)/
# whitespace, ignore
when /\A0x([0-9a-fA-F]+)/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&.hex.to_s)
when /\A0([0-7]+)/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&.oct.to_s)
when /\A([0-9]+)/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&)
when /\A::/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&)
when /\A[:,\(\)\[\]=\+\-~\|&^*]/
result << Token.new(CodeOrigin.new(fileName, lineNumber), $&)
else
raise "Lexer error at #{CodeOrigin.new(fileName, lineNumber).to_s}, unexpected sequence #{str[0..20].inspect}"
end
str = $~.post_match
end
result
end
#
# Token identification.
#
def isRegister(token)
token =~ REGISTER_PATTERN
end
def isInstruction(token)
token =~ INSTRUCTION_PATTERN
end
def isKeyword(token)
token =~ /\A((true)|(false)|(if)|(then)|(else)|(elsif)|(end)|(and)|(or)|(not)|(macro)|(const)|(sizeof)|(error)|(include))\Z/ or
token =~ REGISTER_PATTERN or
token =~ INSTRUCTION_PATTERN
end
def isIdentifier(token)
token =~ /\A[a-zA-Z]([a-zA-Z0-9_]*)\Z/ and not isKeyword(token)
end
def isLabel(token)
token =~ /\A_([a-zA-Z0-9_]*)\Z/
end
def isLocalLabel(token)
token =~ /\A\.([a-zA-Z0-9_]*)\Z/
end
def isVariable(token)
isIdentifier(token) or isRegister(token)
end
def isInteger(token)
token =~ /\A[0-9]/
end
#
# The parser. Takes an array of tokens and returns an AST. Methods
# other than parse(tokens) are not for public consumption.
#
class Parser
def initialize(data, fileName)
@tokens = lex(data, fileName)
@idx = 0
end
def parseError(*comment)
if @tokens[@idx]
@tokens[@idx].parseError(*comment)
else
if comment.empty?
raise "Parse error at end of file"
else
raise "Parse error at end of file: #{comment[0]}"
end
end
end
def consume(regexp)
if regexp
parseError unless @tokens[@idx] =~ regexp
else
parseError unless @idx == @tokens.length
end
@idx += 1
end
def skipNewLine
while @tokens[@idx] == "\n"
@idx += 1
end
end
def parsePredicateAtom
if @tokens[@idx] == "not"
@idx += 1
parsePredicateAtom
elsif @tokens[@idx] == "("
@idx += 1
skipNewLine
result = parsePredicate
parseError unless @tokens[@idx] == ")"
@idx += 1
result
elsif @tokens[@idx] == "true"
result = True.instance
@idx += 1
result
elsif @tokens[@idx] == "false"
result = False.instance
@idx += 1
result
elsif isIdentifier @tokens[@idx]
result = Setting.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string)
@idx += 1
result
else
parseError
end
end
def parsePredicateAnd
result = parsePredicateAtom
while @tokens[@idx] == "and"
codeOrigin = @tokens[@idx].codeOrigin
@idx += 1
skipNewLine
right = parsePredicateAtom
result = And.new(codeOrigin, result, right)
end
result
end
def parsePredicate
# some examples of precedence:
# not a and b -> (not a) and b
# a and b or c -> (a and b) or c
# a or b and c -> a or (b and c)
result = parsePredicateAnd
while @tokens[@idx] == "or"
codeOrigin = @tokens[@idx].codeOrigin
@idx += 1
skipNewLine
right = parsePredicateAnd
result = Or.new(codeOrigin, result, right)
end
result
end
def parseVariable
if isRegister(@tokens[@idx])
if @tokens[@idx] =~ FPR_PATTERN
result = FPRegisterID.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string)
else
result = RegisterID.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string)
end
elsif isIdentifier(@tokens[@idx])
result = Variable.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string)
