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When thinking about topics to review in preparation for 1. performing the research work and 2. writing the thesis, the following came to mind as potential chapters:
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Basic structure of a compiler, i.e. compiler phases
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Classes of grammars
Other items to consider:
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Adding the MiniJava BNF grammar as an appendix
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It seems that the ConcurrentMiniJava compiler is layed out such that each phase can stand alone. The parser is quite complex, but still modular. It contains JavaCC parser generator files to create parsers to
accept each previous phase of the compiler. No doubt, this is to assist students who are unable to complete a particular phase. I should know, I was one of those students :)
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According to the ARM Compiler toolchain: Using the Assembler reference document, the target ARM-based architecure has 30 general-purpose 32 bit registers. However, only the first 16 are
available in user-level mode. They are as follows:
| Register |
Name |
Purpose |
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R0
|
-
|
General Purpose / Return Value
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R1
|
-
|
General Purpose / Parameter
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R2
|
-
|
General Purpose / Parameter
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R3
|
-
|
General Purpose / Parameter
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|
R4
|
-
|
General Purpose
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|
R5
|
-
|
General Purpose
|
|
R6
|
-
|
General Purpose
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R7
|
-
|
General Purpose
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|
R8
|
-
|
General Purpose
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|
R9
|
-
|
General Purpose
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R10
|
-
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General Purpose
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R11
|
FP
|
Frame Pointer
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R12
|
IP
|
Intra Procedural Call
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R13
|
SP
|
Stack Pointer
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R14
|
LR
|
Link Register
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R15
|
PC
|
Program Counter
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CPSR
|
-
|
Current Program Status Register
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See this link for more info.
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Some basic Arm instructions seen in COSC 2200 assignments:
| Instruction |
Name |
Usage |
|
Arithmetic
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| add |
Add |
Add two integers |
| sub |
Subtract |
Subtract two integers |
| mul |
Multiply |
Multiply two integers |
| div |
Divide |
Divide two integers |
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Register Manipulation
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| ldr |
Load word |
Load a register with some value from a memory address |
| str |
Store word |
Store the value inside a given register into a memory address |
| mov |
Move |
Move an immediate value into a register |
| push |
Push |
Push a list of registers onto the Stack |
| pop |
Pop |
Pop a list of registers off of the Stack |
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Logical Operators
|
| cmp |
Compare |
Compare the contents of a register with some value |
| beq |
Branch if equals |
Branch to some label if the status register indicates the result of a cmp is equal |
| bgt |
Branch if greater than |
Branch to some label if the status register indicates the result of a cmp is greater than |
| blt |
Branch if less than |
Branch to some label if the status register indicates the result of a cmp is less than |
| bl |
Branch and link |
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| b |
Branch |
Branch to some label |
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Some realizations about the existing MIPS code is that in code emission, registers are given placeholder "template" values, which then later get resolved to real register values. I am still unsure how it will work when emitting code for a function. There will need to be some sort of push/pop handling.
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