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7157a84082
Summary: The value operand in DW_OP_plus_uconst/DW_OP_constu value can be large (it uses uint64_t as representation internally in LLVM). This means that in the uint64_t to int conversions, previously done by DwarfExpression::addMachineRegExpression, could lose information. Also, the negation done in "-Offset" was undefined behavior in case Offset was exactly INT_MIN. To avoid the above problems, we now avoid transformation like [Reg, DW_OP_plus_uconst, Offset] --> [DW_OP_breg, Offset] and [Reg, DW_OP_constu, Offset, DW_OP_plus] --> [DW_OP_breg, Offset] when Offset > INT_MAX. And we avoid to transform [Reg, DW_OP_constu, Offset, DW_OP_minus] --> [DW_OP_breg,-Offset] when Offset > INT_MAX+1. The patch also adjusts DwarfCompileUnit::constructVariableDIEImpl to make sure that "DW_OP_constu, Offset, DW_OP_minus" is used instead of "DW_OP_plus_uconst, Offset" when creating DIExpressions with negative frame index offsets. Notice that this might just be the tip of the iceberg. There are lots of fishy handling related to these constants. I think both DIExpression::appendOffset and DIExpression::extractIfOffset may trigger undefined behavior for certain values. Reviewers: sdesmalen, rnk, JDevlieghere Reviewed By: JDevlieghere Subscribers: jholewinski, aprantl, hiraditya, ychen, uabelho, llvm-commits Tags: #debug-info, #llvm Differential Revision: https://reviews.llvm.org/D67263 llvm-svn: 371304
260 lines
13 KiB
LLVM
260 lines
13 KiB
LLVM
; RUN: llc < %s -mtriple=nvptx64-nvidia-cuda | FileCheck %s
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; CHECK: .target sm_20, debug
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; CHECK: .visible .func use_dbg_declare()
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; CHECK: .local .align 8 .b8 __local_depot0[8];
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; CHECK: mov.u64 %SPL, __local_depot0;
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; CHECK: add.u64 %rd1, %SP, 0;
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; CHECK: .loc 1 5 3 // t.c:5:3
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; CHECK: { // callseq 0, 0
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; CHECK: .reg .b32 temp_param_reg;
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; CHECK: .param .b64 param0;
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; CHECK: st.param.b64 [param0+0], %rd1;
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; CHECK: call.uni
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; CHECK: escape_foo,
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; CHECK: (
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; CHECK: param0
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; CHECK: );
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; CHECK: } // callseq 0
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; CHECK: .loc 1 6 1 // t.c:6:1
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; CHECK: ret;
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; CHECK: }
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; CHECK: .file 1 "test{{(/|\\\\)}}t.c"
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; CHECK: .section .debug_abbrev
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; CHECK-NEXT: {
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; CHECK-NEXT: .b8 1 // Abbreviation Code
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; CHECK-NEXT: .b8 17 // DW_TAG_compile_unit
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; CHECK-NEXT: .b8 1 // DW_CHILDREN_yes
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; CHECK-NEXT: .b8 37 // DW_AT_producer
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 19 // DW_AT_language
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; CHECK-NEXT: .b8 5 // DW_FORM_data2
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; CHECK-NEXT: .b8 3 // DW_AT_name
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 16 // DW_AT_stmt_list
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; CHECK-NEXT: .b8 6 // DW_FORM_data4
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; CHECK-NEXT: .b8 27 // DW_AT_comp_dir
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 17 // DW_AT_low_pc
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; CHECK-NEXT: .b8 1 // DW_FORM_addr
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; CHECK-NEXT: .b8 18 // DW_AT_high_pc
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; CHECK-NEXT: .b8 1 // DW_FORM_addr
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; CHECK-NEXT: .b8 0 // EOM(1)
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; CHECK-NEXT: .b8 0 // EOM(2)
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; CHECK-NEXT: .b8 2 // Abbreviation Code
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; CHECK-NEXT: .b8 46 // DW_TAG_subprogram
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; CHECK-NEXT: .b8 1 // DW_CHILDREN_yes
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; CHECK-NEXT: .b8 17 // DW_AT_low_pc
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; CHECK-NEXT: .b8 1 // DW_FORM_addr
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; CHECK-NEXT: .b8 18 // DW_AT_high_pc
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; CHECK-NEXT: .b8 1 // DW_FORM_addr
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; CHECK-NEXT: .b8 64 // DW_AT_frame_base
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; CHECK-NEXT: .b8 10 // DW_FORM_block1
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; CHECK-NEXT: .b8 3 // DW_AT_name
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 58 // DW_AT_decl_file
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 59 // DW_AT_decl_line
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 39 // DW_AT_prototyped
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; CHECK-NEXT: .b8 12 // DW_FORM_flag
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; CHECK-NEXT: .b8 63 // DW_AT_external
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; CHECK-NEXT: .b8 12 // DW_FORM_flag
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; CHECK-NEXT: .b8 0 // EOM(1)
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; CHECK-NEXT: .b8 0 // EOM(2)
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; CHECK-NEXT: .b8 3 // Abbreviation Code
