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+# Blocs d'activation
+## Memory Hierarchy
+
+| Type         | Desc                                |
+| ------------ | ----------------------------------- |
+| Registers    | Small memory units built on the CPU |
+| L1           | Last main memory access results     |
+| L2           | MB                                  |
+| Memory (RAM) | RAM                                 |
+| Storage      | Disks                               |
+
+## Register overflow
+**Memory allocation must be dynamic**
+### Dynamic memory allocation
+- *Global*
+- *Automatic*
+- *Heap*:
+	- User controlled
+	- Garbage collected
+## `spim` Memory model
+![[Pasted image 20250513142247.png]]
+
+## Stack management
+Function calls: stack process
+Or: Call Tree dfs
+
+## Activation blocks contents
+- arguments : incoming
+- local variables : user automatic variables
+- return address : where to return
+- saved registers : caller's environment to restore
+- temp : compiler automatic variables, spills
+- static links : when needed
+Layout suggested by the constructor
+
+## Frame & stack pointer
+Frame : debut de bloc
+Stack : fin de bloc
+
+# Static links
+A mechanism :
+- Computed at compile time
+- that produces code
+- that will be used at runtime
+$\rightarrow$ Sert à remonter au premier lien avant les appels recursifs pour chopper des variables
+
+# Translating expressions
+How to translate the expression $\alpha < \beta$ in HIR?
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