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add support for CFA in the eval system

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Canonical Frame Address is a DWARF-only concept encoded in the unwind info.
Debugger must store this data for each call frame and provide it to
the eval system based on selected stack frame.

To abstract over format details, we introduce a "Frame Unwind Context".
For DWARF, this context maintains the intermediate unwind state and exposes
the CFA, whereas for PE, it remains empty.
This commit is contained in:
Nikita Smith
2025-11-26 15:42:40 -08:00
parent 2a6d0d737c
commit f9561cb618
9 changed files with 225 additions and 100 deletions
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src/ctrl/ctrl_core.h
+14 -2
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@@ -248,6 +248,7 @@ typedef struct CTRL_UnwindFrame CTRL_UnwindFrame;
struct CTRL_UnwindFrame
{
void *regs;
U64 cfa;
};
typedef struct CTRL_UnwindFrameNode CTRL_UnwindFrameNode;
@@ -272,6 +273,15 @@ struct CTRL_Unwind
CTRL_UnwindFlags flags;
};
typedef struct CTRL_FrameUnwindContext CTRL_FrameUnwindContext;
struct CTRL_FrameUnwindContext
{
// DWARF
U64 cfa;
DW_CFI_Row *cfi_row;
U64 ret_addr_reg;
};
////////////////////////////////
//~ rjf: Call Stack Types
@@ -281,6 +291,7 @@ struct CTRL_CallStackFrame
U64 unwind_count;
U64 inline_depth;
void *regs;
U64 cfa;
};
typedef struct CTRL_CallStack CTRL_CallStack;
@@ -948,14 +959,15 @@ internal Arch ctrl_arch_from_process_handle(CTRL_Handle process_handle);
internal CTRL_Unwind ctrl_unwind_deep_copy(Arena *arena, Arch arch, CTRL_Unwind *src);
//- DWARF
internal CTRL_UnwindStepResult ctrl_unwind_step__dwarf(CTRL_Handle process_handle, CTRL_Handle module_handle, Arch arch, void *regs, U64 endt_us);
internal CTRL_UnwindStepResult ctrl_establish_frame_unwind_context__dwarf(Arena *arena, CTRL_Handle process_handle, CTRL_Handle module_handle, Arch arch, void *regs, U64 endt_us, CTRL_FrameUnwindContext *ctx_out);
internal CTRL_UnwindStepResult ctrl_unwind_step__dwarf(CTRL_Handle process_handle, CTRL_Handle module_handle, Arch arch, void *regs, CTRL_FrameUnwindContext *frame_ctx, U64 endt_us);
//- rjf: [x64]
internal REGS_Reg64 *ctrl_unwind_reg_from_pe_gpr_reg__pe_x64(REGS_RegBlockX64 *regs, PE_UnwindGprRegX64 gpr_reg);
internal CTRL_UnwindStepResult ctrl_unwind_step__pe_x64(CTRL_Handle process_handle, CTRL_Handle module_handle, U64 module_base_vaddr, REGS_RegBlockX64 *regs, U64 endt_us);
//- rjf: abstracted unwind step
internal CTRL_UnwindStepResult ctrl_unwind_step(CTRL_Handle process, CTRL_Handle module, U64 module_base_vaddr, Arch arch, void *reg_block, U64 endt_us);
internal CTRL_UnwindStepResult ctrl_unwind_step(CTRL_Handle process, CTRL_Handle module, U64 module_base_vaddr, Arch arch, void *reg_block, CTRL_FrameUnwindContext *frame_ctx, U64 endt_us);
//- rjf: abstracted full unwind
internal CTRL_Unwind ctrl_unwind_from_thread(Arena *arena, CTRL_EntityCtx *ctx, CTRL_Handle thread, U64 endt_us);