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; CHECK-NEXT: .b8 52 // DW_TAG_variable
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; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
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; CHECK-NEXT: .b8 51 // DW_AT_address_class
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 2 // DW_AT_location
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; CHECK-NEXT: .b8 10 // DW_FORM_block1
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; CHECK-NEXT: .b8 3 // DW_AT_name
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 58 // DW_AT_decl_file
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 59 // DW_AT_decl_line
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 73 // DW_AT_type
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; CHECK-NEXT: .b8 19 // DW_FORM_ref4
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; CHECK-NEXT: .b8 0 // EOM(1)
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; CHECK-NEXT: .b8 0 // EOM(2)
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; CHECK-NEXT: .b8 4 // Abbreviation Code
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; CHECK-NEXT: .b8 19 // DW_TAG_structure_type
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; CHECK-NEXT: .b8 1 // DW_CHILDREN_yes
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; CHECK-NEXT: .b8 3 // DW_AT_name
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 11 // DW_AT_byte_size
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 58 // DW_AT_decl_file
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 59 // DW_AT_decl_line
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 0 // EOM(1)
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; CHECK-NEXT: .b8 0 // EOM(2)
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; CHECK-NEXT: .b8 5 // Abbreviation Code
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; CHECK-NEXT: .b8 13 // DW_TAG_member
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; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
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; CHECK-NEXT: .b8 3 // DW_AT_name
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 73 // DW_AT_type
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; CHECK-NEXT: .b8 19 // DW_FORM_ref4
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; CHECK-NEXT: .b8 58 // DW_AT_decl_file
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 59 // DW_AT_decl_line
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 56 // DW_AT_data_member_location
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; CHECK-NEXT: .b8 10 // DW_FORM_block1
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; CHECK-NEXT: .b8 0 // EOM(1)
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; CHECK-NEXT: .b8 0 // EOM(2)
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; CHECK-NEXT: .b8 6 // Abbreviation Code
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; CHECK-NEXT: .b8 36 // DW_TAG_base_type
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; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
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; CHECK-NEXT: .b8 3 // DW_AT_name
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; CHECK-NEXT: .b8 8 // DW_FORM_string
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; CHECK-NEXT: .b8 62 // DW_AT_encoding
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 11 // DW_AT_byte_size
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; CHECK-NEXT: .b8 11 // DW_FORM_data1
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; CHECK-NEXT: .b8 0 // EOM(1)
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; CHECK-NEXT: .b8 0 // EOM(2)
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; CHECK-NEXT: .b8 0 // EOM(3)
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; CHECK-NEXT: }
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; CHECK-NEXT: .section .debug_info
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; CHECK-NEXT: {
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; CHECK-NEXT: .b32 134 // Length of Unit
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; CHECK-NEXT: .b8 2 // DWARF version number
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b32 .debug_abbrev // Offset Into Abbrev. Section
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; CHECK-NEXT: .b8 8 // Address Size (in bytes)
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; CHECK-NEXT: .b8 1 // Abbrev [1] 0xb:0x7f DW_TAG_compile_unit
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; CHECK-NEXT: .b8 99 // DW_AT_producer
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; CHECK-NEXT: .b8 108
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; CHECK-NEXT: .b8 97
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; CHECK-NEXT: .b8 110
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; CHECK-NEXT: .b8 103
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b8 12 // DW_AT_language
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b8 116 // DW_AT_name
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; CHECK-NEXT: .b8 46
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; CHECK-NEXT: .b8 99
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b32 .debug_line // DW_AT_stmt_list
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; CHECK-NEXT: .b8 116 // DW_AT_comp_dir
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; CHECK-NEXT: .b8 101
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; CHECK-NEXT: .b8 115
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; CHECK-NEXT: .b8 116
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b64 Lfunc_begin0 // DW_AT_low_pc
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; CHECK-NEXT: .b64 Lfunc_end0 // DW_AT_high_pc
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; CHECK-NEXT: .b8 2 // Abbrev [2] 0x31:0x3c DW_TAG_subprogram
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; CHECK-NEXT: .b64 Lfunc_begin0 // DW_AT_low_pc
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; CHECK-NEXT: .b64 Lfunc_end0 // DW_AT_high_pc
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; CHECK-NEXT: .b8 1 // DW_AT_frame_base
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; CHECK-NEXT: .b8 156
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; CHECK-NEXT: .b8 117 // DW_AT_name
