From 9542deeb483a00b6fabed7574720926ce97d7511 Mon Sep 17 00:00:00 2001 From: Frederick Yin Date: Tue, 16 Aug 2022 11:54:23 +0800 Subject: Projects, 01-06 completed --- .../FunctionCalls/NestedCall/NestedCallStack.html | 306 +++++++++++++++++++++ 1 file changed, 306 insertions(+) create mode 100644 projects/08/FunctionCalls/NestedCall/NestedCallStack.html (limited to 'projects/08/FunctionCalls/NestedCall/NestedCallStack.html') diff --git a/projects/08/FunctionCalls/NestedCall/NestedCallStack.html b/projects/08/FunctionCalls/NestedCall/NestedCallStack.html new file mode 100644 index 0000000..70582b6 --- /dev/null +++ b/projects/08/FunctionCalls/NestedCall/NestedCallStack.html @@ -0,0 +1,306 @@ + + + + + NestedCall.tst — Stack Frames + + + + + + + +
+ + + + + + + + + + + +
Bootstrap init
Pointers
0256SP
1-1LCL
2-2ARG
3-3THIS
4-4THAT
Stack
256???←SP

+ This is how my boot­strap code initial­izes the pointers before calling Sys.init(). +

+ Setting the LCL, ARG, THIS and THAT point­ers to known illegal values helps identify + when a pointer is used before it is initial­ized. +

+ (If you are running the NestedCall test with­out boot­strap code, you will not see this state.)

+ 		+ + + + + + + + + + + + + + + + +
Entry to Sys.init()
Pointers
0261SP
1261LCL
2256ARG
3-3THIS
4-4THAT
Stack
256*Return IP←ARG
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261???←LCL, SP

+ This is how NestedCall.tst initial­izes the pointers and stack. This is what RAM looks + like after my boot­strap calls Sys.init(). +

+ (If your VM trans­lation includes the boot­strap, the -1 through -4 values may be + different if your boot­strap initial­izes them.)

+ 		+ + + + + + + + + + + + + + + + + + + + +
Entry to Sys.main()
Pointers
0266SP
1266LCL
2261ARG
34000THIS
45000THAT
Stack
256*Return IP
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261*Return IP←ARG
262261Saved LCL
263256Saved ARGSys.main
2644000Saved THIS frame
2655000Saved THAT
266???←LCL, SP
+ 		+ + + + + + + + + + + + + + + + + + + + + + + + + +
After Sys.main() prologue
Pointers
0271SP
1266LCL
2261ARG
34000THIS
45000THAT
Stack
256*Return IP
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261*Return IP←ARG
262261Saved LCL
263256Saved ARGSys.main
2644000Saved THIS frame
2655000Saved THAT
2660local 0←LCL
2670local 1
2680local 2
2690local 3
2700local 4
271???←SP

+ The function prologue is the assembly language code generated for the + "function" VM command. +
+ 		+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Entry to Sys.add12(123)
Pointers
0277SP
1277LCL
2271ARG
34001THIS
45001THAT
Stack
256*Return IP
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261*Return IP
262261Saved LCL
263256Saved ARGSys.main
2644000Saved THIS frame
2655000Saved THAT
2660local 0
267200local 1
26840local 2
2696local 3
2700local 4
271123argument 0←ARG
272*Return IP
273266Saved LCLSys.add12
274261Saved ARG frame
2754001Saved THIS
2765001Saved THAT
277???←LCL, SP
+
+ +

+ + + + +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Before Sys.add12() return
Pointers
0278SP
1277LCL
2271ARG
34002THIS
45002THAT
Stack
256*Return IP
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261*Return IP
262261Saved LCL
263256Saved ARGSys.main
2644000Saved THIS frame
2655000Saved THAT
2660local 0
267200local 1
26840local 2
2696local 3
2700local 4
271123argument 0←ARG
272*Return IP
273266Saved LCLSys.add12
274261Saved ARG frame
2754001Saved THIS
2765001Saved THAT
277135Return value←LCL
278???←SP
+ 		+ + + + + + + + + + + + + + + + + + + + + + + + + + +
After Sys.add12() return
Pointers
0272SP
1266LCL
2261ARG
34001THIS
45001THAT
Stack
256*Return IP
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261*Return IP←ARG
262261Saved LCL
263256Saved ARGSys.main
2644000Saved THIS frame
2655000Saved THAT
2660local 0←LCL
267200local 1
26840local 2
2696local 3
2700local 4
271135Return value
272???←SP
+ 		+ + + + + + + + + + + + + + + + + + + + + + + + + + +
Before Sys.main() return
Pointers
0272SP
1266LCL
2261ARG
34001THIS
45001THAT
Stack
256*Return IP
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261*Return IP←ARG
262261Saved LCL
263256Saved ARGSys.main
2644000Saved THIS frame
2655000Saved THAT
2660local 0←LCL
267200local 1
26840local 2
2696local 3
2700local 4
271246Return value
272???←SP
+ 		+ + + + + + + + + + + + + + + + +
After Sys.main() return
Pointers
0262SP
1261LCL
2256ARG
34000THIS
45000THAT
Stack
256*Return IP←ARG
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261246Return value←LCL
262???←SP
+ 		+ + + + + + + + + + + + + + + +
In Sys.init() halt loop
Pointers
0261SP
1261LCL
2256ARG
34000THIS
45000THAT
Stack
256*Return IP←ARG
257-1Saved LCL
258-2Saved ARGSys.init
259-3Saved THIS frame
260-4Saved THAT
261???←LCL, SP
+
+ + + \ No newline at end of file -- cgit v1.2.3