else
parseError
end
@idx += 1
result
end
def parseAddress(offset)
parseError unless @tokens[@idx] == "["
codeOrigin = @tokens[@idx].codeOrigin
# Three possibilities:
# [] -> AbsoluteAddress
# [a] -> Address
# [a,b] -> BaseIndex with scale = 1
# [a,b,c] -> BaseIndex
@idx += 1
if @tokens[@idx] == "]"
@idx += 1
return AbsoluteAddress.new(codeOrigin, offset)
end
a = parseVariable
if @tokens[@idx] == "]"
result = Address.new(codeOrigin, a, offset)
else
parseError unless @tokens[@idx] == ","
@idx += 1
b = parseVariable
if @tokens[@idx] == "]"
result = BaseIndex.new(codeOrigin, a, b, 1, offset)
else
parseError unless @tokens[@idx] == ","
@idx += 1
parseError unless ["1", "2", "4", "8"].member? @tokens[@idx].string
c = @tokens[@idx].string.to_i
@idx += 1
parseError unless @tokens[@idx] == "]"
result = BaseIndex.new(codeOrigin, a, b, c, offset)
end
end
@idx += 1
result
end
def parseColonColon
skipNewLine
codeOrigin = @tokens[@idx].codeOrigin
parseError unless isIdentifier @tokens[@idx]
names = [@tokens[@idx].string]
@idx += 1
while @tokens[@idx] == "::"
@idx += 1
parseError unless isIdentifier @tokens[@idx]
names << @tokens[@idx].string
@idx += 1
end
raise if names.empty?
[codeOrigin, names]
end
def parseExpressionAtom
skipNewLine
if @tokens[@idx] == "-"
@idx += 1
NegImmediate.new(@tokens[@idx - 1].codeOrigin, parseExpressionAtom)
elsif @tokens[@idx] == "~"
@idx += 1
BitnotImmediate.new(@tokens[@idx - 1].codeOrigin, parseExpressionAtom)
elsif @tokens[@idx] == "("
@idx += 1
result = parseExpression
parseError unless @tokens[@idx] == ")"
@idx += 1
result
elsif isInteger @tokens[@idx]
result = Immediate.new(@tokens[@idx].codeOrigin, @tokens[@idx].string.to_i)
@idx += 1
result
elsif isIdentifier @tokens[@idx]
codeOrigin, names = parseColonColon
if names.size > 1
StructOffset.forField(codeOrigin, names[0..-2].join('::'), names[-1])
else
Variable.forName(codeOrigin, names[0])
end
elsif isRegister @tokens[@idx]
parseVariable
elsif @tokens[@idx] == "sizeof"
@idx += 1
codeOrigin, names = parseColonColon
Sizeof.forName(codeOrigin, names.join('::'))
else
parseError
end
end
def parseExpressionMul
skipNewLine
result = parseExpressionAtom
while @tokens[@idx] == "*"
if @tokens[@idx] == "*"
@idx += 1
result = MulImmediates.new(@tokens[@idx - 1].codeOrigin, result, parseExpressionAtom)
else
raise
end
end
result
end
def couldBeExpression
@tokens[@idx] == "-" or @tokens[@idx] == "~" or @tokens[@idx] == "sizeof" or isInteger(@tokens[@idx]) or isVariable(@tokens[@idx]) or @tokens[@idx] == "("
end
def parseExpressionAdd
skipNewLine
result = parseExpressionMul
while @tokens[@idx] == "+" or @tokens[@idx] == "-"
if @tokens[@idx] == "+"
@idx += 1
result = AddImmediates.new(@tokens[@idx - 1].codeOrigin, result, parseExpressionMul)
elsif @tokens[@idx] == "-"
@idx += 1
result = SubImmediates.new(@tokens[@idx - 1].codeOrigin, result, parseExpressionMul)
else
raise
end
end
result
end
def parseExpressionAnd
skipNewLine
result = parseExpressionAdd
while @tokens[@idx] == "&"
@idx += 1
result = AndImmediates.new(@tokens[@idx - 1].codeOrigin, result, parseExpressionAdd)
end
result
end
def parseExpression
skipNewLine
result = parseExpressionAnd
while @tokens[@idx] == "|" or @tokens[@idx] == "^"
if @tokens[@idx] == "|"
@idx += 1
