Changed stack architecture to move downwards.
TikzPainter have been adjusted for the change. Stack limits are now shown.
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parent
e4ff1d4420
commit
9688172806
15
Emulator.py
15
Emulator.py
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@ -8,11 +8,13 @@ REGISTERS=["%rax", "%rbx", "%rcx", "%rdx", "%rsp", "%rbp", "%rsi", "%rdi",
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class Emulator:
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def __init__ (self, source_text):
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def __init__ (self, source_text, max_stack_size=1000):
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self.registers = {}
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for reg_name in REGISTERS:
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self.registers[reg_name] = "Junk"
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self.stack = {}
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for i in range(max_stack_size):
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self.stack[i] = 0
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self.code = []
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self.labels = {}
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self.changes = {}
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@ -28,12 +30,13 @@ class Emulator:
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Sets various stack elements, starting from 0 and going up.
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Automatically sets rsp. This can be disabled by passing set_rsp=False.
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"""
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i = -1
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i = len(self.stack)
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for element in stack_list:
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i += 1
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i -= 1
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self.stack[i] = element
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if (not 'set_rsp' in kwargs) or kwargs['set_rsp']:
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self.setRegs(rsp=i)
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self.last_sp = i-1
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def setRegs (self, **reg_dict):
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for reg_name, reg_val in reg_dict.iteritems():
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@ -82,15 +85,15 @@ class Emulator:
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return [ "\\"+token if token[0]=="$" or token[0]=="%" else token for token in self.code[line_nr] ]
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def pushToStack (self, new_element):
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self.registers['%rsp'] = self.registers['%rsp'] + 1
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self.registers['%rsp'] -= 1
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self.stack[self.registers['%rsp']] = new_element
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self.changedRegisters(('%rsp',"change"), ("m"+str(self.registers['%rsp']),"insert"))
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self.max_stack_size = max(self.registers['%rsp'], self.max_stack_size)
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def popFromStack (self):
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temp = self.stack[self.registers['%rsp']]
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self.registers['%rsp'] -= 1
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self.changedRegisters(('%rsp',"change"),("m"+str(self.registers['%rsp']+1),"remove"))
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self.changedRegisters(('%rsp',"change"),("m"+str(self.registers['%rsp']),"remove"))
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self.registers['%rsp'] += 1
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return temp
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def iterate (self):
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@ -9,11 +9,12 @@ REG_STATUS_TO_COLOR = {
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class TikzPainter:
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def __init__ (self, registers=None, max_stack_size=8):
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def __init__ (self, registers=None, max_stack_size=8, stack_draw_mode="up"):
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self.registers = registers if registers else REGISTERS
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self.text = []
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self.pos_x = 0
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self.max_stack_size = max_stack_size
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self.stack_draw_mode = stack_draw_mode
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def addText (self, str, *args):
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self.text.append(str.format(*args))
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@ -21,6 +22,33 @@ class TikzPainter:
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def getRegColor (self, reg_state):
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return REG_STATUS_TO_COLOR[reg_state]
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def drawStackUpward (self, pos, emu, x):
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base_pointer = emu.getVal('%rbp')
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pos -= 1.5
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base_sp = min(emu.last_sp, emu.getVal('%rsp'))
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pos += 0.5 * max(0, emu.getVal('%rsp')-emu.last_sp)
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for index in range(base_sp, 3+min(emu.max_stack_size, emu.getVal('%rsp')+self.max_stack_size)):
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reg_state = emu.regState("m"+str(index))
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reg_dect = "register_node, fill="+self.getRegColor(reg_state)+"!10"
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self.addText("\t\\node[{}]() at ({}, {}){{{}}};\n",
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reg_dect, x, pos, emu.stack[index])
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if base_pointer == index:
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self.addText("\t\\draw ({0},{2}) -- ({1},{2});\n",x-1.1,x+1.1,pos-0.25)
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base_pointer = emu.stack[base_pointer]
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pos -= 0.5
