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declare variable sizes in bytes, and stop trampling other vars in memory.

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Sami Samhuri 2010-01-20 23:20:33 -08:00
parent 7ee7b8ec48
commit 90bcdbf659
1 changed files with 9 additions and 6 deletions
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15
compiler.rb
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@ -581,7 +581,7 @@ class Compiler
digits = if asm.var?(d)
asm.var(d)
else
d_var = asm.defvar(d, 4)
d_var = asm.defvar(d, 16)
asm.block do
# define a lookup table of digits
mov([d_var], 0x33323130)
@ -592,15 +592,18 @@ class Compiler
d_var
end
# 3 dwords == 12 chars
hex = asm.var!(h, 3)
# 12 bytes: 2 for "0x", 8 hex digits, 2 for newline + null terminator
hex = asm.var!(h, 12)
asm.block do
# TODO check sign and prepend '-' if negative
mov([hex], 0x7830) # "0x" == [48, 120]
mov([hex+10], 0xa) # newline + null terminator
mov([hex], 0x7830) # "0x" ==> 48, 120
mov([hex+4], 0) # zero the rest
mov([hex+8], 0)
mov([:byte, hex+10], 0xa) # newline
mov([:byte, hex+11], 0) # null terminator
end
boolean_expression
boolean_expression # result in EAX
asm.block do
# convert eax to a hex string
lea(ESI, [digits])