TC-Y Code to Write

Tip

Information on ARM assembly instructions may be found in the ARM Architecture Reference Manual.

src/target/arm/arm-matcher.cc

target::arm::ArmMatcher is the functor used for instruction selection pattern-matching.

src/target/arm/arm-assembly.cc

ArmAssembly::cjump_build translates conditional branch instructions (branch if equal, if lower than, etc.) into ARM assembly.

Runtime

You have to complete the implementation of the runtime in src/target/arm/runtime.s:

strcmp

streq

Warning

Strings are implemented as 4 bytes to encode the length, and then a 0-terminated C-like string. You should rely on the initial encoded length, which is always present for compliance.

See the example below on how the string data is represented (l0):

hello-world-arm.tig

print("Hello Tiger!")

tc --target-arm --inst-display hello-world-arm.tig | head -n 6

$ tc --target-arm --inst-display hello-world-arm.tig | head -n 6
# Tiger final assembler ouput.

.data
l0:
	.word 12
	.asciz "Hello Tiger!"
$ echo $?
0

String data representation (assuming little endian)

Address (l0 +)	0x00	0x01	0x02	0x03	0x04	0x05	…	0x10
Value	0x00	0x00	0x00	0x0c	'H'	'e'	…	'\0'

---

src/target/arm/arm-codegen.cc (Optional)

Completing the Codegen::rewrite_program routine will be needed during register allocation only, see TC-9, Register Allocation.