result = OrImmediates.new(@tokens[@idx - 1].codeOrigin, result, parseExpressionAnd)
elsif @tokens[@idx] == "^"
@idx += 1
result = XorImmediates.new(@tokens[@idx - 1].codeOrigin, result, parseExpressionAnd)
else
raise
end
end
result
end
def parseOperand(comment)
skipNewLine
if couldBeExpression
expr = parseExpression
if @tokens[@idx] == "["
parseAddress(expr)
else
expr
end
elsif @tokens[@idx] == "["
parseAddress(Immediate.new(@tokens[@idx].codeOrigin, 0))
elsif isLabel @tokens[@idx]
result = LabelReference.new(@tokens[@idx].codeOrigin, Label.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string))
@idx += 1
result
elsif isLocalLabel @tokens[@idx]
result = LocalLabelReference.new(@tokens[@idx].codeOrigin, LocalLabel.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string))
@idx += 1
result
else
parseError(comment)
end
end
def parseMacroVariables
skipNewLine
consume(/\A\(\Z/)
variables = []
loop {
skipNewLine
if @tokens[@idx] == ")"
@idx += 1
break
elsif isIdentifier(@tokens[@idx])
variables << Variable.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string)
@idx += 1
skipNewLine
if @tokens[@idx] == ")"
@idx += 1
break
elsif @tokens[@idx] == ","
@idx += 1
else
parseError
end
else
parseError
end
}
variables
end
def parseSequence(final, comment)
firstCodeOrigin = @tokens[@idx].codeOrigin
list = []
loop {
if (@idx == @tokens.length and not final) or (final and @tokens[@idx] =~ final)
break
elsif @tokens[@idx] == "\n"
# ignore
@idx += 1
elsif @tokens[@idx] == "const"
@idx += 1
parseError unless isVariable @tokens[@idx]
variable = Variable.forName(@tokens[@idx].codeOrigin, @tokens[@idx].string)
@idx += 1
parseError unless @tokens[@idx] == "="
@idx += 1
value = parseOperand("while inside of const #{variable.name}")
list << ConstDecl.new(@tokens[@idx].codeOrigin, variable, value)
elsif @tokens[@idx] == "error"
list << Error.new(@tokens[@idx].codeOrigin)
@idx += 1
elsif @tokens[@idx] == "if"
codeOrigin = @tokens[@idx].codeOrigin
@idx += 1
skipNewLine
predicate = parsePredicate
consume(/\A((then)|(\n))\Z/)
skipNewLine
ifThenElse = IfThenElse.new(codeOrigin, predicate, parseSequence(/\A((else)|(end)|(elsif))\Z/, "while inside of \"if #{predicate.dump}\""))
list << ifThenElse
while @tokens[@idx] == "elsif"
codeOrigin = @tokens[@idx].codeOrigin
@idx += 1
skipNewLine
predicate = parsePredicate
consume(/\A((then)|(\n))\Z/)
skipNewLine
elseCase = IfThenElse.new(codeOrigin, predicate, parseSequence(/\A((else)|(end)|(elsif))\Z/, "while inside of \"if #{predicate.dump}\""))
ifThenElse.elseCase = elseCase
ifThenElse = elseCase
end
if @tokens[@idx] == "else"
@idx += 1
ifThenElse.elseCase = parseSequence(/\Aend\Z/, "while inside of else case for \"if #{predicate.dump}\"")
@idx += 1
else
parseError unless @tokens[@idx] == "end"
@idx += 1
end
elsif @tokens[@idx] == "macro"
codeOrigin = @tokens[@idx].codeOrigin
@idx += 1
skipNewLine
parseError unless isIdentifier(@tokens[@idx])
name = @tokens[@idx].string
@idx += 1
variables = parseMacroVariables
body = parseSequence(/\Aend\Z/, "while inside of macro #{name}")
@idx += 1
list << Macro.new(codeOrigin, name, variables, body)
elsif isInstruction @tokens[@idx]
codeOrigin = @tokens[@idx].codeOrigin
name = @tokens[@idx].string
@idx += 1
if (not final and @idx == @tokens.size) or (final and @tokens[@idx] =~ final)
