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variant.h (1240B)

      1 /* ARM32 backend variant descriptor — an immutable per-profile table threaded
      2  * through the otherwise stateless backend so a single backend can later serve
      3  * ARMv7-M and (future) ARMv6-M / A-profile variants. It is always reached
      4  * through a context (Arm32NativeTarget.variant) or arm32_variant_for_kind(),
      5  * never as ambient global state (CLAUDE.md: hang off a context struct).
      6  *
      7  * v1 ships exactly one variant: ARMv7-M Thumb-2, soft-float. */
      8 #ifndef KIT_ARCH_ARM32_VARIANT_H
      9 #define KIT_ARCH_ARM32_VARIANT_H
     10 
     11 #include "core/core.h"
     12 
     13 typedef struct Arm32Variant {
     14   KitArchKind kind;    /* KIT_ARCH_ARM_32 */
     15   const char* name;    /* "arm32" */
     16   const char* profile; /* "armv7-m" / (future) "armv7e-m" / "armv6-m" */
     17   u8 ptr_bytes;        /* 4 */
     18   u8 has_thumb2;       /* 1 on v7-M (32-bit Thumb-2, MOVW/MOVT, IT) */
     19   u8 has_idiv;         /* 1 on v7-M (hardware SDIV/UDIV) */
     20   u8 has_dsp;          /* 0 on v7-M, 1 on v7E-M (saturating/SIMD; follow-on) */
     21   u32 frame_save_size; /* saved lr + fp pair = 2 * ptr_bytes */
     22 } Arm32Variant;
     23 
     24 extern const Arm32Variant arm32_variant_v7m;
     25 
     26 /* Returns the variant for KIT_ARCH_ARM_32. v1 has a single variant. */
     27 const Arm32Variant* arm32_variant_for_kind(KitArchKind kind);
     28 
     29 #endif