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authorLeo Tenenbaum <pommicket@gmail.com>2021-11-20 11:38:34 -0500
committerLeo Tenenbaum <pommicket@gmail.com>2021-11-20 11:38:34 -0500
commitd74db670118dc4afdf9e6ecf01432aea4bc1ad39 (patch)
treea9123e53e6d874d7cc4fd3b1edd5d845708e4449 /04b/in03
parentdfd06106983d7a512f0e8aa3da2084f85f2261e5 (diff)
label definitions?
Diffstat (limited to '04b/in03')
-rw-r--r--04b/in0381
1 files changed, 75 insertions, 6 deletions
diff --git a/04b/in03 b/04b/in03
index 8b2da5b..62b9bfc 100644
--- a/04b/in03
+++ b/04b/in03
@@ -5,6 +5,11 @@ D=:global_variables
; initialize static_memory_end
C=:static_memory_end
D=x500000
+8C=D
+; initialize labels_end
+C=:labels_end
+D=:labels
+8C=D
I=8S
A=d3
@@ -104,6 +109,9 @@ D=1C
C=xa
?C=D:read_line
+C=':
+?C=D:handle_label_definition
+
I=:line
J=:"global"
C=x20
@@ -245,6 +253,49 @@ D=A
:mov_rbp_rsp
R=S
+:handle_label_definition
+ ; make sure label only has identifier characters
+ I=:line
+ I+=d1
+ :label_checking_loop
+ C=1I
+ D=xa
+ ?C=D:label_checking_loop_end
+ I+=d1
+ B=C
+ call :isident
+ D=A
+ ?D!0:label_checking_loop
+ !:bad_label
+ :label_checking_loop_end
+
+ ; @TODO: check if already exists
+
+ J=:labels_end
+ J=8J
+ I=:line
+ I+=d1
+ call :ident_copy
+ R=J
+
+ J=d4
+ I=d0
+ D=d1
+ syscall x8
+ C=A
+ C+=x400000
+ J=R
+ 4J=C
+ J+=d4
+
+ ; update labels_end
+ C=:labels_end
+ 8C=J
+
+ ; read the next line
+ !:read_line
+
+
:handle_return
; @TODO: handle argument
@@ -280,16 +331,15 @@ D=A
:ident_loop
C=1I
+ 1J=C
+ I+=d1
+ J+=d1
D=xa
?C=D:ident_loop_end
B=C
call :isident
D=A
?D=0:bad_identifier
- C=1I
- 1J=C
- I+=d1
- J+=d1
!:ident_loop
:ident_loop_end
return
@@ -397,6 +447,15 @@ D=A
str Bad identifier.
xa
x0
+
+:bad_label
+ B=:bad_label_error_message
+ !:program_error
+
+:bad_label_error_message
+ str Bad label.
+ xa
+ x0
:bad_type
B=:bad_type_error_message
@@ -577,7 +636,15 @@ D=A
J+=d1
D-=d1
!:memcpy
-
+
+; copy from rdi to rsi, until byte cl is reached
+:memccpy
+ D=1I
+ 1J=D
+ I+=d1
+ J+=d1
+ ?D!C:memccpy
+ return
:"char"
str char
@@ -623,13 +690,15 @@ align
reserve d8
:stack_end
reserve d8
+:labels_end
+ reserve d8
:line_number
reserve d8
:global_variables
reserve d50000
:local_variables
reserve d20000
-:label_table
+:labels
reserve d200000
:ELF_header