Add has_decompiler for arm32 platforms (#1741)

* Add has_decompiler for arm32 platforms

* Handle missing '.syntax unified' for gba

* allow fallback to default compiler if arch is supported

Author: mkst

backend/coreapp/decompiler_wrapper.py

@@ -30,6 +30,8 @@ def decompile(
             if len(asm.splitlines()) > MAX_M2C_ASM_LINES:
                 return "/* Too many lines to decompile; please run m2c manually */"
             try:
+                if platform.id == "gba" and "thumb_func_start" in asm:
+                    asm = f".syntax unified\n{asm}"
                 ret = M2CWrapper.decompile(asm, context, compiler, platform.arch)
             except M2CError as e:
                 # Attempt to decompile the source without context as a last-ditch effort

backend/coreapp/m2c_wrapper.py

@@ -33,8 +33,6 @@ def get_triple(compiler: Compiler, arch: str) -> str:
 
         if compiler.type != CompilerType.OTHER:
             triple += f"-{compiler.type.value}"
-        else:
-            raise M2CError(f"Unsupported compiler '{compiler}'")
 
         return triple
 

backend/coreapp/platforms.py

@@ -226,6 +226,7 @@ def from_id(platform_id: str) -> Platform:
     assemble_cmd='sed -i -e "s/;/;@/" "$INPUT" && arm-none-eabi-as -march=armv5te -mthumb -o "$OUTPUT" "$PRELUDE" "$INPUT"',
     objdump_cmd="arm-none-eabi-objdump",
     nm_cmd="arm-none-eabi-nm",
+    has_decompiler=True,
 )
 
 GBA = Platform(
@@ -236,6 +237,7 @@ def from_id(platform_id: str) -> Platform:
     assemble_cmd='sed -i -e "s/;/;@/" "$INPUT" && arm-none-eabi-as -mcpu=arm7tdmi -mthumb -o "$OUTPUT" "$PRELUDE" "$INPUT"',
     objdump_cmd="arm-none-eabi-objdump",
     nm_cmd="arm-none-eabi-nm",
+    has_decompiler=True,
 )
 
 N3DS = Platform(
@@ -246,6 +248,7 @@ def from_id(platform_id: str) -> Platform:
     assemble_cmd='sed -i -e "s/;/;@/" "$INPUT" && arm-none-eabi-as -mfpu=vfpv2 -march=armv6k -o "$OUTPUT" "$PRELUDE" "$INPUT"',
     objdump_cmd="arm-none-eabi-objdump",
     nm_cmd="arm-none-eabi-nm",
+    has_decompiler=True,
 )
 
 _platforms: OrderedDict[str, Platform] = OrderedDict(