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; CHECK-NEXT: .b8 115
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; CHECK-NEXT: .b8 101
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; CHECK-NEXT: .b8 95
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; CHECK-NEXT: .b8 100
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; CHECK-NEXT: .b8 98
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; CHECK-NEXT: .b8 103
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; CHECK-NEXT: .b8 95
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; CHECK-NEXT: .b8 100
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; CHECK-NEXT: .b8 101
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; CHECK-NEXT: .b8 99
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; CHECK-NEXT: .b8 108
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; CHECK-NEXT: .b8 97
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; CHECK-NEXT: .b8 114
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; CHECK-NEXT: .b8 101
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b8 1 // DW_AT_decl_file
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; CHECK-NEXT: .b8 3 // DW_AT_decl_line
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; CHECK-NEXT: .b8 1 // DW_AT_prototyped
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; CHECK-NEXT: .b8 1 // DW_AT_external
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; CHECK-NEXT: .b8 3 // Abbrev [3] 0x58:0x14 DW_TAG_variable
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; CHECK-NEXT: .b8 6 // DW_AT_address_class
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; CHECK-NEXT: .b8 9 // DW_AT_location
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; CHECK-NEXT: .b8 3
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; CHECK-NEXT: .b64 __local_depot0
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; CHECK-NEXT: .b8 111 // DW_AT_name
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b8 1 // DW_AT_decl_file
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; CHECK-NEXT: .b8 4 // DW_AT_decl_line
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; CHECK-NEXT: .b32 109 // DW_AT_type
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; CHECK-NEXT: .b8 0 // End Of Children Mark
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; CHECK-NEXT: .b8 4 // Abbrev [4] 0x6d:0x15 DW_TAG_structure_type
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; CHECK-NEXT: .b8 70 // DW_AT_name
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; CHECK-NEXT: .b8 111
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; CHECK-NEXT: .b8 111
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b8 4 // DW_AT_byte_size
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; CHECK-NEXT: .b8 1 // DW_AT_decl_file
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; CHECK-NEXT: .b8 1 // DW_AT_decl_line
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; CHECK-NEXT: .b8 5 // Abbrev [5] 0x75:0xc DW_TAG_member
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; CHECK-NEXT: .b8 120 // DW_AT_name
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b32 130 // DW_AT_type
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; CHECK-NEXT: .b8 1 // DW_AT_decl_file
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; CHECK-NEXT: .b8 1 // DW_AT_decl_line
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; CHECK-NEXT: .b8 2 // DW_AT_data_member_location
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; CHECK-NEXT: .b8 35
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b8 0 // End Of Children Mark
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; CHECK-NEXT: .b8 6 // Abbrev [6] 0x82:0x7 DW_TAG_base_type
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; CHECK-NEXT: .b8 105 // DW_AT_name
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; CHECK-NEXT: .b8 110
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; CHECK-NEXT: .b8 116
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; CHECK-NEXT: .b8 0
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; CHECK-NEXT: .b8 5 // DW_AT_encoding
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; CHECK-NEXT: .b8 4 // DW_AT_byte_size
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; CHECK-NEXT: .b8 0 // End Of Children Mark
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; CHECK-NEXT: }
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%struct.Foo = type { i32 }
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; Function Attrs: noinline nounwind uwtable
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define void @use_dbg_declare() #0 !dbg !7 {
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entry:
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%o = alloca %struct.Foo, align 4
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call void @llvm.dbg.declare(metadata %struct.Foo* %o, metadata !10, metadata !15), !dbg !16
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call void @escape_foo(%struct.Foo* %o), !dbg !17
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ret void, !dbg !18
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @escape_foo(%struct.Foo*)
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attributes #0 = { noinline nounwind uwtable }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "t.c", directory: "test")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 2}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang"}
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!7 = distinct !DISubprogram(name: "use_dbg_declare", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !DILocalVariable(name: "o", scope: !7, file: !1, line: 4, type: !11)
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!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, elements: !12)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !11, file: !1, line: 1, baseType: !14, size: 32)
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!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!15 = !DIExpression()
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!16 = !DILocation(line: 4, column: 14, scope: !7)
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!17 = !DILocation(line: 5, column: 3, scope: !7)
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!18 = !DILocation(line: 6, column: 1, scope: !7)
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