# Zero operand instruction, and it's the last one.
list << Instruction.new(codeOrigin, name, [])
break
elsif @tokens[@idx] == "\n"
# Zero operand instruction.
list << Instruction.new(codeOrigin, name, [])
@idx += 1
else
# It's definitely an instruction, and it has at least one operand.
operands = []
endOfSequence = false
loop {
operands << parseOperand("while inside of instruction #{name}")
if (not final and @idx == @tokens.size) or (final and @tokens[@idx] =~ final)
# The end of the instruction and of the sequence.
endOfSequence = true
break
elsif @tokens[@idx] == ","
# Has another operand.
@idx += 1
elsif @tokens[@idx] == "\n"
# The end of the instruction.
@idx += 1
break
else
parseError("Expected a comma, newline, or #{final} after #{operands.last.dump}")
end
}
list << Instruction.new(codeOrigin, name, operands)
if endOfSequence
break
end
end
elsif isIdentifier @tokens[@idx]
codeOrigin = @tokens[@idx].codeOrigin
name = @tokens[@idx].string
@idx += 1
if @tokens[@idx] == "("
# Macro invocation.
@idx += 1
operands = []
skipNewLine
if @tokens[@idx] == ")"
@idx += 1
else
loop {
skipNewLine
if @tokens[@idx] == "macro"
# It's a macro lambda!
codeOriginInner = @tokens[@idx].codeOrigin
@idx += 1
variables = parseMacroVariables
body = parseSequence(/\Aend\Z/, "while inside of anonymous macro passed as argument to #{name}")
@idx += 1
operands << Macro.new(codeOriginInner, nil, variables, body)
else
operands << parseOperand("while inside of macro call to #{name}")
end
skipNewLine
if @tokens[@idx] == ")"
@idx += 1
break
elsif @tokens[@idx] == ","
@idx += 1
else
parseError "Unexpected #{@tokens[@idx].string.inspect} while parsing invocation of macro #{name}"
end
}
end
list << MacroCall.new(codeOrigin, name, operands)
else
parseError "Expected \"(\" after #{name}"
end
elsif isLabel @tokens[@idx] or isLocalLabel @tokens[@idx]
codeOrigin = @tokens[@idx].codeOrigin
name = @tokens[@idx].string
@idx += 1
parseError unless @tokens[@idx] == ":"
# It's a label.
if isLabel name
list << Label.forName(codeOrigin, name)
else
list << LocalLabel.forName(codeOrigin, name)
end
@idx += 1
elsif @tokens[@idx] == "include"
@idx += 1
parseError unless isIdentifier(@tokens[@idx])
moduleName = @tokens[@idx].string
fileName = @tokens[@idx].codeOrigin.fileName.dirname + (moduleName + ".asm")
@idx += 1
$stderr.puts "offlineasm: Including file #{fileName}"
list << parse(fileName)
else
parseError "Expecting terminal #{final} #{comment}"
end
}
Sequence.new(firstCodeOrigin, list)
end
end
def parseData(data, fileName)
parser = Parser.new(data, fileName)
parser.parseSequence(nil, "")
end
def parse(fileName)
parseData(IO::read(fileName), fileName)
end
def parseHash(fileName)
dirHash(Pathname.new(fileName).dirname, /\.asm$/)
end