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WIP DWARF expression eval

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- fixup jump offsets after expression is serialized
- use generalized machine ops for register reads
- add option to limit number of executed opcodes
This commit is contained in:
Nikita Smith
2025-12-16 11:12:43 -08:00
parent 44123e9712
commit 2b4e0f8b77
6 changed files with 1338 additions and 1326 deletions
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src/dwarf/dwarf_expr.h
+33 -33
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@@ -7,14 +7,6 @@
////////////////////////////////
// evaluator
typedef struct DW_ExprContext
{
Arch arch;
DW_Format format;
U64 cfa;
U64 tls_base;
} DW_ExprContext;
#define DW_ExprValueType_IsSigned(x) ((x) == DW_ExprValueType_S8 || (x) == DW_ExprValueType_S16 || (x) == DW_ExprValueType_S32 || (x) == DW_ExprValueType_S64 || (x) == DW_ExprValueType_S128 || (x) == DW_ExprValueType_S256 || (x) == DW_ExprValueType_S512)
#define DW_ExprValueType_IsUnsigned(x) ((x) == DW_ExprValueType_U8 || (x) == DW_ExprValueType_U16 || (x) == DW_ExprValueType_U32 || (x) == DW_ExprValueType_U64 || (x) == DW_ExprValueType_U128 || (x) == DW_ExprValueType_U256 || (x) == DW_ExprValueType_U512)
#define DW_ExprValueType_IsFloat(x) ((x) == DW_ExprValueType_F32 || (x) == DW_ExprValueType_F64)
@@ -75,12 +67,6 @@ typedef struct DW_ExprValueNode
struct DW_ExprValueNode *next;
} DW_ExprValueNode;
typedef struct DW_ExprStack
{
U64 count;
DW_ExprValueNode *top;
} DW_ExprStack;
typedef enum
{
DW_PieceKind_Null,
@@ -113,11 +99,25 @@ typedef struct DW_PieceList
DW_PieceNode *last;
} DW_PieceList;
typedef struct DW_ExprStack
{
U64 count;
DW_ExprValueNode *top;
} DW_ExprStack;
typedef struct DW_ExprResult
{
int x;
} DW_ExprResult;
typedef enum
{
DW_ExprEvalResult_Fail,
DW_ExprEvalResult_Ok,
DW_ExprEvalResult_Maybe,
DW_ExprEvalResult_ExecOpLimitReached,
} DW_ExprEvalResult;
////////////////////////////////
// encoder
@@ -157,26 +157,26 @@ typedef struct DW_ExprEnc
S64 s64;
U64 addr;
String8 block;
char *label;
String8 label;
};
} DW_ExprEnc;
#define DW_ExprEnc_Op(v) { .type = DW_ExprEncType_Op, .op = DW_ExprOp_##v }
#define DW_ExprEnc_U8(v) { .type = DW_ExprEncType_U8, .u8 = v }
#define DW_ExprEnc_U16(v) { .type = DW_ExprEncType_U16, .u16 = v }
#define DW_ExprEnc_U32(v) { .type = DW_ExprEncType_U32, .u32 = v }
#define DW_ExprEnc_U64(v) { .type = DW_ExprEncType_U64, .u64 = v }
#define DW_ExprEnc_S8(v) { .type = DW_ExprEncType_S8, .s8 = v }
#define DW_ExprEnc_S16(v) { .type = DW_ExprEncType_S16, .s16 = v }
#define DW_ExprEnc_S32(v) { .type = DW_ExprEncType_S32, .s32 = v }
#define DW_ExprEnc_S64(v) { .type = DW_ExprEncType_S64, .s64 = v }
#define DW_ExprEnc_ULEB128(v) { .type = DW_ExprEncType_ULEB128, .u64 = v }
#define DW_ExprEnc_SLEB128(v) { .type = DW_ExprEncType_SLEB128, .s64 = v }
#define DW_ExprEnc_Addr(v) { .type = DW_ExprEncType_Addr, .addr = v }
#define DW_ExprEnc_Block(v) { .type = DW_ExprEncType_Block, .block = v }
#define DW_ExprEnc_UInt(v) { .type = DW_ExprEncType_DwarfUInt, .u64 = v }
#define DW_ExprEnc_Label(v) { .type = DW_ExprEncType_Label, .label = v }
#define DW_ExprEnc_DeclLabel(v) { .type = DW_ExprEncType_DeclLabel, .label = v }
#define DW_ExprEnc_Op(v) { .type = DW_ExprEncType_Op, .op = DW_ExprOp_##v }
#define DW_ExprEnc_U8(v) { .type = DW_ExprEncType_U8, .u8 = v }
#define DW_ExprEnc_U16(v) { .type = DW_ExprEncType_U16, .u16 = v }
#define DW_ExprEnc_U32(v) { .type = DW_ExprEncType_U32, .u32 = v }
#define DW_ExprEnc_U64(v) { .type = DW_ExprEncType_U64, .u64 = v }
#define DW_ExprEnc_S8(v) { .type = DW_ExprEncType_S8, .s8 = v }
#define DW_ExprEnc_S16(v) { .type = DW_ExprEncType_S16, .s16 = v }
#define DW_ExprEnc_S32(v) { .type = DW_ExprEncType_S32, .s32 = v }
#define DW_ExprEnc_S64(v) { .type = DW_ExprEncType_S64, .s64 = v }
#define DW_ExprEnc_ULEB128(v) { .type = DW_ExprEncType_ULEB128, .u64 = v }
#define DW_ExprEnc_SLEB128(v) { .type = DW_ExprEncType_SLEB128, .s64 = v }
#define DW_ExprEnc_Addr(v) { .type = DW_ExprEncType_Addr, .addr = v }
#define DW_ExprEnc_Block(v) { .type = DW_ExprEncType_Block, .block = v }
#define DW_ExprEnc_UInt(v) { .type = DW_ExprEncType_DwarfUInt, .u64 = v }
#define DW_ExprEnc_Label(v) { .type = DW_ExprEncType_Label, .label = str8_lit_comp(v) }
#define DW_ExprEnc_DeclLabel(v) { .type = DW_ExprEncType_DeclLabel, .label = str8_lit_comp(v) }
////////////////////////////////
@@ -235,10 +235,10 @@ internal DW_ExprValueNode * dw_expr_stack_pick(DW_ExprStack *stack, U64 idx);
internal String8 dw_string_from_expr_value(Arena *arena, U64 addr_size, DW_ExprValue v);
// evaluator
internal DW_UnwindStatus dw_eval_expr(Arena *arena, DW_ExprContext *ctx, DW_Expr expr, DW_RegRead *reg_read, void *reg_read_ud, DW_ExprValue *value_out);
internal DW_ExprEvalResult dw_eval_expr(Arena *arena, Arch arch, DW_Format format, U64 cfa, U64 tls_base, U64 op_limit, DW_Expr expr, MachineOp_RegRead *reg_read, void *reg_read_ud, DW_ExprValue *value_out);
// encoder
internal String8 dw_encode_expr(Arena *arena, DW_Format format, U64 addr_size, DW_ExprEnc *encs, U64 encs_count);
internal String8 dw_encode_expr(Arena *arena, Arch arch, DW_Format format, DW_ExprEnc *encs, U64 encs_count);
#endif //DWARF_EXPR_H