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return pos, x
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def drawStackDownward (self, pos, emu, x):
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pos -= 1
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for index in range(emu.getVal('%rsp')-8, max(emu.last_sp, emu.getVal('%rsp'))):
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reg_state = emu.regState("m"+str(index))
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reg_dect = "register_node, fill="+self.getRegColor(reg_state)+"!10"
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self.addText("\t\\node[{}]() at ({}, {}){{{}}};\n",
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reg_dect, x, pos, emu.stack[index])
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pos -= 0.5
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return pos, x
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def drawState (self, emu, line_nr=None):
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x = (self.pos_x+1)*2.5-0.5
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self.pos_x += 1
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@ -37,16 +65,10 @@ class TikzPainter:
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reg_dect, x, pos, emu.getVal(reg_name))
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# Draw stack
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pos -= 1.5
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base_sp = max(emu.last_sp, emu.getVal('%rsp'))
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if emu.last_sp - 1 == emu.getVal('%rsp'):
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pos += 0.5
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for index in range(base_sp, max(-1, base_sp-self.max_stack_size),-1):
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reg_state = emu.regState("m"+str(index))
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reg_dect = "register_node, fill="+self.getRegColor(reg_state)+"!10"
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self.addText("\t\\node[{}]() at ({}, {}){{{}}};\n",
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reg_dect, x, pos, emu.stack[index])
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pos -= 0.5
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if self.stack_draw_mode == "up":
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pos, x = self.drawStackUpward(pos, emu, x)
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else:
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pos, x = self.drawStackDownward(pos, emu, x)
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# Draw line signature
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if line_nr == None:
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@ -54,22 +76,34 @@ class TikzPainter:
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pos = 2
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signature = emu.getLineSignature(line_nr)
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for token in signature:
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self.addText("\t\\node[text_node]() at ({}, {}){{{}}};\n", x-1.25, pos, token)
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self.addText("\t\\node[text_node]() at ({}, {}){{{}}};\n",
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x-1.25, pos, token)
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pos -= 0.5
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def drawNames (self, emu):
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x = 0
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pos = 0
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for reg_name in self.registers:
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self.addText("\t\\node[text_node]() at ({}, {}){{{}}};\n", x, pos, reg_name[1:])
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self.addText("\t\\node[text_node]() at ({}, {}){{{}}};\n",
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x, pos, reg_name[1:])
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pos -= 0.5
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self.addText("\t\\node[text_node]() at ({}, {}){{TOS+1}};\n", x, pos-0.5)
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self.addText("\t\\node[text_node]() at ({}, {}){{TOS}};\n", x, pos-1.0)
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# Draw stack
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if self.stack_draw_mode == "up":
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self.drawStackNamesUpward(pos, emu, x)
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else:
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self.drawStackNamesDownward(pos, emu, x)
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def drawStackNamesUpward (self, pos, emu, x):
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self.addText("\t\\node[text_node]() at ({}, {}){{TOS+1}};\n",
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x, pos-0.5)
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self.addText("\t\\node[text_node]() at ({}, {}){{TOS}};\n",
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x, pos-1.0)
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pos -= 1
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for index in range(1,self.max_stack_size):
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pos -= 0.5
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self.addText("\t\\node[text_node]() at ({}, {}){{TOS-{}}};\n", x, pos, index)
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self.addText("\t\\node[text_node]() at ({}, {}){{TOS-{}}};\n",
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x, pos, index)
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def __str__ (self):
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return "".join(self.text)
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@ -49,8 +49,8 @@ return: leave # Clean up
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OPTIONS = """register_node/.style={rectangle, draw=black!30,
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fill=black!5, very thick, minimum size=0.5, minimum width=20mm},
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text_node/.style={}"""
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fill=black!5, very thick, minimum size=0.5,
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minimum width=20mm}, text_node/.style={}"""
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def printf (str, *args):
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print(str.format(*args))
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